POWER LOSS (mW)
LTC3525-3/
LTC3525-3.3/LTC3525-5
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Output Disconnect
Fea T Descrip T
n
Up to 95% Efficiency The LTC 3525-3/LTC3525-3.3/LTC3525-5 are high efficiency
n
Output Disconnect and Inrush Current Limit synchronous step-up DC/DC converters with output discon-
n
Fixed Output Voltages of 3V, 3.3V or 5V nect that can start up with an input as low as 0.85V. They
n
Delivers 65mA at 3V from a 1V Input offer a compact, high efficiency alternative to charge pumps
n
Delivers 60mA at 3.3V from a 1V Input, in single cell or dual cell alkaline or Li-Ion applications. Only
or 140mA at 3.3V from a 1.8V Input three small external components are required. The LTC3525
n
Delivers 175mA at 5V from a 3V Input is offered in fixed output voltages of 3V, 3.3V or 5V.
n
Burst Mode Operation: I = 7A
Q
The device includes a 0.5 N-channel MOSFET switch and
n
Only Three External Components
a 0.8 P-channel synchronous rectifier. Peak switch current
n
V > V Operation
IN OUT
ranges from 150mA to 400mA, depending on load, providing
n
<1A Shutdown Current
enhanced efficiency. Quiescent current is an ultralow 7A,
n
Antiringing Control
maximizing battery life in portable applications.
n
Short-Circuit and Overtemperature Protection
n Other features include <1A shutdown current, anti-
Very Low Profile of 1mm
n ringing control and thermal shutdown. The LTC3525 is
Tiny 6-Lead SC70 Package
available in a tiny 6-Lead SC70 package.
a T
List of LTC3525 Options
n
PART NAME INPUT START-UP OUTPUT V STATUS IN
MP3 Players OUT
VOLTAGE VOLTAGE SHUTDOWN MODE
n
Portable Instruments
LTC3525-3 0.85V 3V Output Disconnect
n
Glucose Meters
LTC3525-3.3 0.85V 3.3V Output Disconnect
n
Digital Cameras
LTC3525-5 0.85V 5V Output Disconnect
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
LTC3525D-3.3 0.85V 3.3V Pass Through Mode
property of their respective owners. Patents pending.
LTC3525L-3 0.7V 3V Output Disconnect
LTC3525-3.3 Efficiency and Power
Typical a T
Loss vs Load Current
L1* 100 100
10H
90
80 10
LTC3525-3.3
EFFICIENCY
V
IN
V SW
IN
70
1V TO 1.6V
V
OUT
3.3V
OFF ON SHDN V 60 1
OUT
60mA POWER LOSS
50
GND GND
1F 10F
40 0.1
V = 3V
IN
30
V = 2.4V
3525 TA01
IN
V = 1.2V
IN
20 0.01
0.01 0.1 1 10 100 1000
*MURATA LQH32CN100K53
LOAD (mA)
LT3525 TA02
3525fc
1
For more information www.linear.com/LTC3525
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3525-3/
LTC3525-3.3/LTC3525-5
a Te Maxi Mu M r a T p in c F T
(Note 1)
TOP VIEW
V , V Voltage ........................................ 0.3V to 6V
IN OUT
SW Voltage ................................................. 0.3V to 6V SHDN 1 6 SW
GND 2 5 GND
SW Voltage < 100ns .................................... 0.3V to 7V
V 3 4 V
IN OUT
SHDN Voltage ............................................. 0.3V to 6V
Operating Junction Temperature Range SC6 PACKAGE
6-LEAD PLASTIC SC70
(Notes 2, 5) ............................................ 40C to 125C
T = 125C
JMAX
Storage Temperature Range .................. 65C to 125C
= 256C/W IN FREE AIR, = 150C/W ON BOARD OVER GROUND PLANE
JA JA
Lead Temperature (Soldering, 10 sec) ...................300C
o r Der i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3525ESC6-3#PBF LTC3525ESC6-3#TRPBF LCDR 6-Lead Plastic SC70 40C to 85C
LTC3525ISC6-3#PBF LTC3525ISC6-3#TRPBF LCDR 6-Lead Plastic SC70 40C to 125C
LTC3525ESC6-3.3#PBF LTC3525ESC6-3.3#TRPBF LBTG 6-Lead Plastic SC70 40C to 85C
LTC3525ISC6-3.3#PBF LTC3525ISC6-3.3#TRPBF LBTG 6-Lead Plastic SC70 40C to 125C
LTC3525ESC6-5#PBF LTC3525ESC6-5#TRPBF LBWT 6-Lead Plastic SC70 40C to 85C
LTC3525ISC6-5#PBF LTC3525ISC6-5#TRPBF LBWT 6-Lead Plastic SC70 40C to 125C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: