SMB207A datasheet(2/27 Pages) SUMMIT

2 / 27 page

SMB206A/7A/8A

Preliminary

SUMMIT Microelectronics, Inc.

2147 2.4 2/23/2012

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

+0.8V

and

+5.0V

and

fully

programmable

non-volatile

(static)

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

programmable

(500kHz/1000kHz)

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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