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TPS62222 Datasheet

  • TPS62222

  • 采用小型 SOT-23 封装静态电流为 15uA 的 1.8V 400mA 输出 95% ...

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  • 22页

  • TI

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TPS62220, TPS62221, TPS62222
TPS62223, TPS62224
TPS62228, TPS62229
SLVS491C 鈥?SEPTEMBER 2003 鈥?REVISED SEPTEMBER 2004
400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
FEATURES
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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-碌A Typical Quiescent Current
Soft Start
100% Duty Cycle Low-Dropout Operation
Dynamic Output-Voltage Positioning
Available in TSOT23 Package
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 碌A; 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.
APPLICATIONS
PDAs and Pocket PC
Cellular Phones, Smart Phones
OMAP鈩?and Low Power DSP Supply
Digital Cameras
Portable Media Players
Portable Equipment
WLAN PC Cards
100
95
TPS62220
V
I
2.5 V to 6 V
C3
4.7
碌F
1
2
3
V
I
GND
EN
FB
4
R2
180 k鈩?/div>
C2
100 pF
SW
5
L1
4.7
碌H
R1
360 k鈩?/div>
C1
22 pF
C4
10
碌F
Efficency 鈭?%
V
O
1.5 V/400 mA
90
85
80
V
I
= 2.7 V
75
70
65
60
55
50
45
40
0.01
V
O
= 1.8 V,
L = 4.7
碌H,
C
O
= 22
碌F
V
I
= 3.7 V
V
I
= 5 V
Typical Application (Adjustable Output Voltage Version)
0.1
1
10
100
I
L
鈭?Load Current 鈭?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 漏 2003鈥?004, Texas Instruments Incorporated

TPS62222 PDF文件相关型号

TPS62223,TPS62224,TPS62228

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