ltc3025edc-4 Linear Technology Corporation, ltc3025edc-4 Datasheet

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ltc3025edc-4

Manufacturer Part Number
ltc3025edc-4
Description
500ma Micropower Vldo Linear Regulators
Manufacturer
Linear Technology Corporation
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: 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 effi ciency regulation. The LTC3025-1
features an adjustable output with a low 0.4V reference
while the LTC3025-2, LTC3025-3, and LTC3025-4 have
fi xed 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 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-X 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.
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
I
I
2.2
OUT
OUT
= 100mA
= 300mA
30251234 TA01b
2.4
2.6
30251234fc
1

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ltc3025edc-4 Summary of contents

Page 1

... The LTC3025-X 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. ...

Page 2

... LTC3025EDC-3 LTC3025EDC-3#TR LTC3025IDC-3 LTC3025IDC-3#TR LTC3025EDC-4 LTC3025EDC-4#TR LTC3025IDC-4 LTC3025IDC-4#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 cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T (all capacitors ceramic) unless otherwise noted. PARAMETER CONDITIONS V Operating Voltage (Note 4) LTC3025-1 BIAS LTC3025-2 LTC3025-3 LTC3025-4 V Undervoltage Lockout BIAS V Operating Current Operating Current ...

Page 4

LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T (all capacitors ceramic) unless otherwise noted. PARAMETER CONDITIONS SHDN Input High Voltage V IH SHDN Input Low Voltage V IL SHDN Input High Current SHDN = 1.2V I ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS V No Load Operating Current BIAS V = 0.8V OUT 12 10 125°C 8 85°C 6 25°C –40° 0.5 1.5 2.5 3.5 4.5 V (V) IN 30251234 G04 SHDN ...

Page 6

LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 TYPICAL PERFORMANCE CHARACTERISTICS Transient Response 250mA I OUT 10mA V OUT AC 10mV/DIV 30251234 G13 V = 1.5V 100μs/DIV 1.2V OUT V = 3.6V BIAS C = 1μF OUT PIN FUNCTIONS BIAS (Pin 1): BIAS ...

Page 7

BLOCK DIAGRAM LTC3025-1 BIAS 1 SOFT-START REFERENCE SHDN SHDN 6 0.4V GND 2 APPLICATIONS INFORMATION Operation (Refer to Block Diagram) The LTC3025 micropower, VLDO (very low dropout) linear regulator which operates from input voltages as low as 0.9V. ...

Page 8

LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 APPLICATIONS INFORMATION in R1 should be at least 8μA, thus the value of R1 should be no greater than 50k. The current the current in R1 plus the ADJ pin bias current. Since the ADJ ...

Page 9

APPLICATIONS INFORMATION much as 75% of its intial capacitance over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are usually more suitable for use as the output capacitor. The X7R type has better ...

Page 10

LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 APPLICATIONS INFORMATION 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. Soft-Start Operation The LTC3025-X includes ...

Page 11

... TOP AND BOTTOM OF PACKAGE 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. LTC3025-1/LTC3025-2/ DC Package 6-Lead Plastic DFN (2mm × ...

Page 12

... LDO LTC3025 300mA Micropower VLDO Linear Regulator LTC3026 1.5A, Low Input Voltage VLDO Regulator LT3080/LT3080-1 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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