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LT3477
3A, DC/DC Converter
with Dual Rail-to-Rail
Current Sense
FEATURES
DESCRIPTION
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Dual 100mV Rail-to-Rail Current Sense Ampli?ers
Wide Input Voltage Range: 2.5V to 25V
3A, 42V Internal Switch
High Ef?ciency Power Conversion: Up to 93%
Drives LEDs in Boost, Buck-Boost or Buck Mode
Frequency Set by External Resistor: 200kHz to 3.5MHz
Programmable Soft-Start
Low V CESAT Switch: 0.3V at 2.5A
Capable of Positive and Negative Output Voltages
(Boost, Inverting, SEPIC, Flyback)
Available in Thermally Enhanced 20-Lead
(4mm × 4mm) QFN and 20-Lead TSSOP Packages
The LT ? 3477 is a current mode, 3A DC/DC step-up con-
verter with dual rail-to-rail current sense ampli?ers and an
internal 3A, 42V switch. It combines a traditional voltage
feedback loop and two unique current feedback loops to
operate as a constant-current, constant-voltage source.
Both current sense voltages are set at 100mV and can be
adjusted independently using the I ADJ1 and I ADJ2 pins. Ef-
?ciency of up to 91% can be achieved in typical applications.
The LT3477 features a programmable soft-start function
to limit inductor current during start-up. Both inputs of
the error ampli?er are available externally allowing posi-
tive and negative output voltages (boost, inverting, SEPIC,
Flyback). The switching frequency is programmable from
High Power LED Driver
DSL Modems
Distributed Power
Input/Output Current Limited Boost, SEPIC,
APPLICATIONS
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200kHz to 3.5MHz through an external resistor.
Available in thermally enhanced 20-pin (4mm × 4mm)
QFN and 20-pin TSSOP packages, the LT3477 provides a
complete solution for both constant-voltage and constant-
current applications.
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Inverting, Flyback Converters
Constant-Voltage, Constant-Current Source
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
330mA LED Driver With Open LED Protection
Ef ?ciency
V IN
10μH
90
5V
3.3μF
I SP1
I SN1
SW
200k
3.3μF
85
V IN
I ADJ1
I ADJ2
FBN
10k
80
75
70
SHDN
SHDN
LT3477
I SP2
0.3Ω
65
V C
V REF
I SN2
R T
60
55
1k
FBP
GND
SS
330mA
50
0
0.1
0.2
0.3
0.4
4.7nF
33nF
22k
I OUT (A)
3477 TA01b
3477 TA01a
3477fc
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