AS1359-BTTT-31 austriamicrosystems, AS1359-BTTT-31 Datasheet - Page 10

• Manufacturer Part Number: AS1359-BTTT-31
• Description: IC REG LDO 300MA 3.1V TSOT23-5
• Manufacturer: austriamicrosystems

Specifications of AS1359-BTTT-31

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.1V
• Voltage - Input: Up to 5.5V
• Voltage - Dropout (typical): 0.14V @ 300mA
• Number Of Regulators: 1
• Current - Output: 300mA (Min)
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5 Thin, TSOT-23-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Other names: AS1359-BTTT-31TR

AS1358/AS1359
Datasheet - D e t a i l e d D e s c r i p t i o n
Current Limit
The AS1358/AS1359 include a current limiting circuitry to monitor and control the P-channel MOSFET pass transis-
tor’s gate voltage, thus limiting the device output current to 270mA (AS1358) and 510mA (AS1359).
Note: See
Thermal Protection
Integrated thermal protection circuitry limits total power dissipation in the AS1358/AS1359. When the junction temper-
ature (T
transistor and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the
device’s junction temperature drops by 10ºC, resulting in a pulsed output during continuous thermal-overload condi-
tions.
Note: Thermal protection is designed to protect the devices in the event of fault conditions. For continuous operation,
Operating Region and Power Dissipation
The AS1358/AS1359 maximum power dissipation is dependant on the thermal resistance of the case and PCB, the
temperature difference between the die junction and T
Power dissipation across the device is calculated as:
The maximum power dissipation is calculated:
Where:
T
θ
θ
Note: Pin GND of the AS1358/AS1359 provides the electrical connection to system ground and also serves as a heat
Noise Reduction
The AS1358/AS1359 noise bypass circuitry dramatically reduces output noise, exhibiting 9µVRMS of output voltage
noise with C
OUT
Note: Startup time is minimized by internal power-on circuitry which pre-charges C
www.austriamicrosystems.com
JC
CA
J
- T
is the thermal resistance of the package;
is the thermal resistance through the PC board/copper traces/other materials to the surrounding air.
(see Figure 1 on page
AMB
indefinitely without causing damage to the device.
J
do not exceed the absolute maximum junction temperature rating of +150ºC.
sink. Connect pin GND to the system ground using a large pad or ground plane.
) exceeds +160ºC, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass
is the temperature difference between the AS1358/AS1359 die junction and the surrounding air;
BYPASS
Table 4 on page 4
= 0.01µF and C
1).
for the recommended min and max current limits. The output can be shorted to ground
OUT
PDMAX = (T
= 1µF. Use an external 0.01µF bypass capacitor between pin BYPASS and pin
PD = I
OUT
J
Revision 1.04
- T
AMB
(V
AMB
IN
, and airflow rate.
- V
)/(
θ
OUT
JC
+
)
θ
CA
)
BYPASS
.
10 - 14
(EQ 1)
(EQ 2)