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MC34280FTBR2 bảng dữ liệu(PDF) 5 Page - ON Semiconductor

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Giải thích chi tiết về linh kiện  Power Supply & Management IC for Handheld Electronic Products
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nhà sản xuất  ONSEMI [ON Semiconductor]
Trang chủ  http://www.onsemi.com
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MC34280
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5
PIN FUNCTION DESCRIPTION
Pin
No.
Function
Type/Direction
Description
1
VMAINFB
Analog / Input
Feedback pin for VMAIN
2
VBAT
Power
Main battery supply
3
ENABLE
CMOS / Input
Chip enable, Active high, ENABLE activates VMAIN after battery plug in,
ENABLE is inactive after VMAIN is on
4
VDD
Analog / Output
Connect to decoupling capacitor for internal logic supply
5
PDELAY
Analog / Input
Capacitor connection for defining Power–On signal delay
6
VREF
Analog / Output
Bandgap Reference output voltage. Nominal voltage is 1.25V
7
AGND
Analog Ground
8
IREF
Analog / Input
Resistor connection for defining internal current bias and PDELAY current
9
LOWBATSEN
Analog / Input
Resistive network connection for defining low battery detect threshold
10
DGND
Digital Ground
11
PORB
CMOS / Output
Active LOW Power–On reset signal
12
LOWBATB
CMOS / Output
Active LOW low battery detect output
13
LIBATON
CMOS / Input
microprocessor control signal for Lithium battery backup switch, the switch is
ON when LIBATON=HIGH and LIBATCL=HIGH
14
LIBATCL
CMOS / Input
microprocessor control signal for Lithium battery backup switch, if it is HIGH,
the switch is controlled by LIBATON, otherwise, controlled by internal logic
15
VAUXADJ
CMOS / Input
microprocessor control signal for VAUX voltage control
16
VAUXCON
CMOS / Input
microprocessor control signal for VAUX voltage control
17
VAUXEN
CMOS / Input
VAUX enable, Active high
18
VAUXFBP
Analog / Input
Feedback pin for VAUX
19
VAUXREF
Analog / Output
Reference Voltage for VAUX voltage level
20
VAUXFBN
Analog / Input
Feedback pin for VAUX
21
VAUXBDV
Power
VAUX BJT base drive circuit power supply
22
VAUXCHG
Analog / Output
test pin
23
VAUXBASE
Analog / Output
test pin
24
NC
no connection
25
VAUXSW
Analog / Output
Collector output of the VAUX power BJT
26
VAUXEMR
Analog / Output
Emitter output of the VAUX power BJT
27
LIBATIN
Analog / Input
Lithium battery input for backup purposes
28
LIBATOUT
Analog / Output
Lithium battery output
29
NC
no connection
30
VMAINGND
Power Ground
Ground for VMAIN low side switch
31
VMAINSW
Analog / Input
VMAIN inductor connection
32
VMAIN
Analog / Output
VMAIN output


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