www.austriamicrosystems.com/DC-DC_Step-Down/AS1333 Revision 1.06 4 - 17
AS1333
Datasheet - Electrical Characteristics
6 Electrical Characteristics
TAMB = TJ = -40ºC to +85ºC; PVIN = VDD = EN = 3.6V, unless otherwise noted
.
Typical values are at TAMB=25°C.
6.1 System Characteristics
TA = 25ºC; PVIN = VDD = EN = 3.6V, unless otherwise noted
.
The following parameters are verified by characterisation and are not production
tested
.
Table 3. Electrical Characteristics
Symbol Parameter Conditions Min Typ Max Units
TAMB Operating Temperature Range -40 +85 ºC
VFB Feedback Voltage PVIN = 3.6V 3.028 3.09 3.15 V
ISHDN Shutdown supply current EN = SW = 0V1
1. Shutdown current includes leakage current of PFET.
0.01 2 µA
IQDC bias current into VDD FB = 0V, No Switching2
2. IQ specified here is when the part is operating at 100% duty cycle.
11.4mA
RDSON(P) Pin-Pin Resistance for PFET ISW = 200mA; TAMB = +25°C 140 200 mΩ
ISW = 200mA 230
RDSON(N) Pin-Pin Resistance for NFET ISW = -200mA; TAMB = +25°C 300 415 mΩ
ISW = -200mA 485
ILIM,PFET Switch peak current limit Current limit is built-in, fixed, and not
adjustable. 935 1100 1200 mA
FOSC Internal oscillator frequency 1.8 2 2.2 MHz
VIH,EN Logic high input threshold 1.2 V
VIL,EN Logic low input threshold 0.5 V
IPIN,ENABLE Pin pull down current 5 10 µA
Table 4. System Characteristics
Symbol Parameter Conditions Min Typ Max Units
T_ON Turn on time (time for output to reach
3.09V from Enable low to high
transition)
EN = Low to High, VIN = 4.2V,
VOUT = 3.09V, COUT = 10µF,
IOUT ≤ 1mA 210 350 µs
ηEfficiency
(L = 3.3µH, DCR ≤ 100mΩ)VIN = 3.6V, VOUT = 3.09V,
IOUT = 400mA 96 %
VOUT_ripple Ripple voltage, PWM mode1
1. Ripple voltage should measured at COUT electrode on good layout PC board and under condition using suggested inductors and
capacitors.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
VIN = 4.2V, VOUT = 3.09V,
IOUT = 10mA to 400mA 5mVp-p
Line_tr Line transient response VIN = 600mV perturbance, over Vin range
3.4V to 5.5V
TRISE = TFALL = 10µs, VOUT = 3.09V, IOUT =
100mA 50 mVpk
Load_tr Load transient response VIN = 4.2V, VOUT = 3.09V, transients up
to 100mA, TRISE = TFALL = 10µs 50 mVpk