MAX1600 查看數據表（PDF） - Maxim Integrated

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MAX1600

Dual-Channel CardBus and PCMCIA VCC/VPP Power-Switching Networks

Maxim Integrated 

Dual-Channel CardBus and PCMCIA VCC/VPP

Power-Switching Networks

controlled, and makes them nearly independent of resis-

tive and capacitive loads (see rise-time photos in the

Typical Operating Characteristics). Fall times are a

function of loading, and are compensated by internal

circuitry.

Power savings is automatic: internal charge pumps draw

very low current when the VCC switches are static.

Standby mode reduces switch supply current to 1µA.

Driving the VL pin low with an external logic gate (master

shutdown) reduces total supply current to1µA (Figure 2).

Operating Modes

The MAX1600/MAX1603 are compatible with the Cirrus

CL-PD67XX, Databook DB86184, and Intel 82365SL PC

Card Interface Controllers (PCIC). Eight control inputs

select the internal switches’ positions and the operating

modes according to the input code. Select the proper

code format for the chosen controller with the CODE

input pin (see Pin Description and Tables 1, 2, and 3).

CODE reconfigures the logic decoder to one of three

interface controllers:

Low = Standard “Intel” code (Figure 5)

High = “Cirrus” code (Figure 4)

Midsupply = “Databook” code (Figure 6)

An additional 1µA (3µA max) of VL supply current will

flow if CODE = midsupply (VL / 2).

The MAX1600/MAX1603 have three operating modes:

normal, standby, and shutdown. Normal mode supplies

the selected outputs with their appropriate supply volt-

ages. Standby mode places all switches at ground,

high impedance, or a combination of the two. Shutdown

mode turns all switches off, and puts the VCC and VPP

outputs into a high-impedance state. Pull VL low to

enter shutdown mode. To ensure a 0.05V/µs fall rate on

VL, use a 1kΩ series resistor and a 0.1µF capacitor to

ground (Figure 2).

Overcurrent Protection

Peak detecting circuitry protects both the VCC and VPP

switches against overcurrent conditions. When current

through any switch exceeds the internal current limit

(4A for VCC switches and 200mA for VPP switches) the

switch turns off briefly, then turns on again at the con-

trolled rise rate. If the overcurrent condition lasts more

than 2µs, the FAULT output goes low. FAULT is not

latched. A continuous short-circuit condition results in a

pulsed output current and a pulsed FAULT output until

thermal shutdown is reached. FAULT is open-drain and

requires an external pull-up resistor.

Thermal Shutdown

If the IC junction temperature rises above +150°C, the

thermal shutdown circuitry opens all switches, including

the GND switches, and FAULT is pulled low. When the

temperature falls below +130°C, the switches turn on

again at the controlled rise rate. If the overcurrent con-

dition remains, the part cycles between thermal shut-

down and overcurrent.

Undervoltage Lockout

If the VX or VY switch input voltage drops below 1.5V,

the associated switch turns off and FAULT goes low.

For example, if VY is 3.3V and VX is 0V, and if the inter-

face controller selects VY, the VCCA output will be

3.3V. If VX is selected, VCCA changes to a high-imped-

ance output and FAULT goes low.

When a voltage is initially applied to 12IN_, it must be

greater than 8V to allow the switch to operate.

Operation continues until the voltage falls below 2V (the

VPP output is high impedance).

When VL drops to less than 2.3V, all switches are

turned off and the VCC and VPP outputs are high

impedance.

3.3V

1k

VY VPPA

VL

VCCA

TO

74HC04 0.1µF

MAX1600

MAX1603

SOCKETS

A AND B

+5V

VPPB

VCCB

VL

MAX1600

VX MAX1603

VY

Figure 2. Master Shutdown Circuit

Figure 3. Applying Power to the VL Input

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