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Date: 10/02/04

SP6122 Low Voltage, Micro 8, PFET, Buck Controller

© Copyright 2004 Sipex Corporation

SP6122

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

■ High Efficiency, Greater than 90% Possible

■ 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

■ Offered in Tiny 8 pin MSOP Package

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 PWM/PFM minimum on-time controller designed to work from a single 3V-

5.5V input supply. It is engineered specifically for size and minimum component 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 such as 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 an 8 pin

MSOP package.

®

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

TYPICAL APPLICATION CIRCUIT

1

2

3

4

5

6

7

8

SP6122

8 Pin MSOP

GND

VOUT

VCC

ISET

ISENSE

PDRV

ENABLE

FFLAG

Now Available in Lead Free Packaging