TPS64203DBVR ,Adjustable, up to 3A, 95% Efficient Step-Down Controller, 20uA, SOT-23ELECTRICAL CHARACTERISTICS V = 3.8 V, V = 3.3 V, EN = V , T = −40°C to 85°C (unless otherwise note ..
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TST1284ALF , 10/100 BASE-T MAGNETICS MODULES
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TST1284LF , 10/100 BASE-T MAGNETICS MODULES
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TPS64203DBVR-TPS64203DBVRG4-TPS64203DBVT
Adjustable, up to 3A, 95% Efficient Step-Down Controller, 20uA, SOT-23
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SLVS485 − AUGUST 2003
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FEATURES Step-Down Controller for Applications With
up to 95% Efficiency 1.8-V to 6.5-V Operating Input Voltage Range Adjustable Output Voltage Range From 1.2 V
to VI High Efficiency Over a Wide Load Current
Range 100% Maximum Duty Cycle for Lowest
Dropout Internal Softstart 20-µA Quiescent Current (Typical) Overcurrent Protected Available in a SOT23 Package
APPLICATIONS USB Powered Peripherals Organizers, PDAs, and Handheld PCs Low Power DSP Supply Digital Cameras Hard Disk Drives Portable Audio Players
DESCRIPTIONThe 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
TPS64200
Si5447DC
Rs = 33 mΩ
3.3 V / 2 A
10 µF
5 V
0.0001 0.001 0.01 0.1 1 10
TPS64200
EFFICIENCY
LOAD CURRENT
IO − Load Current − A
Efficiency − %
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