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PDF LTC3810-5 Data sheet ( Hoja de datos )
| Número de pieza | LTC3810-5 | |
| Descripción | 60V Current Mode Synchronous Switching Regulator Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n High Voltage Operation: Up to 60V
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 5.5V 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 5mm × 5mm QFN 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, the Linear logo and No RSENSE 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.
LTC3810-5
60V Current Mode
Synchronous Switching
Regulator Controller
Description
The LTC®3810-5 is a synchronous step-down switching
regulator controller that can directly step-down voltages
from up to 60V, making it ideal for telecom and automo-
tive applications. The LTC3810-5 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 LTC3810-5 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 LTC3810-5 to be turned off, reducing the
supply current to 240µA.
Integrated bias control generates gate drive power from
the input supply during start-up or 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
274k
ION
NDRV
VIN
+ 13V TO 60V
100k 22µF
ZXMN10A07F
1000pF
47pF 200k
5pF
PGOOD
BOOST
VRNG LTC3810-5 TG
MODE/SYNC
SW
SS/TRACK
SHDN
EXTVCC
DRVCC
INTVCC
ITH SENSE+
BG
VFB SENSE–
SGND BGRTN
0.1µF
1µF
Si7450DP
10µH
Si7450DP
MBR1100
14k
+
1k
VOUT
12V/6A
270µF
Efficiency vs Load Current
100
VIN = 24V
95 VIN = 42V
90
85
0
12 34
LOAD CURRENT (A)
56
38105 TA01b
38105 TA01
38105fd
1
1 page  
Typical Performance Characteristics
LTC3810-5
Load Transient Response
VOUT
100mV/DIV
IOUT
5A/DIV
VIN = 48V
50µs/DIV
0A TO 5A LOADSTEP
FRONT PAGE CIRCUIT
Start-Up
INTVCC
5V/DIV
VOUT
5V/DIV
VIN
50V/DIV
IL
5A/DIV
INTVCC
38105 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
38105 G02
VIN = 48V
10ms/DIV
RSHORT = 0.1Ω
FRONT PAGE CIRCUIT
38105 G03
Short-Circuit/
Foldback Operation
VOUT
5V/DIV
VFB
0.5V/DIV
IL
5A/DIV
VIN = 48V
200µs/DIV
FRONT PAGE CIRCUIT
Tracking
Pulse Skip Mode Operation
VOUT
5V/DIV
SS/TRACK
0.5V/DIV
VFB
0.5V/DIV
IL
5A/DIV
38105 G04
VIN = 48V
500µs/DIV
ILOAD = 1A
MODE/SYNC = 0V
FRONT PAGE CIRCUIT
SS/TRACK
VOUT
100mV/DIV
VFB
ITH
0.5V/DIV
IL
2A/DIV
38105 G05
VIN = 48V
20µs/DIV
IOUT = 100mA
MODE/SYNC = INTVCC
FRONT PAGE CIRCUIT
38105 G06
Efficiency vs Input Voltage
100
IOUT = 5A
90
IOUT = 0.5A
80
VOUT = 12V
Si7852 MOSFETs
70 f = 250kHz
10 20 30 40 50 60
INPUT VOLTAGE (V)
70 80
38105 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)
38105 G08
Frequency vs Input Voltage
280
270
260 IOUT = 0A
250 IOUT = 5A
240
MODE/SYNC = 0V
230 FRONT PAGE CIRCUIT
10 20 30 40
50
60
INPUT VOLTAGE (V)
70 80
38105 G09
38105fd
5
5 Page 
LTC3810-5
Functional Diagram
INTVCC
EXTVCC NDRV INTVCC
VIN
RUV1 UVIN
13
RUV2
0.8V
MODE/SYNC
5
PLL/LPF
8
VON
2
+
–
RON ION
VIN 31
VRNG
3
1.4V
0.7V
ITH
6
CC2 RC
CC1
5V
REG
–
VIN UV
+
0.8V
REF
INTVCC
MODE
LOGIC
5.5V +
+
INTVCC
UV
–
9V
4.2V
–
OFF
F
PLL-SYNC
1.4µA
270µA
+
–
ON
+
100nA
tON
=
VVON
IION
(76pF)
+
ICMP
–
20k
R
SQ
+
IREV
–
TIMEOUT
LOGIC
DRV OFF
FCNT
ON
–
SWITCH
LOGIC
SHDN
OV
×
ITH’
FOLDBACK
OVERTEMP
SENSE
FB
2.6V 4V
EA FAULT
0.8V
RUN
+ SHDN –
1.5V
SS/TRACK
9
SHDN
12
+
UV
–
+
OV
–
NDRV
14
INTVCC
16
EXTVCC
15
5.5V
DB
4.7V
BOOST
27
TG
26
SW
25
SENSE+
24
DRVCC
17
BG
18
BGRTN
19
SENSE–
20
PGOOD
4
0.72V
VFB
7
0.88V
SGND
12
VIN
M3
+
VIN
+
CIN
CB
M1
L1
VOUT
CVCC
M2
+
COUT
RFB1
RFB2
38105 FD
38105fd
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3810-5.PDF ] | |
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