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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.
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
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:
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
SSOP5
VOUT
N.C.
Datasheet
Marking
Lot. No
Pin Descriptions
VIN GND STBY
TOP VIEW
PIN No.
1
2
3
4
5
Symbol
VIN
GND
STBY
N.C.
VOUT
SSOP5
Function
Power Supply Voltage
Grouding
ON/OFF control of output voltage
(High: ON, Low: OFF)
Unconnected Terminal
Output Voltage
z Ordering Information
B U x x U B3 W G
-
xx
Part
Number
Output Voltage
10 : 1.0V
26 : 2.6V
SSOP5
Low Dropout Voltage
Maximum Output Current
360mA
with Package
output discharge G : SSOP5
2.9±0.2
54
4°
+6°
4°
Halogen Free
G : compatible
Blank : incompatible
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
123
0.13
+0.05
0.03
+0.05
0.42 0.04
0.95
0.1
(Unit : mm)
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BUxxUB3WG series
Datasheet
Lineup
Marking
Output Voltage
Part Number
MW
1.0V
BU10
MX
1.15V
BU1B
MZ
1.2V
BU12
M6
1.25V
BU1C
M7
1.5V
BU15
M2
1.8V
BU18
M8
1.85V
BU1J
M9
1.9V
BU19
LL
2.1V
BU21
LM
2.3V
BU23
LN
2.5V
BU25
LP
2.6V
BU26
Absolute Maximum Ratings (Ta=25°C)
PARAMETER
Symbol
Limit
Unit
Power Supply Voltage
VMAX
-0.3 +4.0
V
Power Dissipation
Pd
540(*1)
mW
Maximum junction temperature
TjMAX
+125
Operating Temperature Range
Topr
-40 +85
Storage Temperature Range
Tstg
-55 +125
(*1)Pd deleted at 5.4mW/at temperatures above Ta=25, mounted on 70×70×1.6 mm glass-epoxy PCB.
LJ
2.0V
BU20
RECOMMENDED OPERATING RANGE (not to exceed Pd)
PARAMETER
Power Supply Voltage
Symbol
VIN
Maximum Output Current
IMAX
Limit
1.73.6
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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BUxxUB3WG series
Datasheet
Electrical Characteristics
(Ta=25℃, VIN=VOUT+1.0V (*3), STBY=VIN, Cin=1.0μF, Co=1.0μF, unless otherwise noted.)
PARAMETER
Overall Device
Output Voltage 1
Operating Current
Operating Current (STBY)
Symbol
MIN.
Limit
TYP.
MAX.
Unit
Conditions
VOUT1
IIN
ISTBY
VOUT×0.99
VOUT-25mV
-
-
VOUT
50
-
VOUT×1.01
VOUT+25mV
90
1.0
V
μA
μA
IOUT=10μA,VOUT≧2.5V
IOUT=10μA,VOUT<2.5V
IOUT=0mA
STBY=0V
Ripple Rejection Ratio
RR 45 70
- dB VRR=-20dBv,fRR=1kHz,IOUT=10mA, VIN=3.6V
- 470 700 mV 1.0V≦VOUT<1.2V(IOUT=300mA)
- 350 500 mV 1.2V≦VOUT<1.5V(IOUT=300mA)
Dropout Voltage
VSAT
-
-
280 380 mV 1.5V≦VOUT<1.7V(IOUT=300mA)
250 320 mV 1.7V≦VOUT<2.1V(IOUT=300mA)
- 220 260 mV 2.1V≦VOUT<2.5V(IOUT=300mA)
- 200 220 mV
Line Regulation
VDL -
2 20 mV
Load Regulation
VDLO
Over-current Protection (OCP)
-
-
25 45 mV
35 55 mV
Limit Current
ILMAX
370
550
- mA
Short Current
ISHORT
50
150 300 mA
Standby Block
Discharge Resistor
RDSC
20
50
80 Ω
STBY Pin Pull-down Current ISTB
0.1
0.9
8.0 μA
ON
STBY Control Voltage
OFF
VSTBH
VSTBL
1.2
-0.3
-
-
5.5 V
0.3 V
Output Voltage 2
VOUT2
1.7
1.8
1.9 V
●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
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
Vo=VOUT*0.95
Vo=0V
VIN=3.6V, STBY=0V, VOUT=2.6V
STBY=1.5V
VIN=2.375V to 2.625V
VOUT=1.8V, IOUT=0.01mA to 300mA, Ta=-40~85℃
Block Diagrams
VIN
VIN
1
Cin
GND 2
STBY
STBY
3
VREF
OCP
TSD
STBY
Discharge
Fig. 2 Block Diagrams
VOUT
5
VOUT
Co
Cin・・・1.0μF (Ceramic)
Co ・・・1.0μF (Ceramic)
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BUxxUB3WG series
z Reference data BU18UB3WG (Ta=25ºC unless otherwise specified.)
Datasheet
LINE REGULATION
1.90 Vout=1.8V
1.88 Iout=10mA
1.86
1.84
1.82
1.80
1.78
1.76
1.74
85℃
1.72 25℃
1.70 -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]
Fig. 3
LINE REGULATION
1.90 Vout=1.8V
1.88 Iout=300mA
1.86
1.84
1.82
1.80
1.78
1.76
1.74
85℃
1.72 25℃
1.70 -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]
Fig. 4
1.90
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
0
LOAD REGULATION
Vout=1.8V
85℃
25℃
-40℃
50 100 150 200 250 300
IOUT[mA]
Fig. 5
1.90
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
-40
OUTPUT VOLTAGE vs TEMPERATURE
Vout=1.8V
10mA
150mA
300mA
-20 0
20 40 60 80
Temperature[℃]
Fig. 6
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
2.3
GROUND PIN CURRENT vs INPUT VOLTAGE
Vout=1.8V
85℃
25℃
-40℃
2.5 2.7 2.9 3.1 3.3 3.5
VIN[V]
Fig. 7
450
400
350
300
250
200
150
100
50
0
0
GROUND PIN CURRENT vs LOAD
Vout=1.8V
85℃
25℃
-40℃
50 100 150 200 250 300
IOUT[mA]
Fig. 8
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