ZXCT1009FTA Diodes Zetex, ZXCT1009FTA Datasheet - Page 5
![IC CURRENT MONITOR 1% SOT23-3](/photos/5/28/52827/89-sot-23_sml.jpg)
ZXCT1009FTA
Manufacturer Part Number
ZXCT1009FTA
Description
IC CURRENT MONITOR 1% SOT23-3
Manufacturer
Diodes Zetex
Specifications of ZXCT1009FTA
Function
Current Monitor
Sensing Method
High-Side
Accuracy
±1%
Voltage - Input
2.5 ~ 20 V
Current - Output
10.2mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ZXCT1009FTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ZXCT1009FTA
Manufacturer:
DIODES
Quantity:
36 000
Company:
Part Number:
ZXCT1009FTA
Manufacturer:
DIODES
Quantity:
249 000
Part Number:
ZXCT1009FTA
Manufacturer:
ZETEX
Quantity:
20 000
Application Information
The above figure shows the ZXCT1009 supporting the
Benchmarq bq2954 Charge Management IC. Most of the
support components for the bq2954 are omitted for clarity.
This design also uses the Diodes FZT789A high current
Super-ß PNP as the switching transistor in the DC-DC step
down converter and the FMMT451 as the drive NPN for the
FZT789A. The circuit can be configured to charge up to four
Li-Ion cells at a charge current of 1.25A. Charge can be
terminated on maximum voltage, selectable minimum
current, or maximum time out. Switching frequency of the
PWM loop is approximately 120kHz.
The
replacement for the ZDS1009, which is featured in a
complete design from Unitrode/Texas Instruments on the
Li-Ion
DVS2954S1H Li-Ion Charger Development System.
ZXCT1009
Document number: DS33441 Rev. 12 - 2
Li-Ion Charger Circuit
ZXCT1009
charger
is
circuit
intended
shown
(cont.)
as
a
above.
direct
Reference:
functional
www.diodes.com
5 of 8
Transient Protection
An additional resistor, R
(as below), to limit the current from I
connected to V
transients. This can be of particular use in automotive
applications where load dump and other common transients
need to be considered.
Assuming the worst case condition of V
low impedance to a transient, the minimum value of R
given by:-
V
V
I
The maximum value of R
the dropout voltage (see transfer characteristic on page 3) of
the ZXCT1009 :-
V
V
V
PK
PK
MAX
IN(MIN)
DP
OUT(MAX)
ZXCT1009 with additional current limiting Resistor R
R
= Peak output current = 40mA
= Peak transient voltage to be withstood
= Dropout Voltage
LIM(MAX)
= Maximum working voltage = 20V
= Minimum Supply Operating Voltage
= Maximum Operating Output Voltage
= R
HIGH-SIDE CURRENT MONITOR
V
V
R
IN
IN
LIM(min)
OUT
OUT
2
2
[V
V
V
SENSE+
SENSE+
will be protected from input voltage
ZXCT1009
ZXCT1009
IN(MIN)
= (V
LIM
R
R
LIM
SENSE
SENSE
1
1
I
I
OUT
OUT
can be added in series with R
PK
is set by V
– (V
R
R
R
R
V
V
– V
SENSE-
SENSE-
LIM
LIM
OUT
OUT
DP
3
3
MAX
ZXCT1009
+ V
V
V
To load
To load
)/I
OUT
OUT
IN(MIN)
OUT
PK
OUT(MAX)
OUT
© Diodes Incorporated
= 0V; providing a
, V
. Any circuit
OUT(MAX)
)]/V
April 2011
OUT(MAX)
LIM
LIM
OUT
and
.
is