Intersil ISL75051SRHEVAL1Z User manual

USER’S MANUAL
AN1667
Rev.0.00
January 17, 2012
ISL75051SRHEVAL1Z
ISL75051SRH High Performance 3A LDO Evaluation Board
AN1667 Rev.0.00 Page 1 of 15
January 17, 2012
Description
The ISL75051SRH is a high-performance, adjustable,
low-voltage, high-current, low-dropout linear regulator
specified at 3A rated output current for input voltages from
2.2V to 6V. The LDO outputs can be adjusted from 0.8V to 5V
by means of two preset resistors. Salient features of the part
include:
• TID, ELDRS and SEE Rated
• Very Fast Load Transient Response
• ±2.0% Guaranteed VOUT Accuracy over Line, Load and
Temperature
• Typical Dropout of 287mV at 3A
•ENFeature
•PGFeature
• OCP Feature
•Short-circuitandOver-temperature Protection
The ISL75051SRHEVAL1Z evaluation board provides a simple
platform to evaluate performance of the ISL75051SRH. The
device output voltage is adjustable, and jumpers are provided
to easily set popular output voltages.
What’s Inside
The evaluation kit contains the following:
• ISL75051SRHEVAL1Z evaluation board
• ISL75051SRH datasheet
• AN1667 application note
Test Steps
1. Select the desired output voltage by shorting one of the
jumpers from J2 through J6. The option of JP7 provides for
continuous adjustment of VOUT using potentiometer R13.
2. Set the OCP limit by using jumpers JP8 and JP9. JP9 = 0.8A
min, and JP8 = 4A min.
3. Close JP10. Also closing jumper JP1 (2 and 3) selects
R2 = 5.49k as pull-up for PGOOD.
4. Ensure that the output capacitor and CPare set according
to recommended values shown in Table 1.
5. Connect the input supply to VIN/GND and the load to
VOUT/GND. Select the VIN to VOUT ratio to keep dissipation
within the thermal limits of the device.
6. Use JP11 to enable/disable the IC; Open = Enable, and
Close = Disable. (Note: For REVB boards, Close = Enable
and Open = Disable.)
FIGURE 1. ISL75051SRHEVAL1Z EVALUATION BOARD
January 17, 2012
AN1667.0

