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LT1528CQ Datasheet

  • LT1528CQ

  • 3A Low Dropout Regulator for Microprocessor Applications

  • 12頁(yè)

  • LINER

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LT1528
3A Low Dropout Regulator
for Microprocessor Applications
FEATURES
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DESCRIPTION
The LT
廬
1528 is a 3A low dropout regulator optimized to
handle the large load current transients associated with
the current generation of microprocessors. This device
has the fastest transient response of currently available
PNP regulators and is very tolerant of variations in capaci-
tor ESR. Dropout voltage is 75mV at 10mA, rising to
300mV at 1A and 600mV at 3A. The device has a quiescent
current of 400碌A(chǔ). Quiescent current is well controlled; it
does not increase significantly as the device enters drop-
out. The regulator can operate with output capacitors as
small as 3.3碌F, although larger capacitors will be needed
to achieve the performance required in most microproces-
sor applications. The LT1528 is available with a fixed
output voltage of 3.3V. An external Sense pin allows
adjustment to output voltages greater than 3.3V, using a
simple resistive divider. This allows the device to be
adjusted over a wide range of output voltages, including
the 3.3V to 4.2V range required by a variety of processors
from Intel, IBM, AMD, and Cyrix.
The LT1528 has both reverse input and reverse output
protection and includes a shutdown feature. Quiescent
current drops to 125碌A(chǔ) in shutdown. The LT1528 is
available in 5-lead TO-220 and 5-lead DD packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Dropout Voltage: 0.6V at I
OUT
= 3A
Fast Transient Response
Output Current: 3A
Quiescent Current: 400碌A(chǔ)
No Protection Diodes Needed
Fixed Output Voltage: 3.3V
Controlled Quiescent Current in Dropout
Shutdown I
Q
= 125碌A(chǔ)
Stable with 3.3碌F Output Capacitor
Reverse Battery Protection
No Reverse Output Current
Thermal Limiting
APPLICATIONS
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Microprocessor Applications
Post Regulator for Switching Supplies
5V to 3.3V Logic Regulator
TYPICAL APPLICATION
Microprocessor Supply with Shutdown
0.6
5
IN
LT1528
4
SHDN
GND
3
330鈩?/div>
SENSE
2
J1
J2
J3
OUT
1
15鈩?/div>
68鈩?/div>
V
OUT
+
V
IN
=5V
DROPOUT VOLTAGE (V)
4
脳
47碌F*
SOLID TANTALUM
0.5
0.4
0.3
0.2
0.1
0
V
SHDN
(PIN 4)
<0.25
>2.80
NC
OUTPUT
OFF
ON
ON
SHORTING
J1
J2
J3
V
OUT
3.30
3.45
4.00
*CHOOSE CAPACITORS
TO MEET PROCESSOR
REQUIREMENTS
LT1528 鈥?TA01
0
U
U
U
Dropout Voltage
0.5
2.5
1.0
1.5
2.0
OUTPUT CURRENT (mA)
3.0
LT1528 鈥?TA02
1

LT1528CQ 產(chǎn)品屬性

  • LT1528

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 線(xiàn)性

  • -

  • 正，固定式和可調(diào)式

  • 3.3V，3.3 V ~ 14.15 V

  • 3.9 V ~ 15 V

  • 0.57V @ 3A

  • 1

  • 3A

  • 0°C ~ 125°C

  • 表面貼裝

  • TO-263-6，D²Pak（5 引線(xiàn)+接片），TO-263BA

  • D2PAK-5

  • 管件

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