MAX8734 Maxim Integrated Products, MAX8734 Datasheet - Page 17

• Manufacturer Part Number: MAX8734
• Description: (MAX8732 - MAX8734) Main Power-Supply Controllers
• Manufacturer: Maxim Integrated Products

www.DataSheet4U.com
Each PWM controller consists of a Dual-Mode feedback
network and multiplexer, a multi-input PWM comparator,
high-side and low-side gate drivers, and logic. The
MAX8732/MAX8733/MAX8734 contain fault-protection cir-
cuits that monitor the main PWM outputs for undervoltage
and overvoltage conditions. A power-on sequence block
Figure 4. PWM Controller (One Side Only)
Supply Controllers for Notebook Computers
High-Efficiency, Quad-Output, Main Power-
______________________________________________________________________________________
OUT
TON (MAX8734)
REF
ILIM_
CS_ (MAX8732/8733)
LX_ (MAX8734)
FB_
0.15V
SKIP
OUT_
PRO
TRIG
0.7 V
ONE SHOT
COMPUTE
ON-TIME
0.9
1.1
t
REF
ON
V+
V
V
Q
REF
REF
AMPLIFIER
ERROR
CURRENT
LIMIT
Σ
CROSSING
ZERO
controls the power-up timing of the main PWMs and moni-
tors the outputs for undervoltage faults. The
MAX8732/MAX8733/MAX8734 include 5V and 3.3V linear
regulators. Bias generator blocks include the 5V (LDO5)
linear regulator, 2V precision reference, and automatic
bootstrap switchover circuit.
OV_FAULT
UV_FAULT
BLANKING
20ms
Q
R
ONE SHOT
LATCH
FAULT
t
S
R
S
OFF
Q
TRIG
Q
TO DH_ DRIVER
TO DL_ DRIVER
PGOOD
17