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AAT2603INJ-2-T1 Datasheet

  • AAT2603INJ-2-T1

  • Total Power Solution for Portable Applications

  • 26頁

  • ANALOGICTECH

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PRODUCT DATASHEET
AAT2603
Total Power Solution for Portable Applications
General Description
The AAT2603 is a highly integrated power management
solution for handheld mobile systems. It provides six
regulated voltages from a single-cell Lithium-ion/poly-
mer battery or a 5V supply.
The six outputs are produced by six regulators; two
switching step-down regulators and four low-dropout
(LDO) regulators. Each voltage regulator has its own
independent enable pin.
The high efficiency step-down regulators are fully inte-
grated and switch at a high 1.5 MHz fixed frequency.
They automatically transition to variable frequency
operation at light loads for improved efficiency. DC-DC1
(Buck1) is designed for high output current and low
dropout voltage (200mV at 1.2A). DC-DC2 (Buck2) is a
600mA regulator with a two step dynamic output voltage
capability. One option allows the output voltage of
DC-DC2 (Buck2) to be set to either 1.0V or 1.3V with the
SELB2 logic pin.
LDO regulators LDO1 and LDO2 can supply up to 400mA
of load current with output voltages adjustable down to
1.5V. LDO regulators LDO3 and LDO4 can supply up to
200mA of current and provide good noise and power sup-
ply rejection. LDO3 and LDO4 have output voltages exter-
nally adjustable down to 1.2V.
The AAT2603 is available in a Pb-free thermally enhanced
28-pin TQFN44 package and is rated for operation over
the -40擄C to +85擄C temperature range.
Features
鈥?V
IN
Range: 2.7V to 5.5V
鈥?Two Step-Down Regulators
鈻?/div>
DC-DC1(Buck1): 1.2A, Low Dropout Voltage
鈥?Externally Adjustable: V
FBB1
= 0.6V
鈻?/div>
V
OUT
Range: 0.6V to V
INB1
鈥?Fixed: V
OUT
= 3.3V
鈻?/div>
Factory Programmable to any Two Voltage
Levels from 0.6V to 4.0V
鈥?DC-DC2(Buck2): 0.6A, Low Dropout Voltage
鈥?Externally Adjustable: V
FBB2
= 0.6V
鈻?/div>
V
OUT
Range: 0.6V to V
INB2
鈥?Fixed: V
OUT
= 1.0V[SELB2=鈥?鈥橾/1.3V[SELB2=鈥?鈥橾
鈻?/div>
Factory Programmable to any Two Voltage
Levels from 0.6V to 4.0V
鈻?/div>
Fixed 1.5MHz Switching Frequency
鈻?/div>
Internally Compensated Current Mode Control
鈻?/div>
High Efficiency over the Entire Load Range
鈻?/div>
Four LDO Regulators
鈥?LDO1: 400mA LDO
鈥?LDO2: 400mA LDO
鈥?LDO3: 200mA, Low Noise LDO
鈥?LDO4: 200mA, Low Noise LDO
鈥?Fast Turn-On and Turn-Off time
鈥?Short Circuit and Over-Current Protection
鈥?Over-Temperature Protection
鈥?Temperature Range: -40擄C to +85擄C
鈥?TQFN44-28 Package
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Handheld GPS
Handheld Instruments
PDAs and Handheld Computers
Portable Media Players
Smart Phones
2603.2008.06.1.0
www.analogictech.com
1

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