Datasheet LTC3410-1.875 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
| 页数 / 页 | 16 / 1 — FEATURES. DESCRIPTIO. High Efficiency: Up to 93%. Very Low Quiescent … |
| 文件格式/大小 | PDF / 238 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. High Efficiency: Up to 93%. Very Low Quiescent Current: Only 26. Low Output Voltage Ripple
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LTC3410-1.875 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 93%
The LTC®3410-1.875 is a high efficiency monolithic syn- ■
Very Low Quiescent Current: Only 26
µ
A
chronous buck regulator using a constant frequency, ■
Low Output Voltage Ripple
current mode architecture. Supply current during opera- ■
300mA Output Current at VIN = 3V
tion is only 26µA, dropping to <1µA in shutdown. The 2.5V ■
380mA Minimum Peak Switch Current
to 5.5V input voltage range makes the LTC3410-1.875 ■
2.5V to 5.5V Input Voltage Range
ideally suited for single Li-Ion battery-powered applica- ■
2.25MHz Constant Frequency Operation
tions. 100% duty cycle provides low dropout operation, ■
No Schottky Diode Required
extending battery life in portable systems. ■
Stable with Ceramic Capacitors
Switching frequency is internally set at 2.25MHz, allowing ■ Shutdown Mode Draws < 1µA Supply Current the use of small surface mount inductors and capacitors. ■ ±2% Output Voltage Accuracy The LTC3410-1.875 is specifically designed to work well ■ Current Mode Operation for Excellent Line and Load Transient Response with ceramic output capacitors, achieving very low output ■ Overtemperature Protected voltage ripple and a small PCB footprint. ■ Available in Low Profile SC70 Package The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The
U
LTC3410-1.875 is available in a tiny, low profile SC70
APPLICATIO S
package. ■ Cellular Telephones , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ Wireless and DSL Modems All other trademarks are the property of their respective owners. Protected by U.S. Patents, ■ Digital Cameras including 5481178, 5994885, 6127815, 6304066, 6498466, 6580258, 6611131. ■ MP3 Players ■ Portable Instruments
U TYPICAL APPLICATIO Efficiency and Power Loss vs Output Current
100 1 2.7V 90 EFFICIENCY V V IN 4.7µH IN V 2.7V V OUT 80 IN SW 1.875V 4.2V 0.1 TO 5.5V CIN C POWER LOSS (W) 70 4.7µF LTC3410-1.875 OUT 4.7µF 3.6V CER RUN CER 60 3.6V VOUT 50 0.01 GND 40 2.7V EFFICIENCY (%) 30 POWER LOSS 0.001 34101875 TA01 20 VIN 4.2V 10 0 0.0001 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 34101875 TA02 34101875f 1
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 93%
The LTC®3410-1.875 is a high efficiency monolithic syn- ■
Very Low Quiescent Current: Only 26
µ
A
chronous buck regulator using a constant frequency, ■
Low Output Voltage Ripple
current mode architecture. Supply current during opera- ■
300mA Output Current at VIN = 3V
tion is only 26µA, dropping to <1µA in shutdown. The 2.5V ■
380mA Minimum Peak Switch Current
to 5.5V input voltage range makes the LTC3410-1.875 ■
2.5V to 5.5V Input Voltage Range
ideally suited for single Li-Ion battery-powered applica- ■
2.25MHz Constant Frequency Operation
tions. 100% duty cycle provides low dropout operation, ■
No Schottky Diode Required
extending battery life in portable systems. ■
Stable with Ceramic Capacitors
Switching frequency is internally set at 2.25MHz, allowing ■ Shutdown Mode Draws < 1µA Supply Current the use of small surface mount inductors and capacitors. ■ ±2% Output Voltage Accuracy The LTC3410-1.875 is specifically designed to work well ■ Current Mode Operation for Excellent Line and Load Transient Response with ceramic output capacitors, achieving very low output ■ Overtemperature Protected voltage ripple and a small PCB footprint. ■ Available in Low Profile SC70 Package The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The
U
LTC3410-1.875 is available in a tiny, low profile SC70
APPLICATIO S
package. ■ Cellular Telephones , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ Wireless and DSL Modems All other trademarks are the property of their respective owners. Protected by U.S. Patents, ■ Digital Cameras including 5481178, 5994885, 6127815, 6304066, 6498466, 6580258, 6611131. ■ MP3 Players ■ Portable Instruments
U TYPICAL APPLICATIO Efficiency and Power Loss vs Output Current
100 1 2.7V 90 EFFICIENCY V V IN 4.7µH IN V 2.7V V OUT 80 IN SW 1.875V 4.2V 0.1 TO 5.5V CIN C POWER LOSS (W) 70 4.7µF LTC3410-1.875 OUT 4.7µF 3.6V CER RUN CER 60 3.6V VOUT 50 0.01 GND 40 2.7V EFFICIENCY (%) 30 POWER LOSS 0.001 34101875 TA01 20 VIN 4.2V 10 0 0.0001 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 34101875 TA02 34101875f 1