ISL78228_15 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 across the operating temperature range, -40°C to +105°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNITS
LX_ Maximum Duty Cycle
100

PWM Switching Frequency
F_S
Synchronization Range
1.8
2.25
2.7
MHz
2.7
4
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
Sinking 1mA, VFB = 0.5V
0.3
V
PG Pull-up Resistor
1
m
Internal PGOOD Low Rising Threshold
Percentage of nominal regulation voltage
88
92
96
m
Internal PGOOD Low Falling Threshold
Percentage of nominal regulation voltage
82
89
91
%
Delay Time (Rising Edge)
1
ms
Internal PGOOD Delay Time (Falling Edge)
1
2
µs
EN1, EN2, SYNC
Logic Input Low
0.4
V
Logic Input High
1.4
V
SYNC Logic Input Leakage Current
Enable Logic Input Leakage Current
Thermal Shutdown
I_SYNC
I_{EN_}
Pulled up to 5.5V
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.
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5
FN7849.3
April 13, 2015