AS3815M5-4.5 [SIPEX]
Fixed Positive LDO Regulator, 4.5V, 0.35V Dropout, BIPolar, PDSO5, SOT-23, 5 PIN;型号: | AS3815M5-4.5 |
厂家: | SIPEX CORPORATION |
描述: | Fixed Positive LDO Regulator, 4.5V, 0.35V Dropout, BIPolar, PDSO5, SOT-23, 5 PIN 光电二极管 输出元件 调节器 |
文件: | 总8页 (文件大小:160K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AS3815
150 mA, Low-Noise LDO Voltage Regulator
(Preliminary Information)
FEATURES
APPLICATIONS
•
•
•
•
•
•
•
Low Noise Output LDO
•
•
•
•
•
•
•
•
•
•
PDA
1% Initial Accuracy At 150mA
Battery Powered Systems
Cellular Phone
Very Low Quiescent Current
Low Dropout Voltage (210mV At 150mA)
Current & Thermal Limiting
Cordless Telephones
Radio Control Systems
Portable/Palm Top/Notebook Computers
Portable Consumer Equipment
Portable Instrumentation
Bar Code Scanners
Reverse-Battery Protection
Wide Range of Fix Output Voltages
1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 4.0V, 4.5V, & 5.0V
Zero Off-Mode Current
•
•
•
Small 5-Pin SOT-23
SMPS Post-Regulator
Pin Compatible to MIC5205/MAX8877 (Fixed Option Only)
PRODUCT DESCRIPTION
The AS3815 is an excellent choice for use in battery-powered applications, and where power conservation is desired. Such as:
cellular/ cordless telephones, radio control systems, and portable computers.
This device is a positive voltage regulator with very low dropout voltage and low output noise. It uses very little quiescent current of
750 µA at 100 mA output load. VOUT tolerance is less than 1% with a compensated temperature coefficient. Many fixed output
voltages, as listed below, or an adjustable version are available in a small 5-pin SOT-23 package.
Other key features include: Zero off-mode current, protection against reversed battery, thermal and current limiting.
ORDERING INFORMATION
Part Number
Operating Junction
Accuracy
Package Type
Temperature Range
-40°C to +125°C
X = Output Voltage, X = 1.8 for 1.8V, 3.3 for 3.3V etc.
Blank for Adjustable
AS3815M5-X
1%
SOT-23-5
PIN CONNECTIONS
For other fixed voltages consult factory.
Top View
Top View
MARKING INFORMATION
VOUT
VOUT
ADJ/BYP
BYP
Voltage
1.8
Marking
R1XX
R2XX
R3XX
R4XX
R5XX
R6XX
Voltage
3.6
Marking
R7XX
R8XX
R9XX
RAXX
RBXX
RCXX
5
4
5
AS3815
1
4
AS3815
1
2.5
4.5
2
3
3
2
2.8
4.70
4.75
5.0
2.85
3.0
3.3
V
VIN GND EN
IN GND EN
AS3815M5-X
AS3815M5-ADJ
ADJ
Fixed Output Voltage
Adjustable Output Voltage
Rev. 10/6/00
AS3815
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
Input Voltage................................................. +2.5V to +16V
Operating Junction Temperature Range ..... -40°C to +125°C
Enable Input Voltage............................................. 0V to VIN
SOT-23-5 (θJA) ..................................................... See Note 1
Thermal Shutdown .................................... Internally Limited
Lead Temp. (Soldering, 5 Seconds) ............................ 260°C
Operating Junction Temperature Range ..... -40°C to +125°C
Input Supply Voltage........................................-20V to +20V
Enable Input Voltage........................................-20V to +20V
ELECTRICAL CHARACTERISTICS
TJ = 25°C, VIN = VOUT + 1V, IL = 100µA, CL = 1µF, and VENABLE > 2.4V. Unless otherwise specified boldface applies over the
junction temperature range
Parameter
Test Conditions
Typ
Min
Max
Units
Output Voltage Tolerance (VOUT
)
-1
+1
%VNOM
IL = 100 µA
IL = 500 µA
-2
+2
Output Voltage Temperature Coefficient
Line Regulation
57
0.03
ppm/°C
%/V
VIN = VOUT + 1V to 16V
