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LTC3862HFE-1-PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3862HFE-1-PBF
Description  Multi-Phase Current Mode Step-Up DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3862HFE-1-PBF Datasheet(HTML) 1 Page - Linear Technology

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LTC3862-1
1
38621f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Multi-Phase Current Mode
Step-Up DC/DC Controller
The LTC
®3862-1 is a two phase constant frequency, current
mode boost and SEPIC controller that drives N-channel
power MOSFETs. Two phase operation reduces system
filtering capacitance and inductance requirements. The 10V
gate drive is optimized for most automotive and industrial
grade power MOSFETs.
Adjustable slope compensation gain allows the user to fine-
tune the current loop gain, improving noise immunity.
The operating frequency can be set with an external resistor
over a 75kHz to 500kHz range and can be synchronized
to an external clock using the internal PLL. Multi-phase
operation is possible using the SYNC input, the CLKOUT
output and the PHASEMODE control pin allowing 2-, 3-,
4-, 6- or 12-phase operation.
Other features include an internal 10V LDO with
undervoltage lockout protection for the gate drivers, a
precision RUN pin threshold with programmable hyster-
esis, soft-start and programmable leading edge blanking
and maximum duty cycle. The LTC3862 is a 5V gate drive
version of the LTC3862-1.
n Wide VIN Range: 8.5V to 36V Operation
n 2-Phase Operation Reduces Input and Output
Capacitance
n Fixed Frequency, Peak Current Mode Control
n 10V Gate Drive for High Voltage MOSFETs
n Adjustable Slope Compensation Gain
n Adjustable Max Duty Cycle (Up to 96%)
n Adjustable Leading Edge Blanking
n ±1% Internal Voltage Reference
n Programmable Operating Frequency with One
External Resistor (75kHz to 500kHz)
n Phase-Lockable Fixed Frequency 50kHz to 650kHz
n SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or
12-Phase Operation (PHASEMODE Programmable)
n Internal 10V LDO Regulator
n 24-Lead Narrow SSOP Package
n 5mm × 5mm QFN Package with 0.65mm Lead Pitch
n 24-Lead Thermally Enhanced TSSOP Package
n Automotive, Telecom and Industrial Power Supplies
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 6144194, 6498466, 6611131.
Efficiency vs Output Current
LOAD CURRENT (mA)
38621 TA01b
100
90
92
94
96
98
80
82
84
86
88
100
1000
10000
VIN = 32V
VOUT = 72V
VIN = 24V
VIN = 9V
VIN
LTC3862-1
SGND
GATE1
SENSE1+
RUN
150k
24.9k
45.3k
324k
5.62k
45.3k
100pF
0.020Ω
0.020Ω
56μH
56μH
22μF
50V
110μF
100V
0.1μF
1nF
1.5nF
4.7μF
INTVCC
SS
3V8
ITH
FB
VOUT
72V
2A (MAX)
38621 TA01a
VIN
8.5V TO 36V
BLANK
FREQ
SYNC
PLLFLTR
SENSE1
GATE2
SENSE2+
SENSE2
PGND
CLKOUT
SLOPE
DMAX
PHASEMODE


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