LINER LTC3525DESC6-3.3 400ma micropower synchronous step-up dc/dc converter with pass through mode Datasheet

LTC3525D-3.3
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Pass Through Mode
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DESCRIPTIO
FEATURES
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The LTC®3525D-3.3 is a high efficiency synchronous stepup DC/DC converter that can start up with an input as low
as 0.85V. It offers 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 LTC3525D features a fixed output voltage
of 3.3V. In shutdown, VOUT is connected to VIN through
the inductor.
VOUT Connected to VIN in Shutdown
Up to 95% Efficiency
0.85V Minimum Input Start-Up Voltage
Fixed Output Voltage of 3.3V
Delivers 60mA at 3.3V from a 1V Input,
or 140mA at 3.3V from a 1.8V Input
Burst Mode® Operation: IQ = 7µA
VIN Range: 0.5V to 4.5V
Only Three External Components
VIN > VOUT Operation
Antiringing Control
Short-Circuit and Overtemperature Protection
Very Low Profile of 1mm
Tiny 6-Pin SC70 Package
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
applications.
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APPLICATIO S
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Other features include anti-ringing control and thermal
shutdown. The LTC3525D is available in a tiny 6-pin SC70
package.
MP3 Players
Portable Instruments
Glucose Meters
Digital Cameras
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Patents Pending.
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TYPICAL APPLICATIO
LTC3525D-3.3 Efficiency and
Power Loss vs Load Current
L1*
10µH
100
100
90
SW
VOUT
3.3V
140mA
PASS THROUGH ON
SHDN
GND
VOUT
GND
10µF
1µF
EFFICIENCY (%)
VIN
1.8V to 3.2V
EFFICIENCY
70
1
60
POWER LOSS
50
0.1
40
3525 TA01
VIN = 3V
VIN = 2.4V
VIN = 1.2V
30
20
0.01
*MURATA LQH32CN100K53
POWER LOSS (mW)
VIN
10
80
LTC3525D-3.3
0.1
1
10
LOAD (mA)
100
0.01
1000
LT3525 • TA02
3525d33f
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LTC3525D-3.3
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ABSOLUTE
AXI U RATI GS
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PACKAGE/ORDER I FOR ATIO
(Note 1)
VIN, VOUT Voltage ........................................ –0.3V to 6V
SW Voltage ................................................. –0.3V to 6V
SW Voltage < 100ns ................................... –0.3V to 7V
⎯S⎯H⎯D⎯N Voltage ............................................. –0.3V to 6V
Operating Temperature Range
(Notes 2, 5).......................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
TOP VIEW
SHDN 1
6 SW
GND 2
5 GND
VIN 3
4 VOUT
SC6 PACKAGE
6-LEAD PLASTIC SC70
TJMAX = 125°C
θJA = 256°C/W IN FREE AIR, θJA = 150°C/W ON BOARD
OVER GROUND PLANE
ORDER PART NUMBER
SC6 PART MARKING
LTC3525DESC6-3.3
LCQZ
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 1.2V, V⎯S⎯H⎯D⎯N = 1.2V, VOUT = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
Input Start-Up Voltage
●
3.20
TYP
MAX
0.85
1
UNITS
V
3.30
3.40
V
15
µA
Output Voltage
(Note 6)
Quiescent Current, VOUT
⎯S⎯H⎯D⎯N = VIN (Note 4)
7
Quiescent Current, VIN
⎯S⎯H⎯D⎯N = VIN (Note 4)
0.5
3
µA
Quiescent Current, VIN - Shutdown
⎯S⎯H⎯D⎯N = 0V, VOUT = VIN = 3.3V
Including Switch Leakage
3
10
µA
NMOS Switch On Resistance
(Note 3)
0.5
Ω
PMOS Switch On Resistance
(Note 3)
0.8
Ω
A
Peak Current Limit
0.4
0.45
⎯S⎯H⎯D⎯N Threshold
0.4
0.6
1
V
0.01
1
µA
⎯S⎯H⎯D⎯N Input Current
V⎯S⎯H⎯D⎯N = VIN or VOUT
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3525DE is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Current Measurements are performed when the LTC3525D is not
switching.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. 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.
