NJW4801

NJW4801
Small PKG Half Bridge Driver
■ PACKAGE OUTLINE
 GENERAL DESCRIPTION
The NJW4801 is a general purpose, half bridge power driver
capable of supplying 450mA current.
The internal gate driver drives high-side/low-side power
MOSFET, therefore, it has fast switching.
Additionally, it has protection features such as over current
protection and thermal shutdown. And in the case of failure, it can
output a fault flag.
It is suitable for power switching applications of DSP/micro
controller.
NJW4801R
 FEATURES
 Output Switch Current
450mA
 Operating Voltage
8.0V to 35V
 High-side and Low-side SW is available independently-function
 Up to 700kHz Switching Frequency
 Thermal Shut Down
 Over Current Protection
 Under Voltage Lockout
 Fault Indicator Output
 Stand-by Current
IQSTBY =3A (typ.)
 Package Outline
MSOP8 (VSP8)*
* MEET JEDEC MO-187-DA
 PIN CONFIGURATION
1
8
2
7
3
6
4
5
1. STBY
2. IN1
3. IN2
4. FLT
5. GND
6. OUT2
7. OUT1
8. VDD
NJW4801R
Ver.2014-02-05
-1-
NJW4801
 BLOCK DIAGRAM
Under Voltage
Lock Out
FLT
VDD
Thermal
Shut Down
Ov er Current
Protection
OUT1
OUT2
IN1
Control
Logic
IN2
GND
STBY
-2-
Ver.2014-02-05
NJW4801
 ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
V+
Input Voltage
VSTBY
VIN1
Input Voltage
VIN2
FLT pin Voltage
VFLT
Power Dissipation
PD
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
Tj
Topr
Tstg
(Ta=25°C)
REMARKS
VDD-GND Pin
STBY-GND Pin
MAXIMUM RATINGS
40
0.3 to 6
UNIT
V
V
0.3 to 6
V
IN1/2-GND Pin
0.3 to 6
595 (*1)
805 (*2)
40 to 150
40 to 85
50 to 150
V
FLT-GND Pin
mW
–
C
C
C
–
–
–
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*2): 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
PARAMETER
SYMBOL
MIN.
Operating Voltage
Vopr
8
Output Switch Current
IOM
0
Input Voltage
VSTBY
0
Input Voltage
VIN1, VIN2
0
FLT pin Voltage
VFLT
0
 THERMAL CHARACTERISTICS
PARAMETER
SYMBOL
Thermal Resistance between
Tj and Ta
Thermal Resistance between
Tj and TC1
ja
jt
TYP.
–
–
–
–
–
MAX.
35
450
5.5
5.5
5.5
UNIT
V
mA
V
V
V
(Ta=25°C)
REMARKS
VDD-GND Pin
OUT-GND Pin
STBY-GND Pin
IN1/2-GND Pin
FLT-GND Pin
(Ta=25°C)
UNIT
THERMAL RESISTANCE
210 (*1)
155 (*2)
33 (*1)
25 (*2)
C/W
C/W
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers),
internal Cu area: 74.2×74.2mm
Power Dissipation vs. Ambient Temperature
o
At on 4 layer PC Board
At on 2 layer PC Board
800
Power Dissipation P
D
(mW)
o
(Topr=-40~+85 C, Tj= ~150 C)
1000
600
400
200
0
0
Ver.2014-02-05
25
50
75
Ambient Temperature Ta (oC)
100
-3-
NJW4801
(Unless other noted, V+=12V, VSTBY=0V, Ta=25C)
 ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNIT
–
1
1.4
mA
–
3
4
mA
–
2.9
4
A
–
–
600
0.65
0.65
1200
1
1
1800


mA
–
5
–
ns
–
5
–
ns
–
