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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 feature low quiescent current (17A 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 1A typical at T A= 25oC. The AME8821 is stable with an output capacitance of 4.7F or larger.
n Function Block Diagram
VIN * ENB or EN 10K AMP Vref GND R2 SR Current Limit / Thermal Protection R1 VOUT
* AME8821A: ENB, AME8821B: EN
n Features
l Guaranteed 250mA Output l 17A 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
VIN 1F
IN SR
AME8821A
ENB GND OUT
0.01F + 4.7F
VIN 1F
IN
SR
AME8821B
EN GND OUT
0.01F + 4.7F
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 1F or greater capacitor. Ground connection pin. Enable pin. When pulled low, the PMOS pass transistor turns off, current consuming less than 1A. Enable bar pin. When pulled high, the PMOS pass transistor turns off, current consuming less than 1A. The SR(Slew Rate) terminal is used to control the VOUT in-rush current. LDO voltage regulator output pin. It should be decoupled with a 4.7F 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: -40OC to 85OC
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. 2. (TSOT-25) 3. 4. 5.
(SOT-25)
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
- 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC - 40oC to 85oC
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 PD / (V IN - VOUT) GND-0.3 to VIN+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
TA TJ TSTG
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
JC JA PD
Maximum
81
Unit
o
C/W
260
400 350
mW
o
C
* Measure JC on center of molding compound if IC has no tab. ** MIL-STD-202G 210F
Rev.A.01
5
AME, Inc.
AME8821
n Electrical Specifications
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
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 = 4.7F, CIN = 1F unless otherwise noted. Typical values are at T A = 25oC.
Parameter Input Voltage Output Voltage Accuracy Symbol VIN VOUT(nom) TA = 25 C TJ = -40oC to 125oC VOUT = 1.8V, 2.5V < VIN < 5.5V Output Voltage Line Regulation VOUT = 2.5V, 3V < VIN < 5.5V REGLINE VOUT = 2.85V, 3.3V < VIN < 5.5V VOUT = 3.0V, 3.5V < VIN < 5.5V VOUT = 3.3V, 3.8V < VIN < 5.5V Output Current Output Current Limit Quiescent Current Output Voltage Load Regulation IOUT ILIM IQ TA = 25oC
o o
Test Condition
Min Note1 -1.5 -3 -0.30
Typ
Max 5.5 1.5 3
Units V %
0.2
0.3 0.4
TJ = -40oC to 125oC -0.40 TA = 25 C
o
-0.25
0.15
0.25 0.35
TJ = -40oC to 125oC -0.35 TA = 25 C TA = 25oC
o
VOUT x VIN VOUT
-0.25
0.15
0.25 0.35
x 100%
TJ = -40oC to 125oC -0.35 -0.25 0.15 TJ = -40oC to 125oC -0.35 TA = 25 C TJ = -40oC to 125oC -0.2 -0.3 250 300
o
%/V
0.25 0.35
0.1
0.2 0.3 mA
(See Note2) VOUT = 0V, TA = 25oC 10A < IOUT < 250mA 10A < IOUT < 250mA TA = 25 C TJ = -40oC to 125oC
350 17
750 25 30
mA A
VOUT VOUT
x 100%
REGLOAD 1mA <= IOUT <= 250mA
TA = 25oC
-0.1
0.0025
0.1
%/mA
IOUT
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.
6
Rev.A.01
AME, Inc.
AME8821
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
n Electrical Specifications (contd.)
