DISCONTINUED PRODUCT
— FOR REFERENCE ONLY
Designed specifically to meet the requirement for extended opera-
tion of battery-powered equipment such as cordless and cellular tele-
phones, the A8226SLM thru A8233SLM 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.
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 A8226SLM
thru A8233SLM include ENABLE inputs to give the designer complete
control over power up, standby, or power down.
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.
FEATURES AND BENEFITS
■High Efficiency Provides Extended Battery Life
■125 mV Typical Dropout Voltage at IO = 50 mA
■32 µA Typical Quiescent Current
Less Than 1 µA “Sleep” Current
■Low Output Noise
■100 mA Peak Output Current
■Improved PSRR and Transient Performance
APPLICATIONS
■Cordless and Cellular Telephones
■Personal Data Assistants
■Personal Communicators
■Palmtop Computers
LOW-DROPOUT REGULATORS
— HIGH EFFICIENCY
Data Sheet
27468.10
8226
THRU
8233
PRELIMINARY INFORMATION
(subject to change without notice)
January 18, 2000
A82xxSLM
Always order by complete part number, e.g., A82xxSLM , where “xx” is
the required output voltage in tenths.
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI. . . . . . . . . . . . . . . 7 V
Peak Output Current,
IOM . . . . . . . . . . . . . . . . . . 100 mA*
Enable Input Voltage, VE. . . . . . . . . . VI
Operating Temperature Range,
TA. . . . . . . . . . . . . -20°C to +85°C
Junction Temperature, TJ. . . . +150°C
Storage Temperature Range,
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.
Dwg. PS-021-3
VR
2
GND
3
NO
CONNECT
1
ENABLE
5
IN
OUT
4
NC
8226
THRU
8233
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
FUNCTIONAL BLOCK DIAGRAM
Copyright © 2000, Allegro MicroSystems, Inc.
A82xxSLM 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
TA1.5 2.0 2.5 3.0 3.5 4.0* 4.5*
25°C 100 100 100 100 100 100 100
50°C 100 100 100 100 100 100 100
70°C 100 100 100 100 100 91 81
85°C 100 100 100 98 84 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.
Dwg. FS-012-5B
BIAS DRIVE
ENABLE
BANDGAP
REF.
ERROR
AMP
IN
ENABLE
OUT
5 4
1
2
GND
8226
THRU
8233
LOW-DROPOUT
REGULATORS
www.allegromicro.com
ELECTRICAL CHARACTERISTICS at TA = +25°C, VE ≥ 2.0 V (unless otherwise noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Voltage VO4 V ≤ VI ≤ 7 V, 10 µA ≤ IO ≤ 50 mA* -0.05 0.00 +0.05 V
(reference specified VO(nom))VI = VO(nom), IO = 50 mA — — -0.25 V
Output Volt. Temp. Coeff. aVO VI = 6 V, IO = 10 mA, TJ ≤ 125°C — -0.20 — mV/°C
Line Regulation ∆VO(∆VI) 4 V ≤ VI ≤ 7 V, IO = 1 mA — 3.0 10 mV
Load Regulation ∆VO(∆IO) 1 mA ≤ IO ≤ 50 mA*, 4 V ≤ VI ≤ 7 V — — 20 mV
Dropout Voltage VImin - VOIO = 50 mA — 125 250 mV
Ground Terminal Current IGND VI < 7 V, IO ≤ 50 mA — 32 45 µA
IQVI ≤ 7 V, VE ≤ 0.8 V, IO = 0 mA — — 1.0 µA
ENABLE Input Voltage VEH 4 V ≤ VI ≤ 7 V, Output ON 2.0 — — V
VEL 4 V ≤ VI ≤ 7 V, Output OFF — — 0.8 V
ENABLE Input Current IEVE = VI = 7 V — — ±1.0 µA
Rejection Ratio PSRR VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA,
f = 1 kHz — 70 — dB
f = 10 kHz — 52 — dB
Output Noise en10 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.
