UM4750S-RN [UNIONSEMI]
300mA, Micropower, Dual Channel VLDO Linear Regulator;
| 型号： | UM4750S-RN |
| 厂家： | 
Union Semiconductor, Inc. |
| 描述： | 300mA, Micropower, Dual Channel VLDO Linear Regulator |
| 文件： | 总13页 (文件大小：484K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 200μVRMS 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
Features
Very Low Dropout: 200mV (Max) at 100mA
Maximum Input Voltage: 5.5V
Bluetooth/802.11 Cards
PDAs and Notebook Computers
Portable Instruments and
Battery-Powered Systems
Cellular Phones
Low Noise:200μVRMS (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
6
1
5
4
3
VOUT1 VIN
EN1
XXX
2
M: Month Code
UM4750S-xx
SOT23-6
VOUT2 GND EN2
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(Top View)
7XX
VOUT1
1
2
3
6
5
4
VIN
GND
EN1
Marking Pin1
NC
VOUT2
EN2
M: Month Code
UM4750DA-xx
DFN6 2.0×2.0
(Top View)
7XX
VIN
1
8
VOUT1
NC
EN1
EN2
NC
2
3
4
7
6
5
Marking Pin1
GND
GND
M: Month Code
UM4750DB-xx
DFN8 3.0×3.0
VOUT2
Pin Description
Pin Number
UM4750S-xx UM4750DA-xx UM4750DB-xx
Symbol
Function
1
2
3
4
5
6
5
2
4
3
1
6
5
6
3
2
1
8
VOUT2 Channel2 Output Voltage
GND
EN2
EN1
VIN
Ground
Enable2 Input, Active High
Enable1 Input, Active High
Power Supply
VOUT1 Channel1 Output Voltage
NC No Connection
-
-
4,7
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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Available Voltage Version
Code
A
Voltage
5
Code
Voltage
4.2
Code
L
Voltage
3.3
Code
Voltage
1.8
F
G
H
J
R
S
B
4.8
4
M
N
3
1.5
C
4.7
3.8
2.8
T
U
1.3
D
4.5
3.6
P
2.7
1.2
E
4.3
K
3.5
Q
2.5
Ordering Information
Part Number
UM4750S-RN
UM4750S-RL
UM4750S-NR
UM4750S-xx
UM4750DA-xx
Packaging Type
Marking Code
UDS
Shipping Qty
UDT
UGS
7XX
7XX
SOT23-6
3000pcs/7Inch
Tape & Reel
DFN6 2.0×2.0
DFN8 3.0×3.0
UM4750DB-xx
7XX
Absolute Maximum Ratings (Note 1)
Symbol
VIN
Parameter
Supply Voltage on VIN Pin
Voltage on VOUT Pin
Value
Unit
V
-0.3 to +6.5
-0.3 to +7.5
-40 to +125
-65 to +150
VOUT
TJ
V
Operating Junction Temperature (Notes 2, 3)
Storage Temperature Range
Lead Temperature for Soldering 10 seconds
ESD Susceptibility HBM
°C
°C
°C
V
TSTG
TL
+300
2000
SOT23-6
0.5
0.7
0.9
Power Dissipation at
DFN6 2.0×2.0
TA = 25°C
PD
W
DFN8 3.0×3.0
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°C to 70°C .
Specifications over the -40°C to 125°C 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°C . Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
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Recommended Operating Conditions (Note 4)
Parameter
Supply Input Voltage
Enable Input Voltage
Junction Temperature Range
Value
2.5 to 5.5
0 to 5.5
Unit
V
V
°C
-40 to 125
°C
Ambient Temperature Range
-40 to 85
Note 4: The device is not guaranteed to function outside its operating conditions.
Internal Block Diagram
EN1
Shutdown
VIN
and
Logic Control
1.2V
+
Error
Amplifier
VOUT1
Current-Limit
VREF
Thermal
Protection
GND
EN2
Shutdown
and
Logic Control
1.2V
+
Error
Amplifier
VOUT2
Current-Limit
GND
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Electrical Characteristics
VCC=+5V±10%, CIN=1μF, COUT1=COUT2=1μF, TA=-40°C to +85°C . Typical conditions are at
VCC=5V, TA=25°C .
