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NJW4170U2-A Dataheets PDF



Part Number NJW4170U2-A
Manufacturers New Japan Radio
Logo New Japan Radio
Description Current Mode Control High Speed Frequency Internal 1A MOSFET Switching Regulator IC
Datasheet NJW4170U2-A DatasheetNJW4170U2-A Datasheet (PDF)

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,.

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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- NJW4170 PIN CONFIGURATION EN/SYNC 1 GND 2 IN- 3 5 V+ (2) GND 4 SW NJW4170U2 SW N.C. V+ N.C. 1 2 3 4 (Top View) 8 IN7 N.C. 6 GND 5 EN/SYNC 8 7 6 5 1 2 3 4 Exposed PAD on backside connect to GND. (Bottom View) NJW4170KV1 PIN DESCRIPTIONS PIN NAME PIN NUMBER SOT-89-5 DFN8-V1 (ESON8) EN/SYNC 1 5 GND IN- SW V+ N.C. Exposed PAD 2 3 4 5 – – 6 8 1 3 2, 4, 7 – FUNCTION Standby Control pin The EN/SYNC pin internally pulls down with 100k . Normal Operation at the time of High Level. Standby Mode at the time of Low Level or OPEN. Moreover, it operates by inputting clock signal at the oscillatory frequency that synchronized with the input signal. GND pin Output Voltage Detecting pin Connects output voltage through the resistor divider tap to this pin in order to voltage of the IN- pin become 0.8V. Switch Output pin of Power MOSFET Power Supply pin for Power Line Non connection Connect to GND (Only DFN8-V1 PKG) -2- Ver.2016-01-25 NJW4170 BLOCK DIAGRAM EN/SYNC High: ON Low : OFF(Standby) 100k IN- UVLO Enable (Standby) SYNC SLOPE COMP. OSC Soft Start Vref 0.8V ER AMP V+ CURRENT SENSE OCP PWM SQ R Buf f er TSD SW GND Ver.2016-01-25 -3- NJW4170 ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER Supply Voltage V+.


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