TPS62200_13 Datasheet, PDF (1/24 Pages) Texas Instruments – HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER

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TPS62200, TPS62201
TPS62202, TPS62203, TPS62207
TPS62204, TPS62205, TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
HIGH-EFFICIENCY, SOT23
STEP-DOWN, DC-DC CONVERTER
FEATURES
• High Efficiency Synchronous Step-Down
Converter With up to 95% Efficiency
• 2.5-V to 6-V Input Voltage Range
• Adjustable Output Voltage Range From 0.7 V
to V_I
• Fixed Output Voltage Options Available
• Up to 300 mA Output Current
• 1-MHz Fixed Frequency PWM Operation
• Highest Efficiency Over Wide Load Current
Range Due to Power Save Mode
• 15-µA Typical Quiescent Current
• Soft Start
• 100% Duty Cycle Low-Dropout Operation
• Dynamic Output-Voltage Positioning
• Available in a 5-Pin SOT23 Package
APPLICATIONS
• PDAs and Pocket PC
• Cellular Phones, Smart Phones
• Low Power DSP Supply
• Digital Cameras
• Portable Media Players
• Portable Equipment
V_I
2.5 V − 6 V
C1
4.7 µF
TPS62202
L1
1 _VI
5 ^{10 µH}
SW
2
GND
3
EN
4
FB
V_O
1.8 V / 300 mA
C2
10 µF
Figure 1. Typical Application
(Fixed Output Voltage Version)
DESCRIPTION
The TPS6220x devices are a family of high-efficiency
synchronous step-down converters ideally suited for
portable systems powered by 1-cell Li-Ion or 3-cell
NiMH/NiCd batteries. The devices are also suitable
to operate from a standard 3.3-V or 5-V voltage rail.
With an output voltage range of 6 V down to 0.7 V
and up to 300 mA output current, the devices are
ideal to power low voltage DSPs and processors
used in PDAs, pocket PCs, and smart phones.
Under nominal load current, the devices operate with
a fixed switching frequency of typically 1 MHz. At
light load currents, the part enters the power save
mode operation; the switching frequency is reduced
and the quiescent current is typically only 15 µA;
therefore, it achieves the highest efficiency over the
entire load current range. The TPS6220x needs only
three small external components. Together with the
SOT23 package, a minimum system solution size is
achieved. An advanced fast response voltage mode
control scheme achieves superior line and load
regulation with small ceramic input and output
capacitors.
EFFICIENCY
vs
LOAD CURRENT
100
95 ^{VO = 1.8 V}
90 V_I = 2.7 V
85
80
V_I = 3.7 V
75
70
V_I = 5 V
65
60
55
50
45
40
0.010 0.100 1
10
100
I_L −Load Current − mA
1000
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2006, Texas Instruments Incorporated