Linear Technology DC1668A-C Quick setup guide

1
dc1668acf
DEMO MANUAL DC1668A-C
DESCRIPTION
LTM4627EV High Efficiency
50A PolyPhase Step-Down
Power Supply
BOARD PHOTO
Demonstration circuit 1668A-C is a PolyPhase
®
power
supply featuring four LTM
®
4627 high efficiency synchro-
nous buck µModule
®
regulators. The DC1668A-C input
voltage range is between 4.5V to 20V with a jumper pro-
grammable output voltage from 0.6V to 3.3V. The demo
circuit can deliver up to 50A of load with excellent current
sharing. Current derating may be necessary under certain
operating conditions.
The LTM4627 can be synchronized to an external clock be-
tween 250kHz to 770kHz. The default switching frequency
for the DC1668A-C is set to 500kHz through the onboard
LTC6902 clock generator. The external clock interleaves
the paralleled phases to minimize input and output ripple.
DC1668A-C demonstrates that paralleling LTM4627 mod-
ules is easy and reliable. These features and the availability
of the LTM4627 in a compact thermally enhanced 15mm ×
15mm × 4.32mm LGA package make the circuit ideal for
use in high density point of load regulation applications.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, PolyPhase, µModule and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.

2
dc1668acf
DEMO MANUAL DC1668A-C
PARAMETER CONDITION VALUE
Input Voltage Range 4.5V to 20V
Output Voltage VOUT Remove VOUT SEL Jumper for VOUT = 0.6VDC 0.6VDC, 1VDC, 1.2VDC, 1.5VDC, 1.8VDC,
2.5VDC, 3.3VDC
Maximum Continuous Output Current IOUT(MAX) Current Derating May Be Necessary for Certain VIN,
VOUT, Frequency and Thermal Conditions.
50ADC
Default Operating Frequency 500kHz
External Clock Synchronous Frequency Range 250kHz to 770kHz
Output Voltage Ripple (Typical) VIN = 12V, VOUT = 1.8V
500kHz (20MHz BW)
< 10mVP-P at IOUT = 50A, See Figure 5
Efficiency VIN = 12V, VOUT = 1.8V
500kHz
87.7% at IOUT = 50A, See Figure 2
Load Transient VIN = 12V, VOUT = 1.8V See Figure 4
QUICK START PROCEDURE
PERFORMANCE SUMMARY
Demonstration circuit 1668A-C is easy to set up to evaluate
the performance of paralleled LTM4627 modules. Please
refer to Figure 1 for proper measurement equipment setup
and follow the procedure below:
1. With power off, connect the input power supply, load,
meters and VOUT BNC cable as shown in Figure 1.
Preset the load to 0A and VIN supply to be 0V. Place
jumpers in the following positions for a typical 1.8VOUT
application:
JP2 JP7 JP6
VOUT Select RUN TRACK/SS
1.8V OFF SOFT-START
2. Turn on the power at the input. Increase VIN to 12V
(Do not hot-plug the input supply or apply more than
the rated maximum voltage of 20V to the board or the
modules may be damaged).
3. Set the RUN pin jumper (JP7) to the ON position. The
output voltage should be regulated. The output voltage
meter should read 1.8V ±2% (1.76V to 1.84V).
4. Vary the input voltage from 5V to 20V and adjust the
load current from 0A to 50A. VOUT should remain
regulated at 1.8V ±2%. Observe the load regulation,
output voltage ripple, efficiency and other parameters.
Output voltage ripple should be measured at J6 with
a BNC cable and oscilloscope. The probe channel for
VOUT should be set at 50Ω termination resistance to
match the BNC cable.
5. For optional load transient testing apply an adjustable
positive pulse signal between IOSTEP CLK and GND
pins. The pulse amplitude sets the load step current
amplitude. The pulse width should be short (< 1ms)
and pulse duty cycle should be low (< 15%) to limit the
thermal stress on the load transient circuit. The load
step current can be monitored with a BNC connected
to J5 (5mV/A).