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Voltage
Range
VIN
2.5
5.5
V
Output Voltage
Range
VOUT
IQ
1.2
5.0
V
Operating
Quiescent Current
IOUT=0mA
110
190
μA
μA
Shut Down Current
IQ_SD
EN1=EN2=GND
EN=VIN or GND
2
1
EN Input Current
Output Current
IEN
μA
IOUT
300
-2
mA
Output Voltage
Accuracy
IOUT=10mA
2
%
Dropout Voltage
Output Current
Limit
ΔVDO
IOUT=100mA, VOUT>2.8V
100
450
200
700
mV
mA
ILIMT
330
Startup Time
Response
t
RL=68Ω, COUT=1μF
20
μs
EN Input Low
Voltage
EN Input High
Voltage
VIL
VIH
VIN=2.5V to5.5V
0.3×VIN
V
0.7×VIN
V
ppm/°C
°C
Output Voltage TC
100
150
Thermal-Shutdown
Temperature
TSHDN
Thermal-Shutdown
Hysteresis
ΔTSHDN
30
°C
1.5<VOUT≤4V
VOUT+1V≤VIN≤5.5V,
IOUT=10mA
0.3
0.6
Line Regulation
LNR
LDR
%/V
4V<VOUT≤5V
or 1.2V≤VOUT≤1.5V
VOUT+1V≤VIN≤5.5V and
VIN>2.5V, IOUT=10mA
VOUT≤4V
0.6
0.8
1mA≤IOUT≤300mA
4V<VOUT≤5V
1mA≤IOUT≤300mA
Load Regulation
%
Output Voltage
Noise
10Hz to 100KHz
CIN=1μF, IOUT=10mA
200
μVRMS
f=100Hz
f=1kHz
60
Power Supply
Ripple Rejection
VIN=VOUT+1V
IOUT=100mA
PSRR
dB
kV
45
2
ESD Rating
Human Body Mode
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Typical Performance Characteristics
Quiescent Current vs. Input Voltage
Dropout Voltage vs. Output Current
520
480
440
400
360
320
280
240
200
160
120
80
130
125
120
115
110
105
100
95
VOUT2=1.8V
90
85
80
75
70
UM4750S-NR
VOUT1=2.8V
UM4750S-NR
40
0
2.5
3
3.5
4
4.5
5
5.5
6
0
25
50
75
100 125 150 175 200 225 250 275 300
Output Current(mA)
Input Voltage (V)
Output Voltage vs. Input Voltage
Output Voltage vs. Output Current
2.83
1.86
1.85
1.84
1.83
1.82
1.81
1.8
2.82
1.9
2.82
2.81
2.80
2.79
2.78
2.77
2.76
2.75
2.74
2.73
2.81
2.8
1.88
1.86
1.84
1.82
1.8
VOUT1=2.8V
2.79
2.78
2.77
2.76
2.75
2.74
2.73
2.72
VOUT1=2.8V
VOUT2=1.8V
1.78
1.76
1.74
1.72
1.7
VOUT2=1.8V
1.79
1.78
1.77
1.76
UM4750S-NR
UM4750S-NR
0
50
100
150
200
250
300
2.5
3
3.5
4
4.5
5
5.5
6
Output Current(mA)
Input Voltage(V)
Output Voltage vs. Temperature
Quiescent Current vs. Temperature
2.84
2.82
2.80
2.78
2.76
2.74
2.72
2.70
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
VIN=5.0V
VOUT1=2.8V
VOUT2=1.8V
UM4750S-NR
UM4750S-NR
-40
-20
0
20
40
60
80
100 120 140
Temperature(℃)
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Typical Performance Characteristics (Continued)
Line Transient Response
Line Transient Response
VIN=3.8V to 4.8V
(2V/div)
VIN=3.5V to 4.5V
(2V/div)
VOUT1=2.8V, IOUT1=10mA
(50mV/div)
VOUT2=1.8V, IOUT2=10mA
(50mV/div)
UM4750S-NR 100μs/div
UM4750S-NR 100μs/div
Load Transient Response
Load Transient Response
ILOAD=20mA to 220mA
(100mA/div)
ILOAD=10mA to 120mA
(50mA/div)
VIN=2.8V, VOUT2=1.8V
(200mV/div)
VIN=3.8V, VOUT1=2.8V
(100mV/div)
UM4750S-NR 100μs/div
UM4750S-NR 100μs/div
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Typical Application Circuit
VIN
VIN
VOUT1
CIN
1µF
VOUT1
VOUT2
COUT1
1µF
EN1
EN2
Chip Enable
VOUT2
COUT2
1µF
GND
Pin Function
VIN : Unregulated input supply. A small 1.0µF capacitor should be connected from VIN to GND.
