AME, Inc.
1
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Rev.A.01
n Typical Application
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
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 TA= 25oC.
The AME8821 is stable with an output capacitance of
4.7µF or larger.
n General Description
n Features
n Applications
l Instrumentation
l Portable Electronics
l Wireless Devices
l Cordless Phones
l PC Peripherals
l Battery Powered Widgets
n Function Block Diagram
* AME8821A: ENB, AME8821B: EN
4.7µF+
1µFAME8821A
GND OUT
IN
ENB
SR
0.01µF
VIN
1µFAME8821B
GND OUT
IN
EN
SR
4.7µF+0.01µF
VIN
AMP Current Limit
/ Thermal
Protection
10KΩ
GND
SR
VIN VOUT
Vref
R1
R2
* ENB or EN
AME, Inc.
2
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821
Rev.A.01
n Pin Configuration
SOT-25/TSOT-25
Top View AME8821AEEV
1. IN
2. GND
3. ENB
4. SR
5. OUT
* Die Attach:
Conductive Epoxy
n Pin Description
SOT-25/TSOT-25
Top View AME8821BEEV
1. IN
2. GND
3. EN
4. SR
5. OUT
* Die Attach:
Conductive Epoxy
1 32
54
AME8821
1 32
54
AME8821
Pin Number Pin Name Pin Description
1IN Input voltage pin.
It should be decoupled with 1µF or greater capacitor.
2GND Ground connection pin.
EN Enable pin.
When pulled low, the PMOS pass transistor turns off, current
consuming less than 1µA.
ENB Enable bar pin.
When pulled high, the PMOS pass transistor turns off, current
consuming less than 1µA.
4SR The SR(Slew Rate) terminal is used to control the VOUT in-rush
current.
5OUT LDO voltage regulator output pin.
It should be decoupled with a 4.7µF or greater value low ESR
ceramic capacitor.
3
AME, Inc.
3
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Rev.A.01
n Ordering Information
Operating Ambient Temperature Range
Number of Pins
Package Type
Pin Configuration
Special Feature
AME8821 x x x x xxx x
Output Voltage
A:
1. IN
E:
-40
O
C to 85
O
C
E:
SOT-2X
V:
5
180:
V=1.8V
Y:
Lead free & Low profile
(SOT-25)
2. GND
250:
V=2.5V
Z:
Lead free
(TSOT-25)
3. ENB
285:
V=2.85V
4. SR
300:
V=3.0V
5. OUT
330:
V=3.3V
B:
1. IN
(SOT-25)
2. GND
(TSOT-25)
3. EN
4. SR
5. OUT
Special Feature
Pin
Configuration Output
Voltage
Operating Ambient
Temperature
Range
Package
Type
Number
of
Pins
AME, Inc.
4
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821
Rev.A.01
n Ordering Information
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.
Part Number Marking* Output Voltage Package Operating Ambient
Temperature Range
AME8821AEEV180Z BHXww 1.8V SOT-25 - 40oC to 85oC
AME8821AEEV180Y BHXww 1.8V TSOT-25 - 40oC to 85oC
AME8821AEEV250Z BHYww 2.5V SOT-25 - 40oC to 85oC
AME8821AEEV250Y BHYww 2.5V TSOT-25 - 40oC to 85oC
AME8821AEEV285Z BHZww 2.85V SOT-25 - 40oC to 85oC
AME8821AEEV285Y BHZww 2.85V TSOT-25 - 40oC to 85oC
AME8821AEEV300Z BIAww 3.0V SOT-25 - 40oC to 85oC
AME8821AEEV300Y BIAww 3.0V TSOT-25 - 40oC to 85oC
AME8821AEEV330Z BIBww 3.3V SOT-25 - 40oC to 85oC
AME8821AEEV330Y BIBww 3.3V TSOT-25 - 40oC to 85oC
AME8821BEEV180Z BICww 1.8V SOT-25 - 40oC to 85oC
AME8821BEEV180Y BICww 1.8V TSOT-25 - 40oC to 85oC
AME8821BEEV250Z BIDww 2.5V SOT-25 - 40oC to 85oC
AME8821BEEV250Y BIDww 2.5V TSOT-25 - 40oC to 85oC
AME8821BEEV285Z BIEww 2.85V SOT-25 - 40oC to 85oC
AME8821BEEV285Y BIEww 2.85V TSOT-25 - 40oC to 85oC
AME8821BEEV300Z BIFww 3.0V SOT-25 - 40oC to 85oC
AME8821BEEV300Y BIFww 3.0V TSOT-25 - 40oC to 85oC
AME8821BEEV330Z BIGww 3.3V SOT-25 - 40oC to 85oC
AME8821BEEV330Y BIGww 3.3V TSOT-25 - 40oC to 85oC
AME, Inc.
