ISL78322 Datasheet, PDF (5/18 Pages) Intersil Corporation – Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78322
Absolute Maximum Ratings (Reference to GND)
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . -0.3V to 6V (DC) or 7V (20ms)
EN1, EN2, PG, SYNC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to V_IN + 0.3V
LX1, LX2. . . . . . . . . . . . . . . . . . . . . . . -1.5V (100ns)/-0.3V (DC) to 6.5V (DC)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . or 7V (20ms)
FB1, FB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . . . 3kV
Machine Model(Tested per JESD22-C101E) . . . . . . . . . . . . . . . . . . 250V
Charged Device Model (Tested per AEC-Q100-11) . . . . . . . . . . . . . . . 2kV
Latch-up (Tested per JESD-78B; Class 2, Level A) . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
_JA (°C/W) _JC (°C/W)
4x3 DFN Package (Notes 4, 5) . . . . . . . .
41
3
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-55°C to +150°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
V_IN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8V to 5.5V
Load Current Range Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 2A
Load Current Range Channel 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 1.7A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. _JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. _JC, “case temperature” location is at the center of the exposed metal pad on the package underside.
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.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6)
UNITS
INPUT SUPPLY
V_IN Undervoltage Lock-out Threshold
V_UVLO
Rising
Falling
2.5
2.8
V
2.0
2.4
V
Quiescent Supply Current
I_VIN SYNC = V_IN, EN1 = EN2 = V_IN, no switches
switching
40
55
µA
Shutdown Supply Current
OUTPUT REGULATION
SYNC = GND, EN1 = EN2 = V_IN,
f_SW = 2.25MHz, no load at the output
I_SD
V_IN = 5.5V, EN1 = EN2 = GND
0.86
1
mA
6.5
12
µA
FB1, FB2 Regulation Voltage
FB1, FB2 Bias Current
Output Voltage Accuracy
V_{FB_}
I_{FB_}
VFB = 0.55V
SYNC = V_IN, Io = 0A to 2A
SYNC = GND, Io = 0A to 2A
0.590 0.6 0.610
V
0.1
µA
±1.5
%
±1
%
Line Regulation
Soft-Start Ramp Time Cycle
V_IN = V_O + 0.5V to 5.5V (minimal 2.8V)
0.2
%/V
1.3
ms
OVERCURRENT PROTECTION
Dynamic Current Limit ON-time
t_OCON
17
Clock
pulses
Dynamic Current Limit OFF-time
Peak Overcurrent Limit
Peak SKIP Limit
t_OCOFF
I_pk1
I_pk2
I_skip1
I_skip2
4
SS cycle
2.7
3.2
3.6
A
2.3
2.8
3.2
A
520
610
730
mA
520
610
730
mA
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FN7908.2
August 26, 2014