Parameter Symbol Test Condition VOUT(nom) = 1.8V IOUT = 250mA VOUT(nom) = 2.5V IOUT = 250mA Dropout Voltage @ VOUT = VOUT(nom) - 2%VOUT(nom) VDROP VOUT(nom) = 2.85V IOUT = 250mA VOUT(nom) = 3V IOUT = 250mA VOUT(nom) = 3.3V IOUT = 250mA Thermal Shutdown Temerature Temerature Hysterisis Output Voltage Temperature Coefficient Power Supply Ripple Rejection TSHDN THYS TC VOUT = 3.3V, f = 1KHz, PSRR IOUT = 100mA COUT = 4.7F C(SR) = 0.01F BW = 200Hz to 100KHz Output Voltage Noise eN IOUT = 250mA COUT = 4.7F, C(SR) = 0.47F Enable Bar High (Shutdown) Enable High (Enabled) Enable Bar Low (Enabled) Enable Low (Shutdown) Enable / Enable Bar Pin Current (Enabled) Shutdown Current VENB(HI) VEN(HI) VENB(LO) VEN(LO) IEN / IENB ISHDN TSTR ENB = 0, EN = VIN, VIN = 2.5V to 5.5V ENB = VIN, EN = 0, VIN = 2.5V to 5.5V VOUT = 3.3V Start up Time RLOAD = 22 COUT = 10F C(SR) = 0.01F C(SR) = 0.1F C(SR) = 0.22F TA = 25 C
o
Min
o o o
Typ 1000 500
Max 1100 1200 600 650 550 600 550 600 550 600
Units
TA = 25 C TJ = -40 C to 125 C TA = 25 C TJ = -40 C to 125 C TA = 25 C TJ = -40 C to 125 C TA = 25oC TJ = -40oC to 125oC TA = 25 C TJ = -40 C to 125 C
o o o o o o o o o
400 400 400
mV
Thermal shutdown increasing
150 20 30
o
C
ppm
TA = 25oC
65
dB
TA = 25oC
100
VRMS
1.4 VIN = 2.5V to 5.5V 0 0.1 1 20 200 450
VIN V 0.3 1 2 A A mS
Rev.A.01
7
AME, Inc.
AME8821
n Detail Description
The AME8821 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown function. The P-channel pass transistor receives data from the error amplifier, over-current limit, 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 about 350mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 130oC. The AME8821 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress.
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
n External Capacitors
The AME8821 is stable with an output capacitor to ground of 4.7F 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 comparatively expensive. One option is to parallel a 0.1F ceramic capacitor with a 10F 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 V IN. The input capacitor should be at least 1F 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 enable, ENB for active low enable. When disable the Enable Pin EN = 0, ENB = VIN, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the standby current is less than 1A.
8
Rev.A.01
AME, Inc.
AME8821
Output Voltage vs Load Current
3.310 3.305
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
Quiescent Current vs Temperature
30 IOUT = 250mA
Quiescent Current (A)
Output Voltage (V)
3.300 3.295 3.290 3.285 3.280 3.275 3.270 3.265 3.260
VIN = 4.3V TA = 25oC
25 IOUT = 1mA
20
15
10
5
VIN = 4.3V
-25 -10 5 20 35 50 65 80 95 110 125
0 15 30 45 60 75 90 105 120135150165 180195 210225 240
Load Current (mA)
0 -40
Temperature (oC)
Dropout Voltage vs. Temperature
400 350
Output Spectral Noise Density vs. Frequency
400
Dropout Voltage (V)
VIN = 4.3V IOUT = 250mA
250 200 150 100 50
Noise (V/OHz)
300
300
VIN=4.3V COUT=4.7F C(SR)=0.47F
200 IOUT = 250mA
100
IOUT =1mA
0 -40
-25
-10
5
20
35
50
65
80
95
110 125
0 100
1000
10000
100000
Temperature (oC)
Frequency (Hz)
Output Impedance vs. Frequency
2.0 1.8
Power Supply Ripple Rejection Ratio
100 90
Output Impedance ()
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 10 100 1000 10000 IOUT = 250mA
Ripple Rejection (dB)
VIN = 4.3V COUT = 4.7F
80 70 60 50 40 30 20 10 IOUT = 1mA IOUT = 250mA
VIN = 4.3V VOUT = 3.3V COUT = 4.7F C(SR) = 0.47F
IOUT = 50mA
100000
1000000
Frequency (Hz)
0 10
100
1000
10000
100000
1000000
Frequency (Hz)
Rev.A.01
9
AME, Inc.
