LT1764_1 Datasheet, PDF (1/20 Pages) Linear Technology – 3A, Fast Transient Response, Low Noise,LDO Regulators

FEATURES
■ _{Optimized for Fast Transient Response}
■ _{Output Current: 3A}
■ _{Dropout Voltage: 340mV at 3A}
■ _{Low Noise: 40µVRMS (10Hz to 100kHz)}
■ _{1mA Quiescent Current}
■ _{Wide Input Voltage Range: 2.7V to 20V}
■ _{No Protection Diodes Needed}
■ _{Controlled Quiescent Current in Dropout}
■ _{Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V}
■ _{Adjustable Output from 1.21V to 20V}
■ _{< 1µA Quiescent Current in Shutdown}
■ _{Stable with 10µF Output Capacitor}
■ _{Reverse Battery Protection}
■ _{No Reverse Current}
■ _{Thermal Limiting}
■ _{Available in 5-Lead TO-220, DD and 16-Lead}
TSSOP Packages
U
APPLICATIO S
■ _{3.3V to 2.5V Logic Power Supply}
■ _{Post Regulator for Switching Supplies}
TYPICAL APPLICATIO
3.3V_IN to 2.5V_OUT Regulator
V_IN > 3V
+
10µF
IN
OUT
LT1764-2.5
SHDN SENSE
GND
2.5V
+
3A
10µF
1764 TA01
LT1764 Series
3A, Fast Transient
Response, Low Noise,
LDO Regulators
DESCRIPTIO
The LT^®1764 is a low dropout regulator optimized for fast
transient response. The device is capable of supplying 3A
of output current with a dropout voltage of 340mV. Oper-
ating quiescent current is 1mA, dropping to < 1µA in
shutdown. Quiescent current is well controlled; it does not
rise in dropout as it does with many other regulators. In
addition to fast transient response, the LT1764 has very
low output voltage noise which makes the device ideal for
sensitive RF supply applications.
Output voltage range is from 1.21V to 20V. The LT1764
regulators are stable with output capacitors as low as 10µF.
Internal protection circuitry includes reverse battery pro-
tection, current limiting, thermal limiting and reverse cur-
rent protection. The device is available in fixed output
voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable
device with a 1.21V reference voltage. The LT1764 regu-
lators are available in 5-lead TO-220, DD and Exposed Pad
16-lead TSSOP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6144250, 6118263.
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1764 TA02
1764fb
1