UM4750
300mA, Micropower, Dual Channel VLDO Linear Regulator
UM4750S-xx
SOT23-6
UM4750DA-xx
DFN6 2.0×
2.0
UM4750DB-xx
DFN8 3.0×
3.0
General Description
The UM4750 series are dual channel VLDO (very low dropout) linear regulators designed for low
power portable applications. The range of output voltage is from 1.2V to 5.0V while operated
from 2.5V to 5.5V input. Typical output noise is only 200μV
RMS
and maximum dropout is just
200mV at the load current of 100mA.
The UM4750 series offer high output voltage accuracy, excellent transient response, stability with
ultra low ESR ceramic capacitors as small as 1μF, thermal overload protection and output current
limiting.
The UM4750S-xx series are available in a low profile SOT23-6 package, the UM4750DA-xx
series are available in a low profile DFN6 2.0×
2.0 package, and UM4750DB-xx series are
available in a low profile DFN8 3.0×3.0 package.
Applications
Bluetooth/802.11 Cards
PDAs and Notebook Computers
Portable Instruments and
Battery-Powered Systems
Cellular Phones
Features
Very Low Dropout: 200mV(max) at 100mA
Maximum Input Voltage: 5.5V
Low Noise:200μV
RMS
(10Hz to 100kHz)
Fast Transient Response
Dual LDO Outputs(300mA/300mA)
Output Current Limit
Stable with 1μF Output Capacitor
Thermal Overload Protection
Low Profile SOT23-6, 6-Lead DFN 2.0×
2.0
and 8-Lead DFN 3.0×3.0 Packages
Pin Configurations
Top View
VOUT1 VIN
EN1
6
5
4
7XX
1
2
M
3
VOUT2 GND
EN2
M: Month Code
UM4750S-xx
SOT23-6
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UM4750
(Top View)
VIN
GND
EN1
1
2
3
6
5
4
VOUT1
VOUT2
EN2
Marking Pin1
7XX
M: Month Code
UM4750DA-xx
DFN6 2.0×
2.0
(Top View)
VIN
1
GND
8
7
6
VOUT1
NC
GND
7XX
EN1 2
EN2
NC
3
4
5 VOUT2
M: Month Code
UM4750DB-xx
DFN8 3.0×
3.0
Pin Description
Pin Number
UM4750S-xx
1
2
3
4
5
6
-
UM4750DA-xx
5
2
4
3
1
6
-
UM4750DB-xx
5
6
3
2
1
8
4,7
Symbol
VOUT2
GND
EN2
EN1
VIN
VOUT1
NC
Function
Channel2 output voltage
Ground
Enable2 Input, Active High
Enable1 Input, Active High
Power Supply
Channel1 output voltage
No connection
Naming Information
UM4750
-
Channel 2 Output Voltage
Channel 1 Output Voltage
Package Type
S: SOT23-6
DA: DFN6 2.0×
2.0
DB: DFN8 3.0×
3.0
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M
M
UM4750
Available Voltage Version
Code
A
B
C
D
E
Voltage
5
4.8
4.7
4.5
4.3
Code
F
G
H
J
K
Voltage
4.2
4
3.8
3.6
3.5
Code
L
M
N
P
Q
Voltage
3.3
3
2.8
2.7
2.5
Code
R
S
T
U
Voltage
1.8
1.5
1.3
1.2
Ordering Information
Part Number
UM4750S-RN
UM4750S-RL
UM4750S-NR
UM4750S-xx
UM4750DA-xx
UM4750DB-xx
Packaging Type
SOT23-6
DFN6 2.0×2.0
DFN8 3.0×3.0
Marking Code
UDS
UDT
UGS
7XX
7XX
7XX
Shipping Qty
3000pcs/7Inch
Tape & Reel
Absolute Maximum Ratings (Note 1)
Symbol
V
IN
V
OUT
T
J
T
STG
T
L
Parameter
Supply Voltage on IN Pin
Voltage on OUT Pin
Operating Junction Temperature (Notes 2, 3)
Storage Temperature Range
Lead Temperature for Soldering 10 seconds
ESD Susceptibility HBM
SOT23-6
P
D
Power Dissipation at
T
A
= 25°
C
DFN6 2.0×2.0
DFN8 3.0×3.0
Value
-0.3 to +6.5
-0.3 to +7.5
-40 to +125
-65 to +150
+300
2000
0.5
0.7
0.9
W
Unit
V
V
°
C
°
C
°
C
V
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be
impaired.
