AME8841REHA [AME]
600mA CMOS LDO; 600毫安CMOS LDO
| 型号： | AME8841REHA |
| 厂家： | 
ANALOG MICROELECTRONICS |
| 描述： | 600mA CMOS LDO |
| 文件： | 总10页 (文件大小：82K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n General Description
n Features
The AME8841 linear regulator features low quiescent cur-
rent (30µA typ.) with low dropout voltage, making it ideal
for battery applications. The space-saving SO-8 pack-
age is attractive for "Pocket” and "Hand Held" applica-
tions.
l Very Low Dropout Voltage
l Guaranteed 600mA Output
l Accurate to within 1.5%
l 30µA Quiescent Current
l Over-Temperature Shutdown
l Current Limiting
These rugged devices have both Thermal Shutdown,
and Current Fold-back to prevent device failure under
the "Worst" of operating conditions.
l Short Circuit Current Fold-back
l Power-Saving Shutdown Mode
l Space-Saving SO-8 Package
l Many fixed output voltages available
l Low Temperature Coefficient
The AME8841 is stable with an output capacitance of
2.2µF or greater.
n Pin Configuration
n Applications
l Instrumentation
SO-8 Top View
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
OUT
IN
NC
EN
NC
NC
AME
8841
GND
OUT
l Battery Powered Widgets
l Electronic Scales
n Functional Block Diagram
IN
OUT
n Typical Application
Overcurrent
Shutdown
AME8841 OUT
IN
OUT
IN
EN
Thermal
GND
Shutdown
C1
C3
2.2
EN
1µF
5V
µF
R1
R2
AMP
V
ref=1.215V
GND
1
Analog Microelectronics, Inc.
600mA CMOS LDO
AME8841
n Absolute Maximum Ratings:
Parameter
Maximum
Unit
Input Voltage
8
V
A
V
Output Current
PD / (VIN - VO)
GND - 0.3 to VIN + 0.3
B
Input, Output Voltage
ESD Classification
n Recomended Operating Conditions:
Parameter
Rating
Unit
oC
Ambient Temperature Range
Junction Temperature
-40 to +85
oC
-40 to +125
n Thermal Paramters
Parameter
Maximum
Unit
oC / W
Thermal Resistance (
)
θja
123.7
Internal Power Dissipation (PD)
810
150
300
mW
oC
( T = 100oC)
∆
Maximum Junction Temperature
oC
Maximum Lead Temperature ( 10 Sec)
Caution: Stress above the listed absolute rating may cause permanent damage to the device
2
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Ordering Information
Part Number
Marking
Output
Package
Operating Temp.
8841
AEHA
yyww
8841
BEHA
yyww
8841
CEHA
yyww
8841
DEHA
yyww
8841
EEHA
yyww
8841
FEHA
yyww
8841
GEHA
yyww
8841
HEHA
yyww
8841
IEHA
yyww
8841
JEHA
yyww
8841
KEHA
yyww
8841
LEHA
yyww
8841
MEHA
yyww
8841
NEHA
yyww
8841
OEHA
yyww
8841
REHA
yyww
-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
-40OC to +85OC
-40OC to +85OC
-40OC to +85OC
-40OC to +85OC
AME8841AEHA
3.3V
SO-8
AME8841BEHA
AME8841CEHA
AME8841DEHA
AME8841EEHA
AME8841FEHA
AME8841GEHA
AME8841HEHA
AME8841IEHA
AME8841JEHA
AME8841KEHA
AME8841LEHA
AME8841MEHA
AME8841NEHA
AME8841OEHA
AME8841REHA
3.0V
2.8V
2.5V
3.8V
3.6V
3.5V
2.7V
3.4V
2.85V
3.7V
1.5V
1.8V
2.9V
3.1V
2.65V
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
Please consult AME sales office or authorized Rep./Distributor for other output voltage
and package type availability.
3
Analog Microelectronics, Inc.
600mA CMOS LDO
AME8841
n Electrical Specifications
TA = 25o C unless otherwise noted
Parameter
Input Voltage
Symbol
VIN
Test Condition
Min
Typ Max Units
Note 1
-1.5
7
V
Output Voltage Accuracy
VO
IO=1mA
1.5
%
1.4V<VO(NOM)<=2.0V
1400
800
600
IO=600mA
See
chart
Dropout Voltage
VDROPOUT
2.0V<VO(NOM)<=2.8V
2.8V<VO(NOM)
mV
VO=VONOM -2.0%
Output Current
IO
ILIM
ISC
IQ
VO>1.2V
600
600
mA
mA
mA
Current Limit
VO>1.2V
VO<0.8V
800
300
30
Short Circuit Current
Quiescent Current
Ground Pin Current
600
50
IO=0mA
A
µ
IGND
IO=1mA to 600mA
30
50
A
µ
VO < 2.0V
-0.15
0.15
0.1
0.4
%
%
IO=5mA
Line Regulation
REGLINE
4.0V > VO >= 2.0V
VO >= 4.0V
-0.1 0.02
VIN=VO+1 to VO+2
-0.4
150
30
%
oC
Over Temerature Shutdown
Over Temerature Hysterisis
VO Temperature Coefficient
OTS
OTH
TC
oC
ppm/oC
30
f=1kHz
f=10kHz
f=100kHz
50
IO=100mA
Power Supply Rejection
PSRR
20
dB
C =2.2 F
µ
O
15
f=10Hz to 100kHz
Output Voltage Noise
EN Input Threshold
EN Input Bias Current
eN
Co=2.2 F
30
mVrms
µ
IO=10mA,CBYP=0 F
µ
VEH
VEL
IEH
VIN=2.7V to 7V
2.0
0
Vin
0.4
0.1
0.5
1
V
V
VIN=2.7V to 7V
VEN=VIN, VIN=2.7V to 7V
A
µ
IEL
VEN=0V, VIN=2.7V to 7V
VIN=5V, VO=0V, VEN<VEL
A
µ
Shutdown Supply Current
ISD
0.5
A
µ
Note1:VIN(min)=VOUT+VDROPOUT
4
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Detailed Description
n Enable
The AME8841 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
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.
