PM6680A Product
Page
| The PM6680A is a dual step-down controller,
which represents the best integrated solution for providing the
two main output voltages necessary for the FPGA and MCU system power.
By using a lossless current sensing technique it has an extremely
high efficiency conversion, up to 95%. The PM6680A is the first
of a new product family that will support power management applications
in the industrial environment. |
|
| PM6680A Functional Description |
The device provides two switching controllers with adjustable outputs
and a 5V LDO capable of supplying 200mA peak current. The PM6680A can
guarantee high DC output accuracy over a wide input voltage range, covering
the 5V, 12V and 24V bus. Thanks to the Constant ON Time (COT) architecture,
the PM6680A is able to convert the 36V input voltage to an output voltage
in the range of 1.2V to 2.5V. This range covers the typical core, I/O
and memory voltages required by embedded systems based on FPGA and MCU.
For portable equipment the efficiency and battery life can be further
increased by an internal p-channel Power MOSFET that disables the LDO
5V output and the IC is supplied directly by the external 5V bus. An embedded
integrator control loop compensates the DC voltage error due to the output
ripple. In light load conditions, a pulse-skip technique can be selected
to increase the efficiency with minimum impact on the output regulation
accuracy. During pulse-skip mode, a minimum switching frequency of 33kHz
is selectable to prevent audio noise issues.
| Industrial Power Management Solutions |
Another key benefit of the PM6680A is a selectable switching frequency,
allowing either 200/300kHz,
300/400kHz or 400/500kHz operation of the Ctrl1/Ctrl2 switching sections.
Main internal blocks of PM6680A
| P
/ N |
#
of
out |
Main
application |
Regulated
switching |
Regulated
LDO |
LDO
current |
IC
supply
voltage |
Output
acc. |
Switch.
freq. |
Package |
| PM6680A |
3 |
Embedded
systems |
Adj
from 0.9V |
Fixed 5V |
200mA pk |
5.5V
to 36V |
+1% |
200kHz
to
500kHz |
VFQFPN
32 pin 5X5 |
| PM6681A |
4 |
Adj from
0.9
and fixed 5V |
100mA pk |
200kHz
to
750kHz |
| PM6675A |
3 |
Adj from
0.6V |
Adj from
0.6V |
2A pk |
200kHz
to
1MHz |
VFQFPN
24 pin 4X4 |
 Constant
ON Time topology
No RSENSE
current sensing with low side Power MOSFET’s RDS(on)
Soft START
internally fixed at 2ms
Soft OFF
for a controlled output discharge
Selectable
minimum frequency (33kHz) in pulseskip mode
5mW maximum
quiescent power
Independent
power good signals
Output
voltage ripple compensation
Thermal
shutdown
Housed
in space-saving, 32pin VFQFPN 5x5
Embedded
computer systems
FPGA and
MCU-based systems
Industrial
applications
High performance
and high density DC/DC module
|
