Fujitsu MB39A104 User manual

DS04-27231-5Ea
FUJITSU MICROELECTRONICS
DATA SHEET
Copyright©2002-2008 FUJITSU MICROELECTRONICS LIMITED All rights reserved
2006.8
ASSP For Power Management Applications
(General Purpose DC/DC Converter)
2-ch DC/DC Converter IC
with Overcurrent Protection
MB39A104
■DESCRIPTION
The MB39A104 is a 2-channel DC/DC converter IC using pulse width modulation (PWM), incorporating an
overcurrent protection circuit (requiring no current sense resistor). This IC is ideal for down conversion.
Operating at high frequency reduces the value of coil.
This is ideal for built-in power supply such as LCD monitors and ADSL.
This product is covered by US Patent Number 6,147,477.
■FEATURES
• Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor)
• Power supply voltage range : 7 V to 19 V
• Reference voltage : 5.0 V ±1 %
• Error amplifier threshold voltage : 1.24 V ±1 %
• High-frequency operation capability : 1.5 MHz (Max)
• Built-in standby function: 0 µA (Typ)
• Built-in soft-start circuit independent of loads
• Built-in totem-pole type output for P-ch MOS FET
• One type of package (SSOP-24 pin : 1 type)
■APPLICATION
• LCD monitor/panel
• IP phone
• Printer
• Video capture etc.

MB39A104
2
■PIN ASSIGNMENTS
(TOP VIEW)
(FPT-24P-M03)
1
2
3
4
5
6
7
8
9
10
11
12
VCCO :
VH :
OUT1 :
VS1 :
ILIM1 :
DTC1 :
VCC :
CSCP :
FB1 :
−INE1 :
CS1 :
RT :
24
23
22
21
20
19
18
17
16
15
14
13
: CTL
: GNDO
: OUT2
: VS2
: ILIM2
: DTC2
: GND
: VREF
: FB2
: −INE2
: CS2
: CT

MB39A104
3
■PIN DESCRIPTION
Pin No. Symbol I/O Descriptions
1 VCCO ⎯Output circuit power supply terminal (Connect to same potential as VCC pin)
2 VH O Power supply terminal for FET drive circuit (VH =VCC −5 V)
3 OUT1 O External P-ch MOS FET gate drive terminal
4 VS1 I Overcurrent protection circuit input terminal
5ILIM1I
Overcurrent protection circuit detection resistor connection terminal. Set
overcurrent detection reference voltage depending on external resistor and
internal current resource (110 µA at RT=24 kΩ)
6DTC1I
PWM comparator block (PWM) input terminal. Compares the lowest voltage
among FB1 and DTC1 terminals with triangular wave and controls output.
7VCC⎯Power supply terminal for reference power supply and control circuit
(Connect to same potential as the VCCO terminal)
8CSCP⎯Timer-latch short-circuit protection capacitor connection terminal
9 FB1 O Error amplifier (Error Amp 1) output terminal
10 −INE1 I Error amplifier (Error Amp 1) inverted input terminal
11 CS1 ⎯Soft-start capacitor connection terminal
12 RT ⎯Triangular wave oscillation frequency setting resistor connection terminal
13 CT ⎯Triangular wave oscillation frequency setting capacitor connection terminal
14 CS2 ⎯Soft-start capacitor connection terminal
15 −INE2 I Error amplifier (Error Amp 2) inverted input terminal
16 FB2 O Error amplifier (Error Amp 2) output terminal
17 VREF O Reference voltage output terminal
18 GND ⎯Output circuit ground terminal (Connect to same potential as GNDO
terminal.)
19 DTC2 I PWM comparator block (PWM) input terminal. Compares the lowest voltage
among FB2 and DTC2 terminals with triangular wave and controls output.
20 ILIM2 I
Overcurrent protection circuit detection resistor connection terminal. Set
overcurrent detection reference voltage depending on external resistor and
internal current resource (110 µA at RT=24 kΩ)
21 VS2 I Overcurrent protection circuit input terminal
22 OUT2 O External P-ch MOS FET gate drive terminal
23 GNDO ⎯Output circuit ground terminal (Connect to same potential as GND terminal)
24 CTL I Power supply control terminal. Setting the CTL terminal at “L” level places IC
in the standby mode.