AN1667 Rev.0.00 Page 2 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
Optimizing LDO Performance
Performance of the ISL75051SRH can be optimized by following
the guidelines provided in this application note.
Input and Output Capacitor Selection
RH operation requires the use of a combination of tantalum and
ceramic capacitors to achieve a good volume-to-capacitance
ratio. The recommended combination is a 220µF, 25mΩ, 10V
DSSC 04051-032 rated tantalum capacitor in parallel with a
0.1µF MIL-PRF-49470 CDR04 ceramic capacitor. This is to be
connected between VIN to GND pins and VOUT to GND pins of the
LDO, with PCB traces no longer than 0.5cm. The stability of the
device depends on the capacitance and ESR of the output
capacitor. The usable ESR range for the device is 6mΩto
100mΩ. At the lower limit of ESR = 6mΩ, the phase margin is
about 51°C. On the high side, an ESR of 100mΩis found to limit
the gain margin at around 10dB. The typical GM/PM seen on the
ISL75051SRHEVAL1Z evaluation board for VIN = 3.3V,
VOUT = 1.8V, and IOUT = 3A, with a 220µF, 10V, 25mΩcapacitor,
is GM = 16.3dB and PM = 69.16°C.
Pole Capacitor (CP)
A small capacitor (CP) can be placed on the ADJ pin of the
ISL75051SRH, as shown in Figure 2, across the bottom resistor in
the feedback resistor divider. This is effectively a pole. The value of
the capacitor can be calculated using Equation 1:
The pole should be set to have the break frequency at 1MHz.
Table 1 gives the recommended values for output capacitors
(MLCC X5R/X7R) and CPfor different voltage rails. Correct
selection of the output capacitor and CPalso helps increase
PSRR at high frequencies. The board, however, uses a 100pF
capacitor as a typical value most suited for the application range.
Layout Guidelines
Good PCB layout is important to achieving expected
performance. When placing components and routing traces,
minimize ground impedance and keep parasitic inductance low.
Give the input and output capacitors a good ground connection,
and place them as close to the IC as possible. Route the traces
connecting the ADJ pin away from noisy planes and traces, and
keep the board capacitance of the ADJ net to GND as low as
possible.
Thermal Guidelines
If the die temperature exceeds +175°C typical, then the LDO
output shuts down to zero until the die temperature cools to
+155°C typical. The level of power combined with the thermal
impedance of the package (RTHjc of 4°C/W for the 18 Ld CDFP
package) determines whether the junction temperature exceeds
the thermal shutdown temperature specified in the “Electrical
Specifications” table of the ISL75051SRH datasheet. Mount the
device on a high effective thermal conductivity PCB with thermal
vias, per JESD51-7 and JESD51-5. Place a silpad between
package base and PCB copper plane. Select the VIN and VOUT
ratios to ensure that dissipation for the selected VIN range keeps
TJwithin the recommended operating level of 150°C for normal
operation.
(EQ. 1)
FP12piR
BOTTOM CP
=
FIGURE 2. ISL75051SRH TYPICAL APPLICATION
ISL75051SRH
CIN
RTOP
RBOTTOM
CP
VIN VOUT
EN
OCP
PG
COUT
ADJ
TABLE 1. RECOMMENDED OUTPUT CAPACITOR VALUES
VOUT
(V)
RTOP
(kΩ)
RBOTTOM
(Ω)
CP
(pF)
COUT
(µF)
5.0 4.32 499 120 220
4.0 4.32 634 120 220
2.5 4.32 1.13k 120 220
1.8 4.32 1.74k 100 220
1.5
(Note 1)
4.32 2.26k 100 47
1.5 4.32 2.26k 100 220
0.8 4.32 7.87k 68 220
NOTE:
1. Either option could be used depending on cost/performance
requirements.

AN1667 Rev.0.00 Page 3 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
Typical Performance Curves Unless otherwise specified, VIN = VOUT + 0.4V, VOUT = 1.8V, CIN = COUT = 10µF, TJ= +25°C,
ILOAD =0A.
FIGURE 3. START-UP WAVEFORMS: VIN = 6.0V, VOUT = 0.8V,
EN LOW TO HIGH
FIGURE 4. START-UP WAVEFORMS: VIN = 2.2V, VOUT = 0.8V,
EN LOW TO HIGH
FIGURE 5. SHUTDOWN WAVEFORM: VIN = 6.0V, VOUT = 0.8V,
EN HIGH TO LOW
FIGURE 6. SHUTDOWN WAVEFORM: VIN = 2.2V, VOUT = 0.8V,
EN HIGH TO LOW
FIGURE 7. LOAD TRANSIENT, VIN = 3.3V, VOUT = 2.5V,
COUT = 47µF 35mΩ
FIGURE 8. LOAD TRANSIENT, VIN = 3.3V, VOUT = 2.5V,
COUT = 220µF 25mΩ

