ISL78322 Datasheet, PDF (6/18 Pages) Intersil Corporation – Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78322
Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating
conditions: T_A = -40°C to +105°C, V_IN = 2.8V to 5.5V, EN1 = EN2 = V_IN, SYNC = 0V, L = 1.2µH, C₁ = 2 x 10µF, C₂ = C₄ = 22µF, I_OUT1 = 0A to 2A,
I_OUT2 = 0A to 1.7A. (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
Negative Current Limit
LX1, LX2
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
LX_ Maximum Duty Cycle
I_valley1
I_valley2
V_IN = 5.5V, I_O = 200mA Channel 1
V_IN = 5.5V, I_O = 200mA Channel 2
V_IN = 5.5V, I_O = 200mA Channel 1
V_IN = 5.5V, I_O = 200mA Channel 2
-2.2
-1.6
-1
A
-2.2
-1.6
-1
A
90
115
mΩ
100
125
mΩ
80
103
mΩ
90
112
mΩ
100

PWM Switching Frequency
Synchronization Range
f_SW
(Note 7)
1.8
2.25
2.7
MHz
5.4
8
MHz
Channel 1 to Channel 2 Phase Shift
Rising edge to rising edge timing
180
°
LX Minimum On Time
SYNC = High (forced PWM mode)
65
ns
Soft Discharge Resistance
PG
R_{DIS_} EN = LOW
80
100
130
Ω
Output Low Voltage
Sinking 1mA, VFB = 0.5V
0.4
V
PG Pin Leakage Current
PG Pull-up Resistor
PG = V_IN = 3.6V
0.01
0.1
µA
1
MΩ
Internal PGOOD Low Rising Threshold
Percentage of nominal regulation voltage
85
91
97
%
Internal PGOOD Low Falling Threshold
Percentage of nominal regulation voltage
78
85
92
%
Delay Time (Rising Edge)
0.76
ms
Internal PGOOD Delay Time (Falling Edge)
2
4
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
NOTES:
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.
7. The operational frequency per switching channel will be half of the SYNC frequency.
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6
FN7908.2
August 26, 2014