Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UCM101
Preliminary
LINEAR INTEGRATED CIRCUIT
BIDIRECTIONAL PRECISION
HIGH-SIDE CURRENT
MONITOR
4
5

DESCRIPTION
The UTC UCM101 is a bidirectional precision high-side current
sense monitor. It uses UTC’s advanced technology to provide
customers with a minimum operating current, high accuracy, high
side voltage and a fixed gain of 10, etc.
The UTC UCM101’s output voltage is proportional to the
differential input voltage. Direction of current flow is indicated by
the Flag pin.
The UTC UCM101 is suitable for widely voltage range
applications and portable battery equipment.

1
2
3
SOT-25
FEATURES
* Low operating current
* High side voltage (2.7~20V)
* A fixed gain of 10
* High accuracy (typ=1%)

ORDERING INFORMATION
Ordering Number
UCM101G-AF5-R

Package
SOT-25
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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UCM101

Preliminary
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
S-
S+
5
4
1
2
3
Flag GND OUT

PIN DESCRIPTION
PIN NO.
PIN NAME
1
Flag
2
3
GND
OUT
4
S+
5
S-

DESCRIPTION
This is the current direction pin. It is open collector and allows the logic high level to be
set independent of VS+ voltage. Low indicates VS+ is greater than VSGround pin
Output voltage pin
This is the positive input of the current monitor. It also acts as the supply voltage pin
providing current for internal circuitry. The current through this pin varies with differential
sense voltage
This is the negative input of the current monitor. The current through this pin varies with
differential sense voltage
BLOCK DIAGRAM
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UCM101

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Voltage on VS- and VS+
-0.6~20
V
Voltage on all Other Pins
-0.6~(VS+ or VS-)+0.6
V
Vsense [(VS+) - (VS-)]
+/-6
V
at TA=25°C
PD
Package Power Dissipation
300
mW
(De-rate to zero at 150°C)
Operating Temperature
TA
-40~125
°C
Storage Temperature
TSTG
-55~150
°C
Maximum Junction Temperature
TJ
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.

RECOMMENDED OPERATIONG CONDITIONS
PARAMETER
Common-Mode Sense Input Range
Current Direction Flag Output
Differential Sense Input Voltage Range
Output Voltage Range
Ambient Temperature Range

SYMBOL
VS±
Flag
VSENSE
VOUT
TA
RATINGS
2.7~20
0~VS±
0~±0.8
0~VS±-1.5
-40~125
UNIT
V
V
V
V
°C
ELECTRICAL CHARACTERISTICS (Test conditions TA=25°C, VS+=10V, VSENSE=100mV)
PARAMETER
Ground Pin Current
VS+ Input Current
VS- Input Current
SYMBOL
IQ
IS+
IS-
Flag High
Output Voltage
VOUT
Flag Low
VOUT Variation with Temperature
VOUT/VSENSE
VOUT TC
Gain
Total Output Error (Gain + Offset)
Accuracy
Bandwidth
BW
VS+ Common Mode Rejection Ratio
Flag Trip Point
Flag Low Output Voltage
Flag High Leakage Current
CMRR
Flag TP
VFL
IFH
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TEST CONDITIONS
VSENSE=0V
VSENSE=0V
VSENSE=+150mV
VSENSE=+100mV
VSENSE=+30mV
VSENSE=0V
VSENSE=-30mV
VSENSE=-100mV
VSENSE=-150mV
VSENSE=±100mV
VSENSE=100mV
VSENSE=-100mV
VSENSE(DC)=100mV
VSENSE(AC)=63mVPP
VIN=2.7~20V
Referred to VSENSE
ISINK=100µA
VOH=5V
MIN
15
10
10
1.55
1.02
309
0
285
0.95
1.42
TYP
35
17
17
1.5
1
300
300
1
1.50
30
10
MAX
50
24
24
1.45
0.98
291
15
315
1.05
1.58
UNIT
µA
µA
µA
V
V
mV
mV
mV
V
V
ppm/ºC
±2
±5
%
%
300
kHz
60
-2.5
60
+2.5
200
1
dB
mV
mV
µA
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UCM101

Preliminary
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
A common application for micro-power current monitors is measuring the discharge current of a rechargeable
lithium ion/polymer battery. The UTC UCM101 enables measuring both the charge and discharge current into the
battery and with its wide operating voltage of 2.5~20V enables it to measure the currents in to/ out of up to 4 cells
connected in series.
When choosing appropriate values for RSENSE a compromise must be reached between in-line signal loss
(including potential power dissipation effects) and small signal accuracy.
Higher values for RSENSE gives better accuracy at low load currents by reducing the inaccuracies due to internal
offsets. For best operation the UTC UCM101 has been designed to operate with VSENSE of the order of
50mV~150mV.

TYPICAL APPLICATION CIRCUIT
VIN-
RS
VIN+
4
S+
5
SUTC
UCM101
GND
2
1
Flag
OUT
3
VOUT
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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