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Linear Technology Electronic Components Datasheet

LTC3864 Datasheet

60V Low IQ Step-Down DC/DC Controller

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LTC3864 pdf
LTC3864
60V Low IQ Step-Down
DC/DC Controller with
100% Duty Cycle Capability
Features
n Wide Operating VIN Range: 3.5V to 60V
n Wide VOUT Range: 0.8V to VIN
n Low Operating IQ = 40µA
n Very Low Dropout Operation: 100% Duty Cycle
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 Power Good Output Voltage Monitor
n Low Shutdown IQ = 7µA
n Available in Small 12-Pin Thermally Enhanced MSOP
and DFN Packages
Applications
n Industrial and Automotive Power Supplies
n Telecom Power Supplies
n Distributed Power Systems
Description
The LTC®3864 is a robust, high voltage step-down DC/DC
controller optimized for automotive and industrial applica-
tions. It drives a P-channel power MOSFET switch allowing
100% duty cycle operation. The wide input and output volt-
age ranges cover a multitude of applications. This device
has been verified with the failure mode and effects analysis
(FMEA) procedure for operation during failure conditions.
The LTC3864 offers excellent light load efficiency, draw-
ing only 40µA 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 LTC3864 offers programmable soft-start or output
tracking. Safety features include overvoltage protection,
overcurrent and short-circuit protection including fre-
quency foldback and a power good output signal.
The LTC3864 is available in thermally enhanced 12-Pin
MSOP and 3mm × 4mm DFN packages.
L, LT, LTC, LTM, 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.
Typical Application
5.2V to 60V Input, 5V/2A Output, 350kHz Step-Down Converter
0.47µF
VIN*
5.2V TO 60V
10µF
350kHz
3.3nF 9.09k
RUN CAP
VIN
PLLIN/MODE
SS SENSE
LTC3864 GATE
ITH
FREQ
SGND
PGOOD
25mΩ
10µH
100k 422k
VOUT*
5V
2A
47µF
×2
*VOUT FOLLOWS VIN
WHEN 3.5V ≤ VIN ≤ 5.2V
PGND
VFB
80.6k
3864 TA01a
Efficiency
100
Burst Mode
90 OPERATION
80
PULSE-SKIPPING
70
60
50
0.01
VIN = 12V
VOUT = 5V
0.1
LOAD CURRENT (A)
1
3864 TA01b
For more information www.linear.com/LTC3864
3864fa
1


Linear Technology Electronic Components Datasheet

LTC3864 Datasheet

60V Low IQ Step-Down DC/DC Controller

No Preview Available !

LTC3864 pdf
LTC3864
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
PGOOD, PLLIN/MODE Voltages.................... –0.3V to 6V
SS, ITH, FREQ, VFB Voltages......................... –0.3V to 5V
Operating Junction Temperature Range (Notes 2, 3, 4)
LTC3864E,I ........................................ –40°C to 125°C
LTC3864H........................................... –40°C to 150°C
LTC3864MP........................................ –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 PGOOD
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 FOR OPTIMAL
THERMAL PERFORMANCE
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 PGOOD
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 FOR OPTIMAL
THERMAL PERFORMANCE
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3864EMSE#PBF
LTC3864EMSE#TRPBF 3864
12-Lead Plastic MSOP
–40°C to 125°C
LTC3864IMSE#PBF
LTC3864IMSE#TRPBF 3864
12-Lead Plastic MSOP
–40°C to 125°C
LTC3864HMSE#PBF
LTC3864HMSE#TRPBF 3864
12-Lead Plastic MSOP
–40°C to 150°C
LTC3864MPMSE#PBF
LTC3864MPMSE#TRPBF 3864
12-Lead Plastic MSOP
–55°C to 150°C
LTC3864EDE#PBF
LTC3864EDE#TRPBF
3864
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3864IDE#PBF
LTC3864IDE#TRPBF
3864
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3864HDE#PBF
LTC3864HDE#TRPBF
3864
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 150°C
LTC3864MPDE#PBF
LTC3864MPDE#TRPBF 3864
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 LTC 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/
3864fa
2 For more information www.linear.com/LTC3864


Part Number LTC3864
Description 60V Low IQ Step-Down DC/DC Controller
Maker Linear Technology
Total Page 30 Pages
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