MB39A104
4
■BLOCK DIAGRAM
+
++
+
+
++
+
+
+
+
+
10 VREF
VREF
11
9
6
15
14
16
19
8
CS1
FB1
DTC1
CS2
FB2
DTC2
CSCP
12 13 1817
RT CT GNDVREF
24
7
23
2
20
21
22
5
4
3
1
CTL
VCC
GNDO
VH
ILIM2
VS2
OUT2
ILIM1
VS1
OUT1
VCCO
1.24 V
1.24 V
(3.1 V)
SCP
Comp.
SCP
Logic
UVLO
OSC VREF
Bias
Voltage
Current
Protection
Logic
Current
Protection
Logic
IO=200 mA
at VCCO =12 V
IO=200 mA
at VCCO =12 V
VR1
VH
1.24 V
2.5 V
1.5 V
5.0 V
bias Power
ON/OFF
CTL
P-ch
Drive2
P-ch
Drive1
PWM
Comp.1
PWM
Comp.2
Error
Amp2
Error
Amp1
CH1
CH2
−INE1
−INE2
10 µA
VCC − 5 V
10 µA
L priority
L priority
L priority
L priority
H priority
H: at SCP
H:UVLO
release
Accuracy
±1%
H: at OCP
Error Amp Power Supply
Error Amp Referennce

MB39A104
5
■ABSOLUTE MAXIMUM RATINGS
* : The packages are mounted on the epoxy board (10 cm ×10 cm).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
■RECOMMENDED OPERATING CONDITIONS
* : Refer to“ ■SETTING THE TRIANGULAR OSCILLATION FREQUENCY”.
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the
semiconductor device. All of the device’s electrical characteristics are warranted when the device is
operated within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on
the data sheet. Users considering application outside the listed conditions are advised to contact their
representatives beforehand.
Parameter Symbol Condition Rating Unit
Min Max
Power supply voltage VCC VCC, VCCO terminal ⎯20 V
Output current IOOUT1, OUT2 terminal ⎯60 mA
Output peak current IOP Duty ≤5%(t =1/fOSC×Duty) ⎯700 mA
Power dissipation PDTa ≤+25 °C⎯740* mW
Storage temperature TSTG ⎯−55 +125 °C
Parameter Symbol Condition Value Unit
Min Typ Max
Power supply voltage VCC VCC, VCCO terminal 7 12 19 V
Reference voltage output current IREF VREF terminal −1⎯0mA
VH output current IVH VH terminal 0⎯30 mA
Input voltage VINE −INE1, −INE2 terminal 0 ⎯VCC −0.9 V
VDTC DTC1, DTC2 terminal 0 ⎯VCC −0.9 V
Control input voltage VCTL CTL terminal 0 ⎯19 V
Output current IOOUT1, OUT2 terminal −45 ⎯+45 mA
Output Peak current IOP Duty ≤5%(t =1/fOSC×Duty) −450 ⎯+450 mA
Oscillation frequency fOSC
Overcurrent detection
by ON resistance of FET 100 500 1000 kHz
* 100 500 1500 kHz
Timing capacitor CT⎯39 100 560 pF
Timing resistor RT⎯11 24 130 kΩ
VH terminal capacitor CVH VH terminal ⎯0.1 1.0 µF
Soft-start capacitor CSCS1, CS2 terminal ⎯0.1 1.0 µF
Short-circuit detection capacitor CSCP CSCP terminal ⎯0.1 1.0 µF
Reference voltage output
capacitor CREF VREF terminal ⎯0.1 1.0 µF
Operating ambient temperature Ta ⎯−30 +25 +85 °C

