LTC3734 LINER [Linear Technology], LTC3734 Datasheet - Page 8

• Manufacturer Part Number: LTC3734
• Description: Single-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
LTC3734
SW (Pin 23): Switch Node Connection to Inductor. Volt-
age swing at this pin is from a Schottky diode (external)
voltage drop below ground to V
TG (Pin 24): High Current Gate Drive for Top N-Channel
MOSFETs. This is the output of a floating driver with a
voltage swing equal to PV
node voltage SW.
BOOST (Pin 25): Bootstrapped Supply to the Topside Float-
ing Driver. External capacitor is connected between the
BOOST and SW pins, and a Schottky diode is connected
between the BOOST and PV
PGOOD (Pin 26): Power Good Indicator Output. This pin
is open drain when output is within ±10% of its set point.
When output is not within the ±10% window, this pin is
pulled to ground. An internal timer watches over VID, state
transitions, overvoltage or undervoltage conditions, then
masks PGOOD from going low for 110μs.
MCH_PG (Pin 27): MCH Power Good Input. Output volt-
age remains V
of MCH_PG. This delay is only sensitive to the rising edge
of the MCH_PG logic signal.
8
U
U
BOOT
for 15 clock cycles after the assertion
U
CC
CC
superimposed on the switch
pins.
IN
.
V
feedback voltage to the internal 0.6V reference voltage.
SV
circuits are powered from this voltage source.
DPRSLPVR (Pin 30): Deeper Sleep State Input. When the
signal to this pin is high, the voltage regulator enters
deeper sleep state and its output is determined by the
parallel resistor value of RDPRSLP and RDPSLP. When
the signal is low, the voltage regulator exits deeper sleep
state.
FREQSET (Pin 31): Frequency Set Pin. Apply a DC voltage
between 0V and 5V to set the operating frequency of the
internal oscillator. This frequency is the switching fre-
quency of the controller.
PSIB (Pin 32): Power Status Indicator Input. When the
signal to this pin is high, the controller operates in fully
synchronous switching mode for fastest transient and
lowest ripple. When the signal is low, controller enters
power saving mode, providing high efficiency at light load.
Exposed Pad (Pin 33): Signal Ground. Must be soldered
to the PCB.
FB
CC
(Pin 28): Input to the error amplifier that compares the
(Pin 29): Signal Power Pin. The internal control
3734f