LTC3529 Linear Dimensions Semiconductor, LTC3529 Datasheet
LTC3529
Manufacturer Part Number
LTC3529
Description
1.5MHz Step-Up dc
Manufacturer
Linear Dimensions Semiconductor
Datasheet
1.LTC3529.pdf
(12 pages)
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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
Compact Solution for 5V USB On-The-Go
V
5V at 500mA from Single Li-Ion Cell
Automatic Fault Detection
High Effi ciency: Up to 95%
V
Fixed 5V Output
Short-Circuit Protection
1.5MHz Low Noise, Fixed Frequency PWM
Inrush Current Limiting and Internal Soft-Start
Output Disconnect
<1μA Quiescent Current in Shutdown
V
8-Lead, 2mm × 3mm DFN Package
Personal Media Players
Digital Video Cameras
Digital Multimedia Broadcast Tuners
Digital Cameras
Smart Phones
2.5V
4.2V
BUS
IN
IN
TO
Range: 1.8V to 5.25V
> V
+
Power
OUT
Li-Ion
Li-Ion Battery to 5V Synchronous Boost Converter
AUTO-RESTART
Operation
3.3μF
OFF
OFF
370Ω
ON
ON
V
FAULT SNSGND
RST
SHDN
IN
LTC3529
4.7μH
PGND
3529 TA01a
V
OUT
SW
C
10μF
OUT
V
5V
500mA
OUT
DESCRIPTION
The LTC
step-up DC/DC converter optimized for USB On-The-Go
(OTG) hosting applications. This compact USB OTG 5V
V
internal compensation and a tiny 2mm × 3mm DFN pack-
age. The LTC3529 can operate from input voltages as low
as 1.8V.
USB OTG-specifi c features include a fault fl ag with 22ms
deglitching to indicate when the bus is overloaded, output
disconnect and short-circuit protection. Following a fault,
the LTC3529 can be programmed to either latchoff or
restart after a time-out duration.
Additional features include a <1μA shutdown mode,
soft-start, inrush current limiting and thermal overload
protection. Anti-ring circuitry reduces EMI during low
power operation. The LTC3529 is offered in an 8-lead
2mm × 3mm × 0.75mm DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
6404251, 6166527.
BUS
converter features a 1.5MHz switching frequency,
®
3529 is a 5V output, synchronous, fi xed frequency
1.5A, 1.5MHz Step-Up
DC/DC Converter in
100
90
80
70
60
50
40
30
20
10
0
1
V
INDUCTOR = 4.7μH,
COOPER BUSSMANN SD25-4R7
IN
2mm × 3mm DFN
= 3.6V
Effi ciency vs Load Current
EFFICIENCY
LOAD CURRENT (mA)
10
POWER LOSS
100
LTC3529
3529 TA01b
1000
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3529fa
1
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