파트넘버.co.kr SMB118 데이터시트 PDF


SMB118 반도체 회로 부품 판매점

Six-Channel Programmable DC-DC Power Managers



Summit 로고
Summit
SMB118 데이터시트, 핀배열, 회로
PLEASE NOTE: The SMB118 has entered End-of-Life.
SMB118/218
Six-Channel Programmable DC-DC Power Managers with Battery Charger
FEATURES & APPLICATIONS
INTRODUCTION
Digital programming of all major parameters via I2C interface
and non-volatile memory
o Output voltage setpoint/margining
o Sequencing & digital soft start
o Enable/Disable outputs independently
o Input/Output UV/OV voltage thresholds
o PWM/PFM mode
Six programmable regulator channels with 1.5% accuracy
o Three synchronous step-down (Buck) with
internal PFETs
o One configurable step-up (Boost) or
synchronous step-down (Buck)
o One step-up (Boost)
o One adjustable output voltage LDO
Programmable Linear Li-Ion Battery Charger
o Precharge/fast charge/termination current
o Fast Charge voltage threshold
o Float Voltage
+2.7V to +6.0V Input Range (Higher system voltages supported)
Built-in current limiting, UV/OV, and thermal protection
Highly accurate reference and output voltage
1MHz PWM frequency and power-saving automatic PFM mode
96 bytes of user configurable nonvolatile memory
Applications
Portable Media Players
Digital camcorders/still cameras
Smart PDA/Camera phones
Handheld GPS/PDA’s
TFT-LCD Displays/Monitors/TVs
SIMPLIFIED APPLICATIONS DRAWING
The SMB118 and SMB218 are highly integrated and flexible six-
channel power managers designed for use in a wide range of portable
applications. The built-in digital programmability allows system
designers to custom tailor the device to suit almost any multi-channel
power supply application from digital camcorders to mobile phones.
The SMB118 and SMB218 integrate all the essential blocks required to
implement a complete seven-channel power subsystem including three
synchronous step-down “Buck” converters, one configurable step-up
“Boost” or step-down synchronous “Buck” converter, one step-up
“Boost” converter, one linear regulator (LDO) and a fully programmable
Li-Ion battery charger. Additionally sophisticated power
control/monitoring functions required by complex systems are built-in.
These include digitally programmable output voltage setpoint, power-
up/down sequencing, enable/disable, margining and UV/OV
input/output monitoring on all channels.
The integration of features and built-in flexibility of the SMB118 and
SMB218 allows the system designer to create a “platform solution” that
can be easily modified via software without major hardware changes.
Combined with the re-programmability of the SMB118 and SMB218,
this facilitates rapid design cycles and proliferation from a base design
to futures generations of product.
The SMB118 and SMB218 are suited to battery-powered applications
with an input range of +2.7V to +6.0V and provide a very accurate
voltage regulation. Communication is accomplished via the industry
standard I2C bus. All user-programmed settings are stored in non-
volatile EEPROM of which 96 bytes may be used for general-purpose
memory applications. The commercial operating temperature range is
0C to +70C, the industrial operating range is –40C to +85C, and the
available package is a 48-pad 7mm x 7mm QFN.
+4.5V to +6.0V
DC IN
SMB118/218
Li-Ion
Charger
Step-Up
(Boost)
Channel
Li-Ion Battery
or
+2.7V to +6.0V
I2C/SMBus
Pushbutton Power
Shutdown
RESET Output
HEALTHY Output
System
Control and
Monitoring
LDO
Channel
Step-Up
(Boost) or
Step-Down
(Buck)
Channel
3 Step-
Down
(Buck)
Channels
+0.5V to +35V (Prog.)
+1.5V to +3.75V (Prog.)
+0.5V to +35V (Prog.)
+0.5V to Vin (Prog.)
+0.5V to Vin (Prog.)
+0.5V to Vin (Prog.)
LED Backlight
Drive
MCU/RTC
Memory, I/O
CPU Core
DSP/CODEC
Analog/RF
Figure 1 – Applications block diagram featuring the SMB118/218 six-channel, programmable DC/DC
converters. These integrated power supply and battery managers provide precision regulation, monitoring,
cascade sequencing, output margining and battery charging.
© SUMMIT Microelectronics, Inc. 2008
757 N. Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com/
2107 3.0 10/15/2008
1


