Datasheet
CMOS LDO Regulator Series for Portable Equipments
Versatile Package
FULL CMOS LDO Regulator
BUxxUB3WG series
●General
Description
BUxxUB3WG series is high-performance FULL CMOS
regulator with 360-mA output, which is mounted on
versatile package SSOP5 (2.9 mm
×
2.8 mm
×
1.25 mm).
It has excellent noise characteristics and load
responsiveness characteristics despite its low circuit
current consumption of 50μA. It is most appropriate for
various applications such as power supplies for logic IC,
RF, and camera modules.ROHM’s.
●Key
Specifications
Output voltage:
Accuracy output voltage:
Low current consumption:
Operating temperature range:
1.0V to 2.6V
±1.0% (±25mV)
50μA
-40°C to +85°C
●Applications
Battery-powered portable equipment, etc.
●Package
SSOP5:
●Features
High accuracy detection
low current consumption
Compatible with small ceramic capacitor (Cin=Co=1.0uF)
With built-in output discharge circuit
High ripple rejection
ON/OFF control of output voltage
With built-in over current protection circuit
and thermal shutdown circuit
Package SSOP5 is similar to SOT-23-5 (JEDEC)
Low dropout voltage
2.90mm x 2.80mm x 1.25mm
●Typical
Application Circuit
STBY
VIN
STBY
VIN
VOUT
VOUT
GND
GND
GND
Fig.1 Application Circuit
○Product
structure:Silicon monolithic integrated circuit
○This
product is not designed protection against radioactive rays.
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BUxxUB3WG series
●Connection
Diagram
VOUT
SSOP5
Datasheet
N.C.
Marking
VIN GND STBY
TOP VIEW
●Pin
Descriptions
SSOP5
PIN No.
1
2
3
4
5
Symbol
VIN
GND
STBY
N.C.
VOUT
Lot. No
Function
Power Supply Voltage
Grouding
ON/OFF control of output voltage
(High: ON, Low: OFF)
Unconnected Terminal
Output Voltage
Ordering Information
B
Part
Number
U
x
x
U
B
3
W
G
-
½
Halogen Free
G : compatible
Blank : incompatible
½
½
Output Voltage
10 : 1.0V
26 : 2.6V
Low Dropout Voltage
Maximum Output Current
360mA
with
Package
output discharge G : SSOP5
Packageing and forming specification
Embossed tape and reel
TR : The pin number 1 is the upper right
TL : The pin number 1 is the lower left
SSOP5
2.9±0.2
5
4
+
6
°
4
° −4°
+0.2
1.6
−0.1
2.8±0.2
1
2
3
+0.05
0.13
−0.03
1.25Max.
1.1±0.05
0.05±0.05
+0.05
0.42
−0.04
0.95
0.1
(Unit : mm)
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BUxxUB3WG series
●Lineup
Marking
Output Voltage
Part Number
Datasheet
MW
1.0V
BU10
LL
2.1V
BU21
MX
1.15V
BU1B
LM
2.3V
BU23
MZ
1.2V
BU12
LN
2.5V
BU25
M6
1.25V
BU1C
LP
2.6V
BU26
M7
1.5V
BU15
M2
1.8V
BU18
M8
1.85V
BU1J
M9
1.9V
BU19
LJ
2.0V
BU20
●Absolute
Maximum Ratings (Ta=25°C)
PARAMETER
Symbol
VMAX
Pd
TjMAX
Topr
Tstg
Limit
-0.3
½
+4.0
540(*1)
+125
-40
½
+85
-55
½
+125
Unit
V
mW
℃
℃
℃
Power Supply Voltage
Power Dissipation
Maximum junction temperature
Operating Temperature Range
Storage Temperature Range
(*1)Pd deleted at 5.4mW/℃ at temperatures above Ta=25℃, mounted on 70×70×1.6 mm glass-epoxy PCB.
●
RECOMMENDED OPERATING RANGE (not to exceed Pd)
PARAMETER
Power Supply Voltage
Maximum Output Current
Symbol
VIN
IMAX
Limit
1.7½3.6
360
Unit
V
mA
●OPERATING
CONDITIONS
PARAMETER
Input Capacitor
Output Capacitor
Symbol
Cin
Co
MIN.
0.47(*2)
0.47(*2)
TYP.
1.0
1.0
MAX.
-
-
Unit
μF
μF
CONDITION
Ceramic capacitor recommended
(*2)Make sure that the output capacitor value is not kept lower than this specified level across a variety of
temperature, DC bias, changing as time progresses characteristic.
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●Electrical
Characteristics
(Ta=25℃, VIN=VOUT+1.0V (*3), STBY=VIN, Cin=1.0μF, Co=1.0μF, unless otherwise noted.)
Limit
MIN.
TYP.
MAX.
Datasheet
PARAMETER
Symbol
Unit
Conditions
Overall Device
Output Voltage 1
Operating Current
Operating Current (STBY)
Ripple Rejection Ratio
VOUT1
IIN
ISTBY
RR
VOUT×0.99
VOUT-25mV
-
-
45
-
-
-
Dropout Voltage
VSAT
-
-
-
Line Regulation
Load Regulation
VDL
VDLO
-
-
-
250
220
200
2
25
35
320
260
220
20
45
55
mV
mV
mV
mV
mV
mV
1.7V≦VOUT＜2.1V(IOUT=300mA)
2.1V≦VOUT＜2.5V(IOUT=300mA)
2.5V≦VOUT＜2.6V(IOUT=300mA)
VIN=VOUT+1.0V to 3.6V(*4), IOUT=10μA
IOUT=0.01mA to 300mA
IOUT=0.01mA to 360mA
VOUT
50
-
70
470
350
280
VOUT×1.01
VOUT+25mV
90
1.0
-
700
500
380
V
μA
μA
dB
mV
mV
mV
IOUT=10μA，VOUT≧2.5V
IOUT=10μA，VOUT＜2.5V
IOUT=0mA
STBY=0V
VRR=-20dBv,fRR=1kHz,IOUT=10mA, VIN=3.6V
1.0V≦VOUT＜1.2V(IOUT=300mA)
1.2V≦VOUT＜1.5V(IOUT=300mA)
1.5V≦VOUT＜1.7V(IOUT=300mA)
Over-current Protection (OCP)
Limit Current
Short Current
ILMAX
ISHORT
370
50
550
150
-
300
mA
mA
Vo=VOUT*0.95
Vo=0V
Standby Block
Discharge
Resistor
RDSC
ISTB
VSTBH
VSTBL
VOUT2
20
0.1
1.2
-0.3
1.7
50
0.9
-
-
1.8
80
8.0
5.5
0.3
1.9
Ω
μA
V
V
V
VIN=2.375V to 2.625V
VOUT=1.8V, IOUT=0.01mA to 300mA, Ta=-40½85℃
VIN=3.6V, STBY=0V, VOUT=2.6V
STBY=1.5V
STBY Pin Pull-down Current
STBY Control Voltage
Output Voltage 2
ON
OFF
●This product is not designed for protection against radioactive rays.
(*3) VIN=2.5V for VOUT≦1.5V
(*4) VIN=2.5V to 3.6V for VOUT≦1.5V
●Block
Diagrams
VIN
VIN
1
VREF
Cin
5
VOUT
GND
2
VOUT
OCP
TSD
Co
STBY
STBY
3
STBY
Discharge
Cin½½½1.0μF (Ceramic)
Co
½½½1.0μF
(Ceramic)
Fig. 2 Block Diagrams
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Reference data
Datasheet
(Ta=25ºC unless otherwise specified.)
BU18UB3WG
LINE REGULATION
1.90
1.88
1.86
1.84
LINE REGULATION
Vout=1.8V
Iout=10mA
1.90
1.88
1.86
1.84
Vout=1.8V
Iout=300mA
VOUT[V]
1.80
1.78
1.76
1.74
1.72
1.70
85℃
25℃
-40℃
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
VOUT[V]
1.82
1.82
1.80
1.78
1.76
1.74
1.72
1.70
85℃
25℃
-40℃
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
VIN[V]
VIN[V]
Fig. 3
Fig. 4
1.90
1.88
1.86
1.84
LOAD REGULATION
Vout=1.8V
1.90
1.88
1.86
1.84
OUTPUT VOLTAGE vs TEMPERATURE
Vout=1.8V
VOUT[V]
1.80
1.78
1.76
1.74
1.72
1.70
0
50
100
150
200
250
85℃
25℃
-40℃
300
VOUT[V]
1.82
1.82
1.80
1.78
1.76
1.74
1.72
1.70
-40
-20
0
10mA
150mA
300mA
IOUT[mA]
Temperature[℃]
20
40
60
80
Fig. 5
Fig. 6
70
65
60
55
50
45
GROUND PIN CURRENT vs INPUT VOLTAGE
Vout=1.8V
450
400
350
300
GROUND PIN CURRENT vs LOAD
Vout=1.8V
IGND[uA]
40
35
30
25
20
15
10
5
0
2.3
2.5
2.7
2.9
3.1
3.3
3.5
IGND[uA]
85℃
25℃
-40℃
250
200
150
100
50
0
0
50
100
150
200
250
85℃
25℃
-40℃
300
VIN[V]
IOUT[mA]
Fig. 7
Fig. 8
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