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参数资料
| 型号： | LTC1772ES6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM SOT23-6 |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 650kHz |
| 占空比： | 100% |
| 电源电压： | 2.5 V ~ 9.8 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
LTC1772
Constant Frequency
Current Mode Step-Down
DC/DC Controller in SOT-23
FEATURES
DESCRIPTIO
■
■
■
■
■
High Efficiency: Up to 94%
High Output Currents Easily Achieved
Wide V IN Range: 2.5V to 9.8V
Constant Frequency 550kHz Operation
Burst Mode ? Operation at Light Load
The LTC ? 1772 is a constant frequency current mode step-
down DC/DC controller providing excellent AC and DC load
and line regulation. The device incorporates an accurate
undervoltage lockout feature that shuts down the LTC1772
when the input voltage falls below 2.0V.
■ Low Dropout: 100% Duty Cycle
■ Tiny 6-Lead SOT-23 Package
■ 0.8V Reference Allows Low Output Voltages
■ Current Mode Operation for Excellent Line and Load
Transient Response
■ Low Quiescent Current: 270 μ A
■ Shutdown Mode Draws Only 8 μ A Supply Current
■ ± 2.5% Reference Accuracy
APPLICATIO S
The LTC1772 provides a ± 2.5% output voltage accuracy
and consumes only 270 μ A of quiescent current. For
applications where efficiency is a prime consideration, the
LTC1772 is configured for Burst Mode operation, which
enhances efficiency at low output current.
To further maximize the life of a battery source, the
external P-channel MOSFET is turned on continuously in
dropout (100%dutycycle).In shutdown, the device draws
a mere 8 μ A. High constant operating frequency of 550kHz
■
■
■
■
■
■
One or Two Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
Scanners
allows the use of a small external inductor.
The LTC1772 is available in a small footprint 6-lead
SOT-23.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
V IN
Efficiency vs Load Current
R1
0.03 ?
C1
10 μ F
10V
2.5V
TO 9.8V
100
90
V IN = 3.3V
V IN = 4.2V
10k
220pF
1
2
3
I TH /RUN PGATE
LTC1772
GND V IN
V FB SENSE –
6
5
4
L1
M1 4.7 μ H
D1
+
C2A
47 μ F
6V
C2B
1 μ F
10V
V OUT
2.5V
2A
174k
80
70
V IN = 9.8V
V IN = 6V
V IN = 8.4V
60
C1: TAIYO YUDEN LMK325BJ106K-T
C2A: SANYO 6TPA47M
C2B: AVX 0805ZC105KAT1A
D1: MOTOROLA MBRM120T3
80.6k
50
V OUT = 2.5V
L1: MURATA LQN6C-4R7
M1: FAIRCHILD FDC638P
1772 F01a
40
1
10
100 1000
10000
R1: IRC LRC-LR1206-01-R030F
LOAD CURRENT (mA)
1772 F01b
Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator
1772fb
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1772HS6#TRMPBF | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1772HS6#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1772IS6 | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.5V to 9.8V Input 6-Pin TSOT-23 |
| LTC1772IS6#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Down 2.5V to 9.8V Input 6-Pin TSOT-23 |
| LTC1772IS6#TR | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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