Analog Microelectronics, Inc.
AME8804
nn
n General Description
nn
The AME8804 family of positive, linear regulators feature low quiescent current (30µA typ.) with low dropout
voltage, making them ideal for battery applications. The
space-saving SOT-26 and SOT-25 packages are attractive 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" detector, which pulls low when the output is out of regulation.
The AME8804 is stable with an output capacitance of
2.2µF or greater.
300mA CMOS LDO
nn
n Features
nn
l Very Low Dropout Voltage
l Guaranteed 300mA Output
l Accurate to within 1.5%
l 30µA Quiescent Current
l Over-Temperature Shutdown
l Current Limiting
l Short Circuit Current Fold-back
l Power Good Detector (6 pin version only)
l Power-Saving Shutdown Mode
l Space-Saving SOT-26 and SOT-25
l Adjustable Output Voltages
l Low Temperature Coefficient
nn
n Applications
nn
nn
n Functional Block Diagram
nn
IN
Overcurrent
Shutdown
Thermal
Shutdown
EN
x110%
V
PG
ref
V
x90%
ref
AMP
V
=1.215V
ref
OUT
ADJ
GND
l Instrumentation
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
l Battery Powered Widgets
l Electronic Scales
nn
n T ypical Application
nn
GND
OUT
ADJ
R1
R2
C2
100p
IN
C1
5V
V
= 1.215 (R1 +R2)/R2
OUT
C2 is unnecessary when R1 or R2 < 20K
PG pin is only available in the SOT-26 package option
1
EN
IN
AME8804
PG
µ
F
OUT
C3
2.2
µ
F
1
Analog Microelectronics, Inc.
AME8804
nn
n Pin Configuration
nn
SOT-26 Top View
6
1
nn
n Ordering Information
nn
45
1. V
2. GND 5. ADJ
2
3
3. EN 6. V
300mA CMOS LDO
SOT-25 T op View
5
IN
4. PG
OUT
12
4
1. V
IN
2. GN D 5. V
3
3. EN
4. ADJ
OUT
Part Number Marking Out put Volt age Package Operat i ng Temp. Range
AME8804AEEY AAUww Adjusta ble SOT-26
AME8804AEEV AJCww Adjustable SOT-25
Please cons ul t A M E sal es office or authorized Rep./Distribut or for other pack age t ype availabil i t y.
O
-40
C to +85OC
O
-40
C to +85OC
2
Analog Microelectronics, Inc.
AME8804
nn
n Absolute Maximum Ratings
nn
Parameter Maximum Unit
Input Volt age 8 V
Output Current
Input, Out put V olt age GND - 0.3 to V
ESD Classification B
nn
n Recommended Operating Conditions
nn
Parameter Rating Unit
Am bi ent Temperature Range - 40 to +85
PD / (VIN - VO)
+ 0.3 V
IN
300mA CMOS LDO
mA
o
C
Juncti on Temperature - 40 to +125
nn
n Thermal Information
nn
Parameter
Thermal Resistance (
Internal Power Dis sipat ion (P
(∆T = 100
Thermal Resistance (
Internal Power Dis sipat ion (P
(∆T = 100
Maximum Junction Temperat ure
Max i m um Lead Temperat ure ( 10 Sec )
Caution: Stress above the listed absolute rating may cause permanent damage to the device
o
C)
o
C)
) SOT-25 260
θ
ja
)
D
SOT-25 380 mW
) SOT-26 260
θ
ja
)
D
SOT-26 380 mW
Max imum Unit
150
300
o
C
o
C / W
o
C / W
o
o
C
C
3
Analog Microelectronics, Inc.
