BQ25015 Datasheet, PDF (16/28 Pages) Texas Instruments – SINGLE-CHIP CHARGER AND DC/DC CONVERTER IC FOR PORTABLE APPLICATIONS

bq25015
bq25017
SLUS721A – DECEMBER 2006 – REVISED MARCH 2007
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Enable
Pulling the enable pin (EN) low forces the DC-DC converter into shutdown mode, with a shutdown quiescent
current of typically 0.1 µA. In this mode the P-channel switch and N-channel rectifier are turned off, the internal
resistor feedback divider is disconnected, and the converter enters shutdown mode. If an output voltage, which
could be an external voltage source or a super capacitor, is present during shut down, the reverse leakage
current is specified under electrical characteristics. For proper operation the EN pin must be terminated and
should not be left floating.
Pulling the EN pin high starts up the DC-DC converter with the soft-start as previously described.
Undervoltage Lockout
The undervoltage lockout circuit prevents the converter from turning on the switch or rectifier MOSFET at low
input voltages or under undefined conditions.
Forced PWM Mode
The FPWM input pin allows the host system to override the power save mode by driving the FPWM pin high. In
this state, the DC-DC converter remains in the PWM mode of operation with continuous current conduction
regardless of the load conditions. Tying the FPWM pin low allows the device to enter power save mode
automatically as previously described.
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