2.5 V Precision Reference / Amplifier
Features
Description
A/AS535
•
•
•
•
•
•
Temperature-compensated:
50 ppm/°C
Trimmed 0.5% typical bandgap
reference
High gain Internal amplifier with
100 mA capability
Nominal temperature range
extended to 105° C
Low frequency dynamic output
impedance: < 150 mΩ
Low output noise
Top view
The AS535 is a three terminal adjustable shunt regulator
utilizing an accurate 2.5V bandgap reference. The AS535 is
functionally similar to an AS2431 except that the reference
and amplifier operate off of a seperate supply from the
output, allowing very low output voltges (0.1V Typically)
Because of its robust bipolar technology, the AS535 handles
a wide range of current, and holds off up to 18V so its use
is not limited to low power, low voltage systems. Significant
care has been taken to provide adequate AC bandwidth to
allow the AS535 as an amplifier in control systems and
power electronics. ASTEC also offers a 1.0% version of this
part, the A535.
Pin Configuration
—
SOIC (D)
4L SIP (SIP)
SOT-23-5 (DBV)
VCC
N/C
N/C
ANODE
VOUT
N/C
N/C
ANODE
VREF
N/C
VCC
VOUT
VREF
VREF
ANODE
VCC
VOUT
Ordering Information
Description
Temperature Range
0.5%
Order Codes
1.0%
8-Pin Plastic SOIC
4-Pin Plastic SIP
SOT - 23 - 5
0 to 105° C
0 to 105° C
0 to 105° C
AS535D
AS535SIP
AS535DBV
A535D
A535SIP
A535DBV
© ASTEC Semiconductor
25
A/AS535
Functional Block Diagram
2.5 V Precision Reference / Amplifier
Supply (Vcc)
Output (V
OUT
)
Reference (R)
2.5 V
Absolute Maximum Ratings
Parameter
Anode (A)
Symbol
Rating
Units
Supply Voltage
Output Voltage
Anode-V
OUT
Forward Current
Operating Output Current
Reference Input Current
Continuous Power at 25° C
8L SOIC
4L SIP
SOT-23-5
Junction Temperature
Storage Temperature
Lead Temperature (Soldering 10 sec.)
VCC
V
OUT
I
AO
I
OUT
I
REF
P
D
18
18
1
100
1
V
V
A
mA
mA
750
1000
200
T
J
T
STG
T
L
150
– 65 to 150
300
mW
mW
mW
°C
°C
°C
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of
this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Recommended Conditions
Parameter
Symbol
Rating
Unit
Typical Thermal Resistances
Package
θ
JA
θ
JC
Typical Derating
Output Voltage
Output Current
V
OUT
I
OUT
-0.2 to 18
10
V
mA
SOIC
SIP
SOT-23-5
175° C/W
95° C/W
575° C/W
45° C/W
50° C/W
150° C/W
5.7 mW/°C
10.5 mW/°C
1.7 mW/°C
ASTEC Semiconductor
26
2.5V Precision Reference / Amplifier
Electrical Characteristics
A/AS535
Electrical characteristics are guaranteed over the full junction temperature range (0-105
°C).
Ambient temperature must be derated
based upon power dissipation and package thermal characteristics. Unless otherwise stated, test conditions are: V
OUT
= V
REF
, VCC=5V
and I
OUT
= 1 mA.
A535 (1.0 %)
AS535 (0.5 %)
Parameter
Supply Voltage
Supply Current
Reference Voltage
Line Regulation
Load Regulation
Temperature Deviation
Reference Input Current
Amplifier open loop gain
Amplifier Unity gain frequency
Output Saturation Voltage
Off State Leakage
Symbol
VCC
ICC
V
REF
∆V
OUT
∆V
OUT
∆V
OUT
I
REF
Av
F
1
V
SAT
I
LEAK
Test Condition
Min
4
Typ
Max
15
Min
4
Typ
Max Units
15
V
mA
V
mV
mV
mV
µA
dB
MhZ
0.4
V
nA
0.5
T
J
= 25° C
VCC =4 to 15 V
I
OUT
= 1 to 100 mA
0 < T
J
< 105° C
1
0. 5
1
2.475 2.500 2.525
-1
1
3
0.1
70
80
2
0.4
0.04
500
-10
50
10
0.4
2.488 2.500 2.513
-1
1
3
0.1
70
1
80
2
-10
50
8
0.4
C
LOAD
< 1nF
I
OUT
=100mA
V
REF
= 0 V, V
OUT
= 15 V
1
0.04
500
*Temperature deviation is defined as the maximum deviation of the reference over the given temperature range and does not imply an
incremental deviation at any given temperature.
Typical Performance Curves
*Calculating Average Temperature Coefficient (TC)
ppm
mV
0
0
0
∆V
REF
∆T
• TC in mV/°C =
∆V
REF
∆T
A
%
(mV)
2000
0.2
-5
• TC in %/°C =
-10
0
15
30
45
60
Temperature (°C)
75
90
105
(
∆V
REF
V
REF
at 25° C
∆T
A
)
x 100
0.021 mV/°C
0.008 %/°C
8.0 ppm/°C
• TC in ppm/°C =
(
∆V
REF
V
REF
at 25° C
∆T
A
)
x 10
6
ASTEC Semiconductor
27
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