5
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Rev.A.01
n Absolute Maximum Ratings
n Recommended Operating Conditions
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
* HBM C: 4000V+
Parameter Maximum Unit
Input Voltage 6V
Output Current PD / (V IN - VOUT)mA
Output Voltage GND-0.3 to VIN+0.3 V
ESD Classification C*
* Measure θJC on center of molding compound if IC has no tab.
** MIL-STD-202G 210F
n Thermal Information
Parameter Symbol Rating Unit
Ambient Temperature Range TA- 40 to 85
Junction Temperature Range TJ- 40 to 125
Storage Temperature Range TSTG -65 to 150
oC
Parameter Package Die Attach Symbol Maximum Unit
Thermal Resistance*
(Junction to Case) θJC 81
Thermal Resistance
(Junction to Ambient) θJA 260
Internal Power Dissipation PD400 mW
350 oC
Conductive Epoxy
Solder Iron (10 Sec)**
oC / W
SOT-25
TSOT-25
AME, Inc.
6
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821
Rev.A.01
Parameter Symbol Min Typ Max Units
Input Voltage VIN Note1 5.5 V
-1.5 1.5
-3 3
-0.30 0.2 0.3
-0.40 0.4
-0.25 0.15 0.25
-0.35 0.35
-0.25 0.15 0.25
-0.35 0.35
-0.25 0.15 0.25
-0.35 0.35
-0.2 0.1 0.2
-0.3 0.3
Output Current IOUT 250 mA
Output Current Limit ILIM 300 350 750 mA
17 25
30
Output Voltage Load
Regulation
Test Condition
(See Note2)
VOUT(nom)
Output Voltage Accuracy
%/V
TA = 25oC
TA = 25oC
TA = 25oC
TJ = -40 oC to 125oC
TA = 25oC
TJ = -40 oC to 125oC
TA = 25oC
0.1 %/mA-0.1 0.0025
TJ = -40 oC to 125oC
TA = 25oC
TJ = -40 oC to 125oC
TJ = -40 oC to 125oC
Quiescent Current IQ
VOUT = 1.8V,
2.5V < VIN < 5.5V
Output Voltage Line
Regulation
REGLINE
VOUT = 3.0V,
3.5V < VIN < 5.5V
VOUT = 2.85V,
3.3V < VIN < 5.5V
VOUT = 3.3V,
3.8V < VIN < 5.5V
VOUT = 2.5V,
3V < VIN < 5.5V
REGLOAD 1mA <= IOUT <= 250mA TA = 25oC
%
TJ = -40oC to 125oC
µA
VOUT = 0V, TA = 25oC
TA = 25oC10µA < IOUT < 250mA
10µA < IOUT < 250mA TJ = -40 oC to 125oC
∆VOUT x ∆VIN
VOUT x 100%
∆VOUT
VOUT x 100%
∆ IOUT
n Electrical Specifications
Note1 : VIN = VOUT + VDROP
Note2 : Continuous output current and operating junction temperature are limited by internal protection circuitry,
but it is not recommended that the device operate under conditions beyond those specified in this table for
extended periods of time.
Over operating temperature range(TJ = -40oC to 125oC), VIN = VOUT(nom) + 1V, or VIN = VIN(min) whichever is greater, IOUT =
1mA, VEN = VIN(VENB = 0), and COUT = 4.7µF, CIN = 1µF unless otherwise noted. Typical values are at TA = 25oC.
AME, Inc.
7
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Rev.A.01
n Electrical Specifications (contd.)
