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PDF CAT2300 Data sheet ( Hoja de datos )
| Número de pieza | CAT2300 | |
| Descripción | Current Monitor | |
| Fabricantes | ON Semiconductor | |
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CAT2300
SENSEFET) Current Monitor
for 0.9 V - 1.5 V Bus
Description
CAT2300 is a controller for SENSEFET® MOSFET current
monitoring in high-side switch applications.
CAT2300 provides current mirroring and ON/OFF control for
SENSEFET MOSFETs. Exact control and matching of the Sense
output of the SENSEFET with the Kelvin voltage insures accurate
current monitoring over a couple of decades of current.
Designed for use with NTMFS4833NST1G, NTMFS4854NST1G
or similar SENSEFET MOSFETs from ON Semiconductor, CAT2300
is the single chip alternative to discrete circuits for monitoring and
controlling 0.9 V − 1.5 V power busses. When teamed with a
SENSEFET, CAT2300 will track currents up to 25 A and resolve
currents below 100 mA.
CAT2300 provides logic level ON/OFF control of the power
MOSFET and its own internal circuitry, reducing power consumption
to virtually zero milliwatts.
Packaged in a space saving low profile 2 x 3 mm TDFN, CAT2300
operates over the full industrial temperature range of −40°C to +85°C.
Features
• Precision Current Measurement of 0.9 V − 1.5 V Power Supply Rails
• ON/OFF Power FET Control with Soft−start
• Sense Current Mirroring to 70 mA
(equal to 25 A flowing in the power bus)
• User Adjustable Current to Voltage Conversion Ratio
• 150 mV Typical Matching between Kelvin and Sense Leads
• Less than 1 mA Current Consumption in Shutdown Mode
• This Device is Pb−Free, Halogen Free/BFR Free and RoHS
Compliant
Typical Applications
• Portable Computers
• Backplane Bus Control
• Power Distribution
Power Bus
SENSEFET
System
Load
Enable
CAT2300
IMEASURE
http://onsemi.com
TDFN−8
VP2 SUFFIX
CASE 511AK
PIN CONFIGURATION
Sense
KS
Kelvin
Gate
1
(Top View)
IMEAS
EN
VDD
GND
MARKING DIAGRAM
F3T
LAA
YM
G
F3T = Specific Device Code
L = Assembly Location Code
AA = Assembly Lot Number
= (Last Two Digits)
Y = Production Year (Last Digit)
M = Production Month (1−9, O, N, D)
G = Pb−Free Microdot
ORDERING INFORMATION
Device Package Marking
Shipping†
CAT2300 TDFN F3T 3,000 / Tape &
Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Figure 1. System Application
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2012
November, 2012 − Rev. 2
1
Publication Order Number:
CAT2300/D
1 page  
CAT2300
VDD
VDD provides gate drive for the SENSEFET and power
for CAT2300’s internal circuitry and must be +5 V.
IMEAS
IMEAS is the mirror current output. Placing a resistor
between IMEAS and ground produces a voltage proportional
to IBUS. The maximum voltage producible at IMEAS is the
Kelvin voltage (VK) – 0.1 V. This sets a limitation on the
maximum value of RMEAS.
RMEAS
+
ǒVK * 0.1
ISENSE
VǓ
+
CSR
ǒVK * 0.1 VǓ
Ibus
where:
CSR = Current Sensing Ratio taken from the SENSEFET
data sheet.
Ibus = Max current through the SENSEFET.
EN
Enable is a high true logic input controlling the
SENSEFET’s ON/OFF state. A logic high on EN turns the
switch ON; a logic low turns it OFF.
Bus turn-ON time is controlled by the FET’s input gate
capacitance and the drive current applied to the gate.
To minimize power consumption EN disables the internal
gate drive current source and current mirroring circuitry
whenever the SENSEFET is OFF.
NTMF4834NS
VIN Drain
Ibus
Gate
Kelvin
Source
Sense
VOUT
ISense
Gate
Kelvin KS
Sense
VREG
VDD
EN
1 250 mA
0
+
−
IMEAS
VMEAS
CAT2300
GND
Figure 5. Typical Application
http://onsemi.com
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet CAT2300.PDF ] | |
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