LTC3810-5
60V Current Mode
Synchronous Switching
Regulator Controller
Fea T Descrip T
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High Voltage Operation: Up to 60V The LTC 3810-5 is a synchronous step-down switching
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Large 1 Gate Drivers regulator controller that can directly step-down voltages
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No Current Sense Resistor Required from up to 60V, making it ideal for telecom and automo-
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Dual N-Channel MOSFET Synchronous Drive tive applications. The LTC3810-5 uses a constant on-time
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Extremely Fast Transient Response valley current control architecture to deliver very low duty
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0.5% 0.8V Voltage Reference cycles with accurate cycle-by-cycle current limit, without
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Programmable Output Voltage Tracking/Soft-Start requiring a sense resistor.
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Generates 5.5V Driver Supply from Input Supply
A precise internal reference provides 0.5% DC accuracy. A
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Synchronizable to External Clock
high bandwidth (25MHz) error amplifier provides very fast
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Selectable Pulse Skip Mode Operation
line and load transient response. Large 1 gate drivers
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Power Good Output Voltage Monitor
allow the LTC3810-5 to drive multiple MOSFETs for higher
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Adjustable On-Time/Frequency: t < 100ns
ON(MIN)
current applications. The operating frequency is selected
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Adjustable Cycle-by-Cycle Current Limit
by an external resistor and is compensated for variations
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Programmable Undervoltage Lockout
in V and can also be synchronized to an external clock
IN
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Output Overvoltage Protection
for switching-noise sensitive applications. A shutdown
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5mm 5mm QFN Package
pin allows the LTC3810-5 to be turned off, reducing the
supply current to 240A.
a T
Integrated bias control generates gate drive power from
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48V Telecom and Base Station Power Supplies
the input supply during start-up or when an output short-
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Networking Equipment, Servers
circuit occurs, with the addition of a small external SOT23
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Automotive and Industrial Control Systems
MOSFET. When in regulation, power is derived from the
L, LT, LTC, LTM, Linear Technology, the Linear logo and No R are registered trademarks
SENSE
output for higher efficiency.
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 a T
High Efficiency High Voltage Step-Down Converter Efficiency vs Load Current
V 100
IN
13V TO 60V
+
274k 100k
22F
V = 24V
IN
I
ON
NDRV ZXMN10A07F
95
V = 42V
IN
PGOOD BOOST
LTC3810-5
V
RNG
TG Si7450DP
10H
0.1F
V
OUT 90
MODE/SYNC
SW
1000pF
12V/6A
EXTV
CC
SS/TRACK
DRV
CC
14k
SHDN
INTV
CC
+
85
+ MBR1100 270F 0 1 2 3 4 5 6
SENSE
I
TH
47pF LOAD CURRENT (A)
200k
BG Si7450DP
38105 TA01b
V
FB
SENSE
5pF
SGND BGRTN
1F 1k
38105 TA01
38105fd
1
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3810-5
a Te Maxi Mu M r a T p in c F T
(Note 1)
TOP VIEW
Supply Voltages
INTV , DRV ...................................... 0.3V to 14V
CC CC
(DRV BGRTN), (BOOST SW) ........ 0.3V to 14V
CC
32 31 30 29 28 27 26 25
BOOST (Continuous) .............................. 0.3V to 85V
+
NC 1 24 SENSE
BOOST (400ms) .................................. 0.3V to 95V
V 2 23 NC
ON
BGRTN ........................................................ 5V to 0V
V 3 22 NC
RNG
EXTV .................................................. 0.3V to 15V
CC PGOOD 4 21 NC
33
(EXTV INTV ) ..................................12V to 12V
MODE/SYNC 5 20 SENSE
CC CC
I BGRTN
(NDRV INTV ) Voltage .......................... 0.3V to 10V 6 19
TH
CC
+
V 7 18 BG
FB
SW, SENSE Voltage (Continuous) .................1V to 70V
+ PLL/LPF 8 17 DRV
CC
SW, SENSE Voltage (400ms) ........................1V to 80V
9 10 11 12 13 14 15 16
I Voltage (Continuous) ............................ 0.3V to 70V
ON
I Voltage (400ms) ................................... 0.3V to 80V
ON
SS/TRACK Voltage ....................................... 0.3V to 5V
UH PACKAGE
PGOOD Voltage ............................................ 0.3V to 7V
32-LEAD (5mm 5mm) PLASTIC QFN
V , V , MODE/SYNC, SHDN,
RNG ON
T = 125C, = 34C/W
JMAX JA
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
UVIN Voltages ............................................ 0.3V to 14V
PLL/LPF, FB Voltages ................................ 0.3V to 2.7V
TG, BG, INTV , EXTV RMS Currents ................50mA
CC CC
Operating Junction Temperature Range (Notes 2, 3, 7)
LTC3810E-5 ....................................... 40C to 125C
LTC3810I-5 ........................................ 40C to 125C
LTC3810H-5 ....................................... 40C to 150C
Storage Temperature Range .................. 65C to 125C
o r Der i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3810EUH-5#PBF LTC3810EUH-5#TRPBF 38105 40C to 125C
32-Lead (5mm 5mm) Plastic QFN
LTC3810IUH-5#PBF LTC3810IUH-5#TRPBF 38105 40C to 125C
32-Lead (5mm 5mm) Plastic QFN
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3810EUH-5 LTC3810EUH-5#TR 38105 40C to 125C
32-Lead (5mm 5mm) Plastic QFN
LTC3810IUH-5 LTC3810IUH-5#TR 38105 40C to 125C
32-Lead (5mm 5mm) Plastic QFN
LTC3810HUH-5 LTC3810HUH-5#TR 38105 32-Lead (5mm 5mm) Plastic QFN 40C to 150C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: