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LT3999 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT3999
Description  Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT3999 Datasheet(HTML) 1 Page - Linear Technology

 
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LT3999
1
3999fa
For more information www.linear.com/LT3999
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Low Noise, 1A, 1MHz
Push-Pull DC/DC Driver
with Duty Cycle Control
The LT®3999 is a monolithic, high voltage, high frequency
DC/DC transformer driver providing isolated power in a
small solution footprint.
The LT3999 has two 1A current limited power switches
that switch out of phase. The duty cycle is programmable
to adjust the output voltage. The switching frequency is
programmed up to 1MHz and can be synchronized to an
external clock for more accurate placement of switcher
harmonics. The input operating range is programmed
with the precision undervoltage and overvoltage lockouts.
The supply current is reduced to less than 1µA during
shutdown. A user-defined RC time constant provides an
adjustable soft-start capability by limiting the inrush cur-
rent at start-up.
The LT3999 is available in a 10-lead MSOP and 3mm ×
3mm DFN package with exposed pad.
12V to 12V, 10W Low Noise Isolated DC/DC Converter
LT3999 Line Regulation with
Duty Cycle Control
APPLICATIONS
n
Wide Input Operating Range: 2.7V to 36V
n
Dual 1A Switches with Programmable Current Limit
n
Programmable Switching Frequency: 50kHz to 1MHz
n
Frequency Synchronization Up to 1MHz
n
∆VIN Compensation Using Duty Cycle Control
n
Low Noise Topology
n
Programmable Input Over and Undervoltage Lockout
n
Cross Conduction Prevention Circuitry
n
Programmable Soft-Start
n
Low Shutdown Current: <1µA
n
10-Lead MSOP and DFN Packages
n
Low Noise Isolated Supplies
n
Medical Instrument and Safety
n
Distributed Power
n
Multiple Output Supplies
n
Positive-to-Negative Supplies
n
Noise Immunity in Data Acquisition, RS232
and RS485
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
VIN
SYNC
UVLO
OVLO/DC
RDC
LT3999
SWA
10µF
16V
15.3µH
VOUT
12V
0.8A
• •
• •
VIN
12V
SWB
GND
49.9k
0.1µF
28k
500kHz
10k
15.8k
10µF
16V
255k
3999 TA01a
RT
ILIM/SS
RBIAS
INPUT VOLTAGE (V)
10
12
14
18
3999 TA01b
10
8
12
14
16
11
13
15
17
16
11
13
9
15
IOUT = 200mA
IOUT = 800mA
IOUT = 400mA


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