A
XC6401 Series
ETR0309_006
Dual LDO Regulators, Low ESR Cap. Compatible
■GENERAL DESCRIPTIO N
The XC6401 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 XC6401 includes a reference voltage source, error amplifiers, driver transistors, current limiters and phase
compensators internally. The XC6401’s current limiters' foldback circuit also operates as a short protect for the output current
limiter. The output voltage for each regulator is set independe ntly by laser trimming. Voltages are selectable in 0.05V steps
within a range of 0.8V to 5.0V. The XC6401 series is also fully compatible with low ESR ceramic capacitors, reducing cost
and improving output stability.
This high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response
performance and high PSRR achieved across a broad range of frequencies. The EN function allows the output of each
regulator to be turned off independently, resulting in greatly reduced power consumption. The XC6401 series is available in
the SOT-26W or USP-6B, USP-6C ‘chip-scale’ package.
■
PPLICATIONS
●Mobile Phones
●Cordless phones and
radio communication equipment
●Portable games
●Cameras, Video recorders
●Portable Audio Equipment
●PDAs
■TYPICAL APPLICATION CIRCUITS
●SOT-26W
C
1uF
1
2
IN
3
EN1
V
EN2
V
OUT1
L1
C
1uF
C
1uF
L2
V
V
SS
OUT2
5
46
IN
■FEATURES
Maximum Output Current : More than 150mA (300mA limit)
Dropout Voltage : 100mV @100mA
Operating Voltage Rang e :
1.5V ~ 6.0V
Output Voltage Range : 0.8V~5.0V (0.05V increments)
Highly Accurate : ±2% (V
: ±30mV (V
OUT>1.5V)
OUT≦1.5V)
Low Power Consumption : 25μA (TYP.)
Standby Current : Less than 0.1μA (TYP.)
High Ripple Rejection : 70dB @1kHz
Operating Temperature Range
Low ESR Capacitor Compatible
: -40℃ ~ +85℃
: Ceramic capacitor
Low Output Noise
Packages : SOT-26W, USP-6B, USP-6C
Environmentally Friendly : EU RoHS Compliant, Pb Free
■
TYPICAL PERFORMANCE
CHARACTERISTICS
●Interactive Load Tran sient Response
●USP-6
C
1uF
V
OUT2
EN2
1
V
2
EN1
IN
3
6
IN
V
OUT1
5
V
SS
4
C
1uF
L1
C
L2
1uF
1/24
XC6401 Series
■PIN CONFIGURATION
■PIN ASSIGNMENT
SOT-26W USP-6B/C
1 3 EN1 ON/OFF Control 1
2 2 VIN Power Input
3 1 EN2 ON/OFF Control 2
4 6 VOUT2 Output 2
5 4 VSS Ground
6 5 VOUT1 Output 1
■PRODUCT CLASSIFICATION
●Selection Guide
The following options for the Regulator 1, 2, the EN pin logic, internal pull-up / down are available.
●Ordering Information
XC6401①②③④⑤⑥-⑦
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
③④
⑤⑥-⑦
(*1)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
(*2)
The device orientation is fixed in its embossed tape pocket.
For reverse orientation, please contact your local Torex sales office or representative.
(Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)
VSSVOUT1
56
12
SOT-26W
(TOP VIEW)
PIN NUMBER
①
②
VOUT2
4
3
EN2VINEN1
USP-6B /USP-6C
(BOTTOM VIEW)
PIN NAME FUNCTION
(*1)
E High Active with pull-down resistor
Regulator1,
EN type
F High Active with no pull-down resistor
G Low Active with pull-up resistor
H Low Active with no pull-up resistor
E High Active with pull-down resistor
Regulator2,
EN type
F High Active with no pull-down resistor
G Low Active with pull-up resistor
H Low Active with no pull-up resistor
Output Voltage 01~
MR SOT-26W
MR-G SOT-26W
Packages
Taping Type
(*2)
DR USP-6B
DR-G USP-6B
ER USP-6C
ER-G USP-6C
*The dissipation pad for the USP-6B/C packages
should be solder-plated in recommended mount
pattern and metal masking so as to enhance
mounting strength and heat release.
