LTC3525-3.3 Linear Technology Corporation, LTC3525-3.3 Datasheet

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LTC3525-3.3

Manufacturer Part Number
LTC3525-3.3
Description
400mA Micropower Synchronous Step-Up DC/DC Converter
Manufacturer
Linear Technology Corporation
Datasheet
www.DataSheet4U.com
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
1V to 1.6V
V
MP3 Players
Portable Instruments
Glucose Meters
Digital Cameras
Up to 95% Efficiency
Output Disconnect and Inrush Current Limit
Fixed Output Voltages of 3.3V or 5V
Delivers 60mA at 3.3V from a 1V Input,
or 140mA at 3.3V from a 1.8V Input
Delivers 175mA at 5V from a 3V Input
Burst Mode
Only Three External Components
1V to 4.5V Input Range
<1µA Shutdown Current
Antiringing Control
Short-Circuit and Overtemperature Protection
Very low profile of 1mm
Tiny 6-Pin SC-70 Package
IN
1µF
OFF ON
®
Operation: I
U
*MURATA LQH32CN100K53
V
SHDN
GND
IN
Q
LTC3525-3.3
= 7µA
10µH
L1*
U
V
GND
OUT
SW
3525 TA01
Converter with Output Disconnect
10µF
V
3.3V
60mA
OUT
Synchronous Step-Up DC/DC
DESCRIPTIO
The LTC
chronous step-up DC/DC converters with output discon-
nect that can start up with an input as low as 1V. They offer
a compact, high efficiency alternative to charge pumps in
single cell or dual cell alkaline or Li-ion applications. Only
three small external components are required. The LTC3525
is offered in fixed output voltages of 3.3V or 5V.
The device includes a 0.5Ω N-channel MOSFET switch and
a 0.8Ω P-channel synchronous rectifier. Peak switch
current ranges from 150mA to 400mA, depending on load,
providing enhanced efficiency. Quiescent current is an
ultralow 7µA, maximizing battery life in portable applica-
tions.
Other features include <1µA shutdown current, anti-
ringing control and thermal shutdown. The LTC3525 is
available in a tiny 6-pin SC-70 package.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Patents Pending
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
3525-3.3/LTC3525-5 are high efficiency syn-
100
90
80
70
60
50
40
30
20
0.01
LTC3525-3.3/LTC3525-5
LTC3525-3.3 Efficiency and Power
400mA Micropower
0.1
EFFICIENCY
Loss vs Load Current
U
1
LOAD (mA)
POWER LOSS
10
V
V
V
100
IN
IN
IN
LT3525 • TA02
= 3V
= 2.4V
= 1.2V
1000
100
10
1
0.1
0.01
1
3525f

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LTC3525-3.3 Summary of contents

Page 1

... OUT 3.3V V OUT 60mA GND 10µF 3525 TA01 LTC3525-3.3/LTC3525-5 400mA Micropower U ® 3525-3.3/LTC3525-5 are high efficiency syn- , LTC and LT are registered trademarks of Linear Technology Corporation. LTC3525-3.3 Efficiency and Power Loss vs Load Current 100 90 80 EFFICIENCY 70 60 POWER LOSS ...

Page 2

... ORDER PART NUMBER Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. (LTC3525-3.3) = 3.3V unless otherwise noted. CONDITIONS (Note 6) SHDN = V ...

Page 3

... Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 6: Consult LTC Marketing for other output voltage options. LTC3525-3.3/LTC3525-5 = 25°C. A MIN TYP MAX 0 ...

Page 4

... TYPICAL PERFOR A CE CHARACTERISTICS Maximum Output Current vs V (for V to Drop 2.5%) OUT 350 300 250 LTC3525-3.3 200 LTC3525-5 150 www.DataSheet4U.com 100 50 0 0.5 1.0 1.5 2.0 2.5 3.0 V (V) IN LTC3525-3.3 Efficiency and Power Loss vs Load 100 90 80 EFFICIENCY 70 60 POWER LOSS 0.01 0 LOAD (mA) LTC3525-3.3 Load Regulation 2 2.4V IN 2.0 1.5 1 ...

Page 5

... A Light Load Burst Frequency vs Load LTC3525 OUT 3.5 4.0 4.5 0.1 LOAD (mA) 3525 G11 LTC3525-3.3 Input Current and V at Startup OUT OUT 1V/DIV INPUT CURRENT 100mA/DIV 500µs/DIV 3.5 4.0 4.5 3525 G14 LTC3525-3.3 Output Voltage Ripple I = OUT ...

Page 6

... OUT 5mA I = OUT 50mV/DIV 50mA I = OUT 3525 G19 50µs/DIV 22µF OUT LTC3525-3.3 50mA Load Step Response LOAD 3525 G21 500µs/DIV 22µF OUT LTC3525-5 100mA Load Step Response LOAD 3525 G23 500µs/DIV 22µ ...

Page 7

... STARTUP LOGIC I VAL TSD WAKE INTEGRATOR ADJUST 2 GND LTC3525-3.3/LTC3525-5 (Pin 4): Output Voltage Sense and the Output of the to GND, close to the IC. A minimum value of OUT from V when SHDN is <0.4V internal antiringing resistor is connected across IN after the inductor current has dropped to zero ...

Page 8

... LTC3525-3.3/LTC3525-5 U OPERATIO The LTC3525 is a high performance Burst Mode operation only, synchronous boost converter requiring only three small external components. Its simplicity and small size make it a high efficiency alternative to charge pump designs designed to start up from a single alkaline or nickel cell, with input voltages as low as 1V, or from two or three cells (or a Li-ion battery), with voltages as high as 4 ...

Page 9

... U OPERATIO www.DataSheet4U.com load using the minimum recommended 10µF output ca- pacitor for the LTC3525-3.3 and a 22µF capacitor for the LTC3525-5 (due to the capacitor’s DC bias effect). An antiring circuit damps any oscillation at the switch node when the inductor current falls to zero. Power Adjust Feature ...

Page 10

... LTC3525-3.3/LTC3525-5 U OPERATIO Component Selection Inductor values between 4.7µH and 15µH are recom- mended. In most applications 10µH will yield the best compromise between size and efficiency. The inductor should be a low-loss ferrite design and must be rated for peak currents of at least 400mA without saturating. Induc- tors with lower DC resistance will improve efficiency ...

Page 11

... 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC3525-3.3/LTC3525-5 2-Alkaline or NiMH to 3.3V 10µH* LTC3525-3.3 1. ...

Page 12

... LTC3525-3.3/LTC3525-5 TYPICAL APPLICATIO www.DataSheet4U.com RELATED PARTS PART NUMBER DESCRIPTION ® LT 1615/LT1615-1 300mA/80mA (I LTC1751-3.3/ 100mA, 800kHz, Micropower, Regulated Charge Pump LTC1751-5 DC/DC Converters LT1930/LTC1930A 1.2MHz/2MHz, High Efficiency Step-Up DC/DC Converter SW LTC3200-5 100mA, 2MHz, Regulated 5V Charge Pump LTC3400/LTC3400B 600mA (I SW LTC3401 3MHz, Synchronous Step-Up DC/DC Converter ...

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