Datasheet LTC3561A (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 1A, 4MHz, Synchronous Step-Down DC/DC Converter |
| 页数 / 页 | 20 / 1 — FEATURES. DESCRIPTION. Uses Tiny Capacitors and Inductor. High Frequency … |
| 文件格式/大小 | PDF / 364 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Uses Tiny Capacitors and Inductor. High Frequency Operation: Up to 4MHz
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LTC3561A 1A, 4MHz, Synchronous Step-Down DC/DC Converter
FEATURES DESCRIPTION
■
Uses Tiny Capacitors and Inductor
The LTC®3561A is a constant frequency, synchronous ■
High Frequency Operation: Up to 4MHz
step-down DC/DC converter. Intended for medium power ■
Low RDS(ON) Internal Switches: 0.15Ω
applications, it operates from a 2.5V to 5.5V input voltage ■
High Efficiency: Up to 96%
range and has a user configurable operating frequency up ■ Stable with Ceramic Capacitors to 4MHz, allowing the use of tiny, low cost capacitors and ■ Current Mode Operation for Excellent Line inductors 1mm or less in height. The output voltage is and Load Transient Response adjustable from 0.8V to 5.5V. Internal synchronous power ■ Short-Circuit Protected switches provide high efficiency. The LTC3561A’s current ■ Low Dropout Operation: 100% Duty Cycle mode architecture and external compensation allow the ■ Low Shutdown Current: IQ ≤ 1µA transient response to be optimized over a wide range of ■ Low Quiescent Current: 330µA loads and output capacitors. ■ Output Voltages from 0.8V to 5V To further maximize battery life, the P-channel MOSFET ■ VIN: 2.5V to 5.5V is turned on continuously in dropout (100% duty cycle). ■ Small 8-Lead 3mm × 3mm DFN Package In shutdown, the device draws <1µA.
APPLICATIONS
L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including ■ Notebook Computers 5481178, 6580258, 6498466, 6611131. ■ Digital Cameras ■ Cellular Phones ■ Handheld Instruments ■ Board Mounted Power Supplies
TYPICAL APPLICATION Step-Down 2.5V/1A Regulator Efficiency and Power Loss vs Output Current
100 1 VIN PVIN 2.5V TO 5.5V 2.2µH VOUT 90 SV SW IN 2.5V 22pF 1A 10µF 80 22µF 0.1 LTC3561A 70 POWER LOSS (W) ITH 249k 60 SHDN/RT VFB 16.9k 50 0.01 SGND PGND 549k 40 680pF 118k EFFICIENCY (%) 30 VOUT = 2.5V fO = 1MHz 0.001 3561a TA01a 20 VIN = 2.7V 10 VIN = 3.6V VIN = 4.2V 0 0.0001 1 10 100 1000 10000 OUTPUT CURRENT (mA) 3561A TA01b 3561afa For more information www.linear.com/LTC3561A 1
FEATURES DESCRIPTION
■
Uses Tiny Capacitors and Inductor
The LTC®3561A is a constant frequency, synchronous ■
High Frequency Operation: Up to 4MHz
step-down DC/DC converter. Intended for medium power ■
Low RDS(ON) Internal Switches: 0.15Ω
applications, it operates from a 2.5V to 5.5V input voltage ■
High Efficiency: Up to 96%
range and has a user configurable operating frequency up ■ Stable with Ceramic Capacitors to 4MHz, allowing the use of tiny, low cost capacitors and ■ Current Mode Operation for Excellent Line inductors 1mm or less in height. The output voltage is and Load Transient Response adjustable from 0.8V to 5.5V. Internal synchronous power ■ Short-Circuit Protected switches provide high efficiency. The LTC3561A’s current ■ Low Dropout Operation: 100% Duty Cycle mode architecture and external compensation allow the ■ Low Shutdown Current: IQ ≤ 1µA transient response to be optimized over a wide range of ■ Low Quiescent Current: 330µA loads and output capacitors. ■ Output Voltages from 0.8V to 5V To further maximize battery life, the P-channel MOSFET ■ VIN: 2.5V to 5.5V is turned on continuously in dropout (100% duty cycle). ■ Small 8-Lead 3mm × 3mm DFN Package In shutdown, the device draws <1µA.
APPLICATIONS
L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including ■ Notebook Computers 5481178, 6580258, 6498466, 6611131. ■ Digital Cameras ■ Cellular Phones ■ Handheld Instruments ■ Board Mounted Power Supplies
TYPICAL APPLICATION Step-Down 2.5V/1A Regulator Efficiency and Power Loss vs Output Current
100 1 VIN PVIN 2.5V TO 5.5V 2.2µH VOUT 90 SV SW IN 2.5V 22pF 1A 10µF 80 22µF 0.1 LTC3561A 70 POWER LOSS (W) ITH 249k 60 SHDN/RT VFB 16.9k 50 0.01 SGND PGND 549k 40 680pF 118k EFFICIENCY (%) 30 VOUT = 2.5V fO = 1MHz 0.001 3561a TA01a 20 VIN = 2.7V 10 VIN = 3.6V VIN = 4.2V 0 0.0001 1 10 100 1000 10000 OUTPUT CURRENT (mA) 3561A TA01b 3561afa For more information www.linear.com/LTC3561A 1