MAX1533AETJ+ Maxim Integrated Products, MAX1533AETJ+ Datasheet - Page 25

• Manufacturer Part Number: MAX1533AETJ+
• Description: IC POWER SUPPLY CONTROLER 32TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1533AETJ+

• Applications: Power Supply Controller
• Voltage - Input: 4.5 ~ 26 V
• Current - Supply: 15µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 6. Optional Gate-Driver Circuitry
Figure 7. Power-Good and Fault Protection
High-Efficiency, 5x Output, Main Power-Supply
(R
THE SWITCHING-NODE RISE TIME.
(C
COUPLING THAT CAN CAUSE SHOOT-THROUGH CURRENTS.
MAX1533A
MAX1537A
BST
NL
)* OPTIONAL—THE CAPACITOR REDUCES LX TO DL CAPACITIVE
)* OPTIONAL—THE RESISTOR LOWERS EMI BY DECREASING
LDO5
LDO5
GND
BST
DH
LX
DL
______________________________________________________________________________________
POWER-GOOD
INT REF_
(R
0.9 x
BST
(C
C
BST
NL
)*
)*
Controllers for Notebook Computers
D
C
BST
BYP
N
N
H
L
INPUT (V
TIMER
L
POR
IN
)
INT REF_
0.7 x
PROTECTION
FAULT
PGOOD is the open-drain output of a comparator that
continuously monitors both SMPS output voltages for
undervoltage conditions. PGOOD is actively held low in
shutdown (SHDN or ON3 or ON5 = GND), soft-start,
and soft-shutdown. Once the digital soft-start termi-
nates, PGOOD becomes high impedance as long as
both outputs are above 90% of the nominal regulation
voltage set by FB_. PGOOD goes low once either
SMPS output drops 10% below its nominal regulation
point, an output overvoltage fault occurs, or either
SMPS controller is shut down. For a logic-level PGOOD
output voltage, connect an external pullup resistor
between PGOOD and V
works well in most applications.
PGOOD is independent of the fault protection states
OVP and UVP.
If the output voltage of either SMPS rises above 111%
of its nominal regulation voltage and the OVP protection
is enabled (OVP = GND), the controller sets the fault
latch, pulls PGOOD low, shuts down both SMPS con-
trollers, and immediately pulls DH_ low and forces DL_
INT REF_
1.11 x
LATCH
FAULT
Output Overvoltage Protection (OVP)
Power-Good Output (PGOOD)
INTERNAL FB
ENABLE OVP
ENABLE UVP
BLANK
(POWER-UP)
FAULT
POWER-
GOOD
CC
. A 100kΩ pullup resistor
Fault Protection
25