50
–
ns
–
100
–
ns
–
100
–
ns
–
–
–
–
–
–
0.87
0.82
0.96
1.13
–
–
1.22
1.15
1.25
1.46
1
1
V
V
V
V
A
A
Input Circuit Block
STBY pin High Voltage (Standby Mode)
VIHSTBY
STBY pin Low Voltage(Operating Mode)
VILSTBY
STBY Pin Sink Current
IISTBY
VSTBY=1V
IN1/IN2 Pin High Voltage
VIHIN1, VIHIN2
IN1/IN2 Pin Low Voltage
VILIN1, VILIN2
IN1/IN2 Pin Sink Current
IIIN1, IIIN2
VIN1, VIN2=5.5V
2.4
0
1
2.4
0
–
–
–
2
–
–
–
5.5
0.4
4
5.5
0.9
1
V
V
A
V
V
A
Under Voltage Lockout (UVLO) Block
UVLO Release Voltage
UVLO Operation Voltage
UVLO Hysteresis Voltage
VUVLO2
VUVLO1
ΔVUVLO
VUVLO2-VUVLO1
6.4
6
–
7.1
6.7
0.4
7.8
7.4
–
V
V
V
FLT Function (FLT pin)
Low Level Output Voltage
OFF Leak Current
VLFLT
IOLEAKFLT
IFLT=500A
VFLT=5.5V
–
–
0.25
–
0.5
1
V
A
General Characteristics
Quiescent Current 1 (Operating)
IQ1
Quiescent Current 2 (Switching)
IQ2
Quiescent Current 3 (Standby)
IQOFF
Output Block
High-side SW ON Resistance (OUT1)
Low-side SW ON Resistance (OUT2)
Over Current Limit
RDSH
RDSL
ILIMIT
Turn-on Time
tr
Turn-off Time
tf
Dead Time
Dt
Output Rise Propagation Delay Time
td_ON
Output Fall Propagation Delay Time
td_OFF
OUT1–VDD pin voltage Difference
GND–OUT2 pin Voltage Difference
OUT2–VDD pin Voltage Difference
OUT1–GND pin Volatge Difference
OUT1 Pin Leak Current
OUT2 Pin Leak Current
VPDOV
VPDGO
VRDOV
VRDGO
IOLEAK1
IOLEAK2
-4-
TEST CONDITIONS
VIN1=VIN2=0V
VIN1=VIN2=0 to 3V,
fPWM1=fPWM2=700kHz,
50% Duty Cycle
VSTBY=5V, VIN1=VIN2=0V
IOSOURCE=450mA
IOSINK=450mA
High-side and Low-side
VIN1=VIN2=0 to 3V,
OUT1-OUT2 pin is short
VIN1=VIN2=0 to 3V,
OUT1-OUT2 pin is short
VIN1=VIN2=0 to 3V,
OUT1-OUT2 pin is short
VIN1=VIN2=0 to 3V,
OUT1-OUT2 pin is short
VIN1=VIN2=0 to 3V,
OUT1-OUT2 pin is short
IORH=450mA
IORL=450mA
IORH=450mA
IORL=450mA
V+=35V, VIN1=0V, VOUT1=0V
V+=35V,VIN2=3V,VOUT2=35V
Ver.2014-02-05
NJW4801
 PIN OPERATION TABLE
INPUT
IN1
IN2
L
L
H
H
L
H
L
H
OUTPUT
High-side SW
Low-side SW
(OUT1)
(OUT2)
OFF
ON
OFF
OFF
ON
ON
ON
OFF
INPUT
IN1, IN2
STBY
VDD
FLT
L or H
L or H
L or H
L
H
L
V+  VRUVLO
–
+
V  VDUVLO
ON
OFF
OFF
INPUT
Tj
IOUT
FLT
Tj 150C
–
–
IOUT  ILIMIT
OFF
OFF
Ver.2014-02-05
OUTPUT
High-side SW
(OUT1)
OFF or ON
OFF
OFF
OUTPUT
High-side SW
(OUT1)
OFF
OFF
Low-side SW
(OUT2)
OFF or ON
OFF
OFF
Low-side SW
(OUT2)
OFF
OFF
Mode
Active
Stand-by
UVLO
Mode
TSD
OCP
-5-
NJW4801
■ TIMING CHART
Fig1. Turn-on/Turn-off Time, Output Rise/Fall Propagation Delay Time
50%
50%
IN
tr
tf
90%
90%
50%
OUT
50%
10%
10%
td_ON
td_OFF
 TEST CIRCUIT
V
+
CP=0.1F CIN=10F

Stand-by
STBY
VDD
OUT1
FAULT
FLT
NJW4801
OUT
IN1
IN
OUT2
IN2
GND
Fig2. Switching time Measurement Circuit
-6-
Ver.2014-02-05
NJW4801
 TYPICAL APPLICATIONS
V
+
CP=0.1F CIN=10F
VDD
STBY
Stand-by
OUT1
