lt3800 Linear Technology Corporation, lt3800 Datasheet
lt3800
Manufacturer Part Number
lt3800
Description
High-voltage Synchronous Current Mode Step-down Controller
Manufacturer
Linear Technology Corporation
Datasheet
1.LT3800.pdf
(24 pages)
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FEATURES
TYPICAL APPLICATIO
■
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■
■
■
■
■
■
■
■
■
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APPLICATIO S
20V TO 55V
Wide 4V to 60V Input Voltage Range
Output Voltages up to 36V
Adaptive Nonoverlap Circuitry Prevents Switch
Shoot-Through
Reverse Inductor Current Inhibit for Discontinuous
Operation Improves Efficiency with Light Loads
Output Slew Rate Controlled Soft-Start with
Auto-Reset
100µA No Load Quiescent Current
Low 10µA Current Shutdown
1% Regulation Accuracy
200kHz Operating Frequency
Standard Gate N-Channel Power MOSFETs
Current Limit Unaffected by Duty Cycle
Reverse Overcurrent Protection
16-Lead Thermally Enhanced TSSOP Package
12V and 42V Automotive and Heavy Equipment
48V Telecom Power Supplies
Avionics and Industrial Control Systems
Distributed Power Converters
V
IN
100pF
+
20k
1%
82.5k
12V 75W DC/DC Converter with Reverse Current Inhibit and Input UVLO
56µF
×2
1M
82.5k
1.5nF
680pF
174k
1%
200k
U
V
SHDN
C
BURST_EN
V
V
SENSE
IN
SS
FB
C
LT3800
–
SGND
SENSE
BOOST
PGND
V
SW
TG
BG
CC
+
U
1µF
BAS19
1µF
1N4148
1µF
×3
Si7370DP
Si7850DP
DESCRIPTIO
The LT
synchronous current mode step-down switching regula-
tor controller. The IC drives standard gate N-channel power
MOSFETs and can operate with input voltages from 4V to
60V. An onboard regulator provides IC power directly from
V
quiescent current. MOSFET drivers employ an internal
dynamic bootstrap feature, maximizing gate-source “ON”
voltages during normal operation for improved operating
efficiencies. The LT3800 incorporates Burst Mode
tion, which reduces no load quiescent current to under
100µA. Light load efficiencies are also improved through
a reverse inductor current inhibit, allowing the controller
to support discontinuous operation. Both Burst Mode
operation and the reverse-current inhibit features can be
disabled if desired. The LT3800 incorporates a program-
mable soft-start that directly controls the voltage slew rate
of the converter output for reduced startup surge currents
and overshoot errors. The LT3800 is available in a 16-lead
thermally enhanced TSSOP package.
Burst Mode is a registered trademark 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.
B160
High-Voltage Synchronous
15µH
IN
Current Mode Step-Down
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
10µF
and provides for output-derived power to minimize V
®
0.015Ω
3800 is a 200kHz fixed frequency high voltage
+
3800 TA01a
270µF
V
12V AT 75W
OUT
U
100
95
90
85
80
75
70
0.1
Efficiency and Power Loss
V
IN
= 36V
Controller
LOSS (48V)
I
LOAD
V
1
IN
V
(A)
V
IN
= 48V
IN
= 24V
= 60V
LT3800
3800 TA01b
®
opera-
10
6
5
4
3
2
1
0
3800fb
1
IN
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