LTC3025EDC-2 Linear Technology Corporation, LTC3025EDC-2 Datasheet

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LTC3025EDC-2

Manufacturer Part Number
LTC3025EDC-2
Description
Manufacturer
Linear Technology Corporation
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3025EDC-2
Manufacturer:
LT
Quantity:
10 000
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: 75mV at 500mA
Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)
Fixed Output: 1.2V (LTC3025-2)
±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
LTC3025-2
SENSE
GND
OUT
BIAS
BIAS
IN
and V
= 50μA Typ
= 0.01μA Typ
302512 TA01
BIAS
1μF
V
I
OUT
OUT
≤ 500mA
= 1.2V
DESCRIPTION
The LTC
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 75mV. 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 has a fi xed 1.2V
output voltage.
The LTC3025-1/LTC3025-2’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 LTC3025-1/LTC3025-2 is available in a tiny, low profi le
(0.75mm) 6-lead DFN (2mm × 2mm) package.
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
VLDO Linear Regulator
3025-1/LTC3025-2 is a micropower, VLDO™ (very
LTC3025-1/LTC3025-2
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
302512 TA01b
2.4
2.6
302512fa
1

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LTC3025EDC-2 Summary of contents

Page 1

... The LTC3025-1/LTC3025-2 is available in a tiny, low profi le (0.75mm) 6-lead DFN (2mm × 2mm) package. , 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

... LEAD BASED FINISH TAPE AND REEL LTC3025EDC-1 LTC3025EDC-1#TR LTC3025EDC-2 LTC3025EDC-2#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. 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 0.1μF (all capacitors ceramic) unless otherwise noted. BIAS PARAMETER OUT Load Regulation (Referred to ADJ Pin) OUT Load Regulation V Line Regulation (Referred to ADJ Pin ...

Page 4

LTC3025-1/LTC3025-2 TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage IN OUT vs I OUT 120 V = 2.8V BIAS V = 1.4V IN 100 T = 125° 25° –40° ...

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

LTC3025-1/LTC3025-2 PIN FUNCTIONS BIAS (Pin 1): BIAS Input Voltage. BIAS provides internal power for LTC3025-1/LTC3025-2 circuitry. The BIAS pin should be locally bypassed to ground if the LTC3025-1/ LTC3025-2 is more than a few inches away from another source of ...

Page 7

APPLICATIONS INFORMATION Operation (Refer to Block Diagram) The LTC3025-1/LTC3025 micropower, VLDO (very low dropout) linear regulator which operates from input voltages as low as 0.9V. The device provides a highly accurate output that is capable of supplying 500mA ...

Page 8

LTC3025-1/LTC3025-2 APPLICATIONS INFORMATION Output Capacitance and Transient Response The LTC3025-1/LTC3025-2 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 ...

Page 9

APPLICATIONS INFORMATION The LTC3025-1/LTC3025-2 2mm × 2mm DFN package is specifi having 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 package ...

Page 10

LTC3025-1/LTC3025-2 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

... SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE 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. DC Package 6-Lead Plastic DFN (2mm × ...

Page 12

... Dual, 2 × 100mA, Low Noise Micropower, LDO LT3024 Dual 100mA/500mA, Low Noise Micropower, LDO LTC3025 300mA Micropower VLDO Linear Regulator LTC3026 1.5A, Low Input Voltage VLDO Regulator ThinSOT is a trademark of Linear Technology Corporation. 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● COMMENTS ...

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