Datasheet LTC3564 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 2.25MHz, 1.25A Synchronous Step-Down Regulator |
| 页数 / 页 | 20 / 1 — FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. Very Low Quiescent … |
| 文件格式/大小 | PDF / 269 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. High Efficiency: Up to 96%. Very Low Quiescent Current: Only 20. 1.25A Output Current
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LTC3564 2.25MHz, 1.25A Synchronous Step-Down Regulator
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3564 is a high efficiency monolithic synchro- ■
Very Low Quiescent Current: Only 20
μ
A
nous buck regulator using a constant frequency, current ■
1.25A Output Current
mode architecture. Supply current during operation is ■
2.5V to 5.5V Input Voltage Range
only 20μA, dropping to ≤1μA in shutdown. The 2.5V to ■
2.25MHz Constant Frequency Operation
5.5V input voltage range makes the LTC3564 ideally suited ■
No Schottky Diode Required
for single Li-Ion battery-powered or 3.3V to 5V input ■
Low Dropout Operation: 100% Duty Cycle
voltage applications. 100% duty cycle provides low drop- ■ 0.6V Reference Allows Low Output Voltages out 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 runtime. Load Transient Response Switching frequency is internally set at 2.25MHz, allowing ■ Overtemperature Protected ■ Low Profile (1mm) ThinSOTTM and the use of small surface mount inductors and capacitors. 6-Lead (2mm × 3mm) DFN Packages 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 LTC3564 is available in low ■ Wireless and DSL Modems profile (1mm) ThinSOT and 6-Lead (2mm × 3mm) DFN ■ Digital Still Cameras packages. ■ Media Players , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. ■ Portable Instruments ThinSOT is a trademark of Linear Technology Corporation. ■ Point of Load Regulation All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6498466, 6611131.
U TYPICAL APPLICATIO
100 10 VOUT = 1.8V 90 1 80 POWER LOSS (W) 70 0.1 60 1.1μH 50 V VOUT 0.01 IN VIN SW C 22pF 1.8V IN 40 22μF C LTC3564 OUT EFFICIENCY (%) 0.001 CER 22μF 30 CER RUN V 20 FB VIN = 2.7V 0.0001 634k GND 10 VIN = 3.6V 316k VIN = 4.2V 0 0.00001 3564 TA01a 0.1 1 10 100 1000 10000 OUTPUT CURRENT (mA) 3564 TA01b 3564f 1
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 96%
The LTC®3564 is a high efficiency monolithic synchro- ■
Very Low Quiescent Current: Only 20
μ
A
nous buck regulator using a constant frequency, current ■
1.25A Output Current
mode architecture. Supply current during operation is ■
2.5V to 5.5V Input Voltage Range
only 20μA, dropping to ≤1μA in shutdown. The 2.5V to ■
2.25MHz Constant Frequency Operation
5.5V input voltage range makes the LTC3564 ideally suited ■
No Schottky Diode Required
for single Li-Ion battery-powered or 3.3V to 5V input ■
Low Dropout Operation: 100% Duty Cycle
voltage applications. 100% duty cycle provides low drop- ■ 0.6V Reference Allows Low Output Voltages out 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 runtime. Load Transient Response Switching frequency is internally set at 2.25MHz, allowing ■ Overtemperature Protected ■ Low Profile (1mm) ThinSOTTM and the use of small surface mount inductors and capacitors. 6-Lead (2mm × 3mm) DFN Packages 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 LTC3564 is available in low ■ Wireless and DSL Modems profile (1mm) ThinSOT and 6-Lead (2mm × 3mm) DFN ■ Digital Still Cameras packages. ■ Media Players , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. ■ Portable Instruments ThinSOT is a trademark of Linear Technology Corporation. ■ Point of Load Regulation All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6498466, 6611131.
U TYPICAL APPLICATIO
100 10 VOUT = 1.8V 90 1 80 POWER LOSS (W) 70 0.1 60 1.1μH 50 V VOUT 0.01 IN VIN SW C 22pF 1.8V IN 40 22μF C LTC3564 OUT EFFICIENCY (%) 0.001 CER 22μF 30 CER RUN V 20 FB VIN = 2.7V 0.0001 634k GND 10 VIN = 3.6V 316k VIN = 4.2V 0 0.00001 3564 TA01a 0.1 1 10 100 1000 10000 OUTPUT CURRENT (mA) 3564 TA01b 3564f 1