Datasheet

UCD7242
www.ti.com SLUS962B –JANUARY 2010–REVISED AUGUST 2012
PIN FUNCTIONS (continued)
UCD7242 –BUCK POWER STAGE
QFN PIN NAME I/O FUNCTION
Synchronous Rectifier Enable input for the A-channel. High impedance digital input capable of
25 SRE-A I accepting 3.3V or 5V logic level signals used to control the synchronous rectifier switch. An appropriate
anti-cross-conduction delay is used during synchronous mode.
High impedance digital input capable of accepting 3.3V or 5 V logic level signals up to 2 MHz. A
Schmitt trigger input comparator desensitizes this pin from external noise. This pin controls the state of
the high side MOSFET and the low side MOSFET when SRE-A is high.
26 PWM -A I
PWM = high PWM = low PWM = 1.65 V
SRE = high HS = on, LS = off HS = off, LS = on HS = off, LS = off
SRE = low HS = on, LS = off HS = off, LS = off HS = off, LS = off
27, 29, 30, 32 VIN – Input Voltage to the buck power stage and driver circuit
28, 31 NC – No internal connection. It is recommended that these pins be tied to VIN.
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