Document
TPS62220, TPS62221, TPS62222 TPS62223, TPS62224, TPS62225 TPS62227, TPS62228, TPS62229
www.ti.com....................................................................................................................................... SLVS491E – SEPTEMBER 2003 – REVISED FEBRUARY 2009
400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
FEATURES
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•2 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 VI • 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.
VI 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
VO 1.5 V/400 mA C4
10 mF
C2 100 pF
Typical Application (Adjustible Output Voltage Version)
Efficency − %
100
95 VO = 1.8 V,
90
L = 4.7 mH, CO = 22 mF
85
80 VI = 2.7 V 75
70
65
60 VI = 3.7 V 55
50
45 40
0.01
VI = 5 V
0.1 1
10 100
IL − Load Current − mA
1000
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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.
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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 © 2003–2009, Texas Instruments Incorporated
TPS62220, TPS62221, TPS62222 TPS62223, TPS62224, TPS62225 TPS62227, TPS62228, TPS62229
SLVS491E – SEPTEMBER 2003 – REVISED FEBRUARY 2009....................................................................................................................................... www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION (1)
TA -40 °C to 85 °C
OUTPUT VOLTAGE Adjustable 1.2 V 1.5 V 1.6 V 1.7 V 1.8 V 1.875 V 2.2 V 2.3 V
THIN-SOT23 PACKAGE TPS62220DDC TPS62227DDC TPS62221DDC TPS62224DDC TPS62229DDC TPS62222DDC TPS62228DDC TPS62225DDC TPS62223DDC
SYMBOL ALN BRZ ALO ALQ EJ APP EH NXY ALX
(1) The DDC package is available in tape and reel. Add R suffix (TPS62220DDCR) to order quantities of 3000 parts. Add T suffix (TPS62220DDCT) to order quantities of 250 parts.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature (unless otherwise noted) (1)
VI Supply voltage on pin (2) Voltages on pins SW, EN, FB (2)
PD Continuous power dissipation TJ Operating junction temperature range Tstg Storage temperature
Lead temperature (soldering, 10 sec)
TPS6222x -0.3 to 7.0 -0.3 to VI +0.3 See Dissipation Rating Table -40 to 150 -65 to 150
260
UNIT V V
°C °C °C
(1) Stresses beyond those listed under "absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network.