AME8861AEEV330L [AME]
600mA CMOS LDO; 600毫安CMOS LDO
| 型号： | AME8861AEEV330L |
| 厂家： | 
ANALOG MICROELECTRONICS |
| 描述： | 600mA CMOS LDO |
| 文件： | 总9页 (文件大小：142K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AME, Inc.
600mA CMOS LDO
AME8861
n General Description
n Functional Block Diagram
IN
OUT
The AME8861 family of positive, linear regulators fea-
ture 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.
Overcurrent
Shutdown
Thermal
Shutdown
These rugged devices have both Thermal Shutdown,
and Current Fold-back to prevent device failure under the
"Worst" of operating conditions.
EN
BYP
R1
In applications requiring a low noise, regulated supply,
place a 1000 pF capacitor between Bypass and ground.
AMP
The AME8861 is stable with an output capacitance of
2.2µF or greater.
R2
Vref=1.215V
n Features
GND
l Very Low Dropout Voltage
l 600mA Output
l Accurate to within 1.5%
l 30µA Quiescent Current
l Over-Temperature Shutdown
l Current Limiting
n Typical Application
INPUT
OUTPUT
OUT
IN
l Short Circuit Current Fold-back
l Noise Reduction Bypass Capacitor
l Power-Saving Shutdown Mode
l Space-Saving SOT-25 Package
l Factory Pre-set Output Voltages
l Low Temperature Coefficient
AME8861
BYP
EN
GND
C1
C2
1000pF
C3
5V
1µF
2.2µF
nApplications
l Instrumentation
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
l Battery Powered Widgets
l Electronic Scales
1
AME, Inc.
600mA CMOS LDO
AME8861
n Pin Configuration
SOT-25
Top View
5
4
AME8861
1. IN
2. GND
3. EN
AME8861
4. BYP
5. OUT
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
Operating
Temperature
Range
Number
of
Pins
Pin
Package Type
Voltage
Special Feature
Configuration
-40OC to 85OC
A: 1. IN
2. GND
3. EN
E:
E: SOT-2X
V: 5
300: V=3.0V
250: V=2.5V
330: V=3.3V
L: Low Profile
Y: Lead Free & Low Profile
Z: Lead Free
4. BYP
5. OUT
Part Number
Marking
Output Voltage Package Operating Temp. Range
- 40oC to + 85oC
- 40oC to + 85oC
- 40oC to + 85oC
AME8861AEEV250
AME8861AEEV300
AME8861AEEV330
AXCww
2.5V
3.0V
3.3V
SOT-25
SOT-25
SOT-25
AWGww
AXCww
Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability.
2
AME, Inc.
600mA CMOS LDO
AME8861
n Absolute Maximum Ratings
Parameter
Input Voltage
Maximum
Unit
8
PD / (VIN - VO)
GND - 0.3 to VIN + 0.3
B
V
A
V
Output Current
Input, Output Voltage
ESD Classification
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
- 40 to + 85
- 40 to + 125
Unit
oC
oC
n Thermal Information
Parameter
Maximum
Unit
oC / W
Thermal Resistance (
)
SOT-25
SOT-25
260
θja
Internal Power Dissipation (PD)
(DT = 100oC)
380
mW
oC
oC
Maximum Junction Temperature
150
300
Maximum Lead Temperature (10 Sec)
3
AME, Inc.
600mA CMOS LDO
AME8861
n Electrical Specifications
TA = 25OC unless otherwise noted
Parameter
Input Voltage
Test Condition
Symbol
VIN
Min
Typ Max Units
Note 1
-1.5
7
V
Output Voltage Accuracy
Dropout Voltage
VO
IO=1mA
1.5
%
1.3V<=VO(NOM)<=1.4V
1900
1.4V<VO(NOM)<=2.0V
2.0V<VO(NOM)<=2.8V
2.8V<VO(NOM)
1400
800
IO=600mA
See
chart
VDROPOUT
mV
VO=VO(NOM) -2.0%
600
Output Current
IO
ILIM
ISC
IQ
VO>1.2V
600
600
mA
mA
mA
Current Limit
VO>1.2V
VO<0.8V
800
Short Circuit Current
Quiescent Current
Ground Pin Current
300 600
IO=0mA
30
35
50
A
µ
IGND
IO=1mA to 600mA
A
µ
1.3V <= VO <= 1.4V
-0.2
-0.15
-0.1
0.2
1.4V < VO <= 2.0V
2.0V < VO < 4.0V
VO >= 4.0V
0.15
IO=1mA
Line Regulation
REGLINE
%
VIN=VO+1 to VO+2
0.02 0.1
-0.4
0.2
0.2
150
30
0.4
1
Load Regulation
REGLOAD
OTS
IO=1mA to 600mA
%
oC
Over Temperature Shutdown
Over Temperature Hysterisis
VO Temperature Coefficient
oC
OTH
ppm/oC
TC
30
f=1kHz
f=10kHz
f=100kHz
75
IO=100mA
Power Supply Rejection
PSRR C =2.2 F ceramic
55
dB
µ
O
CBYP=0.01 F
µ
30
f=10Hz to 100kHz
IO=10mA,
Output Voltage Noise
EN Input Threshold
eN
Co=2.2 F
30
Vrms
µ
µ
CBYP=0.01 F
µ
VEH
VEL
IEH
IEL
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
VEN=0V, VIN=2.7V to 7V
VIN=5V, VO=0V, VEN<VEL
VPG=7V
A
µ
EN Input Bias Current
A
µ
Shutdown Supply Current
ISD
ILC
0.5
A
µ
PG Leakage Current
1
A
µ
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
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 Detailed Description
The AME8861 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
n Enable
The P-channel pass transistor receives data from the
error amplifier, over-current shutdown, and thermal pro-
tection circuits. During normal operation, the error ampli-
fier compares the output voltage to a precision reference.
