Datasheet LTC3406B-1.2 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| Seiten / Seite | 12 / 1 — FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. 600mA Output Current at … |
| Dateiformat / Größe | PDF / 276 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. 600mA Output Current at VIN = 3V. 2.5V to 5.5V Input Voltage Range
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LTC3406B-1.2 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3406B-1.2 is a high efficiency monolithic syn- ■
600mA Output Current at VIN = 3V
chronous buck regulator using a constant frequency, ■
2.5V to 5.5V Input Voltage Range
current mode architecture. Supply current with no load is ■
1.5MHz Constant Frequency Operation
300µA dropping to <1µA in shutdown. The 2.5V to 5.5V ■
No Schottky Diode Required
input voltage range makes the LTC3406B-1.2 ideally suited ■ Low Quiescent Current: 300µA for single Li-Ion battery-powered applications. 100% duty ■ Shutdown Mode Draws < 1µA Supply Current cycle provides low dropout operation, extending battery ■ Current Mode Operation for Excellent Line and life in portable systems. PWM pulse skipping mode opera- Load Transient Response tion provides very low output ripple voltage for noise ■ Overtemperature Protected sensitive applications. ■ Low Profile (1mm) ThinSOTTM Package Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors.
U APPLICATIO S
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The ■ Cellular Telephones LTC3406B-1.2 is available in a low profile (1mm) ThinSOT ■ Personal Information Appliances package. ■ Wireless and DSL Modems , LTC and LT are registered trademarks of Linear Technology Corporation. All other ■ trademarks are the property of their respective owners. ThinSOT is a trademark of Linear Digital Still Cameras Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066, ■ MP3 Players 6127815, 6498466, 6611131. ■ Portable Instruments
U TYPICAL APPLICATIO Efficiency and Power Loss High Efficiency Step-Down Converter
100 1 90 2.2µH VIN V V EFFICIENCY IN SW OUT 80 2.7V TO 5.5V 0.1 CIN COUT 1.2V POWER LOSS (W) 4.7µF 10µF 600mA 70 LTC3406B-1.2 CER CER 60 RUN V 0.01 OUT 3406B12 TA01a 50 GND POWER LOSS EFFICIENCY (%) 40 0.001 30 VIN = 2.7V 20 VIN = 3.6V VIN = 4.2V 10 0.0001 0.1 1 10 100 1000 LOAD CURRENT (mA) 3406B12 TA01b sn3406b12 3406b12fs 1
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3406B-1.2 is a high efficiency monolithic syn- ■
600mA Output Current at VIN = 3V
chronous buck regulator using a constant frequency, ■
2.5V to 5.5V Input Voltage Range
current mode architecture. Supply current with no load is ■
1.5MHz Constant Frequency Operation
300µA dropping to <1µA in shutdown. The 2.5V to 5.5V ■
No Schottky Diode Required
input voltage range makes the LTC3406B-1.2 ideally suited ■ Low Quiescent Current: 300µA for single Li-Ion battery-powered applications. 100% duty ■ Shutdown Mode Draws < 1µA Supply Current cycle provides low dropout operation, extending battery ■ Current Mode Operation for Excellent Line and life in portable systems. PWM pulse skipping mode opera- Load Transient Response tion provides very low output ripple voltage for noise ■ Overtemperature Protected sensitive applications. ■ Low Profile (1mm) ThinSOTTM Package Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors.
U APPLICATIO S
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The ■ Cellular Telephones LTC3406B-1.2 is available in a low profile (1mm) ThinSOT ■ Personal Information Appliances package. ■ Wireless and DSL Modems , LTC and LT are registered trademarks of Linear Technology Corporation. All other ■ trademarks are the property of their respective owners. ThinSOT is a trademark of Linear Digital Still Cameras Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066, ■ MP3 Players 6127815, 6498466, 6611131. ■ Portable Instruments
U TYPICAL APPLICATIO Efficiency and Power Loss High Efficiency Step-Down Converter
100 1 90 2.2µH VIN V V EFFICIENCY IN SW OUT 80 2.7V TO 5.5V 0.1 CIN COUT 1.2V POWER LOSS (W) 4.7µF 10µF 600mA 70 LTC3406B-1.2 CER CER 60 RUN V 0.01 OUT 3406B12 TA01a 50 GND POWER LOSS EFFICIENCY (%) 40 0.001 30 VIN = 2.7V 20 VIN = 3.6V VIN = 4.2V 10 0.0001 0.1 1 10 100 1000 LOAD CURRENT (mA) 3406B12 TA01b sn3406b12 3406b12fs 1