Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
Advanced
AMS500
Monolithic
LOW COST
500mA REGULATOR
Systems
FEATURES
APPLICATIONS
Fixed and Adjustable Versions Available
Cellular Telephones
Output Current up to 500mA
Portable Consumer Equipment
Very Low Quiescent Current
Portable (Notebook) Computers
Reverse Battery Protection
Battery Powered Systems
Input-output Differential less than 0.6V
Portable Instrumentation
Short Circuit Protection
Radio Control Systems
Internal Thermal Overload Protection
CD/DVD drives
Overvoltage Protection
Automotive
ON/OFF Pin
GENERAL DESCRIPTION
The AMS500 series consists of positive fixed and adjustable voltage regulators ideally suited for use in battery-powered systems.
These devices feature very low quiescent current of 0.8mA or less when supplying 50mA loads. This unique characteristic and
the low input-output differential required for proper regulation (0.2V for output currents of 100mA) make the AMS500 ideal to
use for standby power systems.
Internal circuitry of AMS500 is protected from input fault conditions caused by input voltages that exceed maximum rated input
voltage. During line transients, when the input voltage to the regulator can momentarily exceed the specified maximum
operating voltage, the regulator will automatically shut down to protect both internal circuits and the load. The AMS500 series
also includes internal current limiting, thermal shutdown.
The AMS500 is offered in 3 lead TO-92, SOT-89 and 5 leads SOT-23 packages.
ORDERING INFORMATION
OUTPUT
PACKAGE TYPE
TEMP.
VOLTAGE
3L TO-92
SOT-89
SOT-23-5
RANGE
FIXED
AMS500N-X
AMS500L-X
AMS500M1-X
IND
ADJ.
AMS500M1
IND
X = 2.0V, 2.5V, 3.0V, 3.3V, 3.5V, 4.0V, 5.0V.
PIN CONNECTIONS
TO-92
Plastic Package (N)
SOT-89
(L)
5 Lead SOT-23
(M1)
OUTPUT
INPUT
GND
1
2
3
OUTPUT
GND
INPUT
INPUT
OUTPUT
ON/OFF
ADJ / N/C
GROUND
1
2
5
3
4
Bottom View
Top View
Top View
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS500
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage
Maximum Junction Temperature
+125
C
Operating
25V
Storage Temperature
-65
C to +150
C
Overvoltage Protection
26V to 40V
Lead Temperature (Soldering 10 sec)
230
C
Internal Power Dissipation (Note 4)
Internally Limited
ESD
2000V
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at V
IN
=6.3V, I
O
=5mA, T
J
=25C, C2 = 22
F unless otherwise specified.
AMS500-X
PARAMETER
CONDITIONS
Min.
Typ.
Max.
Units
Fixed Output Voltage Versions
Output Voltage Tolerance
-4.0
+4.0
%
6.3V
V
IN
25V, I
O
=100 mA
5.0
%
Line Regulation
6V
V
IN
15V
15V
V
IN
25V
5
5
10
30
mV
mV
Load Regulation
5mA
I
O
100 mA
5mA
10
200 mA
5mA
10
350 mA
5mA
10
500 mA
5
15
20
20
25
40
60
75
mV
mV
mV
mV
Dropout Voltage
I
O
= 100 mA
I
O
= 200 mA
I
O
= 350 mA
I
O
= 500 mA
0.25
0.40
0.45
0.55
0.40
0.50
0.60
0.80
mV
mV
mV
mV
Quiescent Current
I
O
10 mA,
I
O
= 100 mA
I
O
200 mA
I
O
= 350 mA
0.2
2
5
12
0.5
4
10
mA
mA
mA
mA
Output Noise Voltage
10Hz-100kHz, C
OUT
= 100
F
50
V rms
Output Bypass Capacitor
ESR=0.1 to 10
10
F
Ripple Rejection
f
O
=120Hz
80
dB
Maximum Operational Input
Voltage
25
28
V
Maximum Line Transient
R
L
= 500
, V
O
5.5V
T = 1ms,
100ms
35
40
V
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS500
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at V
IN
=6V, V
OUT
=3V I
O
=5mA, T
J
=25C, R1 =27k, C2 = 2
F unless otherwise specified.
AMS500-X
PARAMETER
CONDITIONS
(Note 2)
Min.
Typ.
Max.
Units
Adjustable Version
Reference Voltage
1.20
1.235
1.27
V
I
O
100 mA, -40
C
T
J
125
C,
R1=27k, Measured from V
OUT
to Adj. Pin
1.180
1.235
1.290
V
Output Voltage Range
2
24
V
Line Regulation
6V
V
IN
25V
.02
1.5
mV/V
Load Regulation
5mA
I
O
100 mA
5mA
10
200 mA
5mA
10
350 mA
5mA
10
500 mA
0.3
0.5
1.0
1.0
0.5
1
1.5
2.0
%
%
%
%
Dropout Voltage
I
O
= 100 mA
I
O
= 200 mA
I
O
= 350 mA
I
O
= 500 mA
0.05
0.3
0.5
0.6
0.40
0.50
0.60
0.80
V
V
V
V
Quiescent Current
I
O
= 0 mA,
I
O
= 100 mA
I
O
= 200 mA
I
O
= 350 mA
0.18
2.0
5.0
12
0.5
4
10
mA
mA
mA
mA
Output Noise Voltage
10Hz-100kHz
100
V
rms
/V
Output Bypass Capacitor
ESR=0.1 to 10
10
F
Long Term Stability
T =1000hr
0.4
%/1000hr
Ripple Rejection
f
O
= 120Hz
0.02
dB
Maximum Operational Input
Voltage
21
22
V
Maximum Line Transient
I
O
= 10mA, Reference Voltage
1.5V
T = 1ms,
100ms
35
40
V
On/Off Threshold Voltage
On
Off
V
O
= 3V
2.5
1.8
2.0
1.5
V
V
On/Off Threshold Current
V
OFF
= 2.4V
35
60
A
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. For guaranteed performance limits and associated test conditions, see
the Electrical Characteristics tables.
Note 2: To ensure constant junction temperature, low duty cycle pulse testing is used.
Note 3: Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for T
A
= T
J
= 25
C.
Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature T
J
(MAX), the junction-to ambient thermal resistance
J-A
and the
ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
A
-
J
A
J
T
-
(MAX)
T
P(MAX)
=
Where the value of the junction-to-ambient thermal resistance are as follows: 195
C/W for TO-92 (N), 110
C/W for SOT-89 (L) and 220
C/W for 5 lead SOT-23.
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS500
TYPICAL PERFORMANCE CHARACTERISTICS
6.0
Low Voltage Behavior
2.0
3.0
4.0
5.0
INPUT VOLTAGE (V)
AMS500-3.3
2.0
3.0
4.0
5.0
6.0
0
I
O
= 500mA
0
40
80
0
0.6
0.4
0.2
Dropout Voltage
120
JUNCTION TEMPERATURE ( C)
INPUT OUTPUT DIFFERENTIAL (V)
0.1
0.5
0.3
I
O
= 100mA
0
300
0
0.6
0.4
0.2
Dropout Voltage
600
OUTPUT CURRENT (mA)
INPUT OUTPUT DIFFERENTIAL (V)
0.1
0.5
0.3
OUTPUT VOLTAGE (V)
I
O
= 150mA
I
O
= 200mA
400
500
200
100
I
O
= 350mA
-1
1
3
6
-20 -10
0
10
20
30
40
50
60
INPUT VOLTAGE (V)
Output at Voltage Extremes
OUTPUT VOLTAGE (V)
0
2
5
4
AMS500-5.0
R
L
=500m
-1
1
3
6
-20 -10
0
10
20
30
40
50
60
INPUT VOLTAGE (V)
Output at Voltage Extremes
OUTPUT VOLTAGE (V)
0
2
5
4
AMS500-3.3
R
L
=500m
6.0
Low Voltage Behavior
2.0
3.0
4.0
5.0
INPUT VOLTAGE (V)
AMS500-5.0
2.0
3.0
4.0
5.0
6.0
0
I
O
= 500mA
OUTPUT VOLTAGE (V)
0
10
20
0
1200
800
400
Peak Output Current
30
INPUT VOLTAGE (V)
OUTPUT CURRENT (
m
A)
200
1000
600
T
J
= 25C
45
55
70
60
85
1
10
100
1k
10k 100k
1M
FREQUENCY (Hz)
Ripple Rejection
RIPPLE REJECTION (dB)
50
65
80
75
C2 = 100
F
ALUM
I
O
= 10mA
C2 = 22
F
TANTALUM
1.20
1.30
Reference Voltage
1.12
1.14
1.16
1.18
1.22
1.24
1.26
1.28
OUTPUT VOLTAGE (V)
REFERENCE VOLTAGE (V)
3
6
9
12 15
18
21
24
0
1.10
AMS500 ADJUSTABLE
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS500
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
APPLICATION NOTES
Definition of Terms
Dropout Voltage
: The input-output voltage differential at which
the circuit stops to regulate against further reduction in input
voltage. Measured when the output voltage has dropped 100mV
from the nominal voltage obtained at 1V input, dropout voltage is
dependent upon load current and junction temperature.
Input Voltage
: The DC voltage applied to the input terminal
with respect to ground.
Input-Output Differential
: The voltage
difference between the unregulated input voltage and the
regulated output voltage for which the regulator will regulate.
Line Regulation
: The change in output voltage for a change in
the input voltage. The line regulation is measured under
conditions of low dissipation or by using low duty cycle pulse
testing such that the average chip temperature is not significantly
affected.
