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8188
PRELIMINARY INFORMATION
(subject to change without notice) July 13, 1999
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 A8188S-- 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 250 mA (transient), which is limited only by package power dissipation. Regulated output voltages between 2.5 V and 3.3 V are trimmed at wafer probe. A PMOS pass element provides a typical dropout voltage of only 90 mV at 60 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 A8188SL-xx includes ENABLE inputs to give the designer complete control over power up, standby, or power down. These devices are supplied, without the ENABLE function, in a standard 3-lead SOT-89/TO-243AA small-outline plastic transistor package (suffix `LT'). Dual regulators (A8188SL-xx) are provided in an 8-lead SOIC package. All devices are rated for operation over a temperature range of -20C to +85C.
Data Sheet 27468.8
A8188SLT-xx
where "-xx" is the required output voltage in tenths
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . . 10 V Peak Output Current, IOM . . . . . . . . . . . . . . . . . . 250 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. Fault conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided.
T C UY DL ON RO PE DC EN UE IN ER TF NE OR CR IS O DF --
VR 1 2 3
GND
Dwg. PS-022-2
OUT
IN
FEATURES AND BENEFITS
I High Efficiency Provides Extended Battery Life I 90 mV Typical Dropout Voltage at IO = 60 mA I 55 A Typical Quiescent Current Less Than 1 A "Sleep" Current I 250 mA Peak Output Current I Improved PSRR and Transient Performance I Internal Thermal Protection
APPLICATIONS
I I I I
Cordless and Cellular Telephones Personal Data Assistants Personal Communicators Palmtop Computers
Always order by complete part number, e.g., A8188SLT-30 .
8188 LOW-DROPOUT REGULATORS
FUNCTIONAL BLOCK DIAGRAM
(1/2 of A8188SL-xx shown)
IN
8
1
OUT
BIAS
DRIVE
ERROR AMP
ENABLE
7
ENABLE
BANDGAP REF.
2
GND
Dwg. FS-012-8
Always order by complete part number:
Part Number A8188SL-xx A8188SLT-xx Package 8-Lead SOIC 3-Lead SOT-89/TO-243AA RJA 108C/W 258C/W
where "-xx" is the required output voltage (VO(nom)) in tenths (25 through 33), e.g., -30 = 3.0 volts.
OUT 1 GND 1
A8188SL-xx
8 VR 7 6 VR 5
IN
1 1
1
2 3 4
ENABLE IN
OUT 2 GND 2
2
ENABLE 2
Dwg. PS-023
NOTE -- There is an indeterminate resistance between terminals 2 and 4. For proper operation, terminals 2 and 4 must be externally connected together.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1999, 2000 Allegro MicroSystems, Inc.
8188 LOW-DROPOUT REGULATORS
A8188SL-xx Maximum Allowable Total 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 1.0 500 500 500 500 1.5 500 500 490 400 2.0 500 460 370 300 2.5 460 370 295 240 3.0 385 305 245 200 4.0 285 230 185 150 5 .0 230 185 145 120 6.0 190 150 120 100 7.0* 165 130 105 85
* Absolute maximum peak output current rating for either output is 250 mA; absolute maximum input voltage is 10 V. IO = (TJ - TA)/([VI - VO] RJA x dc) = (150 - TA)/([VI - VO] x 108 x 1.00) Output current rating can be increased (to 250 mA maximum per output) by additional heat sinking or reducing the duty cycle. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided.
A8188SLT-xx Maximum Allowable 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 Average (10 ms) Output Current in Milliamperes with TJ = 150C, Duty Cycle = 100% VI - VO TA 25C 50C 70C 85C 1.0 250 250 250 250 1.5 250 250 205 165 2.0 240 190 155 125 2.5 190 155 120 100 3.0 160 125 100 80 4.0 120 95 75 60 5.0 95 75 60 50 6.0 80 65 50 40 7.0* 65 55 40 35
* Absolute maximum input voltage is 10 V. IO = (TJ - TA)/([VI - VO] RJA x dc) = (150 - TA)/([VI - VO] x 258 x 1.00) Output current rating can be increased (to 250 mA maximum) by additional heat sinking or reducing the duty cycle. Conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated but should be avoided.
