TPS60140_15 Datasheet, PDF (1/24 Pages) Texas Instruments – LOW POWER DC-DC CONVERTER REGULATED 5V,100-MA CHARGE PUMP VOLTAGE TRIPLER

TPS60140, TPS60141
LOW POWER DCĆDC CONVERTER
REGULATED 5 V, 100ĆmA CHARGE PUMP VOLTAGE TRIPLER
SLVS273− FEBRUARY 2000
features
D Regulated 5 V ± 4% Output Voltage With up
to 100 mA Output Current From a 1.8 V to
3.6 V Input Voltage Range
D 65-µA Quiescent Supply Current
D 0.05-µA Shutdown Current, Battery Is
Isolated From Load in Shutdown
D Integrated Low-Battery or Power-Good
Indicator
D Low Output Voltage Ripple Over Complete
Output Current Range
D Easy-To-Design With Low-EMI Power
Supply Since no Inductors Are Required
D Evaluation Module Available
(TPS60140EVM-144)
·
description
The TPS6014x step-up, regulated charge pumps
generate a 5-V ±4% output voltage from a 1.8 V
to 3.6 V input voltage range. The devices are
typically powered by two alkaline, NiCd, or NiMH
battery cells and provide an output current of
minimum 100 mA from a 2-V input. Only four
external capacitors are needed to build a
complete voltage tripler charge pump.
applications
D Replaces DC/DC Converters With Inductors
in Battery-Powered Applications:
− Two Battery Cells to 5 V Conversion
− Portable Instruments
− Miniature Equipment
− Backup-Battery Boost Converters
− Medical Instruments
− 5-V Smart Card Supply
− Organizers, PDAs
typical operating circuit
Input
1.8 V to 3.6 V
R1
TPS60140
IN
OUT
IN
FB
R2
Ci
4.7 µF
C1
2.2 µF
OFF/ON
LBI
LBO
C1+
C2+
C1−
C2−
ENABLE NC
PGND GND
Output
5 V, 100 mA
Co
10 µF
R3 _Low
Battery
Warning
C2
2.2 µF
The devices regulate the output by using the
pulse-skip topology. The controller is optimized for
lowest output voltage ripple over the complete output current range. The output peak current and therefore the
output voltage ripple are drastically reduced compared to a conventional pulse-skip topology by regulating the
charge pump output resistance. At light loads the maximum output resistance is limited to assure a low
quiescent current.
The TPS60140 includes a low-battery comparator that issues a warning if the battery voltage drops below a
user-adjustable threshold voltage. The TPS60141 features a power-good output that goes active when the
output voltage reaches 90% of its nominal value.
The logic shutdown function disables the converter, reduces the supply current to a maximum of 1 µA and
disconnects the output from the input. Special current-control circuitry prevents excessive current from being
drawn from the battery during start-up. This dc-dc converter requires no inductors, therefore, EMI is of little
concern. It is available in the small, thermally enhanced 20-pin TSSOP package (PWP).
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.
PowerPAD is a trademark of 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.
Copyright  2000, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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