Advanced Monolithic Systems AMS2931 Service Manual

http://www.BDTIC.com/AMS

Advanced AMS2931
Monolithic 100mA LOW DROPOUT VOLTAGE REGULATOR
Systems

RoHS compliant

FEATURES APPLICATIONS

•••• Fixed and Ajustable Versions Available •••• Battery Powered Systems

•••• Output Current in excess of 100mA •••• Portable Consumer Equipment

•••• Very Low Quiescent Current •••• Cordless Telephones

•••• Reverse Battery Protection •••• Portable (Notebook) Computers

•••• Input-output Differential less than 0.6V •••• Portable Instrumentation

•••• Short Circuit protection •••• Radio Control Systems

•••• Internal Thermal Overload Protection •••• Automotive Electronics

•••• 60V Load Dump Protection

•••• -50V Reverse Transient Protection

•••• Mirror Image Insertion Protection

GENERAL DESCRIPTION

AMS2931 series consists of positive fixed and adjustable voltage regulators ideally suited for use in battery-powered

The
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

PUT PACKAGE TYPE OPER. TEMP

OUT

VOLTAGE

FIXED* AMS2931AN-X AMS2931AS-X AMS2931AT-X AMS2931AM-X -40ºC to +85ºc

AMS2931N-X AMS2931S-X AMS2931T-X AMS2931M-X -40ºC to +85ºc

ADJ. AMS2931CS -40ºC to +85ºc
X = 2.0V, 2.5V, 3.0V, 3.3V, 3.5V, 4.0V, 5.0V
*For additional available fixed voltages contact factory

TO-92 8 LEAD SOIC TO-220 TO-263

RANGE

updated April 24, 2009

http://www.BDTIC.com/AMS

AMS2931

ABSOLUTE MAXIMUM RATINGS (Note 1)

Overvoltage Protection

OPERATING CONDITIONS (Note1)

AMS2931A-X, AMS2931C 60V Input voltage range 4V to 22V
AMS2931-X 50V Junction Temperature

+125°C

Maximum Input Voltage 22V Lead Temperature (Soldering 25 sec)
Internal Power Dissipation (Note 4) Internally Limited ESD 2000V
Storage Temperature

-65°C to +150°C

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at V

PARAMETER

Fixed Output voltage Versions

Output Voltage -1.0 +1.0 -3.0 +3.0 %

Line Regulation

Load Regulation

Dropout Voltage

Quiescent Current

Output Noise Voltage

Output Impedance 100mADC and 10mA

Long Term Stability T =1000hr 20 20 mV

Ripple Rejection fO =120Hz

Maximum Line Transient

Reverse Polarity Input Voltage,
D/C

Reverse Polarity Input Voltage,
Transient

=14V, IO =10mA, TJ=25°C, C2 = 100µF unless otherwise specified.

N

I

CONDITIONS

6V ≤VIN ≤26V, IO=100 mA

-40°C ≤T

9V ≤VIN ≤ 16V

6V ≤VIN ≤ 26V

5mA ≤I

I

O

I

O

I

O

-40°C ≤T

I

O

10Hz-100kHz, C

RL = 500Ω, VO ≤ 5.5V

T = 1ms, τ ≤100ms

RL = 500Ω, T = 1ms, τ ≤100ms

≤125°C

J

≤ 100 mA

O

= 10 mA

= 100 mA

≤ 10 mA, 6V ≤ VIN ≤ 26V

≤ 125°C

J

= 100 mA, V

= 14V, TJ = 25°C

IN

= 100µA

OUT

,100Hz=10kHz 200 200

rms

AMS2931A-X

Min. Typ. Max.

- 3.0

14 50 14 50 mV

5

500 500

55

60 70 50 70 V

-15 -30 -15 -30 V

-50 -80 -50 -80 V

2

4

50

300

0.4

15

80 80 dB

+ 3.0

10

30

200

600

1.0

30

AMS2931-X

Min. Typ. Max.

2

0.4

±±±± 5.0

4

50

300

15

%

10

30

200

600

1.0

265°C

Units

mV

mV

mV

mV

mA

mA

µV rms

mΩ

updated April 24, 2009

http://www.BDTIC.com/AMS

AMS2931

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at V

PARAMETER

Adjustable Version

Reference Voltage

Output Voltage Range 3 24 V

Line Regulation

Load Regulation

Dropout Voltage

Quiescent Current

Output Noise Voltage 10Hz-100kHz 100

Output Impedance 100mADC and 10mA

Long Term Stability T =1000hr 0.4 %/1000hr

Ripple Rejection fO = 120Hz 0.02 %/V

Maximum Operating Input
Voltage

Maximum Line Transient

Reverse Polarity Input Voltage,
D/C

Reverse Polarity Input Voltage,
Transient

On/Off Threshold Voltage

On

Off

On/Off Threshold Current 20 50

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.

=14V, V

IN

1.14 1.20 1.26 V
IO ≤ 100 mA, -40°C ≤T

Measured from V

V

+ 0.6V ≤VIN ≤ 26V

OUT

5mA ≤IO ≤ 100 mA

I

≤ 10 mA

O

I

= 100 mA

O

I

= 10 mA

O

I

= 100 mA

O

During Shutdown RL = 500Ω

21 22

IO = 10mA, Reference Voltage ≤ 1.5V

T = 1ms, τ ≤100ms

RL = 500Ω, VO ≥ -0.3V

RL = 500Ω, T = 1ms, τ ≤100ms

VO = 3V

=3V IO =10mA, TJ=25°C, R1 =27k, C2 = 100µF unless otherwise specified.

OUT

CONDITIONS

(Note 2)

≤ 125°C, R1=27k,

J

to Adjust Pin

OUT

,100Hz=10kHz 40

rms

Min.

1.08 1.32

.02 1.5 mV/V

0.3 1 %

60 70 V

-15 -30 V

-50 -80 V

3.25

AMS2931C

Typ.

0.05

0.3

0.4

15

0.8

2.0

2.2

Max.

0.2

0.6

1.2

1

1

Units

V

V

V

mA

mA

mA

µV

rms

mΩ

V

V

V

µA

/V

updated April 24, 2009