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
o
150 C, or the current exceeds 600mA. During thermal
shutdown, the output voltage remains low. Normal op-
eration is restored when the junction temperature drops
o
below 110 C.
The AME8841 switches from voltage mode to current mode
when the load exceeds the rated output current. This
prevents over-stress. The AME8841 also incorporates
current foldback to reduce power dissipation when the
output is short circuited. This feature becomes active
when the output drops below 0.8 volts, and reduces the
current flow by 65%. Full current is restored when the
voltage exceeds 0.8 volts.
n External Capacitors
The AME8841 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 expen-
sive. 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.
600mA CMOS LDO
AME8841
Load Step ( 1mA-600mA)
Ground Current vs. Input Voltage
45
40
35
30
25
20
15
10
5
85O
C
25O
C
0
0
0
1
2
3
4
5
6
7
8
TIME ( 20mS/DIV)
Input Voltage (V)
Drop Out Voltage vs. Output Voltage
Power Supply Rejection Ratio
0
-10
-20
-30
-40
-50
-60
-70
-80
0.3
0.25
0.2
100mA
C L=2.2
µ
F Tantalum
BYP=0
IL O A D=600mA
C
0.15
0.1
10mA
100mA
0.05
0
1mA
µ
100 A
µ
100 A
1.0E+01
1.0E+03
1.0E+05
1.0E+07
2
2.5
3
3.5
4
4.5
5
5.5
Output Voltage (V)
Frequency (Hz)
Safe Operating Area
600
100
8807AEHA
8841AEHA
10
1.0
8.0
0.1
Input-Output Voltage Differential (V)
6
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
Noise Measurement
Overtemperature Shutdown
CL = 2.2µF
NO FILTER
0
RLOAD =6.6
Ω
0
TIME (0.5Sec/DIV)
Short Circuit Response
TIME (20mS/DIV)
Current Limit Response
CLOAD=2.2
CIN=1
RLOAD<100m
µF
F
Ω
µ
CL O A D =2.2
IN=1.0
L O A D =3.3
VO U T N O M =3.3V
µF
C
µF
R
Ω
TIME (2mS/DIV)
TIME (2mS/DIV)
Line Transient Response
Chip Enable Transient Response
CL=2
µF
RL=10
Ω
CL O A D =2.2µF
0
0
I
V
V
L O A D =1mA
O U T D C =3.3V
INDC=4.5V
TIME (200mS/DIV)
TIME ( 1mS/DIV)
7
Analog Microelectronics, Inc.
600mA CMOS LDO
AME8841
EN pin vs. Temp.
Quiescent Current vs.Temp.
-0.20
40
38
36
34
32
30
28
26
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
-20
0
20
40
60
80
-20
0
20
40
60
80
Temperature (0C)
Temperature (0C)
Shut Down Current vs.
Temp.
Dropout Voltage vs. Temp.
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
500
480
460
440
420
400
380
360
-20
0
20
40
60
80
-20
0
20
40
60
80
Temperature (0C)
Temperature (0C)
Vout vs. Temp.
Load Regulation vs. Temp.
2.660
2.655
2.650
2.645
2.640
2.635
2.630
2.625
2.620
0.55
0.50
0.45
0.40
0.35
0.30
-20
0
20
40
60
80
-20
0
20
40
60
80
Temperature (0C)
Temperature (0C)
8
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Package Dimension
SO-8
MILLIMETERS
INCHES
MIN
SYMBOLS
A
MIN
1.35
0.10
—
MAX
1.75
0.25
—
MAX
0.069
0.010
—
0.053
0.004
—
A
1
A2
B
C
D
E
e
0.33
0.19
4.80
3.80
—
0.51
0.25
5.00
4.00
—
0.013
0.007
0.189
0.150
—
0.020
0.010
0.1970
0.157
—
θ
H
L
y
5.80
0.40
—
0°
6.20
1.27
0.10
8°
0.228
0.016
0.244
0.050
0.004
8°
0°
θ
9
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-DS8841-C
Corporate Headquarters
Asia Pacific Headquarters
AME, Inc.
2F, NO. 187 Kang-Chien Road, Nei-Hu Dist.,
Taipei 114, Taiwan, R.O.C.
Tel : 886 2 2627-8687
Analog Microelectronics, Inc.
3100 De La Cruz Blvd. Suite 201
Santa Clara, CA. 95054-2046
Tel : (408) 988-2388
Fax: (408) 988-2489
Fax: 886 2 2659-2989
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