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SMB208A датащи(PDF) 2 Page - Summit Microelectronics, Inc.

номер детали SMB208A
подробное описание детали  Dual Programmable Buck Regulators with Integrated MOSFETs and Digital Control
Download  27 Pages
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производитель  SUMMIT [Summit Microelectronics, Inc.]
домашняя страница  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMB208A датащи(HTML) 2 Page - Summit Microelectronics, Inc.

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SMB206A/7A/8A
Preliminary
SUMMIT Microelectronics, Inc.
2147 2.4 2/23/2012
2
DIGITAL INTERFACE/NON-VOLATILE
PROGRAMMING
The built-in serial digital I
2C/SMBus compatible port and
built-in non-volatile programming bring several benefits
to power supply design with the SMB206A/7A/8A. Many
external
components
are
eliminated
that
would
otherwise be used to set configuration and parametric
values. Additionally, the digital interface allows for quick
and easy development and debug without hardware
changes.
Finally,
after
the
non-volatile
power-up
configuration, the serial port can be used to re-program
the SMB206A/7A/8A by host software after the system is
running. For quick programming development and debug
use Summit’s prebuilt evaluation kit including a PC-
based graphical user interface (GUI).
DUAL PWM DC-DC REGULATORS
The SMB206A/7A/8A contains two integrated PWM DC-
DC step-down (buck) regulator(s) with identical features
and functions. The input voltage range is +4.5V to +16V
to support a wide variety of system applications. The
outputs support a full 1A-3A continuous output current
with a built-in cycle-by-cycle current limit. The output
voltage
range
is
+0.8V
and
+5.0V
and
fully
programmable
in
non-volatile
(static)
or
volatile
(dynamic, on-the-fly) via the serial digital interface. The
nominal “coarse” (100mV steps) voltage programming
provides flexibility for various types of loads without
hardware changes. In the SMB206A/7A/8A the “fine”
programming
provides
“margining”
capability
for
sophisticated system validation and optimization.
Built-in high-side MOSFETs work in conjunction with
external Schottky diode rectifiers in constant frequency
PWM-mode at high load currents or high efficiency pulse
skipping PFM-mode at light loads. Switching frequency
is
programmable
(500kHz/1000kHz)
to
trade
off
efficiency and component size.
Each output switches
180
o out of phase with the other to reduce input ripple
current,
switching
noise
and
input
capacitance
requirement. Bootstrapped high-side drive improves
efficiency and extends the operating voltage range.
Frequency compensation is fully integrated to further
reduce component count and cost.
POWER CONTROL/MANAGEMENT FUNCTIONS
The
SMB206A/7A/8A
integrates
several
power
management functions that are typically otherwise
performed by external circuits. These include output
sequencing with programmable timing, hardware or
software-based
output
enable/disable,
and
programmable softstart timing. Also, the output voltages
are monitored with a programmable PGOOD/RESET
output (PGOOD asserts immediately, RESET delays
125ms). Software Enable bits and hardware Enable pins
work together to provide flexible power up/down and
manual/auto sequencing.
The
SMB206A/7A/8A
also
supports
digitally
programmable dynamic output voltage. The non-volatile
setting determines the power-up/static value but it can
be re-programmed by software via the serial interface.
The settings are +0.8V to +5.0V and can support
dynamic voltage/clock CPU cores or low power memory
modes.
GENERAL DESCRIPTION


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