Controller. LTC3863EMSE Datasheet

LTC3863EMSE Datasheet PDF

Part LTC3863EMSE
Description DC/DC Controller
Feature LTC3863EMSE; LTC3863 60V Low IQ Inverting DC/DC Controller FEATURES n Wide Operating VIN Range: 3.5V to 60V n Wi.
Manufacture Analog Devices
Datasheet
Download LTC3863EMSE Datasheet




LTC3863EMSE
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
4.5V TO 16V
100µF
20V
Si7129
10µHB540C 511k
33µF
×2
VOUT
–5V
150µF 1.7A
16V
×2
68pF
80.6k
3863 TA01a
Document Feedback
For more information www.analog.com
Efficiency
90
9
VIN = 12V
80 VOUT = –5V
8
70
7
60
EFFICIENCY
6
50
5
40
PULSE-SKIPPING MODE 4
30
Burst Mode OPERATION 3
20
10
0
0.002
POWER LOSS
0.02
0.2
LOAD CURRENT (A)
2
1
0
2
3863 TA01b
Rev. B
1



LTC3863EMSE
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 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
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



LTC3863EMSE
LTC3863
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. (Note 4) VIN = 12V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Supply
VIN
VUVLO
Input Voltage Operating Range
Undervoltage Lockout
3.5
60
V
(VIN-VCAP) Ramping Up Threshold
l 3.25 3.50 3.8
V
(VIN-VCAP) Ramping Down Threshold
l 3.00 3.25 3.50
V
Hysteresis
0.25
V
IQ
Input DC Supply Current
Pulse-Skipping Mode
Burst Mode Operation
Shutdown Supply Current
PLLIN/MODE = 0V, FREQ = 0V,
VFB = 0.83V (No Load)
PLLIN/MODE = Open, FREQ = 0V,
VFB = 0.83V (No Load)
RUN = 0V
0.77 1.2
mA
50
70
µA
7
12
µA
Output Sensing
VREG
Regulated Feedback Voltage VREG = (VFB – VFBN) VITH = 1.2V (Note 5)
l 0.791 0.800 0.809
V
∆VREG
∆VIN
∆VREG
∆VITH
gm(EA)
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
VIN = 3.8V to 60V (Note 5)
VITH = 0.6V to 1.8V (Note 5)
VITH = 1.2V, ∆IITH = ±5µA (Note 5)
–0.005
0.005
%/V
–0.1 –0.015 0.1
%
1.8
mS
IFBN
Feedback Negative Input Bias Current
–50 –10
50
nA
Current Sensing
VILIM
ISENSE
Current Limit Threshold (VIN-VSENSE)
SENSE Pin Input Current
VFB = 0.77V
VSENSE = VIN
l 85
95
103
mV
0.1
2
µA
Start-Up and Shutdown
VRUN
VRUNHYS
ISS
RUN Pin Enable Threshold
RUN Pin Hysteresis
Soft-Start Pin Charging Current
VRUN Rising
VSS = 0V
l 1.22 1.26 1.32
V
150
mV
10
µA
Switching Frequency and Clock Synchronization
f
Programmable Switching Frequency
fLO
Low Switching Frequency
RFREQ = 24.9kΩ
RFREQ = 64.9kΩ
RFREQ = 105kΩ
FREQ = 0V
105
kHz
375 440 505
kHz
810
kHz
320 350 380
kHz
fHI
High Switching Frequency
FREQ = Open
485 535 585
kHz
fSYNC
VCLK(IH)
VCLK(LO)
Synchronization Frequency
Clock Input High Level into PLLIN/MODE
Clock Input Low Level into PLLIN/MODE
l 75
l2
l
750
kHz
V
0.5
V
fFOLD
Foldback Frequency as Percentage of
Programmable Frequency
VFB = 0V, FREQ = 0V
18
%
tON(MIN) Minimum On-Time
220
ns
Rev. B
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3







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