LT1764 Series
3A, Fast Transient
Response, Low Noise,
LDO Regulators
FEATURES
DESCRIPTIO
Optimized for Fast Transient Response
The LT 1764 is a low dropout regulator optimized for fast
Output Current: 3A
transient response. The device is capable of supplying 3A
Dropout Voltage: 340mV at 3A
of output current with a dropout voltage of 340mV. Oper-
Low Noise: 40V (10Hz to 100kHz)
RMS ating 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 LT1764 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 LT1764
<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-
Reverse Battery Protection
tection, current limiting, thermal limiting and reverse cur-
No Reverse Current
rent protection. The device is available in fixed output
Thermal Limiting
voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable
Available in 5-Lead TO-220, DD and 16-Lead
device with a 1.21V reference voltage. The LT1764 regu-
TSSOP Packages
lators are available in 5-lead TO-220, DD and Exposed Pad
U
16-lead TSSOP packages.
APPLICATIO S
, 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,
3.3V to 2.5V Logic Power Supply
including 6144250, 6118263.
Post Regulator for Switching Supplies
TYPICAL APPLICATIO
Dropout Voltage
400
3.3V to 2.5V Regulator 350
IN OUT
300
2.5V
250
IN OUT
3A
+ +
V > 3V 10F 10F
IN 200
LT1764-2.5
150
SHDN SENSE
100
GND
1764 TA01
50
0
0 0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1764 TA02
1764fb
1
DROPOUT VOLTAGE (mV)
U
ULT1764 Series
ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage ........................................................ 20V SHDN Pin Voltage ................................................. 20V
OUT Pin Voltage .................................................... 20V Output Short-Circuit Duration ......................... Indefinite
Input to Output Differential Voltage (Note 12) ....... 20V Operating Junction Temperature Range 40C to 125C
SENSE Pin Voltage ............................................... 20V Storage Temperature Range ................. 65C to 150C
ADJ Pin Voltage ...................................................... 7V Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW
GND 1 16 GND
FRONT VIEW
FRONT VIEW
NC 2 15 NC
SENSE/
5 SENSE/ADJ* 5 ADJ*
OUT 3 14 IN
4
4 OUT OUT
OUT 4 13 IN
TAB IS 17
3 GND 3 GND
GND OUT 5 12 IN
2
2 IN IN
SENSE/ADJ* 6 11 NC
1 SHDN
1 SHDN
GND 7 10 SHDN
Q PACKAGE TAB IS T PACKAGE
GND 8 9 GND
GND 5-LEAD PLASTIC TO-220
5-LEAD PLASTIC DD
FE PACKAGE
*PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/
*PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/
16-LEAD PLASTIC TSSOP
LT1764-2.5/LT1764-3.3
LT1764-2.5/LT1764-3.3 EXPOSED PAD (PIN 17) IS GND. MUST BE
= ADJ FOR LT1764 SOLDERED TO THE PCB.
= ADJ FOR LT1764
*PIN 6 = SENSE FOR LT1764-1.5/
T = 150C, = 50C/ W
T = 150C, = 30C/ W JMAX JA
JMAX JA
LT1764-1.8/LT1764-2.5/
LT1764-3.3
= ADJ FOR LT1764
T = 150C, = 38C/ W
JMAX JA
ORDER PART NUMBER ORDER PART NUMBER ORDER PART FE PART
MARKING
NUMBER
1764EFE
LT1764EQ LT1764ET LT1764EFE
1764EFE15
LT1764EQ-1.5 LT1764ET-1.5 LT1764EFE-1.5
1764EFE18
LT1764EQ-1.8 LT1764ET-1.8 LT1764EFE-1.8
1764EFE25
LT1764EQ-2.5 LT1764ET-2.5 LT1764EFE-2.5
1764EFE33
LT1764EQ-3.3 LT1764ET-3.3 LT1764EFE-3.3
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: