AMETHERM AME8848AEGT180Z

AME
AME8848
n General Description
The AME8848 of positive, linear regulators feature low
quiescent current (30µA typ.) with low dropout voltage,
making them ideal for battery applications. The spacesaving SOT-223 packages are attractive for "Pocket"
and "Hand Held" applications.
1A CMOS LDO
n Functional Block Diagram
IN
OUT
Overcurrent
Shutdown
These rugged devices have both thermal shutdown, and
current fold-back to prevent device failure under the "Worst"
operating conditions.
R1
Thermal
Shutdown
The AME8848 is stable with an output capacitance of
2.2µF or greater.
AMP
Vref=1.215V
n Features
R2
GND
l Very Low Dropout Voltage
l Guaranteed 1A Output
l Accurate to within +1.5%
l 30µA Quiescent Current
l Over-Temperature Shutdown
n Typical Application
l Current Limiting
l Short Circuit Current Fold-back
l Space-Saving SOT-223 Packages
IN
IN
l Factory Pre-set Output Voltages
AME8848 OUT
OUT
GND
l Low Temperature Coefficient
l All AME's Lead Free Products Meet RoHS
Standards
5V
C1
C2
1µF
2.2µF
n Applications
l Instrumentation
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
l Battery Powered Widgets
Rev.A.04
1
AME
AME8848
1A CMOS LDO
n Pin Configuration
SOT-223
Top View
AME8848AEGT
1. IN
2. GND(TAB)
AME8848
3. OUT
1
2
3
* Die Attach:
Conductive Epoxy
n Ordering Information
AME8848 x x x x xxx x
Special Feature
Output Voltage
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Pin
Configuration
A: 1. IN
2. GND
3. OUT
(SOT-223)
2
Operating Ambient
Temperature
Range
E: -40OC to +85OC
Package
Type
G: SOT-223
Number
of
Pins
T: 3
Output
Voltage
180: V=1.8V
250: V=2.5V
330: V=3.3V
Special Feature
Z: Lead Free
Rev.A.04
AME
AME8848
1A CMOS LDO
n Ordering Information
Part Number
Marking*
Output Voltage
Package
Operating Ambient
Temperature Range
AME8848AEGT180Z
BLIyww
1.8V
SOT-223
- 40oC to +85oC
AME8848AEGT250Z
BLJyww
2.5V
SOT-223
- 40oC to +85oC
AME8848AEGT330Z
BLKyww
3.3V
SOT-223
- 40oC to +85oC
Note: ww & yww represents the date code pls refer to Date Code Rule on Package Dimension.
* A line on top of the first letter represents lead free plating such as BLIyww.
Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability.
Rev.A.04
3
AME
AME8848
1A CMOS LDO
n Absolute Maximum Ratings
Parameter
Maximum
Unit
8
V
1.2
A
GND - 0.3 to VIN + 0.3
V
Input Voltage
Output Current
Input, Output 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
Thermal Resistance*
(Junction to Case)
SOT-223
Thermal Resistance
(Junction to Ambient)
SOT-223
Internal Power Dissipation
SOT-223
Solder Iron(10 Sec)**
Die Attach
Conductive Epoxy
Symbol
Maximum
θ JC
25
o
θJA
120
o
PD
900
350
Unit
C/W
C/W
mW
o
C
* Measure θJC on backside center of tab.
** MIL-STD-202G 210F
4
Rev.A.04
AME
AME8848
1A CMOS LDO
n Electrical Specifications
TA = 25OC unless otherwise noted.