3
dc1668acf
DEMO MANUAL DC1668A-C
QUICK START PROCEDURE
Figure 1. Test Setup of DC1668A-C
–+
+–
V
A
+
+
–
–
V
A
VIN
BNC CABLE
TO OSCILLOSCOPE
TERMINATE INTO 50Ω
LOAD
1668ac F01

4
dc1668acf
DEMO MANUAL DC1668A-C
QUICK START PROCEDURE
Figure 2. Measured Efficiency at 12VIN, 500kHz
Figure 4. Measured Load Step Response
Figure 3. Thermal Capture at 12VIN, 1.8VOUT, 50A, 500kHz
No Forced Airflow (Convection). TA= 29°C
Figure 5. Measured Output Voltage Ripple (20MHz BW)
LOAD CURRENT (A)
0
EFFICIENCY (%)
504030
1668ac F02
95
90
2010
85
80
75
70
3.3VOUT
2.5VOUT
1.8VOUT
1.5VOUT
1.2VOUT
1VOUT
1668ac F04
20A/DIV
100mV/DIV
VOUT
IOUT STEP
VOUT = 1.8V
IOUT DC = 25A
IOUT STEP = 25A
fSW = 500kHz
1668ac F05
20mV/DIV
VOUT
VOUT = 1.8V
IOUT = 50A
fSW = 500kHz

5
dc1668acf
DEMO MANUAL DC1668A-C
PARTS LIST
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
Required Circuit Components:
1 1 CIN1 Cap, 150µF 20% 35V Alum Sanyo 35MV150WXV
2 4 CIN13, CIN18, CIN20, CIN22 Cap, 1210 22µF 20% 25V X5R AVX 12103D226MAT2A
3 4 COUT1, COUT5, COUT9, COUT13 Cap, 1812 100µF 20% 6.3V X5R TDK C4532X5R0J107MZ
4 3 COUT20, COUT21, COUT25 Cap, 470µF 20% 4V POSCAP Sanyo POSCAP 4TPF470ML
5 2 R8 Res, 0603 0Ω Jumper Vishay CRCW06030000Z0EA
6 2 R18,R19 Res, 0603 10Ω 5% 1/10W AAC CR16-100JM
7 4 R30, R31, R32, R33 Res, 0603 100Ω 5% 1/10W KOA RK73B1JTTD101J
8 1 R34 Res, 0603 100k 5% 1/10W Vishay CRCW0603100KJNEA
9 1 R35 Res, 0805 0Ω Jumper Vishay CRCW08050000Z0EA
10 1 U5 IC, LTC6902CMS Multiphase Oscillator Linear Technology LTC6902CMS
11 1 C12 Cap, 0603 100pF 10% 50V NP0 AVX 06035A101KAT2A
12 4 C52, C53, C54, C61 Cap, 0603 180pF 5% 50V NP0 AVX 06035A181JAT
13 1 C61 Cap, 0603 180pF 5% 50V NP0 AVX 06035A181JAT
14 2 C65, C67 Cap, 0603 1000pF 10% 50V NP0 AVX 06035A102KAT2A
15 1 R1 Res, 0603 7.5k 1% 1/10W Vishay CRCW06037K50FKEA
16 1 R2 Res, 0603 10k 1% 1/10W Vishay CRCW060310K0FKEA
17 1 R3 Res, 0603 4.75k 1% 1/10W Vishay CRCW06034K75FKED
18 1 R4 Res, 0603 3.32k 1% 1/10W Vishay CRCW0603K32FKEA
19 1 R12 Res, 0603 22.6k 1% 1/10W Vishay CRCW060322K6FKEA
20 1 R14 Res, 0603 15k 1% 1/10W Vishay CRCW060315K0FKEA
21 1 R27 Res, 0603 0Ω Jumper Vishay CRCW06030000Z0EA
22 1 R29 Res, 0603 100k 1% 1/10W Vishay CRCW0603100KFKEA
23 4 U1, U2, U3, U4 IC, µModule Regulator Linear Technology LTM4627EV
Additional Demo Board Circuit Components:
1 2 C14, C28 Cap, 0603 0.1µF 20% 16V X7R Taiyo Yuden EMK107BJ104MA-T
2 1 C16 Cap, 0603 1µF 20% 10V X5R Taiyo Yuden LMK107BJ105MA-T
3 1 C60 Cap, 0603 1000pF 10% 50V NP0 AVX 06035A102KAT2A
4 1 D1 Diode, Zener 350mW Diodes Inc. MMBZ5227B
5 1 R7 Res, 0805 2k 5% 1/10W AAC CR10-202JM
6 1 Q14 XSTR, SUD50N03-10CP MOSFET Siliconix SUD50N03-10CP
7 1 R10 Res, 0603 10k 5% 1/10W AAC CR16-103JM
8 2 R20 Res, 0603 0Ω Jumper Vishay CRCW06030000Z0EA
9 3 R11, R16, R17 Res, 2512 0.015Ω 1% 1W Panasonic ERJM1WSF15MU
10 0 CIN2, CIN3 Cap, 1206 10µF 20% 35V X5R Option Taiyo Yuden GMK316BJ106ML-T Option
11 0 CIN14, CIN19, CIN21, CIN23 Cap, 1210 22µF 20% 25V X5R Option AVX 12103D226MAT2A Option
12 0 COUT2, COUT3, COUT6 Cap, 1812 100µF 20% 6.3V X5R Option TDK C4532X5R0J107MZ Option
13 0 COUT4, COUT7, COUT11 Cap, 1812 Option Taiyo Yuden JMK432BJ107MU-T Option
14 COUT15
15 0 COUT10, COUT14 Cap, 1812 100µF 20% 6.3V X5R Option TDK C4532X5R0J107MZ Option

6
dc1668acf
DEMO MANUAL DC1668A-C
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
16 0 COUT19 Cap, 1206 Option Taiyo Yuden EMK316BJ475ML-T Option
17 0 COUT23, COUT26, COUT27 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML Option
18 0 COUT24 Cap, 1812 Option Taiyo Yuden JMK316BJ226ML-T
19 0 C15 Cap, 0603 1µF 20% 10V X5R Option Taiyo Yuden LMK107BJ105MA-T Option
20 0 C18, C55, C56, C57, C58, C62 Cap, 0603 Option Option
21 C74 to C77
22 0 C59, C63, C66, C68 Cap, 0805 Option Option
23 0 C64 Cap, 0603 1000pF 10% 50V NP0 Option AVX 06035A102KAT2A Option
24 0 C69, C71, C72, C73 Cap, 150µF 20% 35V Alum Option Sanyo 35MV150WXV Option
25 1 C70 Cap, 0603 0.22µF 20% 10V X5R Option Taiyo Yuden LMK107BJ224MA-T Option
26 0 R9, R13, R15, R23, R24 Res, 0603 51k 5% 1/10W Option AAC CR16-513JM Option
27 0 R21, R22, R36 Res, 0603 Option Option
28 0 COUT22 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML Option
29 1 COUT25 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML
30 1 R26 Res, 0603 Option Option
Hardware
1 6 JP1, JP2, JP3, JP4, JP5, JP8 Header, 2 Pin, 2mm Samtec TMM 102-02-L-S
2 2 JP6, JP7 Header, 3 Pin, 2mm Samtec TMM-103-02-L-S
3 4 J1, J2, J3, J4 Stud, Press-Fit PEM KFH-032-10
4 2 J5, J6 Conn, BNC, 5 Pins Connex 112404
5 10 TP1 to TP8, TP13, TP14 Turret Mill Max 2501-2-00-80-00-00-07-0
6 3 JP1, JP6, JP7 Shunt, 2mm Samtec 2SN-BK-G
7 4 Standoff, Snap On Keystone 8834
8 8 J1, J2, J3, J4 Nut, Brass #10-32 Any
9 4 J1, J2, J3, J4 Washer, Brass #10 Any
10 4 J1, J2, J3, J4 Lug, Ring Keystone 310 PbF
PARTS LIST