FLT
FAULT
VOUT
NJW4801
PWM
Controller
(NJU7600)
IN1
PWM Signal
OUT2
IN2
GND
Synchronous PWM step down switching regulator
V
+
CP=0.1F CIN=10F
Stand-by
STBY
VDD
RL
VOUT
OUT1
FLT
FAULT
NJW4801
IN1
Micro
Controller
IN2
Contorol Signal
OUT2
GND
RL :Load
ex. Mortor,Solenoid,Lamps
High Side SW and Low Side SW application
Ver.2014-02-05
-7-
NJW4801
 CHARACTERISTICS
Quiescent Current1 vs.Ambient Temperature
Quiescent Current1 vs.Supply Voltage
+
V =12V, VSTBY=0V
Ta=25ºC, VSTBY=0V
2
1.4
1.2
1.6
Quiescent Current1 [mA]
Quiescent Current1 [mA]
1.8
1.4
1.2
1
0.8
0.6
0.4
1
0.8
0.6
0.4
0.2
0.2
0
0
0
10
20
30
Supply Voltage [V]
40
-50
-25
Quiescent Current2 vs.Ambient Temperature
Quiescent Current2 vs.Supply Voltage
+
V =12V, VSTBY=0V
Ta=25ºC, VSTBY=0V
10
4
9
3.5
8
Quiescent Current2 [mA]
Quiescent Current2 [mA]
0
25
50
75 100 125 150
Ambient Temperature [ºC]
7
6
5
4
3
2
3
2.5
2
1.5
1
0.5
1
0
0
0
10
20
30
Supply Voltage [V]
-50
40
-25
0
25
50 75 100 125 150
Ambient Temperature [ºC]
Quiescent Current3 vs.Ambient Temperature
Quiescent Current3 vs.Supply Voltage
+
V =12V, VSTBY=5V
Ta=25ºC, VSTBY=5V
10
20
Quiescent Current3 [μA]
Quiescent Current3 [μA]
9
15
10
5
8
7
6
5
4
3
2
1
0
0
0
-8-
10
20
30
Supply Voltage [V]
40
-50
-25
0
25
50
75 100 125 150
Ambient Temperature [ºC]
Ver.2014-02-05
NJW4801
 CHARACTERISTICS
High/Low Side SW ON Resistnce
vs. Ambient Temperature
Over Current Limit
vs. Ambient Temperature
+
+
V =12V, VSTBY=0V
V =12V, VSTBY=0V
1.2
1.6
IOSOURCE/IOSINK=450mA
1.4
High Side SW
Low Side SW
0.8
High Side SW
0.6
0.4
0.2
Limiting Current [A]
High/Low Side SW
ON Resistnce [Ω]
1
1.2
1
0.8
Low Side SW
0.6
0.4
0.2
0
0
-50
-25
0
25
50
75 100 125 150
Ambient Temperature [ºC]
-50
Turn-on/Turn-off Time
vs. Ambient Temperature
-25
Output Rise/Fall Propagation Delay Time
vs. Ambient Temperature
+
+
V =12V, VSTBY=0V
V =12V, VSTBY=0V
10
120
VIN1=VIN2=0 to 3V
OUT1-OUT2 Terminal Shorten
8
Fall Time
6
4
2
Rise Time
0
VIN1=VIN2=0 to 3V
OUT1-OUT2 Terminal Shorten
115
Output Rise/Fall Propagation
Delay Time [nS]
Turn-on/Turn-off Time [nS]
0
25
50 75 100 125 150
Ambient Temperature [ºC]
Rise Delay Time
110
105
100
Fall Delay Time
95
90
85
80
-50
-25
0
25
50
75 100 125 150
Ambient Temperature [ºC]
-50
-25
0
25
50
75 100 125 150
Ambient Temperature [ºC]
UVLO Operating/Release Voltage
vs. Ambient Temperature
+
V =12V, VSTBY=0V
UVLO Operating/Release Voltage [V]
10
9
8
Release Voltage
7
6
Operating Voltage
5
-50
Ver.2014-02-05
-25
0
25
50
75 100 125 150
Ambient Temperature [ºC]
-9-
NJW4801
NJW4801 Application Manual
 PIN DESCRIPTION
PIN
PIN NAME
NUMBER
- 10 -
1
STBY
2
IN1
3
IN2
4
FLT
5
GND
6
OUT2
7
OUT1
8
VDD
FUNCTION
Standby Pin
