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LTC3863IDE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38
LTC3863
1
3863fa
For more information www.linear.com/3863
Typical applicaTion
FeaTures
DescripTion
60V Low I
Q
Inverting
DC/DC Controller
The LT C
®
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 70μ
A 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.
4.5V to 16V Input, –5V/1.7A Output, 350kHz Inverting Converter
applicaTions
n
Wide Operating V
IN
Range: 3.5V to 60V
n
Wide Negative V
OUT
Range: –0.4V to Beyond –150V
n
Low Operating I
Q
= 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 I
Q
= 7µA
n
Available in Small 12-Lead Thermally Enhanced
MSOP and DFN Packages
n
Industrial and Automotive Power Supplies
n
Telecom Power Supplies
n
Distributed Power Systems
L, LT, LTC , LT M , OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered
trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5731694.
Efficiency
350kHz
16mΩ
10µH
Si7129
B540C
CAP
0.47µF
10µF
25V
×2
PGND
LTC3863
3863 TA01a
SS
ITH
FREQ
SGND
RUN
V
IN
PLLIN/MODE
SENSE
GATE
V
FBN
V
FB
14.7k
61.9k
511k
33µF
×2
V
OUT
–5V
1.7A
80.6k
68pF
V
IN
4.5V TO 16V
27nF
150µF
16V
×2
+
100µF
20V
+
LOAD CURRENT (A)
0.002
40
EFFICIENCY (%)
POWER LOSS (W)
60
90
80
0.02 0.2 2
3863 TA01b
20
30
50
70
10
0
4
6
9
8
2
3
5
7
1
0
EFFICIENCY
POWER LOSS
V
IN
= 12V
V
OUT
= –5V
PULSE-SKIPPING MODE
Burst Mode OPERATION
LTC3863
2
3863fa
For more information www.linear.com/3863
pin conFiguraTion
absoluTe MaxiMuM raTings
Input Supply Voltage (V
IN
) ......................... –0.3V to 65V
V
IN
-V
SENSE
Voltage ...................................... –0.3V to 6V
V
IN
-V
CAP
Voltage ........................................ –0.3V to 10V
RUN Voltage............................................... –0.3V to 65V
V
FBN
, PLLIN/MODE Voltages ....................... –0.3V to 6V
SS, ITH, FREQ, V
FB
Voltages ........................ –0.3V to 5V
(Note 1)
12
11
10
9
8
7
13
PGND
1
2
3
4
5
6
GATE
V
IN
SENSE
CAP
RUN
V
FBN
PLLIN/MODE
FREQ
SGND
SS
V
FB
ITH
TOP VIEW
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 150°C, θ
JA
= 43°C/W, θ
JC
= 5.5°C/W
EXPOSED PAD (PIN 13) IS PGND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
PLLIN/MODE
FREQ
SGND
SS
V
FB
ITH
12
11
10
9
8
7
GATE
V
IN
SENSE
CAP
RUN
V
FBN
TOP VIEW
13
PGND
MSE PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
= 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
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container.
Consult LT C Marketing for information on non-standard 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/
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
LTC3863
3
3863fa
For more information www.linear.com/3863
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply
V
IN
Input Voltage Operating Range 3.5 60 V
V
UVLO
Undervoltage Lockout (V
IN
-V
CAP
) Ramping Up Threshold
(V
IN
-V
CAP
) Ramping Down Threshold
Hysteresis
l
l
3.25
3.00
3.50
3.25
0.25
3.8
3.50
V
V
V
I
Q
Input DC Supply Current
Pulse-Skipping Mode PLLIN/MODE = 0V, FREQ = 0V,
V
FB
= 0.83V (No Load)
0.77 1.2 mA
Burst Mode Operation PLLIN/MODE = Open, FREQ = 0V,
V
FB
= 0.83V (No Load)
50 70 µA
Shutdown Supply Current RUN = 0V 7 12 µA
Output Sensing
V
REG
Regulated Feedback Voltage V
REG
= (V
FB
– V
FBN
) V
ITH
= 1.2V (Note 5)
l
0.791 0.800 0.809 V
∆V
REG
∆V
IN
Feedback Voltage Line Regulation V
IN
= 3.8V to 60V (Note 5) –0.005 0.005 %/V
∆V
REG
∆V
ITH
Feedback Voltage Load Regulation V
ITH
= 0.6V to 1.8V (Note 5) –0.1 –0.015 0.1 %
g
m(EA)
Error Amplifier Transconductance V
ITH
= 1.2V, ∆I
ITH
= ±5µA (Note 5) 1.8 mS
I
FBN
Feedback Negative Input Bias Current –50 –10 50 nA
Current Sensing
V
ILIM
Current Limit Threshold (V
IN
-V
SENSE
) V
FB
= 0.77V
l
85 95 103 mV
I
SENSE
SENSE Pin Input Current V
SENSE
= V
IN
0.1 2 µA
Start-Up and Shutdown
V
RUN
RUN Pin Enable Threshold V
RUN
Rising
l
1.22 1.26 1.32 V
V
RUNHYS
RUN Pin Hysteresis 150 mV
I
SS
Soft-Start Pin Charging Current V
SS
= 0V 10 µA
Switching Frequency and Clock Synchronization
f Programmable Switching Frequency R
FREQ
= 24.9kΩ
R
FREQ
= 64.9kΩ
R
FREQ
= 105kΩ
375
105
440
810
505
kHz
kHz
kHz
f
LO
Low Switching Frequency FREQ = 0V 320 350 380 kHz
f
HI
High Switching Frequency FREQ = Open 485 535 585 kHz
f
SYNC
Synchronization Frequency
l
75 750 kHz
V
CLK(IH)
Clock Input High Level into PLLIN/MODE
l
2 V
V
CLK(LO)
Clock Input Low Level into PLLIN/MODE
l
0.5 V
f
FOLD
Foldback Frequency as Percentage of
Programmable Frequency
V
FB
= 0V, FREQ = 0V 18 %
t
ON(MIN)
Minimum On-Time 220 ns
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. (Note 4) V
IN
= 12V, unless otherwise noted.
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LTC3863IDE#PBF

Mfr. #:
Buy LTC3863IDE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 60V Low IQ Inverting Buck-Boost DC/DC PMOS Controller
Lifecycle:
New from this manufacturer.
Delivery:
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