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參數(shù)資料
| 型號： | R5531V002 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 電源管理 |
| 英文描述： | PCMCIA Power Controller |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | SSOP-16 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 163K |
| 代理商： | R5531V002 |
12345
Rev. 1.10
-
5 -
V
PP
Timing Diagram
V
PP
Enable
V
PP
Output
V
PP
to 5V
FLG
0 V
V
PP
to 3.3V
C
D
B
A
0 V
0 V
t15
t16
t11
t 9
t13
t12
t 10
t14
V
PP
OFF
V
PP
OFF
I
OPERATION
(1) Operation Description
When the V
CCOUT
=0V is selected, the IC switches into the sleep mode, and draws only nano-amperes of leakage current.
Without being V
CCOUT
=0V, if commanded to immediately switch from 5V to 3.3V or vice versa, enhancement of the second
switch begins after the first is OFF, realizing "break-before-make switching".
In case that an OUT pin may be clamped to the GND, if over-current would continue, the temperature of the IC would increase
drastically. If the temperature of the IC is beyond Typ. 135
°
C, the switch transistor turns off. Then, when the temperature of the
IC decreases by approximately 10
°
C, the switch transistor turns on. Unless the abnormal situation of OUT pin is removed or
turned off, the switch transistor repeats on and off.
Short over-current level is set internally in the IC. There are two types of response against over-current: (1) Under the condition
that OUT pin is short or large capacity is loaded, if the IC is enabled, the IC becomes constant current state immediately.
Current level of constant current is short current limit. (2) While the switch transistor is on, if OUT pin is short or large capacity
is loaded, until the current limit circuit responds, large transient current flows. The transient current depends on the impedance
between the power supply circuit, VCC5IN/VCC3IN and load capacitance. In other words, the transient current depends on the
transient response characteristics of the power supply circuit, VCC5IN/VCC3IN, PCB layout, and the connector of the card.
After the transient current is beyond the current limit threshold and current limit circuit responds, the IC becomes into the
constant current mode, and the current level is equal to short current limit.
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