AN1667 Rev.0.00 Page 4 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
FIGURE 9. ROCP (kΩ) vs OCP A OVER TEMP FIGURE 10. DROPOUT vs IOUT
FIGURE 11. LOAD REGULATION VOUT vs IOUT FIGURE 12. LOAD REGULATION VADJ vs IOUT
FIGURE 13. LOAD REGULATION VOUT vs IOUT FIGURE 14. LOAD REGULATION VADJ vs IOUT
Typical Performance Curves Unless otherwise specified, VIN = VOUT + 0.4V, VOUT = 1.8V, CIN = COUT = 10µF, TJ= +25°C,
ILOAD =0A. (Continued)
0
1
2
3
5
6
7
8
0123456
4
OCP A
ROCP (kΩ)
IOCP A = +25°C
IOCP A = +128°C
IOCP A = -58°C
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0123 4
IOUT (A)
VOLTAGE DROPOUT
+25°C
+125°C
+150°C
1.802
1.804
1.806
1.808
1.810
1.812
1.814
1.816
1.818
1.820
1.822
1.824
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
IOUT (A)
+128°C, VOUT (mV)
+25°C, VOUT (mV) -58°C, VOUT (mV)
VOUT (V)
VIN = 2.5V
VOUT = 1.8V
0.5165
0.5170
0.5175
0.5180
0.5185
0.5190
0.5195
0.5200
0.5205
0.5210
0.5215
0.00.51.01.52.02.53.03.5
IOUT (A)
+128°C, VADJ (mV)
+25°C, VADJ (mV)
-58°C, VADJ (mV)
VADJ (V)
VIN = 2.5V
VOUT = 1.8V
0.790
0.792
0.794
0.796
0.798
0.800
0.802
0.804
0.806
0.808
0.810
0.00.51.01.52.02.53.03.5
IOUT (A)
+128°C, VOUT (mV)
+25°C, VOUT (mV) -58°C, VOUT (mV)
VOUT (V)
VIN = 2.5V
VOUT = 0.8V
0.508
0.510
0.512
0.514
0.516
0.518
0.520
0.522
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
IOUT (A)
+128°C, VADJ (mV)
+25°C, VADJ (mV)
-58°C, VADJ (mV)
VADJ (V)
VIN = 2.5V
VOUT = 0.8V

AN1667 Rev.0.00 Page 5 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
FIGURE 15. LOAD REGULATION VOUT vs IOUT FIGURE 16. LOAD REGULATION VADJ vs IOUT
Typical Performance Curves Unless otherwise specified, VIN = VOUT + 0.4V, VOUT = 1.8V, CIN = COUT = 10µF, TJ= +25°C,
ILOAD =0A. (Continued)
2.485
2.490
2.495
2.500
2.505
2.510
2.515
2.520
2.525
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
IOUT (A)
+128°C, VOUT (mV)
+25°C, VOUT (mV)
-58°C, VOUT (mV)
VOUT (V)
VIN = 2.5V
VOUT = 0.8V
0.5160
0.5165
0.5170
0.5175
0.5180
0.5185
0.5190
0.5195
0.5200
0.5205
0.5210
0.5215
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
IOUT (A)
+128°C, VADJ (mV)
+25°C, VADJ (mV) -58°C, VADJ (mV)
VADJ (V)
VIN = 3.3V
VOUT = 2.5V

AN1667 Rev.0.00 Page 6 of 15 January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
Schematic

