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TPS64200 Datasheet

  • TPS64200

  • SOT23 STEP DOWN CONTROLLER

  • 278.05KB

  • 24頁(yè)

  • TI

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TPS64200, TPS64201
TPS64202, TPS64203
SLVS485 鈭?AUGUST 2003
SOT23 STEP DOWN CONTROLLER
FEATURES
D
Step-Down Controller for Applications With
up to 95% Efficiency
D
1.8-V to 6.5-V Operating Input Voltage Range
D
Adjustable Output Voltage Range From 1.2 V
D
to V
I
High Efficiency Over a Wide Load Current
Range
Dropout
D
D
D
D
Low Power DSP Supply
Digital Cameras
Hard Disk Drives
Portable Audio Players
DESCRIPTION
The TPS6420x are nonsynchronous step-down
controllers that are ideally suited for systems powered
from a 5-V or 3.3-V bus or for applications powered from
a 1-cell Li-Ion battery or from a 2- to 4-cell NiCd, NiMH, or
alkaline battery. These step-down controllers drive an
external P-channel MOSFET allowing design flexibility. To
achieve highest efficiency over a wide load current range,
this controller uses a minimum on time, minimum off time
control scheme and consumes only 20-碌A(chǔ) quiescent
current. The minimum on time of typically 600 ns
(TPS64203) allows the use of small inductors and
capacitors. When disabled, the current consumption is
reduced to less than 1
碌A(chǔ).
The TPS6420x is available in
the 6-pin SOT23 (DBV) package and operates over a free
air temperature range of 鈭?0擄C to 85擄C.
D
100% Maximum Duty Cycle for Lowest
D
D
D
D
Internal Softstart
20-碌A(chǔ) Quiescent Current (Typical)
Overcurrent Protected
Available in a SOT23 Package
APPLICATIONS
D
USB Powered Peripherals
D
Organizers, PDAs, and Handheld PCs
TYPICAL APPLICATION CIRCUIT
TPS64200
5V
10
碌F
TPS64200
1
2
3
EN
GND
SW
VIN
6
5
4
R1
620 k鈩?/div>
47
碌F
PosCap
6TPA47M
Si5447DC
10
碌H
3.3 V / 2 A
Rs = 33 m鈩?/div>
100
90
80
70
Efficiency 鈭?%
60
50
40
30
20
10
EFFICIENCY
vs
LOAD CURRENT
VI = 4.2 V
FB ISENSE
ZHCS2000
R2
360 k鈩?/div>
TA = 25擄C,
VO = 3.3 V
0.001
0.01
0.1
IO 鈭?Load Current 鈭?A
1
10
0
0.0001
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 Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright
錚?/div>
2003, Texas Instruments Incorporated

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