AS1349 Austin Semiconductor, AS1349 Datasheet - Page 11

• Manufacturer Part Number: AS1349
• Description: (AS1346 - AS1349) Dual Step Down Converter
• Manufacturer: Austin Semiconductor

AS1346, AS1347, AS1348, AS1349
Datasheet - D e t a i l e d D e s c r i p t i o n
In case of the LBI pin is connected to GND, an internal resistor-divider network is activated and compares the output
voltage with a 92.5% voltage threshold
this particular Power-OK application, no external resistive components (R1 and R2) are necessary.
Figure 18. Typical Application Diagram with adjustable Battery Monitoring
Thermal Shutdown
Due to its high-efficiency design, the AS1346 will not dissipate much heat in most applications. However, in applica-
tions where the AS1346 is running at high ambient temperature, uses a low supply voltage, and runs with high duty
cycles (such as in dropout) the heat dissipated may exceed the maximum junction temperature of the device.
As soon as the junction temperature reaches approximately 150ºC the AS1346 goes in thermal shutdown. In this mode
the internal PMOS & NMOS switch are turned off. The device will power up again, as soon as the temperature falls
below +140°C again.
www.austriamicrosystems.com/DC-DC_Step-Down/AS1346
4.5V to 5.5V
V
IN
C
IN
R1
R2
(see AS1346 - Typical Application Diagram with POK Function on page
PVIN
PVIN
VDD
EN1
EN2
LBI
AS1346
Revision 1.01
PGND
SW1
FB1
SW2
FB2
LBO
AGND
L1 = 3.3µH
L2 = 3.3µH
R3
C
OUT1
C
OUT2
V
3.3V 1200mA
V
1.8V 500mA
OUT1
OUT2
www.DataSheet4U.com
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