The AME8801/8812/8840 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-25 package is 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.
In applications requiring a low noise, regulated supply,
place a 1000 pF capacitor between Bypass and Ground.
The AME8801 is stable with an output capacitance of
2.2µF or greater.
n Features
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 Noise Reduction Bypass Capacitor
l Power-Saving Shutdown Mode
l Space-Saving SOT-25, SOT-26 Packages
l Factory Pre-set Output Voltages
l Low Temperature Coefficient
l All AME' s Lead Free Product Meet RoHS
Standards
n Functional Block Diagram
IN
Overcurrent
Shutdown
Thermal
Shutdown
EN
BYP
V
ref
AMP
=1.215V
R1
R2
n Typical Application
INPUT
C1
1µF
IN
C2
1000pF
AME8801
AME8812
AME8840
GND
OUT
ENBYP
OUT
GND
OUTPUT
C3
2.2µF
n Applications
l Instrumentation
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
l Battery Powered Widgets
l Electronic Scales
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Page 2
AME, Inc.
n Pin Configuration
300mA CMOS LDOAME8801 / 8812 / 8840
SOT-25
Top View
54
AME8801
132
SOT-25
Top View
54
AME8812
132
AME8801
1. V
IN
2. GND
3. EN
4. BYP
5. OUT
* Die Attach:
Conductive Epoxy
AME8812
1. EN
2. GND
3. V
IN
4. OUT
5. BYP
SOT-26
Top View
645
AME8801
132
SOT-25
Top View
54
AME8840
132
AME8801
1. OUT_1
2. GND
3. BYP
4. EN
5. V
IN
6. OUT_2
* Die Attach:
Non-Conductive Epoxy
AME8840
1. EN
2. GND
3. BYP
4. OUT
5. V
IN
* Die Attach:
Conductive Epoxy
2
* Die Attach:
Conductive Epoxy
Page 3
AME, Inc.
A:
3.3V1:1.3V
E:
-40OC to 85
O
C
E:
SOT-2X
V:5L:
Low Profile
B:
3.0V2:2.0VY:6Y:Lead Free & Low Profile
C:
2.8V3:4.2VZ:Lead Free
D:
2.5V4:4.0VE:3.8VF:3.6V
G:
3.5V
H:
2.7VI:3.4VJ:2.85V
K:
3.7VL:1.5V
M:
1.8VN:2.9VO:3.1VP:4.1VQ:4.75V
R:
2.65V
S:
5.0VT:1.2VU:3.2VV:3.15V
W:
2.3VY:1.9VZ:1.7V
AME8801 / 8812 / 8840300mA CMOS LDO
n Ordering Information
AME8801 x x xx x
AME8812 x x xx x
AME8840 x x xx x
Note: ww represents the date code and pls refer to the Date Code Rule befor the page of Package Dimension.
* A line on top of the first character represents lead free plating such as ALPww.
Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability.
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
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AME, Inc.
AME8801 / 8812 / 8840300mA CMOS LDO
n Absolute Maximum Ratings
ParameterMaximumUnit
Input Voltage8V
Output CurrentPD / (VIN - VO)mA
Output VoltageGND - 0.3 to V
ESD ClassificationB*
+ 0.3V
IN
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device.
* HBM B:2000V~3999V
n Recommended Operating Conditions
ParameterSymbolRatingUnit
Ambient Temperature RangeT
Junction Temperature RangeT
A
J
- 40 to + 85
- 40 to + 125
n Thermal Information
ParameterPackageDie AttachSymbolMaximumUnit
Thermal Resistance
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
*SOT-25Conductive Epoxy81
θ
JC
140
*SOT-26
Non-Conductive
Epoxy
SOT-25Conductive Epoxy260
θ
JA
280
SOT-26
Non-Conductive
Epoxy
o
C
o
C
o
C / W
Internal Power Dissipation
Maximum Junction Temperature
Solder Iron(10Sec)**
* Measure θ
on center of molding compound if IC has no tab.
JC
** MIL-STD-202G 210F
SOT-25Conductive Epoxy400
P
D
400
SOT-26
Non-Conductive
Epoxy
150
350
mW
o
C
o
C
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AME, Inc.
n Electrical Specifications
TA = 25OC unless otherwise noted
ParameterSymbolMinTypMaxUnits
Input Voltage V
Output Voltage Accuracy V
IN
O
Test Condition
IO=1mA
IO=300mA
300mA CMOS LDOAME8801 / 8812 / 8840
Note 17V
-1.51.5
%
-2.52.5
Dropout VoltageV
DROPOUT
Output Current I
Current LimitI
Short Circuit Current, Note2 I
Quiescent CurrentI
Ground Pin Current I
O
LIM
SC
Q
GND
IO=300mA
VO=V
-2.0%
O(NOM)
IO=1mA to 300mA
1.2V<=V
2.0V<V
2.8V<V
VO>1.2V
VO>1.2V
VO<0.8V
IO=0mA
<=2.0V1300
O(NOM)
<=2.8V400
O(NOM)
O(NOM)
300mA
300450mA
150300mA
3050µA
35µA
1.2V <= VO <= 1.4V-0.20.2
Line Regulation REG
Load Regulation REG
LINE
IO=1mA
VIN=VO+1 to VO+2
LOAD
IO=1mA to 300mA
1.4V < VO <= 2.0V-0.150.15
2.0V < VO < 4.0V-0.10.020.1
4.0V <= Vo
-0.40.20.4
-10.21%
Over Temerature Shutdown OTS150
Over Temerature Hysterisis OTH30
VO Temperature CoefficientTC30
f=100Hz60
IO=100mA
Power Supply Rejection
PSRR
CO=2.2µF
f=1kHz50
f=10kHz20
300
mV
%
o
C
o
C
ppm/oC
dB
Output Voltage Noise eN
EN Input Threshold
EN Input Bias Current
Shutdown Supply CurrentI
Shutdown Output VoltageV
Note1: V
IN(MIN)=VOUT+VDROPOUT
V
V
I
EH
I
EL
SD
O,SD
EH
EL
IO=10mA
VIN=2.7V to 7V
VIN=2.7V to 7V
VEN=VIN, VIN=2.7V to 7V
VEN=0V, VIN=2.7V to 7V
VIN=5V, VO=0V, VEN<V
IO=0.4mA, VEN<V
Co=2.2µF30
2.0VinV
00.4V
EL
EL
0.51µA
00.4V
µVrms
0.1µA
0.5µA
Note2: To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be
applied before a current source load is applied.
12
f=10Hz to 100kHz
Page 13
AME, Inc.
AME8801 / 8812 / 8840300mA CMOS LDO
n Detailed Description
The AME8801/8812/8840 family of CMOS regulators
contain a PMOS pass transistor, voltage reference, error
amplifier, over-current protection, and thermal shutdown.
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 AME8801/8812/8840 switches from voltage mode
to current mode when the load exceeds the rated output
current. This prevents over-stress. The AME8801/8812/
8840 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.
A third capacitor can be connected between the BYPASS pin and GND. This capacitor can be a low cost
Polyester Film variety between the value of 0.001 ~
0.01µF. A larger capacitor improves the AC ripple rejection, but also makes the output come up slowly. This
"Soft" turn-on is desirable in some applications to limit
turn-on surges.
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.
n 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 1µA. This pin behaves
much like an electronic switch.
n External Capacitors
The AME8801/8812/8840 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 0.1 µ F
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.