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参数资料
| 型号： | LTC1772BIS6#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | PLASTIC, MO-193, SOT-23, 6 PIN |
| 文件页数： | 1/16页 |
| 文件大小： | 223K |
| 代理商： | LTC1772BIS6#TR |
LTC1772B
1
1772bfa
TYPICAL APPLICATION
DESCRIPTION
Constant Frequency
Current Mode Step-Down
DC/DC Controller in SOT-23
The LTC1772B 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
LTC1772B when the input voltage falls below 2.0V.
The LTC1772B provides a ± 2.5% output voltage accuracy
and consumes only 270μA of quiescent current. In shut-
down, the device draws a mere 8μA.
To further maximize the life of a battery source, the
external P-channel MOSFET is turned on continuously
in dropout (100% duty cycle). High constant operating
frequency of 550kHz allows the use of a small external
inductor.
The LTC1772B is available in a small footprint 6-lead
TSOT-23.
For a Burst Mode operation enabled version of the
LTC1772B, please refer to the LTC1772 data sheet.
Figure 1. High Efciency, High Output Current 2.5V/2A Regulator
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
n Burst Mode Operation Disabled for Lower Output
Ripple at Light Loads
n High Efciency: Up to 94%
n High Output Currents Easily Achieved
n Wide VIN Range: 2.5V to 9.8V
n Constant Frequency 550kHz Operation
n Low Dropout: 100% Duty Cycle
n Output Voltage Down to 0.8V
n Current Mode Operation for Excellent Line and Load
Transient Response
n Shutdown Mode Draws Only 8A Supply Current
n Tiny 6-Lead TSOT-23 Package
n One or Two Lithium-Ion-Powered Applications
n Cellular Telephones
n Wireless Devices
n Portable Computers
n Distributed 3.3V, 2.5V or 1.8V Power Systems
ITH/RUN
LTC1772B
10k
R1
0.03Ω
174k
80.6k
L1
4.7μH
M1
D1
220pF
C1: TAIYO YUDEN LMK325BJ106K-T
C2A: SANYO 6TPA47M
C2B: AVX 0805ZC105KAT1A
D1: MOTOROLA MBRM120T3
L1: MURATA LQN6C-4R7
M1: FAIRCHILD FDC638P
R1: IRC LRC-LR1206-01-R030F
GND
VFB
6
5
4
1772 F01a
1
2
3
PGATE
VIN
SENSE–
C1
10μF
10V
C2B
1μF
10V
VIN
2.5V
TO 9.8V
VOUT
2.5V
2A
C2A
47μF
6V
+
LOAD CURRENT (mA)
EFFICIENCY
(%)
80
85
100
70
75
65
60
90
95
100
1000
10000
10
VIN = 3.6V
VOUT = 2.5V
LTC1772
Burst Mode
OPERATION
LTC1772B
NON-Burst Mode
OPERATION
*OUTPUT RIPPLE WAVEFORMS FOR THE CIRCUIT
OF FIGURE 1 APPEAR IN FIGURE 2.
1772 F01b
Efciency vs Load Current*
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1772CS6 | 制造商:Linear Technology 功能描述:Swithed-Mode Power Supply Controller, Current Mode Type, 3 Pin, Plastic, TO-236 |
| LTC1772CS6#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 制造商:Linear Technology 功能描述:BUCK 2.8 - 20V 5A 1.23-18V 6SOT23 制造商:Linear Technology 功能描述:BUCK, 2.8 - 20V, 5A, 1.23-18V, 6SOT23 |
| LTC1772CS6#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) |
| LTC1772CS6#TRM | 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) |
| LTC1772CS6#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) |
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