參數(shù)資料
型號(hào)： LTC1877
廠商： Linear Technology Corporation
英文描述： High Efficiency Monolithic Synchronous Step-Down Regulator(高效率,單片同步步降穩(wěn)壓器)
中文描述： 高效率單片同步降壓型穩(wěn)壓器（高效率，單片同步步降穩(wěn)壓器）
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 227K
代理商： LTC1877
1
LTC1877
I
High Efficiency: Up to 95%
I
Very Low Quiescent Current: Only 10
μ
A
During Operation
I
600mA Output Current at V
IN
= 5V
I
2.65V to 10V Input Voltage Range
I
550kHz Constant Frequency Operation
I
Synchronizable from 400kHz to 700kHz
I
Selectable Burst Mode
TM
Operation or
Pulse Skipping Mode
I
No Schottky Diode Required
I
Low Dropout Operation: 100% Duty Cycle
I
0.8V Reference Allows Low Output Voltages
I
Shutdown Mode Draws < 1
μ
A Supply Current
I
±
2% Output Voltage Accuracy
I
Current Mode Control for Excellent Line and
Load Transient Response
I
Overcurrent and Overtemperature Protected
I
Available in 8-Lead MSOP Package
APPLICATIU
The LTC
1877 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Supply current during operation is
only 10
μ
A and drops to < 1
μ
A in shutdown. The 2.65V to
10V input voltage range makes the LTC1877 ideally suited
for both single and dual Li-Ion battery-powered applica-
tions. 100% duty cycle provides low dropout operation,
extending battery life in portable systems.
Switching frequency is internally set at 550kHz, allowing
the use of small surface mount inductors and capacitors.
For noise sensitive applications the LTC1877 can be
externally synchronized from 400kHz to 700kHz. Burst
Mode operation is inhibited during synchronization or
when the SYNC/MODE pin is pulled low, preventing low
frequency ripple from interfering with audio circuitry.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.8V feed-
back reference voltage. The LTC1877 is available in a
space saving 8-lead MSOP package. Lower input voltage
applications (less than 7V abs max) should refer to the
LTC1878 data sheet.
I
Cellular Telephones
I
Wireless Modems
I
Personal Information Appliances
I
Portable Instruments
I
Distributed Power Systems
I
Battery-Powered Equipment
High Efficiency Step-Down Converter
High Efficiency
Monolithic Synchronous
Step-Down Regulator
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
Efficiency vs Output Current
OUTPUT CURRENT (mA)
0.1
E
10
1000
100
95
90
85
80
75
70
65
60
55
50
1877 TA02
1.0
100
V
IN
= 3.6V
V
IN
= 10V
V
= 3.3V
L = 10
μ
H
Burst Mode OPERATION
V
IN
= 7.2V
V
IN
= 5V
47
μ
F***
7
6
1
2
5
3
4
SW
V
FB
LTC1877
GND
10
μ
H*
10
μ
F**
CER
220pF
VOUT
3.3V
887k
280k
1877 TA01
SYNC
V
IN
RUN
I
TH
V
IN
2.65V
TO 10V
20pF
*
TOKO D62CB A920CY-100M
**
TAIYO-YUDEN CERAMIC LMK325BJ106MN
***
SANYO POSCAP 6TPA47M
V
OUT
CONNECTED TO V
IN
FOR 2.65V < V
IN
< 3.3V
+
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
相關(guān)PDF資料
PDF描述
LTC1878 High Efficiency Monolithic Synchronous Step-Down Regulator(高效率,單片同步步降穩(wěn)壓器)
LTC1911-15 Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
LTC1911EMS8-1.5 Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
LTC1911EMS8-1.8 Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1877EMS8 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:否 類(lèi)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(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC1877EMS8#PBF 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:是 類(lèi)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:250 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱(chēng):296-25628-2
LTC1877EMS8#TR 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:否 類(lèi)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(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC1877EMS8#TRPBF 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:是 類(lèi)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(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC1877EMS8PBF 制造商:Linear Technology 功能描述:1.5A Regulator Step Down LTC1877EMS8
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