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LT3845 Datasheet(PDF) 1 Page - Linear Technology

Part # LT3845
Description  High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3845 Datasheet(HTML) 1 Page - Linear Technology

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LT3845
1
3845fd
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Voltage Synchronous
Current Mode Step-Down
Controller with Adjustable
Operating Frequency
The LT
®3845 is a high voltage, synchronous, current
mode controller used for medium to high power, high
efficiency supplies. It offers a wide 4V to 60V input range
(7.5V minimum start-up voltage). An onboard regulator
simplifies the biasing requirements by providing IC power
directly from VIN.
Burst Mode
® operation maintains high efficiency at light
loads by reducing IC quiescent current to 120μA. Light
load efficiency is also improved with the reverse inductor
current inhibit function which supports discontinuous
operation.
Additional features include adjustable fixed operating
frequency that can be synchronized to an external clock
for noise sensitive applications, gate drivers capable of
driving large N-channel MOSFETs, a precision undervoltage
lockout, 10μA shutdown current, short-circuit protection
and a programmable soft-start.
The LT3845 is available in a 16-lead thermally enhanced
TSSOP package and 16-pin through hole N package.
High Voltage Operation: Up to 60V
Synchronizable Up to 600kHz
Adjustable Constant Frequency: 100kHz to 500kHz
Output Voltages Up to 36V
Adaptive Nonoverlap Circuitry Prevents Switch
Shoot-Through
Reverse Inductor Current Inhibit for Discontinuous
Operation Improves Efficiency with Light Loads
Programmable Soft-Start
120μA No Load Quiescent Current
10μA Shutdown Supply Current
1% Regulation Accuracy
Standard Gate N-Channel Power MOSFETs
Current Limit Unaffected by Duty Cycle
Reverse Overcurrent Protection
16-Lead Thermally Enhanced TSSOP Package,
16-Pin PDIP
12V and 42V Automotive and Heavy Equipment
48V Telecom Power Supplies
Avionics and Industrial Control Systems
Distributed Power Converters
High Voltage Step-Down Regulator 48V to 12V at 75W
Efficiency and Power Loss vs
Load Current
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.. Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
VIN
SHDN
CSS
BURST_EN
VFB
VC
SYNC
fSET
BOOST
TG
SW
VCC
BG
PGND
SENSE+
SENSE
SGND
BAS521
1N4148
3845 TA01a
0.1μF
1500pF
Si7370DP
Si7370DP
B160
15μH
0.01Ω
LT3845
1μF
33μF
×3
VOUT
12V
75W
1M
82.5k
16.2k
VIN
20V TO 55V
2.2μF
100V
49.9k
20k
100pF
2200pF
143k
47μF
63V
LOAD CURENT (A)
65
80
75
70
100
95
90
85
0
3
2
1
7
6
5
4
3845 TA01b
0.1
10
1
VIN = 48V
LOSS


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