0.1
0.2
VIN = VOUT + 1V to 16V
Load Regulation
IL = 0.1mA to 150mA
IL = 0.1mA to 150mA
IL = 100 µA
0.1
30
0.2
%
0.5
Dropout Voltage (See Note 2)
(VIN - VO)
50
70
IL = 50 mA
140
180
210
< 1
190
230
250
300
275
350
1
mV
IL = 100 mA
IL = 150 mA
VENABLE < 0.6V
Quiescent Current (IGND
)
µA
µA
VENABLE < 0.25V
5
Ground Pin Current
80
125
150
600
800
1000
1500
1900
2500
IL = 100 µA
IL = 50 mA
IL = 100 mA
IL = 150 mA
(IGND
)
350
750
1300
Ripple Rejection (PSRR)
Current Limit (ILIMIT
Output Noise (eNO
55
360
390
dB
mA
µVRMS
)
VOUT = 0V
500
)
IL = 50mA, CL = 1µF
10Hz – 100Khz.)
Input Voltage Level
Logic Low (VIL)
OFF
0.6
V
Input Voltage Level
Logic High (VIL)
ON
VIL < 0.6V
VIH > 2.0V
2.0
ENABLE Input Current
0.01
2
2
µA
20
Note 1: The maximum allowable power dissipation is a function of maximum operating junction temperature, TJ (max), the junction to ambient thermal resistance, and
the ambient, θJA, and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is given:
P
D (max) = (TJ (max) - TA)/θJA, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown.
The θJA of the AS3815 is 220oC/W mounted on a PC board.
Note 2: Not apply to 1.8V version.
Rev. 10/6/00
AS3815
TYPICAL APPLICATION
5
4
1
VIN
VOUT
+
1.0uF
2
GND
EN
AS3815
+
3
BYP
(Optn)
V
ENABLE may be tied directly to
IN
Rev. 10/6/00
AS3815
Application Hints
In general, linear regulator stability decreases with higher
output currents. In most applications the AS3815 is
operating at few milliamps. In these applications the output
capacitance can be further reduced. For example, when the
regulator is running at 10mA output current the output
capacitance value is half compared to the same regulator
that is running at 150mA.
The AS3815 requires an output capacitor for device stability.
The value required varies greatly depending upon the
application circuit. The high frequency characteristics of
electrolytic capacitors depend greatly on the type and also on
the manufacturer. Sometimes bench testing is the only means
to determine the proper capacitor type and value. The high
quality 2.2µF aluminum electrolytic capacitor covers all
general application circuits; this stability can be obtained with
a tantalum electrolytic value of 1µF.
With the AS3815 adjustable regulator, the minimum value
of output capacitance is a function of the output voltage.
The value decreases with higher output voltages, since the
closed loop gain is increased.
Typical Applications Circuits
The AS3815 provides access to the internal reference. A 10µF capacitor on the BYP pin will provide a significant reduction in output
noise. This pin may be left unconnected if the output noise is not a major concern. The AS3815 start-up speed is inversely
proportional to the size of this capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of
CBYP. If the rapid turn-ON is necessary, omit bypass capacitor.
Figure 1 shows AS3815 standard application circuit. The EN pin is pulled high (>2.0V) to enable the regulator. To disable the
regulator, EN < 0.6V.
VIN
VOUT
5
1
+
2
GND
EN
AS3815
+
4
BYP
3
(Optn)
Hi-ON
Lo-OFF
Fig. 1
Top View
The AS3815 in figure 2 shows adjustable output voltage configuration. Two resistors set the output voltage. The formula for output
voltage is:
R1
VOUT = 1.235 x 1+
R2
Resistor values are not critical as the ADJ pin has high input impedance, for best results use resistors of 47kΩ or less. A capacitor
from ADJ to ground will provide improved noise performance.
