Datasheet LTC3406A (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| Seiten / Seite | 16 / 1 — FEATURES. DESCRIPTION. High Effi ciency: Up to 96%. Very Low Quiescent … |
| Dateiformat / Größe | PDF / 305 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. High Effi ciency: Up to 96%. Very Low Quiescent Current: Only 20µA
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LTC3406A 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
FEATURES DESCRIPTION
■
High Effi ciency: Up to 96%
The LTC®3406A is a high effi ciency monolithic synchro- ■
Very Low Quiescent Current: Only 20µA
nous buck regulator using a constant frequency, current ■
Low Output Ripple Voltage During Burst Mode®
mode architecture. Supply current during operation is only
Operation
20μA, dropping to ≤1μA in shutdown. The 2.5V to 5.5V ■
600mA Output Current
input voltage range makes the LTC3406A ideally suited ■
2.5V to 5.5V Input Voltage Range
for single Li-Ion battery-powered applications. 100% duty ■
1.5MHz Constant Frequency Operation
cycle provides low dropout operation, extending battery ■
No Schottky Diode Required
runtime portable systems. Automatic Burst Mode opera- ■
Low Dropout Operation: 100% Duty Cycle
tion increases effi ciency at light loads, further extending ■ ±2% 0.6V Reference battery runtime. ■ Shutdown Mode Draw ≤1µA Supply Current Switching frequency is internally set at 1.5MHz, allowing ■ Internal Soft-Start Limits Inrush Current the use of small surface mount inductors and capacitors. ■ Current Mode Operation for Excellent Line and The internal synchronous switch increases effi ciency Load Transient Response and eliminates the need for an external Schottky diode. ■ Overtemperature Protected Low output voltages are easily supported with the 0.6V ■ Low Profi le (1mm) ThinSOTTM Package feedback reference voltage. The LTC3406A is available in
APPLICATIONS
a low profi le (1mm) ThinSOT package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ Cellular Telephones ThinSOT is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Wireless and DSL Modems Protected by U.S. Patents including 5481178, 6580258. ■ Digital Still Cameras ■ Media Players ■ Portable Instruments ■ Point of Load Regulation
TYPICAL APPLICATION Effi ciency vs Load Current
100 2.2μH V 90 OUT VIN VIN SW 1.8V 80 22pF 4.7μF 600mA CER LTC3406A 10μF 70 CER 60 RUN VFB 50 619k GND 309k 40 EFFICIENCY (%) 30 3406A TA01 20 VIN = 2.7V 10 VIN = 3.6V V V OUT = 1.8V IN = 4.2V 0 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 3406A TA01b 3406afa 1
FEATURES DESCRIPTION
■
High Effi ciency: Up to 96%
The LTC®3406A is a high effi ciency monolithic synchro- ■
Very Low Quiescent Current: Only 20µA
nous buck regulator using a constant frequency, current ■
Low Output Ripple Voltage During Burst Mode®
mode architecture. Supply current during operation is only
Operation
20μA, dropping to ≤1μA in shutdown. The 2.5V to 5.5V ■
600mA Output Current
input voltage range makes the LTC3406A ideally suited ■
2.5V to 5.5V Input Voltage Range
for single Li-Ion battery-powered applications. 100% duty ■
1.5MHz Constant Frequency Operation
cycle provides low dropout operation, extending battery ■
No Schottky Diode Required
runtime portable systems. Automatic Burst Mode opera- ■
Low Dropout Operation: 100% Duty Cycle
tion increases effi ciency at light loads, further extending ■ ±2% 0.6V Reference battery runtime. ■ Shutdown Mode Draw ≤1µA Supply Current Switching frequency is internally set at 1.5MHz, allowing ■ Internal Soft-Start Limits Inrush Current the use of small surface mount inductors and capacitors. ■ Current Mode Operation for Excellent Line and The internal synchronous switch increases effi ciency Load Transient Response and eliminates the need for an external Schottky diode. ■ Overtemperature Protected Low output voltages are easily supported with the 0.6V ■ Low Profi le (1mm) ThinSOTTM Package feedback reference voltage. The LTC3406A is available in
APPLICATIONS
a low profi le (1mm) ThinSOT package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ Cellular Telephones ThinSOT is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Wireless and DSL Modems Protected by U.S. Patents including 5481178, 6580258. ■ Digital Still Cameras ■ Media Players ■ Portable Instruments ■ Point of Load Regulation
TYPICAL APPLICATION Effi ciency vs Load Current
100 2.2μH V 90 OUT VIN VIN SW 1.8V 80 22pF 4.7μF 600mA CER LTC3406A 10μF 70 CER 60 RUN VFB 50 619k GND 309k 40 EFFICIENCY (%) 30 3406A TA01 20 VIN = 2.7V 10 VIN = 3.6V V V OUT = 1.8V IN = 4.2V 0 0.1 1 10 100 1000 OUTPUT CURRENT (mA) 3406A TA01b 3406afa 1