Load Regulation
: The change in output voltage for a change in
load current at constant chip temperature.
Long term stability
: Output voltage stability under accelerated
life-test conditions after 1000 hours with maximum rated voltage
and junction temperature.
Output Noise Voltage
: The rms AC voltage at the output, with
constant load and no input ripple, measured over a specified
frequency range.
Quiescent Current
: That part of the positive input current that
does not contribute to the positive load current. The regulator
ground lead current.
Ripple Rejection
: The ratio of the peak-to peak input ripple
voltage to the peak-to-peak output ripple voltage at specified
frequency.
Temperature Stability of V
O
: The percentage change in output
voltage for a thermal variation from room temperature to either
temperature extreme.
External capacitor
The AMS500 series require an output capacitor of 10
F or
greater to ensure device stability. Without the capacitor the
device may oscillate
Most type of tantalum or electrolytic capacitor can be used in the
applications. A critical characteristic of the capacitors is an ESR
value of 5
or less and a resonant frequency above 500kHz. The
value of this capacitor can be increased without limits.
For higher loads, the value of the capacitor should be increased,
specialy when the output voltage is set for 2.5V or less. The
AMS500 lowest fixed output voltage value is 2.0V
Typical application circuit (adjustable output)
R
2
ADJ
+
AMS500
ADJUSTABLE
GND
C1
22
F
10
F
OUT
OFF
ON
ON/OFF
R
1
28k
V
OUT
V
IN
100k
Minimum Load
In circuits using the fixed output voltage versions, minimum load
is not required. For circuits using the adjustable device, the value
of R1 and R2 should be chosen such, that a current of
approximately 40
A flows through the network. The reference
voltage (1.235V) is measured between the adjust pin and V
OUT
.
The output voltage can be set by the two resistors R1 and R2
using the following equation:
+
=
R1
R2
R1
V
V
REF
O
The value of R1 is recommended to be between 25k
to 30 k
,
and the value of R2 will set the output voltage.
-40
40
80
120
25
10
QUIESCENT CURRENT (mA)
Quiescent Current
TEMPERATURE ( C)
15
2
0
0
0
100
200
0
8
4
Quiescent Current
300
OUTPUT CURRENT (mA)
QUIESCENT CURRENT (mA)
2
10
6
~
~
~
~
V
IN
= 6V
20
3
1
I
O
= 50mA
I
O
= 0mA
50
150
250
350
I
O
= 100mA
I
O
= 200mA
-2.5
2.5
10
5.0
17.5
0
1
2
4
5
6
7
8
10
INPUT VOLTAGE (V)
Quiescent Current
QUIESCENT CURRENT (
A)
0
7.5
15
12.5
I
O
= 10mA
3
9
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS500
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted.
3L TO-92 PLASTIC PACKAGE (N)
SOT-89 PLASTIC PACKAGE (L)
0.1400.010
(3.5560.127)
0.0600.010
(1.5240.254)
0.0150.002
(0.3810.051)
0.0160.003
(0.4060.076)
0.0500.005
(1.2700.127)
0.0600.005
(1.5240.127)
DIA
0.1800.005
(4.5720.127)
0.1800.005
(4.5720.127)
0.050
(1.270)
MAX
0.500
(12.70)
MIN
UNCONTROLLED
LEAD DIMENSIONS
10
NOM
5 NOM
N (TO-92 ) AMS DRW# 042391
0.90
(2.286)
NOM
0.090-0.102
(2.29-2.60)
0.173-0.181
(4.40-4.60)
0.064-0.072
(1.62-1.83)
0.155-0.167
(3.94-4.25)
0.059
(1.50)
BSC
0.035-0.047
(0.89-1.20)
L (SOT-89 ) AMS DRW# 042392
0.118
(3.00)
BSC
0.014-0.019
(0.36-0.48)
0.017-0.022
(0.44-0.56)
0.084-0.090
(2.13-2.29)
0.055-0.063
(1.40-1.60)
0.014-0.017
(0.35-0.44)
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS500
PACKAGE DIMENSIONS
inches (millimeters) unless otherwise noted (Continued).
5 LEAD SOT-23 PLASTIC PACKAGE (M1)
0.059-0.070
(1.50-1.75)
0.014-0.020
(0.350-0.50)
0.110-0.120
(2.794-3.048)
0.102-0.118
(2.60-3.00)
0.037
(0.95)
TYP
0.075
(1.90)
TYP
0.018-0.024
(0.457-0.610)
10
NOM
0.0035-0.0080
(0.090-0.20)
(SOT-23-5 ) AMS DRW# 051001
0.036-0.051
(0.090-1.30)
0.003
(0.150)
MAX
0.018-0.024
(0.457-0.610)
10
NOM
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