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Linear Technology Electronic Components Datasheet

LTC3863 Datasheet

DC/DC Controller

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LTC3863
60V Low IQ Inverting
DC/DC Controller
FEATURES
n Wide Operating VIN Range: 3.5V to 60V
n Wide Negative VOUT Range: –0.4V to Beyond –150V
n Low Operating IQ = 70µA
n Strong High Voltage MOSFET Gate Driver
n Constant Frequency Current Mode Architecture
n Verified FMEA for Adjacent Pin Open/Short
n Selectable High Efficiency Burst Mode® Operation or
Pulse-Skipping Mode at Light Loads
n Programmable Fixed Frequency: 50kHz to 850kHz
n Phase-Lockable Frequency: 75kHz to 750kHz
n Accurate Current Limit
n Programmable Soft-Start or Voltage Tracking
n Internal Soft-Start Guarantees Smooth Start-Up
n Low Shutdown IQ = 7µA
n Available in Small 12-Lead Thermally Enhanced
MSOP and DFN Packages
APPLICATIONS
n Industrial and Automotive Power Supplies
n Telecom Power Supplies
n Distributed Power Systems
DESCRIPTION
The LTC®3863 is a robust, inverting DC/DC PMOS control-
ler optimized for automotive and industrial applications. It
drives a P-channel power MOSFET to generate a negative
output and requires just a single inductor to complete the
circuit. Output voltages from –0.4V to –150V are typically
achievable with higher voltages possible, only limited by
external components.
The LTC3863 offers excellent light load efficiency, draw-
ing only 70μA quiescent current in a user programmable
Burst Mode operation. Its peak current mode, constant
frequency PWM architecture provides for good control of
switching frequency and output current limit. The switch-
ing frequency can be programmed from 50kHz to 850kHz
with an external resistor and can be synchronized to an
external clock from 75kHz to 750kHz.
The LTC3863 offers programmable soft-start or output
tracking. Safety features include overvoltage, overcurrent
and short-circuit protection including frequency foldback.
The LTC3863 is available in thermally enhanced 12-lead
MSOP and 3mm × 4mm DFN packages.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. patents, including 5731694.
TYPICAL APPLICATION
4.5V to 16V Input, –5V/1.7A Output, 350kHz Inverting Converter
350kHz
27nF 14.7k
61.9k
0.47µF
RUN CAP
VIN
PLLIN/MODE
SS SENSE
GATE
ITH LTC3863
FREQ
SGND
PGND
VFBN
VFB
10µF +
25V
×2
16mΩ
VIN
100µF 4.5V TO 16V
20V
Si7129
10µHB540C 511k
33µF
×2
68pF
80.6k
3863 TA01a
VOUT
150µF
16V
–5V
1.7A
×2
Document Feedback
For more information www.analog.com
Efficiency
90 VIN = 12V
80 VOUT = –5V
9
8
70
60 EFFICIENCY
7
6
50 5
40 PULSE-SKIPPING MODE 4
30 Burst Mode OPERATION 3
20 2
10
POWER LOSS
1
0
0.002
0.02 0.2
LOAD CURRENT (A)
0
2
3863 TA01b
Rev. B
1


Linear Technology Electronic Components Datasheet

LTC3863 Datasheet

DC/DC Controller

No Preview Available !

LTC3863
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN).......................... –0.3V to 65V
VIN-VSENSE Voltage....................................... –0.3V to 6V
VIN-VCAP Voltage......................................... –0.3V to 10V
RUN Voltage............................................... –0.3V to 65V
VFBN, PLLIN/MODE Voltages........................ –0.3V to 6V
SS, ITH, FREQ, VFB Voltages......................... –0.3V to 5V
Operating Junction Temperature Range (Notes 2, 3, 4)
LTC3863E,I ........................................ –40°C to 125°C
LTC3863H........................................... –40°C to 150°C
LTC3863MP........................................ –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP Package.................................................. 300°C
PIN CONFIGURATION
TOP VIEW
PLLIN/MODE
FREQ
SGND
SS
VFB
ITH
1
2
3
4
5
6
13
PGND
12 GATE
11 VIN
10 SENSE
9 CAP
8 RUN
7 VFBN
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 43°C/W, θJC = 5.5°C/W
EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
PLLIN/MODE 1
FREQ 2
SGND 3
SS 4
VFB 5
ITH 6
13
PGND
12 GATE
11 VIN
10 SENSE
9 CAP
8 RUN
7 VFBN
MSE PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3863EMSE#PBF
LTC3863EMSE#TRPBF 3863
12-Lead Plastic MSOP
–40°C to 125°C
LTC3863IMSE#PBF
LTC3863IMSE#TRPBF 3863
12-Lead Plastic MSOP
–40°C to 125°C
LTC3863HMSE#PBF
LTC3863HMSE#TRPBF 3863
12-Lead Plastic MSOP
–40°C to 150°C
LTC3863MPMSE#PBF
LTC3863MPMSE#TRPBF 3863
12-Lead Plastic MSOP
–55°C to 150°C
LTC3863EDE#PBF
LTC3863EDE#TRPBF
3863
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3863IDE#PBF
LTC3863IDE#TRPBF
3863
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3863HDE#PBF
LTC3863HDE#TRPBF
3863
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 150°C
LTC3863MPDE#PBF
LTC3863MPDE#TRPBF 3863
12-Lead (4mm × 3mm) Plastic DFN
–55°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. B
2 For more information www.analog.com


Part Number LTC3863
Description DC/DC Controller
Maker Linear Technology
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LTC3863 Datasheet PDF






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