A8226 thru A8233: Low-Dropout Regulators -- High Efficiency

PRELIMINARY INFORMATION
LOW-DROPOUT REGULATORS
— HIGH EFFICIENCY
(subject to change without notice)
January 18, 2000
IN
OUT
A82xxSLM
5
4
Data Sheet
27468.10
8226 THRU
8233
Designed specifically to meet the requirement for extended operation of battery-powered equipment such as cordless and cellular telephones, 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. Regulated 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.
T
C
U
Y
D
L
O
N
R
P EO
D
C
E
N
U
E
N
R
I
E
T
F
N
E
O
R
C
S OR
I
D F
—
1
2
3
ENABLE
GND
NO
CONNECT
NC
VR
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 approached, 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 smalloutline 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-021-3
FEATURES AND BENEFITS
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 following pages.
■ 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
Always order by complete part number, e.g., A82xxSLM , where “xx” is
the required output voltage in tenths.
8226 THRU 8233
LOW-DROPOUT
REGULATORS
FUNCTIONAL BLOCK DIAGRAM
IN
5
4
DRIVE
ENABLE
1
ERROR
AMP
ENABLE
BIAS
2
OUT
BANDGAP
REF.
GND
Dwg. FS-012-5B
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
TA
1.5
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, Allegro MicroSystems, Inc.
8226 THRU 8233
LOW-DROPOUT
REGULATORS
ELECTRICAL CHARACTERISTICS at TA = +25°C, VE ≥ 2.0 V (unless otherwise noted).
Limits
Characteristic
Symbol
Output Voltage
VO
(reference specified VO(nom))
Output Volt. Temp. Coeff.
aVO
Test Conditions
Min.
Typ.
Max.
Units
4 V ≤ VI ≤ 7 V, 10 µA ≤ IO ≤ 50 mA*
-0.05
0.00
+0.05
V
VI = VO(nom), IO = 50 mA
—
—
-0.25
V
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 - VO
IO = 50 mA
—
125
250
mV
VI < 7 V, IO ≤ 50 mA
—
32
45
µA
VI ≤ 7 V, VE ≤ 0.8 V, IO = 0 mA
—
—
1.0
µA
VEH
4 V ≤ VI ≤ 7 V, Output ON
2.0
—
—
V
VEL
4 V ≤ VI ≤ 7 V, Output OFF
—
—
0.8
V
VE = VI = 7 V
—
—
±1.0
µA
VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA,
f = 1 kHz
f = 10 kHz
—
—
70
52
—
—
dB
dB
10 Hz ≤ f ≤ 100 kHz, IO = 10 mA, CO = 10 µF
—
0.5
—
µV/√Hz
Ground Terminal Current
IGND
IQ
ENABLE Input Voltage
ENABLE Input Current
Rejection Ratio
Output Noise
IE
PSRR
en
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
8226 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS
LINE REGULATION
+0.06
+0.03
+0.04
+0.02
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
LOAD REGULATION
+0.02
VO(nom)
VI = 4 V
-0.02
VI = 7 V
-0.04
TA = -20°C
-0.06
TA = -20°C
25 mA INTERVALS
+0.01
I O = 0 mA
V
O(nom)
I = 50 mA
-0.01
O
-0.02
-0.03
-0.04
-0.08
0
10
20
30
40
50
60
2.0
3.0
4.0
5.0
7.0
6.0
Dwg. GP-053-17
+0.06
+0.03
+0.04
+0.02
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
Dwg. GP-052-16
+0.02
VI = 7 V
V O(nom)
-0.02
V =4V
I
-0.04
TA = 25°C
-0.06
8.0
INPUT VOLTAGE in VOLTS
OUTPUT CURRENT in mA
TA = 25°C
25 mA INTERVALS
+0.01
IO = 0 mA
V O(nom)
IO = 50 mA
-0.01
-0.02
-0.03
-0.08
-0.04
0
10
20
30
40
50
60
2.0
3.0
4.0
5.0
Dwg. GP-052-17
CAUTION:
6.0
7.0
8.0
INPUT VOLTAGE in VOLTS
OUTPUT CURRENT in mA
Dwg. GP-053-18
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
8226 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS (cont’d)
LINE REGULATION
+0.06
+0.03
+0.04
+0.02
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
LOAD REGULATION
+0.02
V
O(nom)
VI = 7 V
VI = 6 V
-0.02
-0.04
VI = 4 V
+0.01
IO = 0 mA
V
O(nom)
IO = 60 mA
-0.01
-0.02
-0.03
TA = 85°C
-0.06
TA = 85°C
-0.04
-0.08
0
10
20
30
50
40
2.0
60
3.0
4.0
5.0
6.0
7.0
8.0
INPUT VOLTAGE in VOLTS
OUTPUT CURRENT in mA
Dwg. GP-053-16
Dwg. GP-052-15
OUTPUT VOLTAGE
3.5
+0.02
V O(nom)
2.5
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
3.0
2.0
1.5
I O = 0 - 50 mA
1.0
TA = 25°C
+0.01
VO(nom)
-0.01
VI = 6 V
-0.02
IO = 0
0.5
0
0
1.0
2.0
3.0
4.0
INPUT VOLTAGE in VOLTS
0
+50
+100
AMBIENT TEMPERATURE in °C
Dwg. GP-059-3
CAUTION:
-50
Dwg. GP-050-4
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
8226 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS (cont’d)
GROUND TERMINAL/QUIESCENT CURRENT
TA = 25°C
40
GROUND TERMINAL CURRENT in µA
QUIESCENT (GROUND TERMINAL) CURRENT in µA
60
VI = 6 V
IO = 0
VE ≥ 2 V
30
20
0
+100
+50
I O = 50 mA
40
30
IO = 0
20
10
0
-2.0
10
-50
50
V O(nom)
AMBIENT TEMPERATURE in °C
+2.0
+4.0
+6.0
INPUT VOLTAGE in VOLTS
Dwg. GP-058-2
Dwg. GP-051-4
DROPOUT VOLTAGE
0.25
TA = 25°C
VI ≥ VO(nom) + 0.30 V
45
0.20
DROPOUT VOLTAGE in VOLTS
GROUND TERMINAL CURRENT in µA
50
40
35
30
25
TA = 85°C
TA = 25°C
TA = -20°C
0.15
0.10
0.05
0
20
0
20
40
60
0
10
20
30
Dwg. GP-071
CAUTION:
40
50
60
OUTPUT CURRENT in mA
OUTPUT CURRENT in mA
Dwg. GP-054-3
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
8226 THRU 8233
LOW-DROPOUT
REGULATORS
TYPICAL CHARACTERISTICS (concluded)
LOAD TRANSIENT PERFORMANCE
ENABLE TRANSIENT PERFORMANCE
VI = 3.2 V to 6.2 V, CO = 4.7 µF, TA = 25°C
VI = 3.2 V to 6.2 V, CO = 1 µF, TA = 25°C
+30 mV
VO(nom)
VO(nom)
-30 mV
2 µs
2 µs
VO
0
<100 µs
<150 µs
VI
50 mA
VE
IO
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 compensation 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 recommended 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).
www.allegromicro.com
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 responsibility 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
Dimensions in Inches
(for reference only)
0.122
0.107
0.051
0.040
0.019
0.012
0.028
0.070
0.059
5
4
1
3
2
0.0063
0.118
0.098
4
5
0.039
0.0374
1
2
0° TO 10°
BSC
0.095
3
0.0748
BSC
0.037
0.0059
0.0000
Dwg. MA-010-5 in
Dwg. MA-011-5 in
Dimensions in Millimeters
(controlling dimensions)
3.10
2.70
1.30
1.00
0.50
0.30
0.70
5
1.80
1.50
5
1
4
2
3
3.00
2.50
4
1.00
0.95
2
0° TO 10°
BSC
2.40
1
0.16
3
1.90
BSC
0.95
0.15
0.00
Dwg. MA-011-5 mm
NOTE:
Dwg. MA-010-5 mm
Exact body and lead configuration at vendor’s option within limits shown.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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