Note 2: The device is guaranteed to meet performance specifications from 0℃ to 70℃.
Specifications over the – 40℃ to 125℃ operating junction temperature range are
guaranteed by design, characterization and correlation with statistical process controls.
Note 3: This IC includes over temperature protection circuit inside that is intended to protect the
device during momentary overload conditions. Over temperature protection trip point is
around 160℃. Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
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UM4750
Recommended Operating Conditions (Note 4)
Supply Input Voltage
Enable Input Voltage
Junction Temperature Range
Ambient Temperature Range
2.5V to 5.5V
0V to 5.5V
-40° to 125°
C
C
-40° to 85°
C
C
Note 4: The device is not guaranteed to function outside its operating conditions.
Internal Block Diagram
EN1
Shutdown
and
Logic Control
VIN
1.2V
-
+
Error
Amplifier
Current-Limit
VOUT1
V
REF
Thermal
Protection
Shutdown
and
Logic Control
GND
EN2
1.2V
________________________________________________________________________
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-
+
Error
Amplifier
Current-Limit
VOUT2
GND
UM4750
Electrical Characteristics
V
CC
=+5V±
10%,C
IN
=1μF,C
OUT1
=C
OUT2
=1μF,T
A
=-40℃ to +85℃.Typical conditions are at Vcc=5V,
T
A
=25℃.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Voltage
V
IN
2.5
5.5
V
Range
Output Voltage
V
OUT
1.2
5.0
V
Range
Operating
Quiescent Current
Shut Down Current
EN Input Current
Output Current
Output Voltage
Accuracy
Dropout Voltage
Output Current
Limit
Startup Time
Response
EN Input Low
Voltage
EN Input High
Voltage
Output Voltage TC
Thermal-Shutdown
Temperature
Thermal-Shutdown
Hysteresis
I
Q
I
Q_SD
I
EN
I
OUT
I
OUT
=0mA
EN1=EN2=GND
EN=V
IN
or GND
300
I
OUT
=10mA
ΔV
DO
I
LIMT
t
V
IL
V
IH
R
L
=68Ω, C
OUT
=1μF
V
IN
=2.5V to5.5V
0.7×
IN
V
100
T
SHDN
ΔT
SHDN
1.5<V
OUT
≤4V
V
OUT
+1V≤V
IN
≤5.5V,
I
OUT
=10mA
4V<V
OUT
≤5V
or 1.2V≤V
OUT
≤1.5V
V
OUT
+1V≤V
IN
≤5.5V and
V
IN
>2.5V,I
OUT
=10mA
V
OUT
≤4V
1mA≤I
OUT
≤300mA
4V<V
OUT
≤5V
1mA≤I
OUT
≤300mA
10Hz to 100KHz
C
IN
=1μF, I
OUT
=10mA
V
IN
=V
OUT
+1V
I
OUT
=100mA
f=100Hz
60
45
2
150
30
0.3
%/V
0.6
I
OUT
=100mA, V
OUT
>2.8V
330
-2
100
450
20
0.3×
IN
V
2
200
700
110
190
2
1
μA
μA
μA
mA
%
mV
mA
μs
V
V
ppm/℃
℃
℃
Line Regulation
LNR
0.6
%
0.8
200
μV
RMS
dB
kV
Load Regulation
Output Voltage
Noise
Power Supply
Ripple Rejection
ESD Rating
LDR
PSRR
f=1kHz
Human Body Mode
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