AMS2931 - Advanced Monolithic Systems

Advanced
Monolithic
Systems
AMS2931
100mA LOW DROPOUT VOLTAGE REGULATOR
RoHS compliant
FEATURES
APPLICATIONS
• Fixed and Ajustable Versions Available
• Output Current in excess of 100mA
• Very Low Quiescent Current
• Reverse Battery Protection
• Input-output Differential less than 0.6V
• Short Circuit protection
• Internal Thermal Overload Protection
• 60V Load Dump Protection
• -50V Reverse Transient Protection
• Mirror Image Insertion Protection
• Battery Powered Systems
• Portable Consumer Equipment
• Cordless Telephones
• Portable (Notebook) Computers
• Portable Instrumentation
• Radio Control Systems
• Automotive Electronics
GENERAL DESCRIPTION
The AMS2931 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 1mA or less when supplying 10mA loads. This unique
characteristic and the extremely low input -output differential required for proper regulation (0.2V for output currents of 10mA)
make the AMS2931 ideal to use for standby power systems.
Originally designed for automotive applications, the AMS2931 and all regulated circuitry are protected from input fault
conditions caused by reverse battery installation or two battery jump starts. During line transients, such as load dump (60V)
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 AMS2931 series also includes internal current
limiting, thermal shutdown, and is able to withstand temporary power-up with mirror-image insertion.
The AMS2931 is offered in the 3-pin TO-92 package, 8-pin plastic SOIC, TO-220 and TO-263 packages.
ORDERING INFORMATION
OUTPUT
PACKAGE TYPE
8 LEAD SOIC
TO-220
AMS2931AS-X
AMS2931AT-X
AMS2931S-X
AMS2931T-X
ADJ.
AMS2931CS
X = 2.0V, 2.5V, 3.0V, 3.3V, 3.5V, 4.0V, 5.0V
*For additional available fixed voltages contact factory
VOLTAGE
FIXED*
TO-92
AMS2931AN-X
AMS2931N-X
www.advanced-monolithic.com
OPER. TEMP
TO-263
AMS2931AM-X
AMS2931M-X
RANGE
-40ºC to +85ºc
-40ºC to +85ºc
-40ºC to +85ºc
updated April 24, 2009
AMS2931
ABSOLUTE MAXIMUM RATINGS (Note 1)
Overvoltage Protection
AMS2931A-X, AMS2931C
AMS2931-X
Maximum Input Voltage
Internal Power Dissipation (Note 4)
Storage Temperature
60V
50V
22V
Internally Limited
-65°C to +150°C
OPERATING CONDITIONS (Note1)
Input voltage range
Junction Temperature
Lead Temperature (Soldering 25 sec)
ESD
4V to 22V
+125°C
265°C
2000V
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =14V, IO =10mA, TJ=25°C, C2 = 100µF unless otherwise specified.
PARAMETER
CONDITIONS
Min.
AMS2931A-X
Typ.
Max.
Min.
AMS2931-X
Typ.
Max.
Units
Fixed Output voltage Versions
Output Voltage
6V ≤VIN ≤26V, IO=100 mA
-1.0
+1.0
- 3.0
+ 3.0
-3.0
+3.0
%
± 5.0
-40°C ≤TJ ≤125°C
%
9V ≤VIN ≤ 16V
2
10
2
10
mV
6V ≤VIN ≤ 26V
4
30
4
30
mV
Load Regulation
5mA ≤IO ≤ 100 mA
14
50
14
50
mV
Dropout Voltage
IO = 10 mA
50
200
50
200
mV
IO = 100 mA
300
600
300
600
mV
IO ≤ 10 mA, 6V ≤ VIN ≤ 26V
0.4
1.0
0.4
1.0
mA
15
30
15
Line Regulation
Quiescent Current
-40°C ≤TJ ≤ 125°C
IO = 100 mA, VIN = 14V, TJ = 25°C
5
500
mA
500
Output Noise Voltage
10Hz-100kHz, COUT = 100µA
Output Impedance
100mADC and 10mArms,100Hz=10kHz
Long Term Stability
T =1000hr
Ripple Rejection
fO =120Hz
55
80
Maximum Line Transient
RL = 500Ω, VO ≤ 5.5V
60
70
50
-15
-30
-50
-80
200
µV rms
200
20
mΩ
20
mV
80
dB
70
V
-15
-30
V
-50
-80
V
T = 1ms, τ ≤100ms
Reverse Polarity Input Voltage,
D/C
Reverse Polarity Input Voltage,
Transient
RL = 500Ω, T = 1ms, τ ≤100ms
www.advanced-monolithic.com
updated April 24, 2009
AMS2931
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at VIN =14V, VOUT =3V IO =10mA, TJ=25°C, R1 =27k, C2 = 100µF unless otherwise specified.
PARAMETER
Min.
AMS2931C
Typ.
Max.
1.14
1.20
1.26
V
1.32
V
CONDITIONS
(Note 2)
Units
Adjustable Version
Reference Voltage
IO ≤ 100 mA, -40°C ≤TJ ≤ 125°C, R1=27k,
Measured from VOUT to Adjust Pin
Output Voltage Range
1.08
3
24
V
Line Regulation
VOUT + 0.6V ≤VIN ≤ 26V
.02
1.5
Load Regulation
5mA ≤IO ≤ 100 mA
0.3
1
%
Dropout Voltage
IO ≤ 10 mA
0.05
0.3
0.2
0.6
V
V
1
During Shutdown RL = 500Ω
0.4
15
0.8
Output Noise Voltage
10Hz-100kHz
100
µVrms/V
Output Impedance
100mADC and 10mArms,100Hz=10kHz
40
mΩ
%/1000hr
IO = 100 mA
Quiescent Current
IO = 10 mA
IO = 100 mA
Long Term Stability
T =1000hr
0.4
Ripple Rejection
fO = 120Hz
0.02
Maximum Operating Input
Voltage
Maximum Line Transient
21
IO = 10mA, Reference Voltage ≤ 1.5V
1
mV/V
mA
mA
mA
%/V
22
V
60
70
V
T = 1ms, τ ≤100ms
Reverse Polarity Input Voltage,
D/C
RL = 500Ω, VO ≥ -0.3V
-15
-30
V
Reverse Polarity Input Voltage,
Transient
RL = 500Ω, T = 1ms, τ ≤100ms
-50
-80
V
On/Off Threshold Voltage
VO = 3V
On
Off
On/Off Threshold Current
2.0
3.25
1.2
2.2
20
V
V
50
µA
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: See Circuit in Typical Applications. 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
TA = TJ = 25°C.
Note 4: The junction-to-ambient thermal resistance are as follows: 195°C/W for the TO-92 (N) package, 160°C/W for the molded plastic SO-8 (S), 50°C/W
for the TO-220 package and 73°C/W for the TO-263 package. If the TO-220 package is used with a heat sink, θJA is the sum of the package thermal resistance
junction-to-case of 3°C/W and the thermal resistance added by the heat sink and the thermal interface. The thermal resistance of the TO-263 package can be
reduced by increasing the PCB copper area thermally connected to the package: using 0.5 square inches of copper area, ϕ JA is 50°C/W; with 1 square inch of
copper area ϕ JA is 37°C/W; and with 1.6 or more square inches of copper area ϕ JA is 32°C/W.
www.advanced-monolithic.com
updated April 24, 2009
AMS2931
PIN CONNECTIONS
FIXED OUTPUT VOLTAGE
OUTPUT
8L SOIC
SO-Package (S)
INPUT
OUTPUT 1
7 GROUND
GROUND 3
6 GROUND
N/C 4
Bottom View
TO-263 (M)
TAB IS
GND
OUTPUT
GND
INPUT
8 INPUT
GROUND 2
GND
TO-220 (T)
GND
TO-92
Plastic Package (N)
OUTPUT
GND
INPUT
5 N/C
Top View
Front View
Top View
ADJUSTABLE OUTPUT VOLTAGE
8L SOIC
SO-Package (S)
OUTPUT 1
8 INPUT
GROUND 2
7 GROUND
GROUND 3
6 GROUND
ADJ 4
5 ON/OFF
Top View
TYPICAL APPLICATIONS
AMS2931-X (Fixed Output)
AMS2931C (Adjustable Output)
VCC
VIN
UNREGULATED
INPUT
C1*
0.1µF
AMS2931
GND
IQ
VOUT
REGULATED
OUTPUT
R3
51k
C2**
100µF
OUT
ON/OFF
C1*
0.1µF
AMS2931
ADJUSTABLE
R1
28k
+
ADJ
ON
*Required if regulator is located far from power supply filter.
**C2 must be at least 100µF to maintain stability; it can be increased
without bound to maintain regulation during transients and it should be
located as close as possible to the regulator. This capacitor must be rated
over the same operating temperature range like the regulator. The ESR
of this capacitor is critical (see curve).
VOUT
OFF
GND
C2**
100µF
R2
VOUT = VREF × ( R1+R2)/R1
Note: Using 27k for R1 will automatically compensate for errors in VOUT
due to the input bias current of the Adjust Pin ( approx. 1µA)
www.advanced-monolithic.com
updated April 24, 2009
AMS2931
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
IO = 100mA
0.3
IO = 50mA
0.2
IO = 10mA
0.1
0
0
0.5
5.0
0.4
0.3
0.2
0.1
6
4
2
0
0 10 20 30 40 50
INPUT VOLTAGE (V)
60
INPUT VOLTAGE OUTPUT VOLTAGE
CHANGE (V)
DEVIATION (mV)
3
2
1
0
-1
-2
~
-3 ~
VIN = VOUT = 9V
C2= 100 µF
~
~
3
0
0
Peak Output Current
15
30
TIME (µs)
2.0
45
QUIESCENT CURRENT (mA)
TJ= 25°C
400
TJ = 85°C
300
TJ = -40°C
200
100
0
C2= 100µF
0
-40
~
~
20
10
INPUT VOLTAGE (V)
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30
~
~
150
0
0
15
30
TIME (µs)
45
25
VIN = 14V
25
20
15
10
5
0
0
40
Quiescent Current
30
500
3.0
4.0
5.0
6.0
INPUT VOLTAGE (V)
Load Transient Response
Quiescent Current
600
OUTPUT CURRENT ( mA)
100
0
60
30
90
OUTPUT CURRENT (mA)
QUIESCENT CURRENT (mA)
OUTPUT VOLTAGE (V)
8
-2
-20 -10
50
OUTPUT CURRENT (mA)
Line Transient Response
AMS2931-5.0
RL=500Ω
10
2.0
0
0
Output at Voltage Extremes
12
3.0
0
80
40
120
JUNCTION TEMPERATURE (° C)
AMS2931-5.0
IO = 100mA
4.0
OUTPUT VOLTAGE
DEVIATION (mV)
0.4
6.0
OUTPUT VOLTAGE (V)
0.5
Low Voltage Behavior
0.6
LOAD CURRENT(mA)
INPUT OUTPUT DIFFERENTIAL (V)
INPUT OUTPUT DIFFERENTIAL (V)
Dropout Voltage
0.6
20
15
10
3
~
~
~
~
IO = 50mA
2
1
IO = 0mA
0
-40
0
40
80
120
TEMPERATURE (° C)
updated April 24, 2009
AMS2931
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Quiescent Current
Ripple Rejection
IO= 100mA
15
10
IO= 50mA
5
C2 = 100µF
TANTALUM
80
25
20
85
0
75
C2 = 100µF
ALUM
70
65
60
55
AMS2931-5.0
IO= 10mA
50
75
70
65
60
55
FQ= 120Hz
50
IO= 10mA
45
60
1
Output Impedance
OUTPUT
VOLTAGE (V)
1
0.1
10
100
1k 10k 100k
FREQUENCY (Hz)
1M
0
~
~
0.7
0.6
0.5
0.4
0.3
0.2
~
~
CO= 100µF
RL= 500Ω
0
100 200 300
TIME (ms)
400
0 10 20 30 40 50 60 70 80 90
AMBIENT TEMPERATURE (° C)
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
0
NO HEAT SINK
3
6 9 12 15 18 21
OUTPUT VOLTAGE (V)
0.8
0.7
0.125" Lead Lenght
from PC Board
0.6
0.5
0.4
0.4" Lead
Lenght from
PC Board
0.3
0.2
0.1
0
0 10 20 30 40 50 60 70 80 90 100
AMBIENT TEMPERATURE (° C)
24
Maximum Power Dissipation (TO-92)
1.0
0.9
INFINITE HEAT SINK
2
0
0.1
0
1.26
500
10° C/W HEAT SINK
AMS2931C ADJUSTABLE
1.28
Maximum Power Dissipation (TO-220)
