MAX1589AETT150+T Maxim Integrated Products, MAX1589AETT150+T Datasheet - Page 7

• Manufacturer Part Number: MAX1589AETT150+T
• Description: IC REG LDO 1.5V 500MA 6TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1589AETT150+T

• Regulator Topology: Positive Fixed
• Voltage - Output: 1.5V
• Voltage - Input: 1.62 ~ 3.6 V
• Number Of Regulators: 1
• Current - Output: 500mA (Min)
• Current - Limit (min): 550mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Dropout (typical): -
• Lead Free Status / Rohs Status: Details

Figure 1. Functional Diagram
transistor, allowing the IC to cool. The thermal sensor
turns the pass transistor on again after the junction tem-
perature cools by 15°C, resulting in a pulsed output
during continuous thermal-overload conditions. Thermal-
overload protection safeguards the MAX1589A in the
event of fault conditions. For continuous operation, do not
exceed the absolute maximum junction-temperature
rating of +150°C.
The MAX1589A’s maximum power dissipation depends
on the thermal resistance of the IC package and circuit
board, the temperature difference between the die
junction and ambient air, and the rate of airflow. The
power dissipated in the device is P = I
V
where T
the MAX1589A die junction and the surrounding air, θ
is the thermal resistance of the junction to the case, and
θ
PC board, copper traces, and other materials to the sur-
rounding air. Typical thermal resistance (θ
device mounted to a 1in square, 1oz copper pad is
CA
OUT
Operating Region and Power Dissipation
is the thermal resistance from the case through the
). The maximum allowed power dissipation is:
SHDN
J(MAX)
GND
IN
P
MAX
- T
Low-Input-Voltage, 500mA LDO Regulator
= (T
A
MAX1589A
_______________________________________________________________________________________
is the temperature difference between
J(MAX)
- T
SHUTDOWN
A
THERMAL
SENSOR
LOGIC
) / (θ
JC
+ θ
JC
CA
OUT
+ θ
REF
)
with R R E E S S E E T T in SOT and TDFN
✕
JA
(V
) for a
IN
JC
-
82.5%
REF
41°C/W for the 3mm x 3mm TDFN package, and
110°C/W for the 6-pin thin SOT23 package. For best
heatsinking, expand the copper connected to GND, or
the exposed paddle.
The MAX1589A delivers up to 500mA and operates
with an input voltage up to +3.6V. However, when using
the 6-pin SOT23 version, high output currents can only
be sustained when the input-output differential voltage
is low, as shown in Figure 2.
The maximum allowed power dissipation for the 6-pin
TDFN is 1.951W at T
maximum input-output differential voltage is not limited
by the TDFN package power rating.
Capacitors are required at the MAX1589A’s input and
output for stable operation over the full temperature
range and with load currents up to 500mA. Connect a
1µF ceramic capacitor between IN and GND and a
4.7µF low-ESR ceramic capacitor between OUT and
GND. The input capacitor (C
impedance of the input supply. Use larger output
ERROR
AMP
POWER-GOOD
COMPARATOR
Applications Information
100ms
TIMER
MOS DRIVER
WITH I
A
LIMIT
= +70°C. Figure 3 shows that the
Capacitor Selection and
Regulator Stability
IN
) lowers the source
P
OUT
RESET
7