LTC3025
300mA Micropower
VLDO Linear Regulator
FEATURES
DESCRIPTION
The LTC®3025 is a micropower, VLDOTM (very low drop-
out) linear regulator which operates from input voltages
as low as 0.9V. The device is capable of supplying 300mA
of output current with a typical dropout voltage of only
45mV. A BIAS supply is required to run the internal refer-
ence and LDO circuitry while output current comes directly
from the IN supply for high efficiency regulation. The low
0.4V internal reference voltage allows the LTC3025 output
to be programmed to much lower voltages than available
in common LDOs (range of 0.4V to 3.6V). The output
voltage is programmed via two ultrasmall SMD resistors.
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Wide Input Voltage Range: 0.9V to 5.5V
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Stable with Ceramic Capacitors
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Very Low Dropout: 45mV at 300mA
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Adjustable Output Range: 0.4V to 3.6V
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±2% Voltage Accuracy over Temperature
Supply Load
Low Noise: 80µV
BIAS Voltage Range: 2.5V to 5.5V
Fast Transient Recovery
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(10Hz to 100kHz)
RMS
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Shutdown Disconnects Load from V and V
Low Operating Current: I = 4µA, I
Low Shutdown Current: I = 1µA, I
Output Current Limit
Thermal Overload Protection
Available in 6-Lead (2mm × 2mm) DFN Package
IN
BIAS
= 50µA Typ
= 0.01µA Typ
IN
BIAS
IN
BIAS
The LTC3025’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.
APPLICATIONS
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Low Power Handheld Devices
Other features include high output voltage accuracy,
excellent transient response, stability with ultralow ESR
ceramic capacitors as small as 1µF, short-circuit and ther-
mal overload protection and output current limiting. The
LTC3025 is available in a tiny, low profile (0.75mm) 6-lead
DFN (2mm × 2mm) package.
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Low Voltage Logic Supplies
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DSP Power Supplies
Cellular Phones
Portable Electronic Equipment
Handheld Medical Instruments
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Post Regulator for Switching Supply Noise Rejection
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
1MHz VIN Supply Rejection
50
1.2V Output Voltage from 1.5V Input Supply
45
40
35
30
25
20
15
10
5
C
= 10µF
OUT
V
I
= 1.2V
≤ 300mA
OUT
OUT
BIAS
OUT
ADJ
GND
C
= 1µF
OUT
0.1µF
1µF
Li-Ion
OR
3-CELL
NiMH
1.5V HIGH
EFFICIENCY
DC/DC
LTC3025
80.6k
1.5V
IN
BUCK
0.1µF
40.2k
OFF ON
SHDN
3025 TA01
BIAS = 3.6V
OUT
I
I
= 100mA
= 300mA
OUT
OUT
V
= 1.2V
0
1.2
1.6 1.8 2.0
(V)
2.2 2.4 2.6
1.4
V
IN
3025 TA01b
Rev. E
1
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