LTC3025EDC LINER [Linear Technology], LTC3025EDC Datasheet

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LTC3025EDC

Manufacturer Part Number
LTC3025EDC
Description
300mA Micropower VLDO Linear Regulator
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
3-CELL
Li-Ion
NiMH
OR
Wide Input Voltage Range: 0.9V to 5.5V
Stable with Ceramic Capacitors
Very Low Dropout: 45mV at 300mA
Adjustable Output Range: 0.4V to 3.6V
±2% Voltage Accuracy over Temperature
Supply Load
Low Noise: 80μV
BIAS Voltage Range: 2.5V to 5.5V
Fast Transient Recovery
Shutdown Disconnects Load from V
Low Operating Current: I
Low Shutdown Current: I
Output Current Limit
Thermal Overload Protection
Available in 6-Lead (2mm × 2mm) DFN Package
Low Power Handheld Devices
Low Voltage Logic Supplies
DSP Power Supplies
Cellular Phones
Portable Electronic Equipment
Handheld Medical Instruments
Post Regulator for Switching Supply Noise Rejection
EFFICIENCY
1.5V HIGH
DC/DC
BUCK
1.2V Output Voltage from 1.5V Input Supply
1.5V
RMS
OFF ON
0.1μF
0.1μF
(10Hz to 100kHz)
IN
IN
BIAS
IN
SHDN
= 4μA, I
= 1μA, I
LTC3025
GND
OUT
ADJ
BIAS
BIAS
IN
and V
= 50μA Typ
= 0.01μA Typ
80.6k
40.2k
3025 TA01
BIAS
1μF
V
I
OUT
OUT
≤ 300mA
= 1.2V
DESCRIPTION
The LTC
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 reference and
LDO circuitry while output current comes directly from
the IN supply for high effi ciency 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.
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 effi ciency buck regulator, providing
a high effi ciency, 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 is available in a tiny, low profi le (0.75mm)
6-lead DFN (2mm × 2mm) package.
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.
VLDO Linear Regulator
®
3025 is a micropower, VLDO
50
45
40
35
30
25
20
15
10
300mA Micropower
5
0
1.2
1MHz V
BIAS = 3.6V
V
OUT
1.4
= 1.2V
IN
1.6
Supply Rejection
C
C
OUT
1.8
OUT
V
IN
= 10μF
= 1μF
(V)
2.0
I
I
2.2
OUT
OUT
= 100mA
= 300mA
TM
2.4
LTC3025
3025 TA01b
(very low drop-
2.6
3025fb
1

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LTC3025EDC Summary of contents

Page 1

FEATURES n Wide Input Voltage Range: 0.9V to 5.5V n Stable with Ceramic Capacitors n Very Low Dropout: 45mV at 300mA n Adjustable Output Range: 0.4V to 3.6V ±2% Voltage Accuracy over Temperature n Supply Load n Low Noise: 80μV ...

Page 2

... LTC3025IDC#TRPBF LEAD BASED FINISH TAPE AND REEL LTC3025EDC LTC3025EDC#TR LTC3025IDC LTC3025IDC#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are 0.1μF (all capacitors ceramic) unless otherwise noted. BIAS PARAMETER BIAS Line Regulation (Referred to ADJ Pin Dropout Voltage (Notes OUT V ...

Page 4

LTC3025 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage vs I OUT 2.8V BIAS 125° 25° –40° 100 150 200 250 I ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS V Ripple Rejection IN vs Frequency OUT 3.6V BIAS 1.2V OUT I = 100mA OUT 0 100 1k 10k 100k FREQUENCY ...

Page 6

LTC3025 PIN FUNCTIONS BIAS (Pin 1): BIAS Input Voltage. BIAS provides internal power for LTC3025 circuitry. The BIAS pin should be lo- cally bypassed to ground if the LTC3025 is more than a few inches away from another source of ...

Page 7

APPLICATIONS INFORMATION Operation (Refer to Block Diagram) The LTC3025 is a micropower, VLDO (very low dropout) linear regulator which operates from input voltages as low as 0.9V. The device provides a high accuracy output that is capable of supplying 300mA ...

Page 8

LTC3025 APPLICATIONS INFORMATION Output Capacitance and Transient Response The LTC3025 is designed to be stable with a wide range of ceramic output capacitors. The ESR of the output capaci- tor affects stability, most notably with small capacitors. A minimum output ...

Page 9

APPLICATIONS INFORMATION The LTC3025 2mm × 2mm DFN package is specifi hav- ing a junction-to-ambient thermal resistance of 102°C/W, which assumes a minimal heat spreading copper plane. The actual thermal resistance can be reduced substantially by connecting the ...

Page 10

LTC3025 TYPICAL APPLICATION High Effi ciency 1.5V Step-Down Converter with Effi cient 1.2V VLDO Output OFF 2. 5. 4.7μF LTC3406-1.5 CER 1 RUN * MURATA LQH32CN2R2M33 ** TAIYO YUDEN JMK212BJ475MG ...

Page 11

PACKAGE DESCRIPTION 2.50 0.05 0.61 0.05 1.15 0.05 (2 SIDES) 0.50 BSC 1.42 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO ...

Page 12

LTC3025 RELATED PARTS PART NUMBER DESCRIPTION ® LT 1129 700mA, Micropower, LDO LT1175 500mA, Micropower, Negative LDO LT1185 3A, Negative LDO LT1761 100mA, Low Noise Micropower, LDO LT1762 150mA, Low Noise Micropower LDO LT1763 500mA, Low Noise Micropower LDO LT1764/LT1764A ...

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