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參數(shù)資料
| 型號(hào)： | LTC1779ES6 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 250mA Current Mode Step-Down DC/DC Converter in ThinSOT |
| 中文描述： | 0.5 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | LTC1779ES6 |
1
LTC1779
250mA Current Mode
Step-Down DC/DC Converter
in ThinSOT
The LTC
1779 is a constant frequency current mode step-
down DC/DC converter in a 6-lead ThinSOT package. The
part operates with a 2.5V to 9.8V input and can provide up
to 250mA of output current. Current mode control pro-
vides excellent AC and DC load and line regulation. The
device incorporates an accurate undervoltage lockout fea-
ture that shuts down the LTC1779 when the input voltage
falls below 2V.
The LTC1779 boasts a
±
2.5% output voltage accuracy and
consumes only 135
μ
A of quiescent current. For applica-
tions where efficiency is a prime consideration, the LTC1779
is configured for Burst Mode operation, which enhances
efficiency at low output current.
To further maximize the life of a battery source, the
internal P-channel MOSFET is turned on continuously in
dropout (100% duty cycle). In shutdown, the device draws
a mere 8
μ
A. High constant operating frequency of 550kHz
allows the use of a small external inductor.
The LTC1779 is available in a low profile (1mm) ThinSOT
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and ThinSOT are trademarks of Linear Technology Corporation.
Figure 1. LTC1779 High Efficiency 2.5V/100mA Step-Down Converter
I
1- or 2-Cell Lithium-Ion-Powered Applications
I
Cellular Telephones
I
Wireless Modems
I
Portable Computers
I
Distributed 3.3V, 2.5V or 1.8V Power Systems
I
Scanners
I
High Efficiency: Up to 94%
I
250mA Output Current
I
Wide V
IN
Range: 2.5V to 9.8V
I
550kHz Constant Frequency Operation
I
Burst Mode
TM
Operation at Light Load
I
Low Dropout: 100% Duty Cycle
I
0.8V Reference Allows Low Output Voltages
I
±
2.5% Reference Accuracy
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Low Quiescent Current: 135
μ
A
I
Shutdown Mode Draws Only 8
μ
A Supply Current
I
Low Profile (1mm) ThinSOT
TM
Package
Efficiency vs Load Current
I
TH
/RUN
LTC1779
GND
20k
169k
78.7k
R1
10
L1
22
μ
H
D1
100pF
V
FB
6
5
4
1779 F01a
1
2
3
SW
V
IN
SENSE
–
C1
10
μ
F
16V
C3
0.1
μ
F
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: SANYO POSCAP 6TPA47M
D1: IR10BQ015
L1: COILTRONICS UP1B220
V
2.5V
TO 9.8V
V
2.5V
100mA
C2
47
μ
F
6V
+
LOAD CURRENT (mA)
50
E
70
90
100
0.1
10
100
1000
1779 F01b
30
1
80
60
40
V
IN
= 3.3V
V
IN
= 6V
V
IN
= 9.8V
V
OUT
= 2.5V
R
SENSE
= 10
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 |
|---|---|
| LTC1779ES6#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 9.8V 6-Pin TSOT-23 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, CUT TAPE 500mA, 500kHz Step-Down Switching Regulator |
| LTC1779ES6#TR | 功能描述:IC REG BUCK ADJ 0.25A SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1779ES6#TRM | 功能描述:IC REG BUCK ADJ 0.25A SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1779ES6#TRMPBF | 功能描述:IC REG BUCK ADJ 0.25A SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):2 輸出電壓:3.3V，0.8 V ~ 2.5 V 輸入電壓:4.5 V ~ 5.5 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):1MHz 電流 - 輸出:1.5A 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:VQFN020V4040 產(chǎn)品目錄頁(yè)面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR |
| LTC1779ES6#TRPBF | 功能描述:IC REG BUCK ADJ 0.25A SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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