MAX1977EEI+ Maxim Integrated Products, MAX1977EEI+ Datasheet - Page 17

• Manufacturer Part Number: MAX1977EEI+
• Description: IC CNTRLR PS QUAD HI EFF 28QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1977EEI+

• Applications: Controller, Notebook Computers
• Voltage - Input: 4.5 ~ 24 V
• Number Of Outputs: 4
• Voltage - Output: 3.3V, 5V, 2 ~ 5.5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-QSOP
• Output Voltage: 3.3 V, 2 V to 5.5 V
• Input Voltage: 6 V to 24 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Case: SSOP
• Dc: 06+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
MAX1777/MAX1977/MAX1999 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 (MAX1999)
REF
ILIM_
CS_ (MAX1777/1977)
LX_ (MAX1999)
SKIP
OUT_
FB_
0.15V
PRO
TRIG
0.7
ONE SHOT
COMPUTE
ON-TIME
✕
V
0.9
1.1
t
REF
ON
V+
✕
✕
V
V
Q
REF
REF
AMPLIFIER
ERROR
CURRENT
LIMIT
Σ
CROSSING
controls the power-up timing of the main PWMs and moni-
tors the outputs for undervoltage faults. The
MAX1777/MAX1977/MAX1999 include 5V and 3.3V linear
regulators. Bias generator blocks include the 5V (LDO5)
linear regulator, 2V precision reference, and automatic
bootstrap switchover circuit.
ZERO
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