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LTC3525D-3.3
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TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Maximum Output Current vs VIN
(for VOUT to Drop 2.5%)
Maximum Startup Load vs VIN
(Resistive Load)
300
No-Load Input Current vs VIN
50
250
45
250
40
200
35
150
IIN (µA)
150
LOAD (mA)
IOUT (mA)
200
100
100
30
25
20
15
10
50
50
5
0
0.5
1.0
1.5
2.0
2.5 3.0
VIN (V)
3.5
4.0
4.5
0.5
1.0
1.5
2.0
VIN (V)
3.0
2.5
3525 G01
100
2.5
90
50
0.1
40
30
0.1
1
10
LOAD (mA)
4.0
1.0
0.5
COUT = 22µF
0
COUT = 10µF
–0.5
–1.0
1.0
0.5
–0.5
–1.5
–2.0
–2.0
100
–2.5
3525 G04
10
20
30 40 50
LOAD (mA)
60
70
80
COUT = 10µF
–1.0
–1.5
0
COUT = 22µF
0
VIN = 3V
VIN = 2.4V
VIN = 1.2V
0.01
1000
–2.5
0
20
40
60
80 100 120 140 160 180
LOAD (mA)
3525 G06
35
0.3
30
0.2
25
20
COUT = 10µF
15
Start-Up Delay Coming Out of
Shutdown
120
100
SWITCHING DELAY (µs)
0.4
CHANGE IN VOUT (%)
BURST FREQUENCY (kHz)
40
0.1
0
–0.1
–0.2
10
COUT = 22µF
0.1
1
LOAD (mA)
10
3525 G12
80
60
40
20
–0.3
5
0
3525 G07
VOUT Variation vs Temperature
(Normalized to 25°C)
Light Load Burst Frequency
vs Load
4.5
1.5
CHANGE IN VOUT (%)
POWER LOSS
CHANGE IN VOUT (%)
EFFICIENCY (%)
1
60
POWER LOSS (mW)
70
3.5
VIN = 2.4V
2.0
1.5
10
EFFICIENCY
2.5 3.0
VIN (V)
Load Regulation
2.5
VIN = 1.2V
2.0
80
2.0
3525 G03
Load Regulation
100
1.5
3525 G02
Efficiency and Power Loss vs
Load
20
0.01
0
1.0
0
–0.4
–40–30–20–10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
3525 G13
0
1.0
1.5
2.0
2.5 3.0
VIN (V)
3.5
4.0
4.5
3525 G14
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LTC3525D-3.3
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TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Output Voltage Ripple
Output Voltage Ripple
IOUT =
5mA
IOUT =
5mA
IOUT =
40mA
IOUT =
40mA
50mV/DIV
IOUT =
80mA
50mV/DIV
IOUT =
80mA
VIN = 1.2V
COUT = 10µF
50µs/DIV
3525 G16
VIN = 1.2V
COUT = 22µF
50µs/DIV
3525 G17
50mA Load Step Response
Output Voltage Ripple
IOUT =
5mA
IOUT =
100mA
OUTPUT
RIPPLE
50mV/DIV
50mV/DIV
LOAD
CURRENT
20mA/DIV
IOUT =
190mA
VIN = 2.4V
COUT = 22µF
50µs/DIV
3525 G18
VIN = 1.2V
COUT = 22µF
500µs/DIV
3525 G21
100mA Load Step Response
OUTPUT
RIPPLE
50mV/DIV
LOAD
CURRENT
50mA/DIV
VIN = 2.4V
COUT = 22µF
500µs/DIV
3525 G22
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LTC3525D-3.3
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PI FU CTIO S
⎯S⎯H⎯D⎯N (Pin 1): Logic Controlled Shutdown Input. Connect
to a voltage >1V to enable the LTC3525D. Connect to a
voltage <0.4V to disable the LTC3525D and connect VIN
to VOUT through the inductor.
