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参数资料
| 型号： | TK7403232LCLEX |
| 厂商： | TOKO INC |
| 元件分类： | 固定正电压多路输出LDO稳压器 |
| 英文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO8 |
| 封装： | SOT-23, 8 PIN |
| 文件页数： | 6/30页 |
| 文件大小： | 913K |
| 代理商： | TK7403232LCLEX |
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TOKO@Inc.
IC Data Sheet
TK740xxL
May 2001
GC3-H010 /D
Page 14
low I/O voltage difference and High current LDO
Connect the following terminals: pin5 and pin8, pin1 and pin4, pin2 and pin3.
Vdrop=70mV at 100mA: 125mV at 200mA: 180mV at 300mA is typically obtained.
Attention when this application is adopted
The control current and the no load current double because the A and B circuits are connected in parallel. A very
large current flows at the output during a short-circuit. Therefore, there is a possibility of damage by the current.
Please note the short-circuit of the output side and GND. The current value that can regularly be delivered is
300-400mA. The output current is limited by the permissible electric power loss of the package. The current
cannot be delivered exceeding this. However, a large peak current can be delivered for the pulse load with little
generation of heat. The permissible loss increases by improving heat radiation. Please make the copper pattern in
the IC part installation as wide as possible.
For instance, the permissible electric power loss increases greatly if the board thermal plane is bonded to the IC.
The characteristic of this application is not guaranteed immediately because Toko does not test to this application.
The characteristic of this application is almost obtained by guaranteeing the characteristic on the A side and the
B side. The difference appears large; use care when designing.
Improvement of load regulation with high current application
Please connect a resistor (Max=1.2\1.6) between pin6 of the TK740xx and GND.
The load regulation is greatly improved. Please enlarge the I/O capacitors.
u in
GND
1
4
5
8
CL 1
0.22
F
Vout
Cont
FbB
FbA
U
h
outimAj
Load regulation
200
100
0
300
400
Vout
(10mV/Div)
Vout
Typ
Rg=1.6
0
200
Iout(mA)
100
Ignd.
2
4
6mA
8
0
10
Iout vs Ignd A+B
Vdrop
(mVj
0
200
Iout(mA)
100
-50
-100
-150
-200
0
-250
Drop out Voltage A{B
B
A
A+B
Vout
V
Short circuit current
0
500
Iout (mA)
1000
1
2
3
4
0
5
h outimAj
Load regulation
200
100
0
300
400
Vout
Typ
Vout
(10mV/Div)
uin
GND
1
4
5
8
CL 1
0.22F
Vout
Cont
FbB
FbA
Rg
U
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