Dual-Slot PCMCIA
Analog Power Controllers
MAX613/MAX614
______________________________________________________________Pin Description
PIN
MAX613
1
2
3
4
5
6
7
—
8
9
10
11
12
13
14
MAX614
1
2
3
—
—
—
4
5
—
—
—
—
6
7
8
NAME
GND
AVPP1
AVPP0
BVPP1
BVPP0
VCC1
VCC0
DRV
DRV5
DRV3
–—
——
SHDN
BVPP
AVPP
VCCIN
VPPIN
Ground
Logic inputs that control the voltage on AVPP (see Table 1 in
Detailed Description).
Logic inputs that control the voltage on BVPP (see Table 2 in
Detailed Description).
Logic input that controls the state of DRV3 and DRV5 (see Table 3 in
Detailed Description).
Logic input that controls the state of DRV on the MAX614. On the MAX613, both VCC0 and
VCC1 control the state of DRV3 and DRV5 (see Table 3 in
Detailed Description).
Open-drain power MOSFET gate-driver output used to switch the slot VCC supply voltage.
DRV sinks current when VCC0 is high and goes high impedance when VCC0 is low.
Open-drain power MOSFET gate-driver output used to switch the slot VCC supply voltage (see
Table 3 in
Detailed Description).
Open-drain power MOSFET gate-driver output used to switch the slot VCC supply voltage (see
Table 3 in
Detailed Description).
–—
——
Logic-level shutdown input. When SHDN is low, DRV3 and DRV5 sink current regardless of the state of
–—
——
VCC0 and VCC1. When SHDN is high, DRV3 and DRV5 are controlled by VCC0 and VCC1.
Switched output, controlled by BVPP1 and BVPP0, that outputs 0V, +5V, or +12V. BVPP can
also be programmed to go high impedance (see Table 2 in
Detailed Description).
Switched output, controlled by AVPP1 and AVPP0, that outputs 0V, +5V, or +12V. AVPP can
also be programmed to go high impedance (see Table 1 in
Detailed Description).
+5V power input
+12V power input. VPPIN can have 0V or +5V applied as long as VCCIN > 2.85V.
FUNCTION
_______________Detailed Description
VPP Switching
The MAX613/MAX614 allow simple switching of
PCMCIA card VPP to 0V, +5V, and +12V. On-chip
power MOSFETs connect AVPP and BVPP to either
GND, VCCIN, or VPPIN. The AVPP0 and AVPP1 control
logic inputs determine AVPP’s state. Likewise, BVPP0
and BVPP1 control BVPP. AVPP and BVPP can also be
programmed to be high impedance.
Each PCMCIA card slot has two VPP voltage inputs
labeled VPP1 and VPP2. Typically, VPP1 supplies the
flash chips that store the low-order byte of the 16-bit
words, and VPP2 supplies the chips that contain the
high-order byte. Programming the high-order bytes
separately from the low-order bytes may be necessary
to minimize +12V current consumption. A single 8-bit
flash chip typically requires at most 30mA of +12V VPP
current during erase or programming.
Thus, systems with less than 60mA current capability
from +12V cannot program two 8-bit flash chips simulta-
neously, and need separate controls for VPP1 and VPP2.
Figure 1 shows an example of a power-control circuit
using the MAX613 to control VPP1 and VPP2 separately.
Figure 1’s circuit uses a MAX662 charge-pump DC-DC
converter to convert +5V to +12V at 30mA output current
capability without an inductor. When higher VPP cur-
rent is required, the MAX734 can supply 120mA.
Use the MAX614 for single-slot applications that do
not require a separate VPP1 and VPP2. Figure 2
shows the MAX614 interfaced to the Vadem VG-465
single-slot controller.
To prevent VPP overshoot resulting from parasitic
inductance in the +12V supply, the VPPIN bypass
capacitor’s value must be at least 10 times greater than
the capacitance from AVPP or BVPP to GND; the AVPP
and BVPP bypass capacitors must be at least 0.01µF.
4
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