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8188 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 aVO VO(VI) VO(IO) Symbol VO Test Conditions 4 V VI 8 V, 10 A IO 100 mA* VI = VO(nom), IO = 60 mA VI = 6 V, IO = 10 mA, TJ 125C 4 V VI 8 V, IO = 1 mA 1 mA IO 100 mA*, VI = 8 V 1 mA IO 100 mA*, VI = 6 V 1 mA IO 100 mA*, VI = 4 V Dropout Voltage VImin - VO IO = 60 mA IO = 125 mA* Quiescent Current (GND terminal current) IQ VI = 8 V, IO 1 mA, VE 2.0 V VI = 8 V, IO 100 mA*, VE 2.0 V VI = VO(nom), IO = 60 mA IQ(off) ENABLE Input Voltage VEH VEL ENABLE Input Current Thermal Shutdown Temp. Rejection Ratio IE TJ PSRR VI = VO(nom) + 1.5 V, Vi = 100 mV, IO = 10 mA: f = 1 kHz f = 10 kHz Noise en 10 Hz f 100 kHz, IO = 10 mA, CO = 10 F -- - -- 60 50 2.0 -- -- -- dB dB V/Hz 4 V VI 8 V, VE 0.8 V 4 V VI 8 V, Output ON 4 V VI 8 V, Output OFF VE = VI = 8 V Min. -0.05 -0.30 -- -- -- -- -- -- -- -- -- -- -- 2.0 -- -- 150 Typ. 0.00 -- -0.30 -- -- -- -- 90 190 55 70 200 -- -- -- -- -- Max. +0.05 -- -- 10 40 40 40 150 300 70 85 -- 1.0 -- 0.8 1.0 -- Units V V mV/C mV mV mV mV mV mV A A A A V V A C
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.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
8188 LOW-DROPOUT REGULATORS
TYPICAL CHARACTERISTICS LOAD REGULATION
+0.06
LINE REGULATION
+0.03 TA = -20C 50 mA INTERVALS
+0.04
OUTPUT VOLTAGE in VOLTS
+0.02
OUTPUT VOLTAGE in VOLTS
+0.02 VI = 8 V VO(nom) -0.02 V =4V
I
+0.01 I O = 0 mA
VI = 6 V
VO(nom) -0.01 IO = 100 mA
-0.04 TA = -20C
-0.02
-0.06
-0.03
-0.08 0 25 50 75 100 125 150
Dwg. GP-052-13
-0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Dwg. GP-053-13
OUTPUT CURRENT in mA
INPUT VOLTAGE in VOLTS
+0.06
+0.03 TA = 25C 50 mA INTERVALS
+0.04
OUTPUT VOLTAGE in VOLTS
+0.02
OUTPUT VOLTAGE in VOLTS
+0.02
+0.01 IO = 0 mA
V
O(nom)
VI = 8 V
V O(nom) -0.01
-0.02 V =4V
I
I = 100 mA
O
-0.04 TA = 25C 2 V INTERVALS
-0.02
-0.06
-0.03
-0.08 0 25 50 75 100 125 150
Dwg. GP-052-14
-0.04 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Dwg. GP-053-14
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.
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8188 LOW-DROPOUT REGULATORS
TYPICAL CHARACTERISTICS (cont'd) LOAD REGULATION
+0.06
LINE REGULATION
+0.03 TA = 85C 50 mA INTERVALS
+0.04
+0.02
OUTPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE in VOLTS
+0.02
+0.01
V
O(nom)
V
VI = 7 V VI = 6 V
O(nom)
IO = 0 mA -0.01
-0.02
-0.04 VI = 4 V -0.06 TA = 85C
-0.02
IO = 100 mA
-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-053-15
INPUT VOLTAGE in VOLTS
OUTPUT VOLTAGE
3.5
3.0
V O(nom)
OUTPUT VOLTAGE in VOLTS
+0.01 VI = 6 V IO = 0
OUTPUT VOLTAGE in VOLTS
2.5
2.0
VO(nom) -0.01
1.5 I O = 0 - 100 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-050-3
AMBIENT TEMPERATURE in C
Dwg. GP-059-2
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
8188 LOW-DROPOUT REGULATORS
TYPICAL CHARACTERISTICS (cont'd) QUIESCENT (GROUND TERMINAL) CURRENT
250
QUIESCENT (GROUND TERMINAL) CURRENT in A
60
VI = 6 V I O VE 2 V =0
QUIESCENT (GROUND TERMINAL) CURRENT in A
200 IO = 0 TA = 25C 150
55
100
50
50
45 -50 0 +50 +100 AMBIENT TEMPERATURE in C
Dwg. GP-051-3
0 -2.0
V O(nom)
+2.0
+4.0
+6.0
INPUT VOLTAGE in VOLTS
Dwg. GP-058-1
DROPOUT VOLTAGE
0.25
0.20
DROPOUT VOLTAGE in VOLTS
0.15
TA = 85C TA = 25C TA = -20C
0.10
0.05
0 0 25 50 75 100 125 150 OUTPUT CURRENT in mA
Dwg. GP-054-2
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.
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8188 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
+0.1 V VO(nom) -0.1 V 15 s 5 s
VO 0 <100 s <150 s VO(nom)
100 mA IO 1 mA
Dwg. WP-028-2
VI VE 0
Dwg. WP-027-3
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
8188 LOW-DROPOUT REGULATORS
A8188SL-xx
Dimensions in Inches (for reference only)
8 0.0098 0.0075
0.1574 0.1497
0.2440 0.2284
0.050 0.016
0.020 0.013
1 0.1968 0.1890
0.050
BSC
0 TO 8
0.0688 0.0532 0.0040 MIN.
Dwg. MA-007-8 in
Dimensions in Millimeters (controlling dimensions)
8 0.25 0.19 6.20 5.80
4.00 3.80
1.27 0.40
0.51 0.33
1 5.00 4.80
1.27
BSC
0 TO 8
1.75 1.35 0.10 MIN.
Dwg. MA-007-8 mm
NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor's option within limits shown.
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8188 LOW-DROPOUT REGULATORS
A8188SLT-xx
Dimensions in Inches (for reference only)
0.173 0.181 0.064 0.072 0.155 0.167 0.090 0.102 0.055 0.063
0.014 0.017
1
2
3
0.084 0.090
0.035 0.047 0.059
BSC
0.014 0.019 0.017 0.022 0.118
BSC
Dwg. MA-009-3 in
Dimensions in Millimeters (controlling dimensions)
4.40 4.60 1.62 1.83 3.94 4.25 2.29 2.60 1.40 1.60
0.35 0.44
1
2
3
2.13 2.29
0.89 1.20 1.50
BSC
0.36 0.48 0.44 0.56 3.00
BSC
Dwg. MA-009-3 mm
NOTES: 1. Lead spacing tolerance is non-cumulative. 2. Exact body and lead configuration at vendor's option within limits shown.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
8188 LOW-DROPOUT REGULATORS
this page is intentionally left blank
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8188 LOW-DROPOUT REGULATORS
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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