AME8804
nn
n Electrical Specifications
nn
300mA CMOS LDO
T A = 250C VIN=5V unless otherwise noted
Parameter Symbol Min Typ Max Units
Input Vol t age V
Output Voltage A ccu rac y V
Dropout V olt age V
Output Current I
Current Lim it I
Short Circ uit Current I
Qui esc en t Curre nt I
Ground Pi n Current I
Line Regulat ion REG
Load Regulati on REG
IN
O
DROPOUT
O
LIM
SC
Q
GND
LINE
LOAD
I
O
VO=V
VIN=VO+1 to VO+2
Over Temerature Shut down OTS 150
Over Temerat ure Hyst erisis OTH 30
Temperature Coefficient TC 30
V
O
I
Power S upply Rejec t ion
PSRR f=10kHz 20 dB
Output Voltage Noise eN
O
CO=2.2µF
f=10Hz t o 1 00k Hz
I
=10mA,C
O
Test Condition
=1mA
I
O
=300m A
-2.0%
ONOM
V
>1.2V
O
VO>1.2V
V
<0.8V
O
I
=0mA
O
I
=1mA to 300mA
O
IO=5mA
=1mA to 300mA
I
O
=100m A
=0µF
BYP
Note 1 7 V
-1.5 1.5 %
1.5V<V
2.0V < V
2.8V < V
<=2.0V 1300
O(NOM)
<=2.8V 400
O(NOM)
<3. 8V 300
O(NOM)
300 mA
300 450 mA
V
< 2. 0V 0.15 %
O
V
>= 2. 0V 0.02 0. 1 %
O
f=1kHz 50
f=100kHz 15
Co=2.2µF30
See
chart
150 300 mA
30 50
35
0.2 1 %
ppm/
µ
mV
A
µ
A
µ
o
C
o
C
Vrms
o
C
ADJ Inpu t Bias Current I
ADJ Reference V olt age V
EN Input Threshold
EN Input B i as Current
Shut down S uppl y Current I
Shut down O ut put V olt age V
Output Under V ol t age V
Output O ver Voltage V
PG Lea k age Current I
PG Voltage Rat i ng V
PG Voltage Low V
Note1: V
IN(min)=VOUT+VDROPOUT
4
ADJ
REF
V
V
I
EH
I
EL
SD
O,SD
LC
EH
UV
OV
PG
EL
OL
V
=2.7V to 7V
IN
V
=2.7V to 7V
IN
V
V
V
, VIN=2.7V to 7V
EN=VIN
=0V, VIN=2.7V to 7V
EN
=5V, VO=0V, VEN<V
IN
I
=35µA,VEN<V
O
V
=7V
PG
V
in regulation
O
I
=0.4mA
SINK
1
A
µ
1.203 1.215 1.227 V
2.0 Vin V
00.4V
0.1
0.5
EL
EL
0.5 1
00.1V
85 %V
115 %V
1
A
µ
A
µ
A
µ
O(NOM)
O(NOM)
A
µ
7V
0.4 V
Analog Microelectronics, Inc.
AME8804
nn
n Detailed Description
nn
The AME8804 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error amplifier, 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 protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds
150oC, or the current exceeds 300mA. During thermal
shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops
below 120oC.
The AME8804 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress. The AME8804 also incorporates current foldback to reduce power dissipation
when the output is short circuited. This feature becomes
active when the output drops below 0.8volts, and reduces the current flow by 65%. Full current is restored
when the voltage exceeds 0.8 volts.
300mA CMOS LDO
nn
n Enable
nn
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 1µA. This pin behaves
much like an electronic switch.
nn
n Power Good
nn
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 voltage, it pulls low. This can occur under the following conditions:
1) Input Voltage too low.
2) During Over-Temperature.
3) During Over-Current.
4) If output is pulled up.
nn
n External Capacitors
nn
The AME8804 is stable with an output capacitor to
ground of 2.2µF 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 comparatively expensive. One option is to parallel a 0.1µF
ceramic capacitor with a 10µF Aluminum Electrolytic.
The benefit is low ESR, high capacitance, and low overall cost.
A second capacitor is recommended between the input
and ground to stabilize Vin. The input capacitor should
be at least 0.1µF 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.
5
Analog Microelectronics, Inc.
AME8804
45
40
35
A)
µ
µµ
µ
30
25
20
15
10
Ground Current (
5
0
012345678
0
-10
-20
-30
-40
Ground Current vs. Input Voltage
85OC
25OC
Input Voltage (V)
Power Supply Rejection Ratio
CL=2.2µF Tantalum
C
=0
BYP
100mA
300mA CMOS LDO
Load Step ( 1mA-300mA)
Output
I
Load
(200mA/DIV) Vo(5mV/DIV)
L
I
TIME( 20mS/DIV)
Chip Enable Transient Response
CL=2.2µF
C
=2.2µF
IN
CL=2µF
R
=10
Ω
L
0
0
-50
PSRR (dB)
100mA
10mA
-60
-70
100µA
100µA
-80
1.0E+01 1.0E+03 1.0E+05 1.0E+07
Frequency (Hz)
Drop Out Voltage vs Output Voltage
300
250
200
150
100
Drop Out Voltage (mV)
50
0
2.5 2.75 3 3.25 3.5 3.75 4
Output Voltage (V)
I
LOAD
I
LOAD
I
LOAD
=300mA
=200mA
=100mA
1mA
Output (1V/DIV) Enable (2V/DIV)
TIME ( 1mS/DIV)
Drop Out Voltage vs Load Current
250
Top to bottom
V
=2.5V
200
150
100
50
Dropout Voltage (mV)
0
OUT
=2.8V
V
OUT
V
=3.0V
OUT
V
=3.3V
OUT
V
=3.5V
OUT
V
=3.8V
OUT
0 50 100 150 200 250 300
Load Current (mA)
0
6
Analog Microelectronics, Inc.
