FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
DUTY CONTROL PINS (DMAX1, DMAX2)
REGULATOR CONTROL PINS (SREGC1, SREGC2,
SREGC3)
Connected external voltage to this pin via capacitance can
control the duty of DC/DC converter switching. Use of the pin
for this is not recommended.
Feed back pin for each series regulators. This pin voltage
is compared with internal reference voltage. Input the feed
back voltage that divided SREGO voltage by resistances.
REFERENCE FEEDBACK PINS (EAOUT1, EAOUT2)
REGULATOR OUTPUT PINS (SREGO1, SREGO2,
SREGO3)
Output node of internal error amp. for DC/DC converter 1
and 2. Used for phase compensation.
Series regulator output pins. All output voltages can be
variable with internal DAC via serial I/F.
INPUT MINUS PINS (EAIN1, EAIN2)
Minus input of internal error amp. for DC/DC converter 1
and 2. Used for phase compensation.
REGULATOR INPUT PINS (SREGI1, SREGI2,
SREGI3)
CHARGE PUMP CAPACITOR PIN (CH_PUMP)
Series regulator power input pins. To be connected to
battery voltage in general.
In case of use higher voltage than VGATE externally,
connect capacitance and diodes between VGATE. The
charge pump structure can output VGATE + VB - 2 x VF
voltage. There is no meaning for Ni-MH or dry cell battery,
because the VB voltage is almost same as 2 x VF voltage.
Recommend to use for Li-Ion battery use.
GROUND PIN (GND)
Ground pin for logic and analog circuit portion (not power
portion). Recommend to connect to clean ground which
separated with power ground line.
GATE VOLTAGE PIN (VGATE)
REFERENCE VOLTAGE PIN (VREF)
Output pin of boost converter for gate drive voltage. The
output voltage is decided by VGSEL input.
Output of internal reference voltage. It can be used
externally. Output current capacity is less than 300 µA.
SWITCHING FOR GATE VOLTAGE PIN (SWGATE)
DATA INPUT PIN (DATA)
Switching pin for VGATE boost converter. Connect to
external inductance.
Serial data input pin for the serial interface. The last 12 bits
received before the strobe signal’s low to high transition are
latched.
BATTERY VOLTAGE PIN (VBATT)
Power supply input that connects to Ni-MH or Dry cell or
Li-Ion battery.
STROBE PIN (STRB)
Strobe signal input pin for serial interface. It latches the 12
bits of data input to the internal control registers.
VGATE SELECT PINS (VGATESEL1, VGATESEL2)
VGATE output voltage is decided with these two bits input.
SERIAL CLOCK PIN (SCKIN)
Clock input pin for serial interface. Input data are taken in
to I/F with this clock.
VOLTAGE INPUT FOR POWER SWITCH 2 PIN
(VO2_SENSE_IN)
WATCH DOG TIMER PIN (WATCHDOG)
Input of VOUT2 output via power switch. Connect to
VO2_SENSE pin externally.
Watch dog timer prevent unstable wake up (flips between
wake-up and failure). If there is no ‘CLEAR’ input after any
WAKEnB input before this WATCHDOG is expired, this
device moves to ‘SLEEP’ mode to prevent wake failure
hanging-up situation.
STEP DOWN FET GATE DRIVE PINS (HG, LG)
Gate drive output pins for external FETs to use DC/DC
converter 2 as Buck / Boost converter.
SEQUENCE SELECT PIN (SEQ_SELECT)
GATE SWITCH PIN (VGATE_EXT)
Select judgement Reset channel for wake-up complete
with this input. If this input level is V_STDBY voltage, this
device judges the wake-up completion with Reset2 (DC/
DC2). If it is Ground, judge with Reset1 (DC/DC1). See
Table 7, on page 13.
Gate drive output pin for external low side switch. It can be
used for power switch turning On/OFF for remote controller
part.
18730
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
FREESCALE [ Freescale ]