VOUT (Pin 4): Output Voltage Sense and the Output of the
Synchronous Rectifier. Connect the output filter capacitor
from VOUT to GND, close to the IC. A minimum value of
10µF ceramic is recommended. Use 22µF for reduced
output ripple. The pass-through mode feature connects
VOUT to VIN through the inductor when ⎯S⎯H⎯D⎯N is <0.4V.
GND (Pins 2, 5): Ground.
VIN (Pin 3): Input Voltage. The LTC3525D is powered from
VIN until VOUT exceeds VIN. Once VOUT is greater than (VIN
+ 0.2V typical), it is powered from VOUT. Place a ceramic
bypass capacitor from VIN to GND. A minimum value of
1µF is recommended.
SW (Pin 6): Switch Pin. Connect an inductor from this
pin to VIN. An internal antiringing resistor is connected
across SW and VIN after the inductor current has dropped
to zero to minimize EMI.
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BLOCK DIAGRA
SW
VIN
6
3
VOUT
VSEL
VBEST
WELL
SWITCH
VB
4 VOUT
SHUTDOWN
SHUTDOWN GATE DRIVERS
AND
ANTI-CROSS
CONDUCTION
+
–
OFFSET
VREF
UVLO
ADJUST
VREF
IPK
UVLO
–
+
+
IPK
COMPARATOR
STARTUP
–
ADJUST
LOGIC
IVAL
+
SHUTDOWN
IVALLEY
COMPARATOR
TSD
–
WAKE
+
THERMAL
SHUTDOWN
OFFSET
–
SHDN 1
INTEGRATOR
FB
VREF
SLEEP
COMPARATOR
ADJUST
5
2
GND
GND
3525 BD
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LTC3525D-3.3
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OPERATIO
The LTC3525D 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.
It is designed to start-up from a single alkaline or nickel
cell, with input voltages as low as 0.85V, or from two or
three cells (or a Li-ion battery), with voltages as high as
4.5V. Once started, VIN can be as low as 0.5V (depending on load current) and maintain regulation. The output
voltage is preset internally to 3.3V. Peak switch current is
400mA minimum, providing regulation with load currents
up to 150mA, depending on input voltage.
After the ⎯S⎯H⎯D⎯N pin rises, there is a short delay before
switching starts. The delay is 20µs to 120µs, depending
on input voltage (see Typical Performance Characteristics
curve).
Synchronous rectification provides high efficiency operation while eliminating the need for an external Schottky
diode.
A start-up oscillator allows the LTC3525D to start with input
voltages as low as 1V. It remains in start-up mode until
two conditions are met. VOUT must exceed VIN by at least
0.2V typical and either VIN or VOUT must be greater than
1.8V typical.
The LTC3525D can maintain regulation with an input
voltage equal to or greater than VOUT. Note, however, that
the synchronous rectifier is not enabled in this mode,
resulting in lower efficiency and reduced output current
capability.
The operating quiescent current is only 7µA typical, allowing the converter to maintain high efficiency at extremely
light loads.
Shutdown
The LTC3525D is shut down by pulling ⎯S⎯H⎯D⎯N below 0.4V,
and made active by raising it above 1V. Note that ⎯S⎯H⎯D⎯N can
be driven as high as 6V, however, if it is more than 0.9V
above the higher of VIN or VOUT, the ⎯S⎯H⎯D⎯N input current
will increase from zero to 1.5µA.
Pass-Through Mode
When the LTC3525D is in shutdown, the internal P channel
MOSFET switch is turned on. This allows VIN to be connected to VOUT through the inductor in shutdown, creating
a pass-through mode.
Start-up
During startup, the synchronous rectifier is not enabled,
and the internal P-channel synchronous rectifier acts as
a follower, causing the peak voltage on SW to reach (VIN
+ 1V) typical. This limits inrush current by maintaining
control of the inductor current when VOUT is less than VIN.
