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LTC1928-5 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1928-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LTC1928-5 , LTC and LT are registered trademarks of Linear Technology Corporation ThinSOT is a trademark of Linear Technology Corporation. FEATURES APPLICATIO S DESCRIPTIO TYPICAL APPLICATION s Low Output Noise: 90 µVRMS (100kHz BW) s Fixed Output Voltage: 5V s Input Voltage Range: 2.7V to 4.4V s No Inductors Required s Uses Small Ceramic Capacitors s Output Current Up to 30mA s 550kHz Switching Frequency s Low Operating Current: 190 µA s Low Shutdown Current: 4 µA s Internal Thermal Shutdown and Current Limiting s Low Profile (1mm) ThinSOT TM Package The LTC ®1928-5 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 con- verts 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 < 8 µA, 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 2 µF on the output. Small ceramic capacitors can be used, reduc- ing PC board area. The LTC1928-5 is short-circuit and overtemperature pro- tected. The part is available in a 6-pin low profile (1mm)ThinSOT package. s VCO Power Supplies for Cellular Phones s 2-Way Pagers s Wireless PCMCIA Cards s Portable Medical Instruments s Low Power Data Acquisition s Remote Transmitters s White LED Drivers s GaAs Switches Figure 1. Low Noise 5V Power Supply Doubler Charge Pump with Low Noise Linear Regulator in ThinSOT Output Noise (BW = 10Hz to 2.5MHz) VOUT 200 µV/DIV CCPO = COUT = 4.7µF 100µs/DIV 19285 TA01 IOUT = 10mA VIN = 3V VOUT = 5V TA = 25°C 1 5 6 3 4 2 VOUT CPO GND VIN 2.7V TO 4.4V VIN CP CN/SHDN 5V 4.7 µF 0.47 µF 4.7 µF 4.7 µF 19285 F01 VOUT LTC1928-5 |
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Similar Description - LTC1928-5 |
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