If the pad needs to be connected to other pins, it
should be connected to the V
Internally set sequential number relating output voltage of
each regulators
Regulator 1 Output Voltage Range: 0.8 ~ 5.0 V (0.05V increments)
Regulator 2 Output Voltage Range: 0.8 ~ 5.0 V (0.05V increments)
SS pin.
2/24
A
■
BSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL RATINGS UNITS
Input Voltage VIN 6.5 V
Output Current IOUT1 + IOUT2 700 mA
Output Voltage VOUT VSS -0.3 ~ VIN +0.3 V
EN Pin Voltage VEN VSS -0.3 ~ 6.5 V
SOT-26W 250
Power Dissipation
USP-6B 100
Pd
USP-6C
Operating Temperature Range Topr -40 ~ +85
Storage Temperature Range Tstg -55 ~ +125
* Sum of IOUT1 and IOUT2.
** Pd=(V
■ELECTRICAL CHARACTERISTICS
XC6401FFxx
Regulator 1, Regulator 2
IN-VOUT1)xIOUT1+(VIN-VOUT2)xIOUT2
XC6401
Series
Ta = 25℃
mW
100
℃
℃
Ta=25℃
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT
Output Voltage (*3) VOUT (E) VIN=VOUT (T) + 1.0V IOUT=30mA 0.98 VOUT(T) 1.02 V 1
Maximum Output Current IOUTMAX VIN=VOUT (T) + 1.0V 150 - - mA 1
Load Regulation △VOUT 1mA≦IOUT≦100mA - 15 60 mV 1
Dropout Voltage
Supply Current ISS
Vdif1 IOUT=30mA E-1 mV
Vdif2 I
OUT=100mA E-2 mV
IN=VEN=VOUT (T) + 1.0V,
V
I
OUT=0mA
- 25 45 μA 2
1
Standby Current ISTB VIN=VOUT (T) + 1.0V, VEN=VSS - 0.01 0.10 μA 3
Line Regulation (*7)
△VOUT VOUT(T)+1.0V≦VIN≦6.0V
△V
IN ・ VOUT VEN=VIN, IOUT=30mA
- 0.01 0.20 % / V 1
Input Voltage VIN 1.5 - 6.0 V -
Output Voltage △VOUT IOUT=30mA
- ±100 - ppm/℃ 1
Temperature Characteristics △Topr ･ VOUT -40℃≦Topr≦85℃
IN=[VOUT(T)+1.0]VDC+0.5Vp-pAC
Ripple Rejection Rate(*8) PSRR
V
IOUT=30mA, f=1kHz
- 70 - dB 5
Current Limiter Ilim VIN=VOUT (T) + 1.0V, VEN=VIN - 300 - mA 1
Short-Circuit Current Ishort VIN=VOUT (T) + 1.0V, VEN=VIN - 30 - mA 1
EN "High" Voltage VENH 1.30 - 6.0 V 4
EN "Low" Voltage VENL - - 0.25 V 4
EN "High" Current IENH VIN=VEN=VOUT (T) + 1.0V -0.10 - 0.10 μA 4
EN "Low" Current IENL VIN= VOUT (T) + 1.0V, VEN=VSS -0.10 - 0.10 μA 4
NOTE *1: VOUT(T)=Specified output voltage
*2: V
OUT(E)=Effective output voltage
(I.e. the output voltage when "V
OUT (T)≦1.45V, MIN VOUT (T) - 30mV, MAX VOUT (T) + 30mV
*3: If V
*4: Vdif={V
OUT1=A voltage equal to 98% of the output voltage whenever an amply stabilized IOUT {VOUT(T)+1.0V} is input.
*5: V
IN1=the input voltage when VOUT1 appears as input voltage is gradually decreased.
*6: V
*7: When V
*8: When V
*9: Unless otherwise stated, V
(*6)
IN1
OUT(T)>4.5V, 5.5V<VIN<6.0V
OUT(T)>4.8V, VIN=5.75VDC+0.5Vp-pAC
-VOUT1
(*5)
}
OUT(T)＋1.0V" is provided at the VIN pin while maintaining a certain IOUT value).