7
dc1668acf
DEMO MANUAL DC1668A-C
SCHEMATIC DIAGRAMS
SOFTSTART
EXT.TRACK
1 3
2
VIN
GND
VIN+
VIN-
COMP
IOSTEP CLK
VO+ VOUT
GND
VO- TRACK/SS
VOUT
OFF ON
IOSTEP
0.6V - 3.3V
3.3V1.2V 1.5V 2.5V1.8V
VOUT SEL
4.5V - 20V
SHT 2,3
SHT 2,3
SHT 2,3
SHT 2,3
SHT 3 SHT 2,3
SGND
1 2 3
TRACK/SS
RUN
** ****
1.0V
PGOOD
*
*
4
402K
U1-U4
15k
IC
100pF
OPT OPT
4TPF470ML
68pF
45.3k
10k
3.32k
30.1k OPT
CIN22
1nF
47pF
100K OPT
Poscap
1nF100uF
R27
0
0
OPT40A
R1
Poscap
100uF
10k15k
6.34k
180pF
OPT
C61
68pF
OPT 22uF
R29
9.53k
3
30A
R12
180pF
OPT
COUT22R26ASSY
1nF OPTOPT6.65k
OPT13.3k 4.42k
COUT25 C54
180pF
47pF
R2
- A
*
100uF
CIN20
180pF7.5k
IOUT R3
U1,U2
30.1k 22uF
C53C12
OPT
2
50A
OPT
OPT
OPT 68pF OPT
4.75k
U1-U3 4TPF470ML
OPT
C65COUT9 OPT
OPT
* FSW = 500KHz
- C
20k
PHASE No.
22.6k
C67COUT13 C52R14
100pF
OPT
22uF
20k- B 133K
R4
47pF
EXTVCC
NOTES: UNLESS OTHERWISE SPECIFIED,
35MV150WXV
1206 1206
35MV150WXV
1210 1210
0805
1206
2512 2512 2512
7343
1812 1812 1812 1812 1812
0805
1. ALL RESISTORS AND CAPACITORS ARE 0603.
SHT 2,3
VO+
VO-
VFB
VIN
VO- VO+
VOUT
VOUT
DIFFVOUT
COMP
VIN
VOUT
VIN
5V
VIN
5V
CLK1
COMP
VFB
DIFFVOUT
TRACK/SS RUN
EXTVCC
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
FIRST PROTOTYPE
104/29/10
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
FIRST PROTOTYPE
104/29/10
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
FIRST PROTOTYPE
104/29/10
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
C70 OPT C70 OPT
R20 0R20 0
J6J6
1
2
3
4
5
C16 1uF C16 1uF
C74 OPT C74 OPT
+
CIN1 150uF
+
CIN1 150uF
12
JP3JP3
CIN2 OPT 35V CIN2 OPT 35V
COUT3 OPT COUT3 OPT
TP14TP14
C61 *C61 *
COUT1 100uF 6.3V COUT1 100uF 6.3V
TP2TP2
R8 0R8 0
R17
0.015
1%
R17
0.015
1%
C18 OPT C18 OPT
COUT24
OPT
COUT24
OPT
TP4TP4
R21 OPT R21 OPT
JP5JP5
TP1TP1
JP1JP1
R14 1% R14 1%
Q14
SUD50N03-10CP
Q14
SUD50N03-10CP
1
23
J5J5
1
2
3
4
5
