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參數(shù)資料
| 型號： | LTC1772BES6 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 |
| 中文描述： | 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, MO-193, SOT-23, 6 PIN |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 196K |
| 代理商： | LTC1772BES6 |
1
LTC1772B
FEATURES
APPLICATIU
DESCRIPTIOU
TYPICAL APPLICATIO
N
U
Constant Frequency
Current Mode Step-Down
DC/DC Controller in SOT-23
The LTC
1772B 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 270
μ
A of quiescent current. In shut-
down, the device draws a mere 8
μ
A.
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
SOT-23.
For a Burst Mode operation enabled version of the
LTC1772B, please refer to the LTC1772 data sheet.
Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator
I
One or Two Lithium-Ion-Powered Applications
I
Cellular Telephones
I
Wireless Devices
I
Portable Computers
I
Distributed 3.3V, 2.5V or 1.8V Power Systems
I
Burst Mode
TM
Operation Disabled for Lower Output
Ripple at Light Loads
I
High Efficiency: Up to 94%
I
High Output Currents Easily Achieved
I
Wide V
IN
Range: 2.5V to 9.8V
I
Constant Frequency 550kHz Operation
I
Low Dropout: 100% Duty Cycle
I
Output Voltage down to 0.8V
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Shutdown Mode Draws Only 8
μ
A Supply Current
I
Tiny 6-Lead SOT-23 Package
Efficiency vs Load Current*
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
I
TH
/RUN
LTC1772B
10k
R1
0.03
174k
80.6k
L1
4.7
μ
H
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
V
FB
6
5
4
1772 F01a
1
3
PGATE
V
IN
SENSE
–
C1
10
μ
F
10V
C2B
1
μ
F
10V
V
2.5V
TO 9.8V
V
2.5V
2A
C2A
47
μ
F
6V
+
LOAD CURRENT (mA)
E
80
85
100
70
75
65
60
90
95
100
1000
10000
10
V
IN
= 3.6V
V
OUT
= 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1772BES6#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:DC-DC CONTROLLER BUCK 5A TS 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 5A, TSOT-23-6; Primary Input Voltage:9.8V; No. of Outputs:1; Output Current:5A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-TSOT-23; Supply Voltage Max:9.8V;RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 5A, TSOT-23-6; Primary Input Voltage:9.8V; No. of Outputs:1; Output Current:5A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-TSOT-23 ;RoHS Compliant: Yes |
| LTC1772BES6#TR | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 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) |
| LTC1772BES6#TRM | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 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) |
| LTC1772BES6#TRMPBF | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 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(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):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(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC1772BES6#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM SOT23-6 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) |
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