Datasheet MIC2561-0BM, MIC2561-1BM Datasheet (MICREL)

Page 1

MIC2561 Micrel

MIC2561

PCMCIA Card Socket VCC & VPP Switching Matrix

General Description

The MIC2561 VCC & VPP Matrix controls PCMCIA (Personal Computer Memory Card International Association) memory card power supply pins, both VCC and VPP. The MIC2561 switches voltages from the system power supply to VCC and VPP. The MIC2561 switches between the three VCC voltages (OFF, 3.3V and 5.0V) and the VPP voltages (OFF, 0V, 3.3V, 5V, or 12.0V) required by PCMCIA cards. Output voltage is selected by two digital inputs for each output and output current ranges up to 750mA for VCC and 200mA for VPP. For higher VCC output current, please refer to the full-performance MIC2560.

The MIC2561 provides power management capability under the control of the PC Card controller and features overcurrent and thermal protection of the power outputs, zero current “sleep” mode, suspend mode, low power dynamic mode, and ON/OFF control of the PCMCIA socket power.

The MIC2561 is designed for efficient operation. In standby (“sleep”) mode the device draws very little quiescent current, typically 0.01µA. The device and PCMCIA port is protected by current limiting and overtemperature shutdown. Full crossconduction lockout protects the system power supply.

Ordering Information

Part Number Temperature Range Package

MIC2561-0BM 0°C to +70°C 14-pin SOIC

Applications

• PCMCIA Power Supply Pin Voltage Switch

• Data Collection Systems

• Machine Control Data Input Systems

• Wireless Communications

• Bar Code Data Collection Systems

• Instrumentation Configuration/Datalogging

• Docking Stations (portable and desktop)

• Power Supply Management

• Power Analog Switching

Features

• Complete PCMCIA VCC and VPP Switch Matrix in a Single IC

• No External Components Required

• Controlled Switching Times

• Logic Options for Compatible with Industry Standard PCMCIA Controllers

• No Voltage Overshoot or Switching Transients

• Break-Before-Make Switching

• Output Current Limit and Over-Temperature Shutdown

• Digital Flag for Error Condition Indication

• Ultra Low Power Consumption

• Digital Selection of VCC and VPP Voltages

• Over 750mA of VCC Output Current

• 200mA of VPP Output Current

• 14-Pin SOIC Package

MIC2561-1BM 0°C to +70°C 14-pin SOIC

T ypical Application

System

Power

Supply

PCMCIA

Card Slot

Controller

3.3V

12V

VPPIN V

CC3

EN0

EN1

MIC2561

CC5_EN

CC3_EN

CC5

PP1

PP2

PCMCIA

Card Slot

2-30 1997

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MIC2561 Micrel

Absolute Maximum Ratings (Notes 1 and 2)

Power Dissipation, T

SOIC............................................................ 800 mW

Derating Factors (To Ambient)

SOIC........................................................... 4 mW/°C

Storage Temperature ............................–65°C to +150°C

Maximum Operating Temperature (Die) ................ 125°C

Operating Temperature (Ambient) ..............0°C to +70°C

Lead Temperature (5 sec)...................................... 260°C

AMBIENT

≤ 25°C ....

Internally Limited

Supply Voltage, V

IN ....................................................... V

CC3

IN ............................................................. 7.5V

CC5

Logic Input Voltages.................................. –0.3V to +15V

Output Current (each Output)

PP OUT

CC OUT

..............................................

............................................

, Suspend Mode.............................. 600mA

...................................................

PP IN

Internally Limited

CC5

15V

Pin Configuration

Note: Both V

Logic Block Diagram

CC5_EN

CC3_EN

EN0 EN1

FLAG

VPP IN

VPP OUT

14-Pin SO Package

IN pins must be connected. All three V

CC3

EN1

14 13

5 6

9 8

GND

CC3

CC5

OUT

OUT pins must be connected.

550mΩ

PP OUT

MIC2561

Control

EN0

CC5_EN

CC3_EN

CC3

CC5

Flag

1997 2-31

Limit

Logic

/ Thermal Shut Down

700mΩ

CC OUT

210mΩ

2Ω

110mΩ

GND

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MIC2561 Micrel

Electrical Characteristics:

(Over operating temperature range with V

CC3

IN = 3.3V, V

IN = 5.0V, VPP IN = 12V unless

CC5

otherwise specified.)

