LT1764A Series
3A, Fast Transient
Response, Low Noise,
LDO Regulators
FEATURES
DESCRIPTIO
Optimized for Fast Transient Response
The LT 1764A is a low dropout regulator optimized for
Output Current: 3A
fast transient response. The device is capable of supplying
Dropout Voltage: 340mV at 3A
3A of output current with a dropout voltage of 340mV.
Low Noise: 40V (10Hz to 100kHz)
RMS Operating quiescent current is 1mA, dropping to < 1A in
1mA Quiescent Current
shutdown. Quiescent current is well controlled; it does not
Wide Input Voltage Range: 2.7V to 20V
rise in dropout as it does with many other regulators. In
No Protection Diodes Needed
addition to fast transient response, the LT1764A has very
Controlled Quiescent Current in Dropout
low output voltage noise which makes the device ideal for
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
sensitive RF supply applications.
Adjustable Output from 1.21V to 20V
Output voltage range is from 1.21V to 20V. The LT1764A
<1A Quiescent Current in Shutdown
regulators are stable with output capacitors as low as 10F.
Stable with 10F Output Capacitor*
Internal protection circuitry includes reverse battery pro-
Stable with Ceramic Capacitors*
tection, current limiting, thermal limiting and reverse cur-
Reverse Battery Protection
rent protection. The device is available in fixed output
No Reverse Current
voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable
Thermal Limiting
device with a 1.21V reference voltage. The LT1764A regu-
lators are available in 5-lead TO-220 and DD packages, and
U
16-lead FE packages.
APPLICATIO S
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
3.3V to 2.5V Logic Power Supply All other trademarks are the property of their respective owners.
Post Regulator for Switching Supplies *See Applications Information Section.
TYPICAL APPLICATIO
Dropout Voltage
400
350
3.3V to 2.5V Regulator
IN OUT
300
2.5V
250
IN OUT
3A
+ +
V > 3V 10F* 10F*
IN
200
LT1764A-2.5
150
SHDN SENSE
*TANTALUM,
100
GND CERAMIC OR
ALUMINUM ELECTROLYTIC
50
1764 TA01
0
0 0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1764 TA02
1764afb
1
DROPOUT VOLTAGE (mV)
U
ULT1764A Series
ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage ........................................................ 20V Output Short-Circuit Duration ......................... Indefinite
OUT Pin Voltage .................................................... 20V Operating Junction Temperature Range
Input to Output Differential Voltage (Note 12) ....... 20V E Grade............................................. 40C to 125C
SENSE Pin Voltage ............................................... 20V MP Grade ......................................... 55C to 125C
ADJ Pin Voltage ...................................................... 7V Storage Temperature Range ................. 65C to 150C
SHDN Pin Voltage ................................................. 20V Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW
FRONT VIEW FRONT VIEW
GND 1 16 GND
SENSE/
5 SENSE/ADJ* 5
ADJ*
NC 2 15 NC
4 OUT 4 OUT
3
OUT 14 IN
TAB IS
3
3 GND GND
GND OUT 4 13 IN *PIN 6 = SENSE FOR LT1764A-1.5/
17
2 IN
2 IN
LT1764A-1.8/LT1764A-2.5/
OUT 5 12 IN
1
1 SHDN SHDN
LT1764A-3.3
SENSE/ADJ* 6 11 NC
= ADJ FOR LT1764A
TAB IS T PACKAGE
Q PACKAGE
GND 7 10 SHDN
GND 5-LEAD PLASTIC TO-220
5-LEAD PLASTIC DD
8
GND 9 GND
*PIN 5 = SENSE FOR LT1764A-1.5/LT1764A-1.8/
*PIN 5 = SENSE FOR LT1764A-1.5/LT1764A-1.8/
FE PACKAGE
LT1764A-2.5/LT1764A-3.3
LT1764A-2.5/LT1764A-3.3
16-LEAD PLASTIC TSSOP
= ADJ FOR LT1764A
= ADJ FOR LT1764A
PIN 17 IS GND
T = 150C, = 50C/ W
T = 150C, = 30C/ W JMAX JA
JMAX JA
T = 150C, = 38C/ W
JMAX JA
ORDER PART NUMBER ORDER PART NUMBER ORDER PART NUMBER FE PART MARKING
LT1764AEQ LT1764AET LT1764AEFE LT1764AEFE
LT1764AEQ-1.5 LT1764AET-1.5 LT1764AEFE-1.5 LT1764AEFE-1.5
LT1764AEQ-1.8 LT1764AET-1.8 LT1764AEFE-1.8 LT1764AEFE-1.8
LT1764AEQ-2.5 LT1764AET-2.5 LT1764AEFE-2.5 LT1764AEFE-2.5
LT1764AEQ-3.3 LT1764AET-3.3 LT1764AEFE-3.3 LT1764AEFE-3.3
LT1764AMPQ
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: