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参数资料
| 型号： | LTC1879EGN |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.2A 16SSOP |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 10 V |
| 输入电压： | 2.65 V ~ 10 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 550kHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SSOP |
LTC1879
1.2A Synchronous
Step-Down Regulator with
15 μ A Quiescent Current
FEATURES
DESCRIPTIO
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High Efficiency: Up to 95%
Low Quiescent Current: Only 15 μ A with No Load
550kHz Constant Frequency Operation
2.65V to 10V Input Voltage Range
V OUT from 0.8V to V IN , I OUT to 1.2A
True PLL Frequency Locking from 350kHz to 750kHz
Power Good Output Voltage Monitor
Low Dropout Operation: 100% Duty Cycle
Burst Mode ? or Pulse Skipping Operation
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Mode Draws < 1 μ A Supply Current
± 2% Output Voltage Accuracy
Overcurrent and Overtemperature Protected
Available in 16-Lead SSOP Package
The LTC ? 1879 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Operating supply current is only 15 μ A
with no load and drops to < 1 μ A in shutdown. The input
supply voltage range of 2.65V to 10V makes the LTC1879
ideally suited for both single and dual Li-Ion battery-pow-
ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable systems.
The switching frequency is internally set to 550kHz, allow-
ing the use of small surface mount inductors and capaci-
tors. For noise sensitive applications, the LTC1879 can be
externally synchronized from 350kHz to 750kHz. Burst
Mode operation is inhibited during synchronization or
when the SYNC/MODE pin is pulled low.
The internal synchronous rectifier switch increases effi-
APPLICATIO S
ciency and eliminates the need for an external Schottky
diode. Low output voltages are easily supported with a
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Cellular Telephones
Portable Computers
Wireless Modems
0.8V feedback reference voltage. The LTC1879 is available
in a 16-lead SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
High Efficiency Step-Down Converter
Efficiency vs Output Load Current
V IN
2.65V TO 10V
C IN
10 μ F
13
SV IN
100
90
V IN = 3.6V
2
RUN/SS
PV IN
8, 9
80
150k
15
14
4
SYNC/MODE
LTC1879
PGOOD
I TH
SWP
SWN
PGND
5, 12
6, 11
7, 10
L1
6.2 μ H
V OUT *
3.1V
C OUT
47 μ F
70
60
50
V IN = 10V
V IN = 7.2V
47pF
220pF
SGND
V FB
3
28.0k
80.6k
40
30
Burst Mode OPERATION
V OUT = 3.1V
L = 6.2 μ H
1
0.1
1
10 100
1000
C IN : TAIYO YUDEN CERAMIC LMK325BJ106MN
1879 TA01a
OUPUT CURRENT (mA)
1879 TA01b
C OUT : TDK CERAMIC C4532X5ROJ476M
L1: TOKO A921CY6R2M
*V OUT CONNECTED TO V IN (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V IN < 3.1V
1879f
1
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相关代理商/技术参数 |
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| LTC1879EGN#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.2A 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC1879EGN#TR | 功能描述:IC REG BUCK SYNC ADJ 1.2A 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1879EGN#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1.2A 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC1879EGNPBF | 制造商:Linear Technology 功能描述:1.2A Synch Buck Regulator 15uA IQ SSOP16 |
| LTC1909-8EG | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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