Parameter Symbol Min Typ Max Units
1000 1100
1200
500 600
650
400 550
600
400 550
600
400 550
600
Thermal Shutdown Temerature
TSHDN 150
Temerature Hysterisis THYS 20
Output Voltage Temperature
Coefficient TC30 ppm
Enable Bar High (Shutdown) VENB(HI)
Enable High (Enabled) VEN(HI)
Enable Bar Low (Enabled) VENB(LO)
Enable Low (Shutdown) VEN(LO)
Enable / Enable Bar Pin
Current (Enabled) IEN / IENB 0.1 1µA
Shutdown Current ISHDN 1 2 µA
20
200
450
Thermal shutdown increasing
COUT = 4.7µF,
C(SR) = 0.47 µF
TA = 25oC
mV
TA = 25oC
TJ = -40 oC to 125oC
VDROP
TJ = -40 oC to 125oC
TA = 25oC
TJ = -40 oC to 125oC
TA = 25oC
TJ = -40 oC to 125oC
TA = 25oCDropout Voltage @ VOUT =
VOUT(nom) - 2%VOUT(nom)
VOUT(nom) = 2.5V
IOUT = 250mA
VOUT(nom) = 2.85V
IOUT = 250mA
VOUT(nom) = 3V
IOUT = 250mA
VOUT(nom) = 3.3V
IOUT = 250mA
VOUT(nom) = 1.8V
IOUT = 250mA
Power Supply Ripple
Rejection PSRR
Output Voltage Noise eN
Test Condition
oC
100
mS
V
µVRMS
dB
Start up Time TSTR
VOUT = 3.3V
RLOAD = 22Ω
COUT = 10µF
C(SR) = 0.01µF
C(SR) = 0.1µF
C(SR) = 0.22µF
TA = 25oC
ENB = VIN, EN = 0, VIN = 2.5V to 5.5V
VOUT = 3.3V, f = 1KHz,
IOUT = 100mA
COUT = 4.7µF
C(SR) = 0.01 µF
ENB = 0, EN = VIN, VIN = 2.5V to 5.5V
TA = 25oC
BW = 200Hz to 100KHz
IOUT = 250mA
TJ = -40 oC to 125oC
TA = 25oC
VIN
00.3
65
VIN = 2.5V to 5.5V
1.4
AME, Inc.
8
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821
Rev.A.01
n Detail Description
The AME8821 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error ampli-
fier, over-current protection, and thermal shutdown func-
tion.
The P-channel pass transistor receives data from
the error amplifier, over-current limit, and thermal pro-
tection 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 about 350mA. During
thermal shutdown, the output voltage remains low.
Normal operation is restored when the junction tem-
perature drops below 130oC.
The AME8821 switches from voltage mode to cur-
rent mode when the load exceeds the rated output
current. This prevents over-stress.
n External Capacitors
The AME8821 is stable with an output capacitor to
ground of 4.7µF or greater. Ceramic capacitors have
the lower ESR, and will offer the best AC performance.
Conversely, Aluminum Electrolytic capacitors exhibit
the higher ESR, resulting in the poor AC response.
Unfortunately, large value ceramic capacitors are com-
paratively 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 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
n Enable
The Enable pin is optional. EN for active high en-
able, ENB for active low enable. When disable the
Enable Pin EN = 0, ENB = VIN, the PMOS pass tran-
sistor shuts off, and all internal circuits are powered
down. In this state, the standby current is less than
1µA.
AME, Inc.
9
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Rev.A.01
Dropout Voltage vs. Temperature
Output Voltage vs Load Current Quiescent Current vs Temperature
Output Spectral Noise Density vs. Frequency
Output Impedance vs. Frequency Power Supply Ripple Rejection Ratio
0
50
100
150
200
250
300
350
400
-40 -25 -10 520 35 50 65 80 95 110 125
Temperature (oC)
Dropout Voltage (V)
VIN = 4.3V
IOUT = 250mA
Noise (µV/√Hz)
0
100
200
300
400
100 1000 10000 100000
Frequency (Hz)
IOUT = 250mA
IOUT =1mA
VIN=4.3V
COUT=4.7µF
C(SR)=0.47µF
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
10 100 1000 10000 100000 1000000
Frequency (Hz)
Output Impedance (Ω)
IOUT = 50mA
VIN = 4.3V
COUT = 4.7µF
IOUT = 250mA
0
5
10
15
20
25
30
-40 -25 -10 5 20 35 50 65 80 95 110 125
VIN = 4.3V
IOUT = 1mA
IOUT = 250mA
Temperature (oC)
Quiescent Current (µA)
3.260
3.265
3.270
3.275
3.280
3.285
3.290
3.295
3.300
3.305
3.310
0 15 30 45 60 75 90 105 120135150165180195210225240
Load Current (mA)
Output Voltage (V)
VIN = 4.3V
TA = 25oC
0
10
20
30
40
50
60
70
80
90
100
10 100 1000 10000 100000 1000000
Frequency (Hz)
Ripple Rejection (dB)
IOUT = 250mA
IOUT = 1mA
VIN = 4.3V
VOUT = 3.3V
COUT = 4.7µF
C(SR) = 0.47µF
AME, Inc.
