LT1529
LT1529-3.3/LT1529-5
3A Low Dropout Regulators
with Micropower
Quiescent Current
and Shutdown
FEATURES DESCRIPTIO
Dropout Voltage: 0.6V at I = 3A
OUT The LT 1529/LT1529-3.3/LT1529-5 are 3A low dropout
Output Current: 3A
regulators with micropower quiescent current and shut-
Quiescent Current: 50A
down. The devices are capable of supplying 3A of output
No Protection Diodes Needed
current with a dropout voltage of 0.6V. Designed for use
Adjustable Output from 3.8V to 14V
in battery-powered systems, the low quiescent current,
3.3V and 5V Fixed Output Voltages
50A operating and 16A in shutdown, make them an
Controlled Quiescent Current in Dropout
ideal choice. The quiescent current is well controlled; it
Shutdown I = 16A
Q does not rise in dropout as it does with many other low
Stable with 22F Output Capacitor
dropout PNP regulators.
Reverse Battery Protection
Other features of the LT1529 /LT1529-3.3/LT1529-5 in-
No Reverse Current
clude the ability to operate with small output capacitors.
Thermal Limiting
They are stable with 22F on the output while most older
devices require up to 100F for stability. Small ceramic
U
APPLICATIO S capacitors can be used, enhancing manufacturabiltiy.
Also the input may be connected to voltages lower than the
High Efficiency Regulator
output voltage, including negative voltages, without re-
Regulator for Battery-Powered Systems
verse current flow from output to input. This makes the
Post Regulator for Switching Supplies
LT1529/LT1529-3.3/LT1529-5 ideal for backup power
5V to 3.3V Logic Regulator
situations where the output is held high and the input is at
, LTC and LT are registered trademarks of Linear Technology Corporation.
ground or reversed. Under these conditions, only 16A
All other trademarks are the property of their respective owners.
will flow from the OUTPUT pin to ground. The devices are
available in 5-lead TO-220 and 5-lead DD packages.
TYPICAL APPLICATIO
Dropout Voltage
0.6
5V Supply with Shutdown
0.5
5 1
5V
V OUTPUT
IN
3A
+
0.4
V > 5.5V LT1529-5
IN 22F
4 2
SHDN SENSE
0.3
GND
3
0.2
V (PIN 4) OUTPUT
SHDN
0.1
<0.25 OFF
>2.8 ON
0
NC ON
LT1529 TA01
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
LT1529 TA02
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DROPOUT VOLTAGE (V)
U
ULT1529
LT1529-3.3/LT1529-5
ABSOLUTEXAI U RATI GS (Note 1)
Input Voltage ...................................................... 15V*
Output Short-Circuit Duration ......................... Indefinite
OUTPUT Pin Reverse Current .............................. 10mA
Storage Temperature Range ................ 65C to 150C
SENSE Pin Current .............................................. 10mA Operating Junction Temperature Range
ADJ Pin Current ................................................... 10mA
Commercial .......................................... 0C to 125C
SHDN Pin Input Voltage (Note 2) .............. 6.5V, 0.6V
Industrial ......................................... 45C to 125C
SHDN Pin Input Current (Note 2) .......................... 5mA Lead Temperature (Soldering, 10 sec).................. 300C
*For applications requiring input voltage ratings greater than 15V, contact
the factory.
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
FRONT VIEW ORDER PART
ORDER PART
NUMBER 5 V NUMBER
IN
5 V
IN
4 SHDN
4 SHDN
TAB IS TAB IS
3 GND 3 GND
LT1529CQ LT1529CT
GND GND
2 SENSE/ADJ*
2 SENSE/ADJ*
LT1529CQ-3.3 LT1529CT-3.3
1 OUTPUT
1 OUTPUT
LT1529CQ-5 LT1529CT-5
Q PACKAGE T PACKAGE
LT1529IQ LT1529IT
5-LEAD PLASTIC DD PAK 5-LEAD PLASTIC TO-220
LT1529IQ-3.3 LT1529IT-3.3
*PIN 2 = SENSE FOR LT1529-3.3/LT1529-5 *PIN 2 = SENSE FOR LT1529-3.3/LT1529-5
= ADJ FOR LT1529 = ADJ FOR LT1529
LT1529IQ-5 LT1529IT-5
T = 125C, 30C/W T = 125C, 50C/W
JMAX JA JMAX JA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the operating temperature range, otherwise specificatons are at T = 25C. (Note 3)
A
PARAMETER CONDITIONS MIN TYP MAX UNITS
Regulated Output Voltage LT1529-3.3 V = 3.8V, I = 1mA, T = 25C 3.250 3.300 3.350 V
IN OUT J
(Note 4) 4.3V < V < 15V, 1mA < I < 3A 3.200 3.300 3.400 V
IN OUT
LT1529-5 V = 5.5V, I = 1mA, T = 25C 4.925 5.000 5.075 V
IN OUT J
6V < V < 15V, 1mA < I < 3A 4.850 5.000 5.150 V
IN OUT
LT1529 (Note 5) V = 4.3V, I = 1mA, T = 25C 3.695 3.750 3.805 V
IN OUT J
4.8V < V < 15V, 1mA < I < 3A 3.640 3.750 3.860 V
IN OUT
Line Regulation LT1529-3.3 V = 3.8V to 15V, I = 1mA 1.5 10 mV
IN OUT
LT1529-5 V = 5.5V to 15V, I = 1mA 1.5 10 mV
IN OUT
LT1529 (Note 5) V = 4.3V to 15V, I = 1mA 1.5 10 mV
IN OUT
Load Regulation LT1529-3.3 I = 1mA to 3A, V = 4.3V, T = 25C520mV
LOAD IN J
= 1mA to 3A, V = 4.3V 12 30 mV
I
LOAD IN
LT1529-5 I = 1mA to 3A, V = 6V, T = 25C520mV
LOAD IN J
I = 1mA to 3A, V = 6V 12 30 mV
LOAD IN
LT1529 (Note 5) I = 1mA to 3A, V = 4.8V, T = 25C520mV
LOAD IN J
I = 1mA to 3A, V = 4.8V 12 30 mV
LOAD IN
Dropout Voltage I = 10mA, T = 25C 110 180 mV
LOAD J
(Note 6) I = 10mA 250 mV
LOAD
I = 100mA, T = 25C 200 300 mV
LOAD J
I = 100mA 400 mV
LOAD
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U WU
U W W W