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What is AS1325?

This electronic component, produced by the manufacturer "austriamicrosystems", performs the same function as "Step-Up DC-DC Converter".


AS1325 Datasheet PDF - austriamicrosystems

Part Number AS1325
Description Step-Up DC-DC Converter
Manufacturers austriamicrosystems 
Logo austriamicrosystems Logo 


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AS1325
300mA Step-Up DC-DC Converter
Data Sheet
1 General Description
The AS1325 is a high-efficiency step-up DC-DC con-
verter designed to generate a fixed output voltage of
+3.3V or +5V.
The AS1325 achieves an efficiency of up to 96% and the
minimum input voltage is 1.5V. The AS1325-BSTT-33
delivers up to 300mA output current at the fixed output
voltage of +3.3V (@ 2V VBATT). With the fixed output
voltage of +5V the AS1325-BSST-50 supplies up to
185mA output current (@ 2V VBATT).
In order to save power the AS1325 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 AS1325 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 AS1325 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.
The AS1325 is available in a 6-pin SOT23 package.
Figure 1. Application Diagram
2 Key Features
! Fixed Output Voltage:
- 3.3V (AS1325-BSTT-33) or 5V (AS1325-BSST-50)
! Output Current:
- Up to 300mA (AS1325-BSTT-33) @ 2V VBATT
- Up to 185mA (AS1325-BSST-50) @ 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
! Antiringing Control Minimizes EMI
! Ripple Reduction at Light Loads
! 6-pin SOT23 Package
3 Applications
The AS1325 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 supply or as
a battery backup.
2
BATT
+1.5 to +3.3V or
+1.5 to +5.0V
Battery
CIN
22µF
L1
10µH
4
LX
On 1
Off SHDNN
+5.0V Output only
5
OUT
COUT
22µF
AS1325
6
RESETN
+3.3 or
+5.0V
Output
R1
100kΩ
RESETN
Output
3
GND
www.austriamicrosystems.com
Revision 1.01
1 - 17

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AS1325 equivalent
AS1325
Data Sheet - Electrical Characteristics
2. Voltage which triggers next loading cycle. Ripple and rms value depend on external components.
5.0V Output
TAMB = -40 to +85ºC, VBATT = +2V, VOUT = +5.0, VSHDNN = +1.5V (unless otherwise specified). Typ values @ TAMB = +25ºC.
Table 4. Electrical Characteristics
Parameter
Battery Input Range
Startup Battery Input Voltage 1
Output Voltage 2
N-Channel
On-Resistance
P-Channel On-Resistance
Light Load N-Channel Switch
Current Limit
N-Channel Switch Current Limit 1
Switch Maximum
On-Time
P-Channel Minimum On-Time
Synchronous Rectifier
Zero-Crossing Current
Quiescent Current into OUT
Shutdown Current into OUT
Shutdown Current into BATT
SHDNN Logic Low 1
SHDNN Threshold
SHDNN Threshold Hysteresis
RESETN Threshold
RESETN Voltage Low
RESETN Leakage Current
LX Leakage Current
Maximum Load Current
Efficiency
Symbol
Conditions
VBATT
RLOAD = 100Ω, TAMB = +25ºC
VSU
RLOAD = 100Ω, TAMB = -40 to +85ºC
VOUT
TAMB = +25ºC
TAMB = -40 to +85ºC
RNCH
ILX = 100mA, TAMB = +25ºC
ILX = 100mA, TAMB = -40 to +85ºC
RPCH
ILX = 100mA, TAMB = +25ºC
ILX = 100mA, TAMB = -40 to +85ºC
IMAX
tON
TAMB = +25ºC
TAMB = -40 to +85ºC
TAMB = +25ºC
TAMB = -40 to +85ºC
TAMB = +25ºC
TAMB = -40 to +85ºC
VOUT = +5.5V, TAMB = +25ºC
VOUT = +5.5V, TAMB = -40 to +85ºC
VSHDNN = 0V, TAMB = +25ºC
VSHDNN = 0V, TAMB = -40 to +85ºC
VSHDNN = 0V, TAMB = +25ºC
VSHDNN = 0V, TAMB = -40 to +85ºC
VBATT = +1.5 to +5.0V
Rising Edge, TAMB = +25ºC
Rising Edge, TAMB = -40 to +85ºC
ILOAD
η
Falling Edge, TAMB = +25ºC
Falling Edge, TAMB = -40 to +85ºC
IRESETN = 1mA, VOUT = +2.5V,
TAMB = +25ºC
IRESETN = 1mA, VOUT = +2.5V,
TAMB = -40 to +85ºC
VRESETN = +5.5V, TAMB = +25ºC
VRESETN = +5.5V, TAMB = +85ºC
TAMB = +25ºC
TAMB = +85ºC
VBATT = +2V
VBATT = +3V, ILOAD = 100mA
Min
1.5
4.950
4.875
550
450
5
4
8
0
1.185
1.170
4.288
4.242
Typ
1.22
1.24
5.000
0.3
0.4
400
700
7
1
30
35
0.01
0.01
1.228
0.02
4.500
0.1
1
0.1
10
185
91
Max
5.0
1.5
5.050
5.125
1.2
1.5
1.3
1.6
850
950
9
10
60
65
55
60
1
2
1
2
0.3
1.271
1.286
4.712
4.758
0.15
0.2
100
1000
Unit
V
V
V
Ω
Ω
mA
mA
µs
µs
mA
µA
µA
µA
V
V
V
V
V
nA
nA
mA
%
1. Guaranteed by design.
2. Voltage which triggers next loading cycle. Ripple and rms value depend on external components.
www.austriamicrosystems.com
Revision 1.01
5 - 17


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