8226
THRU
8233
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TYPICAL CHARACTERISTICS
LOAD REGULATION LINE REGULATION
0
OUTPUT CURRENT in mA
Dwg. GP-052-16
10 20 40 6030
T = -20°C
A
+0.04
V
+0.02
-0.02
OUTPUT VOLTAGE in VOLTS
-0.04
-0.06
+0.06
-0.08
50
V = 7 V
I
V = 4 V
I
O(nom)
2.0
Dwg. GP-053-17
3.0 4.0 6.0 8.05.0
T = -20°C
25 mA INTERVALS
A
I = 0 mA
O
INPUT VOLTAGE in VOLTS
I = 50 mA
O
7.0
+0.02
V
O(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
-0.03
+0.03
-0.04
0
OUTPUT CURRENT in mA
Dwg. GP-052-17
10 20 40 6030
T = 25°C
A
50
V = 4 V
I
V = 7 V
I
+0.04
V
O(nom)
+0.02
-0.02
OUTPUT VOLTAGE in VOLTS
-0.04
-0.06
+0.06
-0.08
2.0
Dwg. GP-053-18
3.0 4.0 6.0 8.05.0
T = 25°C
25 mA INTERVALS
A
I = 0 mA
O
INPUT VOLTAGE in VOLTS
7.0
I = 50 mA
O
+0.02
V
O(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
-0.03
+0.03
-0.04
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.
8226
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8233
LOW-DROPOUT
REGULATORS
www.allegromicro.com
TYPICAL CHARACTERISTICS (cont’d)
LOAD REGULATION LINE REGULATION
OUTPUT VOLTAGE
0
OUTPUT CURRENT in mA
Dwg. GP-052-15
10 20 40 6030
T = 85°C
A
V = 4 V
I
V = 7 V
I
50
+0.04
V
O(nom)
+0.02
-0.02
OUTPUT VOLTAGE in VOLTS
-0.04
-0.06
+0.06
-0.08
V = 6 V
I
2.0
Dwg. GP-053-16
3.0 4.0 6.0 8.05.0
T = 85°C
A
I = 0 mA
O
INPUT VOLTAGE in VOLTS
7.0
I = 60 mA
O
+0.02
VO(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
-0.03
+0.03
-0.04
1.0
Dwg. GP-059-3
2.0 4.0
3.0
INPUT VOLTAGE in VOLTS
0
3.0
2.0
2.5
1.5
OUTPUT VOLTAGE in VOLTS
1.0
0.5
3.5
0
I = 0 - 50 mA
O
T = 25°C
A
V
O(nom)
-50
AMBIENT TEMPERATURE in °C
Dwg. GP-050-4
0 +50 +100
V = 6 V
I = 0
I
O
V
O(nom)
+0.01
-0.01
OUTPUT VOLTAGE in VOLTS
-0.02
+0.02
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.
8226
THRU
8233
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
TYPICAL CHARACTERISTICS (cont’d)
GROUND TERMINAL/QUIESCENT CURRENT
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.
-50
AMBIENT TEMPERATURE in °C
Dwg. GP-051-4
30
0 +50
20
+100
10
QUIESCENT (GROUND TERMINAL) CURRENT in µA
40
V = 6 V
I = 0
V ≥ 2 V
I
O
E
-2.0
Dwg. GP-058-2
+2.0 +4.0
INPUT VOLTAGE in VOLTS
0
40
30
GROUND TERMINAL CURRENT in µA
60
20
10
T = 25°C
A
V
O(nom)
+6.0
50
I = 50 mA
I = 0
O
O
DROPOUT VOLTAGE
0
OUTPUT CURRENT in mA
Dwg. GP-054-3
10 20 40 6030
T = -20°C
T = 25°C
T = 85°C
A
A
A
0.20
0.10
DROPOUT VOLTAGE in VOLTS
0
50
0.25
0.15
0.05
0
Dwg. GP-071
20 40
OUTPUT CURRENT in mA
20
40
35
GROUND TERMINAL CURRENT in µA
50
30
25
60
45 V
I
≥ V
O(nom)
+ 0.30 V
T
A
= 25°C
8226
THRU
8233
LOW-DROPOUT
REGULATORS
www.allegromicro.com
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
Dwg. WP-027-3
V
O
V
E
0
0
<100 µs<150 µs
V
I
V
O(nom)
Dwg. WP-028-3
IO
50 mA
1 mA
2 µs2 µs
VO(nom)
+30 mV
-30 mV
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.
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).
APPLICATIONS INFORMATION
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.
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.
8226
THRU
8233
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
Dwg. MA-010-5 in
13
0.0059
0.0000
0.051
0.040
0.0063
0.122
0.107
0.070
0.059 0.118
0.098
0.0374
BSC
0.019
0.012
0.0748
BSC
2
54
0° TO 10°
Dwg. MA-011-5 mm
12
0.70
1.00
2.40
0.95
4
3
5
Dwg. MA-011-5 in
12
0.028
0.039
0.095
0.037
4
3
5
NOTE: Exact body and lead configuration at vendor’s option within limits shown.
Dwg. MA-010-5 mm
13
0.15
0.00
1.30
1.00
0.16
3.10
2.70
1.80
1.50 3.00
2.50
0.95
BSC
0.50
0.30
1.90
BSC
2
54
0°
TO
10°
