LTC3802_15 Datasheet, PDF (11/28 Pages) Linear Technology – Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking

BLOCK DIAGRA
PLLIN
PLLLPF
PHASEMD
TO CH2
PLL AND OSC
–
PWM
+
V_INFF
COMP1, 2
LINE
FEEDFORWARD
COMPENSATION
LTC3802
CHANNEL 1
SUBCIRCUIT
V_CC
FCB
DUPLICATE FOR
SECOND CONTROLLER
CHANNEL
DISABLE Burst Mode
OPERATION
STOP TOP GATE
LOGIC
BURST
÷ 100
– ^ILIM +
÷5
–1
10µA
BOOST1, 2
TG1, 2
SW1, 2
PV_CC
BG1, 2
PGND
SGND
I_MAX1,2
EXTREF
(QFN PACKAGE
ONLY)
V_REF
0.6V
FB1, 2
7µA
POWER DOWN
SOFT-
START
RUN/SS
ERR
FBT
TRACK
CMPIN2
POS
RESET
V_REF + 15mV
NEG
RESET
V_REF – 12mV
MAX
V_REF + 5%
CMPIN1, 2
PGOOD
MPG
100µs
DELAY
FROM CH2 PGOOD
COMPARATORS
NPG
V_REF – 10%
V_REF + 10%
PPG
PGOOD COMPARATORS
3802 BD
3802f
11