1

Rev. 7/16/03

SP6122 Low Voltage, Micro 8, PFET, Buck Controller

© Copyright 2003 Sipex Corporation

SP6122

■ Optimized for Single Supply, 3V - 5.5V Applications

■ High Efficiency, Greater than 90% Possible

■ Small Micro 8 Package

■ 20ns/1nF PFET Output Driver

■ Fast Transient Response

■ Open Drain Fault Output Pin

■ Internal Soft Start Circuit

■ Accurate 1.5% Reference

■ Programmable Output Voltage or Fixed 1.5V Output

■ Loss-less Adjustable Current Limit with High side

R

■ Hiccup or Lock-up Fault Modes

■ Low 5µA Sleep Mode Quiescent Current

■ Low 300µA Protected Mode Quiescent Current

■ Ultra Low, 150µA Unprotected Mode Quiescent

Current

■ High Light Load Efficiency

Low Voltage, Micro 8, PFET, Buck Controller

Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters

APPLICATIONS

■ Video Cards

■ High Power Portable

■ Microcontrollers

■ I/O & Logic

■ Industrial Control

■ Distributed Power

■ Low Voltage Power

DESCRIPTION

The SP6122 is a PFM minimum on-time controller designed to work from a single 5V or 3.3V

input supply. It is engineered specifically for size and minimum components count, simplifying

the transition from a linear regulator to a switcher solution. However, unlike other “micro”

parts, the SP6122 has an array of value added features like optional hiccup mode, over

current protection, TTL enable, “jitter and frequency stabilization” and a fault flag pull down

pin. Combined with reference and driver specifications usually found on more expensive

integrated circuits, the SP6122 delivers great performance and value in a micro 8 package.

®

1

2

3

4

5

6

7

8

ENABLE

FFLAG

PDRV

GND

SP6122

8 Pin µSOIC

SP6122

FFLAG

ENABLE

PDRV

GND

FFLAG

1k

DFLY

Q1

PDS6375

ENABLE

C1

4.7µF

3.0V to 7.0V

L1

2.2µH

470µF

1A to 5A

®

®

R1

5Ω

C2

100µF

STPS2L25U

FEATURES

TYPICAL APPLICATION CIRCUIT