AME AME8843 750ma cmos ldo Datasheet

AME
AME8843
n General Description
The AME8843 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-223 package is attractive for "Pocket"
and "Hand Held" applications.
750mA CMOS LDO
n Functional Block Diagram
IN
OUT
Overcurrent
Shutdown
R1
Thermal
Shutdown
These rugged devices have both Thermal Shutdown,
and Current Fold-back to prevent device failure under the
"Worst" operating conditions.
AMP
The AME8843 is stable with an output capacitance of
2.2µF or greater.
R2
Vref=1.215V
GND
n Features
l Very Low Dropout Voltage
l Guaranteed 750mA Output
l Accurate to within 1.5%
l 30µA Quiescent Current
n Typical Application
l Over-Temperature Shutdown
l Current Limiting
IN
OUT
l Short Circuit Current Fold-back
IN
l Space-Saving SOT-223 Package
GND
l Factory Pre-set Output Voltages
l Low Temperature Coefficient
l All AME's Lead Free Products Meet RoHS
Standards
AME8843 OUT
C1
C2
1µF
2.2µF
5V
n Applications
l Instrumentation
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
l Battery Powered Widgets
Rev. A.02
1
AME
AME8843
750mA CMOS LDO
n Pin Configuration
SOT-223
Top View
AME8843
1. IN
AME8843
1
2
3
2. GND(TAB)
3. OUT
* Die Attach:
Conductive Epoxy
n Pin Description
2
Pin Number
Pin Name
Pin Description
1
IN
2
GND
Ground connection pin.
3
OUT
LDO voltage regulator output pin.
It should be decoupled with a 2.2µF or greater value low ESR
ceramic capacitor.
Input voltage pin.
It should be decoupled with 1µF or greater capacitor.
Rev. A.02
AME
AME8843
750mA CMOS LDO
n Ordering Information
AME8843 x x x x xxx x
Special Feature
Output Voltage
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Pin
Configuration
Operating Ambient
Number
Temperature
Package Type
Output Voltage
of
Range
Pins
A: 1. IN
(SOT-223) 2. GND
3. OUT
E: -40OC to +85 OC
G: SOT-223
T: 3
180: V=1.8V
250: V=2.5V
Special Feature
Z: Lead Free
n Ordering Information
Part Number
Marking*
Output Voltage
Package
Operating Ambient
Temperature Range
AME8843AEGT180
AWZyww
1.8V
SOT-223
- 40oC to +85oC
AME8843AEGT180Z
AWZyww
1.8V
SOT-223
- 40oC to+85oC
AME8843AEGT250
AWFyww
2.5V
SOT-223
- 40oC to +85oC
AME8843AEGT250Z
AWFyww
2.5V
SOT-223
- 40oC to +85oC
Note: yww represents the date code
* A line on top of the first character represents lead free plating such as AWZww.
Please consult AME sales office or authorized Rep./Distributor for the availability of output voltage and package type.
Rev. A.02
3
AME
AME8843
750mA CMOS LDO
n Absolute Maximum Ratings
Parameter
Maximum
Unit
-0.3 to +8
V
Output Voltage
-0.3 to VIN + 0.3
V
Output Current
PD / (V IN - VOUT)
mA
Input Voltage
B*
ESD Classification
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device.
* HBM B:2000V~3999V
n Recommended Operating Conditions
Parameter
Symbol
Rating
Unit
Ambient Temperature Range
TA
- 40 to +85
o
Junction Temperature Range
TJ
- 40 to +125
o
Storage Temperature Range
TSTG
- 65 to +150
o
C
C
C
n Thermal Information
Parameter
Package
Die Attach
Thermal Resistance*
( Junction to Case)
Thermal Resistance
( Junction to Ambient)
Symbol
Maximum
θJC
25
Unit
o
SOT-223
Internal Power Dissipation
Conductive Epoxy
θJA
120
PD
900
C/W
mW
Maximum Junction Temperature
150
o
C
Solder Iron (10 Sec)**
350
o
C
* Measure θJC on backside center of tab.
