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PDF NJW4170U2-B Data sheet ( Hoja de datos )

Número de pieza NJW4170U2-B
Descripción Current Mode Control High Speed Frequency Internal 1A MOSFET Switching Regulator IC
Fabricantes New Japan Radio 
Logotipo New Japan Radio Logotipo



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NJW4170
Current Mode Control High Speed Frequency
Internal 1A MOSFET Switching Regulator IC for Buck Converter
GENERAL DESCRIPTION
The NJW4170 is a high speed oscillating frequency buck
converter with 40V/1A MOSFET. Current mode control and built-in
phase compensation circuit minimize external parts and contribute
to using a Low ESR Output Capacitor(MLCC) within wide input
range from 4.5V to 40V. Therefore, the NJW4170 can realize
downsizing of applications.
Also, it has a soft start function, an external clock synchronization
function, an over current protection and a thermal shutdown circuit.
Over 2MHz of Switching frequency can avoid interference with
the AM radio frequency.
It is suitable for supplying power to a Car Accessory, Audio
Automation Equipment, Industrial Instrument and so on.
FEATURES
Oscillating Frequency
2.4MHz typ. (A ver.)
2.1MHz typ. (B ver.)
Minimum ON time
80ns typ.(A ver.)
85ns typ.(B ver.)
Current mode Control
External Clock Synchronization
Wide Operating Voltage Range 4.5V to 40V
Switching Current
1.4A min.
PWM Control
Built-in Compensation Circuit
Correspond to Ceramic Capacitor (MLCC)
Soft Start Function
4ms typ.
UVLO (Under Voltage Lockout)
Over Current Protection (Hiccup type)
Thermal Shutdown Protection
Standby Function
Package Outline
NJW4170U2 : SOT-89-5
NJW4170KV1 : DFN8-V1(ESON8-V1)
PACKAGE OUTLINE
NJW4170U2
NJW4170KV1
PRODUCT CLASSIFICATION
Part Number
Version
NJW4170U2-A
A
NJW4170KV1-A
A
NJW4170U2-B
B
Oscillating
Frequency
2.4MHz typ.
2.4MHz typ.
2.1MHz typ.
Package
SOT-89-5
DFN8-V1
(ESON8-V1)
SOT-89-5
Operating
Temperature Range
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
General Spec.
-40 C to +125 C
Ver.2016-01-25
-1-

1 page




NJW4170U2-B pdf
NJW4170
ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
(Unless otherwise noted, V+=VEN/SYNC=12V, Ta=25 C)
TEST CONDITION
MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
VT_ON
VT_OFF
VHYS
V+= L H
V+= H L
Soft Start Block
Soft Start Time
tSS VB=0.75V
Oscillator Block
Oscillating Frequency
Oscillating Frequency
(Low Frequency Control)
Oscillating Frequency
deviation (Supply voltage)
Oscillating Frequency
deviation (Temperature)
fOSC
fOSC_LOW
fDV
fDT
A version, VIN-=0.7V
B version, VIN-=0.7V
A version, VIN-=0.2V
B version, VIN-=0.2V
V+=4.5 to 40V
Ta= -40 C to +85 C
Error Amplifier Block
Reference Voltage
Input Bias Current
PWM Comparate Block
Maximum Duty Cycle
Minimum ON Time1
(Use Built-in Oscillator)
Minimum ON Time2
(Use Ext CLK)
VB
IB
MAXDUTY
tON-min1
tON-min2
A, B version, VIN-=0.7V
A version
B version
A version, fSYNC =2.6kHz
B version, fSYNC =2.3kHz
4.2 4.35 4.5
V
4.11 4.26 4.41 V
70 90
– mV
2.5 4
8 ms
2.2 2.4 2.6 MHz
1.9 2.1 2.3 MHz
– 340 – kHz
– 290 – kHz
– 1 –%
– 5 –%
-1.0% 0.8 +1.0% V
-0.1 – +0.1 A
77.5 82
–%
– 80 115 ns
– 85 120 ns
– 80 115 ns
– 85 120 ns
Ver.2016-01-25
-5-

5 Page





NJW4170U2-B arduino
TYPICAL CHARACTERISTICS (B version)
Oscillating Frequency vs. Supply Voltage
2.4 (B ver., VIN-=0.7V, Ta=25ºC)
2.3
2.2
2.1
2
1.9
1.8
0
10 20 30
Supply Voltage :V+ (V)
40
Minimum ON Time1 vs. Temperature
(B ver., V+=12V)
120
110
100
90
80
70
60
50
40
-50 -25
0 25 50 75 100 125 150
Temperature : (ºC)
NJW4170
Oscillating Frequency vs Temperature
2.4 (B ver., V+=12V, VIN-=0.7V)
2.3
2.2
2.1
2
1.9
1.8
-50 -25
0 25 50 75 100 125 150
Temperature : (ºC)
Ver.2016-01-25
- 11 -

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