Datasheet LTC1844 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 150mA, Micropower, Low Noise, VLDO Linear Regulator |
| Páginas / Página | 12 / 1 — FEATURES. DESCRIPTIO. Very Low Dropout:. 90mV at 150mA. 30mV at 50mA … |
| Formato / tamaño de archivo | PDF / 213 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. Very Low Dropout:. 90mV at 150mA. 30mV at 50mA (LTC1844-3.3). Wide Input Voltage Range: 1.6V to 6.5V. Low 35
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Versión de texto del documento
LTC1844 Series 150mA, Micropower, Low Noise, VLDO Linear Regulator
U FEATURES DESCRIPTIO
■
Very Low Dropout:
The LTC®1844 Series are low noise VLDOTM (very low
90mV at 150mA
dropout) linear regulators designed for low power/portable
30mV at 50mA (LTC1844-3.3)
applications. These regulators can operate from input ■
Wide Input Voltage Range: 1.6V to 6.5V
voltages as low as 1.6V. Typical output noise is only ■
Low 35
µ
A Supply Current, Even in Dropout
30µVRMS and typical dropout for the LTC1844-3.3 is just ■
Low Noise: 60
µ
VRMS (10Hz to 100kHz)
90mV at the maximum load current of 150mA, reducing to ■ ±
1.75% Voltage Accuracy Over Temperature,
30mV at 50mA.
Voltage and Current Ranges
The internal P-channel MOSFET pass transistor requires ■ Fast Transient Response no base current, allowing the device to draw only 35µA ■ 10nA Supply Current in Shutdown during normal operation, independent of the dropout ■ Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V voltage and load current. The quiescent current falls to a ■ Adjustable Output Voltage: 1.25V to 6V negligible 10nA during shutdown. ■ Output Current Limit ■ Reverse-Battery and Reverse-Current Protection Other features include high output voltage accuracy, ■ No Protection Diodes Needed excellent transient response, stability with ultralow ESR ■ Stable with 1µF Output Capacitor ceramic capacitors as small as 1µF, reverse-battery and ■ Stable with Ceramic Capacitors reverse-current protection, short-circuit and thermal ■ Short-Circuit and Thermal Overload Protection overload protection and output current limiting. ■ Low Profile (1mm) SOT-23 Package The LTC1844 regulators are available in a low profile
U
(1mm) SOT-23 (ThinSOTTM) package.
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation. ■ Portable Instruments and Battery-Powered Systems VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Bluetooth/802.11 Cards ■ Cellular Phones ■ PDAs and Notebook Computers
U TYPICAL APPLICATIO LTC1844-3.3 Dropout Voltage vs Load Current
120
Fixed Voltage Low Noise, VLDO Linear Regulator
100 VIN IN OUT VOUT 3.3V TO 6.5V 3.3V 80 1µF 1µF LTC1844-3.3 60 OFF ON SHDN BYP GND 0.1µF 40 DROPOUT VOLTAGE (mV) 1844 TA01 20 0 0 25 50 75 100 125 150 IOUT (mA) 1844 TA02 1844fa 1
U FEATURES DESCRIPTIO
■
Very Low Dropout:
The LTC®1844 Series are low noise VLDOTM (very low
90mV at 150mA
dropout) linear regulators designed for low power/portable
30mV at 50mA (LTC1844-3.3)
applications. These regulators can operate from input ■
Wide Input Voltage Range: 1.6V to 6.5V
voltages as low as 1.6V. Typical output noise is only ■
Low 35
µ
A Supply Current, Even in Dropout
30µVRMS and typical dropout for the LTC1844-3.3 is just ■
Low Noise: 60
µ
VRMS (10Hz to 100kHz)
90mV at the maximum load current of 150mA, reducing to ■ ±
1.75% Voltage Accuracy Over Temperature,
30mV at 50mA.
Voltage and Current Ranges
The internal P-channel MOSFET pass transistor requires ■ Fast Transient Response no base current, allowing the device to draw only 35µA ■ 10nA Supply Current in Shutdown during normal operation, independent of the dropout ■ Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V voltage and load current. The quiescent current falls to a ■ Adjustable Output Voltage: 1.25V to 6V negligible 10nA during shutdown. ■ Output Current Limit ■ Reverse-Battery and Reverse-Current Protection Other features include high output voltage accuracy, ■ No Protection Diodes Needed excellent transient response, stability with ultralow ESR ■ Stable with 1µF Output Capacitor ceramic capacitors as small as 1µF, reverse-battery and ■ Stable with Ceramic Capacitors reverse-current protection, short-circuit and thermal ■ Short-Circuit and Thermal Overload Protection overload protection and output current limiting. ■ Low Profile (1mm) SOT-23 Package The LTC1844 regulators are available in a low profile
U
(1mm) SOT-23 (ThinSOTTM) package.
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation. ■ Portable Instruments and Battery-Powered Systems VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Bluetooth/802.11 Cards ■ Cellular Phones ■ PDAs and Notebook Computers
U TYPICAL APPLICATIO LTC1844-3.3 Dropout Voltage vs Load Current
120
Fixed Voltage Low Noise, VLDO Linear Regulator
100 VIN IN OUT VOUT 3.3V TO 6.5V 3.3V 80 1µF 1µF LTC1844-3.3 60 OFF ON SHDN BYP GND 0.1µF 40 DROPOUT VOLTAGE (mV) 1844 TA01 20 0 0 25 50 75 100 125 150 IOUT (mA) 1844 TA02 1844fa 1