ISL9201应用电路图

  ISL9201 pdf datasheet
  Pin Description
  VIN (Pin 1)
  VIN is the input power source. Connect to a wall adapter.
  GND (Pin 2)
  GND is the connection to system ground.
  STATUS (Pin 3)
  STATUS is an open-drain output indicating charging and
  inhibit states. The STATUS pin is pulled LOW when the
  charger is charging a battery. It will be turned into high
  impedance when the charge current drops to IMIN. This high
  impedance state will be latched until a recharge cycle or a
  new charge cycle starts. When the charger is disabled, the
  STATUS pin outputs high impedance.
  TIME (Pin 4)
  The TIME pin determines the oscillation period by
  connecting a timing capacitor between this pin and GND.
  The oscillator also provides a time reference for the charger.
  GND (Pin 5)
  GND is the connection to system ground.
  EN (Pin 6)
  EN is the enable logic input. Connect the EN pin to HIGH to
  disable the charger. Connect the EN pin to LOW or leave it
  floating to enable the charger. There is an internal 400kΩ
  pull-down resistor at this pin.
  V2P8 (Pin 7)
  This is a 2.8V reference voltage output. This pin provides a
  2.8V voltage source when the input voltage is above the
  POR threshold and outputs 0V otherwise. The V2P8 pin can
  be used as an indication for adapter presence.
  IREF (Pin 8)
  This is the charge current programming and monitoring pin.
  Connect a resistor between this pin and GND to set the
  charge current during the constant current phase, as given
  by Equation 1:
  Where RIREF is in kΩ.
  VSEN (Pin 9)
  VSEN is the remote voltage sense pin. Connect this pin as
  close to the battery positive terminal as possible. If the
  VSEN pin is left floating, its voltage drops to 0V and the
  charger operates in trickle mode.
  VBAT (Pin 10)
  VBAT is the connection to the battery. Typically a 10μF
  Tantalum capacitor is needed for stability when there is no
  battery attached. When a battery is attached, only a 0.1μF
  ceramic capacitor is required.