MIC2561
Micrel
2-30
1997
MIC2561
PCMCIA Card Socket V
CC
& V
PP
Switching Matrix
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 V
CC
and V
PP
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 V
CC
and V
PP
Voltages
Over 750mA of V
CC
Output Current
200mA of V
PP
Output Current
14-Pin SOIC Package
General Description
The MIC2561 V
CC
& V
PP
Matrix controls PCMCIA (Personal
Computer Memory Card International Association) memory
card power supply pins, both V
CC
and V
PP
. The MIC2561
switches voltages from the system power supply to V
CC
and
V
PP
. The MIC2561 switches between the three V
CC
voltages
(OFF, 3.3V and 5.0V) and the V
PP
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 V
CC
and 200mA for V
PP
. For
higher V
CC
output current, please refer to the full-perfor-
mance 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 0.01
A. The device and PCMCIA port is protected by
current limiting and overtemperature shutdown. Full cross-
conduction lockout protects the system power supply.
Ordering Information
Part Number
Temperature Range
Package
MIC2561-0BM
0
C to +70
C
14-pin SOIC
MIC2561-1BM
0
C to +70
C
14-pin SOIC
Typical Application
System
Power
Supply
PCMCIA
Card Slot
Controller
MIC2561
PCMCIA
Card Slot
5V
3.3V
12V
EN0
EN1
VPP1
VCC
VPPIN
VCC5IN
VCC3IN
VCC5_EN
VCC3_EN
VPP2
MIC2561
Micrel
1997
2-31
2
Absolute Maximum Ratings
(Notes 1 and 2)
Power Dissipation, T
AMBIENT
25
C ....
Internally Limited
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
Supply Voltage, V
PP IN ...................................................
15V
V
CC3
IN ....................................................... V
CC5
IN
V
CC5
IN ............................................................. 7.5V
Logic Input Voltages .................................. 0.3V to +15V
Output Current (each Output)
V
PP OUT ..............................................
Internally Limited
V
CC OUT ............................................
Internally Limited
V
CC OUT
, Suspend Mode .............................. 600mA
VCC3 IN
EN1
GND
VPP OUT
VCC OUT
VPP IN
VCC5_EN
EN0
VCC5 IN
VCC3_EN
MIC2561
Control
Logic
Flag
ILimit / Thermal Shut Down
550m
700m
210m
2
110m
Pin Configuration
GND
7
6
5
4
3
2
11
10
12
13
14
8
9
VCC3 IN
VCC OUT
VCC5_EN
VCC3_EN
EN0
EN1
FLAG
VPP IN
VCC OUT
VCC5 IN
VPP OUT
VCC OUT
VCC3 IN
14-Pin SO Package
Note: Both V
CC3
IN pins must be connected. All three V
CC
OUT pins must be connected.