POWER DISSIPATION (W)
0.8
100
Reference Voltage
τ =150ms
6
4
2
0
-2
-100
22
20
18
16
14
12
10
8
6
4
25
50
75
OUTPUT CURRENT (mA)
1.30
70
60
50
40
30
20
10
0
Maximum Power Dissipation (SO-8)
1.0
0.9
www.advanced-monolithic.com
45
1M
REFERENCE VOLTAGE (V)
INPUT
VOLTAGE (V)
IO = 10mA
1
100 1k 10k 100k
FREQUENCY (Hz)
Operation During Load Dump
AMS2931-5.0
0.01
10
POWER DISSIPATION (W)
0 10 20 30 40 50
INPUT VOLTAGE (V)
10
OUTPUT IMPEDANCE (Ω)
5V OUTPUT
80
RIPPLE REJECTION (dB)
5V OUTPUT
30
-5
-20 -10
POWER DISSIPATION (W)
Ripple Rejection
85
RIPPLE REJECTION (dB)
QUIESCENT CURRENT ( mA)
35
0 10 20 30 40 50 60 70 80
AMBIENT TEMPERATURE (° C)
updated April 24, 2009
AMS2931
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
3
θJA = 37° C/W
2
θJA = 50° C/W
1
θJA = 73° C/W
0
0 10 20 30 40 50 60 70 80 90 100
AMBIENT TEMPERATURE (° C)
4.0
3.8
AMS2931C ADJUSTABLE
3.6
3.4
OFF
3.2
3.0
2.8
2.6
ON
2.4
2.2
2.0
0
3
6
9 12 15 18 21
OUTPUT VOLTAGE (V)
24
EQUIVALENT SERIES RESISTANCE (Ω)
4
θJA = 32° C/W
Output Capacitor ESR
On/Off Treshold
ON/OFF VOLTAGE TRESHOLDS (V)
POWER DISSIPATION (W)
Maximum Power Dissipation (TO-263)
100
COUT= 100µF
VO = 5V
10
1
STABLE
REGION
0.1
0.01
0
20
40
60
80
OUTPUT CURRENT (mA)
100
APPLICATION HINTS
The AMS2931 series require an output capacitor for device
stability. The value required depends on the application circuit and
other factors.
Because high frequency characteristics of electrolytic capacitors
depend greatly on the type and even the manufacturer, the value of
capacitance that works well with AMS2931 for one brand or type
may not necessary be sufficient with an electrolytic of different
origin. Sometimes actual bench testing will be the only means to
determine the proper capacitor type and value. To obtain stability
in all general applications a high quality 100µF aluminum
electrolytic or a 47µF tantalum electrolytic can be used.
A critical characteristic of the electrolytic capacitors is their
performance over temperature. The AMS2931 is designed to
operate to -40°C, but some electrolytics will freeze around -30°C
therefore becoming ineffective. In such case the result is
oscillation at the regulator output. For all application circuits
where cold operation is necessary, the output capacitor must be
rated to operate at the minimum temperature. In applications
where the regulator junction temperature will never be lower than
25°C the output capacitor value can be reduced by a factor of two
over the value required for the entire temperature range (47µF for
a high quality aluminum or 22µF for a tantalum electrolytic
capacitor).
www.advanced-monolithic.com
With higher output currents, the stability of AMS2931 decreases.
