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PDF LTC3862-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3862-1 | |
| Descripción | Multi-Phase Current Mode Step-Up DC/DC Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
wwwn.daWtasihdeeet4VuI.NcoRmange: 8.5V to 36V Operation
n 2-Phase Operation Reduces Input and Output
Capacitance
n Fixed Frequency, Peak Current Mode Control
n 10V Gate Drive for High Voltage 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 10V LDO Regulator
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
LTC3862-1
Multi-Phase Current Mode
Step-Up DC/DC Controller
DESCRIPTION
The LTC®3862-1 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 10V
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 10V LDO with
undervoltage lockout protection for the gate drivers, a
precision RUN pin threshold with programmable hyster-
esis, soft-start and programmable leading edge blanking
and maximum duty cycle. The LTC3862 is a 5V gate drive
version of the LTC3862-1.
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.
TYPICAL APPLICATION
150k
24.9k
VIN
RUN GATE1
INTVCC SENSE1+
4.7μF
LTC3862-1
45.3k
0.1μF
BLANK
FREQ
SYNC
PLLFLTR
SENSE1–
GATE2
SENSE2+
1nF SS SENSE2–
3V8 PGND
CLKOUT
1.5nF
FB SLOPE
DMAX
ITH PHASEMODE
324k
5.62k 45.3k
100pF
SGND
56μH 56μH
110μF
0.020Ω 100V
22μF
50V
VIN
8.5V TO 36V
VOUT
72V
2A (MAX)
0.020Ω
38621 TA01a
Efficiency vs Output Current
100
VOUT = 72V
98
96
94
92
VIN = 32V
VIN = 24V
90
88
VIN = 9V
86
84
82
80
100
1000
LOAD CURRENT (mA)
10000
38621 TA01b
38621f
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3862-1
www.datasheet4u.com
Efficiency vs Output Current
100
95 VOUT = 72V
90
85 VIN = 9V
80
75
70 VIN = 32V
65
60
55 VIN = 24V
50
45
40
10
100 1000
LOAD CURRENT (mA)
1000
38621 G01
Efficiency and Power Loss
vs Input Voltage
100
99
VON = 72V
IOUT = 0.5A
98
97
96
95
94 EFFICIENCY
93
92
91 POWER LOSS
90
89
88
0 10 20 30
INPUT VOLTAGE (V)
5000
4500
4000
3500
3000
2500
2000
1500
40
38621 G02
Load Step
ILOAD
1A/DIV
500mA
TO 1A
ILOAD1
2A/DIV
ILOAD2
2A/DIV
VOUT
1V/DIV
VIN = 24V
VOUT = 72V
400μs/DIV
Inductor Current at Light Load
38621 G03
SW1
50V/DIV
SW2
50V/DIV
ILOAD1
1A/DIV
ILOAD2
1A/DIV
VIN = 24V
VOUT = 72V
ILOAD = 100mA
1μs/DIV
38621 G04
Quiescent Current
vs Input Voltage
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
8 12 16 20 24 28
INPUT VOLTAGE (V)
32 36
38621 G05
Quiescent Current vs Temperature
1.90
1.85
1.80
1.75
1.70
1.65
1.60
1.55
1.50
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38621 G06
Shutdown Quiescent Current
vs Input Voltage
50
45
40
35
30
20
15
10
5
0
8 12 16 20 24 28 32 36
INPUT VOLTAGE (V)
38621 G07
Shutdown Quiescent Current
vs Temperature
50
VIN = 12V
40
30
20
10
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38621 G08
38621f
5
5 Page 
LTC3862-1
FUNCTIONAL DIAGRAM
CLKOUT
SYNC
www.datasheet4u.com
PLLFLTR
RP
CP DMAX
PHASEMODE
FREQ
RFREQ
SLOPE
SLOPE
COMPENSATION
BLANK
BLANK
LOGIC
BLOGIC
3V8
SS 5μA
CSS
ITH
OT
UV
SD
RC PSKIP
CC
PSKIP – +
0.275V
SYNC
DETECT
VCO
CLK1
CLK2
10V
LDO
UV UVLO
3.8V
LDO
OT
OVER
TEMP
BIAS
VIN
INTVCC
3V8
CIN
CVCC
C3V8
VIN
L
DMAX
OT
UV
S
R1 Q
SD
R2 BLOGIC
PWM LATCH
LOGIC
OV ITRIP
PSKIP
+
ICMP
–
RLOOP
GATE
PGND
SENSE+
SENSE–
V TO I
SD
OV
+ EA– OV – +
1.223V 1.345V
RUN– +
1.22V
DUPLICATE FOR
SECOND CHANNEL
VFB
4.5μA
SGND
0.5μA RUN
D
+
M COUT
RS
VOUT
R2
R1
38621 FD
38621f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3862-1.PDF ] | |
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