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PDF ( 数据手册 , 数据表 ) SMB118

零件编号 SMB118
描述 Six-Channel Programmable DC-DC Power Managers
制造商 Summit
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SMB118 数据手册, 描述, 功能
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 pdf, 数据表
PLEASE NOTE: The SMB118 has entered End-of-Life.
SMB118/218
PIN DESCRIPTIONS (CONT.)
Pin
Number
Pin Name
Pin
Type
Pin Description
25
SMB118:
nRESET
SMB218:
VDD_CAP
Output
Power
SMB118: Reset Output. Releases with programmable delay after all selected
outputs are valid (see UV/OV trip points). Open-drain active low output.
SMB218: VDD Bypass – Connect to VDD bypass capacitor with 10uF capacitor.
SMB118:
VDD_CAP
Power
SMB118: VDD Bypass – Connect to VDD bypass capacitor with 10uF capacitor.
26
SMB218:
VDDP
Power
SMB218: Power Input for the Boost Converter. Connect to +2.7V to +6.0V
voltage source. Must be at same voltage as source of PFET for the Boost
converter.
27
VBATT
Power
Power Input for Controller. Connect to +2.7V to +6.0V voltage source Bypass
with a 0.1uF ceramic capacitor close to the pin
28
DRVL1
Output Boost converter 1 low-side drive – Connect to NFET gate
29 FB1 Input Boost converter 1 feedback pin – Connect to external resistor divider
30
CSH1
Input
Boost converter 1 current sense high – Connect to high side of sense resistor.
This input is used to Kelvin sense the voltage across the current sense resistor.
31 CSL1
32 COMP1
33 PCHSEQ1
34 BFETDRV
35 BSENSE
36 TSENSE
37 BCSH
38 LDOIN2
39 LDOOUT2
40 SW4
41 VIN4
42 DRVL4
43 BCSL
44 FB4
45 COMP4
46 SHDN
47
48
PAD (49)
SDA
SCL
DRVGND
Summit Microelectronics, Inc
Input
Input
Output
Output
Input
Input
Input
Power
Input/
Output
Input/
Output
Power
Output
Input
Input
Input
Input
Input/
Output
Input
Ground
Boost converter 1 current sense low – Connect to low side of sense resistor.
This input is used to Kelvin sense the voltage across the current sense resistor.
Boost converter 1 compensation pin – Connect to R/C compensation network
P-Channel MOSFET sequencing pin. Connect to PFET gate for Boost channel
on/off and sequencing. Internally connected to a 100uA current sink to pull PFET
gate resistor from VDD to GND to enable sequencing. Tie to GND when unused.
Battery Charger FET Drive – Connects to gate of a PFET to control battery
charging current
Battery Voltage Sense – Connect directly to positive terminal of battery
Battery Temperature Sense – Connect to “Temp” terminal of battery pack. This
pin injects a programmable current into the NTC thermistor internal to the battery
pack and measures the resulting current to detect temperatures. Place a 24.9K
resistor, for 10K NTC, from this node to ground.
Charge Current Sense – Connect to high-side of charge current sense resistor.
This input is used to Kelvin sense the voltage across the current sense resistor.
LDO Power Input – Connect to +2.7V to +6.0V to supply internal LDO
LDO Output/Feedback
Buck converter 4 switch pin – Connect to drains of NFET
Buck Converter 4 Power – Connect to +2.7V to +6.0V to supply internal PFET
Buck converter 4 low-side drive – Connect to NFET gate
Charge Current Sense resistor. Connect to low side of charge current sense
resistor. Do not attach to battery node at any other point.
Buck converter 4 feedback pin – Connect directly to output
Buck converter 4 compensation pin – Connect to R/C compensation network
Shutdown – When high this input disables all functions of the SMB118 for low
power operation. When voltage is present on the DOCK_DC input the part will
exit the shutdown state, regardless of the state of the shutdown input.
I2C Data
I2C Clock
Power Ground – Internally connect to under package pad. Connect to isolated
PCB ground plane/flood
2107 3.0 10/15/2008
8







SMB118 equivalent, schematic
PLEASE NOTE: The SMB118 has entered End-of-Life.
SMB118/218
AC OPERATING CHARACTERISTICS (CONTINUED)
(Over commercial operating conditions, unless otherwise noted. All voltages are relative to GND.)
Symbol
Parameter
Notes
Min Typ Max
400
200
100
SRREF
Programmable slew rate
reference
Adjustable slew rate factor
proportional to output slew rate.
66.7
50
33.3
25
20
Unit
V/s
Summit Microelectronics, Inc
2107 3.0 10/15/2008
16










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