1

LTC1844 Series

1844fa

150mA, Micropower,

Low Noise, VLDO

Linear Regulator

■

Very Low Dropout:

90mV at 150mA

30mV at 50mA (LTC1844-3.3)

■

Wide Input Voltage Range: 1.6V to 6.5V

µA Supply Current, Even in Dropout

■

±1.75% Voltage Accuracy Over Temperature,

Voltage and Current Ranges

■

10nA Supply Current in Shutdown

■

Output Current Limit

■

Stable with 1

µF Output Capacitor

Fixed Voltage Low Noise, VLDO Linear Regulator

■

Cellular Phones

The LTC

dropout) linear regulators designed for low power/portable

applications. These regulators can operate from input

voltages as low as 1.6V. Typical output noise is only

30

90mV at the maximum load current of 150mA, reducing to

30mV at 50mA.

The internal P-channel MOSFET pass transistor requires

no base current, allowing the device to draw only 35

µA

during normal operation, independent of the dropout

voltage and load current. The quiescent current falls to a

negligible 10nA during shutdown.

Other features include high output voltage accuracy,

excellent transient response, stability with ultralow ESR

ceramic capacitors as small as 1

µF, reverse-battery and

reverse-current protection, short-circuit and thermal

overload protection and output current limiting.

The LTC1844 regulators are available in a low profile

(1mm) SOT-23 (ThinSOT

IN

SHDN

1844 TA01

1

µF

LTC1844-3.3

OUT

3.3V

3.3V TO 6.5V

BYP

GND

0.1

µF

1

µF

OFF ON

LTC1844-3.3 Dropout Voltage vs Load Current

0

0

20

40

60

80

120

100

25

50

75

100

1844 TA02

125

150

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation.

VLDO and ThinSOT are trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.