MAX1534ETE+T Maxim Integrated Products, MAX1534ETE+T Datasheet - Page 11

• Manufacturer Part Number: MAX1534ETE+T
• Description: IC PWR SUPPLY CONTROLLER 16TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1534ETE+T

• Applications: Power Supply Controller
• Voltage - Input: 4.5 ~ 24 V
• Current - Supply: 15µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Figure 2. MAX1534 Functional Block Diagram
down, the supply current drops to 3.5µA, maximizing
battery life. The internal P-channel MOSFET in the buck
converter and linear regulators turn off to isolate each
input from its output. The output capacitance and load
current determine the rate at which the output voltage
decays. For automatic shutdown and startup, connect
SHDN to IN. Connect SHDN to IN through a resistive
voltage-divider to implement a programmable under-
voltage lockout. Do not leave SHDN floating.
The open-drain POK output is useful as a simple error
flag, as well as a delayed reset output. POK sinks cur-
rent when any of the three regulated output voltages is
11% below its regulation point. Connect POK to OUT_
through a high-value resistor for a simple error flag indi-
High-Efficiency, Triple-Output, Keep-Alive
0.01 µ F
______________________________________________________________________________________
Power Supply for Notebook Computers
BP
GND
SHDN
POK
OUT1
FB1
1V
1V
REF
MAX1534
Power-OK (POK)
VL
DRIVER
PMOS
STARTUP
TSDN
PRESET
OUT3_OK
OUT2_OK
OUT1_OK
PRESET
REG
VL
ENABLE
0.9V
OUT2_OK
1V
LDOIN
IN
LDOIN
0.9V
DRIVER
PMOS
OUT1_OK
cator. Connect a capacitor from POK to GND to pro-
duce a delayed POK signal (delay set by the RC time
constant). POK is low in shutdown and is high imped-
ance when all three outputs are in regulation.
Thermal-overload protection limits total power dissipation
in the MAX1534. When the junction temperature exceeds
T
tor, allowing the IC to cool. The thermal sensor turns the
IC on again after the IC’s junction temperature cools by
15°C, resulting in a pulsed output during continuous
thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX1534 in the event of fault conditions. For continu-
J
0.9V
1V
= +160°C, a thermal sensor turns off the pass transis-
IPEAK
PRESET PRESET
VL
PRESET
ZX
1V
DRIVER
PMOS
VL
Thermal-Overload Protection
PRESET
LDOIN
OUT2
FB3
FB2
LX
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