1
5
VIN
VOUT
2
+
GND
EN
R1
R2
+
AS3815
4
3
ADJ
Byp
Hi-ON
(Optn)
Lo-OFF
Top View
Fig. 2
Rev. 10/6/00
AS3815
PACKAGE DRAWING
SOT-23-5L (M5)
D
B (5 PLACES)
H
E
e
e1
A
A2
C
A1
L
INCHES
MILLIMETERS
NOTE:
1. REFER TO APPLICABLE
MIN.
0.90
0
MAX
1.30
0.10
MIN.
MAX.
A
A1
A2
B
.035
0
.051
.004
2. CONTROLLING DIMENTION : MILLIMETER
3. PACKAGE SURFACE FINISHING TO BE SMOOTH
FINISH.
0.80 REF
.0315 REF
0.30
0.10
2.70
1.40
0.50
0.35
3.10
1.80
.012
.004
.106
.055
.019
.0137
.122
C
D
E
.071
e
.037 BSC.
0.95 BSC.
e1
H
L
1.70
2.50
2.10
3.00
.066
.098
.082
.118
MIN 0.2
MIN .0078
Rev. 10/6/00
AS3815
Ground Current Vs. Load Current
Ground Current Vs. Input Voltage
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
110
100
90
80
70
60
Vo = 3.3V
IL = 100uA
CL = 1uF
50
3.3V Device
Vin = 4.3V
CL=1uF
40
30
0
50
100
150
150
150
4
6
8
10
Vin (V)
12
14
16
IL (mA)
Ground Current Vs. Load Current
(in Dropout)
Output Voltage Vs. Input Voltage
3.340
3.335
3.330
3.325
3.320
3.315
3.310
3.305
3.300
3.295
3.290
2.00
1.50
1.00
0.50
0.00
3.3V Device
IL = 100uA
CL = 1uF
3.3V Device
Vin = 4.3V
CL = 1uF
0
50
100
4
6
8
10
Vin (V)
12
14
16
IL (mA)
Dropout Voltage Vs. Load Current
Output Voltage Vs. Load Current
3.310
3.308
3.306
3.304
3.302
3.300
200
150
100
50
3.3V Device
Vin = 4.3V
CL = 1uF
Vin = 4.3V
Vo = 3.3V
CL = 1uF
0
0
50
100
0
50
100
150
IL ( mA)
IL ( mA)
Rev. 10/6/00
AS3815
Ground Current Vs. Temperature
Ground Current Vs. Temperature
90.0
80.0
70.0
60.0
50.0
950
850
750
650
550
450
Vin = 4.3V
Vout = 3.3V
CL = 1uF
IL = 100uA
Vin = 4.3V
Vout = 3.3V
CL= 1uF
IL = 100mA
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (Degree C)
Temperature (Degree C)
Ground Current in Dropout Vs. Temperature
Output Voltage Vs Temperature
3.400
3.380
3.360
3.340
3.320
3.300
3.280
3.260
3.240
3.220
3.200
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
1.50
1.40
Vin = 4.3V
Vout = 3.3V
CL = 1uF
Vin = 4.3V
Vout = 3.3V
CL = 1uF
IL = 150mA
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
Temperature (Degree C)
Temperature (Degree C)
Enable Voltage, On Threshold Vs. Input Voltage
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.90
0.80
Vout = 3.3V
IL = 100uA
CL = 1uF
4
6
8
10
12
14
16
Vin (V)
Rev. 10/6/00
AS3815
Rev. 10/6/00
相关型号:
AS3819S1
Adjustable Positive LDO Regulator, 1.24V Min, 15V Max, 0.7V Dropout, BIPolar, PDSO8, SOIC-8
SIPEX
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