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PDF LTC3810 Data sheet ( Hoja de datos )
| Número de pieza | LTC3810 | |
| Descripción | 100V Current Mode Synchronous Switching Regulator Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n High Voltage Operation: Up to 100V
n Large 1Ω Gate Drivers
n No Current Sense Resistor Required
n Dual N-Channel MOSFET Synchronous Drive
n Extremely Fast Transient Response
n ±0.5% 0.8V Voltage Reference
n Programmable Output Voltage Tracking/Soft-Start
n Generates 10V Driver Supply from Input Supply
n Synchronizable to External Clock
n Selectable Pulse Skip Mode Operation
n Power Good Output Voltage Monitor
n Adjustable On-Time/Frequency: tON(MIN) < 100ns
n Adjustable Cycle-by-Cycle Current Limit
n Programmable Undervoltage Lockout
n Output Overvoltage Protection
n 28-Pin SSOP Package
APPLICATIONS
n 48V Telecom and Base Station Power Supplies
n Networking Equipment, Servers
n Automotive and Industrial Control Systems
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and No RSENSE is a trademark 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.
LTC3810
100V Current Mode
Synchronous Switching
Regulator Controller
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 amplifier 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 VIN and can also be synchronized to an external clock
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 efficiency.
TYPICAL APPLICATION
High Efficiency High Voltage Step-Down Converter
RON
261k
ION
NDRV
100k
M3
ZXMN10A07F
VIN
+
15V TO 100V
CIN
22μF
CSS
1000pF
47pF
200k
5pF
PGOOD
BOOST
LTC3810
VRNG
TG
MODE/SYNC
SW
SS/TRACK
SHDN
EXTVCC
DRVCC
INTVCC
ITH SENSE+
BG
VFB SENSE–
SGND BGRTN
0.1μF
1μF
M1
Si7456DP
L1
10μH
VOUT
12V/6A
M2
Si7456DP
D1
MBR1100
RFB1
14k
+
COUT
270μF
RFB2
1k
Efficiency vs Load Current
100
VIN = 25V
95
VIN = 50V
VIN = 75V
90
85
80
01 2 34 5 6
LOAD (A)
3810 TA01b
3810 TA01
3810fc
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3810
Load Transient Response
VOUT
100mV/
DIV
IOUT
5A/DIV
VIN = 48V
50μs/DIV
0A TO 5A LOAD STEP
FRONT PAGE CIRCUIT
Short-Circuit/
Foldback Operation
VOUT
5V/DIV
VFB
0.5V/
DIV
IL
5A/DIV
VIN = 48V
200μs/DIV
FRONT PAGE CIRCUIT
Start-Up
INTVCC
5V/DIV
VOUT
5V/DIV
VIN
50V/DIV
INTVCC
IL
5A/DIV
3810 G01
VIN = 48V
500μs/DIV
ILOAD = 1A
MODE/SYNC = 0V
FRONT PAGE CIRCUIT
Short-Circuit/
Fault Timeout Operation
VOUT
10V/DIV
SS/TRACK
4V/DIV
IL
5A/DIV
3810 G02
VIN = 48V
10ms/DIV
RSHORT = 0.1Ω
FRONT PAGE CIRCUIT
3810 G03
Tracking
3810 G04
VOUT
5V/DIV
SS/TRACK
0.5V/DIV
VFB
0.5V/DIV
IL
5A/DIV
VIN = 48V
500μs/DIV
ILOAD = 1A
MODE/SYNC = 0V
FRONT PAGE CIRCUIT
Pulse Skip Mode Operation
SS/TRACK
VFB
VOUT
100mV/
DIV
ITH
0.5V/DIV
IL
2A/DIV
3810 G05
VIN = 48V
20μs/DIV
IOUT = 100mA
MODE/SYNC = INTVCC
FRONT PAGE CIRCUIT
3810 G06
Efficiency vs Input Voltage
100
IOUT = 5A
90
IOUT = 0.5A
80
f = 250kHz
FRONT PAGE CIRCUIT
70
10 20 30 40 50
60
INPUT VOLTAGE (V)
70 80
3810 G07
Efficiency vs Load Current
100
95
VIN = 12V
VIN = 36V
VIN = 60V
90
85
80
75
70
01
VOUT = 5V
Si7850 MOSFETs
MODE/SYNC = INTVCC
f = 250kHz
234567
LOAD CURRENT (A)
3810 G08
Frequency vs Input Voltage
280
270
260 IOUT = 0A
250 IOUT = 5A
240
MODE/SYNC = 0V
FRONT PAGE CIRCUIT
230
10 20 30 40 50
60
INPUT VOLTAGE (V)
70 80
3810 G09
3810fc
5
5 Page 
LTC3810
FUNCTIONAL DIAGRAM
INTVCC
EXTVCC NDRV INTVCC
5V
REG
VIN
RUV1
RUV2
UVIN
14
–
VIN UV
+
0.8V +
MODE/SYNC
F
7–
PLL/LPF
10
PLL-SYNC
0.8V INTVCC
REF
MODE
LOGIC
10V +
–
INUTVVCC
+
12V
6.2V
–
OFF
1.4μA
270μA
–
+
ON
VON
4
RON
VIN
ION
1
100nA
tON
=
VVON
IION
(76pF)
+
ICMP
–
20k
R
SQ
+
IREV
–
TIMEOUT
LOGIC
DRV OFF
FCNT
ON
SWITCH
LOGIC
SHDN
OV
200μA
+
NDRV
15
INTVCC
17
EXTVCC
16
– 10V
+
– 6.7V
DB
BOOST
28
TG
27
SW
26
SENSE+
25
DRVCC
18
BG
19
×
1.4V
VRNG
5
ITH 0.7V
8
ITH’
FOLDBACK
OVERTEMP
SENSE
FB
4V
CC2 RC
2.6V
CC1
FAULT
RUN
EA + SHDN –
BGRTN
20
SENSE–
21
PGOOD
6
+
UV
–
+
OV
–
0.72V
VFB
9
0.88V
SGND
12
1.5V
0.8V
SS/TRACK SHDN
11 13
VIN
M3
+
VIN
+
CIN
CB
M1
L1
VOUT
CVCC
M2
+
COUT
RFB1
RFB2
3810 FD
3810fc
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3810.PDF ] | |
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