Symbol Parameter Conditions Min Typ Max Units

INPUT

Logic 1 Input Voltage 2.2 15 V Logic 0 Input Voltage –0.3 0.8 V Input Current 0 V < VIN < 5.5V ±1 µA

VPP OUTPUT

PP OUT

Hi-Z Leakage Current 0 ≤ V

PPSC

High Impedance Output Shutdown Mode 0.1 50 µA

PP OUT

Short Circuit Current Limit V

PP OUT

Switch Resistance, Select V I

PP OUT

= –1000mA (Sourcing) Select V

Select V

≤ 12V

= 0 0.2 A

PP OUT PP OUT PP OUT

= 12V 0.55 1 Ω

= 5V 0.7 1

= 3.3V 2 3

Switch Resistance, Select V

PP OUT

= 50µA (Sinking)

VPP SWITCHING TIME (See Figure 1)

Output Turn-On Rise Time V

Output Rise Time V

Output Turn-Off Delay V

VCC OUTPUT

CC OUT

High Impedance Output 1 ≤ V

Hi-Z Leakage Current

PP OUT

CC OUT

= Clamped to Ground 0.75 2 kΩ

= Hi-Z to 5V 50 µs

= Hi-Z to 3.3V 40 µs

= Hi-Z to 12V 300 µs

= 3.3V or 5V to 12V 30 µs

= 12V to 3.3V or 5V 25 75 µs

= 5V to Hi-Z 75 200 ns

≤ 5V 0.1 10 µA

CCSC

Short Circuit Current Limit V

Switch Resistance, I V

CC OUT

= 5.0V

Switch Resistance, I V

CC OUT

= 3.3V

CC OUT

= 0 1.5 2 A

= –650 mA (Sourcing) 210 300 mΩ

= –650 mA (Sourcing) 110 185 mΩ

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MIC2561 Micrel

Electrical Characteristics (continued)

Symbol Parameter Conditions Min Typ Max Units

VCC SWITCHING TIME

Rise Time (10% to 90%) V

Fall Time (note 3) V

Rise Time V

POWER SUPPLY

CC5

CC3

IN V

CC5

CC3

PP OUT

= 0V to 3.3V, I

= 0V to 5.0V 50 60 µs

= 5.0V to 0V or 3.3V to 0V 40 µs

= Hi-Z to 5V 60 µs

= 0 0.01 10 µA

= 5V or 3.3V, I = Hi-Z (Sleep Mode) 0.01 10

IN Supply Current I

IN Supply Current V

CC OUT

IN Supply Current VCC Active, V

PP OUT

= HiZ, 0, or V

PP OUT

= 750mA 70 140 µs

OUT

CC OUT

= 0 30 100 µA

= 5V or 3.3V 15 30 µA

0.01 10

IN Operating Input Voltage V

CC5

IN Operating Input Voltage V

CC3

PP IN

Operating Input Voltage 8.0 12.0 14.5 V

CC5

CC3

IN ≥ V

IN ≤ V

IN V

CC3

IN 2.8 3.3 V

CC5

IN 5.0 6 V

CC3

IN V

CC5

SUSPEND MODE (NOTE 6)

CC3

RON V

NOTE 1: Functional operation above the absolute maximum stress ratings is not implied. NOTE 2: Static-sensitive device. Store only in conductive containers. Handling personnel and equipment should be grounded to prevent damage

NOTE 3: From 90% of V NOTE 6: Suspend mode is a pseudo power-down mode the MIC2561 automatically allows when V

Suspend Mode Active Current V (from V

CC OUT RON

from static discharge.

OUT = 3.3V is selected. Under these conditions, the MIC2561 functions in a reduced capacity mode where VCC output of 3.3V is allowed, but at lower current levels (higher switch ON resistance).

CC3

to 10% of V

OUT

. RL = 2.1kΩ

OUT

= 0V, V

PP IN

= Enabled

CC5

= Disabled (Hi-Z or 0V)

= 0V, V

PP IN

= Enabled

CC3

= Disabled (Hi-Z or 0V)

CC5

= V

= 3.3V 30 100 µA

CC3

= 3.3V 4.5 6 Ω

CC3

= 0V, VPP OUT is deselected, and V

PP IN

1997 2-33

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MIC2561 Micrel

MIC2561-0 Control Logic Table

Pin 1 Pin 2 Pin 4 Pin 3 Pins 8 & 12 Pin 7

CC5_EN

0000 High Z High Z 0001 High Z High Z 0010 High Z High Z 0011 High Z Clamped to Ground 0100 3.3 High Z 0101 3.3 3.3 0110 3.3 12 0111 3.3Clamped to Ground 1000 5 High Z 1001 5 5 1010 5 12 1011 5Clamped to Ground 1100 3.3 High Z 1101 3.3 3.3 1110 3.3 5 1111 3.3Clamped to Ground

