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Linear Technology Electronic Components Datasheet

LTC3862IUH Datasheet

Step-Up DC/DC Controller

No Preview Available !

Features
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
Applications
n Automotive, Telecom and Industrial Power Supplies
LTC3862
Multi-Phase Current Mode
Step-Up DC/DC Controller
Description
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 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.
PART NUMBER
LTC3862
LTC3862-1
LTC3862-2
INTVCC
5V
10V
10V
VIN ON
3.3V
7.5V
4.4V
VIN OFF
2.9V
7.0V
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.
Typical Application
84.5k
24.9k
VIN
RUN
GATE1
INTVCC SENSE1+
4.7µF
LTC3862
66.5k
10nF 10k
10nF
BLANK
FREQ
SYNC
PLLFLTR
SENSE1
GATE2
SENSE2+
1nF
SS
SENSE2
3V8
PGND
CLKOUT
10nF
FB
SLOPE
DMAX
ITH PHASEMODE
475k
12.4k 68.1k
100pF
SGND
19.4µH 19.4µH
220µF
0.006Ω 50V
22µF
50V
VIN
5V TO 36V
VOUT
48V
5A (MAX)
0.006Ω
3862 TA01
For more information www.linear.com/LTC3862
Efficiency vs Output Current
98
VOUT = 48V
96
VIN = 12V
94
92
90
VIN = 24V
88
VIN = 5V
86
84
82
80
100
1000
LOAD CURRENT (mA)
10000
3862 TA01b
3862fc
1


Linear Technology Electronic Components Datasheet

LTC3862IUH Datasheet

Step-Up DC/DC Controller

No Preview Available !

LTC3862
Absolute Maximum Ratings (Notes 1, 2)
Input Supply Voltage (VIN).......................... –0.3V to 40V
INTVCC Voltage ............................................. –0.3V to 6V
INTVCC LDO RMS Output Current ..........................50mA
RUN Voltage................................................. –0.3V to 8V
SYNC Voltage................................................ –0.3V to 6V
SLOPE, PHASEMODE, DMAX,
BLANK Voltage........................................... –0.3V to V3V8
SENSE1+, SENSE1, SENSE2+,
SENSE2Voltage....................................... –0.3V to V3V8
SS, PLLFLTR Voltage................................. –0.3V to V3V8
ITH Voltage................................................ –0.3V to 2.7V
FB Voltage.................................................. –0.3V to V3V8
FREQ Voltage............................................. –0.3V to 1.5V
Operating Junction Temperature Range (Notes 3, 4)
LTC3862E.............................................. –40°C to 85°C
LTC3862I............................................ –40°C to 125°C
LTC3862H........................................... –40°C to 150°C
Storage Temperature Range.................... –65°C to 150°C
Reflow Peak Body Temperature ............................ 260°C
Pin Configuration
DMAX 1
SLOPE 2
BLANK 3
PHASEMODE 4
FREQ 5
SS 6
ITH 7
FB 8
SGND 9
CLKOUT 10
SYNC 11
PLLFLTR 12
TOP VIEW
25
24 3V8
23 SENSE1+
22 SENSE1
21 RUN
20 VIN
19 INTVCC
18 GATE1
17 PGND
16 GATE2
15 NC
14 SENSE2
13 SENSE2+
DMAX 1
SLOPE 2
BLANK 3
PHASEMODE 4
FREQ 5
SS 6
ITH 7
FB 8
SGND 9
CLKOUT 10
SYNC 11
PLLFLTR 12
TOP VIEW
24 3V8
23 SENSE1+
22 SENSE1
21 RUN
20 VIN
19 INTVCC
18 GATE1
17 PGND
16 GATE2
15 NC
14 SENSE2
13 SENSE2+
FE PACKAGE
24-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 38°C/W
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 85°C/W
TOP VIEW
BLANK 1
PHASEMODE 2
FREQ 3
SS 4
ITH 5
FB 6
24 23 22 21 20 19
18 VIN
17 INTVCC
16 GATE1
25
15 PGND
14 GATE2
13 NC
7 8 9 10 11 12
UH PACKAGE
24-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 150°C, θJA = 44°C/W
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3862EFE#PBF
LTC3862EFE#TRPBF
3862FE
24-Lead Plastic TSSOP
–40°C to 85°C
LTC3862IFE#PBF
LTC3862IFE#TRPBF
3862FE
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3862HFE#PBF
LTC3862HFE#TRPBF
3862FE
24-Lead Plastic TSSOP
–40°C to 150°C
LTC3862EGN#PBF
LTC3862EGN#TRPBF
LTC3862GN
24-Lead Plastic SSOP
–40°C to 85°C
LTC3862IGN#PBF
LTC3862IGN#TRPBF
LTC3862GN
24-Lead Plastic SSOP
–40°C to 125°C
LTC3862HGN#PBF
LTC3862HGN#TRPBF
LTC3862GN
24-Lead Plastic SSOP
–40°C to 150°C
LTC3862EUH#PBF
LTC3862IUH#PBF
LTC3862EUH#TRPBF
3862
LTC3862IUH#TRPBF
3862
24-Lead (5mm × 5mm) Plastic QFN
24-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
–40°C to 125°C
LTC3862HUH#PBF
LTC3862HUH#TRPBF
3862
24-Lead (5mm × 5mm) Plastic QFN –40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3862fc
2
For more information www.linear.com/LTC3862


Part Number LTC3862IUH
Description Step-Up DC/DC Controller
Maker Linear Technology
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