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參數(shù)資料
| 型號： | MIC2557BMT&R |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | PCMCIA Card Socket VPP Switching Matrix |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 6/6頁 |
| 文件大?。?/td> | 51K |
| 代理商： | MIC2557BMT&R |
1997
2-9
MIC2557
Micrel
2
Figure 4. MIC2557 Palmtop application. Note that the
V
PP1
and V
PP2
pins are combined. Although this does
not fully satisfy PCMCIA specifications, it simplifies the
circuitry and is acceptable in certain applications.
V
PP OUT
. The low ON resistance of the MIC2557 switch
requires only a small bypass capacitor on V
PP OUT
, with the
main filtering action performed by a large filter capacitor on
V
PP IN
. The V
PP OUT
transition from V
CC
to 12.0V typically
takes 25
μ
S. After programming is completed, the controller
outputs a (0,1) to the MIC2557, which then reduces V
PP OUT
to the V
CC
level. Break-before-make switching action re-
duces switching transients and lowers maximum current
spikes through the switch from the output capacitor.
System
Power
Supply
MIC2557
PCMCIA
Card Slot
3.3V
3.3V to 12V
DC–DC
Converter
EN0
EN1
VPP1
VPP2
PCMCIA
Card Slot
Controller
VCC
Switch
VPP IN
VCC
VDD
If no card is inserted, or the system is in sleep mode, the
controller outputs either a (0,0) or a (1,1) to the MIC2557.
Either input places the switch into its shutdown mode, where
only a small leakage current flows.
The HiZ/Low input controls the optional logic low output
clamp. With HiZ/Low in the high state and ENO = EN1 = 0,
V
PP OUT
enters a high impedance (open) state. With HiZ/
Low in the low state and EN0 = EN1 = 0, V
PP OUT
is clamped
to ground, providing a logic low signal. The clamp does not
require DC bias current for operation.
MOSFET drive and bias voltage is derived from V
PP IN
.
Internal device control logic is powered from V
DD
, which
should be connected to the same supply voltage as the
PCMCIA controller (normally either 3.3V or 5V).
Output Current
MIC2557 output switches are capable of far more current
than usually needed in PCMCIA applications. PCMCIA V
PP
output current is limited primarily by switch resistance voltage
drop (
I
x
R
) and the requirement that V
PP OUT
cannot drop
more than 5% below nominal. V
PP OUT
will survive output
short circuits to ground if V
PP IN
and V
CC
are current limited
by the regulator that supplies these voltages.
相關PDF資料 |
PDF描述 |
|---|---|
| MIC2558 | PCMCIA Dual Card Socket VPP Switching Matrix |
| MIC2559 | Replaced by PT6502 : |
| MIC2559BM | Replaced by PT6502 : |
| MIC2559BMTR | PCMCIA Dual Card Socket VPP Switching Matrix |
| MIC2561 | PCMCIA Card Socket VCC & VPP Switching Matrix |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2558BM | 制造商:Micrel Inc 功能描述:PCMCIA Card Socket 14-Pin SOIC 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2560-0BWM | 功能描述:電源開關 IC - 配電 PCMCIA Card Sw. Matrix RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MIC2560-0BWM TR | 功能描述:電源開關 IC - 配電 PCMCIA Card Sw. Matrix RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MIC2560-0YWM | 功能描述:電源開關 IC - 配電 PCMCIA Card Sw. Matrix - Lead Free RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MIC2560-0YWM TR | 功能描述:電源開關 IC - 配電 PCMCIA Card Sw. Matrix - Lead Free RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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