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LTC3862HUH-PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3862HUH-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

LTC3862HUH-PBF Datasheet(HTML) 1 Page - Linear Technology

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LTC3862
1
3862fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Multi-Phase Current Mode
Step-Up DC/DC Controller
The LTC
®3862 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 5V
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 5V LDO with undervoltage
lockout protection for the gate drivers, a precision RUN
pin threshold with programmable hysteresis, soft-start
and programmable leading edge blanking and maximum
duty cycle
n Wide VIN Range: 4V to 36V Operation
n 2-Phase Operation Reduces Input and Output
Capacitance
n Fixed Frequency, Peak Current Mode Control
n 5V Gate Drive for Logic-Level 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 5V LDO Regulator
n 24-Lead Narrow SSOP Package
n 5mm
× 5mm QFN with 0.65mm Lead Pitch and
24-Lead Thermally Enhanced TSSOP Packages
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.
VIN
LTC3862
SGND
GATE1
SENSE1+
RUN
84.5k
24.9k
66.5k
10nF
10k
475k
12.4k
68.1k
100pF
0.006Ω
0.006Ω
19.4μH
19.4μH
22μF
50V
220μF
50V
10nF
1nF
10nF
4.7μF
INTVCC
SS
3V8
ITH
FB
VOUT
48V
5A (MAX)
3862 TA01
VIN
5V TO 36V
BLANK
FREQ
SYNC
PLLFLTR
SENSE1
GATE2
SENSE2+
SENSE2
PGND
CLKOUT
SLOPE
DMAX
PHASEMODE
Efficiency vs Output Current
LOAD CURRENT (mA)
100
80
82
84
86
90
94
1000
10000
3862 TA01b
98
88
92
96
VOUT = 48V
VIN = 24V
VIN = 12V
VIN = 5V


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