Analog Microelectronics, Inc.
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AME385-1.2
Micropower Voltage Reference Diode
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General Description
The AME385-1.2 is a micropower 2-terminal band-gap
voltage regulator diode. It operates over a 15
A to 20mA
current range. Each circuit is trimmed at wafer sort to
provide a
0.2% and
0.5% initial tolerance. The de-
sign of the AME385-1.2 allows for a large range of load
capacitances and operating currents. The low start-up
current makes these part ideal for battery applications.
Analog Microelectronics offers this part in a TO-92 and
SO-8 packages as well as the space saving SOT-23.
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Key Features
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Small packages: SOT-23, TO-92, SO-8
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Tolerates capacitive loads
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Fixed reverse breakdown voltage of 1.235V
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Tight voltage tolerance ----------
0.20%,
0.5%
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Wide operating current ---------- 15
A to 20mA
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Wide temperature range -------- -40
o
C to +85
o
C
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Low temperature coefficient --- 100ppm/
o
C (max)
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Excellent transient response
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Typical Application
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Applications
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Portable electronics
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Power supplies
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Computer peripherals
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Data acquisition systems
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Battery chargers
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Consumer electronics
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Functional Block Diagram
G ND
V R
B andgap
Cell
Feedbac k
Current
S hunt
V S
1000pF
V alue optional
I
RS =
V R = 1.235V
V R
V S - V R
RS
I
Analog Microelectronics, Inc.
2
Micropower Voltage Reference Diode
AME385-1.2
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Ordering Information
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Package Outline
* The NC pin must float or be connected to - (nega-
tive)
+
-
+
-
N C
*
N C
*
+
-
SOT-23 Top View
TO-92-3 Bottom View
TO-92-2 Bottom View
N C
+
-
N C
N C
N C
N C
N C
1
2
3
4
5
6
7
8
SO-8 Top View
Part N umber
Accuracy
Marking
Package Operating Temp. R ange
A M E385CE ET
0.2%
A CQww
S OT-23
-40
O
C to +85
O
C
A M E385CE HA
0.2%
A M E
385CEHA
y y ww
S O-8
-40
O
C to +85
O
C
A M E385A E AS
0.5%
A M E
385
A EA S
y y ww
TO-92-2
-40
O
C to +85
O
C
A M E385A E AT
0.5%
A M E
385
A EA T
y y ww
TO-92-3
-40
O
C to +85
O
C
A M E385A E ET
0.5%
A BXww
S OT-23
-40
O
C to +85
O
C
A M E385A E HA
0.5%
A M E
385A EHA
y y ww
S O-8
-40
O
C to +85
O
C
Pleas e consult AME sales offic e or authorized Rep./Distributor for other voltage ac curacy and
package type availability.
Analog Microelectronics, Inc.
3
AME385-1.2
Micropower Voltage Reference Diode
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Absolute Maximum Ratings
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Recommended Operating Conditions
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Thermal Information
Caution: Stress above the listed absolute rating may cause permanent damage to the device
Pa ra m e te r
Ma x im um
Unit
Supply Current
50
mA
Para meter
Rating
Unit
Supply Current
100
A ~ 20mA
Ambient Temperature Range
-40 to +85
o
C
Junction Temperature
-40 to +125
o
C
M a x i m u m
U n i t
S O T-2 3
3 2 5
TO -9 2
1 8 0
S O -8
1 2 5
M ax im u m Jun c t io n Te m p era t u re
1 5 0
o
C
M ax im u m L e a d Te m p e ra tu re ( 1 0 S e c )
3 0 0
o
C
P a ra m e te r
o
C / W
Th e rm a l R e s is t a n c e
Analog Microelectronics, Inc.
4
Micropower Voltage Reference Diode
AME385-1.2
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Electrical Specifications
Unless otherwise specified, TA
=
0 ~70
o
C, I
R
=
100
A
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage,
0.2%
1.232
1.235
1.238
V
Reference Voltage,
0.5%
1.229
1.235
1.241
V
Minimum Current
I
MIN
15
A
I
MIN
< I < 1mA
1.5
3
1mA < I < 20mA
5
20
Maximum Operation Current
IL
max
20
mA
Reverse Dynamic Impedence
RDI
I
R
= 100
A, f=20Hz
1.5
Ohm
Wideband Noise (rms)
Vn
I
R
= 100
A, 10 Hz<f<10KHz
60
V
Long term Stability
I
R
= 100
A, T
A
=25
O
C,
T=1000 Hours
20
ppm
Reference Voltage Temp. Coeff.
V
REFTC
0
o
C < T
A
< 70
o
C
100
ppm/
o
C
Reference Voltage Change With
Current
dV
REF/I
mV
V
REF
I
REF
=
100
A
Analog Microelectronics, Inc.
5
AME385-1.2
Micropower Voltage Reference Diode
VR
V
IN
5V/DIV
0.5V/DIV
25
o
C
(mA)
(mV)
0.0
1
100
-1
0
1
2
Forward Characteristic
85
o
C
25
o
C
1
A
100
A
10mA
0.125V/DIV
0.0V
1.0V
Output Voltage Change vs. Current
Reverse Characteristic
25
o
C
85
o
C
0.0V
0.65V
1.3V
V
R
100
A
10
A
1
A
100nA
I
R
Transient Response
200
S/DIV
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
-50
0
50
100
150
Normalized Percentage Change vs.
Temperature
% Change of V
OUT
(
O
C)
I = 100
A
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