LTC3025-1_1 LINER [Linear Technology], LTC3025-1_1 Datasheet

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LTC3025-1_1

Manufacturer Part Number
LTC3025-1_1
Description
500mA Micropower VLDO Linear Regulators Fast Transient Recovery
Manufacturer
LINER [Linear Technology]
Datasheet
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: 85mV at 500mA
Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)
Fixed Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3),
1.8V (LTC3025-4)
±2% Voltage Accuracy over Temperature,
Supply and 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
LTC3025-2
SENSE
GND
OUT
BIAS
BIAS
IN
and V
= 50µA Typ
= 0.01µA Typ
30251234 TA01
BIAS
1µF
V
I
OUT
OUT
≤ 500mA
= 1.2V
DescripTion
The LTC
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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 7224204, 7218082.
VLDO Linear Regulators
®
3025-X is a micropower, VLDO™ (very low drop-
LTC3025-1/LTC3025-2/
LTC3025-3/LTC3025-4
50
45
40
35
30
25
20
15
10
500mA 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
2.2
I
I
OUT
OUT
= 100mA
= 300mA
30251234 TA01b
2.4
2.6
30251234ff
1

Related parts for LTC3025-1_1

LTC3025-1_1 Summary of contents

Page 1

... The LTC3025-X is available in a tiny, low profile (0.75mm) 6-lead DFN (2mm × 2mm) package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO and ThinSOT are trademarks of Linear Technology Corporation ...

Page 2

... For more information on tape and reel specifications, go to: 2 pin conFiguraTion + 0. EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB *ADJ FOR LTC3025-1, SENSE FOR LTC3025-2, LTC3025-3, LTC3025-4 PART MARKING* PACKAGE DESCRIPTION LDDW 6-Lead (2mm × 2mm) Plastic DFN LDDW 6-Lead (2mm × 2mm) Plastic DFN LDMK 6-Lead (2mm × ...

Page 3

... LTC3025-4 OUT IN ≤ 500mA, 2.0V ≤ V ≤ 5V, LTC3025-4 OUT IN = 0.45V, LTC3025-1 ADJ = 1mA to 500mA, LTC3025-1 OUT = 1mA to 500mA, LTC3025-2 OUT = 1mA to 500mA, LTC3025-3 OUT = 1mA to 500mA, LTC3025-4 OUT = 1. 3.6V 1.2V, IN BIAS OUT = 1mA, LTC3025-1 OUT = 1. 3.6V 1mA, LTC3025-2 IN BIAS OUT = 1 ...

Page 4

... SENSE = 300mA OUT Note 4: For the LTC3025-1, a regulated output voltage will only be available when the minimum IN and BIAS operating voltages as well as the IN to OUT and BIAS to OUT dropout voltages are all satisfied. For the LTC3025-2/LTC3025-3/LTC3025-4 the minimum IN operating voltage ...

Page 5

... Current Limit vs V Voltage IN 1600 1400 1200 1000 800 600 400 200 125 V (V) IN LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025 25°C unless otherwise noted) A BIAS No Load Operating Current 1. 1.2V V OUT 70 60 125°C 50 –40°C 40 –40° ...

Page 6

... OUT 3.6V 5 BIAS V = 1.2V OUT 0 2.0 1.2 1.4 1.6 1.8 1M 10M V (V) IN 30251234 G11 Dropout Voltage IN OUT vs V (90°C) LTC3025-1 IN 0.300 0.275 0.250 0.225 0.200 0.175 0.150 BIAS = 3.8V 0.125 0.100 0.075 BIAS = 3.3V = 0.385 0.050 BIAS = 3V = 500mA 0.025 BIAS = 2. 25° 4 1.5 2 2.5 V ...

Page 7

... LTC3025-1/LTC3025-2/ See the Applications Information section for more informa- tion on output capacitance. ADJ (Pin 5) LTC3025-1: Adjust Input. This is the input to the error amplifier. The ADJ pin reference voltage is 0.4V referenced to ground. The output voltage range is 0.4V to 3.6V and is typically set by connecting ADJ to a resistor divider from OUT to GND ...

Page 8

... Figure 2. Note that in shutdown the output is turned off and the divider current will be zero once C is discharged. OUT The LTC3025-1 operates at a relatively high gain of –0.7µV/ mA referred to the ADJ input. Thus a load current change = 4µA, of 1mA to 500mA produces a –0.35mV drop at the ADJ IN = 0.01µ ...

Page 9

... Output Capacitance and Transient Response The LTC3025-X 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 capacitor of 1µF with an ESR of 0.05Ω or less is recommended to ensure stability. The LTC3025 micropower device and output transient response will be a function of output capacitance ...

Page 10

... LDO when the junction temperature exceeds approximately 150°C. It will re enable the LDO once the junction temperature drops back to approximately 140°C. The LTC3025-X will cycle in and out of thermal shutdown without latch-up or damage until the overstress condition is removed. Long term overstress (T should be avoided as it can degrade the performance or shorten the life of the part ...

Page 11

... Soft-Start Operation The LTC3025-X includes a soft-start feature to prevent excessive current flow during start-up. When the LDO is enabled, the soft-start circuitry gradually increases the LDO reference voltage from 0V to 0.4V over a period of about 600µs. There is a short 700µs delay from the time the part is enabled until the LDO output starts to rise ...

Page 12

... LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 package DescripTion 2.55 ±0.05 0.61 ±0.05 1.15 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 BAR TOP MARK (SEE NOTE 6) 0.200 REF 12 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 ...

Page 13

... Added (Note 3) notation to “The Updated Pin 7 in Pin Functions Added “V Start-Up and Supply Sequencing” section OUT Updated Related Parts section F 04/11 Updated y-axis on graphs G14 and G15 LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 denotes” statement in Electrical Characteristics section l PAGE NUMBER 30251234ff ...

Page 14

... C OUT GND 10µF * MURATA LQH32CN2R2M33 CER ** TAIYO YUDEN JMK212BJ475MG † TAIYO YUDEN JMK316BJ106ML Efficiency vs Output Current 100 V = 3.6V IN LTC3406-1 1.5V OUT 90 80 LTC3025 1.2V OUT 0 100 OUTPUT CURRENT (mA) 30251234 TA03 COMMENTS V : 1.8V to 20V OUT(MIN Adj, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V, 5V, ThinSOT OUT Low Noise < 20µV ...

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