Datasheet LTC3406, LTC3406-1.5, LTC3406-1.8 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| 页数 / 页 | 16 / 1 — FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. Very Low Quiescent … |
| 文件格式/大小 | PDF / 247 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. Very Low Quiescent Current: Only 20. During Operation. 600mA Output Current
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LTC3406 LTC3406-1.5/LTC3406-1.8 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3406 is a high efficiency monolithic synchro- ■
Very Low Quiescent Current: Only 20
µ
A
nous buck regulator using a constant frequency, current
During Operation
mode architecture. The device is available in an adjustable ■
600mA Output Current
version and fixed output voltages of 1.5V and 1.8V. Supply ■
2.5V to 5.5V Input Voltage Range
current during operation is only 20µA and drops to ≤1µA ■
1.5MHz Constant Frequency Operation
in shutdown. The 2.5V to 5.5V input voltage range makes ■
No Schottky Diode Required
the LTC3406 ideally suited for single Li-Ion battery-pow- ■
Low Dropout Operation: 100% Duty Cycle
ered applications. 100% duty cycle provides low dropout ■ 0.6V Reference Allows Low Output Voltages operation, extending battery life in portable systems. ■ Shutdown Mode Draws ≤ 1µA Supply Current Automatic Burst Mode® operation increases efficiency at ■ Current Mode Operation for Excellent Line and light loads, further extending battery life. Load Transient Response ■ Overtemperature Protected Switching frequency is internally set at 1.5MHz, allowing ■ Low Profile (1mm) ThinSOTTM Package the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and
U
eliminates the need for an external Schottky diode. Low
APPLICATIO S
output voltages are easily supported with the 0.6V feed- ■ Cellular Telephones back reference voltage. The LTC3406 is available in a low ■ Personal Information Appliances profile (1mm) ThinSOT package. ■ Wireless and DSL Modems , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Digital Still Cameras Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. ■ MP3 Players Protected by U.S. Patents, including 6580258, 5481178. ■ Portable Instruments
U TYPICAL APPLICATIO
95 VIN = 2.7V 90 85 V 2.2µH* IN 4 3 VOUT 2.7V V VIN = 3.6V IN SW 1.8V TO 5.5V CIN** COUT† 600mA 80 4.7µF 10µF V LTC3406-1.8 IN = 4.2V CER CER 75 1 5 RUN 3406 F01a V EFFICIENCY (%) OUT 70 GND 2 65 VOUT = 1.8V *MURATA LQH32CN2R2M33 60 **TAIYO YUDEN JMK212BJ475MG 0.1 1 10 100 1000 †TAIYO YUDEN JMK316BJ106ML OUTPUT CURRENT (mA) 3406 F01b
Figure 1a. High Efficiency Step-Down Converter Figure 1b. Efficiency vs Load Current
3406fa 1
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3406 is a high efficiency monolithic synchro- ■
Very Low Quiescent Current: Only 20
µ
A
nous buck regulator using a constant frequency, current
During Operation
mode architecture. The device is available in an adjustable ■
600mA Output Current
version and fixed output voltages of 1.5V and 1.8V. Supply ■
2.5V to 5.5V Input Voltage Range
current during operation is only 20µA and drops to ≤1µA ■
1.5MHz Constant Frequency Operation
in shutdown. The 2.5V to 5.5V input voltage range makes ■
No Schottky Diode Required
the LTC3406 ideally suited for single Li-Ion battery-pow- ■
Low Dropout Operation: 100% Duty Cycle
ered applications. 100% duty cycle provides low dropout ■ 0.6V Reference Allows Low Output Voltages operation, extending battery life in portable systems. ■ Shutdown Mode Draws ≤ 1µA Supply Current Automatic Burst Mode® operation increases efficiency at ■ Current Mode Operation for Excellent Line and light loads, further extending battery life. Load Transient Response ■ Overtemperature Protected Switching frequency is internally set at 1.5MHz, allowing ■ Low Profile (1mm) ThinSOTTM Package the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and
U
eliminates the need for an external Schottky diode. Low
APPLICATIO S
output voltages are easily supported with the 0.6V feed- ■ Cellular Telephones back reference voltage. The LTC3406 is available in a low ■ Personal Information Appliances profile (1mm) ThinSOT package. ■ Wireless and DSL Modems , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Digital Still Cameras Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. ■ MP3 Players Protected by U.S. Patents, including 6580258, 5481178. ■ Portable Instruments
U TYPICAL APPLICATIO
95 VIN = 2.7V 90 85 V 2.2µH* IN 4 3 VOUT 2.7V V VIN = 3.6V IN SW 1.8V TO 5.5V CIN** COUT† 600mA 80 4.7µF 10µF V LTC3406-1.8 IN = 4.2V CER CER 75 1 5 RUN 3406 F01a V EFFICIENCY (%) OUT 70 GND 2 65 VOUT = 1.8V *MURATA LQH32CN2R2M33 60 **TAIYO YUDEN JMK212BJ475MG 0.1 1 10 100 1000 †TAIYO YUDEN JMK316BJ106ML OUTPUT CURRENT (mA) 3406 F01b
Figure 1a. High Efficiency Step-Down Converter Figure 1b. Efficiency vs Load Current
3406fa 1