TPS64200_15 Datasheet, PDF (1/29 Pages) Texas Instruments – SOT23 STEP-COWN CONTROLLER

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SOT23 STEPĆDOWN CONTROLLER
TPS64200, TPS64201
TPS64202, TPS64203
SLVS485 − AUGUST 2003
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
to V_I
D High Efficiency Over a Wide Load Current
Range
D 100% Maximum Duty Cycle for Lowest
Dropout
D Internal Softstart
D 20-µA Quiescent Current (Typical)
D Overcurrent Protected
D Available in a SOT23 Package
APPLICATIONS
D USB Powered Peripherals
D Organizers, PDAs, and Handheld PCs
D Low Power DSP Supply
D Digital Cameras
D Hard Disk Drives
D 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-µA 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 µA. The TPS6420x is available in
the 6-pin SOT23 (DBV) package and operates over a free
air temperature range of −40°C to 85°C.
TYPICAL APPLICATION CIRCUIT
5V
10 µF
TPS64200
1 _EN
SW ⁶
2 GND VIN 5
3 ^{FB ISENSE} 4
ZHCS2000
Rs = 33 mΩ
Si5447DC
10 µH
R1
620 kΩ
R2
360 kΩ
3.3 V / 2 A
47 µF
PosCap
6TPA47M
TPS64200
EFFICIENCY
vs
100
LOAD CURRENT
90
80
VI = 4.2 V
70
60
50
40
30
20
TA = 25°C,
10 _{VO = 3.3 V}
0
0.0001 0.001 0.01 0.1
1
10
IO − Load Current − A
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  2003, Texas Instruments Incorporated