AME AME8861AEEV250Y

AME, Inc.
600mA CMOS LDO
AME8861
n General Description
The AME8861 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.
n Functional Block Diagram
IN
OUT
Overcurrent
Shutdown
Thermal
Shutdown
EN
BYP
R1
AMP
The AME8861 is stable with an output capacitance of
2.2µF or greater.
n Features
l
l
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Very Low Dropout Voltage
600mA Output
Accurate to within 1.5%
30µA Quiescent Current
Over-Temperature Shutdown
Current Limiting
Short Circuit Current Fold-back
Noise Reduction Bypass Capacitor
Power-Saving Shutdown Mode
l Space-Saving SOT-25 Package
l Factory Pre-set Output Voltages
l Low Temperature Coefficient
R2
Vref=1.215V
GND
n Typical Application
INPUT
OUT
IN
OUTPUT
AME8861
BYP
5V
GND
EN
C1
C2
C3
1µ
µF
1000pF
2.2µ
µF
n Applications
l
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Instrumentation
Portable Electronics
Wireless Devices
Cordless Phones
PC Peripherals
Battery Powered Widgets
Electronic Scales
1
AME, Inc.
600mA CMOS LDO
AME8861
n Pin Configuration
SOT-25
Top View
5
AME8861
1. IN
2. GND
3. EN
4. BYP
5. OUT
4
AME8861
1
2
3
n Ordering Information
AME8861 x x x x x x
Special Feature
Voltage
Number of Pins
Package Type
Operating Temperature Range
Pin Configuration
Pin
Configuration
A: 1.
2.
3.
4.
5.
2
IN
GND
EN
BYP
OUT
Operating
Temperature
Range
Package Type
Number
of
Pins
E: -40OC to 85OC
E: SOT-2X
V: 5
Voltage
Special Feature
300: V=3.0V
250: V=2.5V
330: V=3.3V
L: Low Profile
Y: Lead Free & Low Profile
Z: Lead Free
Part Number
Marking
Output Voltage
Package
Operating Temp. Range
AME8861AEEV250
AXCww
2.5V
SOT-25
- 40oC to + 85oC
AME8861AEEV300
AWGww
3.0V
SOT-25
- 40oC to + 85oC
AME8861AEEV330
AXCww
3.3V
SOT-25
- 40oC to + 85oC
Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability.
AME, Inc.
600mA CMOS LDO
AME8861
n Absolute Maximum Ratings
Parameter
Maximum
Unit
8
V
PD / (VIN - VO)
A
GND - 0.3 to VIN + 0.3
V
Input Voltage
Output Current
Input, Output Voltage
ESD Classification
B
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
n Recommended Operating Conditions
Parameter
Ambient Temperature Range
Junction Temperature
Rating
Unit
- 40 to + 85
o
- 40 to + 125
o
C
C
n Thermal Information
Parameter
Thermal Resistance (θja)
Internal Power Dissipation (PD )
(DT = 100oC)
Maximum
SOT-25
260
SOT-25
380
Unit
o
C/W
mW
Maximum Junction Temperature
150
o
Maximum Lead Temperature (10 Sec)
300
o
C
C
3
AME, Inc.
600mA CMOS LDO
AME8861
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=600mA
1.4V<VO(NOM)<=2.0V
VO=VO(NOM) -2.0%
2.0V<VO(NOM)<=2.8V
1900
See 1400
chart 800
2.8V<VO(NOM)
mV
600
IO
VO>1.2V
600
Current Limit
ILIM
VO>1.2V
600
Short Circuit Current
ISC
VO<0.8V
300
600
mA
Quiescent Current
IQ
IO=0mA
30
50
µA
Ground Pin Current
IGND
IO=1mA to 600mA
35
Output Current
Line Regulation
Load Regulation
REGLINE
REGLOAD
mA
800
mA
µA
1.3V <= VO <= 1.4V
-0.2
0.2
IO=1mA
1.4V < VO <= 2.0V
-0.15
0.15
VIN =V O+1 to VO+2
2.0V < VO < 4.0V
-0.1
0.02
0.1
V O >= 4.0V
-0.4
0.2
0.4
0.2
1
%
IO=1mA to 600mA
%
Over Temperature Shutdown
OTS
150
o
Over Temperature Hysterisis
OTH
30
o
TC
30
V O Temperature Coefficient
Power Supply Rejection
Output Voltage Noise
PSRR
eN
IO=100mA
f=1kHz
75
CO=2.2µF ceramic
f=10kHz
55
CBY P=0.01µF
f=100kHz
30
f=10Hz to 100kHz
IO=10mA,
Co=2.2µF
30
C
C
ppm/ oC
dB
µVrms
CBY P=0.01µF
VEH
VIN =2.7V to 7V
2.0
Vin
V
V EL
VIN =2.7V to 7V
0
0.4
V
IEH
VEN =V IN , V IN =2.7V to 7V
0.1
µA
IEL
VEN =0V, VIN =2.7V to 7V
0.5
µA
Shutdown Supply Current
ISD
V IN =5V, V O=0V, V EN <VEL
1
µA
PG Leakage Current
ILC
V PG=7V
1
µA
EN Input Threshold
EN Input Bias Current
0.5
Note1: VIN(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.
