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參數資料
| 型號： | LTC1877IMS8#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 605 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 234K |
| 代理商： | LTC1877IMS8#PBF |
LTC1877
1
1877fa
TYPICAL APPLICATION
FEATURES
DESCRIPTION
High Efciency
Monolithic Synchronous
Step-Down Regulator
The LTC1877 s a high efciency monolithic synchronous
buck regulator using a constant-frequency, current mode
architecture. Supply current during operation is only 10μA
and drops to < 1μA in shutdown. The 2.65V to 10V input
voltage range makes the LTC1877 ideally suited for both
single and dual Li-Ion battery-powered applications. 100%
duty cycle provides low dropout operation, extending bat-
tery 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 exter-
nally 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 efciency
and eliminates the need for an external Schottky diode.
Low output voltages are easily supported with the 0.8V
feedback 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.
High Efciency Step-Down Converter
APPLICATIONS
n
High Efciency: Up to 95%
n
Very Low Quiescent Current: Only 10μA
During Operation
n
600mA Output Current at VIN = 5V
n
2.65V to 10V Input Voltage Range
n
550kHz Constant-Frequency Operation
n
No Schottky Diode Required
n
Low Dropout Operation: 100% Duty Cycle
n
Synchronizable from 400kHz to 700kHz
n
Selectable Burst Mode Operation or
Pulse-Skipping Mode
n
0.8V Reference Allows Low Output Voltages
n
Shutdown Mode Draws < 1μA Supply Current
n
±2% Output Voltage Accuracy
n
Current Mode Control for Excellent Line and Load
Transient Response
n
Overcurrent and Overtemperature Protected
n
Available in 8-Lead MSOP Package
n
Cellular Telephones
n
Wireless Modems
n
Personal Information Appliances
n
Portable Instruments
n
Distributed Power Systems
n
Battery-Powered Equipment
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Efciency vs Output Current
47μF***
7
6
1
2
5
3
4
SW
VFB
LTC1877
GND
10μH*
10μF**
CER
220pF
VOUT
3.3V
887k
1877 TA01
SYNC
VIN
RUN
ITH
VIN
2.65V
TO 10V
20pF
*TOKO D62CB A920CY-100M
**TAIYO-YUDEN CERAMIC LMK325BJ106MN
***SANYO POSCAP 6TPA47M
VOUT CONNECTED TO VIN FOR 2.65V < VIN < 3.3V
+
280k
OUTPUT CURRENT (mA)
0.1
EFFICIENCY
(%)
10
1000
100
95
90
85
80
75
70
65
60
55
50
1877 TA02
1.0
100
VIN = 3.6V
VIN = 10V
VOUT = 3.3V
L = 10μH
Burst Mode OPERATION
VIN = 7.2V
VIN = 5V
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1878EMS8 | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數: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: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) 供應商設備封裝:8-SOIC |
| LTC1878EMS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數: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: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) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面: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 - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數: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: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) 供應商設備封裝: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 - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數: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: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) 供應商設備封裝: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 |
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