SMB118 Просмотр технического описания (PDF) - Summit Microelectronics
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SMB118 Datasheet PDF : 37 Pages
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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
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