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參數(shù)資料
| 型號(hào)： | LTC1878EMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Monolithic Synchronous Step-Down Regulator |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 605 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大?。?/td> | 225K |
| 代理商： | LTC1878EMS8 |
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1
LTC1878
I
High Efficiency: Up to 95%
I
Very Low Quiescent Current: Only 10
μ
A
During Operation
I
600mA Output Current at V
IN
= 3.3V
I
2.65V to 6V Input Voltage Range
I
550kHz Constant Frequency Operation
I
Synchronizable from 400kHz to 700kHz
I
Selectable Burst Mode
TM
Operation/
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
1878 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
6V input voltage range makes the LTC1878 ideally suited
for single Li-Ion battery-powered applications. 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 LTC1878 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 LTC1878 is available in a
space saving 8-lead MSOP package.
For higher input voltage (12V abs max) applications, refer
to the LTC1877 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
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
May 2000
Efficiency vs Output Load Current
47
μ
F***
7
6
1
2
5
3
4
SW
V
FB
LTC1878
GND
10
μ
H*
22
μ
F**
CER
220pF
V
3.3V
*
**
***
TOKO D62CB A920CY-100M
TAIYO-YUDEN CERAMIC JMK325BJ226MM
SANYO POSCAP 6TPA47M
V
OUT
CONNECTED TO V
IN
FOR 2.65V < V
IN
< 3.3V
887k
20pF
280k
1878 TA01
SYNC
V
IN
RUN
I
TH
V
IN
2.65V
TO 6V
+
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Final Electrical Specifications
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
OUTPUT CURRENT (mA)
80
75
E
85
90
95
100
0.1
10
100
1000
1878 TA02
70
1
V
IN
= 6V
V
IN
= 4.2V
V
IN
= 3.6V
Burst Mode OPERATION
V
= 3.3V
L = 10
μ
H
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1878EMS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型: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:296-25628-2 |
| LTC1878EMS8#TR | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(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 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 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 |
| LTC1878EMS8#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(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 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 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 |
| LTC1878EMS8PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 2.65-6V MSOP8 |
| LTC1878EMS8TR | 制造商:Linear Technology 功能描述: |
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