TPS62220_07 Datasheet, PDF (1/24 Pages) Texas Instruments – 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23

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TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227
TPS62228, TPS62229
SLVS491D – SEPTEMBER 2003 – REVISED MARCH 2006
400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
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 400-mA Output Current
• 1.25-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 TSOT23 Package
APPLICATIONS
• PDAs and Pocket PC
• Cellular Phones, Smart Phones
• OMAP™ and Low Power DSP Supply
• Digital Cameras
• Portable Media Players
• Portable Equipment
• WLAN PC Cards
DESCRIPTION
The TPS6222x 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 400-mA output current, the devices are
ideal for powering the low voltage TMS320™ DSP
family and processors used in PDAs, pocket PCs,
and smart phones. Under nominal load current, the
devices operate with a fixed switching frequency of
typically 1.25 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, the device achieves
the highest efficiency over the entire load current
range. The TPS6222x needs only three small
external components. Together with the tiny TSOT23
package, a minimum system solution size can be
achieved. An advanced fast response voltage mode
control scheme achieves superior line and load
regulation with small ceramic input and output
capacitors.
V_I
2.5 V to 6 V
C3
4.7 mF
TPS62220
L1
1 _VI
4.7 mH
SW ⁵
2 _GND
3
EN
FB ⁴
R1
360 kW
R2
180 kW
C1
22 pF
V_O
1.5 V/400 mA
C4
10 mF
C2
100 pF
Typical Application (Adjustible Output Voltage Version)
100
95 ^VO ^{= 1.8 V,}
90
L = 4.7 mH,
C_O = 22 mF
85
80
V_I = 2.7 V
75
70
65
60
V_I = 3.7 V
55
50
45
40
0.01
V_I = 5 V
0.1 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.
OMAP, TMS320 are trademarks 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 © 2003–2006, Texas Instruments Incorporated