AS1346-49
Datasheet - Detailed Description
Figure 18. Typical Application Diagram with Adjustable Battery Monitoring
L1 = 3.3μH
L2 = 3.3μH
VIN
4.5V to 5.5V
VOUT1
3.3V 1200mA
PVIN
SW1
FB1
COUT1
CIN
PVIN
AS1346
VOUT2
1.8V 500mA
VDD
EN1
SW2
COUT2
FB2
R3
EN2
LBI
R1
R2
LBO
AGND
PGND
8.5 Thermal Shutdown
Due to its high-efficiency design, the AS1346 will not dissipate much heat in most applications. However, in applications 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 +140ºC again.
www.ams.com/DC-DC_Step-Down
Revision 1.10
11 - 16
AMSCO [ AMS(艾迈斯) ]
