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Linear Technology Electronic Components Datasheet

LTC3879 Datasheet

Wide Operating Range No RSENSE Step-Down Controller

No Preview Available !

FEATURESwww.datasheet4u.com
n Wide VIN Range: 4V to 38V
n ±1% 0.6V Voltage Reference
n Extremely Fast Transient Response
n tON(MIN): 43ns
n No RSENSE™ Valley Current Mode Control
n Stable with Low ESR Ceramic COUT
n Supports Smooth Start-Up in Pre-Biased Output
n Optimized for High Step-Down Ratios
n Adjustable Output Voltage Soft-Start or Tracking
n Power Good Output Voltage Monitor
n Dual N-Channel MOSFET Synchronous Drive
n Adjustable Switching Frequency
n Programmable Current Limit with Foldback
n Output Overvoltage Protection
n 16-Pin MSOP and 3mm × 3mm QFN Packages
APPLICATIONS
n Distributed Power Systems
n Embedded Computing
n Communications Infrastructure
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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, 6100678, 6580258, 5847554, 6304066.
LTC3879
Fast, Wide Operating
Range No RSENSE
Step-Down Controller
DESCRIPTION
The LTC®3879 is a synchronous step-down switching
regulator controller optimized for high switching frequency
and fast transient response. The constant on-time valley
current mode architecture allows for a wide input range,
including very low duty factor operation. No external sense
resistor or slope compensation is required. System flex-
ibility is offered through a user-programmable soft-start pin
and independent RUN pin. The voltage ramping soft-start
function can be programmed with a capacitor or made to
track an external reference source.
Operating frequency is set by an external resistor and
compensated for variations in VIN to offer excellent line
stability. Discontinuous mode operation provides high
efficiency during light load conditions. A forced continu-
ous control pin allows the user to reduce noise and RF
interference. Safety features include output overvoltage
protection and programmable current limit with foldback.
The current limit is user programmable.
The LTC3879 allows operation from 4V to 38V at the input
and from 0.6V to 90% VIN at the output. The LTC3879 is
available in a small 16-pin thermally enhanced MSOP or
3mm × 3mm QFN packages.
TYPICAL APPLICATION
High Efficiency Step-Down Converter
0.1μF
RUN ION
TRACK/SS VIN
220pF
27k
TG
LTC3879
ITH SW
SGND BOOST
MODE
INTVCC
BG
PGOOD PGND
VRNG
VFB
432k
RJK0305
0.56μH
0.22μF
4.7μF
RJK0330
10k
VIN
4.5V TO 28V
10μF
VOUT
1.2V
15A
330μF
s2
10k
3879 TA01a
Efficiency vs Load Current
100
90 DISCONTINUOUS
MODE
80
70
60 CONTINUOUS
MODE
50
40
30
20
10
0
0.01
VIN = 12V
VOUT = 1.2V
SW FREQ = 400kHz
FIGURE 10 CIRCUIT
0.1 1
10
LOAD CURRENT (A)
100
3879 TA01b
3879f
1


Linear Technology Electronic Components Datasheet

LTC3879 Datasheet

Wide Operating Range No RSENSE Step-Down Controller

No Preview Available !

LTC3879
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ......................... –0.3V to 40V
ION Voltage................................................. –0.3V to 40V
wwwB.dOatOasShTeeVt4oul.tcaogme .......................................... –0.3V to 46V
SW Voltage ................................................... –5V to 40V
INTVCC, (BOOST-SW), TRACK/SS, RUN,
PGOOD Voltages .......................................... –0.3V to 6V
MODE, VRNG Voltages ................–0.3V to INTVCC + 0.3V
VFB, ITH Voltages ....................................... –0.3V to 2.7V
Operating Temperature Range (Note 4)....–40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP Only ....................................................... 300°C
PIN CONFIGURATION
TOP VIEW
TRACK/SS 1
16 BOOST
PGOOD 2
15 TG
VRNG 3
14 SW
MODE 4
ITH 5
17
13 PGND
12 BG
SGND 6
11 INTVCC
ION 7
10 VIN
VFB 8
9 RUN
MSE PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
TOP VIEW
16 15 14 13
TRACK/SS 1
12 BG
PGOOD 2 17 11 INTVCC
VRNG 3
10 VIN
MODE 4
9 RUN
5678
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W, θJC = 4.2°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3879EMSE#PBF
LTC3879EMSE#TRPBF 3879
16-Lead Plastic MSOP
–40°C to 85°C (Note 4)
LTC3879IMSE#PBF
LTC3879IMSE#TRPBF 3879
16-Lead Plastic MSOP
–40°C to 85°C (Note 4)
LTC3879EUD#PBF
LTC3879EUD#TRPBF
LDTM
16-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C (Note 4)
LTC3879IUD#PBF
LTC3879IUD#TRPBF
LDTM
16-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C (Note 4)
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/
3879f
2


Part Number LTC3879
Description Wide Operating Range No RSENSE Step-Down Controller
Maker Linear Technology Corporation
Total Page 28 Pages
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