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8220 THRU 8233
PRELIMINARY INFORMATION
(subject to change without notice) February 18, 1999
Data Sheet 27468.10
LOW-DROPOUT REGULATORS -- HIGH EFFICIENCY
Designed specifically to meet the requirement for extended operation of battery-powered equipment such as cordless and cellular telephones, the A8220SLM 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. 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 A8220SLM thru A8233SLM include ENABLE inputs to give the designer complete control over power up, standby, or power down. These devices are supplied in a 5-lead SC-74A small-outline plastic package similar to the SOT-23. All devices are rated for operation over a temperature range of -20C to +85C.
A82xxSLM
IN OUT
4 VR 2
Dwg. PS-021-3
5
1
ENABLE
NO CONNECT
GND
NC
3
FEATURES AND BENEFITS
s High Efficiency Provides Extended Battery Life s 125 mV Typical Dropout Voltage at IO = 50 mA s 32 A Typical Quiescent Current Less Than 1 A "Sleep" Current s Low Output Noise s 100 mA Peak Output Current s Improved PSRR and Transient Performance
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . . . 7 V Peak Output Current, IOM . . . . . . . . . . . . . . . . . . 100 mA* Enable Input Voltage, VE . . . . . . . . . . VI Operating Temperature Range, TA . . . . . . . . . . . . . -20C to +85C Junction Temperature, TJ . . . . +150C Storage Temperature Range, TS . . . . . . . . . . . . -40C to +150C
* 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 +150C. See following pages.
APPLICATIONS
s s s s 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.
8220 THRU 8233 LOW-DROPOUT REGULATORS
FUNCTIONAL BLOCK DIAGRAM
IN
5
4
OUT
BIAS
DRIVE
ERROR AMP
ENABLE
1
ENABLE
BANDGAP REF.
2
GND
Dwg. FS-012-5
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 = 150C, Duty Cycle = 100% VI - VO TA 25C 50C 70C 85C 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 74 4.5* 100 100 81 66
*Absolute maximum peak output current rating is 100 mA; absolute maximum input voltage is 7 V. IO = (TJ - TA)/([VI - VO] RJA 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 (c) 1999, Allegro MicroSystems, Inc.
8220 THRU 8233 LOW-DROPOUT REGULATORS
ELECTRICAL CHARACTERISTICS at TA = +25C (unless otherwise noted).
Limits Characteristic Output Voltage (reference specified VO(nom)) Output Volt. Temp. Coeff. Line Regulation Load Regulation Dropout Voltage Ground Terminal Current aVO VO(VI) VO(IO) VImin - VO IGND IQ ENABLE Input Voltage VEH VEL ENABLE Input Current Rejection Ratio IE PSRR Symbol VO Test Conditions 4 V VI 7 V, 10 A IO 50 mA* VI = VO(nom), IO = 50 mA VI = 6 V, IO = 10 mA, TJ 125C 4 V VI 7 V, IO = 1 mA 1 mA IO 50 mA*, 4 V VI 7 V IO = 50 mA VI < 7 V, VE 2.0 V, IO 50 mA 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 VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA, f = 1 kHz f = 10 kHz 10 Hz f 100 kHz, IO = 10 mA, CO = 10 F Min. -0.09 -0.25 -- -- -- -- -- -- 2.0 -- -- Typ. 0.00 -- -0.20 3.0 -- 125 32 -- -- -- -- Max. +0.09 -- -- 10 20 250 45 1.0 -- 0.8 1.0 Units V V mV/C mV mV mV A A V V A
-- - --
70 52 0.5
-- -- --
dB dB V/Hz
Noise
en
Typical values are at TA = +25C and are given for circuit design information only. * Pulse test (20 ms). See previous page for duty cycle limitations.