NJW4801 becomes standby status by High Level
NJW4801 operates by Low Level
Signal Input Pin for High-side SW
High-side SW turns on at High level and High-side SW turns off at Low level.
IN1 and IN2 operate with inverse logic.
Signal Input Pin for Low-side SW
Low-side SW turns off at High level and Low-side SW turns on at Low level.
IN1 and IN2 operate with inverse logic.
Fault Signal Output Pin.
It is Open Drain Output Type. You should connect through Pull-up Resister to
External Power Supply.
It outputs Low Level under normal operating condition and outputs High Level
under Abnormal Conditions.
Ground Pin
Output Pin
The Low-side Switch are Limited to 1.2A (typ.) by Over Current Protection
Circuit.
Output Pin
The High-side Switch are Limited to 1.2A (typ.) by Over Current Protection
Circuit.
Power Supply Pin
You should connect capacitor (AL and MLCC) for reducing Input Impedance.
Ver.2014-02-05
NJW4801 Application
Manual
NJW4801
 FUNCTIONAL EXPLANATION
 High-side, Low-side Switch
The OUT1 pin is High-side SW output. The OUT2 pin is Low-side SW output. These SW are controlled by IN1 and IN2,
so it can be operated independently.
ON
High Side
The High-side SW turns on when IN1 pin voltage is more than
SW
2.4V and turns off when IN1 pin voltage is less than 0.9V. The
OFF
Low-side SW turns off when IN2 pin voltage is more than 2.4V and
ON
turns on when IN2 pin voltage is less than 0.9V.
Low Side
SW
Because IN1 and IN2 are inverse logic input, the half bridge
OFF
application with one input signal can be easily composed.
Dead Time 50ns typ.
In this case, OUT1 and OUT2 pin can be used as short-circuit.
Fig3. Relation of SW Function and Dead Time
NJW4801 has dead time to prevent the short circuit at the time of
operation change of the high side and the low side SW. (ex. Fig3) The dead time typical value is 50ns. This can be used
for the application of the switching regulator that needs the high frequency. As for input frequency, you should make less
than 700kHz.
 Over Current Protection Function
The internal over-current protection circuit monitors the flow currents of both the high-side and low-side switches. The
over-current protection circuit operates at 1.2A (typ.) and stops the both SW operation. The FLT detection signal is output
from FLT pin at the same time. The overcurrent protection operation is released after certain time (20s (typ)), after
overcurrent protection operates. (Ex. Fig4)
If OUT pin is shorted directly to GND, a large surge current is flowing for fast current change and may exceed current
limit. Because that time big electric power consumption occurs instantaneously in NJW4801, you should design sufficient
heat dissipation.
