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PDF LTC3862 Data sheet ( Hoja de datos )
| Número de pieza | LTC3862 | |
| Descripción | Multi-Phase Current Mode Step-Up DC/DC Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
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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 5V
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 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
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
475k
84.5k
12.4k
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
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
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
3862fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3862
Efficiency vs Output Current
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100
VOUT = 48V
95
90
85
VIN = 35V
80
75 VIN = 24V
70
65
VIN = 12V
60
55
50
10
100 1000
LOAD CURRENT (mA)
10000
3862 G01
Efficiency and Power Loss vs
Input Voltage
96
EFFICIENCY
95
4000
3500
94
3000
93
POWER LOSS
2500
92
91
VOUT = 48V
IOUT = 1A
90
0 10 20 30
INPUT VOLTAGE (V)
2000
1500
40
3862 G02
Load Step
ILOAD
5A/DIV
1A TO 5A
IL1
5A/DIV
IL2
5A/DIV
VOUT
500mV/DIV
VIN = 24V
VOUT = 48V
500μs/DIV
Inductor Current at Light Load
SW1
50V/DIV
SW2
50V/DIV
3862 G03
IL1
2A/DIV
IL2
2A/DIV
VIN = 12V
VOUT = 48V
ILOAD = 100mA
1μs/DIV
3862 G04
Quiescent Current vs Input
Voltage
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
4 8 12 16 20 24 28
INPUT VOLTAGE (V)
32 36
3862 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)
3862 G06
Shutdown Quiescent Current vs
Input Voltage
45
40
35
30
25
20
15
10
5
0
4 8 12 16 20 24 28 32 36
INPUT VOLTAGE (V)
3862 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)
3862 G08
3862fb
5
5 Page 
LTC3862
FUNCTIONAL DIAGRAM
CLKOUT
SYNC
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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
5V
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
3862 FD
3862fb
11
11 Page | ||
| Páginas | Total 40 Páginas | |
| PDF Descargar | [ Datasheet LTC3862.PDF ] | |
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