Parameter
Input Voltage
Output Voltage Accuracy
Test Condition
Symbol
VIN
VOUT
IOUT=1mA
Min
Max
Units
Note 1
7
V
-1.5
1.5
%
1700
See
1200
chart
1000
1.8V<=VOUT(NOM)<=2.0V
Dropout Voltage
VDROP
IOUT=1A
VOUT=VOUT(NOM) - 2.0%
Typ
2.0V<VOUT(NOM)<=2.8V
2.8V<VOUT(NOM)
mV
Output Current
IOUT
VOUT>=1.8V
1000
mA
Output Current Limit
ILIM
VOUT>=1.8V
1100
mA
Output Short Circuit Current
ISC
VOUT<0.8V
400
800
mA
Quiescent Current
IQ
IOUT=0mA
30
50
µA
Ground Pin Current
IGND
IOUT=1mA to 1000mA
35
Output Voltage Line
Regulation
Output Voltage Load
Regulation
REGLINE
REGLOAD
µA
IOUT=1mA
1.8V<=VOUT<=2.0V
-0.15
VIN =VOUT+1 to
2.0V<VOUT<4.0V
-0.1
0.02
0.1
VOUT+2
VOUT>=4.0V
-0.4
0.2
0.4
0.4
1.2
IOUT = 1mA to 1000mA
0.15
%
%
Thermal Shutdown
Temperature
TSHDN
150
o
C
Temperature Hysterisis
THYS
30
o
C
TC
30
Output Voltage Temperature
Coefficient
Power Supply Ripple
Rejection
Output Voltage Noise
PSRR
eN
IOUT=100mA
COUT=2.2µF
f =10Hz to 100KHz
IOUT=10mA
f =100Hz
60
f =1KHz
50
f =10KHz
20
COUT=2.2µF
30
ppm/oC
dB
µVrms
Note1: VIN(MIN) = VOUT + V DROP
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.04
5
AME
AME8848
1A CMOS LDO
n Detailed Description
n External Capacitors
The AME8848 of CMOS regulators contains a PMOS
pass transistor, voltage reference, error amplifier, overcurrent protection, and thermal shutdown.
The AME8848 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.
The P-channel MOSFET 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 1100mA. During thermal
shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops
below 120oC.
The AME8848 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress. The AME8848 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.
6
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.
Rev.A.04
AME
AME8848
1A CMOS LDO
Ground Current vs. Input Voltage
Load Step (1mA-1000mA)
45
85O C
35
30
25
O
25 C
20
15
10
5
0
0
1
2
3
4
5
COUT = 2.2µF
CIN = 2.2µF
IO UT (500mA/DIV) VOUT (10mV/DIV)
Ground Current (µA)
40
6
7
VOUT
I OUT
8
Time (20mS/DIV)
Input Voltage (V)
Dropout Voltage vs. Output Voltage
Power Supply Ripple Rejection Ratio
0
1600
Top to Bottom
IOUT = 1000mA
IOUT = 800mA
IOUT = 600mA
IOUT = 400mA
IOUT = 200mA
1200
1000
-10
100mA
800
600
-30
-40
-50
400
-60
200
-70
0
1.8
2.5
3.3
4
5
-80
10
Rev.A.04
100 µ A
1K
100 µ A
1mA
100K
10M
Noise Measurement
VOUT (1mV/DIV)
VOUT (1mV/DIV)
VIN (1V/DIV)
Line Transient Response
Time (2mS/DIV)
10mA
100mA
Frequency (Hz)
Output Voltage (V)
VIN = 5.0V
COUT = 2.2µF
COUT = 2.2µF Tantalum
-20
PSRR (dB)
Dropout Voltage (mV)
1400
COUT = 2.2µF
No Filter
Time (20ms/DIV)
7
AME
AME8848
1A CMOS LDO
COUT = 2.2µF
CIN = 1.0µF
VOUT(NOM) = 3.3V
Time (2mS/DIV)
8
Short Circuit Response
VOUT (1V/DIV) IOUT (500mV/DIV)
IOUT (500mA/DIV) VOUT (1V/DIV)
Current Limit Response
C OUT = 2.2µF
C IN = 1µF
R LOAD < 100mΩ
Time (2mS/DIV)
Rev.A.04
AME
AME8848
1A CMOS LDO
n Date Code Rule
Marking
Date Code
Year
A
A
A
W
W
xxx0
A
A
A
W
W
xxx1
A
A
A
W
W
xxx2
A
A
A
W
W
xxx3
A
A
A
W
W
xxx4
A
A
A
W
W
xxx5
A
A
A
W
W
xxx6
A
A
A
W
W
xxx7
A
A
A
W
W
xxx8
A
A
A
W
W
xxx9
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.04
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
AME8848
1A CMOS LDO
n Package Dimension
SOT-223
Top View
Side View
SYMBOLS
D
B1
θ
C
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
o
13 (4X)
H
PIN 1
E
e
Front View
10
2.30 BSC
e
0.0906 BSC
F
1.40
1.80
0.0551
0.0709
F
H
6.70
7.30
0.2638
0.2874
A1
θ
13 o(4X)
0
o
10
o
0
o
10o
B
Rev.A.04
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: 2095-DS8848-A.04
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