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PDF AS1321 Data sheet ( Hoja de datos )
| Número de pieza | AS1321 | |
| Descripción | Step-Up DC-DC Converter | |
| Fabricantes | AMSCO | |
| Logotipo |  |
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austriamicrosystems
AS1321
130mA Step-Up DC-DC Converter
Data Sheet
1 General Description
The AS1321 is a high-efficiency step-up DC-DC con-
verter designed to generate a fixed output voltage of
+5.0V.
The AS1321 achieves an efficiency of up to 96%. The
minimum input voltage is +1.5V, the output voltage is
fixed at +5.0V, and output current is up to 130mA
(@ 2V VBATT).
In order to save power the AS1321 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 AS1321 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 AS1321 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, which is
parallel with the external Schottky diode.
The AS1321 is available in a 6-pin SOT23 package.
2 Key Features
! Fixed Output Voltage: +5.0V
! Output Current: Up to 130mA (@ 2V VBATT)
! Internal Synchronous Rectifier
! Shutdown Mode Supply Current: Less Than 1µA
! Efficiency: Up to 96%
! 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 AS1321 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 +5.0V supply or as
a battery backup.
Figure 1. Application Diagram
2
BATT
+1.5 to +5.0V
Battery
CIN
22µF
L1
10µH
4
LX
On 1
Off SHDNN
AS1321
5
OUT
COUT
22µF
6
RESETN
+5.0V
Output
R1
100kΩ
RESETN
Output
3
GND
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1 page  
AS1321
Data Sheet
Figure 8. Line Transient
austriamicrosystems
Figure 9. Load Transient
100µs/Div
Figure 10. On/Off Response; RLOAD = 100Ω
130mA
2mA
500µs/Div
Figure 11. Shutdown Response; RLOAD = 100Ω
2ms/Div
Figure 12. Waveforms; RLOAD = 100Ω, VBATT = 3V
10µs/Div
500µs/Div
Figure 13. Efficiency vs. Load Current
100
95 VBATT = 4.5V
VBATT = 3.5V
90 VBATT = 3V
VBATT = 2.5V
VBATT = 2V
85
VBATT = 1.5V
80
75
1
10 100
Load Current (m A)
1000
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Revision 1.01
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AS1321
Data Sheet
austriamicrosystems
10 Ordering Information
The AS1321 is available as the standard products shown in Table 4.
Table 4. Ordering Information
Part
AS1321-T
Marking
ASKX
Description
130mA Step-Up DC-DC Converter
Delivery Form
Tape and Reel
Package
6-pin SOT23
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AS1321.PDF ] | |
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