GS7253-ASO-R

NIKO-SEM 5V/12V Single Synchronous Buck Controller Features GS7253-ASO-R General Description  300KHz Constant Switching Frequency The GS7253-A is a single buck controller working in  VBAT Rang= 4.5V~13.2V a voltage mode with fixed 300 kHz frequency. It  Support 0.6V Internal Reference Voltage allows wide input voltage which is either a single  0-80% Duty Cycle 5~12V  3.6ms Digital Soft-Start Circuit Built-In applications, and the output voltage can be  Short Circuit Protection precisely regulated to as low as 0.6V with a  Under Voltage Protection and Over Voltage maximum tolerance of ±1.0%. Protection The  Flexible Over Current Protection Setting current-limit, under-voltage output and over-voltage  Thermal Fault Protection output protections. Otherwise, It includes internal  Integrated Bootstrap Diode 3.6ms digital soft-start and built-in bootstrap diode  PSOP-8 package to simplify the circuit design.  Green Product (RoHS, Lead-Free, The GS7253-A is available in a simple PSOP-8 Halogen-Free Compliant) Package. or two GS7253-A supply is voltages equipped for with various accurate Applications  Mother Board  Graphic cards  Cable Modems, Set Top Boxes, and Xdsl Supplies  Low cost PC Typical Application Figure 1 Typical Application of GS7253-A This document is NIKO-SEM's confidential information. Anyone having confidential obligation to NIKO-SEM shall keep this document confidential. Any unauthorized disclosure or use beyond authorized purpose will be considered as violation of confidentiality and criminal and civil liability will be asserted. Rev.:0P11 (Preliminary Specification) 1 Jan-12 NIKO-SEM 5V/12V Single Synchronous Buck Controller GS7253-ASO-R Function Block Diagram Error AMP Error AMP Error AMP Error AMP Figure 2 Function Block Diagram Pin Configuration 8 7 6 5 1 2 3 4 Figure 3 PSOP-8 Package ( Top view ) Rev.:0P11 (Preliminary Specification) 2 Jan-12 NIKO-SEM 5V/12V Single Synchronous Buck Controller GS7253-ASO-R Pin Descriptions No. PSOP-8 Name I/O Pin Function type This pin provides the bootstrap voltage to the high-side gate driver for 1 BOOT O driving the N-channel MOSFET. An external capacitor from PHASE to BOOT, an internal diode, and the power supply voltage VCC, generates the bootstrap voltage for the high-side gate driver (UGATE). 2 UGATE O 3 OCSET I 4 LGATE O High-side Gate Driver Output. This pin is the gate driver for high-side MOSFET. Connecting a resistor (ROCSET) between OCSET and GND sets the over-current trip point. This pin is the gate driver for low-side MOSFET Power Supply Input for Control Circuitry. Connect a well-decoupled 5V/12V 5 VCC I supply voltage to this pin. Ensure that a decoupling capacitor is placed near the IC 6 FB I Feedback Input of Converter. Connecting FB with a resistor-divider from the output sets the output voltage of the converter. The Output of the error amplifier. Pulling this pin lower than 0.3V disables 7 COMP/EN O the controller. Use this pin in combination with the FB pin to compensate the voltage mode loop of the converter. Connect this pin to the source of the upper MOSFET and the drain of the 8 PHASE O lower MOSFET. This pin is used as the sink for the UGATE driver, and to monitor the voltage drop across the lower MOSFET for over current protection. 9 GND (Exposed Pad) I Signal and Power ground. Connecting this pin to system ground. Rev.:0P11 (Preliminary Specification) 3 Jan-12 NIKO-SEM 5V/12V Single Synchronous Buck Controller GS7253-ASO-R Ordering Information GS7253 –A PP- R 4. Shipping 1. Product name 2. For AMD 3. Package No Item Contents 1 Product name 2 For AMD -A 3 Package SO: PSOP-8 4 Shipping R: Tape & Reel GS7253 Example: GS7253-A PSOP-8 Tape & Reel ordering information is “GS7253-ASO-R” Absolute Maximum Rating (Note 1) Parameter Symbol Limits Units VSUPPLY -0.3 ~ 18 V VBOOT-GND -0.3 ~ 36 V BOOT to PHASE Voltage VBOOT-PHASE -0.3 ~ 18 V UGATE to PHASE Voltage VGU -0.3 ~VBOOT+0.3 V LGATE to GND Voltage VGL -0.3 ~ VVCC+0.3 V -0.3 ~ 18 (>200ns) V -2~ 28 (