A8231SLH [ALLEGRO]
LOW-DROPOUT REGULATORS . HIGH EFFICIENCY; 低压差稳压器。高效率
| 型号： | A8231SLH |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | LOW-DROPOUT REGULATORS . HIGH EFFICIENCY |
| 文件： | 总8页 (文件大小：138K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
8233 THRU
8220
PRELIMINARY INFORMATION
(subject to change without notice)
January 18, 2000
LOW-DROPOUT REGULATORS
— HIGH EFFICIENCY
Designed specifically to meet the requirement for extended opera-
tion of battery-powered equipment such as cordless and cellular tele-
phones, the A8220SLH thru A8233SLH voltage regulators offer the
reduced dropout voltage and quiescent current essential for maximum
battery life. Applicable also to palmtop computers and personal data
assistants, these devices deliver a regulated output at up to 100 mA
(transient), which is limited only by package power dissipation. Regu-
lated output voltages of 2.6, 2.7, 2.8, 2.9, 3.0 and 3.3 are currently
provided. Other voltages, down to 2.0 volts, are available on special
order.
A82xxSLH
5
4
A PMOS pass element provides a typical dropout voltage of only
125 mV at 50 mA of load current. The low dropout voltage permits
deeper battery discharge before output regulation is lost. Quiescent
current does not increase significantly as the dropout voltage is ap-
proached, an ideal feature in standby/resume power systems where data
integrity is crucial. Regulator accuracy and excellent temperature
characteristics are provided by a bandgap reference. The A8220SLH
thru A8233SLH include ENABLE inputs to give the designer complete
control over power up, standby, or power down.
VR
1
2
3
These devices are supplied in a thermally enhanced 5-lead small-
outline plastic package similar to the SOT-23, and fitting the SC-74A
footprint. All devices are rated for operation over a temperature range
of -20°C to +85°C.
Dwg. PS-021-4
FEATURES AND BENEFITS
I High Efficiency Provides Extended Battery Life
I 125 mV Typical Dropout Voltage at IO = 50 mA
I 32 µA Typical Quiescent Current
Less Than 1 µA “Sleep” Current
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . . . 7 V
Peak Output Current,
I Low Output Noise
IOM . . . . . . . . . . . . . . . . . . 100 mA*
Enable Input Voltage, VE . . . . . . . . . . VI
Operating Temperature Range,
I 100 mA Peak Output Current
I Improved PSRR and Transient Performance
TA . . . . . . . . . . . . . -20°C to +85°C
Junction Temperature, TJ . . . . +150°C
Storage Temperature Range,
APPLICATIONS
I Cordless and Cellular Telephones
I Personal Data Assistants
I Personal Communicators
I Palmtop Computers
TS . . . . . . . . . . . . -40°C to +150°C
* Output current rating is limited by input
voltage, duty cycle, and ambient temperature.
Under any set of conditions, do not exceed a
junction temperature of +150°C. See follow-
ing pages.
Always order by complete part number, e.g., A82xxSLH , where “xx” is
the required output voltage in tenths.
8220 THRU 8233
LOW-DROPOUT
REGULATORS
FUNCTIONAL BLOCK DIAGRAM
3
4
IN
OUT
DRIVE
BIAS
ERROR
AMP
1
ENABLE
BANDGAP
REF.
2
GND
Dwg. FS-012-9
A82xxSLH Maximum Allowable Average Output Current* with device mounted on 2.24" x 2.24"
(56.9 mm x 56.9 mm) solder-coated copper-clad board in still air.
Allowable Total Average (10 ms) Output Current in Milliamperes with TJ = 150°C, Duty Cycle = 100%†
VI - VO
TA
1.5
100
100
100
100
2.0
100
100
100
100
2.5
100
100
100
100
3.0
100
100
100
98
3.5
100
100
100
84
4.0*
100
100
91
4.5*
100
100
81
25°C
50°C
70°C
85°C
74
66
* Absolute maximum peak output current rating is 100 mA; absolute maximum input voltage is 7 V.
† IO = (TJ – TA)/([VI – VO] RθJA x dc) = (150 – TA)/([VI – VO] x 220 x 1.00)
Output current rating can be increased (to 100 mA maximum) by additional heat sinking or reducing the duty cycle.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, Allegro MicroSystems, Inc.
