Analog Microelectronics, Inc.
1
AME8804
300mA CMOS LDO
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Typical Application
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Functional Block Diagram
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Features
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Very Low Dropout Voltage
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Guaranteed 300mA Output
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Accurate to within 1.5%
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30
µ
A Quiescent Current
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Over-Temperature Shutdown
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Current Limiting
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Short Circuit Current Fold-back
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Power Good Detector (6 pin version only)
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Power-Saving Shutdown Mode
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Space-Saving SOT-26 and SOT-25
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Adjustable Output Voltages
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Low Temperature Coefficient
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General Description
The AME8804 family of positive, linear regulators fea-
ture low quiescent current (30
µ
A typ.) with low dropout
voltage, making them ideal for battery applications. The
space-saving SOT-26 and SOT-25 packages are attrac-
tive for "Pocket" and "Hand Held" applications.
These rugged devices have both Thermal Shutdown,
and Current Fold-back to prevent device failure under
the "Worst" of operating conditions.
The SOT-26 version also features a "Power Good" de-
tector, which pulls low when the output is out of regula-
tion.
The AME8804 is stable with an output capacitance of
2.2
µ
F or greater.
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Applications
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Instrumentation
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Portable Electronics
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Wireless Devices
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Cordless Phones
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PC Peripherals
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Battery Powered Widgets
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Electronic Scales
A M P
G N D
O U T
IN
A D J
P G
Overcurrent
Shutdown
Thermal
Shutdown
E N
V
ref
=1.215V
V
ref
x90%
V
ref
x110%
AME8804
O U T
IN
C 3
2.2
µ
F
G N D
A D J
5 V
O U T
IN
E N
C 2
100p
R 1
R 2
C 1
1
µ
F
P G
V
OUT
= 1.215 (R1 +R2)/R2
C2 is unnecessary when R1 or R2 < 20K
PG pin is only available in the SOT-26 package option
Analog Microelectronics, Inc.
2
300mA CMOS LDO
AME8804
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Pin Configuration
SOT-26 Top View
1. V
IN
4. PG
2. GND
5. ADJ
3. EN
6. V
OUT
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Ordering Information
1. V
IN
4. ADJ
2. GND
5. V
OUT
3. EN
SOT-25 Top View
4
5
1
2
3
4
5
1
2
3
6
Part Number
Marking Output Voltage Package
Operating Temp. Range
AME8804AEEY
AAUww
Adjustable
SOT-26
-40
O
C to +85
O
C
AME8804AEEV
AJCww
Adjustable
SOT-25
-40
O
C to +85
O
C
Please consult AME sales office or authorized Rep./Distributor for other package type availability.
Analog Microelectronics, Inc.
3
AME8804
300mA CMOS LDO
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Absolute Maximum Ratings
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Recommended Operating Conditions
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Thermal Information
Caution: Stress above the listed absolute rating may cause permanent damage to the device
Parameter
Maximum
Unit
Input Voltage
8
V
Output Current
P
D
/ (V
IN
- V
O
)
mA
Input, Output Voltage
GND - 0.3 to V
IN
+ 0.3
V
ESD Classification
B
Parameter
Rating
Unit
Ambient Temperature Range
- 40 to +85
o
C
Junction Temperature
- 40 to +125
o
C
Maximum
Unit
Thermal Resistance (
ja
)
SOT-25
260
o
C / W
Internal Power Dissipation (P
D
)
(
T = 100
o
C)
SOT-25
380
mW
Thermal Resistance (
ja
)
SOT-26
260
o
C / W
Internal Power Dissipation (P
D
)
(
T = 100
o
C)
SOT-26
380
mW
150
o
C
300
o
C
Maximum Lead Temperature ( 10 Sec)
Maximum Junction Temperature
Parameter
Analog Microelectronics, Inc.
