ISL78228ARZ-T Datasheet, PDF (5/18 Pages) Intersil Corporation – Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78228
Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating
conditions: T_A = -40°C to +105°C, V_IN = 2.75V to 5.5V, EN1 = EN2 = V_IN, SYNC = 0V, L = 2.2µH, C₁ = 10µF, C₂ = C₄ = 10µF,
I_OUT1 = I_OUT2 = 0A to 800mA. (Typical values are at T_A = +25°C, V_IN = 3.6V). Boldface limits apply over the operating temperature range,
-40°C to +105°C. (Continued)
PARAMETER
LX_ Maximum Duty Cycle
PWM Switching Frequency
Synchronization Range
SYMBOL
F_S
TEST CONDITIONS
MIN
(Note 6)
1.8
2.7
TYP
100
2.25
MAX
(Note 6)
2.7
4
UNITS
%
MHz
MHz
LX Minimum On-Time
SYNC = 0 (forced PWM mode)
100
ns
Soft Discharge Resistance
PG
R_{DIS_} EN = LOW
80
100 130
Ω
Output Low Voltage
PG Pull-up Resistor
Internal P_GOOD Low Rising Threshold
Internal P_GOOD Low Falling Threshold
Delay Time (Rising Edge)
Sinking 1mA, VFB = 0.5V
Percentage of nominal regulation voltage
Percentage of nominal regulation voltage
0.3
V
1
mΩ
88
92
96
mΩ
82
89
91
%
1
ms
Internal P_GOOD Delay Time (Falling Edge)
EN1, EN2, SYNC
1
2
µs
Logic Input Low
Logic Input High
SYNC Logic Input Leakage Current
Enable Logic Input Leakage Current
Thermal Shutdown
I_SYNC
I_{EN_}
Pulled up to 5.5V
0.4
V
1.4
V
0.1
1
µA
0.1
1
µA
150
°C
Thermal Shutdown Hysteresis
25
°C
NOTE:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
5
FN7849.2
December 4, 2013