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SP6121CN/TR

Description
Switching converters, voltage regulators and controllers low voltage, 8 pin synchronous, cntrllr
Categorysemiconductor    Power management   
File Size379KB,16 Pages
ManufacturerExar [Exar Corporation]
Environmental Compliance
Download Datasheet Parametric Compare View All

SP6121CN/TR Overview

Switching converters, voltage regulators and controllers low voltage, 8 pin synchronous, cntrllr

SP6121CN/TR Parametric

Parameter NameAttribute value
MakerExar [Exar Corporation]
Product CategorySwitching Converters, Regulators and Controllers
RoHSyes
EncapsulationReel
®
SP6121
Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
Low Voltage, Synchronous Step Down PWM Controller
FEATURES
VCC 1
8 PDRV
Optimized for Single Input Voltage - 3V to 5.5V
SP6121
GND 2
High Efficiency: Greater than 95% possible
7 NDRV
8 Pin nSOIC
Accurate, 500kHz Fixed Frequency Operation
VFB 3
6 ISET
Fast Transient Response
5 ISENSE
COMP 4
500µA, I
Q
(25µA in Shutdown)
Internal, 0.4 V/ms, Soft Start Circuit
Now Available in Lead Free Packaging
Precision 1% Reference
Resistor Programmable Output Voltage
APPLICATIONS
Lossless Adjustable Current Limit with
Supply Bias for
High Side R
DS(ON)
Sensing
- DSP
0% to 100% Duty Cycle Range
- Microprocessor Core
High Side PMOS Switch Negates Need for
- I/O & Logic
External Charge Pump
Video Cards
Output Over Voltage Protection
Board Level Supply in
Hiccup Mode Current Limit Protection
Distributed Power Systems
DESCRIPTION
The SP6121 is a fixed frequency, voltage mode, synchronous PWM controller designed to work
from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high efficiency
power conversion. The operating frequency is internally set at 500kHz, permitting the use of
small, surface mount inductors and capacitors. Requiring only few external components, the
SP6121 packaged in an 8-pin SOIC, is especially suited for low voltage applications where cost,
small size and high efficiency are critical. With its low voltage capability and inherent 100% duty
cycle operation, the SP6121 allows low dropout operation in the event of a low input supply
voltage condition.
TYPICAL APPLICATION CIRCUIT
RV
CC
5
®
RSET
2.3k
Q1
1.8µH
L1
Q2
DS
C
IN
47µF
Ceramic 6.3V
3.3V
V
IN
CB
3.3µF
V
CC
GND
V
FB
COMP
RZ
10k
CZ
3.7nF
PDRV
SP6121
U1
NDRV
I
SET
I
SENSE
1.9V 8A
V
OUT
C
OUT
470µF x 2
R1
5.2k
R2
10k
CP
50pF
Q1 = FAIRCHILD FDS6375
Q2 = FAIRCHILD FDS6690A
DS = STMICROELECTRONICS STPS2L25BU
Date: 11/29/04
L1 = PANASONIC ETQ-P6F1R6SFA
C
OUT
= SANYO 4TPB470M
© Copyright 2004 Sipex Corporation
SP6121 Low Voltage, Synchronous Step Down PWM Controller
1

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SP6121CN/TR
Description Switching converters, voltage regulators and controllers low voltage, 8 pin synchronous, cntrllr
Maker Exar [Exar Corporation]
Product Category Switching Converters, Regulators and Controllers
RoHS yes
Encapsulation Reel
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