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Linear Technology Electronic Components Datasheet

LTC3775EUD Datasheet

High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller

No Preview Available !

FEATURES
n Wide VIN Range: 4.5V to 38V
n Line Feedforward Compensation
n Low Minimum On-Time: tON(MIN) < 30ns
n Powerful Onboard MOSFET Drivers
n Leading Edge Modulation Voltage Mode Control
n ±0.75%, 0.6V Reference Voltage Accuracy Over
Temperature
n VOUT Range: 0.6V to 0.8VIN
n Programmable, Cycle-by-Cycle Peak Current Limit
n Sense Resistor or RDS(ON) Current Sensing
n Programmable Soft-Start
n Synchronizable Fixed Frequency from 250kHz to 1MHz
n Selectable Pulse-Skipping or Forced Continuous
Modes of Operation
n Low Shutdown Current: 14μA Typical
n Thermally Enhanced 16-Lead MSOP and 3mm × 3mm
QFN Packages
APPLICATIONS
n Automotive Systems
n Telecom and Industrial Power Supplies
n Point of Load Applications
LTC3775
High Frequency
Synchronous Step-Down
Voltage Mode DC/DC
Controller
DESCRIPTION
The LTC®3775 is a high efficiency synchronous step-down
switching DC/DC controller that drives an all N-channel
power MOSFET stage from a 4.5V to 38V input supply
voltage. A patented line feedforward compensation circuit
and a high bandwidth error amplifier provide very fast line
and load transient response.
High step-down ratios are made possible by a low 30ns
minimum on-time, allowing extremely low duty cycles.
MOSFET RDS(ON) current sensing maximizes efficiency.
Alternatively, a sense resistor can be used for higher cur-
rent limit accuracy. Continuous monitoring of the voltages
across the top and bottom MOSFETs allows cycle-by-cycle
control of the inductor current, configurable by external
resistors.
The soft-start function controls the duty cycle during
start-up, providing a smooth output voltage ramp up. The
operating frequency is user programmable from 250kHz
to 1MHz and can be synchronized to an external clock.
L, LT, LTC, LTM, Linear Technology, the Linear logo are registered trademarks, No RSENSE
and UltraFast are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5408150, 5481178,
5705919, 6580258, 5847554, 5055767.
TYPICAL APPLICATION
VIN
330μF 5V TO 28V
35V
3.16k
57.6k
4.7μF
0.01μF
39.2k
330pF
ILIMT VIN
TG
ILIMB
SENSE
LTC3775
INTVCC BOOST
SW
SS
BG
FREQ
PGND
FB
0.1μF
0.36μH
VOUT
1.2V
470μF 15A
2.5V
×2
3.9nF
10k 10k
4.7k
COMP
SGND
3775 TA01a
Efficiency and Power Loss vs Load Current
100
5
90
VIN = 12V
VOUT = 1.2V
80 CONTINUOUS MODE
4
SW FREQ = 500kHz
70
60
3
EFFICIENCY
50
40
2
30
20
1
POWER LOSS
10
0
0.01
0.1
1
10
LOAD CURRENT (A)
0
100
3775 TA01b
3775fa
1


Linear Technology Electronic Components Datasheet

LTC3775EUD Datasheet

High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller

No Preview Available !

LTC3775
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage
VIN ......................................................... –0.3V to 40V
BOOST ................................................... –0.3V to 46V
BOOST-SW............................................... –0.3V to 6V
SW............................................................ –5V to 40V
ILIMT .............................................................–0.3V to VIN
SENSE.............................................................–5V to VIN
INTVCC ......................................................... –0.3V to 6V
RUN/SHDN................................................... –0.3V to 6V
FB, MODE/SYNC ................................... –0.3V to INTVCC
FREQ, ILIMB, SS..................................... –0.3V to INTVCC
INTVCC RMS Currents... .........................................50mA
Operating Junction Temperature Range
(Note 2).................................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13
ILIMT 1
ILIMB 2
FB 3
17
PGND
12 SW
11 VIN
10 SENSE
COMP 4
9 INTVCC
5678
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W, θJC = 4.2°C/W (NOTE 3)
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
MODE/SYNC 1
RUN/SHDN 2
ILIMT 3
ILIMB 4
FB 5
COMP 6
SS 7
FREQ 8
TOP VIEW
17
PGND
16 BOOST
15 TG
14 SW
13 VIN
12 SENSE
11 INTVCC
10 BG
9 SGND
MSE PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 40°C/W (NOTE 3)
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3775EUD#PBF
LTC3775EUD#TRPBF
LDJK
16-Lead (3mm × 3mm) Plastic QFN –40°C to 85°C
LTC3775IUD#PBF
LTC3775IUD#TRPBF
LDJK
16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC3775EMSE#PBF
LTC3775EMSE#TRPBF 3775
16-Lead Plastic MSOP
–40°C to 85°C
LTC3775IMSE#PBF
LTC3775IMSE#TRPBF 3775
16-Lead Plastic MSOP
–40°C to 125°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/
3775fa
2


Part Number LTC3775EUD
Description High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller
Maker Linear
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