When a load condition is inductive property, a reverse direction current flows to the high-side and low-side SW body
diode by inductive kickback. The built-in over-current protection circuit has not aimed at protection against the inductive
kickback. Therefore, an external diode should be considered usage against reverse-current regeneration according to
the kind of the application.
After OCP operates, the OCP is released after a certain time (20μs (typ.))
High
IN1, IN2
Low
ON
High Side SW
OFF
ON
Low Side SW
OFF
High Side SW ON
Current Limit
OFF
*3
Tj > 150C (typ.) *3
ON
Low Side SW
Current Limit OFF
Fault Output
(FLT pin Pull-Up)
*3
High
Low
OCP
TSD
OCP
*3: When the thermal shutdown protection or the over current protection operates, both High-side and Low-side SW are turned off.
Fig4. Timing Chart of High-side/Low-side Switch at Over Current Protection Operating
(In case of IN1 and IN2 signal are same)
Ver.2014-02-05
- 11 -
NJW4801
NJW4801 Application Manual
 Thermal Shut Down Function
When NJW4801 chip temperature exceeds the 170°C (*4), internal thermal shutdown circuit operates and SW
function is stopped. The Fault signal is output simultaneously from the FLT pin. In order to return switching operation, you
should need to junction temperature: Tj below the 150C (*4).
This function is a circuit to prevent IC at the high temperature from malfunctioning and is not something that urges
positive use. You should make sure to operate inside the junction temperature range rated. (*4 Design value)
 Under Voltage Lockout(UVLO)
The UVLO circuit operating is released above V+=7.1V (typ.) and IC operation starts. When power supply voltage is
low, because the UVLO circuit operates, IC does not operate. There is 0.4V (typ.) width hysteresis voltage at rise and
decay of power supply voltage. Hysteresis prevents the malfunction at the time of UVLO operating and releasing.
 FAULT Signal Output
When NJW4801 function is abnormal, an error signal is output from FLT Pin. This Pin is Open Drain Output Type. You
should connect through Pull-up Resister to External Power Supply. It outputs Low Level under normal operating condition
and outputs High Level under Abnormal Conditions.
The following information is output as FAULT signal.
・Stop Operation at Under Voltage Lockout (UVLO)
・Over Current Protection Function
・Thermal Shut Down
At the time of standby state, it outputs High Level.
 Standby Function
NJW4801 stops the operating and becomes standby status when 2.4V or more is supplied to STBY pin.
You should connect the pin with GND level to prevent the malfunction by a noise when you do not use this function.
 APPLICATION TIPS
In the application that does a high-speed switching of NJW4801, because the current flow corresponds to the input
frequency, the substrate (PCB) layout becomes an important.
NJW4801 is driving the High-side/Low-side SW gate with high speed to reduce switching losses. The transient voltage
is generated by parasitic inductance and a high-speed current change of high side and low side SW.
You should attempt the transition voltage decrease by making a current loop area minimize as much as possible.
Therefore, you should make a current flowing line thick and short as much as possible.
Moreover, you should insert a bypass capacitor between VDD pin and GND pin to prevent malfunction by generating
over voltage and/or exceed maximum input voltage rating. The recommended bypass capacitor is 0.1F or more high
frequency capacitor.
A 10F aluminum electrolysis capacitor is recommended for smoothing condenser. However, you should use larger
capacitor by sufficient evaluation (assessment) due to load condition and/or application use environment. (There is a
possibility that the supply voltage rises by inductive kickback when the supply current of the inductive load is large.)
The bypass capacitors should be connected as much as possible near VDD pin.
- 12 -
Ver.2014-02-05
NJW4801
MEMO
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Ver.2014-02-05
- 13 -