AME8821
Line Transient Response
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
Load Transient Response
Output Voltage Output Current (mV) (mA)
300
Input Voltage (V)
5.3 4.3
VIN = 4.3V VOUT = 3.3V COUT = 4.7F
200 100 0
Output Voltage (mV)
20 0 -20
100 0 -100
Time (20S/Div)
Time (20S/Div)
Output Voltage, Enable Voltage vs Time (Start-Up)
Output Voltage Enable Voltage (V) (V)
Output Voltage, Enable Voltage vs Time (Start-Up)
Output Voltage Enable Voltage (V) (V)
5 0
5 0
3 2 1 0
3 2 1 0
VIN = 4.3V VOUT = 3.3V IOUT = 250mA C(SR) = 0.22F COUT = 4.7F TA = 25J
VIN = 4.3V VOUT = 3.3V IOUT = 250mA C(SR) = 0.01F COUT = 4.7F TA = 25J
Time (100mS/Div)
Time (10mS/Div)
Output Voltage, Enable Voltage vs Time (Start-Up)
Output Voltage Enable Voltage (V) (V)
3.290
5
Output Voltage vs. Temperature
3.285 3.280
IOUT = 1mA
Output Voltage (V)
0
3.275 3.270 3.265 3.260 3.255 3.250 3.245 3.240 3.235 -40 -25 -10 5 20 35 50 65 80 95 110 125 IOUT = 250mA
3 2 1 0
VIN = 4.3V VOUT = 3.3V IOUT = 250mA C(SR) = 0.1F COUT = 4.7F TA = 25J
VIN = 4.3V
Time (100mS/Div)
Temperature (oC)
10
Rev.A.01
AME, Inc.
AME8821
Stability vs ESR vs I LOAD
100
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
Unstable Region
10
VIN = 4.3V VOUT = 3.3V COUT= 4.7F
ESR ()
Stable Region
1
Untested Region
0.1 0 60 90 120 150
ILOAD (mA)
Rev.A.01
11
AME, Inc.
AME8821
n Date Code Rule
Marking A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A Date Code W W W W W W W W W W W W W W W W W W W W Year xxx0 xxx1 xxx2 xxx3 xxx4 xxx5 xxx6 xxx7 xxx8 xxx9
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
n Tape and Reel Dimension
SOT-25
P
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package SOT-25
Carrier Width (W) 8.00.1 mm
Pitch (P) 4.00.1 mm
Part Per Full Reel 3000pcs
Reel Size 1801 mm
12
Rev.A.01
AME, Inc.
AME8821
n Tape and Reel Dimension
TSOT-25
P
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package TSOT-25
Carrier Width (W) 8.00.1 mm
Pitch (P) 4.00.1 mm
Part Per Full Reel 3000pcs
Reel Size 1801 mm
Rev.A.01
13
AME, Inc.
AME8821
n Package Dimension
SOT-25
Top View D
250mA Hi-PSRR, Low-Quiescent LDO with In-Rush Current Control For USB Application
Side View
SYMBOLS
L
MILLIMETERS MIN MAX
0.15 0.55 3.10 1.80
INCHES MIN
0.0000 0.0118 0.1063 0.0551
MAX
0.0059 0.0217 0.1220 0.0709
A A1 b D E e H L 1
1.20REF 0.00 0.30 2.70 1.40
0.0472REF
H
E
S1 e
c1
1.90 BSC 2.60 3.00
0.07480 BSC 0.10236 0.11811 0.0146BSC
o
0.37BSC 0
o
Front View A
10
0o
10 o
S1
0.95BSC
0.0374BSC
b
TSOT-25
Top View D L Side View
A1
SYMBOLS A+A1
MILLIMETERS MIN
0.90 0.30 2.70 1.40
INCHES MIN
0.0354 0.0118 0.1063 0.0551
MAX
1.25 0.50 3.10 1.80
MAX
0.0492 0.0197 0.1220 0.0709
H
b D E
S1 e c1
E
e H L 1 S1
1.90 BSC 2.40 3.00
0.07480 BSC 0.09449 0.11811 0.0138BSC 0o 10 o
0.35BSC 0o 10 o
Front View A
0.95BSC
0.0374BSC
b
A1
14
Rev.A.01
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. (c) AME, Inc. , July 2007 Document: 1009-DS8821-A.01
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
U.S.A.(Subsidiary)
Analog Microelectronics, Inc.
3100 De La Cruz Blvd., Suite 201 Santa Clara, CA. 95054-2438 Tel : (408) 988-2388 Fax: (408) 988-2489

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