Datasheet

MAX1602
Single-Channel CardBus and PCMCIA VCC/VPP
Power-Switching Network
_______________________________________________________________________________________ 9
_________Logic Truth Tables (cont.)
Table 3. “Databook” Code,
CODE = Mid-Supply (VY/2)
STBY = Standby Mode, X = Don’t Care
MODE
Active
Active
Active
Active
Active
A1VCC
STBY
AVPP
1
Active
STBY
0
1 1
1 0
0 1
1
A0VPP
1
VPP
X VCC
X GND
X
0
0
VCC
X
0
12IN
X
1
0
GND
0
X
X High-Z
12IN
X GND
VCC
VX
VY
VY
VX
VX
A0VCC
1
0
0
1
1
0
0
1
GND
VY
GND
MAX1602
CURRENT
LIMIT
6Ω
1Ω
0.25Ω
0.25Ω
VB3
VB12
40Ω
40Ω
DECODE 
LOGIC
AND UVLO
CHARGE
PUMP
CURRENT
LIMIT
CHARGE
PUMP
CURRENT
LIMIT
THERMAL
SHUTDOWN
VCC
VCC
FAULT
GND
VCC
VCC
VPP12IN
VY
VY
VX
CONTROL
INPUTS
VDD
SHDN
VB5
CHARGE
PUMP
Figure 1. Detailed Block Diagram
_______________Detailed Description
The MAX1602 power-switching IC contains a network of
low-resistance MOSFET switches that deliver selectable
VCC and VPP voltages to two CardBus or PC Card host
socket. Figure 1 is the detailed block diagram.
The power-input pins (VY, VX, 12IN) are completely
independent, however, power must always be applied
to VY for proper operation. Low inrush current is guaran-
teed by controlled switch rise times. VCC’s 100µs mini-
mum output rise time is 100% tested with a 1µF
capacitive load, and VPP’s 1ms minimum rise time is
guaranteed with a 0.1µF load. These respective capaci-
tive loads are chosen as worst-case card-insertion para-
meters. The internal switching control allows VCC and
VPP rise times to be controlled, and makes them nearly