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LTC3862 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3862
Description  Multi-Phase Current Mode Step-Up DC/DC Controller
Download  42 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3862 Datasheet(HTML) 1 Page - Linear Technology

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LTC3862
1
3862fc
For more information www.linear.com/LTC3862
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.
Theoperatingfrequencycanbesetwithanexternalresistor
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.
Otherfeaturesincludeaninternal5VLDOwithundervoltage
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
VIN
LTC3862
SGND
GATE1
SENSE1+
RUN
84.5k
24.9k
66.5k
10nF 10k
475k
12.4k
68.1k
100pF
0.006
0.006
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
PART NUMBER
INTVCC
VIN ON
VIN OFF
LTC3862
5V
3.3V
2.9V
LTC3862-1
10V
7.5V
7.0V
LTC3862-2
10V
4.4V
3.9V
L
, LT, LTC, LTM, Linear Technology and the Linear logo 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.


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