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| 型号： | MIC2562A-0BM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PCMCIA CARDBUS 14SOIC |
| 标准包装： | 2,500 |
| 类型： | PCMCIA/Cardbus 开关 |
| 输出数： | 2 |
| Rds（开）： | 150 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 1.5A |
| 输入电压： | 3.3V，5V，12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2562A-0BMTR |
MIC2562A
Applications Information
PC Card V CC and V PP control is easily accomplished using
the MIC2562A PC Card/CardBus slot V CC and V PP power
controller IC. Four control bits determine V CC OUT and
V PP OUT voltage and standby/operate mode condition. V CC
outputs of 3.3V and 5V at the maximum allowable PC Card
current are supported. V PP OUT output voltages of V CC (3.3V
or 5V), V PP , 0V, or a high impedance state are available.
When the V CC clamped to ground condition is selected, the
device switches into “ sleep ” mode and draws only nano-
amperes of leakage current. An error flag alerts the user if the
output voltage is too low because of overtemperature or
overcurrent faults. Protection from hot switching is provided
which prevents feedback from the V CC OUT (from 5V to 3.3V,
for example), by locking out the low-voltage switch until the
initial switch ’ s gate voltage drops below the desired lower
V CC .
The MIC2562A operates from the computer system ’ s main
power supply. Device logic and internal MOSFET drive is
generated internally by charge pump voltage multipliers
powered from V CC3 IN. Switching speeds are carefully con-
trolled to prevent damage to sensitive loads and meet all PC
Card specification speed requirements.
Supply Bypassing
External capacitors are not required for operation. The
MIC2562A is a switch and has no stability problems. For best
results however, bypass V CC3 IN, V CC5 IN, and V PP IN inputs
with 1 μ F capacitors to improve output ripple. As all internal
device logic and comparison functions are powered from the
V CC3 IN line, the power supply quality of this line is the most
important, and a bypass capacitor may be necessary for
some layouts. Both V CC OUT and V PP OUT pins may use
0.01 μ F to 0.1 μ F capacitors for noise reduction and electro-
static discharge (ESD) damage prevention. Larger values of
output capacitors are not necessary.
PC Card Slot Implementation
The MIC2562A is designed for full compatibility with the
PCMCIA PC Card Specification (March 1995), including the
CardBus option. One MIC2562A is required for each PC Card
slot.
When a memory card is initially inserted, it should receive
V CC (either 3.3V ± 0.3V or 5.0V ± 5%). The initial voltage is
determined by a combination of mechanical socket “ keys ”
and voltage sense pins. The card sends a handshaking data
stream to the controller, which then determines whether or
not this card requires V PP and if the card is designed for dual
V CC . If the card is compatible with and desires a different V CC
level, the controller commands this change by disabling V CC ,
waiting at least 100ms, and then re-enabling the other V CC
voltage.
V CC switches are turned ON and OFF slowly. If commanded
to immediately switch from one V CC to the other (without
turning OFF and waiting 100ms first), enhancement of the
second switch begins after the first is OFF, realizing break-
before-make protection. V PP switches are turned ON slowly
and OFF quickly, which also prevents cross conduction.
Micrel
If no card is inserted or the system is in sleep mode, the slot
logic controller outputs a (V CC3 IN, V CC5 IN) = (0,0) to the
MIC2562A, which shuts down V CC . This also places the
switch into a high impedance output shutdown (sleep) mode,
where current consumption drops to nearly zero, with only
tiny CMOS leakage currents flowing.
Internal device control logic, MOSFET drive and bias voltage
is powered from V CC3 IN. The high voltage bias is generated
by an internal charge pump quadrupler. Systems without
3.3V may connect V CC3 IN to 5V. Input logic threshold
voltages are compatible with common PC Card logic control-
lers using either 3.3V or 5V supplies.
The PC Card specification defines two V PP supply pins per
card slot. The two V PP supply pins may be programmed to
different voltages. V PP is primarily used for programming
Flash memory cards. Implementing two independent V PP
voltages is easily accomplished with the MIC2562A and a
MIC2557 PCMCIA V PP switching matrix. Figure 3 shows this
full configuration, supporting independent V PP and both 5.0V
and 3.3V V CC operation. However, few logic controllers
support multiple V PP — most systems connect V PP1 to V PP2
and the MIC2557 is not required. This circuit is shown in
Figure 4.
During flash memory programming with standard (+12V)
flash memories, the PC Card slot logic controller outputs a
(0,1) to the EN0, EN1 control pins of the MIC2562A, which
connects V PP IN (nominally +12V) to V PP OUT. The low on
resistance of the MIC2562A switch allows using a small
bypass capacitor on the V PP OUT pins, with the main filtering
action performed by a large filter capacitor on V PP IN (usually
the main power supply filter capacitor is sufficient). Using a
small-value capacitor such as 0.1 μ F on the output causes
little or no timing delays. The V PP OUT transition from V CC to
12.0V typically takes 250 μ s. After programming is com-
pleted, the controller outputs a (EN1, EN0) = (0,1) to the
MIC2562A, which then reduces V PP OUT to the V CC level.
Break-before-make switching action and controlled rise times
reduces switching transients and lowers maximum current
spikes through the switch.
Figure 5 shows MIC2562A configuration for situations where
only a single +5V V CC is available.
Output Current and Protection
MIC2562A output switches are capable of passing the maxi-
mum current needed by any PC Card. The MIC2562A meets or
exceeds all PCMCIA specifications. For system and card
protection, output currents are internally limited. For full system
protection, long term (millisecond or longer) output short circuits
invoke overtemperature shutdown, protecting the MIC2562A,
the system power supplies, the card socket pins, and the PC
Card. A final protective feature is the error FLAG, which signals
the PC Card slot logic controller when a fault condition exists,
allowing the controller to notify the user that the card inserted
has a problem. The open-drain FLAG monitors the voltage level
on both V CC OUT and V PP OUT and activates (pulls low) when
either output is 1V below its programmed level or an
overtemperature fault exists.
This FLAG signals output voltage transitions as well as fault
conditions. Refer to Figures 1 and 2 for details.
June 2004
8
M9999-062204
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| MIC2562A-0BTS | 功能描述:IC PCMCIA/CARDBUS CTRLR 16-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:- 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
| MIC2562A-0BTS TR | 功能描述:IC PCMCIA/CARDBUS CTRLR 16-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:- 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
| MIC2562A-0YM | 功能描述:电源开关 IC - 配电 PCMCIA/CardBus Socket Power Controller - Lead Free RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MIC2562A-0YM TR | 功能描述:电源开关 IC - 配电 PCMCIA/CardBus Socket Power Controller - Lead Free RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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