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Datasheet> All Categories > Power/power management> The power supply circuit> A8188SLT-28
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A8188SLT-28

Description
Fixed Positive LDO Regulator, 2.8V, 0.3V Dropout, PSSO3, PLASTIC, TO-243AA, SOT-89, SO-3
CategoryPower/power management    The power supply circuit   
File Size118KB，12 Pages
ManufacturerAllegro
Websitehttp://www.allegromicro.com/
Download Datasheet Parametric Compare View All

A8188SLT-28 Overview

Fixed Positive LDO Regulator, 2.8V, 0.3V Dropout, PSSO3, PLASTIC, TO-243AA, SOT-89, SO-3

A8188SLT-28 Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerAllegro
Parts packaging codeSOT-89
package instruction, TO-243
Contacts3
Reach Compliance Codeunknown
ECCN codeEAR99
AdjustabilityFIXED
Maximum drop-back voltage 10.3 V
Nominal dropback voltage 10.19 V
Maximum absolute input voltage10 V
Maximum input voltage8 V
Minimum input voltage4 V
JESD-30 codeR-PSSO-F3
JESD-609 codee0
length4.5 mm
Maximum grid adjustment rate0.01%
Maximum load regulation0.04%
Number of functions1
Output times1
Number of terminals3
Working temperatureTJ-Max150 °C
Maximum operating temperature85 °C
Minimum operating temperature-20 °C
Maximum output current 10.1 A
Maximum output voltage 12.85 V
Minimum output voltage 12.75 V
Nominal output voltage 12.8 V
Package body materialPLASTIC/EPOXY
Encapsulate equivalent codeTO-243
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Regulator typeFIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height1.6 mm
surface mountYES
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formFLAT
Terminal pitch1.5 mm
Terminal locationSINGLE
Maximum time at peak reflow temperatureNOT SPECIFIED
Maximum voltage tolerance2%
width2.445 mm

A8188SLT-28 Preview

8188
PRELIMINARY INFORMATION
(subject to change without notice)
July 13, 1999
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 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 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 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 -20°C to +85°C.
Data Sheet
27468.8
A8188SLT-xx
VR
1
2
3
GND
Dwg. PS-022-2
where “-xx” is the required output voltage in tenths
ABSOLUTE MAXIMUM RATINGS
Input Voltage, V
I
. . . . . . . . . . . . . .
10 V
Peak Output Current,
I
OM
. . . . . . . . . . . . . . . . . .
250 mA*
Enable Input Voltage, V
E
. . . . . . . . .
V
I
Operating Temperature Range,
T
A
. . . . . . . . . . . . .
-20
°
C to +85
°
C
Junction Temperature, T
J
. . . .
+150
°
C
†
Storage Temperature Range,
T
S
. . . . . . . . . . . .
-40
°
C to +150
°
C
* Output current rating is limited by input
voltage, duty cycle, and ambient tempera-
ture. Under any set of conditions, do not
exceed a junction temperature of +150°C.
See following pages.
† Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These condi-
tions can be tolerated but should be
avoided.
OUT
IN
FEATURES AND BENEFITS
s
High Efficiency Provides Extended Battery Life
s
90 mV Typical Dropout Voltage at I
O
= 60 mA
s
55
µA
Typical Quiescent Current
Less Than 1
µA
“Sleep” Current
s
250 mA Peak Output Current
s
Improved PSRR and Transient Performance
s
Internal Thermal Protection
APPLICATIONS
s
s
s
s
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
R
θJA
108°C/W
258°C/W
where “-xx” is the required output voltage (V
O(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 © 1999, 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 T
J
= 150°C, Duty Cycle = 100%†
V
I
- V
O
T
A
25°C
50°C
70°C
85°C
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
*
†I
Absolute maximum peak output current rating for either output is 250 mA; absolute maximum input voltage is 10 V.
O
= (T
J
– T
A
)/([V
I
– V
O
] R
θJA
x dc) = (150 – T
A
)/([V
I
– V
O
] 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 T
J
= 150°C, Duty Cycle = 100%†
V
I
- V
O
T
A
25°C
50°C
70°C
85°C
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.
†I
O
= (T
J
– T
A
)/([V
I
– V
O
] R
θJA
x dc) = (150 – T
A
)/([V
I
– V
O
] 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.
8188
LOW-DROPOUT
REGULATORS
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C (unless otherwise noted).
Limits
Characteristic
Output Voltage
(reference specified V
O(nom)
)
Output Volt. Temp. Coeff.
Line Regulation
Load Regulation
a
VO
∆V
O(∆VI)
∆V
O(∆IO)
Symbol
V
O
Test Conditions
4 V
≤
V
I
≤
8 V, 10
µA ≤
I
O
≤
100 mA*
V
I
= V
O(nom)
, I
O
= 60 mA
V
I
= 6 V, I
O
= 10 mA, T
J
≤
125°C
4 V
≤
V
I
≤
8 V, I
O
= 1 mA
1 mA
≤
I
O
≤
100 mA*, V
I
= 8 V
1 mA
≤
I
O
≤
100 mA*, V
I
= 6 V
1 mA
≤
I
O
≤
100 mA*, V
I
= 4 V
Dropout Voltage
V
I
min – V
O
I
O
= 60 mA
I
O
= 125 mA*
Quiescent Current
(GND terminal current)
I
Q
V
I
= 8 V, I
O
≤
1 mA, V
E
≥
2.0 V
V
I
= 8 V, I
O
≤
100 mA*, V
E
≥
2.0 V
V
I
= V
O(nom)
, I
O
= 60 mA
I
Q(off)
ENABLE Input Voltage
V
EH
V
EL
ENABLE Input Current
Thermal Shutdown Temp.
Rejection Ratio
I
E
T
J
PSRR
V
I
= V
O(nom)
+ 1.5 V, V
i
= 100 mV, I
O
= 10 mA:
f = 1 kHz
f = 10 kHz
Noise
e
n
10 Hz
≤
f
≤
100 kHz, I
O
= 10 mA, C
O
= 10
µF
—
–
—
60
50
2.0
—
—
—
dB
dB
µV/√
Hz
4 V
≤
V
I
≤
8 V, V
E
≤
0.8 V
4 V
≤
V
I
≤
8 V, Output ON
4 V
≤
V
I
≤
8 V, Output OFF
V
E
= V
I
= 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
µA
µA
µA
µA
V
V
µA
°C
Typical values are at T
A
= +25°C 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
T
A
= -20°C
50 mA INTERVALS
+0.04
OUTPUT VOLTAGE in VOLTS
+0.02
OUTPUT VOLTAGE in VOLTS
+0.02
V
I
= 8 V
V
O(nom)
-0.02
V =4V
I
+0.01
I
O
= 0 mA
V
I
= 6 V
V
O(nom)
-0.01
I
O
= 100 mA
-0.04
T
A
= -20°C
-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
T
A
= 25°C
50 mA INTERVALS
+0.04
OUTPUT VOLTAGE in VOLTS
+0.02
OUTPUT VOLTAGE in VOLTS
+0.02
+0.01
I
O
= 0 mA
V
O(nom)
V
I
= 8 V
V
O(nom)
-0.01
-0.02
V =4V
I
I
O
= 100 mA
-0.04
T
A
= 25°C
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.
More (Only the first 5 pages are displayed. Please Download Datasheet to view the full content.) >