Over-current and Thermal shutdown circuits become ac-
tive when the junction temperature exceeds 150oC, or
the current exceeds 600mA. During thermal shutdown,
the output voltage remains low. Normal operation is re-
stored when the junction temperature drops below 120oC.
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 qui-
escent 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 incorpo-
rates current foldback to reduce power dissipation when
the output is short circuited. This feature becomes ac-
tive 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. Con-
versely, Aluminum Electrolytic capacitors exhibit the high-
est ESR, resulting in the poorest AC response. Unfortu-
nately, 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 in-
put 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 BY-
PASS 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 rejec-
tion, 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)
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
1200
1000
800
600
400
200
0
-10
100m A
ILOAD=600mA
CL =2.2
µF Tantalum
-20
-30
-40
-50
-60
-70
-80
C
BYP =0
10m A
1m A
100m A
100
µ
A
100
µ
A
10
1K
100K
10M
1
2
3
4
5
6
Frequency (Hz)
Output Voltage (V)
Safe Operating Area
Power Supply Rejection Ratio
-20
100m A
650
-30
-40
µ
CL=2.2 F Tantalum
C
BYP=1000pF
400
270
1m A
-50
-60
100m A
10m A
-70
-80
µ
A
100
µ
A
100
10
1K
100K
10M
1.2
2
3
Frequency (Hz)
Input-Output Voltage Differential (V)
6
AME, Inc.
600mA CMOS LDO
AME8861
Noise Measurement
Overtemperature Shutdown
0
0
CL=2.2
No Filter
µF
R LO AD=6.6
Ω
TIME (20ms/DIV)
TIME (0.5Sec/DIV)
Current Limit Response
Short Circuit Response
CLO AD =2.2
IN =1
LO AD <100m
µF
µF
C
R
Ω
CLO AD =2.2
IN =1.0
LO AD =3.3
VO U TN O M =3.3V
µF
C
µF
R
Ω
TIME (2mS/DIV)
TIME (2mS/DIV)
Chip Enable Transient Response
Line Transient Response
CL=2
µF
RL=10
Ω
CLO AD =2.2
LO AD =1m A
O U TD C=3.3V
IN D C =4.5V
µF
0
0
I
V
V
TIME ( 1mS/DIV)
TIME (200mS/DIV)
7
AME, Inc.
600mA CMOS LDO
AME8861
n Package Dimension
SOT-25
MILLIMETERS
INCHES
MIN MAX
Top View
Side View
SYMBOLS
MIN
MAX
D
1.20REF
0.0472REF
A
A1
b
0.00
0.30
2.70
1.40
0.15
0.55
3.10
1.80
0.0000 0.0059
0.0118 0.0217
0.1063 0.1220
0.0551 0.0709
0.07480 BSC
D
E
e
1.90 BSC
£ c1
S1
e
2.60
3.00
0.10236 0.11811
0.0146BSC
H
L
0.37BSC
0o
10o
0o
10o
è1
S1
Front View
0.95BSC
0.0374BSC
b
8
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
AME, Inc.
2F, 189 Kang-Chien Road, Nei-Hu District
Taipei 114, Taiwan, R.O.C.
Tel: 886 2 2627-8687
U.S.A. (Subsidiary)
Analog Microelectronics, Inc.
3100 De La Cruz Blvd., Suite 201
Santa Clara, CA. 95054-2046
Tel : (408) 988-2388
Fax: 886 2 2659-2989
Fax : (408) 988-2489
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