Considering the fact that in many applications the AMS2931 is
operated at only a few milliamps (or less) of output current, the
output capacitor value can be reduced even further. For example, a
circuit that is required to deliver a maximum of 10mA of output
current from the regulator output will need an output capacitor of
only half the value compared to the same regulator required to
deliver the full output current of 100mA.
In the case of AMS2931C (adjustable), the minimum value of
output capacitance is a function of the output voltage. As a general
rule, with higher output voltages the value of the output
capacitance decreases, since the internal loop gain is reduced.
In order to determine the minimum value of the output capacitor,
for an application circuit, the entire circuit including the capacitor
should be bench tested at minimum operating temperatures and
maximum operating currents. To maintain internal power
dissipation and die heating to a minimum, the input voltage should
be maintain at 0.6V above the output. Worst-case occurs just after
input power is applied and before the die had the chance to heat
up. After the minimum capacitance value has been found for the
specific brand and type of electrolytic capacitor, the value should
be doubled for actual use to cover for production variations both
in the regulator and the capacitor.
updated April 24, 2009
AMS2931
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
3 LEAD TO-92 PLASTIC PACKAGE (N)
0.180±0.005
(4.572±0.127)
0.060±0.005
(1.524±0.127)
DIA
0.060±0.010
(1.524±0.254)
0.90
(2.286)
NOM
0.180±0.005
(4.572±0.127)
0.140±0.010
(3.556±0.127)
5° NOM
0.500
(12.70)
MIN
0.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSIONS
0.015±0.002
(0.381±0.051)
0.016±0.003
(0.406±0.076)
0.050±0.005
(1.270±0.127)
10°
NOM
N (TO-92 ) AMS DRW# 042391
8 LEAD SOIC PLASTIC PACKAGE (S)
0.189-0.197*
(4.801-5.004)
8
7
6
5
0.228-0.244
(5.791-6.197)
0.150-0.157**
(3.810-3.988)
1
2
3
4
0.010-0.020 x 45°
(0.254-0.508)
0.053-0.069
(1.346-1.752)
0.004-0.010
(0.101-0.254)
0.014-0.019
(0.355-0.483)
0.008-0.010
(0.203-0.254)
0.050
(1.270)
TYP
0°-8° TYP
0.016-0.050
(0.406-1.270)
S (SO-8 ) AMS DRW# 042293
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
www.advanced-monolithic.com
updated April 24, 2009
AMS2931
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued).
3 LEAD TO-220 PLASTIC PACKAGE (T)
0.147-0.155
(3.734-3.937)
DIA
0.390-0.415
(9.906-10.541)
0.165-0.180
(4.191-4.572)
0.045-0.055
(1.143-1.397)
0.230-0.270
(5.842-6.858)
0.570-0.620
(14.478-15.748)
0.460-0.500
(11.684-12.700)
0.330-0.370
(8.382-9.398)
0.980-1.070
(24.892-27.178)
0.218-0.252
(5.537-6.401)
0.520-0.570
(13.208-14.478)
0.090-0.110
(2.286-2.794)
0.050
(1.270)
TYP
0.028-0.038
(0.711-0.965)
0.013-0.023
(0.330-0.584)
0.095-0.115
(2.413-2.921)
T (TO-220) AMS DRW# 042193
3 LEAD TO-263 PLASTIC DD (M)
0.060
(1.524)
TYP
0.390-0.415
(9.906-10.541)
0.165-0.180
(4.191-4.572)
0.004 +0.008
-0.004
(0.102 +0.203 )
-0.102
0.330-0.370
(8.382-9.398)
0.199-0.218
(5.05-5.54)
0.090-0.110
(2.286-2.794)
www.advanced-monolithic.com
0.032
(0.81)
TYP
0.045-0.055
(1.143-1.397)
0.108
(2.74)
TYP
0.013-0.023
(0.330-0.584)
0.095-0.115
(2.413-2.921)
0.90-0.110
(2.29-2.79)
M (DD3) AMS DRW# 042191R1
updated April 24, 2009