GND : Ground and Heat Sink. Solder to a ground plane or large pad to maximize heat dissipation.
EN: Enable, Active High. This pin is used to put the UM4750 into shutdown. The EN pin cannot
be left floating and must be tied to the input pin if not used.
VOUT : Regulated Voltage Output.
Applications Information
The UM4750 series are 300mA very low dropout regulators with micropower quiescent current
and shutdown. The maximum dropout is only 200mV at the load current of 100mA. Output
voltage noise is as low as 200μVRMS over a 10Hz to 100kHz bandwidth.
In addition to the low quiescent current, the UM4750 regulators incorporate several protection
features which make them ideal for use in battery-powered systems. Devices include current limit
and thermal overload protection.
Output Capacitance and Transient Response
The UM4750 regulators are designed to be stable with a wide range of output capacitors. The ESR
of the output capacitor affects stability, most notably with small capacitors. A minimum output
capacitor of 1μF with an ESR of 0.3Ω or less is recommended to ensure stability. The UM4750
series are micropower devices and output transient response will be a function of output
capacitance. Larger values of output capacitance decrease the peak deviations and provide
improved transient response for larger load current changes. Extra consideration must be given to
the use of ceramic capacitors. The X5R and X7R dielectrics result in more stable characteristics
and are more suitable for use as the output capacitor. The X7R type has better stability across
temperature, while the X5R is less expensive and is available in higher values.
Board Layout Recommendations to Improve PSRR and Noise Performance
To improve AC performance such as PSRR, output noise, and transient response, it is
recommended that the board be designed with separate ground planes for VIN and VOUT, with
each ground plane connected only at the GND pin of the device. In addition, the ground
connection for the output capacitor should connect directly to the GND pin of the device. High
ESR capacitors may degrade PSRR.
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Internal Current Limit
The UM4750 internal current limits help protect the regulator during fault conditions. During
current limit, the output sources a fixed amount of current that is largely independent of output
voltage. For reliable operation, the device should not be operated in a limit state for extended
periods of time.
The PMOS pass element in the UM4750 has a built-in body diode that conducts current when the
voltage at OUT exceeds the voltage at IN. This current is not limited, so if extended reverse
voltage operation is anticipated, external limiting to 5% of rated output current may be
appropriate.
Dropout Voltage
The UM4750 use a PMOS pass transistor to achieve low dropout. When (VIN-VOUT) is less than
the dropout voltage, the PMOS pass device is in its linear region of operation and the
input-to-output resistance is the RDS of the PMOS pass element. VDROP approximately scales with
output current because the PMOS device behaves like a resistor in dropout.
Thermal Protection
Thermal protection disables the output when the junction temperature rises to approximately
+150°C allowing the device to cool. When the junction temperature cools to approximately
+120°C the output circuit is again enabled. Depending on power dissipation, thermal resistance,
and ambient temperature, the thermal protection circuit may circle on and off. This cycling limits
the dissipation of the regulator, protecting it from damage due to overheating.
Thermal Considerations
Thermal protection limits power dissipation in UM4750. When the operation junction temperature
exceeds 150°C, the OTP circuit starts the thermal shutdown function and turns the pass element
off. The pass element turns on again after the junction temperature cools by 25°C. For continuous
operation, do not exceed absolute maximum operation junction temperature 125°C. The power
dissipation definition in device is:
PD =(VIN -VOUT1)×I OUT1 + (VIN -VOUT2)×I OUT2 + VIN×I Q
The maximum power dissipation depends on the thermal resistance of IC package, PCB layout,
the rate of surroundings airflow and temperature difference between junctions to ambient. The
recommended maximum power dissipation of SOT23-6, DFN6 2.0×2.0 and DFN8 3.0×3.0
packages for 25°C ambient temperature are 0.5W, 0.7W and 0.9W.
