AME, Inc.
AME8821
n
General Description
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
n
Applications
l
Instrumentation
l
Portable Electronics
l
Wireless Devices
l
Cordless Phones
l
PC Peripherals
l
Battery Powered Widgets
The AME8821 family of positive, linear regulators fea-
ture low quiescent current (17µA typ.) with low dropout
voltage, making them ideal for battery applications. The
space-saving SOT-25/TSOT-25 packages are attractive
for
“Pocket”
and
“Hand
Held”applications.
These rugged devices have both Thermal Shutdown,
and Current Limitation to prevent device failure under the
“Worst”
operating conditions. In application requires a
low noise regulated supply. The AME8821 family uses
the SR pin to program the output voltage’s slew rate to
control the in-rush current. This is specifically used in
the USB application where large load capacitance is
present at start-up.
The AME8821 also features a logic-enabled sleep mode
to shutdown the regulator, reducing quiescent current to
1µA typical at T
A
= 25
o
C.
The AME8821 is stable with an output capacitance of
4.7µF or larger.
n
Function Block Diagram
V
IN
* ENB or EN
10KΩ
AMP
V
ref
GND
R2
SR
Current Limit
/ Thermal
Protection
R1
V
OUT
* AME8821A: ENB, AME8821B: EN
n
Features
l
Guaranteed 250mA Output
l
17µA Quiescent Current
l
Over-Temperature Shutdown
l
Over-Current Limitation
l
Noise Reduction SR Capacitor
l
Power-Saving Shutdown Mode
l
Space-Saving SOT-25/TSOT-25 Packages
l
Factory Pre-set Output Voltages
l
Enable pin option
l
ENB active low enable
l
EN active high enable
l
All AME's Lead Free Products Meet RoHS
Standards
n
Typical Application
V
IN
1µF
IN
SR
AME8821A
ENB
GND
OUT
0.01µF
+
4.7µF
V
IN
1µF
IN
SR
AME8821B
EN
GND
OUT
0.01µF
+
4.7µF
Rev.A.01
1
AME, Inc.
AME8821
n
Pin Configuration
SOT-25/TSOT-25
Top View
5
4
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
SOT-25/TSOT-25
Top View
AME8821AEEV
1. IN
2. GND
5
4
AME8821BEEV
1. IN
2. GND
AME8821
3. ENB
4. SR
5. OUT
AME8821
3. EN
4. SR
5. OUT
1
2
3
* Die Attach:
Conductive Epoxy
1
2
3
* Die Attach:
Conductive Epoxy
n
Pin Description
Pin Number
1
2
Pin Name
IN
GND
Pin Description
Input voltage pin.
It should be decoupled with 1
µ
F or greater capacitor.
Ground connection pin.
Enable pin.
When pulled low, the PMOS pass transistor turns off, current
consuming less than 1
µ
A.
Enable bar pin.
When pulled high, the PMOS pass transistor turns off, current
consuming less than 1
µ
A.
The SR(Slew Rate) terminal is used to control the V
OUT
in-rush
current.
LDO voltage regulator output pin.
It should be decoupled with a 4.7
µ
F or greater value low ESR
ceramic capacitor.
EN
3
ENB
4
SR
5
OUT
2
Rev.A.01
AME, Inc.
AME8821
n
Ordering Information
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821 x x x x xxx x
Special Feature
Output Voltage
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Operating Ambient
Temperature
Range
E: -40
O
C to 85
O
C
Pin
Configuration
Package
Type
Number
of
Pins
V: 5
Output
Voltage
Special Feature
A: 1.
(SOT-25)
2.
(TSOT-25)
3.
4.
5.
B: 1.
(SOT-25)
2.
(TSOT-25)
3.
4.
5.
IN
GND
ENB
SR
OUT
IN
GND
EN
SR
OUT
E: SOT-2X
180:
250:
285:
300:
330:
V=1.8V
V=2.5V
V=2.85V
V=3.0V
V=3.3V
Y: Lead free & Low profile
Z: Lead free
Rev.A.01
3
AME, Inc.
AME8821
n
Ordering Information
Part Number
AME8821AEEV180Z
AME8821AEEV180Y
AME8821AEEV250Z
AME8821AEEV250Y
AME8821AEEV285Z
AME8821AEEV285Y
AME8821AEEV300Z
AME8821AEEV300Y
AME8821AEEV330Z
AME8821AEEV330Y
AME8821BEEV180Z
AME8821BEEV180Y
AME8821BEEV250Z
AME8821BEEV250Y
AME8821BEEV285Z
AME8821BEEV285Y
AME8821BEEV300Z
AME8821BEEV300Y
AME8821BEEV330Z
AME8821BEEV330Y
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Marking*
BHXww
BHXww
BHYww
BHYww
BHZww
BHZww
BIAww
BIAww
BIBww
BIBww
BICww
BICww
BIDww
BIDww
BIEww
BIEww
BIFww
BIFww
BIGww
BIGww
Output Voltage
1.8V
1.8V
2.5V
2.5V
2.85V
2.85V
3.0V
3.0V
3.3V
3.3V
1.8V
1.8V
2.5V
2.5V
2.85V
2.85V
3.0V
3.0V
3.3V
3.3V
Package
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
SOT-25
TSOT-25
Operating Ambient
Temperature Range
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
- 40
o
C to 85
o
C
Note: ww represents the date code and pls refer to the Date Code Rule before Package Dimension.
* A line on top of the first character represents lead free plating such as BHXww.
Please consult AME sales office or authorized Rep./Distributor for output voltage and package type availability.
4
Rev.A.01
AME, Inc.
AME8821
n
Absolute Maximum Ratings
Parameter
Input Voltage
Output Current
Output Voltage
ESD Classification
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Maximum
6
P
D
/ (V
IN
- V
OUT
)
GND-0.3 to V
IN
+0.3
C*
Unit
V
mA
V
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
* HBM C: 4000V+
n
Recommended Operating Conditions
Parameter
Ambient Temperature Range
Junction Temperature Range
Storage Temperature Range
Symbol
T
A
T
J
T
STG
Rating
- 40 to 85
- 40 to 125
-65 to 150
Unit
o
C
n
Thermal Information
Parameter
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Internal Power Dissipation
Solder Iron (10 Sec)**
SOT-25
TSOT-25
Conductive Epoxy
Package
Die Attach
Symbol
θ
JC
θ
JA
P
D
Maximum
81
Unit
o
C/W
260
400
350
mW
o
C
* Measure
θ
JC
on center of molding compound if IC has no tab.
** MIL-STD-202G 210F
Rev.A.01
5
嵌入式系统
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