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参数资料
| 型号： | LTC3778EF#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 电源电压： | 4 V ~ 36 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 ~ 85°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC3778EFTR |
LTC3778
Wide Operating Range,
No R SENSE TM Step-Down Controller
FEATURES
DESCRIPTIO
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Wide V IN Range: 4V to 36V
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t ON(MIN) ≤ 100ns
Stable with Ceramic C OUT
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor
± 1% 0.6V Reference
Adjustable Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Micropower Shutdown: I Q ≤ 30 μ A
Available in a 1mm 20-Lead TSSOP Package
The LTC ? 3778 is a synchronous step-down switching
regulator controller for computer memory, automobile
and other DC/DC power supplies. The controller uses a
valley current control architecture to deliver very low duty
cycles without requiring a sense resistor. Operating fre-
quency is selected by an external resistor and is compen-
sated for variations in V IN and V OUT .
Discontinuous mode operation provides high efficiency
operation at light loads. A forced continuous control pin
reduces noise and RF interference, and can assist second-
ary winding regulation when the main output is lightly
loaded. SENSE + and SENSE – pins provide true Kelvin
sensing across the optional sense resistor or the
sychronous MOSFET.
Fault protection is provided by internal foldback current
APPLICATIO S
limiting, an output overvoltage comparator, optional short-
circuit shutdown timer and input undervoltage lockout.
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Notebook and Palmtop Computers, PDAs
Battery Chargers
Distributed Power Systems
DDR Memory Power Supply
Automobile DC Power Supply
Soft-start capability for supply sequencing is accom-
plished using an external timing capacitor. The regulator
current limit level is user programmable. Wide supply
range allows operation from 4V to 36V at the input and
from 0.6V up to (0.9)V IN at the output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
R ON
C IN
C C
500pF
C SS
0.1 μ F
R C
20k
I ON
V IN
RUN/SS TG
SW
I TH BOOST
LTC3778
SGND INTV CC
DRV CC
BG
1.4M
C B 0.22 μ F
D B
CMDSH-3
M1
Si4884
M2
Si4874
L1
1.8 μ H
D1
B340A
+
V IN
5V TO 28V
10 μ F
35V
× 3 V OUT
2.5V
C OUT 10A
180 μ F
4V
× 2
100
90
80
Efficiency vs Load Current
V IN = 5V
V IN = 25V
SENSE +
SENSE –
+
C VCC
4.7 μ F
R2
40.2k
70
PGOOD
PGND
V FB
R1
60
0.01
0.1 1
LOAD CURRENT (A)
10
12.7k
3778 F01b
3778 F01a
Figure 1. High Efficiency Step-Down Converter
3778f
1
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相关代理商/技术参数 |
参数描述 |
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| LTC3780EG | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 24-Pin SSOP |
| LTC3780EG#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3780EG#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 24-Pin SSOP T/R |
| LTC3780EG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3780EGPBF | 制造商:Linear Technology 功能描述:4-Switch Buck-Boost Controller SSOP24 |
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