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LTC3865 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3865
Description  Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3865 Datasheet(HTML) 1 Page - Linear Technology

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LTC3865/LTC3865-1
1
3865fb
TYPICAL APPLICATION
DESCRIPTION
Dual, 2-Phase Synchronous
DC/DC Controller with
Pin Selectable Outputs
The LTC
®3865/LTC3865-1 are high performance dual
synchronous step-down DC/DC switching regulator
controllers that drive all N-channel synchronous power
MOSFET stages. A constant frequency current mode
architecture allows a phase-lockable frequency of up to
770kHz. Power loss and noise are minimized by operating
the two controller output stages out of phase.
OPTI-LOOP
® compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. Independent track/soft-start pins for
each controller ramp the output voltage during start-up.
Current foldback limits MOSFET heat dissipation during
short-circuit conditions. The MODE/PLLIN pin selects
among Burst Mode® operation, pulse-skipping mode,
and continuous inductor current mode. The output volt-
ages can be precisely programmed by pin strapping or
external resistors.
The LTC3865/LTC3865-1 are available in low profile (5mm
× 5mm) 32-pin QFN and 38-Lead thermally enhanced
TSSOP packages.
FEATURES
APPLICATIONS
n Dual, 180° Phased Controllers
n 2-Pin VID Output Voltage Programming from 0.6V
to 5V
n High Efficiency: Up to 95%
n RSENSE or DCR Current Sensing
n Phase-Lockable Fixed Frequency 250kHz to 770kHz
n Adjustable Current Limit
n Dual N-Channel MOSFET Synchronous Drive
n Wide VIN Range: 4.5V to 38V Operation
n Adjustable Soft-Start Current Ramping or Tracking
n Output OV Protection With Reverse Current Limit
n Power Good Output Voltage Monitor
n 32-Pin 5mm
× 5mm QFN and 38-Lead TSSOP
Packages
n DC Power Distribution Systems
High Efficiency 1.5V/15A, 1.2V/15A Step-Down Converter
0.1μF
0.47μH
1000pF
1000pF
1000pF
22μF
50V
10k
VOUT1
1.5V
15A
0.1μF
0.47μH
1000pF
100μF
15k
162k
VOUT2
1.2V
15A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
FREQ
SENSE1+
SENSE2+
SENSE1
SENSE2
VOSENSE1
VOSENSE2
ITH1
ITH2
VIN
INTVCC
TK/SS1
TK/SS2
VIN
4.5V TO 24V
3865 TA01a
0.1μF
100pF
0.1μF
LTC3865
VID11
VID12
VID21
VID22
4.7μF
100μF
COUT2,3
100pF
100Ω
100Ω
100Ω
100Ω
2.2Ω
1μF
2mΩ
2mΩ
+
COUT5,6
+
+
LOAD CURRENT (A)
30
90
100
20
10
80
50
70
60
40
0.01
1
10
100
3865 TA01b
0
0.1
10
1
0.01
0.1
VIN = 12V
VOUT = 1.5V
EFFICIENCY
POWER LOSS
Efficiency and Power Loss
vs Load Current
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, μModule, Linear Technology and the Linear logo
are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners. U.S. Patents, including 5481178,
5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.


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