R2 1% R2 1%
R19 10 R19 10
TP6TP6
JP8JP8
CIN14 OPT 25V CIN14 OPT 25V
TP5TP5
+
C69 OPT
+
C69 OPT
12
R13 OPTR13 OPT
COUT2 OPT COUT2 OPT
J1J1
C55 OPT C55 OPT
R16
0.015
1%
R16
0.015
1%
C59 OPT C59 OPT
TP3TP3
JP6JP6
D1 MMBZ5227B D1 MMBZ5227B
1 3
R9 OPT R9 OPT
C62 OPT C62 OPT
R34 100KR34 100K
J2J2
R35 0 R35 0
CIN3 OPT 35V CIN3 OPT 35V
C60 1nFC60 1nF
U1
LTM4627EV
U1
LTM4627EV
SGND
G11
FSET
B12
VOUT_LCL
L12
COMP
A11
VFB
F12
RUN A10
TRACK/SS A9
PLLIN A8
INTVCC
A7
VOSNS+
J12
VOSNS-
M12
DIFF_VOUT
K12
INTVCC
D9
VIN A1
VIN A2
VIN A3
VIN A4
VIN A5
VIN A6
VIN B1
VIN B2
VIN B3
VIN B4
VIN B5
VIN B6
VIN C1
VIN C2
VIN C3
VIN C4
VIN C5
VIN C6
VOUT J1
VOUT J2
VOUT J3
VOUT J4
VOUT J5
VOUT J6
VOUT J7
VOUT J8
VOUT J9
VOUT J10
VOUT K1
VOUT K2
VOUT K3
VOUT K4
VOUT K5
VOUT K6
VOUT K7
VOUT K8
VOUT K9
VOUT K10
VOUT K11
VOUT L1 VOUT L2 VOUT L3 VOUT L4 VOUT L5 VOUT L6 VOUT L7 VOUT L8 VOUT L9 VOUT L10 VOUT L11 VOUT M1 VOUT M2 VOUT M3 VOUT M4 VOUT M5 VOUT M6 VOUT M7 VOUT M8 VOUT M9 VOUT M10 VOUT M11
PGND
D1
PGND
D2
PGND
D3
PGND
D4
PGND
D5
PGND
D6
PGND
E1
PGND
E2
PGND
E3
PGND
E4
PGND
E5
PGND
E6
PGND
E7
PGND
F1
PGND
F2
PGND
F3
PGND
F4
PGND
F5
PGND
F6
PGND
F7
PGND
F8
PGND
F9
PGND
G1
PGND
G2
PGND
G3
PGND
G4
PGND
G5
PGND
G6
PGND
G7
PGND
G8
PGND
G9
PGND
H1
PGND
H2
PGND
H3
PGND
H4
PGND
H5
PGND H6 PGND H7 PGND H8 PGND H9
SGND
H11
SGND
H12
PGND
C9 PGND
C7 PGND
B9 PGND
B7
PGND
D8
PGND
E9
PGOOD
F11
PGOOD
G12
MTP8 D12 MTP7 D11 MTP6 D10 MTP5 C12 MTP4 C11 MTP3 C10 MTP2 B11
EXTVCC
E12
MTP1 A12
CIN13
22uF
25V
CIN13
22uF
25V
JP2JP2
R10 10K R10 10K
R4
1%
R4
1%
R18 10 R18 10
TP7TP7
R11
0.015
1%
R11
0.015
1%
R3 1% R3 1%
R1 1% R1 1%
R22 OPT R22 OPT
R36
OPT
R36
OPT
R12 1% R12 1%
C12 * C12 *
COUT19
OPT
COUT19
OPT
JP7JP7
J3J3
TP13TP13
R7 2K R7 2K
+
COUT20 470uF 4V
+
COUT20 470uF 4V
12
C14 0.1uFC14 0.1uF
COUT4 OPT COUT4 OPT
JP4JP4
J4J4
TP8TP8
C15 OPT C15 OPT

