LT1528CQ#TRPBF Linear Technology, LT1528CQ#TRPBF Datasheet

IC LDO REG 3.3V/ADJ 3A DDPAK-5

LT1528CQ#TRPBF

Manufacturer Part Number
LT1528CQ#TRPBF
Description
IC LDO REG 3.3V/ADJ 3A DDPAK-5
Manufacturer
Linear Technology
Datasheet

Specifications of LT1528CQ#TRPBF

Regulator Topology
Positive Fixed and Adjustable
Voltage - Output
3.3V, 3.3 ~ 14.15 V
Voltage - Input
3.9 ~ 15 V
Voltage - Dropout (typical)
0.57V @ 3A
Number Of Regulators
1
Current - Output
3A
Current - Limit (min)
3.2A
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-5, D²Pak (5 leads + Tab), TO-263BA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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APPLICATIONS
n
n
n
TYPICAL APPLICATION
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
V
Microprocessor Applications
Post Regulator for Switching Supplies
5V to 3.3V Logic Regulator
Dropout Voltage: 0.6V at I
Fast Transient Response
Output Current: 3A
Quiescent Current: 400μA
No Protection Diodes Needed
Fixed Output Voltage: 3.3V
Controlled Quiescent Current in Dropout
Shutdown I
Stable with 3.3μF Output Capacitor
Reverse Battery Protection
No Reverse Output Current
Thermal Limiting
SHDN
V
<0.25
>2.80
IN
NC
(PIN 4)
=5V
5
4
IN
SHDN
OUTPUT
Q
Microprocessor Supply with Shutdown
OFF
ON
ON
= 125μA
LT1528
GND
3
SENSE
OUT
SHORTING
J1
J2
J3
1
2
OUT
J1
330Ω
= 3A
V
3.30
3.45
4.00
OUT
J2
15Ω
J3
*CHOOSE CAPACITORS
68Ω
TO MEET PROCESSOR
REQUIREMENTS
+
for Microprocessor Applications
V
4 × 47μF*
SOLID TANTALUM
1528 TA01
OUT
DESCRIPTION
3A Low Dropout Regulator
The LT
handle the large load current transients associated with
the current generation of microprocessors. This device has
the fastest transient response of currently available PNP
regulators and is very tolerant of variations in capacitor
ESR. Dropout voltage is 75mV at 10mA, rising to 300mV
at 1A and 600mV at 3A. The device has a quiescent cur-
rent of 400μA. Quiescent current is well controlled; it does
not increase signifi cantly as the device enters dropout.
The regulator can operate with output capacitors as small
as 3.3μF, although larger capacitors will be needed to
achieve the performance required in most microprocessor
applications. The LT1528 is available with a fi xed output
voltage of 3.3V. An external SENSE pin allows adjustment
to output voltages greater than 3.3V, using a simple resis-
tive divider. This allows the device to be adjusted over a
wide range of output voltages, including the 3.3V to 4.2V
range required by a variety of processors from Intel, IBM,
AMD, and Cyrix.
The LT1528 has both reverse input and reverse output
protection and includes a shutdown feature. Quiescent
current drops to 125μA in shutdown. The LT1528 is avail-
able in 5-lead TO-220 and 5-lead DD-PAK packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
®
1528 is a 3A low dropout regulator optimized to
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.5
Dropout Voltage
OUTPUT CURRENT (mA)
1.0
1.5
2.0
2.5
LT1528
3.0
1528 TA02
1528fb
1

Related parts for LT1528CQ#TRPBF

LT1528CQ#TRPBF Summary of contents

Page 1

... Quiescent current drops to 125μA in shutdown. The LT1528 is avail- able in 5-lead TO-220 and 5-lead DD-PAK packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. V OUT + 4 × ...

Page 2

... PLASTIC 125°C, θ = 30°C/ W JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT1528CQ#PBF LT1528CQ#TRPBF LT1528CT#PBF LT1528CT#TRPBF LEAD BASED FINISH TAPE AND REEL LT1528CQ LT1528CQ#TR LT1528CT LT1528CT#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T PARAMETER Dropout Voltage (Note 5) GND Pin Current (Note 6) SENSE Pin Current (Notes 4, 8) SHDN Threshold SHDN Pin Current (Note 9) Quiescent Current in Shutdown (Note 10) Ripple ...

Page 4

LT1528 TYPICAL PERFORMANCE CHARACTERISTICS Guaranteed Dropout Voltage 1.0 = TEST POINTS 0.9 0.8 0.7 T ≤ 125°C J 0.6 0.5 T ≤ 25°C J 0.4 0.3 0.2 0 0.5 1.5 2.0 2.5 1.0 OUTPUT CURRENT (A) 1528 TPC01 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS SHDN Pin Threshold (Off-to-On) 2.0 1 1.6 LOAD 1.4 1 1mA LOAD 1.0 0.8 0.6 0.4 0.2 0 – 125 –25 100 TEMPERATURE (°C) 1528 TPC10 SENSE Pin ...

Page 6

LT1528 TYPICAL PERFORMANCE CHARACTERISTICS Ripple Rejection × 47μF OUT SOLID TANTALUM 47μF OUT 30 SOLID TANTALUM 1.5A OUT 50mV RIPPLE IN RMS ...

Page 7

PIN FUNCTIONS SHDN (Pin 4): This pin is used to put the device into shutdown. In shutdown the output of the device is turned off. This pin is active low. The device will be shut down if the SHDN pin ...

Page 8

LT1528 APPLICATIONS INFORMATION The LT1528 is specifi ed with the SENSE pin tied to the OUTPUT pin. This sets the output voltage to 3.3V. Specifi cations for output voltage greater than 3.3V will be proportional to the ratio of the ...

Page 9

APPLICATIONS INFORMATION The maximum junction temperature will be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or 50°C + 31.4°C = 81.4°C JMAX Output Capacitance and Transient Performance The LT1528 is designed ...

Page 10

LT1528 APPLICATIONS INFORMATION The reverse output current will follow the curve in Figure 3 when the input is pulled to ground. This current fl ows through the OUTPUT pin to ground. The state of the SHDN pin will have no ...

Page 11

... DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. Q Package ...

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 LT 0508 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1995 1528fb ...

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