參數(shù)資料
型號： LTC3775IMSE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁數(shù)： 1/34頁
文件大?。?/td> 534K
代理商： LTC3775IMSE#PBF
LTC3775
1
3775fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Frequency
Synchronous Step-Down
Voltage Mode DC/DC
Controller
The LTC
3775 is a high efciency 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 amplier 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 efciency.
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, congurable 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.
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
n Automotive Systems
n Telecom and Industrial Power Supplies
n Point of Load Applications
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.
0.1μF
0.36μH
470μF
2.5V
×2
330μF
35V
VIN
5V TO 28V
VOUT
1.2V
15A
3775 TA01a
4.7μF
330pF
3.9nF
57.6k
39.2k
4.7k
10k
3.16k
0.01μF
TG
VIN
LTC3775
SGND
SENSE
ILIMT
ILIMB
INTVCC
SS
BG
PGND
COMP
BOOST
SW
FREQ
FB
LOAD CURRENT (A)
30
EFFICIENCY
(%)
POWER
LOSS
(W)
90
100
20
10
80
50
70
60
40
0.01
1
10
100
3775 TA01b
0
1
2
3
4
5
0
0.1
EFFICIENCY
POWER LOSS
VIN = 12V
VOUT = 1.2V
CONTINUOUS MODE
SW FREQ = 500kHz
Efciency and Power Loss vs Load Current
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