AME8804
Vo (1mV/ DIV)
Noise Measurement
TIME (20mS/DIV)
Short Circuit Response
R
=100
LOAD
R
=0.1
SHORT
300mA CMOS LDO
Safe Operating Area
300
100
SOT-25
Output Current (mA)
10
0.1
1.0
Input-Output Voltage Differential (V)
Overtemperature Shutdown
Ω
Ω
SOT-26
8.0
(400mA/DIV)
LOAD
(1V/DIV) I
OUT
V
Current Limit Response
(200mA/DIV)
OUT
(1V/DIV) I
OUT
V
TIME (2mS/DIV)
R
TIME (2mS/DIV)
LOAD
=3.3
(200mA/DIV)
OUT
0
(1V/DIV) I
OUT
V
R
LOAD
=6.6
Ω
0
0
0
TIME (0.5Sec/DIV)
Line Transient Response
Ω
(1V/DIV)
IN
0
(10mV/DIV) V
OUT
0
V
TIME (200mS/DIV)
C
LOAD
I
LOAD
V
OUTDC
V
INDC
=2.2µF
=1mA
=3.3V
=4.5V
7
Analog Microelectronics, Inc.
AME8804
10000
1000
100
)
Ω
ΩΩ
Ω
10
ESR (
1
0.1
0.01
Stability vs. ESR vs I
Unstable Region
Stable Region
Untested Region
0 50 100 150 200
LOAD
CL=1µF
ILOAD (mA)
300mA CMOS LDO
Stability vs. ESR vs I
10000
Unstable Region
1000
100
)
Ω
ΩΩ
Ω
10
ESR (
1
0.1
0.01
0 50 100 150 200
Stable Region
Untested Region
ILOAD (mA)
LOAD
CL=2µF
Stability vs. ESR vs I
10000
Unstable Region
1000
100
)
Ω
ΩΩ
Ω
10
ESR (
1
0.1
0.01
0 50 100 150 200
Stable Region
Untested Region
ILOAD (mA)
LOAD
CL=3µF
Stability vs. ESR vs I
10000
1000
)
Ω
ΩΩ
Ω
ESR (
0.001
Unstable Region
100
10
1
0.1
0.01
0 50 100 150 200
Stable Region
Untested Region
ILOAD (mA)
LOAD
CL=10µF
8
Analog Microelectronics, Inc.
AME8804
nn
n External Resistor Divider Table
nn
R1(kohm) 1.00 2.00 5.00 10.00 20.00 50.00 100.00 200.00 500.00 1000.00
Vou t
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)
300mA CMOS LDO
9
Analog Microelectronics, Inc.
AME8804
nn
n External Resistor Divider Table (contd.)
nn
R1(kohm) 1.00 2.00 5.00 10.00 20.00 50.00 100.00 200.00 500.00 1000.00
Vou t
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)
300mA CMOS LDO
10
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.
AME8804
nn
n Package Dimension
nn
SOT-26
300mA CMOS LDO
SYMBOLS
A 1.00 1.40 0.0394 0.0551
A
1
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
θθθθ
S
1
MILLIMETERS INCHES
MIN MAX MIN MAX
0.00 0.15 0.0000 0.0591
1.90 BSC 0.0748 BSC
°
0
0.85 1.05 0.0335 0.0413
°
9
°
0
°
9
SOT-25
SYMBOLS
A 1.00 1.45 0.0394 0.0571
A
1
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 -
θ1
θ1
θ1θ1
S
1
MILLIMETERS INCHES
MIN MAX MIN MAX
0.00 0.15 0.0000 0.0591
1.90 BSC 0.07480 BSC
°
0
0.85 1.05 0.0335 0.0413
°
10
°
0
°
10
11
www.analogmicro.com
E-Mail: info@analogmicro.com
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
Corporate Headquarters Asia Pacific Headquarters
Analog Microelectronics, Inc. AME, Inc.
3100 De La Cruz Blvd. Suite 201 2F, 187 Kang-Chien Road, Nei-Hu District
Santa Clara, CA. 95054-2046 Taipei 114, Taiwan, R.O.C.
Tel : (408) 988-2388 Te l : 886 2 2627-8687
Fax: (408) 988-2489 Fax: 886 2 2659-2989
Loading...