AS1320 Datasheet, PDF (1/2 Pages) ams AG – 200mA Step-Up DC-DC Converter

austriamicrosystems
AS1320
200mA Step-Up DC-DC Converter
Product Brief
1 General Description
The AS1320 is a high-efficiency step-up DC-DC con-
verter designed to generate a fixed voltage of +3.3V.
The AS1320 achieves an efficiency of up to 90%. The
minimum input voltage is 1.5V, the output voltage is
fixed at 3.3V, and output current is up to 200mA (@ 2V).
In order to save power the AS1320 features a shutdown
mode, where it draws less than 1µA. In shutdown mode
the battery is connected directly to the output enabling
the supply of real-time-clocks.
The AS1320 provides a power-on reset output that goes
high-impedance when the output reaches 90% of its reg-
ulation point.
The SHDNN trip threshold of the AS1320 can be used
as an input voltage detector that disables the device
when the battery voltage falls to a predetermined level.
An internal synchronous rectifier is included, thus an
external transistor or Schottky diode is not required.
The AS1320 is available in a 6-pin SOT23 package.
Figure 1. Application Diagram
2 Key Features
! Fixed Output Voltage: 3.3V
! Output Current: Up to 200mA (@ 2V)
! Internal Synchronous Rectifier
! Requires No External Schottky Diode or FETs
! Shutdown Mode Supply Current: Less Than 1µA
! Efficiency: Up to 90%
! Minimum Input Voltage: +1.5V
! Accurate Shutdown Low-Battery Cutoff Threshold
! Battery Input Connected to Pin OUT in Shutdown
Mode for Backup Power
! 6-pin SOT23 Package
3 Applications
The AS1320 is ideal for low-power applications where
ultra-small size is critical as in medical diagnostic equip-
ment, hand-held instruments, pagers, digital cameras,
remote wireless transmitters, cordless phones, and PC
cards.
The device is also perfect as a local 3.3V supply or as a
battery backup.
2
BATT
+1.5 to +3.5V
Battery
CIN
22µF
4
L1
LX
10µH
On
1
Off
SHDNN
AS1320
5
OUT
COUT
22µF
6
RESETN
+3.3V
Output
R1
100kΩ
RESETN
Output
3
GND
www.austriamicrosystems.com
Revision 1.0