8220 THRU 8233
LOW-DROPOUT
REGULATORS
ELECTRICAL CHARACTERISTICS at TA = +25°C, VE ≥ 2.0 V (unless otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min.
-0.05
—
Typ.
Max.
+0.05
-0.25
—
Units
V
Output Voltage
VO
4 V ≤ VI ≤ 7 V, 10 µA ≤ IO ≤ 50 mA*
VI = VO(nom), IO = 50 mA
0.00
—
(reference specified VO(nom)
)
V
Output Volt. Temp. Coeff.
Line Regulation
aVO
VI = 6 V, IO = 10 mA, TJ ≤ 125°C
4 V ≤ VI ≤ 7 V, IO = 1 mA
—
-0.20
3.0
—
mV/°C
mV
mV
mV
µA
∆VO(∆VI)
∆VO(∆IO)
—
10
Load Regulation
1 mA ≤ IO ≤ 50 mA*, 4 V ≤ VI ≤ 7 V
—
20
Dropout Voltage
VImin - VO IO = 50 mA
IGND VI < 7 V, IO ≤ 50 mA
IQ
—
125
32
250
45
Ground Terminal Current
—
VI ≤ 7 V, VE ≤ 0.8 V, IO = 0 mA
4 V ≤ VI ≤ 7 V, Output ON
4 V ≤ VI ≤ 7 V, Output OFF
VE = VI = 7 V
—
—
1.0
µA
ENABLE Input Voltage
VEH
VEL
IE
2.0
—
—
—
V
—
0.8
V
ENABLE Input Current
Rejection Ratio
—
—
1.0
µA
PSRR
VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA,
f = 1 kHz
—
—
70
52
—
—
dB
dB
f = 10 kHz
Output Noise
en
10 Hz ≤ f ≤ 100 kHz, IO = 10 mA, CO = 10 µF
—
0.5
—
µV/√Hz
Typical values are at TA = +25°C and are given for circuit design information only.
* Pulse test (≤20 ms). See previous page for duty cycle limitations.
www.allegromicro.com
8220 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS
LOAD REGULATION
LINE REGULATION
+0.06
+0.04
+0.02
+0.03
+0.02
+0.01
V
T
= -20°C
A
25 mA INTERVALS
I
= 0 mA
O
V
O(nom)
V = 4 V
O(nom)
I
I
= 50 mA
-0.02
-0.04
-0.06
-0.08
-0.01
O
V = 7 V
I
-0.02
-0.03
T
= -20°C
A
-0.04
20
OUTPUT CURRENT in mA
50
7.0
0
10
30
40
60
2.0
3.0
4.0
5.0
6.0
8.0
INPUT VOLTAGE in VOLTS
Dwg. GP-052-16
Dwg. GP-053-17
+0.06
+0.04
+0.02
+0.03
+0.02
+0.01
V
T
= 25°C
A
25 mA INTERVALS
I
= 0 mA
O
V = 7 V
I
V
O(nom)
O(nom)
I
= 50 mA
O
-0.02
-0.04
-0.06
-0.08
-0.01
V = 4 V
I
-0.02
-0.03
-0.04
T
= 25°C
A
50
0
10
20
30
40
60
7.0
2.0
3.0
4.0
5.0
6.0
8.0
OUTPUT CURRENT in mA
INPUT VOLTAGE in VOLTS
Dwg. GP-052-17
Dwg. GP-053-18
CAUTION:
Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at
high output currents. See appropriate Maximum Allowable Output Current table.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8220 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION
LINE REGULATION
+0.03
+0.02
+0.01
+0.06
+0.04
+0.02
T
= 85°C
A
I
= 0 mA
O
V
V
O(nom)
O(nom)
V = 7 V
I
V = 6 V
I
= 60 mA
I
O
-0.01
-0.02
-0.03
-0.04
-0.02
-0.04
-0.06
-0.08
V = 4 V
I
T
= 85°C
A
7.0
2.0
3.0
4.0
5.0
6.0
8.0
50
0
10
20
30
40
60
INPUT VOLTAGE in VOLTS
OUTPUT CURRENT in mA
Dwg. GP-053-16
Dwg. GP-052-15
OUTPUT VOLTAGE
3.5
3.0
2.5
2.0
+0.02
V
O(nom)
+0.01
V
O(nom)
-0.01
-0.02
1.5
1.0
0.5
0
I
= 0 - 50 mA
O
V = 6 V
I
T
= 25°C
I
= 0
A
O
4.0
0
1.0
2.0
3.0
-50
0
+50
+100
INPUT VOLTAGE in VOLTS
AMBIENT TEMPERATURE in °C
Dwg. GP-050-4
Dwg. GP-059-3
CAUTION:
Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at
high output currents. See appropriate Maximum Allowable Output Current table.
