AS1362-BTTT-39 austriamicrosystems, AS1362-BTTT-39 Datasheet - Page 10

• Manufacturer Part Number: AS1362-BTTT-39
• Description: IC REG LDO 300MA 3.9V TSOT23-6
• Manufacturer: austriamicrosystems

Specifications of AS1362-BTTT-39

• Regulator Topology: Positive Fixed
• Voltage - Output: 3.9V
• 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: TSOT-23-6, TSOT-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -

AS1361/AS1362
Datasheet - D e t a i l e d D e s c r i p t i o n
Figure 18. AS1361/AS1362 - Block Diagram
Power-OK
The power-ok circuitry is built around an N-channel MOSFET. The circuitry monitors the output voltage and if the volt-
age goes out of regulation (e.g. during dropout, current limit, or thermal shutdown) pin POK goes low.
The power-OK feature is not active during shutdown and provides a power-on-reset (POR) function that can operate
down to V
To obtain a logic-level output, connect a pull-up resistor from pin POK to pin OUT. Larger values for this resistor will
help minimize current consumption; a 100kΩ resistor is perfect for most applications
Current Limit
The AS1361/AS1362 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 (AS1361) and 510mA (AS1362).
Note: See
Thermal Protection
Integrated thermal protection circuitry limits total power dissipation in the AS1361/AS1362. 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 AS1361/AS1362 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:
www.austriamicrosystems.com
indefinitely without causing damage to the device.
J
do not exceed the absolute maximum junction temperature rating of +150ºC.
) exceeds +160ºC, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass
IN
= 1V. A capacitor to GND may be added to generate a POR delay.
Table 4 on page 4
BYPASS
SHDNN
GND
IN
for the recommended min and max current limits. The output can be shorted to ground
Shutdown and
Power-Down
Thermal
Sensor
Control
PD = I
AS1361/AS1362
and Noise Bypass
1.25 Reference
OUT
Revision 1.03
AMB
(V
IN
+
-
, and airflow rate.
95%
Error
Amp
- V
OUT
)
Driver w/
MOS
I
LIMIT
–
+
(see Figure 1 on page
OUT
POK
1).
10 - 15
(EQ 1)