Features and Benefits
- Low Output Noise: 90µVRMS (100kHz BW)
- Low Profile (1mm) ThinSOT™ Package
- Fixed Output Voltage: 5V
- Input Voltage Range: 2.7V to 4.4V
- Uses Small Ceramic Capacitors
- No Inductors Required
- Output Current Up to 30mA
- 550kHz Switching Frequency
- Low Operating Current: 190µA
- Low Shutdown Current: 4µA
- Internal Thermal Shutdown and Current Limiting
The LTC1928-5 is a doubler charge pump with an internal low noise, low dropout (LDO) linear regulator. The part is designed to provide a low noise boosted supply voltage for powering noise sensitive devices such as high frequency VCOs in wireless applications
An internal charge pump converts a 2.7V to 4.4V input to a boosted output, while the internal LDO regulator converts the boosted voltage to a low noise regulated output. The regulator is capable of supplying up to 30mA of output current. Shutdown reduces the supply current to <8µA, removes the load from VIN by disabling the regulator and discharges VOUT to ground through a 200Ω switch.
The LTC1928-5 LDO regulator is stable with only 2µF on the output. Small ceramic capacitors can be used, reducing PC board area.
The LTC1928-5 is short-circuit and overtemperature protected. The part is available in a 6-pin low profile (1mm) ThinSOT package.
- VCO Power Supplies for Cellular Phones
- 2-Way Pagers
- Wireless PCMCIA Cards
- Portable Medical Instruments
- Low Power Data Acquisition
- Remote Transmitters
- White LED Driver
- GaAs Switches
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Tools & Simulations
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Sample & Buy
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