CC3_EN

EN1 EN0 V

CC OUT

PP OUT

MIC2561-1 Logic (Compatible with Cirrus Logic CL-PD6710 & CL-PD6720 Controllers)

Pin 1 Pin 2 Pin 4 Pin 3 Pins 8 & 12 Pin 7

CC5_EN

0000 High Z Clamped to Ground 0001 High Z High Z 0010 High Z High Z 0011 High Z High Z 0100 5Clamped to Ground 0101 5 5 0110 5 12 0111 5 High Z 1000 3.3Clamped to Ground 1001 3.3 3.3 1010 3.3 12 1011 3.3 High Z 1100 High Z Clamped to Ground 1101 High Z High Z 1110 High Z High Z 1111 High Z High Z

CC3_EN

PP_PGM

PP_VCC

CC OUT

PP OUT

Note: other control logic patterns are available. Please contact Micrel for details.

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MIC2561 Micrel

Applications Information

PCMCIA VCC and VPP control is easily accomplished using the MIC2561 voltage selector/switch IC. Four control bits determine V

CC OUT

operate mode condition. V (3.3V or 5V), VPP, or a high impedance state are available. When the VCC high impedance condition is selected, the device switches into “sleep” mode and draws only nanoamperes of leakage current. An error flag falls low if the output is improper, because of overtemperature or overcurrent faults. Full protection from hot switching is provided which prevents feedback from the V 12V to 5V, for example) by locking out the low voltage switch until V

PP OUT

drops below VCC. The VCC output is similarly

protected against 5V to 3.3V shoot through. The MIC2561 is a low-resistance power MOSFET switching

matrix that operates from the computer system main power supply. Device logic power is obtained from V internal MOSFET drive is obtained from the VPP IN pin (usually +12V) during normal operation. If +12V is not available, the MIC2561 automatically switches into “suspend” mode, where V

CC OUT

switch resistance. Internal break-before-make switches determine the output voltage and device mode.

and V

PP OUT

voltage and standby/

output voltages of V

to the VCC inputs (from

and

CC3

can be switched to 3.3V, but at higher

Supply Bypassing

External capacitors are not required for operation. The MIC2561 is a switch and has no stability problems. For best results however, bypass V

CC3

IN, V

CC5

IN, and V

IN inputs with filter capacitors to improve output ripple. As all internal device logic and voltage/current comparison functions are powered from the V

IN line, supply bypass of this

CC3

line is the most critical, and may be necessary in some cases. In the most stubborn layouts, up to 0.47µF may be necessary. Both V

CC OUT

and V

PP OUT

pins may have 0.01µF to 0.1µF capacitors for noise reduction and electrostatic discharge (ESD) damage prevention. Larger values of output capacitor might create current spikes during transitions, requiring larger bypass capacitors on the V

CC3

IN, V

CC5

IN, and V

IN pins.

PCMCIA Implementation

The Personal Computer Memory Card International Association (PCMCIA) specification requires two VPP supply pins per PCMCIA slot. VPP is primarily used for programming Flash (EEPROM) memory cards. The two VPP supply pins may be programmed to different voltages. Fully implementing PCMCIA specifications requires a MIC2561, a MIC2557 PCMCIA VPP Switching Matrix, and a controller. Figure 3 shows this full configuration, supporting both 5.0V and 3.3V VCC operation.

System

Power

Supply

PCMCIA

Card Slot

Controller

3.3V

12V

PP IN

PCMCIA

VPPIN V

CC3

EN0

EN1

MIC2561

CC5_EN

CC3_EN

INV

CC5

PP1

PP2

Card Slot

EN0

EN1

MIC2557

OUT

Figure 3. MIC2561 Typical PCMCIA memory card application with dual VCC (5.0V or 3.3V) and separate V

1997 2-35

PP1

and V

PP2.

