LESHAN RADIO COMPANY, LTD.
HIGH SPEED
LOW DROPOUT
MIDDLE CURRENT VOLTAGE REGULATORS
Dual 300mA High Speed Low Dropout CMOS Voltage Regulators
L6401 Series
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
Portable games
Portable AV equipment
APPLICATIONS
Mobile phones
Cordless phones and radio communication
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
V
IN
V
SS
-
+
VR2
each
circuit
Voltage
Reference
Error
Amp2
Current
Limit
V
OUT2
R21
EN2
ON/OFF
Control
R22
1/7
LESHAN RADIO COMPANY, LTD.
L6401 Series
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
Output Voltage
Output Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
SYMBOL
V
IN
V
EN
V
OUT
I
OUT1
+I
OUT2
P
D
Topr
Tstg
SOT-26
USP-6B
-40½+85
-40½+125
MAXIMUM RATING
V
SS
-0.3½V
SS
+10
V
SS
-0.3½V
IN
+0.3
V
SS
-0.3½V
IN
+0.3
700
250
100
°C
mA
mW
V
UNIT
Caution:
The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
Electrical Characteristics
Parameter
Output Voltage
Output Current
Dropout Voltage
Symbol
V
OUT(E)
I
OUT
V
drop
CONDITION
V
IN
=V
OUT(S)
+1.0 V, I
OUT
=30
mA
V
IN
≥V
OUT(S)
+1.0 V
I
OUT
=50 mA
I
OUT
=100 mA
V
OUT(S)
+0.5 V
≤V
IN
≤8
V
I
OUT
=30 mA
V
IN
=V
OUT(S)
+1.0 V
1.0 mA
≤I
OUT
≤100
mA
V
IN
=V
OUT(S)
+1.0 V, I
OUT
=10
mA
-40°C
≤
Ta
≤85°C
V
IN
=V
OUT(S)
+1.0 V
V
IN
=V
EN
=V
OUT(T)
+1V
，
V
EN
=VSS
——
V
IN
=V
OUT(S)
+1.0 V，f=1 kHz
Vrip=0.5 Vrms, I
OUT
=30 mA
V
IN
=V
OUT(S)
+1.0 V,
V
IN
=V
EN
V
IN
=V
EN
=V
OUT(T)
+1V
MIN
V
OUT(S)
×0.98
300
—
—
—
TYP
V
OUT(S)
—
0.06
0.20
0.01
15
MAX
V
OUT(S)
×1.02
—
0.10
0.30
0.2
50
UNIT
V
mA
V
CIRCUIT
1
1
Line Regulations
Δ
V
OUT
1
Δ
V
IN
•
V
OUT
%/V
1
mV
Load Regulation
Output Voltage
Temperature
Characteristics
Supply Current
Standby Current
Input Voltage
Ripple-Rejection
Short-circuit
Current
Current limiter
CE “High” Voltage
CE “Low” Voltage
CE “High” Current
CE “Low” Current
Δ
V
OUT
2
Δ
V
OUT
Δ
Ta
•
V
OUT
I
SS1
I
STB
V
IN
|PSRR|
Ishort
Ilim
V
CEH
V
CEL
I
CEH
I
CEH
—
—
±100
25
0.01
—
70
30
450
—
40
0.1
10
—
ppm/℃
μA
μA
V
dB
mA
mA
V
V
uA
uA
2
3
—
5
1
1
2
2
2
2
—
—
2.0
—
—
—
1.3
—
—
VIN
0.25
0.1
0.1
V
IN
=V
EN
=V
OUT(T)
+1V
V
IN
=V
EN
=V
OUT(T)
+1V
，
V
EN
=VSS
-0.1
-0.1
2/7
LESHAN RADIO COMPANY, LTD.
L6401 Series
TEST CIRCUITS
Circuit
①
CIN, CL1, CL2 : 1μF(ceramic)
V
IN
EN1
V
OUT1
Circuit
②
A
CL1
I
OUT1
RL1
V
CIN
V
EN2
V
OUT2
A
CL2
I
OUT2
RL2
V
SS
V
Circuit
③
Circuit
④
Circuit
⑤
TYPICAL APPLICATION CIRCUIT
Basic circuit
●SOT-26W
EN1
V
OUT1
6
1
2
●USP-6
1
C
L1
1uF
EN2 V
OUT2
V
IN
V
OUT1
EN1 V
SS
6
5
4
C
L1
1uF
C
L2
1uF
2
C
IN
1uF
3
V
IN
EN2
V
SS
V
OUT2
5
C
IN
1uF
4
3
C
L2
1uF
Caution
:
The above connection diagram and constant will not guarantee successful operation. Perform thorough
evaluation using the actual application to set the constant.
Application Conditions
Input capacitor (CIN): 1.0µF or more
Output capacitor (CL): 1.0 µF or more
(tantalum capacitor)
Caution A general series regulator may oscillate, depending on the external components selected. Check that no
oscillation occurs with the application using the above capacitor.
3/7
LESHAN RADIO COMPANY, LTD.
L6401 Series
TYPICAL PERFORMANCE CHARACTERISTICS
（3.0V output）
1．Output
Voltage vs. Output Current
2．
Output Voltage vs. Input Voltage
3.2
Topr = 25
O
C CIN=1uF (ceramics), CL=1uF (ceramics)
Output Voltage VOUT (V)
3.0
2.8
IOUT =
0mA
= 30mA
= 100mA
2.6
2.4
2.2
2.5
3.0
Input Voltage VIN (V)
3.5
3．Dropout
Voltage vs. Output Current
4．
Dropout Voltage vs. Output Voltage
5．Output
Voltage vs. Ambient Temperature
6．Ripple
Rejection Rate
7．Transient
Response
Input Transient Response
Load Transient Response
4/7
LESHAN RADIO COMPANY, LTD.
L6401 Series
Ordering Information
L6401①②③④⑤⑥⑦⑧
DESIGNATOR
DESCRIPTION
SYMBOL
E
①
Regulator1
EN type
F
G
H
E
②
Regulator2
EN type
F
G
H
③④
⑤⑥
⑦
⑧
Regulator1 Output Voltage
Regulator2 Output Voltage
Packaging Types
Device Orientation
13½50
13½50
M
R
L
DESCRIPTION
Active 'High' (pull-down resistor built in)
Active 'High' (no pull-down resistor built in)
Active 'Low' (pull-up resistor built in)
Active 'Low' (no pull-up resistor built in)
Active 'High' (pull-down resistor built in)
Active 'High' (no pull-down resistor built in)
Active 'Low' (pull-up resistor built in)
Active 'Low' (no pull-up resistor built in)
eg. 30 represents 3.0V
eg. 30 represents 3.0V
SOT26
Embossed tape: Standard feed
Embossed tape: Reverse feed
MARKING
①Represents the product name
SYMBOL
1
PRODUCT NAME
L6401◆◆◆◆◆◆◆◆
②③Represents internally set sequential number
Include the output voltage and enable pin type information.
④Represents the assembly lot no.
0 to 9，A to Z,
reversed character of 0 to 9 and A to Z repeated(G,I,J,O,Q W excepted)
5/7
ADI Reference Circuit
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