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Linear Technology Electronic Components Datasheet

LTC3869EUFD Datasheet

2-Phase Synchronous Step-Down DC/DC Controllers

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Features
n Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
n Accurate Multiphase Current Matching
n RSENSE or DCR Current Sensing
n ±0.75% 0.6V Output Voltage Accuracy
n Phase-Lockable Fixed Frequency 250kHz to 780kHz
n High Efficiency: Up to 95%
n Dual N-channel MOSFET Synchronous Drive
n Wide VIN Range: 4V to 38V (40V Max) Operation
n Wide VOUT Range: 0.6V to 12.5V Operation
n Adjustable Soft-Start Current Ramping or Tracking
n Foldback Output Current Limiting
n Output Overvoltage Protection
n Power Good Output Voltage Monitor
n 5V Low Dropout Regulator
n Small 28-Lead QFN and Narrow SSOP Packages
Applications
n Server Systems
n Telecom Systems
n Industrial and Medical Instruments
n High Power Battery-Operated Devices
n DC Power Distribution Systems
LTC3869/LTC3869-2
Dual, 2-Phase
Synchronous Step-Down
DC/DC Controllers
Description
The LTC®3869 is a high performance dual synchronous
step-down switching regulator controller that drives all
N-channel synchronous power MOSFET stages. A constant
frequency current mode architecture allows a phase-
lockable frequency of up to 780kHz. Power loss and noise
due to the ESR of the input capacitors 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. A wide 4V to 38V input supply range
encompasses most battery chemistries. Independent TK/
SS 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, or continuous inductor current mode and allows
the IC to be synchronized to an external clock.
The LTC3869 is available in low profile 4mm × 4mm and
4mm × 5mm QFN packages. The LTC3869-2 is available
in an SSOP-28 package. The LTC3869 is pin-compatible
with the LTC3850.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, OPTI-LOOP, Burst Mode
and PolyPhase are registered trademarks and No RSENSE is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by
U.S. Patents including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6580258,
6498466, 6611131.
Typical Application
High Efficiency Dual 5V/3.3V Step-Down Converter
VIN
7V TO
+
4.7µF
24V
22µF
VIN
INTVCC
TG1
TG2
BOOST1
SW1
BG1
LTC3869
BOOST2
SW2
BG2
PGND
VOUT1
5V
5A
147k
+
47µF
SENSE1+
SENSE2+
SENSE1
SENSE2
VFB1
VFB2
ITH1
FREQ
470pF
20k
ITH2
TK/SS1 SGND TK/SS2
15k
0.1µF
0.1µF
470pF
122k
15k
90.9k +
VOUT2
3.3V
5A
56µF
20k
PINS NOT USED IN
THIS CIRCUIT:
ILIM, MODE/PLLIN,
PGOOD, RUN1, RUN2
3869 TA01
For more information www.linear.com/LTC3869
Efficiency and Power Loss
100
90
80
70
60
50
40
30
20
10
0
0.01
VIN = 12V, VOUT = 3.3V
VIN = 12V, VOUT = 5V
1300
1200
1100
EFFICIENCY
1000
900
800
700
600
POWER LOSS 500
0.1
1
LOAD CURRENT (A)
400
10
3869 TA01b
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Linear Technology Electronic Components Datasheet

LTC3869EUFD Datasheet

2-Phase Synchronous Step-Down DC/DC Controllers

No Preview Available !

LTC3869/LTC3869-2
Absolute Maximum Ratings (Note 1)
Input Supply Voltage: VIN............................ 40V to –0.3V
Top Side Driver Voltages:
BOOST1, BOOST2....................................... 46V to –0.3V
Switch Voltage: SW1, SW2............................ 40V to –5V
INTVCC, RUN1, RUN2, PGOOD, EXTVCC,
BOOST1-SW1, BOOST2-SW2........................ 6V to –0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2Voltages.......................................13V to –0.3V
MODE/PLLIN, ILIM, TK/SS1, TK/SS2,
FREQ Voltages....................................... INTVCC to –0.3V
ITH1, ITH2, VFB1, VFB2 Voltages.............. INTVCC to –0.3V
INTVCC Peak Output Current.................................100mA
Operating Junction Temperature Range
(Note 2)................................................... –40°C to 125°C
Junction Temperature (Note 3).............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
GN Package....................................................... 300°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
SENSE11
22 BOOST1
TK/SS1 2
21 BG1
ITH1 3
VFB1 4
VFB2 5
ITH2 6
TK/SS2 7
SENSE28
SGND
29
20 VIN
19 INTVCC
18 BG2
17 PGND
16 BOOST2
15 TG2
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W,
EXPOSED PAD (PIN 29) IS SGND, MUST BE
SOLDERED TO PCB
TOP VIEW
RUN1 1
SENSE1+ 2
SENSE13
VFB1 4
TK/SS1 5
ITH1 6
SGND 7
ITH2 8
TK/SS2 9
VFB2 10
SENSE211
SENSE2+ 12
RUN2 13
EXTVCC 14
28 FREQ
27 MODE/PLLIN
26 SW1
25 TG1
24 BOOST1
23 BG1
22 VIN
21 INTVCC
20 BG2
19 PGND
18 BOOST2
17 TG2
16 SW2
15 PGOOD
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 80°C/W
TOP VIEW
28 27 26 25 24 23 22
TK/SS1 1
ITH1 2
VFB1 3
VFB2 4
ITH2 5
TK/SS2 6
SENSE27
SGND
29
21 BOOST1
20 BG1
19 VIN
18 INTVCC
17 BG2
16 PGND
15 BOOST2
8 9 10 11 12 13 14
UF PACKAGE
28-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W, θJC = 2.6°C/W
EXPOSED PAD (PIN 29) IS SGND, MUST BE
SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3869EUF#PBF
LTC3869EUF#TRPBF
3869
28-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LTC3869IUF#PBF
LTC3869IUF#TRPBF
3869
28-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LTC3869EUFD#PBF
LTC3869EUFD#TRPBF 3869
28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LTC3869IUFD#PBF
LTC3869IUFD#TRPBF 3869
28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LTC3869IGN-2#PBF
LTC3869IGN-2#TRPBF LTC3869GN-2
28-Lead Narrow Plastic SSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
38692fb
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For more information www.linear.com/LTC3869


Part Number LTC3869EUFD
Description 2-Phase Synchronous Step-Down DC/DC Controllers
Maker Linear Technology
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