4
AME, Inc.
600mA CMOS LDO
AME8861
n Detailed Description
The AME8861 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 600mA. During thermal shutdown,
the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC.
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.
The AME8861 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress. The AME8861 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 AME8861 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.
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.
5
AME, Inc.
600mA CMOS LDO
AME8861
Ground Current vs. Input Voltage
Load Step (1mA-600mA)
Vo(10mV/DIV)
45
85 O C
35
30
Output
C L=2.2µF
CIN=2.2µF
25
O
25 C
20
IL(200mA/DIV)
Ground Current (µ
µ A)
40
15
10
5
ILoad
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
1200
ILOAD=600mA
800
600
400
100m A
C L =2.2µF T antalum
C B Y P =0
-2 0
PSRR (dB)
Drop Out Voltage (V)
-1 0
1000
-3 0
-4 0
-5 0
10m A
100m A
-6 0
200
-7 0
100 µ A
100 µA
1m A
-8 0
0
1
2
3
4
5
10
6
1K
10M
100K
Frequency (Hz)
Output Voltage (V)
Safe Operating Area
Power Supply Rejection Ratio
-2 0
100m A
650
400
PSRR (dB)
Output Current (mA)
-3 0
270
1m A
-4 0
-5 0
100m A
-6 0
-7 0
1.2
2
3
Input-Output Voltage Differential (V)
6
C L =2.2µF T antalum
C B Y P =1000pF
-8 0
10
10m A
100µA
100µA
1K
100K
Frequency (Hz)
10M
AME, Inc.
600mA CMOS LDO
AME8861
Overtemperature Shutdown
OUT
Vo (1mV DIV)
(200mA/DIV)
Noise Measurement
0
R L O A D =6.6 Ω
VOUT (1V/DIV)
I
C L =2.2µF
N o Filter
0
TIM E (20m s/DIV)
TIM E (0.5Sec/DIV)
Short Circuit Response
IOUT (200mV/DIV)
C L O A D =2.2µF
C IN =1.0µF
R L O A D =3.3Ω
V O U T N O M =3.3V
TIM E (2m S/DIV)
TIM E (2m S/DIV)
C L =2µF
R L =10Ω
0
0
VIN(1V/DIV)
Line Transient Response
VOUT (10mV/DIV)
Output (1V/DIV) Enable (2V/DIV)
Chip Enable Transient Response
TIM E ( 1m S/DIV)
C L O A D =2.2µF
C IN =1µF
R L O A D <100m Ω
VOUT (1V/DIV)
IOUT (200mA/DIV)
VOUT (1V/DIV)
Current Limit Response
C L O A D =2.2µF
I L O A D =1m A
V O U T D C =3.3V
V IN D C =4.5V
TIM E (200m S/DIV)
7
AME, Inc.
600mA CMOS LDO
AME8861
n Package Dimension
SOT-25
Top View
Side View
SYMBOLS
MIN
E
H
L
D
£ c
1
S1
A
0.0000
0.0059
b
0.30
0.55
0.0118
0.0217
D
2.70
3.10
0.1063
0.1220
E
1.40
1.80
0.0551
0.0709
e
è1
A
A1
MAX
0.0472REF
0.15
S1
8
MIN
0.00
L
Front View
MAX
1.20REF
INCHES
A1
H
e
b
MILLIMETERS
1.90 BSC
2.60
3.00
0.37BSC
0o
10o
0.95BSC
0.07480 BSC
0.10236 0.11811
0.0146BSC
0o
10 o
0.0374BSC
www.ame.com.tw
E-Mail: sales@ame.com.tw
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 2003
Document: 2006-DS8861-D
Corporate Headquarter
U.S.A. (Subsidiary)
AME, Inc.
Analog Microelectronics, Inc.
2F, 189 Kang-Chien Road, Nei-Hu District
Taipei 114, Taiwan, R.O.C.
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Santa Clara, CA. 95054-2046
Tel: 886 2 2627-8687
Fax: 886 2 2659-2989
Tel : (408) 988-2388
Fax : (408) 988-2489