LTC3407-4 - Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator
The LTC®3407-4 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A 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 noise ripple for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while Pulse Skip Mode provides low noise ripple 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.
The LTC3407-4 is identical to the LTC3407-2 except for the reduced power-on reset delay time.
Features- High Efficiency: Up to 95%
- Very Low Quiescent Current: Only 40µA
- 2.25MHz Constant Frequency Operation
- High Switch Current: 1.2A on Each Channel
- 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
- Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages
Typical Application
| Applications- PDAs/Palmtop PCs
- Digital Cameras
- Cellular Phones
- Portable Media Players
- PC Cards
- Wireless and DSL Modems
Packaging
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Order Information
Part Number | Package | Temp | Price(1-99) | Price (1k)* |
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LTC3407EDD-4#PBF | 3x3 DFN-10 | E | $4.21 | $2.95 |
LTC3407EDD-4#TRPBF | 3x3 DFN-10 | E | | $3.01 |
LTC3407EMSE-4#PBF | MS-10E | E | $4.21 | $2.95 |
LTC3407EMSE-4#TRPBF | MS-10E | E | | $3.01 |
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