** MIL-STD-202G 210F
4
Rev. A.02
AME
AME8843
750mA CMOS LDO
n Electrical Specifications
TA = 25OC unless otherwise noted
Parameter
Symbol
Input Voltage
VIN
Output Voltage Accuracy
VO
Test Condition
IO=1mA
Min
Typ
Max
Units
Note 1
7
V
-1.5
1.5
%
1.3V<=VO(NOM) <=1.4V
Dropout Voltage
VDROPOUT
IO=750mA
1.4V<VO(NOM) <=2.0V
VO=VO(NOM) -2.0%
2.0V<VO(NOM) <=2.8V
1900
See 1400
chart 1000
2.8V<VO(NOM)
Output Current
mV
750
IO
VO>1.2V
750
mA
Current Limit
ILIM
VO>1.2V
1500 2000
mA
Short Circuit Current
ISC
VO<0.8V
750
Quiescent Current
IQ
IO=0mA
30
Ground Pin Current
IGND
IO =1mA to 750mA
35
Line Regulation
Load Regulation
Over Temperature Shutdown
Over Temperature Hysterisis
VO Temperature Coefficient
Power Supply Rejection
Output Voltage Noise
REGLINE
REGLOAD
mA
50
µA
1.3V <= VO <= 1.4V
-0.2
0.2
IO=1mA
1.4V < VO <= 2.0V
-0.15
0.15
VIN =VO+1 to VO+2
2.0V < VO < 4.0V
-0.1
0.02
0.1
4.0V <= VO
-0.4
0.2
0.4
0.2
1
IO =1mA to 750mA
µA
%
%
150
o
OTH
30
o
TC
30
OTS
PSRR
eN
IO=100mA
CO=2.2µF
f=10Hz to 100kHz
IO=10mA,CBYP =0µF
f=100Hz
60
f=1kHz
50
f=10kHz
20
Co=2.2µF
30
C
C
ppm/oC
dB
µVrms
Note1: V IN(MIN)=VOUT+VDROPOUT
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.
Rev. A.02
5
AME
AME8843
750mA CMOS LDO
n Detailed Description
The AME8843 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 750mA. During thermal shutdown,
the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC.
The AME8843 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress. The AME8843 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 AME8843 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.
6
Rev. A.02
AME
AME8843
750mA CMOS LDO
Ground Current vs. Input Voltage
Load Step (1mA-600mA)
Vo(10mV/DIV)
45
40
85 OC
Ground Current (µ A)
35
30
Output
C L=2.2µF
CIN=2.2µF
25
O
25 C
IL(200mA/DIV)
20
15
10
5
I Load
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
0.3
ILOAD=600mA
0.2
0.15
0.1
100mA
CL=2.2µF Tantalum
C BYP=0
-20
PSRR (dB)
Drop Out Voltage (V)
-10
0.25
-30
-40
-50
10mA
100mA
-60
0.05
-70
100 µ A
100 µ A
1mA
-80
0
2
2.5
3
3.5
4
4.5
5
10
5.5
Output Voltage (V)
1K
100K
10M
Frequency (Hz)
Safe Operating Area
Line Transient Response
75O C
rise
SOT-223
370
With HS capable of twice θjc
1.2 2
3
Input-Output Voltage Differential (V)
Rev. A.02
VOUT(10mV/DIV)
Output Current (mA)
500
V IN(1V/DIV)
750
C LOAD =2.2µF
I LOAD =1mA
V OUTDC =3.3V
V INDC =4.5V
TIME (200mS/DIV)
7
AME
AME8843
750mA CMOS LDO
0
R LOAD=6.6 Ω
VOUT (1V/DIV)
C L=2.2µF
No Filter
Overtemperature Shutdown
I OUT (200mA/DIV)
Vo (1mV DIV)
Noise Measurement
0
TIME (20ms/DIV)
TIME (0.5Sec/DIV)
TIME (2mS/DIV)
8
IOUT (200mV/DIV)
C LOAD =2.2µF
C IN=1.0µF
RLOAD=3.3Ω
VOUTNOM =3.3V
Short Circuit Response
C LOAD=2.2µF
C IN=1µF
R LOAD <100mΩ
VOU T (1V/DIV)
IOUT (200mA/DIV)
VOUT (1V/DIV)
Current Limit Response
TIME (2mS/DIV)
Rev. A.02
AME
AME8843
750mA CMOS LDO
n Tape and Reel Dimension
SOT-223
P
W
AME
AME
PIN 1
Carrier Tape, Number of Components Per Reel and Reel Size
Rev. A.02
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOT-223
12.0±0.1 mm
4.0±0.1 mm
2500pcs
330±1 mm
9
AME
AME8843
750mA CMOS LDO
n Package Dimension
SOT-223
Top View
Side View
SYMBOLS
D
B1
θ
C
o
13 (4X)
H
PIN 1
E
e
Front View
o
13 (4X)
F
A1
10
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX
A1
0.01
0.10
0.0004
0.0039
B
0.60
0.84
0.0236
0.0330
B1
2.90
3.15
0.1140
0.1240
C
0.24
0.38
0.0094
0.0150
D
6.30
6.71
0.2480
0.2640
E
3.30
3.71
0.1299
0.1460
F
1.40
1.80
0.0551
0.0709
2.30 BSC
e
H
θ
6.70
0
o
0.0906 BSC
7.30
10
o
0.2638
0
o
0.2874
10
o
B
Rev. A.02
www.ame.com.tw
E-Mail: [email protected]
Life Support Policy:
These products of AME, Inc. are not authorized for use as critical components in life-support
devices or systems, without the express written approval of the president
of AME, Inc.
AME, 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.
 AME, Inc. , November 2008
Document: 2013-DS8843-A.02
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District
Taipei 114, Taiwan.
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989
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