LT1529-3.3

Manufacturer Part NumberLT1529-3.3
Description3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown
ManufacturerLinear Technology
LT1529-3.3 datasheet
 


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FEATURES
Dropout Voltage: 0.6V at I
= 3A
OUT
Output Current: 3A
Quiescent Current: 50 A
No Protection Diodes Needed
Adjustable Output from 3.8V to 14V
3.3V and 5V Fixed Output Voltages
Controlled Quiescent Current in Dropout
Shutdown I
= 16 A
Q
Stable with 3.3 F Output Capacitor
Reverse Battery Protection
No Reverse Current
Thermal Limiting
U
APPLICATIO S
High Efficiency Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
5V to 3.3V Logic Regulator
U
TYPICAL APPLICATIO
5V Supply with Shutdown
5
1
V
OUTPUT
IN
LT1529-5
V
> 5.5V
IN
4
2
SHDN
SENSE
GND
3
V
(PIN 4)
OUTPUT
SHDN
< 0.25
OFF
> 2.8
ON
NC
ON
3A Low Dropout Regulators
DESCRIPTIO
®
The LT
1529/LT1529-3.3/LT1529-5 are 3A low dropout
regulators with micropower quiescent current and shut-
down. The devices are capable of supplying 3A of output
current with a dropout voltage of 0.6V. Designed for use
in battery-powered systems, the low quiescent current,
50 A operating and 16 A in shutdown, make them an
ideal choice. The quiescent current is well controlled; it
does not rise in dropout as it does with many other low
dropout PNP regulators.
Other features of the LT1529 /LT1529-3.3/LT1529-5 in-
clude the ability to operate with small output capacitors.
They are stable with only 3.3 F on the output while most
older devices require between 10 F and 100 F for stabil-
ity. Small ceramic capacitors can be used, enhancing
manufacturabiltiy. Also the input may be connected to
voltages lower than the output voltage, including negative
voltages, without reverse current flow from output to
input. This makes the LT1529/LT1529-3.3/LT1529-5 ideal
for backup power situations where the output is held high
and the input is at ground or reversed. Under these
conditions, only 16 A will flow from the OUTPUT pin to
ground. The devices are available in 5-lead TO-220 and
5-lead DD packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
0.6
0.5
5V
0.4
+
3A
3.3 F
SOLID
0.3
TANT
0.2
0.1
0
LT1529 • TA01
LT1529
LT1529-3.3/LT1529-5
with Micropower
Quiescent Current
and Shutdown
U
Dropout Voltage
0
1.0
1.5
2.0
2.5
3.0
0.5
OUTPUT CURRENT (A)
LT1529 • TA02
1

LT1529-3.3 Summary of contents

  • Page 1

    ... The quiescent current is well controlled; it does not rise in dropout as it does with many other low dropout PNP regulators. Other features of the LT1529 /LT1529-3.3/LT1529-5 in- clude the ability to operate with small output capacitors. They are stable with only 3 the output while most older devices require between 10 F and 100 F for stabil- ity ...

  • Page 2

    ... W U ORDER PART FRONT VIEW NUMBER TAB IS LT1529CQ GND LT1529CQ-3.3 LT1529CQ-5 T PACKAGE LT1529IQ 5-LEAD PLASTIC TO-220 LT1529IQ-3.3 *PIN 2 = SENSE FOR LT1529-3.3/LT1529-5 LT1529IQ-5 = ADJ FOR LT1529 T = 125 C, JMAX V = 3.8V 1mA OUT J 4.3V < V < 15V, 1mA < I < 3A ...

  • Page 3

    ... SHDN pin current (5 A) and the GND pin current (10 A). Note 12: Reverse output current is tested with the V the OUTPUT pin forced to the rated output voltage. This current flows into the OUTPUT pin and out of the GND pin. LT1529 LT1529-3.3/LT1529 (Note 3) A MIN TYP ...

  • Page 4

    ... OPEN (HIGH) SHDN 125 100 SHDN INPUT VOLTAGE (V) LT1529 • G04 LT1529-3.3 Output Voltage 3.400 I = 1mA LOAD 3.375 3.350 3.325 3.300 3.275 3.250 3.225 3.200 – 50 – 100 TEMPERATURE ( C) LT1529 • G07 ...

  • Page 5

    ... LOAD 2.2 LOAD I = 1.5A* 20 LOAD INPUT VOLTAGE (V) LT1529 • G13 GND Pin Current 100 V = 3.75V (LT1529 3.3V (LT1529-3. (LT1529- DEVICE IS OPERATING IN DROPOUT 125 – 0.5 1.0 1.5 2.0 2.5 3 ...

  • Page 6

    ... OUT SENSE (LT1529-3.3/LT1529- (LT1529) OUT ADJ CURRENT FLOWS 70 INTO DEVICE 60 LT1529 LT1529-3.3 20 LT1529 OUTPUT VOLTAGE (V) LT1529 • G25 HARA TERISTICS C SHDN Pin Input Current 25 20 ...

  • Page 7

    ... SENSE (Pin 2): SENSE Pin. For fixed voltage versions of the LT1529 (LT1529-3.3, LT1529-5) the SENSE pin is the input to the error amplifier. Optimum regulation will be obtained at the point where the SENSE pin is connected to the output pin. For most applications the SENSE pin is connected directly to the OUTPUT pin at the regulator ...

  • Page 8

    ... LT1529 LT1529-3.3/LT1529 CTIO S function of voltage appears in the Typical Performance Characteristics. If the SHDN pin is not used it can be left open circuit. The device will be active, output on, if the SHDN pin is not connected. V (Pin 5): Input Pin. Power is supplied to the device IN through the V pin ...

  • Page 9

    ... T JMAX Output Capacitance and Transient Performance The LT1529 is designed to be stable with a wide range of output capacitors. The minimum recommended value is 3.3 F with an ESR of 2 LT1529 LT1529-3.3/LT1529-5 THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) BACKSIDE BOARD AREA 23 C/W 25 C/W 2500 sq. mm 2500 sq C/W • ...

  • Page 10

    ... Output Current = 0 100 OUT SENSE (LT1529-3.3/LT1529- (LT1529) OUT ADJ CURRENT FLOWS 70 INTO DEVICE 60 LT1529 LT1529-3.3 20 LT1529 OUTPUT VOLTAGE (V) LT1529 • F03 Figure 3. Reverse Output Current pin is IN ...

  • Page 11

    ... LT1529 LT1529-3.3/LT1529 3.3V (LT1529-3.3) OUT (LT1529-5) OUT 4 LT1529-3.3 LT1529 ...

  • Page 12

    ... LT1529 LT1529-3.3/LT1529-5 PACKAGE DESCRIPTIO 0.390 – 0.415 (9.906 – 10.541) 0.460 – 0.500 (11.684 – 12.700) 0.057 – 0.077 0.028 – 0.038 (1.448 – 1.956) (0.711 – 0.965) RELATED PARTS PART NUMBER DESCRIPTION LT1120A 125mA Low Dropout Regulator with ® ...