Datasheet LTC3406AB-2 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| Seiten / Seite | 18 / 1 — FeaTures. DescripTion. High Efficiency: Up to 96%. 600mA Output Current. … |
| Dateiformat / Größe | PDF / 359 Kb |
| Dokumentensprache | Englisch |
FeaTures. DescripTion. High Efficiency: Up to 96%. 600mA Output Current. 2.5V to 5.5V Input Voltage Range
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LTC3406AB-2 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
FeaTures DescripTion
n
High Efficiency: Up to 96%
The LTC®3406AB-2 is a high efficiency monolithic synchro- n
600mA Output Current
nous buck regulator using a constant frequency, current n
2.5V to 5.5V Input Voltage Range
mode architecture. Supply current with no load is 200µA n
2.25MHz Constant Frequency Operation
and drops to <1µA in shutdown. The 2.5V to 5.5V input n
No Schottky Diode Required
voltage range makes the LTC3406AB-2 ideally suited for n
Low Dropout Operation: 100% Duty Cycle
single Li-Ion battery-powered applications. 100% duty n
±2% Output Voltage Accuracy
cycle provides low dropout operation, extending battery n Low Quiescent Current: 200µA life in portable systems. PWM pulse skipping mode op- n 0.6V Reference Allows Low Output Voltages eration provides very low output ripple voltage for noise n Shutdown Mode Draws <1µA Supply Current sensitive applications. n Internal Soft-Start Limits Inrush Current Switching frequency is internally set at 2.25MHz, allowing n Current Mode Operation for Excellent Line and the use of small surface mount inductors and capacitors. Load Transient Response n The internal synchronous switch increases efficiency and Overtemperature Protected n eliminates the need for an external Schottky diode. Low Low Profile (1mm) ThinSOTTM Package output voltages are easily supported with the 0.6V feedback
applicaTions
reference voltage. The LTC3406AB-2 is available in a low profile (1mm) ThinSOT package. Refer to LTC3406A for n Cellular Telephones applications that require Burst Mode® operation. n L Personal Navigation Devices , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a registered trademark n Wireless and DSL Modems of Linear Technology Corporation. All other trademarks are the property of their respective n owners. Protected by U.S. Patents including 5481178, 6580258 Digital Still Cameras n Media Players n Portable Instruments
Typical applicaTion Efficiency vs Output Current
100 V 2.2µH* OUT = 1.8V VOUT 90 VIN VIN SW 1.8V C † 22pF 80 IN 600mA 4.7µF LTC3406AB-2 COUT** 70 CER 10µF CER 60 RUN VFB 619k 50 GND 309k * MURATA LQH32CN2R2M33 40 ** TAIYO YUDEN JMK316BJ106I † EFFICIENCY (%) 3406AB2 TA01a TAIYO YUDEN JMK212BJ475 30 20 VIN = 2.7V 10 VIN = 3.6V VIN = 4.2V 00.1 1 10 100 1000 OUTPUT CURRENT (mA) 3406AB2 TA01b 3406ab2fa For more information www.linear.com/LTC3406AB-2 1
FeaTures DescripTion
n
High Efficiency: Up to 96%
The LTC®3406AB-2 is a high efficiency monolithic synchro- n
600mA Output Current
nous buck regulator using a constant frequency, current n
2.5V to 5.5V Input Voltage Range
mode architecture. Supply current with no load is 200µA n
2.25MHz Constant Frequency Operation
and drops to <1µA in shutdown. The 2.5V to 5.5V input n
No Schottky Diode Required
voltage range makes the LTC3406AB-2 ideally suited for n
Low Dropout Operation: 100% Duty Cycle
single Li-Ion battery-powered applications. 100% duty n
±2% Output Voltage Accuracy
cycle provides low dropout operation, extending battery n Low Quiescent Current: 200µA life in portable systems. PWM pulse skipping mode op- n 0.6V Reference Allows Low Output Voltages eration provides very low output ripple voltage for noise n Shutdown Mode Draws <1µA Supply Current sensitive applications. n Internal Soft-Start Limits Inrush Current Switching frequency is internally set at 2.25MHz, allowing n Current Mode Operation for Excellent Line and the use of small surface mount inductors and capacitors. Load Transient Response n The internal synchronous switch increases efficiency and Overtemperature Protected n eliminates the need for an external Schottky diode. Low Low Profile (1mm) ThinSOTTM Package output voltages are easily supported with the 0.6V feedback
applicaTions
reference voltage. The LTC3406AB-2 is available in a low profile (1mm) ThinSOT package. Refer to LTC3406A for n Cellular Telephones applications that require Burst Mode® operation. n L Personal Navigation Devices , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a registered trademark n Wireless and DSL Modems of Linear Technology Corporation. All other trademarks are the property of their respective n owners. Protected by U.S. Patents including 5481178, 6580258 Digital Still Cameras n Media Players n Portable Instruments
Typical applicaTion Efficiency vs Output Current
100 V 2.2µH* OUT = 1.8V VOUT 90 VIN VIN SW 1.8V C † 22pF 80 IN 600mA 4.7µF LTC3406AB-2 COUT** 70 CER 10µF CER 60 RUN VFB 619k 50 GND 309k * MURATA LQH32CN2R2M33 40 ** TAIYO YUDEN JMK316BJ106I † EFFICIENCY (%) 3406AB2 TA01a TAIYO YUDEN JMK212BJ475 30 20 VIN = 2.7V 10 VIN = 3.6V VIN = 4.2V 00.1 1 10 100 1000 OUTPUT CURRENT (mA) 3406AB2 TA01b 3406ab2fa For more information www.linear.com/LTC3406AB-2 1