To reduce power dissipation in the P-channel synchronous
rectifier when the output is shorted, a foldback feature is
incorporated that reduces the peak inductor current when
VIN is more than 1.7V greater than VOUT.
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LTC3525D-3.3
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OPERATIO
INDUCTOR
CURRENT
100mA/DIV
LOAD
CURRENT
50mA/DIV
10µs/DIV
3525 F01
Figure 1. Inductor Current Changing as a Function of Load
Normal Operation
Power Adjust Feature
Once VOUT has increased more than 0.2V typical above
VIN, and either voltage is above 1.8V, normal operation
begins, with synchronous rectification enabled. In this
mode, the internal N-channel MOSFET connected between SW and GND stays on until the inductor current
reaches a maximum peak value, after which it is turned
off and the P-channel synchronous rectifier is turned
on. It stays on, delivering current to the output, until the
inductor current has dropped below a minimum value at
which point it turns off and the cycle repeats. When the
output voltage reaches its regulated value both switches
are turned off and the LTC3525D goes to sleep, during
which time the output capacitor supplies current to the
load. Once the output voltage drops approximately 9mV
below the regulation value the IC leaves sleep mode and
switching is resumed.
The LTC3525D incorporates a feature that maximizes
efficiency at light load while providing increased power
capability at heavy load by adjusting the peak and valley
of the inductor current as a function of load. Lowering the
peak inductor current to 150mA at light load optimizes
efficiency by reducing conduction losses in the internal
MOSFET switches. As the load increases, the peak inductor
current is automatically increased to a maximum of 400mA.
At intermediate loads, the peak inductor current may vary
from 150mA to 400mA. Figure 1 shows an example of
how the inductor current changes as the load increases.
Please note that output capacitor values greater than 47µF
will result in higher peak currents than necessary at light
load. This will lower the light load efficiency.
The LTC3525D has been designed for low output voltage
ripple. The output voltage ripple is typically only 20mV
peak-to-peak at light load and 60mV peak-to-peak at
full load using the minimum recommended 10µF output
capacitor. An anti-ring circuit damps any oscillation at the
switch node when the inductor current falls to zero.
The valley of the inductor current is automatically adjusted
as well, to maintain a relatively constant inductor ripple
current. This keeps the switching frequency relatively
constant.
3525d33f
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LTC3525D-3.3
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OPERATIO
The maximum average load current that can be supported
is given by:
IO(MAX) =
0.3 • VIN • η
Amps
VO
Where η is the efficiency (see Typical Performance
Characteristics).
The “burst” frequency (how often the LTC3525D delivers
a burst of current pulses to the load) is determined by
the internal hysteresis (output voltage ripple), the load
current and the amount of output capacitance. All Burst
Mode operation or hysteretic converters will enter the
audible frequency range when the load is light enough.
However, due to the low peak inductor current at light load,
circuits using the LTC3525D do not typically generate any
audible noise.
Component Selection
Inductor values between 4.7µH and 15µH are recommended. 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.
Inductors with lower DC resistance will improve efficiency.
Note that the inductor value does not have a significant
effect on ripple current, so while lower values will increase
the operating frequency, they do not reduce output voltage ripple.
Some recommended inductor examples are Murata
LQH32C, Coilcraft LPO4812, LPO3310, DO3314, DS1608
and MSS4020, Sumida CDRH2D14 and Taiyo Yuden
NR3015T.
A ceramic input bypass capacitor should be located as
close as possible to the VIN and GND pins of the IC. A
minimum value of 1µF is recommended. If the battery is
more than a few inches away, a bulk tantalum decoupling
cap of at least 10µF is recommended on VIN.
The output capacitor should also be a ceramic, located close
to the VOUT and GND pins. A minimum value of 10µF is
recommended. Increasing the value of the output capacitor
to 22µF will result in lower output ripple. Higher capacitor
values will only offer a small reduction in output ripple,
while reducing light load efficiency by causing the peak
inductor current to increase above its minimum value of
150mA. The input and output capacitors should be X5R
or X7R types, not Y5V.