Logic Block Diagram
MIC2561
Micrel
2-32
1997
Electrical Characteristics:
(Over operating temperature range with V
CC3
IN
= 3.3V, V
CC5
IN = 5.0V, V
PP
IN = 12V unless
otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
INPUT
V
IH
Logic 1 Input Voltage
2.2
15
V
V
IL
Logic 0 Input Voltage
0.3
0.8
V
I
IN
Input Current
0 V < V
IN
< 5.5V
1
A
V
PP
OUTPUT
I
PP OUT
High Impedance Output
Shutdown Mode
0.1
50
A
Hi-Z
Leakage Current
0
V
PP OUT
12V
I
PPSC
Short Circuit Current Limit
V
PP OUT
= 0
0.2
A
R
O
Switch Resistance,
Select V
PP OUT
= 12V
0.55
1
I
PP OUT
= 1000mA (Sourcing)
Select V
PP OUT
= 5V
0.7
1
Select V
PP OUT
= 3.3V
2
3
R
O
Switch Resistance,
Select V
PP OUT
= Clamped to Ground
0.75
2
k
I
PP OUT
= 50
A (Sinking)
V
PP
SWITCHING TIME (See Figure 1)
t
1
Output Turn-On Rise Time
V
PP OUT
= Hi-Z to 5V
50
s
t
2
Output Turn-On Rise Time
V
PP OUT
= Hi-Z to 3.3V
40
s
t
3
Output Turn-On Rise Time
V
PP OUT
= Hi-Z to 12V
300
s
t
4
Output Rise Time
V
PP OUT
= 3.3V or 5V to 12V
30
s
t
5
Output Turn-Off Delay
V
PP OUT
= 12V to 3.3V or 5V
25
75
s
t
6
Output Turn-Off Delay
V
PP OUT
= 5V to Hi-Z
75
200
ns
V
CC
OUTPUT
I
CC OUT
High Impedance Output
1
V
CC OUT
5V
0.1
10
A
Hi-Z
Leakage Current
I
CCSC
Short Circuit Current Limit
V
CC OUT
= 0
1.5
2
A
R
O
Switch Resistance,
I
CC OUT
= 650 mA (Sourcing)
210
300
m
V
CC OUT
= 5.0V
R
O
Switch Resistance,
I
CC OUT
= 650 mA (Sourcing)
110
185
m
V
CC OUT
= 3.3V
MIC2561
Micrel
1997
2-33
2
Electrical Characteristics (continued)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
CC
SWITCHING TIME
t
1
Rise Time (10% to 90%)
V
CC OUT
= 0V to 3.3V, I
OUT
= 750mA
70
140
s
t
2
Rise Time (10% to 90%)
V
CC OUT
= 0V to 5.0V
50
60
s
t
3
Fall Time (note 3)
V
CC OUT
= 5.0V to 0V or 3.3V to 0V
40
s
t
4
Rise Time
V
CC OUT
= Hi-Z to 5V
60
s
POWER SUPPLY
I
CC5
V
CC5
IN Supply Current
I
CC OUT
= 0
0.01
10
A
I
CC3
V
CC3
IN Supply Current
V
CC OUT
= 5V or 3.3V, I
CC OUT
= 0
30
100
A
V
CC OUT
= Hi-Z (Sleep Mode)
0.01
10
I
PP
IN
V
PP
IN Supply Current
V
CC
Active, V
PP OUT
= 5V or 3.3V
15
30
A
I
PP OUT
=0
V
PP OUT
= HiZ, 0, or V
PP
0.01
10
V
CC5
IN
Operating Input Voltage
V
CC5
IN
V
CC3
IN
V
CC3
IN
5.0
6
V
V
CC3
IN
Operating Input Voltage
V
CC3
IN
V
CC5
IN
2.8
3.3
V
CC5
IN
V
V
PP IN
Operating Input Voltage
8.0
12.0
14.5
V
SUSPEND MODE (NOTE 6)
I
CC3
Suspend Mode Active Current
V
PP IN
= 0V, V
CC5
= V
CC3
= 3.3V
30
100
A
(from V
CC3
)
V
CC5
= Enabled
V
PP
= Disabled (Hi-Z or 0V)
R
ON
V
CC
V
CC OUT
R
ON
V
PP IN
= 0V, V
CC5
= V
CC3
= 3.3V
4.5
6
V
CC3
= Enabled
V
PP
= Disabled (Hi-Z or 0V)
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
from static discharge.
NOTE 3:
From 90% of V
OUT
to 10% of V
OUT
. R
L
= 2.1k
NOTE 6:
Suspend mode is a pseudo power-down mode the MIC2561 automatically allows when V
PP IN
= 0V, V
PP
OUT is deselected, and V
CC
OUT = 3.3V is selected. Under these conditions, the MIC2561 functions in a reduced capacity mode where V
CC
output of 3.3V is allowed,
but at lower current levels (higher switch ON resistance).
MIC2561
Micrel
2-34
1997
MIC2561-0 Control Logic Table
Pin 1
Pin 2
Pin 4
Pin 3
Pins 8 & 12
Pin 7
V
CC5_EN
V
CC3_EN
EN1
EN0
V
CC OUT
V
PP OUT
0
0
0
0
High Z
High Z
0
0
0
1
High Z
High Z
0
0
1
0
High Z
High Z
0
0
1
1
High Z
Clamped to Ground
0
1
0
0
3.3
High Z
0
1
0
1
3.3
3.3
0
1
1
0
3.3
12
0
1
1
1
3.3
Clamped to Ground
1
0
0
0
5
High Z
1
0
0
1
5
5
1
0
1
0
5
12
1
0
1
1
5
Clamped to Ground
1
1
0
0
3.3
High Z
1
1
0
1
3.3
3.3
1
1
1
0
3.3
5
1
1
1
1
3.3
Clamped to Ground
Pin 1
Pin 2
Pin 4
Pin 3
Pins 8 & 12
Pin 7
V
CC5_EN
V
CC3_EN
V
PP_PGM
V
PP_
V
CC
V
CC OUT
V
PP OUT
0
0
0
0
High Z
Clamped to Ground
0
0
0
1
High Z
High Z
0
0
1
0
High Z
High Z
0
0
1
1
High Z
High Z
0
1
0
0
5
Clamped to Ground
0
1
0
1
5
5
0
1
1
0
5
12
0
1
1
1
5
High Z
1
0
0
0
3.3
Clamped to Ground
1
0
0
1
3.3
3.3
1
0
1
0
3.3
12
1
0
1
1
3.3
High Z
1
1
0
0
High Z
Clamped to Ground
1
1
0
1
High Z
High Z
1
1
1
0
High Z
High Z
1
1
1
1
High Z
High Z
MIC2561-1 Logic (Compatible with Cirrus Logic CL-PD6710 & CL-PD6720 Controllers)
Note: other control logic patterns are available. Please contact Micrel for details.
MIC2561
Micrel
1997
2-35
2
Applications Information
PCMCIA V
CC
and V
PP
control is easily accomplished using
the MIC2561 voltage selector/switch IC. Four control bits
determine V
CC OUT
and V
PP OUT
voltage and standby/
operate mode condition. V
PP OUT
output voltages of V
CC
(3.3V or 5V), V
PP
, or a high impedance state are available.
When the V
CC
high impedance condition is selected, the
device switches into "sleep" mode and draws only nano-
amperes 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
PP OUT
to the V
CC
inputs (from
12V to 5V, for example) by locking out the low voltage switch
until V
PP OUT
drops below V
CC
. The V
CC
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
CC3
and
internal MOSFET drive is obtained from the V
PP
IN pin
(usually +12V) during normal operation. If +12V is not avail-
able, the MIC2561 automatically switches into "suspend"
mode, where V
CC OUT
can be switched to 3.3V, but at higher
switch resistance. Internal break-before-make switches de-
termine the output voltage and device mode.
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
PP
IN
inputs with filter capacitors to improve output ripple. As all
internal device logic and voltage/current comparison func-
tions are powered from the V
CC3
IN line, supply bypass of this
line is the most critical, and may be necessary in some cases.
In the most stubborn layouts, up to 0.47
F may be necessary.
Both V
CC OUT
and V
PP OUT
pins may have 0.01
F to 0.1
F
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
PP
IN pins.
PCMCIA Implementation
The Personal Computer Memory Card International Associa-
tion (PCMCIA) specification requires two V
PP
supply pins per
PCMCIA slot. V
PP
is primarily used for programming Flash
(EEPROM) memory cards. The two V
PP
supply pins may be
programmed to different voltages. Fully implementing PCM-
CIA specifications requires a MIC2561, a MIC2557 PCMCIA
V
PP
Switching Matrix, and a controller. Figure 3 shows this
full configuration, supporting both 5.0V and 3.3V V
CC
opera-
tion.
