Datasheet
Electrical characteristics ST1S15
6/28 DocID023280 Rev 3
4 Electrical characteristics
- 40 °C < T
A
< 85 °C, C
IN
= 4.7 µF nominal, C
OUT
= 4.7 µF nominal, L = 470 nH, typical
values are at T
A
= 25 °C, V
EN
= V
IN
unless otherwise specified.
Table 7. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
General section
V
IN
Operating input voltage range 2.3 5.5 V
V
UVLO
Undervoltage lockout threshold
V
IN
rising 2.1 2.2 V
V
IN
falling 1.8 1.9
I
Q
PFM mode quiescent current No load 45 60 µA
PWM mode quiescent current No load 15 mA
Shutdown current V
EN
= 0 0.5 5 µA
f
SW
Switching frequency 5.4 6 6.6 MHz
I
OUT
Continuous output current
(1)
V
IN
≥
V
OUT
+ 0.40 V 500 mA
I
SC
Short-circuit current
(2)
1200 mA
I
PFM-
PWM
PFM to PWM transition
V
IN
= 3.6V, V
OUT
= 1.82 V
200
mA
PWM to PFM transition 100
h
Efficiency (V
IN
= 3.6 V, V
OUT
=
1.82 V)
I
OUT
= 10 mA PFM mode 80
%
I
OUT
= 150 mA 83
t
ON
Startup time
V
EN
from low to high, V
IN
= 3.6
V, V
OUT
= 1.82 V
260 µs
T
SHDN
Thermal shutdown 125 °C
Hysteresis 30 °C
Output voltage
V
OUT
Accuracy (ST1S15x18)
2.3 ≤ V
IN
≤ 5.5 V, I
OUT
= 10 mA,
PWM mode, -40 ≤ T
A
≤ 85 °C
1.78 1.82 1.86
V
2.3 ≤ V
IN
≤ 5.5 V, I
OUT
= 10 mA,
PFM mode, -40 ≤ T
A
≤ 85 °C
1.78 1.82 1.86
Load regulation
2.3 ≤ V
IN
≤ 5.5 V, V
OUT
=1.82 V,
I
OUT
= 0 to 500 mA, PWM
mode, -40 ≤ T
A
≤ 85 °C
-1.5 %
Accuracy (ST1S15x28)
3.2 ≤ V
IN
≤ 5.5 V, I
OUT
= 10 mA,
PWM mode, -40 ≤ T
A
≤ 85 °C
2.74 2.8 2.86
V
3.2 ≤ V
IN
≤ 5.5 V, I
OUT
= 10 mA,
PFM mode, -40 ≤ T
A
≤ 85 °C
2.74 2.8 2.86
Load regulation
3.2 ≤ V
IN
≤ 5.5 V, V
OUT
= 2.8 V,
I
OUT
= 0 to 500 mA, PWM
mode, - 40 ≤ T
A
≤ 85 °C
-1.5 %