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LTC3525D-3.3
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OPERATIO
Table 1. Inductor Vendor Information
SUPPLIER
PHONE
FAX
WEBSITE
Murata
USA: (814) 237-1431
USA: (814) 238-0490
www.murata.com
Coilcraft
(847) 639-6400
(847) 639-1469
www.coilcraft.com
Sumida
USA: (847) 956-0666
USA: (847) 956-0702
www.sumida.com
Taiyo Yuden
(408) 573-4150
(408) 573-4159
www.t-yuden.com
Table 2. Capacitor Vendor Information
SUPPLIER
PHONE
FAX
WEBSITE
Murata
USA: (814) 237-1431
USA: (814) 238-0490
www.murata.com
Taiyo Yuden
(408) 573-4150
(408) 573-4159
www.t-yuden.com
TDK
(847) 803-6100
(847) 803-6296
www.component.tdk.com
AVX
(803) 448-9411
(803) 448-1943
www.avxcorp.com
SHDN
SHDN
SW
LTC3525D-3.3
VIN
GND
GND
VIN
VOUT
VOUT
3525 F02
Figure 2. Recommended Component Placement
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LTC3525D-3.3
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TYPICAL APPLICATIO
Single Alkaline or NiMH to 3.3V Converter with 1mm Profile
6.8µH*
1V to 1.6V
3
1
PASS THROUGH ON
2
LTC3525D-3.3
6
SW
VIN
SHDN
VOUT
GND
GND
VOUT
3.3V
60mA
4
5
10µF**
6.3V
1µF
3525 TA04
*COILCRAFT LPO3310-682MXD
**MURATA GRM219R60J106KE191D
2-Alkaline or NiMH to 3.3V
10µH*
1.8V to 3.2V
3
1
PASS THROUGH ON
2
LTC3525D-3.3
VIN
SW
SHDN
VOUT
GND
GND
6
VOUT
3.3V
140mA
4
5
1µF
10µF
3525 TA05
*MURATA LQH32CN1002K53
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LTC3525D-3.3
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PACKAGE DESCRIPTIO
SC6 Package
6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638 Rev B)
0.47
MAX
0.65
REF
1.80 – 2.20
(NOTE 4)
1.00 REF
INDEX AREA
(NOTE 6)
1.80 – 2.40 1.15 – 1.35
(NOTE 4)
2.8 BSC 1.8 REF
PIN 1
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.10 – 0.40
0.65 BSC
0.15 – 0.30
6 PLCS (NOTE 3)
0.80 – 1.00
0.00 – 0.10
REF
1.00 MAX
GAUGE PLANE
0.15 BSC
0.26 – 0.46
0.10 – 0.18
(NOTE 3)
SC6 SC70 1205 REV B
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE INDEX AREA
7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
8. JEDEC PACKAGE REFERENCE IS MO-203 VARIATION AB
3525d33f
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LTC3525D-3.3
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IQ =10µA, ISD <1µA, ThinSOT Package
LT3464
85mA (ISW), High Efficiency Step-Up DC/DC Converter
with Integrated Schottky and PNP Disconnect
VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25µA,
ISD <1µA, ThinSOT Package
LT3427
500mA (ISW), 1.2MHz, Step-Up DC/DC Converter with Output
Disconnect
VIN: 1.8V to 5V, VOUT(MAX) = 5V, ISD <1µA,
2mm × 2mm DFN Package
®
LTC3525-3/LTC3525-3.3/ 400mA Synchronous Step-Up DC/DC Converter with Output
LTC3525-5
Disconnect
VIN: 0.5V to 4.5V, VOUT(MAX) = 5V, IQ = 7µA, ISD <1µA,
SC70 Package
LTC3526/LTC3526B
VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 9µA, ISD <1µA,
2mm × 2mm DFN-6 Package
500mA. 1MHz, Synchronous Step-Up DC/DC Converter
with Output Disconnect
ThinSOT is a trademark of Linear Technology Corporation.
3525d33f
12 Linear Technology Corporation
LT/LWI 1006 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2006
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