LT1529CT-3.3 Linear Technology, LT1529CT-3.3 Datasheet

IC LDO REG W/SHTDN 3.3V 3A TO220

LT1529CT-3.3

Manufacturer Part Number
LT1529CT-3.3
Description
IC LDO REG W/SHTDN 3.3V 3A TO220
Manufacturer
Linear Technology
Datasheet

Specifications of LT1529CT-3.3

Regulator Topology
Positive Fixed
Voltage - Output
3.3V
Voltage - Input
Up to 15V
Voltage - Dropout (typical)
0.6V @ 3A
Number Of Regulators
1
Current - Output
3A
Current - Limit (min)
3.2A
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
All other trademarks are the property of their respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Dropout Voltage: 0.6V at I
Output Current: 3A
Quiescent Current: 50µA
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
Stable with 22µF Output Capacitor
Reverse Battery Protection
No Reverse Current
Thermal Limiting
High Efficiency Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
5V to 3.3V Logic Regulator
V
IN
Q
> 5.5V
= 16µA
5V Supply with Shutdown
U
V
5
4
SHDN
< 0.25
V
SHDN
> 2.8
NC
IN
LT1529-5
(PIN 4)
GND
OUTPUT
SENSE
3
OUT
OUTPUT
OFF
ON
ON
U
= 3A
1
2
+
LT1529 • TA01
22µF
5V
3A
3A Low Dropout Regulators
DESCRIPTIO
The LT
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,
50µA operating and 16µA 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 22µF on the output while most older
devices require up to 100µF for stability. 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 re-
verse 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 16µA
will flow from the OUTPUT pin to ground. The devices are
available in 5-lead TO-220 and 5-lead DD packages.
®
1529/LT1529-3.3/LT1529-5 are 3A low dropout
0.6
0.5
0.1
0.4
0.3
0.2
0
0
Quiescent Current
0.5
U
LT1529-3.3/LT1529-5
with Micropower
Dropout Voltage
OUTPUT CURRENT (A)
1.0
and Shutdown
1.5
2.0
2.5
LT1529 • TA02
3.0
LT1529
152935fb
1

Related parts for LT1529CT-3.3

LT1529CT-3.3 Summary of contents

Page 1

... High Efficiency Regulator ■ Regulator for Battery-Powered Systems ■ Post Regulator for Switching Supplies ■ 3.3V Logic Regulator , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO 5V Supply with Shutdown ...

Page 2

... LOAD 1mA to 3A 4.8V ∆I LOAD IN = 25° 25°C J ORDER PART NUMBER SHDN 3 GND LT1529CT 2 SENSE/ADJ* LT1529CT-3.3 1 OUTPUT LT1529CT-5 LT1529IT LT1529IT-3.3 LT1529IT-5 ≈ 50° 25°C. (Note 3) A MIN TYP MAX 3.250 3.300 3.350 ● 3.200 3.300 3.400 4.925 5.000 5.075 ● ...

Page 3

ELECTRICAL C HARA TERISTICS C The ● denotes specifications which apply over the operating temperature range, otherwise specificatons are at T PARAMETER Dropout Voltage (Note 6) GND Pin Current (Note 7) ADJ Pin Bias Current (Notes 5, 9) Shutdown Threshold ...

Page 4

LT1529 LT1529-3.3/LT1529 TYPICAL PERFOR A Guaranteed Dropout Voltage 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 = TEST POINT 0 0 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) LT1529 • G01 LT1529-3.3 Quiescent Current 250 ...

Page 5

W U TYPICAL PERFOR A LT1529-3.3 GND Pin Current 5 25° OUT SENSE *FOR V = 3.3V OUT R = 6.6Ω 4.0 LOAD I = 500mA* LOAD 3.5 3 330Ω LOAD ...

Page 6

LT1529 LT1529-3.3/LT1529 TYPICAL PERFOR A SHDN Pin Current SHDN – 125 –25 100 TEMPERATURE (°C) LT1529 • G19 Reverse ...

Page 7

W U TYPICAL PERFOR A Load Regulation 5 LT1529-5 0 LT1529-3.3 –5 LT1529 –10 – (NOMINAL OUT –20 = 100mA to 3A ∆I LOAD ADJ OUT –25 – 50 – 25 ...

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 ...

Page 9

PPLICATI S I FOR ATIO Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125°C). The power dissipated by the device will be made up of two ...

Page 10

LT1529 LT1529-3.3/LT1529 PPLICATI S I FOR ATIO micropower device and output transient response will be a function of output capacitance. See the Transient Re- sponse curves in the Typical Performance Characteristics. Larger values of output capacitance ...

Page 11

... RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights will typically drop to less than 2µ ...

Page 12

... TYP .095 – .115 (2.413 – 2.921) .155 – .195* (3.937 – 4.953) .013 – .023 (0.330 – 0.584) * MEASURED AT THE SEATING PLANE T5 (TO-220) 0801 Low Dropout Regulator LT/LT 0305 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1995 152935fb ...

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