LTC3525-3 LINER [Linear Technology], LTC3525-3 Datasheet

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LTC3525-3

Manufacturer Part Number
LTC3525-3
Description
400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect
Manufacturer
LINER [Linear Technology]
Datasheet
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
1V to 1.6V
V
Up to 95% Effi ciency
Output Disconnect and Inrush Current Limit
Fixed Output Voltages of 3V, 3.3V or 5V
Delivers 65mA at 3V from a 1V Input
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
V
<1µA Shutdown Current
Antiringing Control
Short-Circuit and Overtemperature Protection
Very Low Profi le of 1mm
Tiny 6-Pin SC70 Package
MP3 Players
Portable Instruments
Glucose Meters
Digital Cameras
IN
IN
> V
OUT
OFF ON
1µF
Operation
®
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
fi ciency synchronous step-up DC/DC converters with
output disconnect that can start up with an input as low
as 1V. They offer a compact, high effi ciency 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 fi xed output voltages
of 3V, 3.3V or 5V.
The device includes a 0.5Ω N-channel MOSFET switch
and a 0.8Ω P-channel synchronous rectifi er. Peak switch
current ranges from 150mA to 400mA, depending on
load, providing enhanced effi ciency. Quiescent current
is an ultralow 7µA, maximizing battery life in portable
applications.
Other features include <1µA shutdown current, anti-
ringing control and thermal shutdown. The LTC3525 is
available in a tiny 6-pin SC70 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.
LTC3525-3.3/LTC3525-5
®
3525-3/LTC3525-3.3/LTC3525-5 are high ef-
100
90
80
70
60
50
40
30
20
0.01
LTC3525-3.3 Effi ciency and Power
400mA Micropower
0.1
EFFICIENCY
Loss vs Load Current
U
LOAD (mA)
1
POWER LOSS
10
LTC3525-3/
V
V
V
100
IN
IN
IN
LT3525 • TA02
= 3V
= 2.4V
= 1.2V
1000
100
10
1
0.1
0.01
3525fa
1

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LTC3525-3 Summary of contents

Page 1

... All other trademarks are the property of their respective owners. Patents Pending 100 OUT 3. OUT 60mA 50 GND 10µ 3525 TA01 20 LTC3525-3/ 400mA Micropower U LTC3525-3.3 Effi ciency and Power Loss vs Load Current 100 10 EFFICIENCY 1 POWER LOSS 0 2. 1.2V IN 0.01 0.01 0 100 1000 LOAD (mA) LT3525 • ...

Page 2

... 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 specifi ed with wider operating temperature ranges. (LTC3525-3) CONDITIONS (Note 6) ⎯ S ⎯ H ⎯ D ⎯ (Note 4) IN ⎯ ...

Page 3

... Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specifi ed maximum operating junction temperature may impair device reliability. Note 6: Consult LTC Marketing for other output voltage options. LTC3525-3/ = 25°C. A MIN TYP ...

Page 4

... TYPICAL PERFOR A CE CHARACTERISTICS Maximum Output Current (for V to Drop 2.5%) OUT 300 LTC3525-3.3 250 200 LTC3525-3 LTC3525-5 150 100 50 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 V (V) IN 3525 G01 LTC3525-3 Effi ciency and Power Loss vs Load 100 100 EFFICIENCY POWER LOSS 0.01 0.01 0 100 ...

Page 5

... G09 Light Load Burst Frequency vs Load 10µF OUT 22µF OUT 5 0 0.1 1 LOAD (mA) 3525 G12 LTC3525-3.3 Input Current and V at Startup OUT OUT 1V/DIV INPUT CURRENT 100mA/DIV 500µs/DIV LTC3525-3.3/LTC3525-5 LTC3525-5 Load Regulation 2 3.6V IN 2.0 1.5 1 ...

Page 6

... LTC3525-5 Output Voltage Ripple I = OUT 5mA I = OUT 50mA I = OUT 150mA 50µs/DIV 22µF OUT LTC3525-3.3 50mA Load Step Response OUTPUT RIPPLE 50mV/DIV LOAD CURRENT 20mA/DIV 3525 G21 500µs/DIV 22µF OUT 25°C unless otherwise noted. A LTC3525-3 ...

Page 7

... I PK COMPARATOR LOGIC I – VAL + I VALLEY COMPARATOR WAKE INTEGRATOR COMPARATOR ADJUST 5 2 GND GND LTC3525-3/ to GND, close to the IC. A minimum value of when ⎯ S ⎯ H ⎯ D ⎯ <0.4V. IN after the inductor current has dropped WELL SWITCH 4 + – OFFSET ADJUST FB – + ...

Page 8

... LTC3525-3/ 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 effi ciency 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

... Figure 1. Inductor Current Changing as a Function of Load full load using the minimum recommended 10µF output capacitor 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 ...

Page 10

... LTC3525-3/ 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 effi ciency. 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 effi ...

Page 11

... OUT 140mA Li-ion 5 GND 10µF 3525 TA05 U SC6 Package 6-Lead Plastic SC70 (Reference LTC DWG # 05-08-1638) 0.10 – 0.30 0.10 – 0.18 (NOTE 3) 0.80 – 1.00 0.00 – 0.10 REF LTC3525-3/ 6.8µH* LTC3525-3 SHDN V OUT 2 5 GND GND 1µF 3525 TA04 *COILCRAFT LPO3310-682MXD **MURATA GRM219R60J106KE191D Li-Ion to 5V 10µ ...

Page 12

... LTC3525-3/ LTC3525-3.3/LTC3525-5 U TYPICAL APPLICATIO 3.3V RELATED PARTS PART NUMBER DESCRIPTION ® LT 1615/LT1615-1 300mA/80mA (I ), High Effi ciency Step-Up DC/DC Converter SW LTC1751-3.3/ 100mA, 800kHz, Micropower, Regulated Charge Pump LTC1751-5 DC/DC Converters LT1930/LTC1930A 1.2MHz/2MHz, High Effi ciency Step-Up DC/DC Converter SW LTC3200-5 100mA, 2MHz, Regulated 5V Charge Pump ...

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