TPS61020 Datasheet, PDF (1/22 Pages) Texas Instruments – 96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 1.5-A SWITCH

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(3,25 mm x 3,25 mm)
TPS61020, TPS61024
TPS61025, TPS61027
SLVS451A – SEPTEMBER 2003 – REVISED APRIL 2004
96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 1.5-A SWITCH
FEATURES
• 96% Efficient Synchronous Boost Converter
– 200-mA Output Current From 0.9-V Input
– 500-mA Output Current From 1.8-V Input
• Output Voltage Remains Regulated When In-
put Voltage Exceeds Nominal Output Voltage
• Device Quiescent Current: 25-µA (Typ)
• Input Voltage Range: 0.9-V to 6.5-V
• Fixed and Adjustable Output Voltage Options
Up to 5.5-V
• Power Save Mode for Improved Efficiency at
Low Output Power
• Low Battery Comparator
• Low EMI-Converter (Integrated Antiringing
Switch)
• Load Disconnect During Shutdown
• Over-Temperature Protection
• Small 3 mm x 3 mm QFN-10 Package
APPLICATIONS
• All One-Cell, Two-Cell and Three-Cell Alkaline,
NiCd or NiMH or Single-Cell Li Battery
Powered Products
• Portable Audio Players
• PDAs
• Cellular Phones
• Personal Medical Products
• Camera White LED Flash Light
DESCRIPTION
The TPS6102x devices provide a power supply
solution for products powered by either a one-cell,
two-cell, or three-cell alkaline, NiCd or NiMH, or
one-cell Li-Ion or Li-polymer battery. Output currents
can go as high as 200 mA while using a single-cell
alkaline, and discharge it down to 0.9 V. It can also
be used for generating 5 V at 500 mA from a 3.3-V
rail or a Li-Ion battery. The boost converter is based
on a fixed frequency, pulse-width-modulation (PWM)
controller using a synchronous rectifier to obtain
maximum efficiency. At low load currents the con-
verter enters the Power Save mode to maintain a
high efficiency over a wide load current range. The
Power Save mode can be disabled, forcing the
converter to operate at a fixed switching frequency.
The maximum peak current in the boost switch is
limited to a value of 1500 mA.
The TPS6102x devices keep the output voltage
regulated even when the input voltage exceeds the
nominal output voltage. The output voltage can be
programmed by an external resistor divider, or is
fixed internally on the chip. The converter can be
disabled to minimize battery drain. During shutdown,
the load is completely disconnected from the battery.
A low-EMI mode is implemented to reduce ringing
and, in effect, lower radiated electromagnetic energy
when the converter enters the discontinuous conduc-
tion mode. The device is packaged in a 10-pin QFN
PowerPAD™package measuring 3 mm x 3 mm
(DRC).
0.9-V To
C1
6.5-V Input 10 µF
L1
6.8 µH
R1
R2
SW
VBAT
EN
LBI
VOUT
FB
PS
LBO
GND
PGND
TPS61020
C2
C3
R3 2.2 µF 47 µF
R4
R5
V_O
3.3 V Up To
200 mA
Low Battery
Output
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2004, Texas Instruments Incorporated