www.austriamicrosystems.com/DC-DC_Step-Up/AS1321 Revision 1.03 4 - 13
AS1321
Datasheet - Electrical Characteristics
6 Electrical Characteristics
TAMB = -40 to +85ºC, VBATT = +2 V, VOUT = +5.0, VSHDNN = +1.5V (unless otherwise specified). Typical values @ TAMB = +25ºC.
Table 3. Electrical Characteristics
Symbol Parameter Conditions Min Typ Max Unit
VBATT Battery Input Range 1.5 5.0 V
VSU Startup Battery Input Voltage 1
1. Guaranteed by design.
RLOAD = 100Ω, TAMB = +25ºC 1.22 1.5 V
RLOAD = 100Ω, TAMB = -40 to +85ºC 1.24
VOUT Output Voltage 2
2. Voltage which triggers next loading cycle. Ripple and rms value depend on external components.
TAMB = +25ºC 4.950 5.000 5.050 V
TAMB = -40 to +85ºC 4.875 5.125
RNCH N-Channel
On-Resistance ILX = 100mA, TAMB = +25ºC 0.3 1.2 Ω
ILX = 100mA, TAMB = -40 to +85ºC 1.5
RPCH P-Channel On-Resistance ILX = 100mA, TAMB = +25ºC 0.4 1.3 Ω
ILX = 100mA, TAMB = -40 to +85ºC 1.6
IMAX N-Channel Switch Current Limit 1TAMB = +25ºC 550 700 850 mA
TAMB = -40 to +85ºC 450 950
tON Switch Maximum
On-Time TAMB = +25ºC 5 7 9 µs
TAMB = -40 to +85º C 4 10
Synchronous Rectifier
Zero-Crossing Current TAMB = +25ºC 8 30 60 mA
TAMB = -40 to +85º C 0 65
Quiescent Current into OUT 3
3. The Quiescent current is measured while the DC-DC Converter is not switching.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
VOUT = +5.5V, TAMB = +25ºC 35 55 µA
VOUT = +5.5V, TAMB = -40 to +85ºC 60
Shutdown Current into OUT VSHDNN = 0V, TAMB = +25ºC 0.01 1 µA
VSHDNN = 0V, TAMB = -40 to +85ºC 2
Quiescent Current into BATT3VOUT = +5.5V, TAMB = +25ºC 0.01 1 µA
VOUT = +5.5V, TAMB = -40 to +85ºC 2
Shutdown Current into BATT VSHDNN = 0V, TAMB = +25ºC 0.01 1 µA
VSHDNN = 0V, TAMB = -40 to +85ºC 2
SHDNN Logic Low 1VBATT = +1.5 to +5.0V 0.3 V
SHDNN Threshold Rising Edge, TAMB = +25ºC 1.185 1.228 1.271 V
Rising Edge, TAMB = -40 to +85ºC 1.170 1.286
SHDNN Threshold Hysteresis 0.02 V
RESETN Threshold Falling Edge, TAMB = +25ºC 4.288 4.500 4.712 V
Falling Edge, TAMB = -40 to +85ºC 4.242 4.758
RESETN Voltage Low
IRESETN = 1mA, VOUT = +2.5V,
TAMB = +25ºC 0.15 V
IRESETN = 1mA, VOUT = +2.5V,
TAMB = -40 to +85ºC 0.2
RESETN Leakage Current VRESETN = +5.5V, TAMB = +25ºC 0.1 100 nA
VRESETN = +5.5V, TAMB = +85ºC 1
LX Leakage Current TAMB = +25ºC 0.1 1000 nA
TAMB = +85ºC 10
ILOAD Maximum Load Current VBATT = +2V 130 mA
ηEfficiency VBATT = +3V, ILOAD = 100mA 91 %