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MIC2561 Micrel

System

Power

Supply

PCMCIA

Card Slot

Controller

3.3V

12V

VPPIN V

CC3

EN0

EN1

MIC2561

CC5_EN

CC3_EN

CC5

PP1

PP2

PCMCIA

Card Slot

Figure 4. MIC2561 Typical PCMCIA memory card application with dual VCC (5.0V or 3.3V). Note that V driven together.

However, many cost sensitive designs (especially notebook/ palmtop computers) connect V

PP1

to V

and the MIC2557

PP2

is not required. This circuit is shown in Figure 4. When a memory card is initially inserted, it should receive

VCC — 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 VPP and if the card is designed for dual VCC. If the card is compatible with and desires a different V level, the controller commands this change by disabling VCC, waiting at least 100ms, and then re-enabling the other V voltage.

level selected. The lockout delay time varies with the load current and the capacitor on V and nominal I

PP OUT

, the delay is approximately 250µs.

PP OUT

. With a 0.1µF capacitor

Internal drive and bias voltage is derived from V device control logic is powered from V

CC3

threshold voltages are compatible with common PCMCIA controllers using either 3.3V or 5V supplies. No pull-up resistors are required at the control inputs of the MIC2561.

Output Current and Protection

MIC2561 output switches are capable of more current than needed in PCMCIA applications and meet or exceed all PCMCIA specifications. For system and card protection, output currents are internally limited. For full system protec-

If no card is inserted or the system is in sleep mode, the controller outputs a (V MIC2561, which shuts down VCC. This also places the switch

CC3

IN, V

IN) = (0,0) to the

CC5

into a high impedance output shutdown (sleep) mode, where current consumption drops to nearly zero, with only tiny CMOS leakage currents flowing.

During Flash memory programming with standard (+12V) Flash memories, the PCMCIA controller outputs a (1,0) to the EN0, EN1 control pins of the MIC2561, which connects VPPIN to V

PP OUT

. The low ON resistance of the MIC2561 switches allow using small bypass capacitors (in some cases, none at all) on the V

CC OUT

and V

PP OUT

pins, with the main filtering action performed by a large filter capacitor on the input supply voltage to VPPIN (usually the main power supply filter capacitor is sufficient). The V

PP OUT

transition from VCC to 12.0V typically takes 15µs. After programming is completed, the controller outputs a (EN1, EN0) = (0,1) to the MIC2561, which then reduces V

PP OUT

to the VCC level for read verification. Break-before-make switching action reduces switching transients and lowers maximum current spikes through the switch from the output capacitor. The flag comparator prevents having high voltage on the VPP

OUT

capacitor from contaminating the VCC inputs, by disabling the low voltage VPP switches until VPP

drops below the V

OUT

tion, long term (millisecond or longer) output short circuits invoke overtemperature shutdown, protecting the MIC2561, the system power supplies, the card socket pins, and the memory card. The MIC2561 overtemperature shutdown occurs at a die temperature of 110°C.

Suspend Mode

An additional feature in the MIC2561 is a pseudo power-down mode, Suspend Mode, which allows operation without a V IN supply. In Suspend Mode, the MIC2561 supplies 3.3V to VCC OUT whenever a VCC output of 3.3V is enabled by the PCMCIA controller. This mode allows the system designer the ability to turn OFF the VPP supply generator to save power when it is not specifically required. The PCMCIA card receives VCC at reduced capacity during Suspend Mode, as the switch resistance rises to approximately 4.5Ω.

High Current VCC Operation Without a +12V Supply

Figure 5 shows the MIC2561 with VCC switch bias provided by a simple charge pump. This enables the system designer to achieve full VCC performance without a +12V supply, which is often helpful in battery powered systems that only provide +12V when it is needed. These on-demand +12V

PP1

and V

are

PP2

IN. Internal

IN. Input logic

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MIC2561 Micrel

Drive Enable

+5V

4.7kΩ

0.01µF

2 3

4 5

14 13

12 11

1N914

Switched V

1N9140.1µF

0.02µF

PP IN

(Optional Schottky)

6 7

Figure 5. Circuit for generating bias drive for the VCC switches when +12V is not readily available.

supplies generally have a quiescent current draw of a few milliamperes, which is far more than the microamperes used by the MIC2561. The charge pump of Figure 5 provides this low current, using about 100µA when enabled. When V = 12V is selected, however, the on-demand VPP generator

PP OUT

must be used, as this charge pump cannot deliver the current required for Flash memory programming. The Schottky diode may not be necessary, depending on the configuration of the on-demand +12V generator and whether any other loads are on this line.

1997 2-37