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參數(shù)資料
| 型號： | LV5254LG |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA24 |
| 封裝： | 3 X 3 MM, FLGA-24 |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 136K |
| 代理商： | LV5254LG |
LV5254LG
No.A0584-10/14
Next, consider figure 2, which shows the relationship between the input voltage VIN and the charge pump block
impedance Ron at Ta = 85°C, which is the maximum temperature for which operation is guaranteed. At Ta = 85°C, if
ΔVreg [min] = 0.3V (inferred worst case value), the LV5254's maximum output current can be expressed as equation
(4).
IO [max] = (VIN+VOUT-0.3) / Ron … (4)
The current capacity shown in figure 3 can be determined from the characteristics in figure 2 when VOUT is set to be
-3V.
Caution : The characteristics values presented in this reference documentation are nothing other than inferred worst-case
values. No guarantee or warranty is made with respect to these values.
Loss in the Charge Pump Capacitors
Voltage loss occurs in the pump capacitors C1 and C2 in the charge pump circuit. Figure 4 shows the charge pump
output vs. load current characteristics (with the C1 and C2 value as a parameter) at room temperature when VDD = 5V.
Note that the load regulation becomes worse as the value of the capacitors C1 and C2 is reduced. To minimize the loss
in these capacitor, we recommend using a value of 1
μF for C1 and C2.
Figure 4 : Charge Pump Output - Load Current Characteristics when VDD = 5V, data provided for reference
purposes.
Input voltage, VIN –V
Figure 2
Figure 3
CP
on-resistance,
Ron
–
Ω
Ron – VIN
15
23
21
19
17
25
3.5
5.5
5
4.5
46
Input voltage, VIN –V
Maximum
output
current,
I
O
max
–
m
Α
IO max – VIN
0
80
100
60
40
20
120
3.5
5
4.5
4
5.2
Ta = 85°C
Load current, IO –mA
Char
ge
pump
output,
VC2
–
V
Charge Pump Output – Load Current Characteristics
– 5
– 4.8
– 4.6
– 4.4
– 4.2
– 4
– 3.8
– 3.6
080
60
40
20
100
C1,
C2
=
0.22
μF
C1,
C2
=
0.47
μF
C1,
C2
=
1μ
F
Figure 2 : Charge Pump Block Impedance -
Input Voltage Characteristics
(Ta = 85°C) : Assumed Worst Case
(C1, C2 = 1
μF)
Figure 3 : Maximum Output Current - Input
Voltage Characteristics when
VOUT = -3V (Ta = 85°C) :
Assumed Worst Case
(C1, C2 = 1
μF)
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