Document
Automotive NJW4141
2 - phase Boost Converter Switching Regulator IC
GENERAL DESCRIPTION
The NJW4141 is a 2-phase boost converter switching regulator IC that operates wide input range from 3V to 40V.
It can optimize applications by external phase compensation and voltage mode control.
The digital phase shifter adds 180 degree phase shift signal to the PWM signal and controls boost circuit by 2-phase operation. The 2-phase operation reduces an input ripple current and realizes large output current applications.
It has a pulse-by-pulse over current protection circuit that limits an output current at over load. When recovering from abnormal load condition, switching operation restarts automatically.
The NJW4141 suitable for large output current application such as a boost power supply of audio amplifier and a boost application from battery unit.
■ PACKAGE OUTLINE NJW4141VC3-T1
FEATURES
2-phase Boost Converter Application
Correspond to Operating Temperature 125 C
Nch MOSFET Driving
Driving Voltage 5.1V typ.
Wide Operating Voltage Range 3V to 40V
PWM Control
Wide Oscillating Frequency
50kHz to 500kHz
Adjustable Soft Start Function
Dead Time Control
UVLO (Under Voltage Lockout)
Over Current Protection
Standby Function
Package Outline
NJW4141VC3-T1 : SSOP20-C3
Ver.2016-02-22
-1-
Automotive NJW4141
PIN CONFIGURATION
OUT1
1
SENSE1
2
REG_DRV1 3
PGND
4
AGND
5
VREG1.5 CT DTC
6 7 8
FB 9
IN- 10
(Top View)
20 OUT2 19 SENSE2 18 REG_DRV2 17 N.C. 16 V+ 15 ON/OFF 14 SS 13 VREG5 12 N.C. 11 RDIV_SW
NJW4141VC3-T1
BLOCK DIAGRAM
V+
ON/OFF
High: ON
Low : OFF(Standby)
400k
UVLO
Standby ON/OFF
2.5V Regulator
5V Regulator
Internal Pow er Supply
CT VREG1.5
IN-
1.5V Regulator
Vref 1V
OSC
Error AMP
CLOCK OSC
FB DTC SS
Max Duty Setting
Soft Start Setting
PWM Comparator
Digital Phase Shif ter
5V Regulator
RDIV_SW
VREG5
Pulse by
Pulse
Pulse by
Pulse
Driver 1 Over Current Sense 1
V IPK1
Driver 2 Over Current Sense 2
V IPK2
REG_DRV1 OUT1 SENSE1
REG_DRV2 OUT2 SENSE2
AGND
PGND
-2-
Ver.2016-02-22
Automotive NJW4141
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C)
PARAMETER Supply Voltage
SYMBOL V+
MAXIMUM RATINGS +45
UNIT V
OUT pin Voltage (*1) REG_DRV pin Voltage (*1) VREG1.5 pin Voltage VREG5 pin Voltage IN- pin Voltage DTC pin Voltage SENSE pin Voltage (*1) CT pin Voltage SS pin Voltage ON/OFF pin Voltage RDIV_SW pin Voltage
OUT pin Peak Current (1*)
Power Dissipation
Operating Temperature Range Storage Temperature Range
VOUT VREG_DRV VREG1.5
VREG5 VINVDTC VSENSE VCT VSS VON/OFF VRDIV_SW IO_PEAK+ IO_PEAK-
PD
Topr Tstg
-0.3 to +5.95 (*2)
-0.3 to +5.95 (*2)
+1.8 (*2)
+5.7 (*2)
+2.8 (*2)
+2.8 (*2) +2.8 (*2) +2.8 (*2) +2.8 (*2)
+45 +45 1,000 (Source) 900 (Sink) 1,000 (*3) 1,500 (*4) -40 to +125 -40 to +150
V V V V V V V V V V V
mA
mW
C C
(*1): Common to each channel.
(*2): When Supply voltage is less than each absolute maximum voltage, the absolute maximum voltage is equal to the
Supply voltage.
(*3): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*4): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers),
internal Cu area: 74.2×74.2mm
RECOMMENDED OPERATING CONDITIONS (Ta= -40 C to +125 C)
PARAMETER
SYMBOL
MIN.
TYP.
Supply Voltage
V+ 3 -
Timing Capacitor Oscillating Frequency
CT 270 - fOSC 50 -
MAX. 40
3,300 500
UNIT V pF kHz
Ver.2016-02-22
-3-
Automotive NJW4141
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
(Unless otherwise noted, V+=VON/OFF=12V, CT=470pF, Ta=25 C)
TEST CONDITION
MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage
VT_ON
OFF Threshold Voltage
VT_OFF
V+= L → H V+= L → H, Ta= -40 C to +125 C V+= H → L V+= H → L, Ta= -40 C to +125 C
2.65 2.8 2.95
2.65 – 2.95
2.4 2.55 2.7
2.35 –
2.8
V V
Oscillator Block Oscillating Frequency1
Oscillating Frequency2
Charge Current
Discharge Current Voltage amplitude Oscillating Frequency deviation (Supply voltage)
fOSC1
CT=470pF CT=470pF, Ta= -40 C to +125 C
270 260
300 –
330 330
kHz
fOSC2
CT=1,500pF CT=1,500pF, Ta= -40 C to +125 C
90 80
100 –
110 120
kHz
Ichg Ta= -40 C to +125 C
150 200 250 140 – 260
A
Idis Ta= -40 C to +125 C
150 200 250 140 – 260
A
VOSC
– 0.7 – V
fDV V+=3V to 40V
– 3 –%
Soft Start Block
Charge Current (SS pin)
Threshold Voltage (SS pin)
Threshold Voltage (SS pin)
Ichg_SS
Ta= -40 C to +125 C
1.6 2 2.4 1.6 – 2.4
VTHSS0
Duty1,2=0% Duty1,2=0%, Ta= -40 C to +125 C
0.41 0.39
0.49 –
0.57 0.59
VTHSS85
Duty1,2=80% Duty1,2=80%, Ta= -40 C to +125 C
0.92 0.87
1.1 –
1.28 1.33
A V V
Error Amplifier Block Reference Voltage
Input Bias Current Open Loop Gain Gain Bandwidth Output Source Current
Output Sink Current
VB Ta= -40 C to +125 C
IB Ta= -40 C to +125 C AV GB
VFB=1V, VIN-=0.9V IOM+ VFB=1V, VIN-=0.9V,
Ta= -40 C to +125 C VFB=1V, VIN-=1.1V IOM- VFB=1V, VIN-=1.1V, Ta= -40 C to +125 C
-1.0% -2.0%
1.00 +1.0% – +2.0%
V
-0.1 -0.1
– –
0.1 0.1
A
– 80 – dB
– 1.5 – MHz
40.