Datasheet LTC3410B (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. 300mA Output Current at … |
| Formato / tamaño de archivo | PDF / 297 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. 300mA Output Current at VIN = 3V. 380mA Minimum Peak Switch Current
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LTC3410B 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3410B is a high efficiency monolithic synchro- ■
300mA Output Current at VIN = 3V
nous buck regulator using a constant frequency, current ■
380mA Minimum Peak Switch Current
mode architecture. The device is available in adjustable ■
2.5V to 5.5V Input Voltage Range
and fixed output voltage versions. Supply current during ■
2.25MHz Constant Frequency Operation
operation is only 200µA, dropping to <1µA in shutdown. ■
No Schottky Diode Required
The 2.5V to 5.5V input voltage range makes the LTC3410B ■
Low Dropout Operation: 100% Duty Cycle
ideally suited for single Li-Ion battery-powered applica- ■
Stable with Ceramic Capacitors
tions. 100% duty cycle provides low dropout operation, ■ 0.8V Reference Allows Low Output Voltages extending battery life in portable systems. PWM pulse ■ Shutdown Mode Draws < 1µA Supply Current skipping mode operation provides very low output ripple ■ ±2% Output Voltage Accuracy voltage for noise sensitive applications. ■ Current Mode Operation for Excellent Line and Load Transient Response Switching frequency is internally set at 2.25MHz, allowing ■ Overtemperature Protected the use of small surface mount inductors and capacitors. ■ Available in Low Profile SC70 Package The LTC3410B is specifically designed to work well with ceramic output capacitors, achieving very low output
U
voltage ripple and a small PCB footprint.
APPLICATIO S
The internal synchronous switch increases efficiency and ■ Cellular Telephones eliminates the need for an external Schottky diode. Low ■ Personal Information Appliances output voltages are easily supported with the 0.8V feed- ■ Wireless and DSL Modems back reference voltage. The LTC3410B is available in a ■ Digital Still Cameras tiny, low profile SC70 package. ■ MP3 Players , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All ■ Portable Instruments other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5994885, 6580258, 6304066, 6127815, 6498466, 6611131.
U TYPICAL APPLICATIO Efficiency and Power Loss vs Output Current
100 1 90 EFFICIENCY V 4.7µH IN V 80 2.7V V OUT 0.1 IN SW 1.2V POWER LOSS (W) TO 5.5V C 10pF 70 IN C 2.2µF LTC3410B OUT 2.2µF 60 CER RUN CER 50 0.01 VFB POWER LOSS 232k 40 GND EFFICIENCY (%) 464k 30 0.001 3410 TA01 20 VIN = 2.7V 20 VIN = 3.6V VIN = 4.2V 0.0001 0 1 10 100 1000 OUTPUT CURRENT (mA) 3410 TA01b 3410bfa 1
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3410B is a high efficiency monolithic synchro- ■
300mA Output Current at VIN = 3V
nous buck regulator using a constant frequency, current ■
380mA Minimum Peak Switch Current
mode architecture. The device is available in adjustable ■
2.5V to 5.5V Input Voltage Range
and fixed output voltage versions. Supply current during ■
2.25MHz Constant Frequency Operation
operation is only 200µA, dropping to <1µA in shutdown. ■
No Schottky Diode Required
The 2.5V to 5.5V input voltage range makes the LTC3410B ■
Low Dropout Operation: 100% Duty Cycle
ideally suited for single Li-Ion battery-powered applica- ■
Stable with Ceramic Capacitors
tions. 100% duty cycle provides low dropout operation, ■ 0.8V Reference Allows Low Output Voltages extending battery life in portable systems. PWM pulse ■ Shutdown Mode Draws < 1µA Supply Current skipping mode operation provides very low output ripple ■ ±2% Output Voltage Accuracy voltage for noise sensitive applications. ■ Current Mode Operation for Excellent Line and Load Transient Response Switching frequency is internally set at 2.25MHz, allowing ■ Overtemperature Protected the use of small surface mount inductors and capacitors. ■ Available in Low Profile SC70 Package The LTC3410B is specifically designed to work well with ceramic output capacitors, achieving very low output
U
voltage ripple and a small PCB footprint.
APPLICATIO S
The internal synchronous switch increases efficiency and ■ Cellular Telephones eliminates the need for an external Schottky diode. Low ■ Personal Information Appliances output voltages are easily supported with the 0.8V feed- ■ Wireless and DSL Modems back reference voltage. The LTC3410B is available in a ■ Digital Still Cameras tiny, low profile SC70 package. ■ MP3 Players , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All ■ Portable Instruments other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5994885, 6580258, 6304066, 6127815, 6498466, 6611131.
U TYPICAL APPLICATIO Efficiency and Power Loss vs Output Current
100 1 90 EFFICIENCY V 4.7µH IN V 80 2.7V V OUT 0.1 IN SW 1.2V POWER LOSS (W) TO 5.5V C 10pF 70 IN C 2.2µF LTC3410B OUT 2.2µF 60 CER RUN CER 50 0.01 VFB POWER LOSS 232k 40 GND EFFICIENCY (%) 464k 30 0.001 3410 TA01 20 VIN = 2.7V 20 VIN = 3.6V VIN = 4.2V 0.0001 0 1 10 100 1000 OUTPUT CURRENT (mA) 3410 TA01b 3410bfa 1