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参数资料
| 型号： | LTC3775IUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/34页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QFN |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 80% |
| 电源电压： | 4.5 V ~ 38 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3775
High Frequency
Synchronous Step-Down
Voltage Mode DC/DC
Controller
FEATURES
DESCRIPTION
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Wide V IN Range: 4.5V to 38V
Line Feedforward Compensation
Low Minimum On-Time: t ON(MIN) < 30ns
Powerful Onboard MOSFET Drivers
Leading Edge Modulation Voltage Mode Control
±0.75%, 0.6V Reference Voltage Accuracy Over
Temperature
V OUT Range: 0.6V to 0.8V IN
Programmable, Cycle-by-Cycle Peak Current Limit
Sense Resistor or R DS(ON) Current Sensing
Programmable Soft-Start
Synchronizable Fixed Frequency from 250kHz to 1MHz
Selectable Pulse-Skipping or Forced Continuous
Modes of Operation
Low Shutdown Current: 14μA Typical
Thermally Enhanced 16-Lead MSOP and 3mm × 3mm
The LTC ? 3775 is a high ef?ciency 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 ampli?er 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 R DS(ON) current sensing maximizes ef?ciency.
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, con?gurable by external
resistors.
The soft-start function controls the duty cycle during
QFN Packages
APPLICATIONS
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.
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Automotive Systems
Telecom and Industrial Power Supplies
Point of Load Applications
L , LT, LTC, LTM, Linear Technology, the Linear logo are registered trademarks, No R SENSE
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
V IN
Ef?ciency and Power Loss vs Load Current
V IN
3.16k
57.6k
4.7μF
I LIMT
I LIMB
TG
SENSE
LTC3775
0.1μF
330μF
35V
5V TO 28V
100
90
80
70
V IN = 12V
V OUT = 1.2V
CONTINUOUS MODE
SW FREQ = 500kHz
5
4
0.01μF
39.2k
330pF
INTV CC
SS
FREQ
FB
COMP
BOOST
SW
BG
PGND
0.36μH
V OUT
1.2V
470μF 15A
2.5V
× 2
60
50
40
30
20
10
EFFICIENCY
POWER LOSS
3
2
1
10k
10k
3.9nF
4.7k
SGND
0
0.01
0.1
1 10
0
100
LOAD CURRENT (A)
3775 TA01a
3775 TA01b
3775fa
1
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| LTC3776EGN | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 2.75V to 9.8V Input 24-Pin SSOP N |
| LTC3776EGN#PBF | 功能描述:IC CTLR SYNC DUAL 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC3776EGN#TRPBF | 功能描述:IC CNTRLR SYNC DUAL 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3776EGNPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Dual Step-Down SSOP24 |
| LTC3776EUF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 2.75V to 9.8V Input 24-Pin QFN EP |
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