IN=VOUT(T)+1.0V
3/24
XC6401 Series
■ELECTRICAL CHARACTERISTICS (Continued)
●Dropout Voltage
E-1 E-2
80 400 240 500
65 300 200 400
60 200 180 300
55 100 165 250
50 75 150 200
45 65 140 180
40 60 120 170
35 55 110 160
SETTING OUTPUT VOLTAGE
(V) VOUT Vdif 1 Vdif 2
VOUT(T) MIN. MAX. TYP. MAX. TYP. MAX.
0.80 0.770 0.830
0.85 0.820 0.880
0.90 0.870 0.930
0.95 0.920 0.980
1.00 0.970 1.030
1.05 1.020 1.080
1.10 1.070 1.130
1.15 1.120 1.180
1.20 1.170 1.230
1.25 1.220 1.280
1.30 1.270 1.330
1.35 1.320 1.380
1.40 1.370 1.430
1.45 1.420 1.480
1.50 1.470 1.530
1.55 1.519 1.581
1.60 1.568 1.632
1.65 1.617 1.683
1.70 1.666 1.734
1.75 1.715 1.785
1.80 1.764 1.836
1.85 1.813 1.887
1.90 1.862 1.938
1.95 1.911 1.989
2.00 1.960 2.040
2.05 2.009 2.091
2.10 2.058 2.142
2.15 2.107 2.193
2.20 2.156 2.244
2.25 2.205 2.295
2.30 2.254 2.346
2.35 2.303 2.397
2.40 2.352 2.448
2.45 2.401 2.499
2.50 2.450 2.550
2.55 2.499 2.601
2.60 2.548 2.652
2.65 2.597 2.703
2.70 2.646 2.754
2.75 2.695 2.805
2.80 2.744 2.856
2.85 2.793 2.907
2.90 2.842 2.958
2.95 2.891 3.009
DETECT VOLTAGE
(V) (mV) (mV)
DROPOUT VOLTAGE 1 DROPOUT VOLTAGE 2
300 700 400 800
200 600 350 700
100 500 270 600
4/24
■DROPOUT VOLTAGE CHART (Continued)
●Dropout Voltage (Continued)
SETTING OUTPUT VOLTAGE
(V) VOUT Vdif 1 Vdif 2
VOUT(T) MIN. MAX. TYP. MAX. TYP. MAX.
3.00 2.940 3.060
3.05 2.989 3.111
3.10 3.038 3.162
3.15 3.087 3.213
3.20 3.136 3.264
3.25 3.185 3.315
3.30 3.234 3.366
3.35 3.283 3.417
3.40 3.332 3.468
3.45 3.381 3.519
3.50 3.430 3.570
3.55 3.479 3.621
3.60 3.528 3.672
3.65 3.577 3.723
3.70 3.626 3.774
3.75 3.675 3.825
3.80 3.724 3.876
3.85 3.773 3.927
3.90 3.822 3.978
3.95 3.871 4.029
4.00 3.920 4.080
4.05 3.969 4.131
4.10 4.018 4.182
4.15 4.067 4.233
4.20 4.116 4.284
4.25 4.165 4.335
4.30 4.214 4.386
4.35 4.263 4.437
4.40 4.312 4.488
4.45 4.361 4.539
4.50 4.410 4.590
4.55 4.459 4.641
4.60 4.508 4.692
4.65 4.557 4.743
4.70 4.606 4.794
4.75 4.655 4.845
4.80 4.704 4.896
4.85 4.753 4.947
4.90 4.802 4.998
4.95 4.851 5.049
5.00 4.900 5.100
DETECT VOLTAGE
(V) (mV) (mV)
DROPOUT VOLTAGE 1 DROPOUT VOLTAGE 2
30 45 100 150
XC6401
Series
E-1 E-2
5/24
XC6401 Series
■OPERATIONAL EXPLANATION
＜Output Voltage Control＞
The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. T he
P-channel MOSFETs, which are connected to the V
signal. The output voltages at the VOUT1 and VOUT2 pins are controlled and stabilized by a system of negative
feedback. The current limit circuit and short protect circuit operate in relation to the level of output current. Further, the
IC's internal circuitry can be shutdown via the EN pin's signal.
