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LTC3025EDC-4-TRPBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3025EDC-4-TRPBF
Description  500mA Micropower VLDO Linear Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3025EDC-4-TRPBF Datasheet(HTML) 1 Page - Linear Technology

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LTC3025-1/LTC3025-2/
LTC3025-3/LTC3025-4
1
30251234fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
500mA Micropower
VLDO Linear Regulators
The LTC®3025-X is a micropower, VLDO™ (very low drop-
out) linear regulator which operates from input voltages as
low as 0.9V. The device is capable of supplying 500mA of
output current with a typical dropout voltage of only 85mV.
A BIAS supply is required to run the internal reference and
LDO circuitry while output current comes directly from the
IN supply for high efficiency regulation. The LTC3025-1
features an adjustable output with a low 0.4V reference
while the LTC3025-2, LTC3025-3, and LTC3025-4 have
fixed 1.2V, 1.5V and 1.8V output voltages respectively.
The LTC3025-X’s low quiescent current makes it an ideal
choice for use in battery-powered systems. For 3-cell NiMH
and single cell Li-Ion applications, the BIAS voltage can
be supplied directly from the battery while the input can
come from a high efficiency buck regulator, providing a
high efficiency, low noise output.
Other features include high output voltage accuracy,
excellent transient response, stability with ultralow ESR
ceramic capacitors as small as 1μF, short-circuit and
thermal overload protection and output current limiting.
The LTC3025-X is available in a tiny, low profile (0.75mm)
6-lead DFN (2mm × 2mm) package.
1.2V Output Voltage from 1.5V Input Supply
n Wide Input Voltage Range: 0.9V to 5.5V
n Stable with Ceramic Capacitors
n Very Low Dropout: 85mV at 500mA
n Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)
n Fixed Output: 1.2V(LTC3025-2), 1.5V(LTC3025-3),
1.8V(LTC3025-4)
n
±2% Voltage Accuracy over Temperature,
Supply and Load
n Low Noise: 80μVRMS (10Hz to 100kHz)
n BIAS Voltage Range: 2.5V to 5.5V
n Fast Transient Recovery
n Shutdown Disconnects Load from VIN and VBIAS
n Low Operating Current: IIN = 4μA, IBIAS = 50μA Typ
n Low Shutdown Current: IIN = 1μA, IBIAS = 0.01μA Typ
n Output Current Limit
n Thermal Overload Protection
n Available in 6-Lead (2mm
× 2mm) DFN Package
n Low Power Handheld Devices
n Low Voltage Logic Supplies
n DSP Power Supplies
n Cellular Phones
n Portable Electronic Equipment
n Handheld Medical Instruments
n Post Regulator for Switching Supply Noise Rejection
1MHz VIN Supply Rejection
LTC3025-2
BIAS
0.1μF
1.5V
1μF
0.1μF
Li-Ion
OR
3-CELL
NiMH
IN
SHDN
OUT
VOUT = 1.2V
IOUT ≤ 500mA
30251234 TA01
SENSE
GND
OFF ON
1.5V HIGH
EFFICIENCY
DC/DC
BUCK
VIN (V)
1.2
0
5
15
20
25
50
35
1.6
2.0
2.2
30251234 TA01b
10
40
45
30
1.4
1.8
2.4
2.6
BIAS = 3.6V
VOUT = 1.2V
IOUT = 100mA
IOUT = 300mA
COUT = 1μF
COUT = 10μF
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 7224204, 7218082.


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