4
300mA CMOS LDO
AME8804
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Electrical Specifications
TA = 25
0
C V
IN
=5V unless otherwise noted
Parameter
Symbol
Min
Typ
Max
Units
Input Voltage
V
IN
Note 1
7
V
Output Voltage Accuracy
V
O
-1.5
1.5
%
1.5V<V
O(N OM)
<=2.0V
1300
Dropout Voltage
V
DROPOUT
2.0V<V
O(N OM)
<=2.8V
400
2.8V<V
O(N OM)
<3.8V
300
Output Current
I
O
300
mA
Current Limit
I
LIM
300
450
mA
Short Circuit Current
I
SC
150
300
mA
Quiescent Current
I
Q
30
50
µ
A
Ground Pin Current
I
GND
35
µ
A
V
O
< 2.0V
0.15
%
V
O
>= 2.0V
0.02
0.1
%
Load Regulation
REG
LOAD
0.2
1
%
Over Temerature Shutdown
OTS
150
o
C
Over Temerature Hysterisis
OTH
30
o
C
V
O
Temperature Coefficient
TC
30
ppm/
o
C
f=1kHz
50
PSRR
f=10kHz
20
dB
f=100kHz
15
ADJ Input Bias Current
I
AD J
1
µ
A
ADJ Reference Voltage
V
REF
1.203
1.215
1.227
V
V
EH
2.0
Vin
V
V
EL
0
0.4
V
I
EH
0.1
µ
A
I
EL
0.5
µ
A
Shutdown Supply Current
I
SD
0.5
1
µ
A
Shutdown Output Voltage
V
O
,
SD
0
0.1
V
Output Under Voltage
V
UV
85
%V
O(N OM)
Output Over Voltage
V
OV
115
%V
O(N OM)
PG Leakage Current
I
LC
1
µ
A
PG Voltage Rating
V
PG
7
V
PG Voltage Low
V
OL
0.4
V
Note1:V
IN(min)
=V
OUT
+V
DROPOUT
I
SINK
=0.4mA
Co=2.2
µ
F
30
V
PG
=7V
V
O
in regulation
I
O
=35
µ
A,V
EN
<V
EL
µ
Vrms
V
IN
=5V, V
O
=0V, V
EN
<V
EL
EN Input Threshold
V
IN
=2.7V to 7V
V
IN
=2.7V to 7V
EN Input Bias Current
V
EN
=V
IN
, V
IN
=2.7V to 7V
V
EN
=0V, V
IN
=2.7V to 7V
Output Voltage Noise
eN
f=10Hz to 100kHz
I
O
=10mA,C
BY P
=0
µ
F
Power Supply Rejection
I
O
=100mA
C
O
=2.2
µ
F
Line Regulation
REG
LINE
I
O
=5mA
V
IN
=V
O
+1 to V
O
+2
I
O
=1mA to 300mA
V
O
>1.2V
V
O
<0.8V
I
O
=0mA
I
O
=1mA to 300mA
I
O
=300mA
V
O
=V
ONOM
-2.0%
See
chart
mV
V
O
>1.2V
Test Condition
I
O
=1mA
Analog Microelectronics, Inc.
5
AME8804
300mA CMOS LDO
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Detailed Description
The AME8804 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error ampli-
fier, over-current protection, thermal shutdown, and
Power Good detection circuitry.
The P-channel pass transistor receives data from the
error amplifier, over-current shutdown, and thermal pro-
tection circuits. During normal operation, the error am-
plifier compares the output voltage to a precision refer-
ence. Over-current and Thermal shutdown circuits be-
come active when the junction temperature exceeds
150
o
C, or the current exceeds 300mA. During thermal
shutdown, the output voltage remains low. Normal op-
eration is restored when the junction temperature drops
below 120
o
C.
The AME8804 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress. The AME8804 also incor-
porates current foldback to reduce power dissipation
when the output is short circuited. This feature becomes
active when the output drops below 0.8volts, and re-
duces the current flow by 65%. Full current is restored
when the voltage exceeds 0.8 volts.
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Enable
The Enable pin normally floats high. When actively,
pulled low, the PMOS pass transistor shuts off, and all
internal circuits are powered down. In this state, the
quiescent current is less than 1
µ
A. This pin behaves
much like an electronic switch.
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Power Good
The AME8804 (SOT-26 package only) includes the Power
Good feature. Normally, Pin 4 is "Floating", however,
when the output is not within
±
10% of the specified volt-
age, it pulls low. This can occur under the following con-
ditions:
1) Input Voltage too low.
2) During Over-Temperature.
3) During Over-Current.
4) If output is pulled up.
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External Capacitors
The AME8804 is stable with an output capacitor to
ground of 2.2
µ
F or greater. Ceramic capacitors have
the lowest ESR, and will offer the best AC performance.
Conversely, Aluminum Electrolytic capacitors exhibit
the highest ESR, resulting in the poorest AC response.
Unfortunately, large value ceramic capacitors are com-
paratively expensive. One option is to parallel a 0.1
µ
F
ceramic capacitor with a 10
µ
F Aluminum Electrolytic.
The benefit is low ESR, high capacitance, and low over-
all cost.
A second capacitor is recommended between the input
and ground to stabilize Vin. The input capacitor should
be at least 0.1
µ
F to have a beneficial effect.
All capacitors should be placed in close proximity to
the pins. A "Quiet" ground termination is desirable.
This can be achieved with a "Star" connection.
Analog Microelectronics, Inc.
6
300mA CMOS LDO
AME8804
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50
100
150
200
250
300
2.5
2.75
3
3.25
3.5
3.75
4
Drop Out Voltage vs Output Voltage
Output Voltage (V)
Drop Out Voltage (mV)
I
L O A D
= 3 0 0 m A
I
L O A D
= 2 0 0 m A
I
L O A D
= 1 0 0 m A
0
50
100
150
200
250
0
50
100
150
200
250
300
Drop Out Voltage vs Load Current
Load Current (mA)
Dropout Voltage (mV)
Top to bottom
V
O U T
=2.5V
V
O U T
=2.8V
V
O U T
=3.0V
V
O U T
=3.3V
V
O U T
=3.5V
V
O U T
=3.8V
0
0
Chip Enable Transient Response
TIME ( 1mS/DIV)
C
L
=2
µ
F
R
L
=10
Output (1V/DIV) Enable (2V/DIV)
0
5
10
15
20
25
30
35
40
45
0
1
2
3
4
5
6
7
8
Ground Current vs. Input Voltage
Ground Current (
µ
µ
µ
µ
A)
Input Voltage (V)
85
O
C
25
O
C
-80
-70
-60
-50
-40
-30
-20
-10
0
1.0E+01
1.0E+03
1.0E+05
1.0E+07
Power Supply Rejection Ratio
PSRR (dB)
Frequency (Hz)
1 0 0 m A
1 0 m A
1 m A
100
µ
A
1 0 0 m A
100
µ
A
C
L
=2.2
µ
F Tantalum
C
B Y P
=0
Load Step ( 1mA-300mA)
I
L
(200mA/DIV) Vo(5mV/DIV)
TIME( 20mS/DIV)
C
L
=2.2
µ
F
C
I N
=2.2
µ
F
Output
I
L o a d
0
Analog Microelectronics, Inc.
7
AME8804
300mA CMOS LDO
Line Transient Response
V
OUT
(10mV/DIV) V
IN
(1V/DIV)
C
L O A D
=2.2
µ
F
I
L O A D
= 1 m A
V
O U T D C
=3.3V
V
I N D C
=4.5V
TIME (200mS/DIV)
Noise Measurement
TIME (20mS/DIV)
Vo (1mV/ DIV)
Short Circuit Response
TIME (2mS/DIV)
V
OUT
(1V/DIV) I
LOAD
(400mA/DIV)
R
L O A D
=100
R
S H O R T
=0.1
0
0
10
100
300
0.1
1.0
8.0
Safe Operating Area
Output Current (mA)
Input-Output Voltage Differential (V)
S O T - 2 5
S O T - 2 6
Overtemperature Shutdown
V
OUT
(1V/DIV) I
OUT
(200mA/DIV)
TIME (0.5Sec/DIV)
R
L O A D
=6.6
0
0
Current Limit Response
V
OUT
(1V/DIV) I
OUT
(200mA/DIV)
TIME (2mS/DIV)
R
L O A D
=3.3
0
0
Analog Microelectronics, Inc.
8
300mA CMOS LDO
AME8804
0.01
0.1
1
10
100
1000
10000
0
50
100
150
200
ESR (
)
Stable Region
Untested Region
Unstable Region
ILOAD (mA)
C
L
= 1
µ
F
Stability vs. ESR vs I
LOAD
0.01
0.1
1
10
100
1000
10000
0
50
100
150
200
Stable Region
Untested Region
Unstable Region
ILOAD (mA)
ESR (
)
C
L
=3
µ
F
Stability vs. ESR vs I
LOAD
0.001
0.01
0.1
1
10
100
1000
10000
0
50
100
150
200
Stable Region
Untested Region
Unstable Region
ILOAD (mA)
ESR (
)
C
L
=10
µ
F
Stability vs. ESR vs I
LOAD
0.01
0.1
1
10
100
1000
10000
0
50
100
150
200
ILOAD (mA)
Stable Region
Untested Region
Unstable Region
ESR (
)
C
L
= 2
µ
F
Stability vs. ESR vs I
LOAD
Analog Microelectronics, Inc.
9
AME8804
300mA CMOS LDO
R1(kohm)
1.00
2.00
5.00
10.00
20.00
50.00
100.00
200.00
500.00 1000.00
Vout
1.30
14.29
28.59
71.47
142.94
285.88
714.71
1.35
9.00
18.00
45.00
90.00
180.00
450.00
1.40
6.57
13.14
32.84
65.68
131.35
328.38
1.45
5.17
10.34
25.85
51.70
103.40
258.51
517.02
1.50
4.26
8.53
21.32
42.63
85.26
213.16
426.32
852.63
1.55
3.63
7.25
18.13
36.27
72.54
181.34
362.69
725.37
1.60
3.16
6.31
15.78
31.56
63.12
157.79
315.58
631.17
1.65
2.79
5.59
13.97
27.93
55.86
139.66
279.31
558.62
1.70
2.51
5.01
12.53
25.05
50.10
125.26
250.52
501.03
1.75
2.27
4.54
11.36
22.71
45.42
113.55
227.10
454.21
1.80
2.08
4.15
10.38
20.77
41.54
103.85
207.69
415.38
1.85
1.91
3.83
9.57
19.13
38.27
95.67
191.34
382.68
1.90
1.77
3.55
8.87
17.74
35.47
88.69
177.37
354.74
1.95
1.65
3.31
8.27
16.53
33.06
82.65
165.31
330.61
826.53
2.00
1.55
3.10
7.74
15.48
30.96
77.39
154.78
309.55
773.89
2.05
1.46
2.91
7.28
14.55
29.10
72.75
145.51
291.02
727.54
2.10
1.37
2.75
6.86
13.73
27.46
68.64
137.29
274.58
686.44
2.15
1.30
2.60
6.50
12.99
25.99
64.97
129.95
259.89
649.73
2.20
1.23
2.47
6.17
12.34
24.67
61.68
123.35
246.70
616.75
2.25
1.17
2.35
5.87
11.74
23.48
58.70
117.39
234.78
586.96
2.30
1.12
2.24
5.60
11.20
22.40
55.99
111.98
223.96
559.91
2.35
1.07
2.14
5.35
10.70
21.41
53.52
107.05
214.10
535.24
2.40
1.03
2.05
5.13
10.25
20.51
51.27
102.53
205.06
512.66
2.45
0.98
1.97
4.92
9.84
19.68
49.19
98.38
196.76
491.90
2.50
0.95
1.89
4.73
9.46
18.91
47.28
94.55
189.11
472.76
2.55
0.91
1.82
4.55
9.10
18.20
45.51
91.01
182.02
455.06
2.60
0.88
1.75
4.39
8.77
17.55
43.86
87.73
175.45
438.63
877.26
2.65
0.85
1.69
4.23
8.47
16.93
42.33
84.67
169.34
423.34
846.69
2.70
0.82
1.64
4.09
8.18
16.36
40.91
81.82
163.64
409.09
818.18
2.75
0.79
1.58
3.96
7.92
15.83
39.58
79.15
158.31
395.77
791.53
2.80
0.77
1.53
3.83
7.67
15.33
38.33
76.66
153.31
383.28
766.56
2.85
0.74
1.49
3.72
7.43
14.86
37.16
74.31
148.62
371.56
743.12
2.90
0.72
1.44
3.61
7.21
14.42
36.05
72.11
144.21
360.53
721.07
2.95
0.70
1.40
3.50
7.00
14.01
35.01
70.03
140.06
350.14
700.29
3.00
0.68
1.36
3.40
6.81
13.61
34.03
68.07
136.13
340.34
680.67
3.05
0.66
1.32
3.31
6.62
13.24
33.11
66.21
132.43
331.06
662.13
3.10
0.64
1.29
3.22
6.45
12.89
32.23
64.46
128.91
322.28
644.56
R2(kohm)=(1.215*R1(kohm))/(Vout-1.215)
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External Resistor Divider Table
Analog Microelectronics, Inc.
10
300mA CMOS LDO
AME8804
R1(kohm)
1.00
2.00
5.00
10.00
20.00
50.00
100.00
200.00
500.00 1000.00
Vout
3.15
0.63
1.26
3.14
6.28
12.56
31.40
62.79
125.58
313.95
627.91
3.20
0.61
1.22
3.06
6.12
12.24
30.60
61.21
122.42
306.05
612.09
3.25
0.60
1.19
2.99
5.97
11.94
29.85
59.71
119.41
298.53
597.05
3.30
0.58
1.17
2.91
5.83
11.65
29.14
58.27
116.55
291.37
582.73
3.35
0.57
1.14
2.85
5.69
11.38
28.45
56.91
113.82
284.54
569.09
3.40
0.56
1.11
2.78
5.56
11.12
27.80
55.61
111.21
278.03
556.06
3.45
0.54
1.09
2.72
5.44
10.87
27.18
54.36
108.72
271.81
543.62
3.50
0.53
1.06
2.66
5.32
10.63
26.59
53.17
106.35
265.86
531.73
3.55
0.52
1.04
2.60
5.20
10.41
26.02
52.03
104.07
260.17
520.34
3.60
0.51
1.02
2.55
5.09
10.19
25.47
50.94
101.89
254.72
509.43
3.65
0.50
1.00
2.49
4.99
9.98
24.95
49.90
99.79
249.49
498.97
3.70
0.49
0.98
2.44
4.89
9.78
24.45
48.89
97.79
244.47
488.93
3.75
0.48
0.96
2.40
4.79
9.59
23.96
47.93
95.86
239.64
479.29
3.80
0.47
0.94
2.35
4.70
9.40
23.50
47.00
94.00
235.01
470.02
3.85
0.46
0.92
2.31
4.61
9.22
23.06
46.11
92.22
230.55
461.10
3.90
0.45
0.91
2.26
4.53
9.05
22.63
45.25
90.50
226.26
452.51
3.95
0.44
0.89
2.22
4.44
8.88
22.21
44.42
88.85
222.12
444.24
4.00
0.44
0.87
2.18
4.36
8.73
21.81
43.63
87.25
218.13
436.27
4.05
0.43
0.86
2.14
4.29
8.57
21.43
42.86
85.71
214.29
428.57
4.10
0.42
0.84
2.11
4.21
8.42
21.06
42.11
84.23
210.57
421.14
4.15
0.41
0.83
2.07
4.14
8.28
20.70
41.40
82.79
206.98
413.97
4.20
0.41
0.81
2.04
4.07
8.14
20.35
40.70
81.41
203.52
407.04
4.25
0.40
0.80
2.00
4.00
8.01
20.02
40.03
80.07
200.16
400.33
4.30
0.39
0.79
1.97
3.94
7.88
19.69
39.38
78.77
196.92
393.84
4.35
0.39
0.78
1.94
3.88
7.75
19.38
38.76
77.51
193.78
387.56
4.40
0.38
0.76
1.91
3.81
7.63
19.07
38.15
76.30
190.74
381.48
4.45
0.38
0.75
1.88
3.76
7.51
18.78
37.56
75.12
187.79
375.58
4.50
0.37
0.74
1.85
3.70
7.40
18.49
36.99
73.97
184.93
369.86
4.55
0.36
0.73
1.82
3.64
7.29
18.22
36.43
72.86
182.16
364.32
4.60
0.36
0.72
1.79
3.59
7.18
17.95
35.89
71.79
179.47
358.94
4.65
0.35
0.71
1.77
3.54
7.07
17.69
35.37
70.74
176.86
353.71
4.70
0.35
0.70
1.74
3.49
6.97
17.43
34.86
69.73
174.32
348.64
4.75
0.34
0.69
1.72
3.44
6.87
17.19
34.37
68.74
171.85
343.71
4.80
0.34
0.68
1.69
3.39
6.78
16.95
33.89
67.78
169.46
338.91
4.85
0.33
0.67
1.67
3.34
6.69
16.71
33.43
66.85
167.13
334.25
4.90
0.33
0.66
1.65
3.30
6.59
16.49
32.97
65.94
164.86
329.72
4.95
0.33
0.65
1.63
3.25
6.51
16.27
32.53
65.06
162.65
325.30
5.00
0.32
0.64
1.61
3.21
6.42
16.05
32.10
64.20
160.50
321.00
R2(kohm)=(1.215*R1(kohm))/(Vout-1.215)
n
n
n
n
n
External Resistor Divider Table (contd.)
Note: Small load (greater than 2 mA) is necessary as R1 or R2 is larger than 50 Kohm. Otherwise, output
voltage probably cannot be pulled down to 0 V on disable mode.
Analog Microelectronics, Inc.
11
AME8804
300mA CMOS LDO
n
n
n
n
n
Package Dimension
SOT-26
MIN
MAX
MIN
MAX
A
1.00
1.45
0.0394
0.0571
A
1
0.00
0.15
0.0000
0.0591
A2
0.70
1.25
0.0276
0.0492
b
0.35
0.55
0.0138
0.0217
C
0.08
0.25
0.0031
0.0098
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
e
H
2.60
3.00
0.1024
0.1181
L
0.30
-
0.0118
-
1
1
1
1
0
°
10
°
0
°
10
°
S
1
0.85
1.05
0.0335
0.0413
1.90 BSC
0.07480 BSC
SYMBOLS
MILLIMETERS
INCHES
SOT-25
M IN
M AX
M IN
M AX
A
1.00
1.40
0.0394
0.0551
A
1
0.00
0.15
0.0000
0.0591
A2
0.70
1.25
0.0276
0.0492
b
0.35
0.50
0.0138
0.0197
C
0.08
0.25
0.0031
0.0098
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
e
H
2.60
3.00
0.1024
0.1181
L
0.35
-
0.0138
-
1
0
°
9
°
0
°
9
°
S
1
0.85
1.05
0.0335
0.0413
1.90 BSC
0.0748 BSC
SYM BOLS
M ILLIM ETERS
INCHES
Life Support Policy:
These products of Analog Microelectronics, Inc. are not authorized for use as critical components in life-
support devices or systems, without the express written approval of the president
of Analog Microelectronics, Inc.
Analog Microelectronics, Inc. reserves the right to make changes in the circuitry and specifications of its
devices and advises its customers to obtain the latest version of relevant information.
©
Analog Microelectronics, Inc., August 2001
Document: 2006-DS8804-E
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AME, Inc.
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Tel : (408) 988-2388
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