LM385-25/LM385B-25
Micropower Voltage Reference
FEATURES
Operating Current from 20μA to 20mA.
Low Temperature Coefficient.
1% and 2% Initial Tolerance.
Low Dynamic Impedance.
DESCRIPTION
The LM385-25 is a micropower 2-terminal
bandgap voltage reference, which can operate in
a 20μA to 20mA current range, they feature
exceptionally low dynamic impedance and good
temperature stability. On-chip trimming is used to
achieve tight voltage tolerance. Since the
LM385-25 bandgap reference uses only
transistors and resistors, low noise and good
long-term stability result.
Careful design of the LM385-25 has made the
device exceptionally tolerant of capacitive
loading, making it easy to use in almost any
reference application. The wide dynamic
operating range allows for its use with widely
varying supplies with excellent regulation.
The extremely low power drain of the LM385-25
makes it useful for micropower circuitry. This
voltage reference can be used to make portable
meters, regulators, or general-purpose analog
circuitry with battery life approaching shelf life.
Further, the wide operating current allows it to
replace older references with a tighter tolerance.
APPLICATIONS
Portable, Battery-Powered Equipment.
Instrumentation.
Process Control.
Energy Management.
Product Testing.
Automotive.
Precision Audio Components.
TYPICAL APPLICATION CIRCUIT
V
IN
R
S
2.5V
+
-
LM385-25
Precision 2.500V Voltage Reference
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-385CG-02 20100720
1
LM385-25/LM385B-25
ORDERING INFORMATION
LM385X-25XX XX
P ACK ING TYP E
B G: BA G
TB : TUBE (for S OP -8)
TR: TAPE & REE L
P ACK AG E TY PE
S : SO P -8
U: SO T-23
X : SO T-89
Z: TO -92
C: C OM ME RCIAL
P : LEA D FRE E CO MM ERC IAL
G :G REE N P ACK AG E
TO LE RANCE
PIN CON FI GU RATIO N
SO P-8
TOP VIE W
NC
NC
NC
1
2
3
4
8 +
7 NC
6 NC
5 NC
-
SO T-23
TO P V IEW
1: -
2: NC
3: +
1
3
2
Default: 2%
B: 1%
Exam ple : LM3 85-25P STR
2% version , in Lead Fre e SO P -8 Package &
Tap ing & Ree l P acking T ype
LM 385-25GSTR
2% vers ion, in SO P-8 Green P ackage & Taping
& Reel Packing Type
SO T-89
TO P V IEW
1: NC
2: -
3: +
1
2
3
TO -9 2
TO P V IEW
1: NC
2: +
3: -
1
2
3
SOT-23 Marking
Part No.
LM385-25CU
LM385B-25CU
Marking
AIA2
AIB2
Part No.
LM385-25PU
LM385B-25PU
Marking
AIA2P
AIB2P
Part No.
Marking
LM385-25GU AIA2G
LM385B-25GU AIB2G
SOT-89 Marking
Part No.
LM385-25CX
LM385B-25CX
Marking
AI25
AIB25
Part No.
LM385-25PX
LM385B-25PX
Marking
AI25P
AI2BP
Part No.
LM385-25GX
LM385B-25GX
Marking
AI25G
AI2BG
ABSOLUTE MAXIMUM RATINGS
Reverse Current
Forward Current
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10s)
30mA
10mA
-40°C to 85°C
125°C
-65°C to 150°C
260°C
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2
LM385-25/LM385B-25
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, unless otherwise specified.) (Note1)
PARAMETER
TEST CONDITIONS
LM385B-25
LM385-25
SYMBOL
V
R
ΔV
R
ΔV
R
Z
R
I
RMIN
I
R
=100μA,
10Hz≤ f
≤10KHz
I
R
=100μA
I
R
=100μA, T=1000Hrs,
T
A
=25°C
1
13
120
100
20
20
MIN.
2.475
2.450
TYP.
2.500
2.500
MAX.
2.525
2.550
2
20
UNIT
V
mV
mV
Ω
μA
μVrms
ppm/°C
ppm
Reverse Breakdown Voltage I
R
=100μA
Reverse Breakdown Voltage 20μA≤I
R
≤1mA
Change with Current
1mA≤I
R
≤20mA
Reverse Dynamic Impedance I
R
=100μA, f=20Hz
Minimum Operating Current
Wideband Noise (rms)
Average Temperature
Coefficient (Note 2)
Long Term Stability
e
N
αV
R
ΔV
R
/Δt
Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
Note 2: The average temperature coefficient is defined as the maximum deviation of reverse breakdown
voltage at all measured temperatures from T
MIN
to T
MAX
, divided by T
MAX
- T
MIN
. The measured
temperatures are 0°C, 25°C, 50°C and 70°C.
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