LTC3862-1
Multi-Phase Current Mode
Step-Up DC/DC Controller
Fea T Descrip T
n
Wide V Range: 8.5V to 36V Operation The LTC 3862-1 is a two phase constant frequency, current
IN
n
2-Phase Operation Reduces Input and Output mode boost and SEPIC controller that drives N-channel
Capacitance power MOSFETs. Two phase operation reduces system
n
Fixed Frequency, Peak Current Mode Control filtering capacitance and inductance requirements.
n
10V Gate Drive for High Voltage MOSFETs
The operating frequency can be set with an external resistor
n
Adjustable Slope Compensation Gain
over a 75kHz to 500kHz range and can be synchronized
n
Adjustable Max Duty Cycle (Up to 96%)
to an external clock using the internal PLL. Multi-phase
n
Adjustable Leading Edge Blanking
operation is possible using the SYNC input, the CLKOUT
n
1% Internal Voltage Reference
output and the PHASEMODE control pin allowing 2-, 3-,
n
Programmable Operating Frequency with One
4-, 6- or 12-phase operation.
External Resistor (75kHz to 500kHz)
n Other features include an internal 10V LDO with under-
Phase-Lockable Fixed Frequency 50kHz to 650kHz
n voltage lockout protection for the gate drivers, a preci-
SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or
sion RUN pin threshold with programmable hysteresis,
12-Phase Operation (PHASEMODE Programmable)
n soft-start and programmable leading edge blanking and
Internal 10V LDO Regulator
n maximum duty cycle.
24-Lead Narrow SSOP Package
n
5mm 5mm QFN Package with 0.65mm Lead Pitch
PART NUMBER INTV V ON V OFF
CC IN IN
n
24-Lead Thermally Enhanced TSSOP Package
LTC3862 5V 3.3V 2.9V
LTC3862-1 10V 7.5V 7.0V
a T
LTC3862-2 10V 4.4V 3.9V
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Automotive, Telecom and Industrial Power Supplies
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6144194, 6498466, 6611131.
Typical a T
V
IN
8.5V TO 36V
22F
150k Efficiency vs Output Current
56H 56H
50V
V
OUT
100
72V V = 72V
OUT
24.9k V
IN
2A (MAX) 98
RUN GATE1
V = 32V
+ 96
IN
INTV SENSE1
CC
110F
94
4.7F 0.020 V = 24V
LTC3862-1
IN
100V
92
BLANK SENSE1
45.3k
90
FREQ
GATE2
SYNC
+ 88
SENSE2
V = 9V
IN
PLLFLTR
86
0.1F
0.020
84
SS
SENSE2
1nF
82
3V8
PGND
CLKOUT
80
FB SLOPE
100 1000 10000
1.5nF
D
MAX
LOAD CURRENT (mA)
38621 TA01b
ITH PHASEMODE
SGND
324k 5.62k 45.3k
100pF
38621 TA01a
38621fa
For more information www.linear.com/LTC3862-1 1
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3862-1
a Te Maxi Mu M r a T (Notes 1, 2)
Input Supply Voltage (V ) ......................... 0.3V to 40V SS, PLLFLTR Voltage ................................ 0.3V to V
IN 3V8
INTV Voltage .......................................... 0.3V to 11V ITH Voltage ............................................... 0.3V to 2.7V
CC
INTV LDO RMS Output Current .........................50mA FB Voltage ................................................. 0.3V to V
CC 3V8
RUN Voltage ................................................ 0.3V to 8V FREQ Voltage ............................................ 0.3V to 1.5V
SYNC Voltage ............................................... 0.3V to 6V Operating Junction Temperature Range (Notes 3, 4)
SLOPE, PHASEMODE, D , LTC3862-1E ......................................... 40C to 85C
MAX
BLANK Voltage .......................................... 0.3V to V LTC3862-1I ........................................ 40C to 125C
3V8
+ +
SENSE1 , SENSE1 , SENSE2 , LTC3862-1H ....................................... 40C to 150C
SENSE2 Voltage ...................................... 0.3V to V Storage Temperature Range ................... 65C to 150C
3V8
Reflow Peak Body Temperature ........................... 260C
p in c F T
TOP VIEW
TOP VIEW
TOP VIEW
D 1 24 3V8
MAX
D 1 24 3V8
MAX
+
SLOPE 2 23 SENSE1
+
SLOPE 2 23 SENSE1
BLANK 3 22 SENSE1 24 23 22 21 20 19
BLANK 3 22 SENSE1
PHASEMODE 4 21 RUN
BLANK 1 18 V
IN
PHASEMODE 4 21 RUN
FREQ 5 20 V
IN PHASEMODE 2 17 INTV
CC
FREQ 5 20 V
IN
SS 6 19 INTV FREQ 3 16 GATE1
CC
SS 6 19 INTV
CC
25 25
SS 4 15 PGND
ITH 7 18 GATE1
ITH 7 18 GATE1
ITH 5 14 GATE2
FB 8 17 PGND
FB 8 17 PGND
FB 6 13 NC
SGND 9 16 GATE2
SGND 9 16 GATE2
CLKOUT 10 15 NC 7 8 9 10 11 12
CLKOUT 10 15 NC
SYNC 11 14 SENSE2
SYNC 11 14 SENSE2
+
PLLFLTR 12 13 SENSE2
+
PLLFLTR 12 13 SENSE2
UH PACKAGE
FE PACKAGE
GN PACKAGE
24-LEAD (5mm 5mm) PLASTIC QFN
24-LEAD PLASTIC TSSOP
24-LEAD NARROW PLASTIC SSOP
T = 150C, = 44C/W
JMAX JA
T = 150C, = 38C/W
JMAX JA
T = 150C, = 85C/W
JMAX JA
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
Der in F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3862EFE-1#PBF LTC3862EFE-1#TRPBF LTC3862FE-1 24-Lead Plastic TSSOP 40C to 85C
LTC3862IFE-1#PBF LTC3862IFE-1#TRPBF LTC3862FE-1 24-Lead Plastic TSSOP 40C to 125C
LTC3862HFE-1#PBF LTC3862HFE-1#TRPBF LTC3862FE-1 24-Lead Plastic TSSOP 40C to 150C
LTC3862EGN-1#PBF LTC3862EGN-1#TRPBF LTC3862GN-1 24-Lead Plastic SSOP 40C to 85C
LTC3862IGN-1#PBF LTC3862IGN-1#TRPBF LTC3862GN-1 24-Lead Plastic SSOP 40C to 125C
LTC3862HGN-1#PBF LTC3862HGN-1#TRPBF LTC3862GN-1 24-Lead Plastic SSOP 40C to 150C
38621fa
2 For more information www.linear.com/LTC3862-1
SGND SLOPE
CLKOUT DMAX
SYNC 3V8
+
PLLFLTR SENSE1
+
SENSE2 SENSE1
SENSE2 RUN
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