www.allegromicro.com
8220 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS (cont’d)
GROUND TERMINAL/QUIESCENT CURRENT
60
T
= 25°C
A
40
50
V
I
= 6 V
= 0
I
I
= 50 mA
O
O
V
≥ 2 V
40
30
E
30
20
10
I
= 0
O
20
10
0
-2.0
V
+2.0
INPUT VOLTAGE in VOLTS
+4.0
+6.0
-50
0
+50
+100
O(nom)
AMBIENT TEMPERATURE in °C
Dwg. GP-058-2
Dwg. GP-051-4
DROPOUT VOLTAGE
50
45
40
35
30
0.25
0.20
T = 25°C
≥ VO(nom) + 0.30 V
A
VI
T
= 85°C
= 25°C
= -20°C
A
T
A
T
A
0.15
0.10
0.05
0
25
20
0
10
20
30
40
50
60
0
20
40
60
OUTPUT CURRENT in mA
OUTPUT CURRENT in mA
Dwg. GP-071
Dwg. GP-054-3
CAUTION:
Maximum allowable duty cycle will be significantly less than 100% at high temperatures, at high input voltages, or at
high output currents. See appropriate Maximum Allowable Output Current table.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8220 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS (concluded)
LOAD TRANSIENT PERFORMANCE
VI = 3.2 V to 6.2 V, CO = 4.7 µF, TA = 25°C
ENABLE TRANSIENT PERFORMANCE
VI = 3.2 V to 6.2 V, CO = 1 µF, TA = 25°C
+30 mV
V
O(nom)
V
O(nom)
-30 mV
V
2 µs
2 µs
O
0
<100 µs
<150 µs
V
I
50 mA
V
E
I
O
0
1 mA
Dwg. WP-027-3
Dwg. WP-028-3
APPLICATIONS INFORMATION
Linear regulators require input and output capacitors in order to
maintain over-all loop stability. The recommended minimum
value for the input capacitor is 0.1 µF. The output capacitor is
the dominant pole that provides the high-frequency compensa-
tion required for over-all regulator loop stability. These devices
are stable with as little as 1 µF. However, to ensure stable
operation under all conditions and capacitor types, the recom-
mended minimum value is 4.7 µF. The output capacitor may be
partially distributed through the load circuits. However, at least
1 µF should be connected at the regulator using the shortest and
widest foil pattern possible.
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Thermal Considerations
These devices are intended to provide up to 100 mA of load
current in a very small package. The table on page 2 of this data
sheet gives the maximum allowable average output current for a
worst-case printed circuit design (RθJA = 220°C/W with a
minimum footprint). Performance improvement is easily
accomplished with the addition of 1 square inch of copper at
terminal 2 (RθJA = 170°C/W).
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
www.allegromicro.com
8220 THRU 8233
LOW-DROPOUT
REGULATORS
Dimensions in Inches
(for reference only)
0.122
0.079
0.018
0.012
0.0079
0.0059
5
1
4
3
0.083
0.073
0.118
0.106
0.0098 MIN
2
0.028
0.095
5
1
4
3
0.039
0.022
0° TO 8°
REF
0.037
BSC 0.043
0.035
2
0.0059
0.00
0.049
0.035
0.037
Dwg. MA-010-15 in
Dwg. MA-011-5 in
Dimensions in Millimeters
(controlling dimensions)
3.10
2.90
0.45
0.20
0.15
0.30
5
1
4
3
2.10
1.85
3.00
2.70
0.25 MIN
2
0.70
2.40
5
1
4
3
1.00
0.55
0° TO 8°
REF
0.95
BSC
2
1.10
0.90
0.15
0.00
1.25
0.90
0.95
Dwg. MA-011-5 mm
Dwg. MA-010-15 mm
NOTES: 1. Tolerances on package height and width represent allowable mold offsets.
Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Where no tolerance is specified, dimension is nominal.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
相关型号：
©2020 ICPDF网 联系我们和版权申明