LTC3407A-2 - Dual Synchronous 800mA, 2.25MHz Step-Down DC/DC Regulator
The LTC3407A-2 is a dual, constant frequency, synchronous step-down DC/DC converter. Intended for low power applications, it operates from a 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, enabling the use of tiny, low cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1A power switches provide high efficiency without the need for external Schottky diodes. A user selectable mode input is provided to allow the user to trade-off ripple noise for low power efficiency. Burst Mode operation provides the highest efficiency at light loads, while Pulse Skip Mode provides the lowest ripple noise at light loads. To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40µA. In shutdown, the device draws <1µA.
Features- High Efficiency: Up to 95%
- Low Ripple (<35mVPK-PK) Burst Mode Operation;
IQ = 40µA
- 2.25MHz Constant Frequency Operation
- No Schottky Diodes Required
- Low RDS(ON) Internal Switches: 0.35Ω
- Current Mode Operation for Excellent Line and Load Transient Response
- Short-Circuit Protected
- Low Dropout Operation: 100% Duty Cycle
- Ultralow Shutdown Current: IQ <1µA
- Output Voltages from 5V down to 0.6V
- Power-On Reset Output
- Externally Synchronizable Oscillator
- Optional External Soft-Start
- Small Thermally Enhanced MSOP and 3mm x 3mm DFN Packages
Typical Application
| Applications- PDAs/Palmtop PCs
- Digital Cameras
- Cellular Phones
- Wireless and DSL Modems
Packaging
|
Order Information
Part Number | Package | Temp | Price(1-99) | Price (1k)* |
---|
LTC3407AEDD-2#PBF | 3x3 DFN-10 | E | $4.21 | $2.95 |
LTC3407AEDD-2#TRPBF | 3x3 DFN-10 | E | | $3.01 |
LTC3407AEMSE-2#PBF | MS-10E | E | $4.21 | $2.95 |
LTC3407AEMSE-2#TRPBF | MS-10E | E | | $3.01 |
LTC3407AIDD-2#PBF | 3x3 DFN-10 | I | $4.84 | $3.39 |
LTC3407AIDD-2#TRPBF | 3x3 DFN-10 | I | | $3.45 |
LTC3407AIMSE-2#PBF | MS-10E | I | $4.84 | $3.39 |
LTC3407AIMSE-2#TRPBF | MS-10E | I | | $3.45 |
DatasheetReliability Data | Related Product- LT3757 - Boost, Flyback, SEPIC and Inverting Controller
- LTC3407A - Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator
- LTC6655 - 0.25ppm Noise, Low Drift Precision References
- LTC4359 - Ideal Diode Controller with Reverse Input Protection
- LTC3375 - 8-Channel Programmable, Parallelable 1A Buck DC/DCs
- LT3748 - 100V Isolated Flyback Controller
- LTC3891 - Low IQ, 60V Synchronous Step-Down Controller
- LTC4364 - Surge Stopper with Ideal Diode
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LT3060 - 45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator
|