MAX8744ETJ+ Maxim Integrated Products, MAX8744ETJ+ Datasheet - Page 20

• Manufacturer Part Number: MAX8744ETJ+
• Description: IC CNTRLR PWR SUP QUAD 32TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8744ETJ+

• Applications: Controller, Notebook Computers
• Voltage - Input: 6 ~ 26 V
• Number Of Outputs: 4
• Voltage - Output: 3.3V, 5V, 1 ~ 26 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Duty Cycle (max): 99 %
• Output Voltage: 3.315 V, 5.015 V, 2 V to 5.5 V
• Mounting Style: SMD/SMT
• Switching Frequency: 200 KHz, 300 KHz, 500 KHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• Topology: Boost, Flyback, Forward
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
20
Figure 3. PWM Controller Functional Diagram
within 4ms after the SMPS controllers are disabled (see
the SMPS Shutdown Waveform in the Typical Operating
Characteristics ). This slowly discharges the output
capacitance, eliminating the negative output voltages
caused by quickly discharging the output through the
inductor and low-side MOSFET. When an SMPS target
______________________________________________________________________________________
CSH_
DRVA
OUTA
CSL_
SKIP
ILIM
TRI-LEVEL
DECODE
A = 1.2
A = 1/10
0.2 x V LIMIT
ONE-SHOT
PEAK CURRENT
NEG CURRENT
PGND
CROSSING
5V SMPS ONLY
IDLE MODE
CURRENT
LIMIT
LIMIT
ZERO
0.1 x V
LIMIT
GND
voltage discharges to 0.1V, its low-side driver (DL_) is
forced high, clamping the respective SMPS output to
GND. The reference remains active to provide an accu-
rate threshold and to provide overvoltage protection.
Both SMPS controllers contain separate soft-shutdown
circuits.
SLOPE COMP
S
R
Q
R
S
Q
START/STOP
SOFT-
OSC
DL DRIVER
DH DRIVER
(SEE FIGURE 5)
FROM FB
FSEL
ON_
REF