Datasheet

UNISONIC TECHNOLOGIES CO., LTD
M385
Preliminary
LINEAR INTEGRATED CIRCUIT
MICROPOWER VOLTAGE
REFERENCE

DESCRIPTION
The UTC M385 is a micropower voltage reference. This device
features good temperature stability and extreme low dynamic
impedance when it is operated over a 20μA to 20mA current. Low
noise and good long-term stability are achieved because the UTC
M385 bandgap reference applies only bipolar transistors and
resistors.
The UTC M385 can be used in almost any reference application
due to the exceptional tolerance of capacitive loading. This voltage
reference can be applied in portable meters, regulators, or
general-purpose analog circuitry with battery life approaching shelf
life. The wide dynamic operating range contributes to its use with
widely varying supplies with excellent regulation. The low power
drain of the UTC M385 is useful for micropower circuitry. On-chip
trimming gives it the tight voltage tolerance. Furthermore, the wide
operating current can replace older references with a tighter
tolerance.
The UTC M385 can be used in such applications, for example,
portable and battery-powered equipment, instrumentation, process
control, energy management, product testing, automotive, precision
audio components, and so on.

FEATURES
* Initial tolerance: 1%
* Operating current range: 10μA~20mA for VR=1.235V
20μA~20mA for VR=2.5V
* Low temperature coefficient
* Low voltage reference

ORDERING INFORMATION
Ordering Number
Note:
Package
M385G-xx-AE3-R
SOT-23
M385G-xx-AE3-A-R
SOT-23
M385G-xx-S08-R
SOP-8
xx: Output Voltage, refer to Marking Information.
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Copyright © 2015 Unisonic Technologies Co., Ltd
Pin Assignment
1
2
3
K
A
NC
A
K
NC
refer to PIN CONNECTIONS
Packing
Tape Reel
Tape Reel
Tape Reel
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M385

Preliminary
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
SOT-23
12: 1.2V
25: 2.5V
SOP-8

PIN CONNECTIONS
NC 1
8 +
NC 2
7 NC
NC 3
6
-
NC
5 NC
4
SOP-8

PIN DESCRIPTIONS
PIN NO.
1
2
3
4
5
6
7
PIN NAME
NC
NC
NC
NC
NC
NC
8
+
PIN FUNCTION
Not connected
Not connected
Not connected
Pin-sources current for normal application, the current value is the same as Pin+
Not connected
Not connected
Not connected
Sinks current with a range from 20μA to 20mA for normal applications, a stable positive
voltage, relative to Pin-, occurs on Pin-
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M385

Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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M385

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Reverse Current
IR
30
mA
Forward Current
IF
10
mA
Junction Temperature
TJ
125
°C
Operating Temperature
TOPR
-40 ~ +85
°C
Storage Temperature
TSTG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified.)
M385-1.2V
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Charge with Current
Reverse Dynamic Impedance
Minimum Operating Current
Wideband Noise
Average Temperature Coefficient
Long Term Stability
SYMBOL
VR
∆VR
ZR
IR(MIN)
eN
αVR
∆VR
∆t
CONDITIONS
IR=100μA
10μA<IR<1mA
1mA <IR<20mA
IR =100μA, f=20Hz
IR =100μA,10Hz≤f≤10KHz
IR =100μA
IR =100μA, T=1000Hrs, TA=25°C
MIN TYP MAX UNIT
1.222 1.235 1.248
V
2
mV
20
mV
1
Ω
8
15
μA
60
μVrms
100
ppm/°C
20
ppm
M385-2.5V
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Charge with Current
Reverse Dynamic Impedance
Minimum Operating Current
Wideband Noise
Average Temperature Coefficient
Long Term Stability
SYMBOL
VR
∆VR
ZR
IR(MIN)
eN
αVR
∆VR
∆t
CONDITIONS
IR=100μA
20μA<IR<1mA
1mA <IR<20mA
IR =100μA, f=20Hz
IR =100μA,10Hz≤f≤10KHz
IR =100μA
IR =100μA, T=1000Hrs, TA=25°C
UNISONIC TECHNOLOGIES CO., LTD
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MIN TYP MAX UNIT
2.475 2.5 2.525
V
3.2
mV
20
mV
1
Ω
15
25
μA
60
μVrms
100
ppm/°C
20
ppm
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
Preliminary
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
VIN
RS
VREF
IR
UTC
M385-XX

APPLICATION CIRCUITS
R1
R1
-30V
4
VIN
(Note 1)
IOUT
3
2
7
6
IOUT
IOUT
2
UTC
M385-XX
C
150pF
R2
100K
VREF
=
R1
3
VIN
(Note 2)
IOUT
VREF
=
R1
4
6
7
30V
UTC
M385-XX
C
150pF
R2
100K
Precision 1µA to 1mA Current Source
9V
R1
VREF
(Note 3)
Micropower Reference from 9V Battery
Reference from 1.5V Battery (Only for M385-1.2V)
Notes: 1. VREF=1.235V, -2.3V≤V+≤-27V, VREF=2.5V, -3.7≤V+≤-27V
2. VREF=1.235V, 2.3V≤V+≤27V, VREF=2.5V, 3.7≤V+≤27V
3. VREF=1.235V, R1=900KΩ, VREF=2.5V, R1=220KΩ
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M385
Preliminary
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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