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參數(shù)資料
| 型號(hào)： | MAX613 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual-Slot PCMCIA Analog Power Controllers(單插口PCMCIA標(biāo)準(zhǔn)模擬功率控制器) |
| 中文描述： | 雙槽、PCMCIA模擬電源控制器 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 121K |
| 代理商： | MAX613 |
_______________Detailed Desc ription
V PP S witc hing
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 0.01
μ
F.
______________________________________________________________Pin Desc ription
M
Dual-S lot PCMCIA
Analog Power Controllers
4
_______________________________________________________________________________________
PIN
MAX613
1
2
3
4
5
6
14
8
VPPIN
1
2
3
—
—
—
GND
AVPP1
AVPP0
BVPP1
BVPP0
VCC1
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.
7
4
VCC0
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.
—
5
DRV
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.
8
—
DRV5
Open-drain power MOSFET gate-driver output used to switch the slot VCC supply voltage (see
Table 3 in Detailed Description.
9
—
DRV3
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 –——— is low, DRV3 and DRV5 sink current regardless of the state of
VCC0 and VCC1. When –——— is high, DRV3 and DRV5 are controlled by VCC0 and VCC1.
10
—
–———
11
—
BVPP
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.
12
6
AVPP
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.
13
7
VCCIN
+5V power input
+12V power input. VPPIN can have 0V or +5V applied as long as VCCIN > 2.85V.
MAX614
NAME
FUNCTION
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