A8188SLT-28 Related Products

A8188SLT-28 A8188SLT-31 A8188SL-29 A8188SL-32 A8188SLT-33
Description Fixed Positive LDO Regulator, 2.8V, 0.3V Dropout, PSSO3, PLASTIC, TO-243AA, SOT-89, SO-3 Fixed Positive LDO Regulator, 3.1V, 0.3V Dropout, PSSO3, PLASTIC, TO-243AA, SOT-89, SO-3 Fixed Positive LDO Regulator, 2.9V, 0.3V Dropout, PDSO8, SOIC-8 Fixed Positive LDO Regulator, 3.2V, 0.3V Dropout, PDSO8, SOIC-8 Fixed Positive LDO Regulator, 3.3V, 0.3V Dropout, PSSO3, PLASTIC, TO-243AA, SOT-89, SO-3
Is it Rohs certified? incompatible incompatible incompatible incompatible incompatible
Maker Allegro Allegro Allegro Allegro Allegro
Parts packaging code SOT-89 SOT-89 SOIC SOIC SOT-89
package instruction , TO-243 , TO-243 SOIC-8 SOIC-8 , TO-243
Contacts 3 3 8 8 3
Reach Compliance Code unknown unknown unknown unknown unknown
ECCN code EAR99 EAR99 EAR99 EAR99 EAR99
Adjustability FIXED FIXED FIXED FIXED FIXED
Maximum drop-back voltage 1 0.3 V 0.3 V 0.3 V 0.3 V 0.3 V
Nominal dropback voltage 1 0.19 V 0.19 V 0.19 V 0.19 V 0.19 V
Maximum absolute input voltage 10 V 10 V 10 V 10 V 10 V
Maximum input voltage 8 V 8 V 8 V 8 V 8 V
Minimum input voltage 4 V 4 V 4 V 4 V 4 V
JESD-30 code R-PSSO-F3 R-PSSO-F3 R-PDSO-G8 R-PDSO-G8 R-PSSO-F3
JESD-609 code e0 e0 e0 e0 e0
length 4.5 mm 4.5 mm 4.9 mm 4.9 mm 4.5 mm
Maximum grid adjustment rate 0.01% 0.01% 0.01% 0.01% 0.01%
Maximum load regulation 0.04% 0.04% 0.04% 0.04% 0.04%
Number of functions 1 1 1 1 1
Output times 1 1 2 2 1
Number of terminals 3 3 8 8 3
Working temperatureTJ-Max 150 °C 150 °C 150 °C 150 °C 150 °C
Maximum operating temperature 85 °C 85 °C 85 °C 85 °C 85 °C
Minimum operating temperature -20 °C -20 °C -20 °C -20 °C -20 °C
Maximum output current 1 0.1 A 0.1 A 0.1 A 0.1 A 0.1 A
Maximum output voltage 1 2.85 V 3.15 V 2.95 V 3.25 V 3.35 V
Minimum output voltage 1 2.75 V 3.05 V 2.85 V 3.15 V 3.25 V
Nominal output voltage 1 2.8 V 3.1 V 2.9 V 3.2 V 3.3 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
Encapsulate equivalent code TO-243 TO-243 SOP8,.25 SOP8,.25 TO-243
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
Certification status Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
Regulator type FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height 1.6 mm 1.6 mm 1.75 mm 1.75 mm 1.6 mm
surface mount YES YES YES YES YES
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form FLAT FLAT GULL WING GULL WING FLAT
Terminal pitch 1.5 mm 1.5 mm 1.27 mm 1.27 mm 1.5 mm
Terminal location SINGLE SINGLE DUAL DUAL SINGLE
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
Maximum voltage tolerance 2% 2% 2% 2% 2%
width 2.445 mm 2.445 mm 3.9 mm 3.9 mm 2.445 mm

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