EN1
ON/OFF
Control
VR1
each
circuit
V
IN
V
SS
EN2
VR2
each
circuit
ON/OFF
Control
Voltage
Reference
＜Low ESR Capacitors＞
With the XC6401 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase
compensation circuit is built-in. In order to ensure the effectiveness of the phase compensation, we suggest that output
capacitors (CL1, CL2) is connected as close as possible to the output pins (V
Please use an output capacitor with a capacitance value of at least 1μF. Also, please connect an input capacitor (C
1μF between the VIN pin and the VSS pin in order to ensure a stable power input.
＜Current Limiter, Short-Circuit Protection＞
The XC6401 series includes a combination of a fixed current limiter circuit & a foldback circuit which aid the operations of
the current limiter and circuit protection. When the load current reaches the current limit level, the fixed current limiter
circuit operates and output voltage drops. As a result of this drop in output voltage, the foldback circuit operates, output
voltage drops further and output current decreases. When the output pin is shorted, a current of about 30mA flows.
＜EN Pins＞
The IC's internal circuitry can be shutdown via the signal from the EN1 and EN2 pins with the XC6401 series. In
shutdown mode, output at the V
The operational logic of the IC's EN1 and EN2 pins are selectable (please refer to the selection guid e). Note that as the
standard XC6401FF type's regulator 1 and 2 are both ' High Active/No Pull Down', operati ons will become unstable with
the EN1 or EN2 pins open. Although the EN1 and EN2 pins are equal to an inverter input with CMOS hysteresis, with
either the pull-up or pull-down options, the EN1 and EN2 pins input current will increase when the IC is in operation.
We suggest that you use this IC with either a V
used with the correct specifications for the EN1 and EN2 pins, the operational logic is fixed and the IC will operate
normally. However, supply current may increas e as a result o f through current in the IC's internal circuitry.
■NOTES ON USE
1. Please use this IC within the stated absolute maximum ratings.
The IC is liable to malfunction should the ratings be exceeded.
2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag
depending on output current. Please keep the resistance low between V
3. Please wire the input capacitor (C
OUT1 and VOUT2 pins will be pulled down to the VSS level via R11 & R12 and R21 & R22.
IN) and the output capacitors (CL1, CL2) as close to the IC as possible.
OUT1 and VOUT2 pins, are then driven by the subsequent output
-
Error
Amp1
+
-
Error
Amp2
+
IN voltage or a VSS voltage input at the EN1 and EN2 pins. If this IC is
Current
Limit
Current
Limit
OUT1
V
R11
R12
V
OUT2
R21
R22
OUT1 and VOUT2) and the VSS pin.
IN and VSS wiring in particular.
IN) of
6/24
■TEST CIRCUITS
Circuit ①
V
Circuit ②
Circuit ③
CIN
EN1
EN2
CIN, CL 1 , CL2 : 1 μF(ceramic)
V
IN
V
OUT1
V
OUT2
V
SS
CL1
CL2
XC6401
Series
A
I
OUT1
V
RL1
A
I
OUT2
V
RL2
EN1/EN2 :
High Active = EN=V
Low Active = EN=V
IN
SS
EN1/EN2 :
1. High Active with pull-down resistor built-in
VR1 Supply Current I
SS1=I1 (Note:EN1=ON, EN2=OFF)
VR2 Supply Current ISS2=I1 (Note:EN1=OFF, EN2= ON)
2. High Active with no pull-down resistor built-in
VR1 Supply Active Current I
SS1=I1
(Note:EN1=ON, EN2=OFF)
VR2 Supply Current I
SS2=I1 (Note:EN1=OFF, EN2=ON)
3. Low Active with pull-up resistor built-in
VR1 Supply Current I
SS1=I1+I2
(Note:EN1=ON, EN2=OFF)
VR2 Supply Current I
SS2=I1+I3
(Note:EN1=OFF, EN2=ON)
4. Low Active with no pull-up resistor built-in
VR1 Supply Current I
VR2 Supply Current I
SS1=I1 (Note:EN1=ON, EN2=OFF)
SS2=I1 (Note:EN1=OFF, EN2=ON)
EN1/EN2:
High Active = EN= V
Low Active = EN= V
SS
IN
7/24
)
XC6401 Series
■TEST CIRCUITS (Continued
Circuit ④
Circuit ⑤
EN1/EN2 :
High Active = EN=V
Low Active = EN=V
IN
SS
8/24
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