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OCP2020
Switching Buck Regulator General Description
The OCP2020 is a buck topology of switching regulator for wide operating voltage applications field. The OCP2020 includes a high current P-MOSFET, high precision reference (0.5V) for comparing output voltage with feedback amplifier, an internal dead-time control and oscillator for controlling the maximum duty cycle and PWM frequency, and has power-on programmable soft start time and short circuit PMOS turn-off and auto re-start protection functions.
Features
Precision feedback reference voltage: 0.5V (2%) Wide supply voltage operating range: 3.6 to 20V Low current consumption: 3mA Internal fixed oscillator frequency: Typ. 340KHz Programmable Soft-Start function (SS) Short Circuit Shutdown and Auto Re-start function(ARSCP) Built-in P-MOSFET for 2A loading capability Over Current Protection Package: SOP8
Pin Configuration
Top View
1 2 3 4 OCP2020 8 7 6 5
Name VCC SS/SCP INFB GND LX
No. 1 2 3 4 5 6 7 8
Status P I I O P O
Description IC Power Supply (PMOS Source) Connecting with a Soft-start & ARSCP timing capacitor Error Amplifier Inverting Input Error Amplifier Compensation Output
IC Ground
PMOS High Current Output
Block Diagram
VCC 1
Reference Regulator 1.25V
Oscillator Thermal Shuntdown
IN- 3
36K 500 0.5V 0.8V
Output drive control circuits
FB 4 Soft start&Auto Re-start S.C.P Circuits Over Current Protection
5 GND
6 GND
2 SCP
7 LX
8 LX
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Contact Information: For more detail information , please direct any inquiries and/or comments to [email protected].
Rev.1.3 Mar.17, 2008