MB39A104
6
■ELECTRICAL CHARACTERISTICS
(VCC =VCCO =12 V, VREF =0 mA, Ta =+25 °C)
(Continued)
Parameter Symbol Pin No Conditions Value Unit
Min Typ Max
1.Reference
voltage
block [REF]
Output voltage VREF 17 Ta =+25 °C 4.95 5.00 5.05 V
Output voltage
temperature
variation
∆VREF/
VREF 17 Ta =0 °C to +85 °C⎯0.5* ⎯%
Input stability Line 17 VCC =7 V to 19 V ⎯310mV
Load stability Load 17 VREF =0 mA to −1 mA ⎯110mV
Short-circuit
output current IOS 17 VREF =1 V −50 −25 −12 mA
2.Under
voltage lockout
protection circuit
block [UVLO]
Threshold
voltage
VTLH 17 VREF =2.6 2.8 3.0 V
VTHL 17 VREF =2.4 2.6 2.8 V
Hysteresis
width VH17 ⎯⎯0.2* ⎯V
3.Short-circuit
detection block
[SCP Logic]
Threshold
voltage VTH 8⎯0.68 0.73 0.78 V
Input source
current ICSCP 8⎯−1.4 −1.0 −0.6 µA
Reset voltage VRST 17 VREF =2.4 2.6 2.8 V
4.Short-circuit
detection block
[SCP Comp.]
Threshold
voltage VTH 8⎯2.8 3.1 3.4 V
5.Triangular
wave oscillator
block [OSC]
Oscillation
frequency fOSC 13 CT=100 pF, RT=24 kΩ450 500 550 kHz
Frequency
temperature
variation
∆fOSC/
fOSC 13 Ta =0 °C to +85 °C⎯1* ⎯%
6.Soft-
start
block
[CS1, CS2]
Charge current ICS 11, 14 CS1 =CS2 =0 V −14 −10 −6µA
7.Error amplifier
block
[Error Amp1, Error Amp2]
Threshold
voltage VTH 9, 16 FB1 =FB2 =2 V 1.227 1.240 1.253 V
Input bias
current IB10, 15 −INE1 =−INE2 =0 V −120 −30 ⎯nA
Voltage gain AV9, 16 DC ⎯100* ⎯dB

MB39A104
7
(Continued)
(VCC =VCCO =12 V, VREF =0 mA, Ta =+25 °C)
*: Standard design value.
Parameter Symbol Pin No. Conditions Value Unit
Min Typ Max
7.Error amplifier block
[Error Amp1, Error Amp2]
Frequency
bandwidth BW 9, 16 AV=0 dB ⎯1.6* ⎯MHz
Output voltage VOH 9, 16 ⎯4.7 4.9 ⎯V
VOL 9, 16 ⎯⎯40 200 mV
Output source
current ISOURCE 9, 16 FB1 =FB2 =2 V ⎯−2−1mA
Output sink current ISINK 9, 16 FB1 =FB2 =2 V 150 200 ⎯µA
8.PWM comparator
block
[PWM Comp.1,
PWM Comp.2]
Threshold voltage
VT0 6, 19 Duty cycle =0 %1.4 1.5 ⎯V
VT100 6, 19 Duty cycle =Dtr ⎯2.5 2.6 V
Input current IDTC 6, 19 DTC1 =DTC2 =0.4 V −2.0 −0.6 ⎯µA
9.Overcurrent
protection circuit
block
[OCP1, OCP2]
ILIM terminal input
current ILIM 5, 20 RT=24 kΩ, CT=100 pF 99 110 121 µA
Offset voltage VIO 5, 20 ⎯⎯1* ⎯mV
10.Bias
voltage
block
[VH]
Output voltage VH2VCC =VCCO =7 V to 19 V
VH =0 mA to 30 mA
VCC−
5.5
VCC−
5.0
VCC−
4.5 V
11.Output block
[Drive1, Drive2]
Output source
current ISOURCE 3, 22
OUT1 to OUT4 =7 V,
Duty ≤5 %
(t =1/fOSC×Duty)
⎯−300 ⎯mA
Output sink current ISINK 3, 22
OUT1 to OUT4 =12 V,
Duty ≤5 %
(t =1/fOSC×Duty)
⎯350 ⎯mA
Output ON
resistor
ROH 3, 22 OUT1 =OUT2 =−45 mA ⎯8.0 12.0 Ω
ROL 3, 22 OUT1 =OUT2 =45 mA ⎯6.5 9.7 Ω
12.Control block
[CTL]
CTL input voltage VIH 24 IC Active mode 2 ⎯19 V
VIL 24 IC Standby mode 0 ⎯0.8 V
Input current
ICTLH 24 CTL =5 V ⎯50 100 µA
ICTLL 24 CTL =0 V ⎯⎯ 1µA
13.General
Standby current ICCS 1, 17 CTL =0 V ⎯010µA
Power supply
current ICC 1, 17 CTL =5 V ⎯4.0 6.0 mA

