SLVS141A Datasheet, PDF (1/18 Pages) Texas Instruments – FIXED NEGATIVE 5-V 200-mA INVERTING DC/DC CONVERTER

TPS6735
FIXED NEGATIVE 5ĆV 200ĆmA INVERTING DC/DC CONVERTER
D Negative 5-V 200-mA Output (V_CC ≥ 4.5 V)
D 4-V to 6.2-V Input Operating Range
D 78% Typical Efficiency
D 160-kHz Fixed-Frequency Current-Mode
PWM Controller
D EN Input Inhibits Operation and Reduces
Supply Current to 1 µA
D Soft Start
D 8-Pin SOIC and DIP Packages
D −40°C to 85°C Free-Air Temperature Range
D Pin-for-Pin Compatible with MAX735
SLVS141A − JULY 1996 − REVISED JANUARY 1997
D OR P PACKAGE
(TOP VIEW)
EN 1
REF 2
SS 3
COMP 4
8 V_CC
7 OUT
6 GND
5 FB
description
The TPS6735 is a fixed negative 5-V output inverting dc/dc converter capable of delivering 200 mA from inputs
as low as 4.5 V. The only external components required are an inductor, an output filter capacitor, an input filter
capacitor, a reference filter capacitor, and a Schottky rectifier. An enable input is provided to shut down the
inverter when a −5-V output is not needed. The typical supply current is 1.9 mA at no-load and is further reduced
to 1-µA when the enable input is low.
The TPS6735 is a 160-kHz current-mode pulse-width-modulation (PWM) controller with a p-channel MOSFET
power switch. The gate drive uses the −5-V output to reduce the die area needed to realize the 0.4-Ω MOSFET.
Soft start is accomplished with the addition of one small capacitor at SS. A 1.22-V reference is available for
external loads up to 125 µA.
The TPS6735 is attractive for board-level dc/dc conversion in computer peripherals and in battery-powered
equipment requiring high efficiency and low supply current.
The TPS6735 is available in 8-pin DIP and SOIC packages and operates over a free-air temperature range of
−40°C to 85°C.
VI
4 V to 6.2 V
+
47 µF
TPS6735
ENABLE
+
10 µF
82 pF†
1
EN
2
REF
3
SS
4
COMP
8
VCC
7
OUT
6
GND
5
FB
1 µF ^1N5817
10 µH
−5V
100 µF
+
† _{Not required for loads of 100 mA or less}
Figure 1. Typical Circuit
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  1997, Texas Instruments Incorporated
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