TPS62220 Datasheet, PDF (1/20 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
TPS62228, TPS62229
SLVS491C – SEPTEMBER 2003 – REVISED SEPTEMBER 2004
400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
FEATURES
• High-Efficiency Synchronous Step-Down Con-
verter With up to 95% Efficiency
• 2.5-V to 6.0-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 6.0 V down to 0.7 V
and up to 400-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 1.25 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 µF
TPS62220
L1
1 _VI
4.7 µH
SW ⁵
2 _GND
3
EN
FB ⁴
R1
360 kΩ
R2
180 kΩ
C1
22 pF
V_O
1.5 V/400 mA
C4
10 µF
C2
100 pF
Typical Application (Adjustable Output Voltage Version)
100
95 ^VO ^{= 1.8 V,}
90
L = 4.7 µH,
C_O = 22 µF
85
80 VI = 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 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