MB39A104
8
■TYPICAL CHARACTERISTICS
(Continued)
Ta =+25 °C
CTL =5 V
10
8
6
4
2
00 5 10 15 20
Ta =+25 °C
CTL =5 V
VREF =0 mA
10
8
6
4
2
0
0 5 10 15 20
Ta =+25 °C
VCC =12 V
CTL =5 V
10
8
6
4
2
0
0 5 10 15 20 25 30 35
VCC =12 V
CTL =5 V
VREF =0 mA
2.0
1.5
1.0
0.5
0.0
−0.5
−1.0
−1.5
−2.0
−40 −20 0 +20 +40 +60 +80 +100
Ta =+25 °C
VCC =12 V
VREF =0 mA
500
400
300
200
100
0
10
9
8
7
6
5
4
3
2
1
0
0 5 10 15 20
ICTL
VREF
Power supply current ICC (mA)
Reference voltage VREF (V)
Power Supply Current vs. Power Supply Voltage Reference Voltage vs. Power Supply Voltage
Power supply voltage VCC (V) Power supply voltage VCC (V)
Reference Voltage vs. Ambient Temperature
Reference voltage VREF (V)
Load current IREF (mA)
Reference voltage ∆VREF (%)
Reference Voltage vs. Load current
Ambient temperature Ta (°C)
CTL terminal current ICTL (µA)
CTL terminal Current vs. CTL terminal Voltage
CTL terminal voltage VCTL (V)
Reference voltage VREF (V)

MB39A104
9
(Continued)
Ta =+25 °C
VCC =12 V
CTL =5 V
CT=39 pF
10000
1000
100
10
CT=100 pF
CT=220 pF
CT=560 pF
1 10 100 1000
Ta =+25 °C
VCC =12 V
CTL =5 V
RT=11 kΩ
10000
1000
100
10
RT=24 kΩ
RT=68 kΩ
RT=130 kΩ
10 100 1000 1000
0
Ta =+25 °C
VCC =12 V
CTL =5 V
RT=47 kΩ
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
0 200 400 600 800 1000 1200 16001400
VCC =12 V
CTL =5 V
RT=24 kΩ
CT=100 pF
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
−40 −20 0 +20 +40 +60 +80 +100
VCC =12 V
CTL =5 V
RT=24 kΩ
CT=100 pF
560
540
520
500
480
460
440
−40 −20 0 +20 +40 +60 +80 +100
Triangular Wave Upper and Lower Limit Voltage
vs. Ambient Temperature
Triangular wave upper and
lower limit voltage VCT (V)
Ambient temperature Ta ( °C)
Triangular Wave Oscillation Frequency
vs. Timing Resistor
Triangular wave oscillation
frequency fOSC (kHz)
Timing resistor RT(kΩ)
Triangular Wave Oscillation Frequency
vs. Timing Capacitor
Triangular wave oscillation
frequency fOSC (kHz)
Timing capacitor CT(pF)
Triangular Wave Oscillation Frequency
vs. Ambient Temperature
Triangular wave oscillation
frequency fOSC (kHz)
Ambient temperature Ta ( °C)
Triangular wave upper and
lower limit voltage VCT (V)
Triangular Wave Upper and Lower Limit Voltage
vs. Triangular Wave Oscillation Frequency
Triangular wave oscillation frequency fOSC (kHz)
Ta =+25 °C
CTL =5 V
RT=24 kΩ
CT=100 pF
560
540
520
500
480
460
440
0 5 10 15 20
Triangular Wave Oscillation Frequency
vs. Power supply voltage
Triangular wave oscillation
frequency fOSC (kHz)
Power supply voltage VCC (V)
Upper
Lower
Upper
Lower

MB39A104
10
(Continued)
−
+
+
+
10
(15)
11
(14)
9
(16)
IN
OUT
Error Amp1
(Error Amp2)
1 µF
1.24 V
10 kΩ
2.4 kΩ
240 kΩ
10 kΩ
40
30
20
10
0
−10
−20
−30
−40
180
90
0
−90
−180
100 1 k 10 k 100 k 1 M 10 M
Ta =+25 °C
VCC =12 V
A V
ϕ
1000
800
600
400
200
0
740
−40 −20 0 +20 +40 +60 +80 +100
Error Amplifier, Gain, Phase vs. Frequency
Gain AV(dB)
Phase φ(deg)
Frequency f (Hz)
Power Dissipation vs. Ambient Temperature
Power dissipation PD(mW)
Ambient temperature Ta ( °C)