ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet - Page 12

• Manufacturer Part Number: ltc3869gn-2
• Description: Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers
• Manufacturer: Linear Technology Corporation

OPERATION
LTC3869/LTC3869-2
A phase-locked loop (PLL) is integrated on the LTC3869
to synchronize the internal oscillator to an external clock
source that is connected to the MODE/PLLIN pin. The
controller is operating in forced continuous mode when
it is synchronized.
The PLL loop filter network is integrated inside the LTC3869.
The phase-locked loop is capable of locking any frequency
within the range of 250kHz to 770kHz. The frequency setting
resistor should always be present to set the controller’s initial
switching frequency before locking to the external clock.
Power Good (PGOOD Pin)
When V
reference voltage, the PGOOD pin is pulled low. The
PGOOD pin is also pulled low when the RUN pin is below
12
FB
pin voltage is not within ±10% of the 0.6V
1.2V or when the LTC3869 is in the soft-start or tracking
phase. The PGOOD pin will flag power good immediately
when both V
window. However, there is an internal 20µs power bad
mask when V
pin is allowed to be pulled up by an external resistor to a
source of up to 6V.
Output Overvoltage Protection
An overvoltage comparator, OV, guards against transient
overshoots (>10%) as well as other more serious condi-
tions that may overvoltage the output. In such cases, the
top MOSFET is turned off and the bottom MOSFET is turned
on until the overvoltage condition is cleared.
FB
FB
pins are within the ±10% of the reference
goes out the ±10% window. The PGOOD
3869f