NJW4170 Series

Current Mode Control High Speed Frequency Internal 1A MOSFET Switching Regulator IC for Buck Converter

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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.

Spec

	Consumer
Input Voltage Range	4.5 V to 40 V (45 V)
Operating Temperature Range	-40°C to 125°C
Supply Current	Typ. 2000 µA
Standby Current	1 (max.) µA
Output Voltage Range	0.8 V to 31 V
Output Voltage Accuracy	± 1 %
Output Current	1000 mA
Oscillator Frequency	2.4MHz typ. (A ver.)2.1MHz typ. (B ver.)
Package	SOT-89-5-2 DFN8-V1(ESON8-V1)
Control	Current mode Control / PWM Control
Function	Standby Function Soft Start Function (4ms typ.) Over Current Protection (Hiccup type) Thermal Shutdown Protection
Note	Built-in Compensation Circuit UVLO (Under Voltage Lockout) External Clock Synchronization Correspond to Ceramic Capacitor (MLCC)

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TSD	ILX	OCP	OVP	UVLO	OVLO	Reverse	Shutdown	Soft Start	SSCG	PGOOD	Auto Discharge	Anti-ringing	Sequencing	Max Duty	Ext. Phase	LED Adjust

Functional Description

Quality &
Packages

Product Name	Package	Marking	Reliability
NJW4170U2-A	SOT-89-5-2	-	NJW-1-s-fr
NJW4170U2-B	SOT-89-5-2	-	NJW-1-s-fr
NJW4170KV1-A	DFN8-V1(ESON8-V1)	-	NJW-1-s-r

Refer to the datasheets for the details on the product.
The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

TSD	Thermal Shutdown Function
ILX	LX Current Limit Function
OCP	Overcurrent Protection
OVP	Overvoltage Protection
UVLO	Undervoltage Lockout Protection
OVLO	Overvoltage Lockout Protection
Reverse	Reverse Current Protection Circuit
Shutdown	Shutdown Function
Soft Start	Soft Start Function
SSCG	Spread Spectrum Clock Generator Function
PGOOD	Power Good Output
Auto Discharge	Auto Discharge Function
Anti-ringing	Anti-ringing Switch Function
Sequencing	Start-up Sequencing Control
Max Duty	Maximum Duty Cycle
Ext. Phase	Externally Adjustable Phase Compensation
LED Adjust	LED High-speed Dimming Control