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News
Dual Input, 2.5A Synchronous Step-Down DC/DC Converter Delivers 95% Efficiency from 2.4V to 42V Inputs with Lossless PowerPath Control
2016-10-04 | ReturnThe LTC3126’s integrated lossless PowerPath circuitry supports seamless operation from two separate input power sources. Pin-selectable ideal diode-OR and priority input modes with user-programmable undervoltage lockout thresholds provide full control over the transition between the input power sources. The fast, automatic switchover provided by this internal PowerPath eliminates the need for hold-up capacitors and minimizes disturbances on the output rail. An active input channel indicator and independent input and output power good signals provide complete feedback of the power system status. Other features include 1μA current in shutdown, internal soft-start and thermal protection.
The LTC3126 is housed in thermally enhanced 28-lead TSSOP and 4mm x 5mm QFN packages. These packages, when combined with the device’s high switching frequency that enables small external inductors and capacitors, provide a compact, thermally efficient footprint. E-and I-grade devices both feature an operating junction temperature of –40°C to 125°C. The H-grade high reliability version is offered in TSSOP only and is tested and guaranteed to operate from –40°C to 150°C operating junction temperature. Pricing starts at $6.25 each in 1000-piece quantities. All versions are available from stock. For more information, visit www.linear.com/product/LTC3126.
Summary of Features: LTC3126
1. Seamless, Automatic Transition Between Two Input Power Sources
2. Wide Input Voltage Range: 2.4V to 42V
3. Wide Output Voltage Range: 0.818V to VIN
4. Up to 2.5A Continuous Output Current
5. Pin-Selectable Priority & Ideal Diode-OR Modes
6. Burst Mode® Operation, IQ = 2μA
7. 95% Efficiency at 1A, VIN = 12V, VOUT = 5V
8. 1μA Current in Shutdown
9. Programmable Input UVLO Thresholds
10. Input Valid, Priority Channel & PGOOD Indicators
11. 200kHz to 2.2MHz Fixed Frequency PWM
12. Synchronizable to an External Clock
13. Current Mode Control with 60ns Minimum On-Time
14. Minimal External Components
15. Thermally Enhanced 28-Lead 4mm × 5mm QFN & 28-Lead TSSOP Packages
Pricing shown is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.
Source:http://www.linear.com/