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SP6136
Synchronous Buck Controller
IN
FEATURES ■ 5V to 24V Input step down converter ■ Up to 7A output in a small form factor ■ Highly integrated design, minimal components GL ■ UVLO Detects Both VCC and VIN PGND ■ Overcurrent circuit protection with auto-restart ■ Power Good Output, ENABLE Input ■ Maximum Controllable Duty Cycle Ratio up to 92% GND ■ Wide BW amp allows Type II or III compensation VFB ■ Programmable Soft Start ■ Fast Transient Response ■ Available in Lead Free, RoHS Compliant 16-Pin QFN package ■ External Driver Enable/Disable ■ U.S. Patent #6,922,041
16 1 2 3 4
15
14
BST 13 12 GH 11 10 9
VCC
SP6136
16 Pin QFN 3mm x 3mm
UV
VI N
SWN ISP ISN
5 COM P
6 EN
7 PWRGD
VIN
CIN 22uF
8 SS
DESCRIPTION The SP6136 is a synchronous step-down switching regulator controller optimized for high efficiency. The part is designed to be especially attractive for single supply step down conversion from 5V to 24V. The SP6136 is designed to drive a pair of external NFETs using a fixed 600 KHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown, output short circuit protection, and overcurrent protection with auto restart. The device also features a PWRGD output and an enable input. The SP6136 is available in a space saving 16-pin QFN and offers excellent thermal performance. TYPICAL APPLICATION CIRCUIT
C3 0.1uF DBST CVCC 4.7uF SD101AWS VIN VCC R5 POWERGOOD NC EN ENABLE 10kΩ PWRGD SWN UVIN MB, Si4886DY 13.5 mΩ, 30V GL RS3 10KΩ ISP PGND ISN COMP VFB CP1 12 pF CZ3 270pF CF1 22pF CZ2 560pF RZ2 30.9kΩ SS CSS 47nF RZ3 1kΩ R2 21.5kΩ, 1% CSP 6.8nF CS 0.1uF R1 68.1kΩ, 1% BST GH Inter-Technical SC7232-2R2 2.2uH, 13A, 10.4mΩ CBST 0.1uF MT, Si4354DY 18.5 mΩ, 30V
12V
GND
VOUT
COUT 100uF
SP6136
RS1 5.11KΩ
RS2 5.11KΩ
GND
3.3V 0-7A
GND
Note: Die attach paddle is internally connected to GND.
Oct 31-06 Rev L SP6136 Synchronous Buck Controller © 2006 Sipex Corporation
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC .................................................................................................. 6V VIN .............................................................................................. 24.5V BST. ................................................................................................ 30V BST-SWN......................................................................................... 7V SWN.....................................................................................-2V to 24V GH...........................................................................-0.3V to BST+0.3V GH-SWN. ......................................................................................