SMB118 데이터시트, 핀배열, 회로
PLEASE NOTE: The SMB118 has entered End-of-Life.
SMB118/218
GENERAL DESCRIPTION
The SMB118 and SMB218 are fully programmable
power supply and battery managers that regulate,
sequence, monitor, and margin, an entire power
subsystem while controlling the charging of a lithium-ion
battery pack. They feature 6 voltage outputs, consisting
of: three synchronous PWM “Buck” step-down
converters, one configurable PWM “Boost or Buck”
converter, one PWM “Boost” step-up converter, one Low
Dropout (LDO) linear regulator, and a fully
programmable Li-Ion battery charger.
The SMB118 and SMB218 regulate each of the six
output channels to an accuracy of ±1.5% (typical). The
output is individually programmed and can be
reprogrammed via the I2C interface. In addition, several
sophisticated power management functions are built-in.
The SMB118 and SMB218 are capable of power-on/off
cascade sequencing where each channel can be
assigned one of six sequence positions. Supplies may
also be individually powered on/off through an I2C
command or by assertion of the enable pin. Cascade
sequencing, unlike time based sequencing, uses
feedback to ensure that each output is valid before the
next channel is enabled.
Each output voltage and the battery are monitored for
under-voltage and over-voltage conditions, using a
comparator based scheme. In the event of a fault, all
supplies may be sequenced down or immediately
disabled. Multiple output status pins are provided to
notify host processors or other supervisory circuits of
system faults.
The SMB118 and SMB218 feature an Under-voltage
Lockout (UVLO) circuit to ensure the IC will not power up
until the battery voltage has reached a safe operating
voltage. The UVLO function exhibits hysteresis, ensuring
that noise on the supply rail does not inadvertently cause
faults on the internally regulated supply.
In the event of a system fault, all monitored supplies may
trigger fault actions such as power-off, or force-shutdown
operations. Each output on the SMB118 and SMB218
may also be turned off individually at any point through
an I2C command or by a programmable enable pin.
When used in portable applications, the devices are
powered from the main system battery. This input is
continuously monitored for under-voltage conditions.
There are two under-voltage settings for this supply;
both are user programmable and have a corresponding
status pin. When the first threshold level is reached, the
POWER_FAIL pin is asserted and latched. When the
second threshold level is reached on the main supply,
the nBATT_FAULT pin is asserted.
The SMB118 and SMB218 are equipped with three
synchronous Buck outputs and one “Buck-or-Boost”
output that use a 1MHz oscillator frequency. The
feedback circuitry on each step-down channel is
simplified by an internal programmable resistor divider
(Buck-or-Boost uses external resistor divider).
The SMB118 and SMB218 are equipped with one Boost
output that uses a 1MHz oscillator, and an asynchronous
topology reducing the necessity for an additional
external MOSFET driver. This Boost output also uses an
external p-channel sequencing MOSFET to isolate load
from the battery when not needed.
A Low Dropout (LDO) linear regulator with an adjustable
1.5V to 3.75V output provides a small dropout voltage
and ripple free supply that is optimal for “always on”
microcontrollers. The LDO has a separate input supply
pin.
The SMB118 and SMB218 provide margining control
over all of its output voltages. Through an I2C command,
all outputs can be margined by up to ±10% of the
nominal output voltage. 7-level dynamic voltage
management is also available for one of the channels. In
addition, each output is slew rate limited by soft-start
circuitry that is user programmable and requires no
external capacitors.
All programmable settings on the SMB118 and SMB218
are stored in non-volatile registers and are easily
accessed and modified over an industry standard I2C
serial bus. For fastest possible production times Summit
offers an evaluation card and a Graphical User Interface
(GUI).
Summit Microelectronics, Inc
2107 3.0 10/15/2008
2




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