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Linear Technology Electronic Components Datasheet

LTC3862-2 Datasheet

Multi-Phase Current Mode Step-Up DC/DC Controller

No Preview Available !

Features
n Wide VIN Range: 5.5V to 36V Operation
n 2-Phase Operation Reduces Input and Output
Capacitance
n Fixed Frequency, Peak Current Mode Control
n Internal 10V LDO Regulator
n Lower UVLO Thresholds Allows the Use of
MOSFETs Rated at 6V VGS
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 24-Lead Narrow SSOP Package
n 5mm × 5mm QFN Package with 0.65mm Lead Pitch
n 24-Lead Thermally Enhanced TSSOP Package
Applications
n Automotive, Telecom and Industrial Power Supplies
LTC3862-2
Multi-Phase Current Mode
Step-Up DC/DC Controller
Description
The LTC®3862-2 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. Multiphase
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 under-
voltage lockout protection for the gate drivers, a preci-
sion 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, the Linear logo and PolyPhase are registered trademarks
and No RSENSE and ThinSOT are 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
796k
100k
24.9k
4.7µF
110k
0.1µF
1nF
10nF
12.4k 12.1k
220pF
VIN
RUN GATE1
INTVCC SENSE1+
LTC3862-2
BLANK
FREQ
SYNC
PLLFLTR
SENSE1
GATE2
SENSE2+
SS SENSE2
3V8 PGND
CLKOUT
FB SLOPE
DMAX
ITH PHASEMODE
SGND
16µH 16µH
0.0033Ω
210µF
100V
22µF
50V
VIN
6V TO 32V
VOUT
80V
7A (MAX)
0.0033Ω
38622 TA01a
For more information www.linear.com/LTC3862-2
Efficiency vs Output Current
97 VOUT = 80V
95
93
91
89
87
85
83
81
79
77
10
VIN = 6V
VIN = 9V
VIN = 12V
VIN = 24V
100 1000
LOAD CURRENT (mA)
10000
38622 TA01b
38622fa
1


Linear Technology Electronic Components Datasheet

LTC3862-2 Datasheet

Multi-Phase Current Mode Step-Up DC/DC Controller

No Preview Available !

LTC3862-2
Absolute Maximum Ratings (Notes 1, 2)
Input Supply Voltage (VIN).......................... –0.3V to 40V
INTVCC Voltage ...........................................–0.3V to 11V
INTVCC LDO RMS Output Current ..........................50mA
RUN Voltage................................................. –0.3V to 8V
SYNC Voltage................................................ –0.3V to 6V
SLOPE, PHASEMODE, DMAX,
BLANK Voltage..........................................
SENSE1+, SENSE1, SENSE2+,
–0.3V
to
V3V8
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)
LTC3862-2E..........................................–40°C to 85°C
LTC3862-2I......................................... –40°C to 125°C
LTC3862-2H........................................ –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Reflow Peak Body Temperature ............................ 260°C
Pin Configuration
TOP VIEW
DMAX 1
SLOPE 2
BLANK 3
PHASEMODE 4
FREQ 5
SS 6
ITH 7
FB 8
SGND 9
CLKOUT 10
SYNC 11
PLLFLTR 12
25
PGND
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
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+
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 85°C/W
TOP VIEW
24 23 22 21 20 19
BLANK 1
PHASEMODE 2
FREQ 3
SS 4
ITH 5
FB 6
25
PGND
18 VIN
17 INTVCC
16 GATE1
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
38622fa
2 For more information www.linear.com/LTC3862-2


Part Number LTC3862-2
Description Multi-Phase Current Mode Step-Up DC/DC Controller
Maker Linear Technology
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