SP6122_04 Datasheet, PDF (1/19 Pages) Sipex Corporation – Low Voltage, Micro 8, PFET, Buck Controller Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters

®
SP6122
Low Voltage, Micro 8, PFET, Buck Controller
Ideal for 1A to 5A, Small Footprint, DC-DC Power Converters
■ 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
VCC 1
FFLAG 2
VOUT 3
SP6122
8 Pin MSOP
8 PDRV
7 GND
6 ISET
■ Internal Soft Start Circuit
■ Accurate 1.5% Reference
ENABLE 4
5 ISENSE
■ Programmable Output Voltage or Fixed 1.5V Output
■ Loss-less Adjustable Current Limit with High side ^{Now Available in Lead Free Packaging}
R_DS(ON) Sensing
■ 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
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.
TYPICAL APPLICATION CIRCUIT
R1
V_IN ^{3.0V to 7.0V}
C1
4.7µF
FFLAG
ENABLE
5Ω
C2
100µF
V_CC
FFLAG
V_OUT
PDRV
®
GND
SP6122 _ISET
ENABLE
I_SENSE
R_SET
1k
STPS2L25U
Q1
PDS6375
L1
2.2µH
DFLY
1A to 5A
V_OUT
C_OUT
470µF
Date: 10/02/04
SP6122 Low Voltage, Micro 8, PFET, Buck Controller
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© Copyright 2004 Sipex Corporation