10
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821
Rev.A.01
Line Transient Response Load Transient Response
Output Voltage, Enable Voltage vs Time
(Start-Up) Output Voltage, Enable Voltage vs Time
(Start-Up)
Output Voltage vs. Temperature
Time (20µS/Div)
5.3
4.3
Input Voltage
(V)
Output Voltage
(mV)
20
0
-20
Output Voltage, Enable Voltage vs Time
(Start-Up)
3.235
3.240
3.245
3.250
3.255
3.260
3.265
3.270
3.275
3.280
3.285
3.290
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (oC)
Output Voltage (V)
VIN = 4.3V IOUT = 250mA
IOUT = 1mA
Enable Voltage
(V)
Output Voltage
(V)
Time (100mS/Div)
5
0
3
2
1
0
VIN = 4.3V
VOUT = 3.3V
IOUT = 250mA
C(SR) = 0.1µF
COUT = 4.7µF
TA = 25℃
Time (10mS/Div)
Enable Voltage
(V)
Output Voltage
(V)
5
0
3
2
1
0
VIN = 4.3V
VOUT = 3.3V
IOUT = 250mA
C(SR) = 0.01µF
COUT = 4.7µF
TA = 25℃
Enable Voltage
(V)
Output Voltage
(V)
5
0
3
2
1
0
Time (100mS/Div)
VIN = 4.3V
VOUT = 3.3V
IOUT = 250mA
C(SR) = 0.22µF
COUT = 4.7µF
TA = 25℃
Time (20µS/Div)
Output Current
(mA)
Output Voltage
(mV)
300
200
100
0
100
0
-100
VIN = 4.3V
VOUT = 3.3V
COUT = 4.7µF
AME, Inc.
11
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Rev.A.01
Stability vs ESR vs ILOAD
0.1
1
10
100
0 60 90 120 150
ILOAD (mA)
ESR (Ω)
Stable Region
Unstable Region
Untested Region
VIN = 4.3V
VOUT = 3.3V
COUT= 4.7µF
AME, Inc.
12
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821
Rev.A.01
Year
A A A WWxxx0
A A A WWxxx1
A A A WWxxx2
A A A WWxxx3
A A A WWxxx4
A A A WWxxx5
A A A WWxxx6
A A A WWxxx7
A A A WWxxx8
A A A WWxxx9
Marking Date Code
n Date Code Rule
n Tape and Reel Dimension
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
SOT-25 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm
Carrier Tape, Number of Components Per Reel and Reel Size
SOT-25
W
P
AME AME
PIN 1
AME, Inc.
13
AME8821
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
Rev.A.01
n Tape and Reel Dimension
Carrier Tape, Number of Components Per Reel and Reel Size
W
P
AME AME
PIN 1
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
TSOT-25 8.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm
TSOT-25
AME, Inc.
14
250mA Hi-PSRR, Low-Quiescent LDO
with In-Rush Current Control
For USB Application
AME8821
Rev.A.01
n Package Dimension
SOT-25
TSOT-25
MIN MAX MIN MAX
A
A10.00 0.15 0.0000 0.0059
b0.30 0.55 0.0118 0.0217
D2.70 3.10 0.1063 0.1220
E1.40 1.80 0.0551 0.0709
e
H2.60 3.00 0.10236 0.11811
L
θ10o10o0o10o
S1
0.37BSC 0.0146BSC
0.95BSC 0.0374BSC
1.90 BSC 0.07480 BSC
SYMBOLS MILLIMETERS INCHES
1.20REF 0.0472REF
L
Top View Side View
Front View
θ1
D
S1
e
E
H
A1
b
A
L
Top View Side View
Front View
θ1
D
S1
e
E
H
A1
b
A
MIN MAX MIN MAX
A+A10.90 1.25 0.0354 0.0492
b0.30 0.50 0.0118 0.0197
D2.70 3.10 0.1063 0.1220
E1.40 1.80 0.0551 0.0709
e
H2.40 3.00 0.09449 0.11811
L
θ10o10o0o10o
S1
1.90 BSC 0.07480 BSC
SYMBOLS MILLIMETERS INCHES
0.35BSC 0.0138BSC
0.95BSC 0.0374BSC
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. , July 2007
Document: 1009-DS8821-A.01
Corporate Headquarter U.S.A.(Subsidiary)
AME, Inc. Analog Microelectronics, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District 3100 De La Cruz Blvd., Suite 201
Taipei 114, Taiwan. Santa Clara, CA. 95054-2438
Tel: 886 2 2627-8687 Tel : (408) 988-2388
Fax: 886 2 2659-2989 Fax: (408) 988-2489
www.ame.com.tw
E-Mail: sales@ame.com.tw
