st763a STMicroelectronics, st763a Datasheet

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st763a

Manufacturer Part Number
st763a
Description
3.3v Step Down Current Mode Pwm Dc-dc Converters
Manufacturer
STMicroelectronics
Datasheet
DESCRIPTION
The ST763A is a step-down switching regulator . It
operates from 3.3V to 11V giving a fixed 3.3V
output voltage, delivering up to 500mA. The
mainly features are typical efficiency of 90%,
quiescent current of 0.6mA, and only 0.2 A in
shut-down.
The PWM current mode control provides precise
output regulation
response. Output voltage accuracy is guaranteed
to be
variations. A minimum number of external
SCHEMATIC DIAGRAM
November 2000
OUTPUT VOLTAGE 3.3V
SUPPLY VOLTAGE RANGE FROM 3.3V TO
11V
TYPICAL OPERATION FREQUENCY:
200KHz
VERY LOW QUIESCENT CURRENT: 0.6mA
ON MODE 0.2 A OFF MODE
SWITCH ON/OFF CONTROL
TYPICAL EFFICENCY: 90%
OPERATING TEMPERATURE RANGE:
-40°C TO 85° C
AVAILABLE IN SO-8 AND DIP-8 PACKAGES
GUARANTEED OUTPUT CURRENT: 500mA
5% over line, load and temperature
and
CURRENT MODE PWM DC-DC CONVERTERS
very
good
transient
components is used and the fixed frequency
switching allows easy filtering of output ripple and
noise.
Other features of this ddevice are cycle-by-clicle
current limiting, overcurrent limiting, under voltage
lockout and programmable soft-start protection.
A 22 H inductor works in most applications, so no
sophisticated design is necessary.
Typical application are in 5V to 3.3V converters,
cellular phones, portable instruments, hand-held
computers, and peripherals.
Package available are SO-8 and DIP-8.
DIP-8
3.3V STEP DOWN
ST763A
SERIES
SO-8
1/10

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st763a Summary of contents

Page 1

... TYPICAL EFFICENCY: 90% OPERATING TEMPERATURE RANGE: -40°C TO 85° C AVAILABLE IN SO-8 AND DIP-8 PACKAGES DESCRIPTION The ST763A is a step-down switching regulator . It operates from 3.3V to 11V giving a fixed 3.3V output voltage, delivering up to 500mA. The mainly features are typical efficiency of 90%, quiescent current of 0.6mA, and only 0 shut-down ...

Page 2

... ST763A SERIES ABSOLUTE MAXIMUM RATINGS Symbol V DC Input Voltage CC V Switch Pin Voltage LX V Shutdown Voltage (SHDN) SHDN V ,V Soft Start (SS) and Compensation Capacitor (CC) Pins Voltage Switching Peak Current LX I Reference Current REF Continuous Power Dissipation TOT T Storage Temperature Range ...

Page 3

... Output Voltage Sense Input: provides regulation of feedback sensing. Connect to 3.3V output. Ground Switch Output. Drain of internal P-Channel Power MOSFET Supply Voltage Input. Bypass to GND with 1 F ceramic capacitance and large value electrolytic capacitor in parallel. The 1 F capacitor must be as close as possible to the GND and V pins CC ST763A SERIES 3/10 ...

Page 4

... ST763A SERIES ELECTRICAL CHARACTERISTICS (V Symbol Parameter V Input Voltage CC V Output Voltage O V Line Regulation O V Load Regulatio O Power Efficency I Supply Current SUPPLY V SHDN Input High Threshold IH V SHDN Input Low Threshold IL I Shutdown Input Leakage SHDN Current V Under Voltage Lockout LOCK ...

Page 5

... TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified T Figure 1 : Output Voltage vs Temperature Figure 2 : Output Voltage vs Input Voltage Figure 3 : Reference Voltage vs Temperature ST763A SERIES = 25°C j Figure 4 : Efficency vs Temperature Figure 5 : Efficency vs Output Current Figure Leakage Current vs Temperature 5/10 ...

Page 6

... ST763A SERIES Figure Resistance vs Temperature Figure 8 : Shutdown Input Threshold vs Temperature Figure 9 : Shutdown Input Leakage Current vs Temperature 6/10 Figure 10 : Oscillator Frequency vs Temperature Figure 11 : Oscillator Frequency vs Input Voltage Figure 12 : Switching Waveforms, Continuous Conduction V =6V, I =250mA I O ...

Page 7

... Figure 13 : Switching Waveforms, Discontinuous Conduction V =6V, I =75mA I O Figure 14 : Line Transient i =350mA O ST763A SERIES Figure 15 : Load Transient V =5V 500mA I O 7/10 ...

Page 8

... ST763A SERIES Plastic DIP-8 MECHANICAL DATA DIM. MIN 0.7 B 1. 0.44 8/10 mm TYP. MAX. MIN. 3.3 0.028 1.65 0.055 1.04 0.036 0.5 0.5 0.015 9.8 8.8 2.54 7.62 7.62 7.1 4.8 3.3 1.6 0.017 inch TYP. MAX. 0.130 0.065 0.041 0.020 0.020 0.386 0.346 0.100 0.300 0.300 0.280 0.189 0.130 0.063 ...

Page 9

... TYP 0 0.65 b 0.35 b1 0. 4.8 E 5.8 e 1.27 e3 3.81 F 3 inch MAX. MIN. TYP. 1.75 0.25 0.003 1.65 0.85 0.025 0.48 0.013 0.25 0.007 0.5 0.010 45 (typ.) 5.0 0.188 6.2 0.228 0.050 0.150 4.0 0.14 1.27 0.015 0.6 8 (max.) ST763A SERIES MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019 0.196 0.244 0.157 0.050 0.023 0016023 9/10 ...

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... ST763A SERIES Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...

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