AN1667 Rev.0.00 Page 7 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
ISL75051SRHEVAL1Z Bill of Materials
PART NUMBER QTY UNITS
REFERENCE
DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART
ISL75051SRHEVAL1ZREVCPCB 1 ea PWB-PCB,
ISL75051SRHEVAL1Z,
REVC, ROHS
IMAGINEERING INC ISL75051SRHEVAL1ZREV
CPCB
C0805X472K5RACTU-T 1 ea C7B CAP, SMD, 0805,
4700pF, 50V, 10%, X7R,
AEC-Q200, ROHS
KEMET C0805X472K5RACTU
CDR04BX104AKWS 4 ea C1B, C5B, C6B, C6D CAP-MILQUAL, SMD,
1812, 0.1µF, 50V, 10%,
X7R, ROHS
AVX CDR04BX104AKWS
H1045-00101-50V5-T 1 ea C8 CAP, SMD, 0603, 100pF,
50V, 5%, C0G, ROHS
PANASONIC ECJ-1VC1H101J
H1045-00104-16V10-T 1 ea C1 CAP, SMD, 0603, 0.1µF,
16V, 10%, X7R, ROHS
MURATA GRM39X7R104K016AD
H1045-DNP 0 ea C1A, C5A, C6A, C6C CAP, SMD, 0603, DNP-
PLACE HOLDER, ROHS
H1046-DNP 0 ea C7A CAP, SMD, 0805, DNP-
PLACE HOLDER, ROHS
T525D227M010ATE025 2 ea C3D, C4D CAP-TANT, SMD, 7.3x4.3,
220µF, 10V, 20%,
25m, DF:10, ROHS
KEMET T525D227M010ATE025
108-0740-001 4 ea J1-J4 CONN-JACK, BANANA-
SS-SDRLESS, VERTICAL,
ROHS
JOHNSON
COMPONENTS
108-0740-001
131-4353-00 1 ea SP1 CONN-SCOPE PROBE
TEST PT, COMPACT, PCB
MNT, ROHS
TEKTRONIX 131-4353-00
1514-2 6 ea TP1-TP6 CONN-TURRET,
TERMINAL POST, TH,
ROHS
KEYSTONE 1514-2
5002 6 ea TP7-TP12 CONN-MINI TEST POINT,
VERTICAL, WHITE, ROHS
KEYSTONE 5002
68000-236HLF-1X3 1 ea JP1 CONN-HEADER, 1x3,
BREAKAWY 1x36,
2.54mm, ROHS
BERG/FCI 68000-236HLF
69190-202HLF 10 ea JP2-JP11 CONN-HEADER, 1x2,
RETENTIVE, 2.54mm,
0.230 x 0.120, ROHS
BERG/FCI 69190-202HLF
SSL-LXA3025IGC-TR 1 ea LED1 LED, SMD, 3x2.5mm, 4P,
RED/GREEN,
12/20MCD, 2V
LUMEX SSL-LXA3025IGC-TR
ISL75051SRH 1 ea U1 (SEE ASSEMBLY
INSTRUCTIONS)
IC-3A RAD HARD LDO
REGULATOR, 18P, CDFP,
ROHS
INTERSIL ISL75051SRH
2N7002LT1G-T 1 ea Q1 TRANSISTOR-MOS,
N-CHANNEL, SMD,
SOT23, 60V, 115mA,
ROHS
ON
SEMICONDUCTOR
2N7002LT1G

AN1667 Rev.0.00 Page 8 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
3299W-1-103LF 1 ea R13 POT-TRIM, TH, 3P, 10k,
1/2W, 10%, 3/8SQ,
25TURN, TOPADJ, ROHS
BOURNS 3299W-1-103LF
H2511-00R00-1/10W-T 1 ea R11 RES, SMD, 0603, 0,
1/10W, TF, ROHS
VENKEL CR0603-10W-000T
H2511-01000-1/10W1-T 1 ea R4 RES, SMD, 0603, 100,
1/10W, 1%, TF, ROHS
VENKEL CR0603-10W-1000FT
H2511-01002-1/10W1-T 1 ea R17 RES, SMD, 0603, 10k,
1/10W, 1%, TF, ROHS
KOA RK73H1JT1002F
H2511-01131-1/10W1-T 1 ea R8 RES, SMD, 0603, 1.13k,
1/10W, 1%, TF, ROHS
YAGEO RC0603FR-071K13L
H2511-01741-1/10W1-T 1 ea R7 RES, SMD, 0603, 1.74k,
1/10W, 1%, TF, ROHS
PANASONIC ERJ-3EKF1741V
H2511-02261-1/10W1-T 1 ea R6 RES, SMD, 0603, 2.26k,
1/10W, 1%, TF, ROHS
YAGEO RC0603FR-072K26L
H2511-02671-1/10W1-T 0 ea R12 RES, SMD, 0603, 2.67k,
1/10W, 1%, TF, ROHS
YAGEO RC0603FR-072K67L
H2511-04321-1/10W1-T 1 ea R10 RES, SMD, 0603, 4.32k,
1/10W, 1%, TF, ROHS
H2511-04991-1/10W1-T 1 ea R14 RES, SMD, 0603, 4.99k,
1/10W, 1%, TF, ROHS
PANASONIC ERJ-3EKF4991V
H2511-05110-1/10W1-T 1 ea R3 RES, SMD, 0603, 511,
1/10W, 1%, TF, ROHS
VENKEL CR0603-10W-5110FT
H2511-05490-1/10W1-T 1 ea R1 RES, SMD, 0603, 549,
1/10W, 1%, TF, ROHS
VENKEL CR0603-10W-5490FT
H2511-05491-1/10W1-T 1 ea R2 RES, SMD, 0603, 5.49k,
1/10W, 1%, TF, ROHS
VENKEL CR0603-10W-5491FT
H2511-06340-1/10W1-T 1 ea R9 RES, SMD, 0603, 634,
1/10W, 1%, TF, ROHS
YAGEO RC0603FR-07634RL
H2511-06800-1/10W1-T 2 ea R15, R16 RES, SMD, 0603, 680,
1/10W, 1%, TF, ROHS
ROHM MCR03EZPFX6800
H2511-07871-1/10W1-T 1 ea R5 RES, SMD, 0603, 7.87k,
1/10W, 1%, TF, ROHS
YAGEO RC0603FR-077K87L
4-40X1/2-SCREW 4 ea Four corners SCREW, 4-40x1/2in,
PAN, NYLON, PHILLIPS,
ROHS
4-40X3/4-STANDOFF 4 ea Four corners STANDOFF, 4-40x3/4in,
F/F, HEX, NYLON, ROHS
KEYSTONE 1902D
5X8-STATIC-BAG 1 ea Place assy in bag. BAG, STATIC, 5x8,
ZIPLOC, ROHS
INTERSIL 212403-013
ASSEMBLY INSTRUCTIONS 1 ea a) U1 - Cut a 0.4 inch
square of part #
SP2000-0.020-AC-
1212-NA
Instructions for
assembly.
INTERSIL ASSEMBLY INSTRUCTIONS
ASSEMBLY INSTRUCTIONS 1 ea b) Affix to PCB where U1
will be installed.
Instructions for
assembly.
INTERSIL ASSEMBLY INSTRUCTIONS
ISL75051SRHEVAL1Z Bill of Materials (Continued)
PART NUMBER QTY UNITS
REFERENCE
DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART

AN1667 Rev.0.00 Page 9 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
ASSEMBLY INSTRUCTIONS 1 ea c) HAND SOLDER U1 on
top of insulation
Instructions for
assembly.
INTERSIL ASSEMBLY INSTRUCTIONS
ASSEMBLY INSTRUCTIONS 1 ea d) Wash after soldering Instructions for
assembly.
INTERSIL ASSEMBLY INSTRUCTIONS
DNP 0 ea C3A, C3C, C4A, C4C
(6TPF220ML)
DO NOT POPULATE OR
PURCHASE
LABEL-DATE CODE 1 ea LABEL-FOR DATE CODE
AND BOM REV #
INTERSIL LABEL-DATE CODE
SP2000-0.020-AC-1212-NA 0.3 ea U1 (SEE ASSEMBLY
INSTRUCTIONS)
INSULATION-SILICONE
ELASTOMER, 12x12,
0.020in, W/ADHESIVE,
ROHS
BERGQUIST SP2000-0.020-AC-1212-
NA
ISL75051SRHEVAL1Z Bill of Materials (Continued)
PART NUMBER QTY UNITS
REFERENCE
DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART

AN1667 Rev.0.00 Page 10 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
Layout
FIGURE 17. SILK SCREEN TOP
FIGURE 18. TOP LAYER COMPONENT SIDE

AN1667 Rev.0.00 Page 11 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
FIGURE 19. LAYER 2
FIGURE 20. LAYER 3
Layout (Continued)

AN1667 Rev.0.00 Page 12 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
FIGURE 21. BOTTOM LAYER SOLDER SIDE
FIGURE 22. SILK SCREEN BOTTOM
Layout (Continued)

AN1667 Rev.0.00 Page 13 of 15
January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
FIGURE 23. SILK SCREEN BOTTOM MIRROR
Layout (Continued)

AN1667 Rev.0.00 Page 14 of 15 January 17, 2012
ISL75051SRHEVAL1Z AN1667.0
Drill Drawings

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