8
dc1668acf
DEMO MANUAL DC1668A-C
SCHEMATIC DIAGRAMS
SHT 1,3
SHT 1,3
SHT 1,3 SHT 1,3
SHT 1,3 SHT 3
SHT 3
*
*
SHT 1,3
35MV150WXV
1210
1210
0805
7343 1812 1812 1812
1812 1812
7343 1812
35MV150WXV
1210 1210
0805
TRACK/SS
COMP DIFFVOUT VFB
VFB DIFFVOUT
EXTVCC
COMP EXTVCC
VIN
VOUT
VIN VOUT
VFB
DIFFVOUT
COMP
CLK2 TRACK/SS RUN
CLK3
EXTVCC
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
CIN21 OPT CIN21 OPT
C63
OPT
C63
OPT
CIN19 OPT CIN19 OPT
+
C71
OPT
+
C71
OPT
12
U2
LTM4627EV
U2
LTM4627EV
SGND
G11
FSET
B12
VOUT_LCL
L12
COMP
A11
VFB
F12
RUN A10
TRACK/SS A9
PLLIN A8
INTVCC
A7
VOSNS+
J12
VOSNS-
M12
DIFF_VOUT
K12
INTVCC
D9
VIN A1
VIN A2
VIN A3
VIN A4
VIN A5
VIN A6
VIN B1
VIN B2
VIN B3
VIN B4
VIN B5
VIN B6
VIN C1
VIN C2
VIN C3
VIN C4
VIN C5
VIN C6
VOUT J1
VOUT J2
VOUT J3
VOUT J4
VOUT J5
VOUT J6
VOUT J7
VOUT J8
VOUT J9
VOUT J10
VOUT K1
VOUT K2
VOUT K3
VOUT K4
VOUT K5
VOUT K6
VOUT K7
VOUT K8
VOUT K9
VOUT K10
VOUT K11
VOUT L1 VOUT L2 VOUT L3 VOUT L4 VOUT L5 VOUT L6 VOUT L7 VOUT L8 VOUT L9 VOUT L10 VOUT L11 VOUT M1 VOUT M2 VOUT M3 VOUT M4 VOUT M5 VOUT M6 VOUT M7 VOUT M8 VOUT M9 VOUT M10 VOUT M11
PGND
D1
PGND
D2
PGND
D3
PGND
D4
PGND
D5
PGND
D6
PGND
E1
PGND
E2
PGND
E3
PGND
E4
PGND
E5
PGND
E6
PGND
E7
PGND
F1
PGND
F2
PGND
F3
PGND
F4
PGND
F5
PGND
F6
PGND
F7
PGND
F8
PGND
F9
PGND
G1
PGND
G2
PGND
G3
PGND
G4
PGND
G5
PGND
G6
PGND
G7
PGND
G8
PGND
G9
PGND
H1
PGND
H2
PGND
H3
PGND
H4
PGND
H5
PGND H6 PGND H7 PGND H8 PGND H9
SGND
H11
SGND
H12
PGND
C9 PGND
C7 PGND
B9 PGND
B7
PGND
D8
PGND
E9
PGOOD
F11
PGOOD
G12
MTP8 D12 MTP7 D11 MTP6 D10 MTP5 C12 MTP4 C11 MTP3 C10 MTP2 B11
EXTVCC
E12
MTP1 A12
C52 * C52 *
C64 1nFC64 1nF
C76 OPT C76 OPT
COUT5 100uF COUT5 100uF
COUT10
OPT
COUT10
OPT
COUT6 OPT COUT6 OPT
R23 OPTR23 OPT
+
COUT21 470uF
4V
+
COUT21 470uF
4V
12
R15 OPT R15 OPT
C53 * C53 *
COUT9
*
COUT9
*
COUT7 OPT COUT7 OPT
U3
LTM4627EV
U3
LTM4627EV
SGND
G11
FSET
B12
VOUT_LCL
L12
COMP
A11
VFB
F12
RUN A10
TRACK/SS A9
PLLIN A8
INTVCC
A7
VOSNS+
J12
VOSNS-
M12
DIFF_VOUT
K12
INTVCC
D9
VIN A1
VIN A2
VIN A3
VIN A4
VIN A5
VIN A6
VIN B1
VIN B2
VIN B3
VIN B4
VIN B5
VIN B6
VIN C1
VIN C2
VIN C3
VIN C4
VIN C5
VIN C6
VOUT J1
VOUT J2
VOUT J3
VOUT J4
VOUT J5
VOUT J6
VOUT J7
VOUT J8
VOUT J9
VOUT J10
VOUT K1
VOUT K2
VOUT K3
VOUT K4
VOUT K5
VOUT K6
VOUT K7
VOUT K8
VOUT K9
VOUT K10
VOUT K11
VOUT L1 VOUT L2 VOUT L3 VOUT L4 VOUT L5 VOUT L6 VOUT L7 VOUT L8 VOUT L9 VOUT L10 VOUT L11 VOUT M1 VOUT M2 VOUT M3 VOUT M4 VOUT M5 VOUT M6 VOUT M7 VOUT M8 VOUT M9 VOUT M10 VOUT M11
PGND
D1
PGND
D2
PGND
D3
PGND
D4
PGND
D5
PGND
D6
PGND
E1
PGND
E2
PGND
E3
PGND
E4
PGND
E5
PGND
E6
PGND
E7
PGND
F1
PGND
F2
PGND
F3
PGND
F4
PGND
F5
PGND
F6
PGND
F7
PGND
F8
PGND
F9
PGND
G1
PGND
G2
PGND
G3
PGND
G4
PGND
G5
PGND
G6
PGND
G7
PGND
G8
PGND
G9
PGND
H1
PGND
H2
PGND
H3
PGND
H4
PGND
H5
PGND H6 PGND H7 PGND H8 PGND H9
SGND
H11
SGND
H12
PGND
C9 PGND
C7 PGND
B9 PGND
B7
PGND
D8
PGND
E9
PGOOD
F11
PGOOD
G12
MTP8 D12 MTP7 D11 MTP6 D10 MTP5 C12 MTP4 C11 MTP3 C10 MTP2 B11
EXTVCC
E12
MTP1 A12
+
COUT22
*
+
COUT22
*
12
+
C72 OPT
+
C72 OPT
12
CIN18 22uF 25V CIN18 22uF 25V
C75 OPT C75 OPT
C56 OPTC56 OPT
C57 OPTC57 OPT
C65 * C65 *
C68 OPTC68 OPT
COUT11
OPT
COUT11
OPT
CIN20
*
CIN20
*