Figure 3. MIC2561 Typical PCMCIA memory card application with dual V
CC
(5.0V or 3.3V) and separate V
PP1
and V
PP2.
System
Power
Supply
PCMCIA
Card Slot
Controller
MIC2561
PCMCIA
Card Slot
5V
3.3V
12V
EN0
EN1
VPP1
VCC
VPPIN
VCC5IN
VCC3IN
VCC5_EN
VCC3_EN
VPP2
MIC2557
EN0
EN1
VPP IN VDD
VPP OUT
VCC
MIC2561
Micrel
2-36
1997
However, many cost sensitive designs (especially notebook/
palmtop computers) connect V
PP1
to V
PP2
and the MIC2557
is not required. This circuit is shown in Figure 4.
When a memory card is initially inserted, it should receive
V
CC
-- 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 V
PP
and if the card is designed for dual
V
CC
. If the card is compatible with and desires a different V
CC
level, the controller commands this change by disabling V
CC
,
waiting at least 100ms, and then re-enabling the other V
CC
voltage.
If no card is inserted or the system is in sleep mode, the
controller outputs a (V
CC3
IN, V
CC5
IN) = (0,0) to the
MIC2561, which shuts down V
CC
. This also places the switch
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
V
PP
IN 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 V
PP
IN (usually the main power
supply filter capacitor is sufficient). The V
PP OUT
transition
from V
CC
to 12.0V typically takes 15
s. After programming is
completed, the controller outputs a (EN1, EN0) = (0,1) to the
MIC2561, which then reduces V
PP OUT
to the V
CC
level for
read verification. Break-before-make switching action re-
duces switching transients and lowers maximum current
spikes through the switch from the output capacitor. The flag
comparator prevents having high voltage on the V
PP
OUT
capacitor from contaminating the V
CC
inputs, by disabling the
low voltage V
PP
switches until V
PP
OUT
drops below the V
CC
level selected. The lockout delay time varies with the load
current and the capacitor on V
PP OUT
. With a 0.1
F capacitor
and nominal I
PP OUT
, the delay is approximately 250
s.
Internal drive and bias voltage is derived from V
PP
IN. Internal
device control logic is powered from V
CC3
IN. Input logic
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-
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 oc-
curs 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
PP
IN supply. In Suspend Mode, the MIC2561 supplies 3.3V to
V
CC
OUT whenever a V
CC
output of 3.3V is enabled by the
PCMCIA controller. This mode allows the system designer
the ability to turn OFF the V
PP
supply generator to save
power when it is not specifically required. The PCMCIA card
receives V
CC
at reduced capacity during Suspend Mode, as
the switch resistance rises to approximately 4.5
.
High Current V
CC
Operation Without a
+12V Supply
Figure 5 shows the MIC2561 with V
CC
switch bias provided
by a simple charge pump. This enables the system designer
to achieve full V
CC
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
System
Power
Supply
PCMCIA
Card Slot
Controller
MIC2561
PCMCIA
Card Slot
5V
3.3V
12V
EN0
EN1
VPP1
VCC
VPPIN
VCC5IN
VCC3IN
VCC5_EN
VCC3_EN
VPP2
Figure 4. MIC2561 Typical PCMCIA memory card application with dual V
CC
(5.0V or 3.3V). Note that V
PP1
and V
PP2
are
driven together.
MIC2561
Micrel
1997
2-37
2
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 100
A when enabled. When V
PP OUT
= 12V is selected, however, the on-demand V
PP
generator
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.
0.01F
4.7k
1N914
1N914
0.1F
0.02F
Switched VPP IN
(Optional Schottky)
+5V
Drive Enable
7
6
5
4
3
2
11
10
12
13
14
8
9
Figure 5. Circuit for generating bias drive for the VCC switches when +12V is not readily available.
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