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參數資料
| 型號： | MC34280FTB |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | Power Supply & Management IC for Handheld Electronic Products |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數： | 2/20頁 |
| 文件大?。?/td> | 380K |
| 代理商： | MC34280FTB |
MC34280
http://onsemi.com
2
Power
ON
Reset
Lithium
Battery
Backup
Voltage
Reference
Low
Battery
Detect
Current
Bias
Control and
Gate Drive
Startup
Current
Limt
Main Regulator with
Synchronous Rectifier
LIBATCL
LIBATON
LOWBATB
PORB
DGND
LOWBATSEN
14
13
12
11
10
9
GND
GND
RLBb
r = 900 k
RLBa
r = 300 k
LIBATIN
27
28
29
30
31
32
GND
N/C
LIBATOUT
VMAINGND
VMAINSW
1N5817
M2
M1
IREF
AGND
8
7
VREF
VBAT
GND
RMAINb
r = 1000 k
CMAINb
c = 100p
VBAT
VMAIN
PDELAY
VDD
VDD
4
VMAINFB
1
VBAT
2
6
5
VREF
GND
GND
Ren
r = 1000 k
VBAT
Battery
Lock
Switch
VMAIN
GND
CVDD
c = 20u
3
ENABLE
Riref
r = 480 k
R123
r = 5
CMAIN
c = 100u
10 V SMT
tantalum
LMAIN
L = 33u
(Rs < 60 mOhm
GND
Optional
CMAINbp
c = 100u
10 V SMT
tantalum
M3
d
s
d
s
d
s
GND
GND
Figure 1. Typical Application Block Diagram
Cpor
c = 80n
VAUXADJ
15
VAUXCON
16
VAUXEN
17
VBAT
LIBATCL
VAUXADJ
VAUXCON
VAUXEN
LIBATON
LOWBAT
PORB
VAUXFBP
GND
Optional
CAUXbp
c = 100u
10 V SMT
tantalum
VBAT
18
20
21
VAUXBDV
19
22
23
24
Level
Control
Current
Limt
Auxiliary Regulator
Control and
Base Drive
LAUX
L = 22u
(Rs < 60 mOhm
VAUXFBN
GND
Caux
c = 30u
30 V SMT
tantalum
VAUX
1N5818
GND
GND
VAUXREF
(1.1 V to 2.2 V)
VAUXCHG
VAUXBASE
N/C
Rauxb
r = 2.2 M
Rauxa
r = 200 k
GND
CAUXb
c = 2n
CAUXa
c = 33n
Q1
VAUXEMR
26
VAUXSW
25
Optional
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