LESHAN RADIO COMPANY, LTD.
L6401 Series
HIGH SPEED
LOW DROPOUT
MIDDLE CURRENT VOLTAGE REGULATORS
Dual 300mA High Speed Low Dropout CMOS Voltage Regulators
DESCRIPTION
The L6401 series are highly accurate, Dual , low noise, CMOS LDO voltage regulators.
Performance features of the series includes low output noise, high ripple rejection ratio, low dropout and
very fast turn-on times.
The L6401 includes a reference voltage source, error amplifiers, driver transistors, current limiters
and phase compensators internally. The L6401’s current limiter’s foldback circuit also operates as a
short protect for the output current limiter. The output voltage for each regulator is set independently by
laser trimming. Voltages are selectable in 50mV steps within a range of 1.3V to 5.0V.
The EN function allows the output of each regulator to be turned off independently, resulting in
greatly reduced power consumption. The L6401 series is available in the SOT-26 and USP-6B.
FEATURES
Output Voltage Range
Highly Accurate
Dropout Voltage
High Ripple Rejection
Low Power Consumption
Maximum Output Current
Standby Current
Internal protector
Small packages
1.3V to 6.0V (selectable in 50mV steps)
± 2%
200mV @ 100mA (3.0V type)
70dB (1 kHz)
25μA (TYP.)
300mA
less than 0.1μA
current limiter and short protector
SOT-26 and other required
APPLICATIONS
Mobile phones
Portable games
Cordless phones and radio communication
Portable AV equipment
equipment
PDAs
Cameras, Video cameras
PACKAGE
SOT-26
USP-6B
BLOCK DIAGRAM
EN1
ON/OFF
Control
+
Error
Amp1
Current
Limit
V OUT1
VR1
each
circuit
R11
R12
VIN
V SS
+
Error
Amp2
Current
Limit
V OUT2
VR2
each
circuit
R21
Voltage
Reference
EN2
ON/OFF
Control
R22
1/7