8220 THRU 8233 LOW-DROPOUT REGULATORS
TYPICAL CHARACTERISTICS
LOAD REGULATION
+0.06
+0.03 TA = -20C 25 mA INTERVALS
LINE REGULATION
+0.04
+0.02 OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
+0.02
+0.01 I O = 0 mA
VO(nom) -0.02
VI = 4 V
V
O(nom)
-0.01
VI = 7 V -0.04 TA = -20C
IO = 50 mA
-0.02
-0.06
-0.03
-0.08 0 10 20 30 40 50 60
Dwg. GP-052-16
-0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Dwg. GP-053-17
OUTPUT CURRENT in mA
INPUT VOLTAGE in VOLTS
+0.06
+0.03 TA = 25C 25 mA INTERVALS
+0.04
+0.02
OUTPUT VOLTAGE in VOLTS
+0.02 VI = 7 V
OUTPUT VOLTAGE in VOLTS
+0.01 I = 0 mA
O
V O(nom) -0.02
V
O(nom)
I = 50 mA -0.01
O
V =4V -0.04 TA = 25C
I
-0.02
-0.06
-0.03
-0.08 0 10 20 30 40 50 60
Dwg. GP-052-17
-0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Dwg. GP-053-18
OUTPUT CURRENT in mA
INPUT VOLTAGE in VOLTS
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
+0.06
+0.03
LINE REGULATION
+0.04
+0.02 OUTPUT VOLTAGE in VOLTS
TA = 85C
OUTPUT VOLTAGE in VOLTS
+0.02
+0.01 IO = 0 mA V
O(nom)
VO(nom) -0.02
VI = 7 V V =6V
I
-0.01
IO = 60 mA
-0.04 VI = 4 V -0.06 TA = 85C
-0.02
-0.03
-0.08 0 10 20 30 40 50 60 OUTPUT CURRENT in mA
Dwg. GP-052-15
-0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Dwg. GP-053-16
INPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE
3.5
3.0
+0.02
OUTPUT VOLTAGE in VOLTS
V O(nom)
OUTPUT VOLTAGE in VOLTS
2.5
+0.01
2.0
VO(nom) -0.01 VI = 6 V IO = 0
1.5 I O = 0 - 50 mA TA = 25C
1.0
-0.02
0.5
0 0 1.0 2.0 3.0 INPUT VOLTAGE in VOLTS
4.0
-50
0
+50
+100
Dwg. GP-050-4
AMBIENT TEMPERATURE in C
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.
8220 THRU 8233 LOW-DROPOUT REGULATORS
TYPICAL CHARACTERISTICS (cont'd)
GROUND TERMINAL/QUIESCENT CURRENT
60
QUIESCENT (GROUND TERMINAL) CURRENT in A
TA = 25C
40
V =6V I I =0 O VE 2 V
GROUND TERMINAL CURRENT in A
50 I O = 50 mA 40
30
30 IO = 0 20
20
10
10 -50 0 +50 +100 AMBIENT TEMPERATURE in C
Dwg. GP-051-4
0 -2.0
V O(nom)
+2.0
+4.0
+6.0
INPUT VOLTAGE in VOLTS
Dwg. GP-058-2
DROPOUT VOLTAGE
50 TA = 25C VI VO(nom) + 0.30 V
0.25
GROUND TERMINAL CURRENT in A
45
0.20
40
DROPOUT VOLTAGE in VOLTS
0.15
TA = 85C TA = 25C TA = -20C
35
0.10
30
0.05
25
20 0 20 40 60 OUTPUT CURRENT in mA
Dwg. GP-071
0 0 10 20 30 40 50 60 OUTPUT CURRENT in mA
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 F, TA = 25C
ENABLE TRANSIENT PERFORMANCE
VI = 3.2 V to 6.2 V, CO = 1 F, TA = 25C
+30 mV VO(nom)
VO(nom)
-30 mV 2 s 2 s
VO 0 <100 s <150 s
50 mA IO 1 mA
Dwg. WP-028-3
VI VE 0
Dwg. WP-027-3
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 F. 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 F. However, to ensure stable operation under all conditions and capacitor types, the recommended minimum value is 4.7 F. The output capacitor may be partially distributed through the load circuits. However, at least 1 F 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 (RJA = 220C/W with a minimum footprint). Performance improvement is easily accomplished with the addition of 1 square inch of copper at terminal 2 (RJA = 170C/W).
8220 THRU 8233 LOW-DROPOUT REGULATORS
Dimensions in Inches
(for reference only)
0.122 0.107 0.019 0.012 0.070 0.059
5 1 2 4 3
0.051 0.040 0.0063
0.028
5 4
0.118 0.098 0.0374 0 TO 10
0.039 0.095
1 2 3
BSC
0.0748
BSC
0.037
Dwg. MA-011-5 in
0.0059 0.0000
Dwg. MA-010-5 in
Dimensions in Millimeters
(controlling dimensions)
3.10 2.70 0.50 0.30 1.80 1.50
5 1 2 4 3
1.30 1.00 0.16
0.70
5 4
3.00 2.50 0.95 0 TO 10
1.00 2.40
1 2 3
BSC
1.90
BSC
0.95
Dwg. MA-011-5 mm
0.15 0.00
Dwg. MA-010-5 mm
NOTE:
Exact body and lead configuration at vendor's option within limits shown.
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 design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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