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Package Information
UM4750S-xx SOT23-6
Outline Drawing
DIMENSIONS
MILLIMETERS
INCHES
D
Symbol
θ
b
Min
1.05
0.00
1.05
0.30
0.10
2.82
1.50
2.65
Max
1.25
0.10
1.15
0.50
0.20
3.02
1.70
2.95
Min
Max
A
A1
A2
b
c
D
E
E1
e
0.041 0.049
0.000 0.004
0.041 0.045
0.012 0.020
0.004 0.008
0.111 0.119
0.059 0.067
0.104 0.116
0.037REF
6
1
5
2
4
3
e
c
20
e1
Top View
End View
0.95REF
e1
L
1.80
2.00
0.071 0.079
0.023REF
0.60REF
L1
θ
0.30
0°
0.60
8°
0.012 0.024
Side View
0°
8°
Land Pattern
0.7
NOTES:
1. Compound dimension: 2.92×1.60；
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
0.95
0.95
4. The layout is just for reference.
Tape and Reel Orientation
XXX
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UM4750DA-xx DFN6 2.0×2.0
Outline Drawing
DIMENSIONS
MILLIMETERS
Min Typ Max
INCHES
Min Typ Max
Symbol
D2
D
0.022
0.000
-
-
0.031
0.002
A
A1
A3
b
0.57
0.00
-
-
0.80
0.05
0.008REF
0.20REF
Pin #1 ID
0.010 0.012 0.014
0.077 0.079 0.082
0.25 0.30 0.35
1.95 2.00 2.075
b
e
PIN 1 DOT
D
BY MARKING
Top View
Bottom View
0.041
0.077 0.079 0.082
-
0.069
D2
E
1.05
-
1.75
1.95 2.00 2.075
0.018
0.010
-
0.042
0.018
E2
e
L
0.45
0.25
-
1.06
0.45
Side View
0.026BSC
-
0.65BSC
-
Land Pattern
2.00
1.65
NOTES:
1. Compound dimension: 2.00×2.00;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
0.65
0.35
4. The layout is just for reference.
Tape and Reel Orientation
M
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UM4750DB-xx DFN8 3.0×3.0
Outline Drawing
DIMENSIONS
MILLIMETERS
INCHES
Min Max
Symbol
D
D2
Min
0.70
0.00
Max
0.80
0.05
A
A1
A3
b
0.028 0.031
0.000 0.002
0.008 REF
0.20REF
0.25
2.95
2.95
2.30
1.50
0.35
3.05
3.05
2.55
1.75
0.010 0.014
0.116 0.120
0.116 0.120
0.091 0.100
0.059 0.069
0.026BSC
D
e
Bottom View
b
Top View
Side View
E
D2
E2
e
0.65BSC
L
0.30
0.50
0.012 0.020
Land Pattern
NOTES:
1. Compound dimension: 3.00×3.00;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
0.65
0.35
Tape and Reel Orientation
M
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GREEN COMPLIANCE
Union Semiconductor is committed to environmental excellence in all aspects of its
operations including meeting or exceeding regulatory requirements with respect to the use
of hazardous substances. Numerous successful programs have been implemented to
reduce the use of hazardous substances and/or emissions.
All Union components are compliant with the RoHS directive, which helps to support
customers in their compliance with environmental directives. For more green compliance
information, please visit:
http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration
IMPORTANT NOTICE
The information in this document has been carefully reviewed and is believed to be
accurate. Nonetheless, this document is subject to change without notice. Union assumes
no responsibility for any inaccuracies that may be contained in this document, and makes
no commitment to update or to keep current the contained information, or to notify a
person or organization of any update. Union reserves the right to make changes, at any
time, in order to improve reliability, function or design and to attempt to supply the best
product possible.
Union Semiconductor, Inc
Add: Unit 606, No.570 Shengxia Road, Shanghai 201210
Tel: 021-51093966
Fax: 021-51026018
Website: www.union-ic.com
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