ltc3810 Linear Technology Corporation, ltc3810 Datasheet
ltc3810
Manufacturer Part Number
ltc3810
Description
100v Current Mode Synchronous Switching Regulator Controller
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC3810.pdf
(36 pages)
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FEATURES
APPLICATIONS
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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 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611.
TYPICAL APPLICATION
High Voltage Operation: Up to 100V
Large 1Ω Gate Drivers
No Current Sense Resistor Required
Dual N-Channel MOSFET Synchronous Drive
Extremely Fast Transient Response
±0.5% 0.8V Voltage Reference
Programmable Output Voltage Tracking/Soft-Start
Generates 10V Driver Supply from Input Supply
Synchronizable to External Clock
Selectable Pulse Skip Mode Operation
Power Good Output Voltage Monitor
Adjustable On-Time/Frequency: t
Adjustable Cycle-by-Cycle Current Limit
Programmable Undervoltage Lockout
Output Overvoltage Protection
28-Pin SSOP Package
48V Telecom and Base Station Power Supplies
Networking Equipment, Servers
Automotive and Industrial Control Systems
1000pF
47pF
C
5pF
SS
200k
High Effi ciency High Voltage Step-Down Converter
PGOOD
V
MODE/SYNC
SS/TRACK
SHDN
I
V
TH
RNG
FB
I
ON
SGND
R
261k
ON
LTC3810
BGRTN
EXTV
SENSE
SENSE
BOOST
INTV
DRV
NDRV
TG
SW
BG
CC
CC
CC
+
–
100k
0.1μF
ON(MIN)
M3
ZXMN-
10A07F
1μF
M2
Si7456DP
M1
Si7456DP
< 100ns
+
D1
MBR1100
C
22μF
IN
V
15V TO 100V
L1
10μH
IN
R
14k
R
1k
FB2
FB1
3810 TA01
DESCRIPTION
The LTC3810 is a synchronous step-down switching
regulator controller that can directly step-down voltages
from up to 100V, making it ideal for telecom and automo-
tive applications. The LTC3810 uses a constant on-time
valley current control architecture to deliver very low duty
cycles with accurate cycle-by-cycle current limit, without
requiring a sense resistor.
A precise internal reference provides 0.5% DC accuracy. A
high bandwidth (25MHz) error amplifi er provides very fast
line and load transient response. Large 1Ω gate drivers
allow the LTC3810 to drive multiple MOSFETs for higher
current applications. The operating frequency is selected
by an external resistor and is compensated for variations
in V
for switching-noise sensitive applications. A shutdown pin
allows the LTC3810 to be turned off, reducing the supply
current to 240μA.
Integrated bias control generates gate drive power from the
input supply during start-up and when an output short-
circuit occurs, with the addition of a small external SOT23
MOSFET. When in regulation, power is derived from the
output for higher effi ciency.
+
IN
V
12V/6A
C
270μF
OUT
OUT
and can also be synchronized to an external clock
Synchronous Switching
Regulator Controller
100V Current Mode
100
95
85
80
90
0
Effi ciency vs Load Current
V
IN
= 25V
1
2
LOAD (A)
V
3
IN
= 50V
V
IN
4
LTC3810
= 75V
5
3810 TA01b
6
3810fa
1
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