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Part: TPS6755P
Category:
Data Conversion
-> Multiplying Data Converters
Description: Adjustable Inverting DC/DC Converter
Company: Texas Instruments, Inc.
Datasheet: Download TPS6755P datasheet File size : 1862 kB
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Datasheet text preview:
TPS6755 ADJUSTABLE INVERTING DC/DC CONVERTER
SLVS155A NOVEMBER 1996 REVISED DECEMBER 1996
D D D D D D D D D D
1-W Output (VCC 4.5 V) 2.7-V to 9-V Input Operating Range 78% Typical Efficiency 160-kHz Fixed-Frequency Current-Mode PWM Controller EN Input Inhibits Operation and Reduces Supply Current to 1 µA Output Voltage Limited to VO 12 V VCC Soft Start 8-Pin SOIC and DIP Packages 40°C to 85°C Free-Air Temperature Range Pin-for-Pin Compatible with MAX755
D OR P PACKAGE (TOP VIEW)
EN REF SS COMP
1 2 3 4
8 7 6 5
VCC OUT GND FB
description
The TPS6755 is an adjustable inverting dc/dc converter capable of operating from inputs as low as 2.7 V. The only external components required are an inductor, an output filter capacitor, an input filter capacitor, a reference filter capacitor, two resistors, and a Schottky rectifier. An enable input is provided to shut down the inverter when an output voltage 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 device features a 160-kHz current-mode pulse-width-modulation (PWM) controller with a p-channel MOSFET power switch. The gate drive uses the converter output to reduce the die area needed to realize the 0.4- 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 TPS6755 is attractive for board-level dc/dc conversion in computer peripherals and in battery-powered equipment requiring high efficiency and low supply current. Available in an 8-pin DIP or an 8-pin SOIC package, the TPS6755 operates over a free-air temperature range of 40°C to 85°C.
VI 2.7 V to 9 V
+
47 µF 1 2
TPS6755 EN REF SS COMP VCC OUT GND FB 8 7 6 5 10 µH + 1 µF 1N5817 5V 100 µF
ENABLE +
10 µF
3 4
10.2 k 82 pF 42.2 k 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.
Copyright © 1996, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
TPS6755 ADJUSTABLE INVERTING DC/DC CONVERTER
SLVS155A NOVEMBER 1996 REVISED DECEMBER 1996
AVAILABLE OPTIONS PACKAGED DEVICES TA 40°C to 85°C SMALL OUTLINE (D) TPS6755ID PLASTIC DIP (P) TPS6755IP CHIP FORM FORM (Y) TPS6755Y
The D package is also available taped and reeled (TPS6755IDR).
functional block diagram
EN 1 EN FB 5 EN CurrentSense Amplifier x3 Drive Latch COMP GND 4 6 + _ Error Amplifier 2 Voltage Reference 1.2 M SS 3 x3 PWM Comparator R Q S 7 160-kHz Oscillator FB Power Switch PMOS OUT Driver Overcurrent Comparator 8
VCC
REF
SS Clamp
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TPS6755 ADJUSTABLE INVERTING DC/DC CONVERTER
SLVS155A NOVEMBER 1996 REVISED DECEMBER 1996
chip information
These chips, when properly assembled, display characteristics similar to the TPS6755. Thermal compression or ultrasonic bonding may be used on the doped aluminum bonding pads. The chips may be mounted with conductive epoxy or a gold-silicon preform.
BONDING PAD ASSIGNMENTS 1 8 8 8
(1) EN 2 REF (3) SS (4) 82 7 7 COMP (2) TPS6755Y
(8) (7) (6) (5)
VCC OUT GND FB
CHIP THICKNESS: 15 TYPICAL 6 BONDING PADS: 4 × 4 MINIMUM TJ max = 150°C 3 4 5 5 TOLERANCES ARE ± 10%. ALL DIMENSIONS ARE IN MILS.
75
Terminal Functions
TERMINAL NAME EN REF SS COMP FB GND OUT VCC NO. 1 2 3 4 5 6 7 8 DESCRIPTION Enable. EN > 2 V turns on the TPS6755. EN 0.4 V turns it off. 1.22-V reference voltage output. REF can source 125 µA for external loads. Soft start. A capacitor between SS and GND brings the output voltage up slowly. Compensation. A capacitor to ground stabilizes the feedback loop. Feedback. FB connects to the dc/dc converter output. Ground Power MOSFET drain connection Supply-voltage input
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
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