SMB218 View Datasheet(PDF) - Summit Microelectronics
Part Name
Description
Manufacturer
SMB218 Datasheet PDF : 37 Pages
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PLEASE NOTE: The SMB118 has entered End-of-Life.
SMB118/218
PIN DESCRIPTIONS
Pin # Pin Name
Pin
Type
1
nALERT
Output
2
PWR_EN
Input
3
DRVL3
4
DRVH3
5
VIN3
6
COMPA3
7
PCHSEQ3
Output
Output
Power
Input
Output
8
COMPB3
Input
9
HEALTHY
Output
10 POWER_FAIL Output
11 COMP5
12 FB5
13 SW5
14 VIN5
15 DRVL5
16 DRVL6
17 VIN6
18 SW6
19 FB6
20 COMP6
Input
Input
Input/O
utput
Power
Output
Output
Power
Input/
Output
Input
Input
21 DCIN
Output
22 BSTAT
Output
23 DOCK_DC
Power
24
SMB118:
nBATT_FAULT
Output
SMB218:
nRESET
Output
Pin Description
Fault Interrupt – Latched, open-drain active low output. Flag for all fault
conditions (multiplexed)
Enable input. PWR_EN is programmable to activate one or more channels. This
pin can be programmed to latch and act as a debounced, manual push button
input. Active high when level triggered, active low when used as a push- button
input. A Software power-off command overrides this pin.
Buck or Boost converter low-side drive – connect to NFET gate
Buck converter high-side drive – connect to PFET gate (for Buck only)
Channel 3 controller power – Connect to +2.7V to +6.0V to supply internal FET
drivers
Buck or Boost Primary Compensation – Connect to R/C compensation network
Boost converter 3 sequence – connect to PFET gate for Boost channel on/off
and sequencing. Must be tied to ground when unused.
Buck or Boost Secondary Compensation – Connect to R/C compensation
network
Output Monitor – Open drain active-high output asserts when all output channels
are within UV/OV limits (ignoring disabled outputs)
Battery/Input Monitor. Detects low input voltage. Latched open-drain active high
output. Associated threshold must be set higher than nBATT_FAULT threshold.
Buck converter 5 compensation pin – Connect to R/C compensation network
Buck converter 5 feedback pin – Connect directly to output
Buck converter 5 switch pin – Connect to drains of NFET
Buck Converter 5 Power – Connect to +2.7V to +6.0V to supply internal PFET
Buck converter 5 low-side drive – Connect to NFET gate
Buck converter 6 low-side drive – Connect to NFET gate
Buck Converter 6 Power – Connect to +2.7V to +6.0V to supply internal PFET
Buck converter 6 switch pin – Connect to drains of NFET
Buck converter 6 feedback pin – Connect directly to output
Buck converter 6 compensation pin – Connect to R/C compensation network
DC Input Valid – Active high open drain indicates presence of DC input voltage
(docking) with programmable threshold
Battery Charger Status Output – Open Drain output asserts low when battery is
charging and releases when charging is terminated/interrupted. Can be
configured to blink while charging. When configured to blink, it will blink once
every second while pre-charging and twice per second while fast and taper
charging.
Docking Connector Detector. DOCK_DC detects presence of external DC input
and asserts DCIN pin. Provides power to the chip when greater than VBATT.
Voltage on this pin must be greater than DOCK_DC trip point (programmable)
for battery charging to be initiated. When voltage is present on DOCK_DC pin
the SHDN pin is bypassed.
SMB118: Battery/Input Monitor. nBATT_FAULT detects low input voltage. Open-
drain active low output. Associated threshold must be set lower than
POWER_FAIL threshold.
SMB218: Reset Output. Releases with programmable delay after all selected
outputs are valid (see UV/OV trip points). Open-drain active low output.
Summit Microelectronics, Inc
2107 3.0 10/15/2008
7
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