9
dc1668acf
DEMO MANUAL DC1668A-C
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. LinearTechnology Corporation makes no representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAMS
SHT 1,2
SHT 1,2
SHT 1,2 SHT 1,2
SHT 1,2
SHT 1 SHT 2 SHT 2
*
SHT 1,2
35MV150WXV
1210
1210
0805
7343 7343 7343
7343
1812 1812
CLK4
VOUT
VIN
5V
5V
VOUT
DIFFVOUT
VFB
CLK1 CLK2 CLK3
TRACK/SS RUN
COMP
EXTVCC
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
 
 
 




TECHNOLOGY
    

        





Wednesday, October 20, 2010

HIGH EFFICIENCY POLYPHASE STEP-DOWN



LTM4627EV
DEMO CIRCUIT 1668A
POWER MODULE


R
+
COUT27 OPT
+
COUT27 OPT
12
COUT14 OPT COUT14 OPT
R29
*
1%
R29
*
1%
COUT13
*
COUT13
*
C54 *C54 *
R26
*
R26
*
R31 100R31 100
+
C73 OPT
+
C73 OPT
12
R30 100R30 100
C77 OPT C77 OPT
R32 100R32 100
+
COUT25 *
+
COUT25 *
12
+
COUT26 OPT
+
COUT26 OPT
12
C67 * C67 *
C66
OPT
C66
OPT
C58 OPTC58 OPT
U4
LTM4627EV
U4
LTM4627EV
SGND
G11
FSET
B12
VOUT_LCL
L12
COMP
A11
VFB
F12
RUN A10
TRACK/SS A9
PLLIN A8
INTVCC
A7
VOSNS+
J12
VOSNS-
M12
DIFF_VOUT
K12
INTVCC
D9
VIN A1
VIN A2
VIN A3
VIN A4
VIN A5
VIN A6
VIN B1
VIN B2
VIN B3
VIN B4
VIN B5
VIN B6
VIN C1
VIN C2
VIN C3
VIN C4
VIN C5
VIN C6
VOUT J1
VOUT J2
VOUT J3
VOUT J4
VOUT J5
VOUT J6
VOUT J7
VOUT J8
VOUT J9
VOUT J10
VOUT K1
VOUT K2
VOUT K3
VOUT K4
VOUT K5
VOUT K6
VOUT K7
VOUT K8
VOUT K9
VOUT K10
VOUT K11
VOUT L1 VOUT L2 VOUT L3 VOUT L4 VOUT L5 VOUT L6 VOUT L7 VOUT L8 VOUT L9 VOUT L10 VOUT L11 VOUT M1 VOUT M2 VOUT M3 VOUT M4 VOUT M5 VOUT M6 VOUT M7 VOUT M8 VOUT M9 VOUT M10 VOUT M11
PGND
D1
PGND
D2
PGND
D3
PGND
D4
PGND
D5
PGND
D6
PGND
E1
PGND
E2
PGND
E3
PGND
E4
PGND
E5
PGND
E6
PGND
E7
PGND
F1
PGND
F2
PGND
F3
PGND
F4
PGND
F5
PGND
F6
PGND
F7
PGND
F8
PGND
F9
PGND
G1
PGND
G2
PGND
G3
PGND
G4
PGND
G5
PGND
G6
PGND
G7
PGND
G8
PGND
G9
PGND
H1
PGND
H2
PGND
H3
PGND
H4
PGND
H5
PGND H6 PGND H7 PGND H8 PGND H9
SGND
H11
SGND
H12
PGND
C9 PGND
C7 PGND
B9 PGND
B7
PGND
D8
PGND
E9
PGOOD
F11
PGOOD
G12
MTP8 D12 MTP7 D11 MTP6 D10 MTP5 C12 MTP4 C11 MTP3 C10 MTP2 B11
EXTVCC
E12
MTP1 A12
R24 OPT R24 OPT
U5
LTC6902CMS
U5
LTC6902CMS
V+
1
DIV
2
PH
3
OUT1
4
OUT2
5OUT3 6
OUT4 7
GND 8
MOD 9
SET 10
COUT15 OPT COUT15 OPT
CIN22 22uF * CIN22 22uF *
+
COUT23 OPT
+
COUT23 OPT
12
R33 100R33 100
R27
*
R27
*
C38 0.1uF C38 0.1uF
CIN23 OPT CIN23 OPT

10
dc1668acf
DEMO MANUAL DC1668A-C
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2010
LT 1110 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union direc-
tive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation