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參數資料
| 型號： | LTC3778 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Wide Operating Range, No RSENSE Step-Down Controller |
| 中文描述： | 寬工作，無檢測電阻范圍步降控制器 |
| 文件頁數： | 1/24頁 |
| 文件大?。?/td> | 297K |
| 代理商： | LTC3778 |
1
LTC3778
3778f
FEATURES
DESCRIPTIOU
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
limiting, an output overvoltage comparator, optional short-
circuit shutdown timer and input undervoltage lockout.
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.
APPLICATIU
TYPICAL APPLICATIOU
Wide Operating Range,
No R
SENSE
TM
Step-Down Controller
I
Wide V
IN
Range: 4V to 36V
I
Sense Resistor Optional
I
True Current Mode Control
I
2% to 90% Duty Cycle at 200kHz
I
t
ON(MIN)
≤
100ns
I
Stable with Ceramic C
OUT
I
Dual N-Channel MOSFET Synchronous Drive
I
Power Good Output Voltage Monitor
I
±
1% 0.6V Reference
I
Adjustable Current Limit
I
Adjustable Switching Frequency
I
Programmable Soft-Start
I
Output Overvoltage Protection
I
Optional Short-Circuit Shutdown Timer
I
Micropower Shutdown: I
Q
≤
30
μ
A
I
Available in a 1mm 20-Lead TSSOP Package
I
Notebook and Palmtop Computers, PDAs
I
Battery Chargers
I
Distributed Power Systems
I
DDR Memory Power Supply
I
Automobile DC Power Supply
Figure 1. High Efficiency Step-Down Converter
Efficiency vs Load Current
LOAD CURRENT (A)
0.01
E
80
90
3778 F01b
70
60
0.1
1
10
100
V
IN
= 5V
V
IN
= 25V
+
D
CMDSH-3
D1
B340A
L1
1.8
μ
H
C
VCC
4.7
μ
F
C
IN
10
μ
F
35V
×
3
V
5V TO 28V
V
2.5V
10A
+
C
OUT
180
μ
F
4V
×
2
M2
Si4874
3778 F01a
M1
Si4884
R
1.4M
C
SS
0.1
μ
F
I
ON
V
IN
TG
SW
BOOST
RUN/SS
I
TH
SGND
INTV
CC
DRV
CC
BG
PGND
SENSE
–
SENSE
+
V
FB
PGOOD
C
B
0.22
μ
F
R
C
20k
LTC3778
C
C
500pF
R2
40.2k
R1
12.7k
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC3778EF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3778EF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數:1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC3778EF#TR | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3778EF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| 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 |
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