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參數(shù)資料
| 型號： | LTC1771I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal D-Type Edge-Triggered Read-Back Latches 24-PDIP 0 to 70 |
| 中文描述： | 低靜態(tài)電流高效率降壓DC / DC控制器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 205K |
| 代理商： | LTC1771I |
1
LTC1771
I
Very Low Standby Current: 10
μ
A
I
Available in Space-Saving 8-Lead MSOP Package
I
High Output Currents
I
Wide V
IN
Range: 2.8V to 20V Operation
I
V
OUT
Range: 1.23V to 18V
I
High Efficiency: Over 93% Possible
I
±
2% Output Accuracy
I
Very Low Dropout Operation: 100% Duty Cycle
I
Current Mode Operation for Excellent Line and
Load Transient Response
I
Defeatable Burst Mode
TM
Operation
I
Short-Circuit Protected
I
Optional Programmable Soft-Start
I
Micropower Shutdown: I
Q
= 2
μ
A
The LTC
1771 is a high efficiency current mode step-
down DC/DC controller that draws as little as 10
μ
A DC
supply current to regulate the output at no load while
maintaining high efficiency for loads up to several amps.
The LTC1771 drives an external P-channel power MOSFET
using a current mode, constant off-time architecture. An
external sense resistor is used to program the operating
current level. Current mode control provides short-circuit
protection, excellent transient response and controlled
start-up behavior. Burst Mode operation enables the
LTC1771 to maintain high efficiency down to extremely
low currents. Shutdown mode further reduces the supply
current to a mere 2
μ
A. For low noise applications, Burst
Mode operation can be easily disabled with the MODE pin.
Wide input supply range of 2.8V to 18V (20V maximum)
and 100% duty cycle operation for low dropout make the
LTC1771 ideal for a wide variety of battery-powered appli-
cations where maximizing battery life is important.
The LTC1771’s availability in both 8-lead MSOP and SO
packages provides for a minimum area solution.
I
Cellular Telephones and Wireless Modems
I
1- to 4-Cell Lithium-Ion-Powered Applications
I
Portable Instruments
I
Battery-Powered Equipment
I
Battery Chargers
I
Scanners
Figure 1. High Efficiency Step-Down Converter
Low Quiescent Current
High Efficiency Step-Down
DC/DC Controller
February 2000
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
RUN/SS
I
TH
V
FB
V
IN
V
IN
R2
1.64M
1%
V
4.5V TO 18V
R
C
10k
C
22OpF
R
0.05
R1
1M
1%
M1
Si6447DQ
UPS5817
L1
15
μ
H
5pF
10
μ
F
25V
CER
C
OUT
150
μ
F
6.3V
V
3.3V
2A
1771 F01
C
SS
0.01
μ
F
PGATE
MODE
LTC1771
GND
SENSE
+
LTC1771 Efficiency
LOAD CURRENT (mA)
E
100
90
80
70
60
50
40
0.1
1
100
1000
10000
1771 F01b
10
V
IN
= 5V
V
IN
= 10V
V
IN
= 15V
V
OUT
= 3.3V
R
SENSE
= 0.05
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
FEATURES
DESCRIPTIOU
APPLICATIU
TYPICAL APPLICATIO
U
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1771IS8 | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):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) |
| LTC1771IS8#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC1771IS8#TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):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) |
| LTC1771IS8#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):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) |
| LTC1772BES6 | 制造商:Linear Technology 功能描述:IC CTRLR DC/DC S-DWN SOT23-6 |
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