ISL78236 Datasheet, PDF (8/24 Pages) Intersil Corporation – Dual 3A Current Sharing 2.5MHz High Efficiency Synchronous Buck Regulator

ISL78236
Absolute Maximum Ratings (Reference to SGND)
VIN1, VIN2, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
LX1, LX2 (Note 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
EN1, EN2, PG1, PG2, SYNC, SS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
FB1, FB2, COMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +2.7V
ESD Ratings
Human Body Model (Tested per AEC-Q100-002) . . . . . . . . . . . . . . . . 4kV
Machine Model (Tested per AEC-A100-003) . . . . . . . . . . . . . . . . . . . 300V
Charged Device Model (Tested per AEC-Q100-011). . . . . . . . . . . . . . 2kV
Latch Up (Per JESD-78D; Class 2, Level A; AEC-Q100-004) . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
_JA (°C/W) _JC (°C/W)
24 Ld 4x4 QFN (Notes 5, 6). . . . . . . . . . .
36
2
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-55°C to +150°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.85V to +6V
Load Current Range per Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 3A
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. Values shown for continuous voltage. Absolute Maximum Rating of 7V for a duration less than 20ms. Absolute Maximum Rating of -1.5V for duration
of less than 100ns.
5. _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.
6. For _JC, “case temperature” location is at the center of the exposed metal pad on the package underside.
Electrical Specifications Unless otherwise noted, the typical specifications are measured at the following conditions:
T_A = -40°C to +105°C, V_IN = 3.6V, EN1 = EN2 = VDD, L = 1.5µH, C1 = C2 = C4 = 2x22µF, I_OUT1 = I_OUT2 = 0A to 3A, unless otherwise noted. Typical values
are at T_A = +25°C. Boldface limits apply across the operating temperature range, -40°C to +105°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 7) TYP (Note 7)
UNITS
INPUT SUPPLY
VIN Undervoltage Lockout Threshold
V_UVLO
Rising
Hysteresis
2.5 2.85
V
40
100
mV
Quiescent Supply Current
I_VDD SYNC = V_DD, EN1 = EN2 = VDD, no load at the
output
30
70
mA
Shutdown Supply Current
OUTPUT REGULATION
I_SD
V_IN = V_DD = 6V, EN1 = EN2 = SGND
8
35
µA
FB1, FB2 Regulation Voltage
FB1, FB2 Bias Current
Load Regulation
V_FB
I_FB
VFB = 0.75V
SYNC = VDD, output load from 0A to 6A
0.784 0.8 0.810
1
2
V
µA
mV/A
Line Regulation
Soft-start Ramp Time Cycle
V_IN = V_O + 0.5V to 6V (minimal 2.85V)
SS = VDD
0.1
%/V
1.5
ms
Soft-start Charging Current
I_SS
COMPENSATION
4
5
6
µA
Error Amplifier Trans-Conductance
SS = VDD
20
µA/V
SS with Capacitor
100
µA/V
Current Sense Amplifier Gain
CSA_GAIN
0.172 0.2 0.228
V/A
Ch1/Ch2 Amplifier Gain Matching
OVERCURRENT PROTECTION
GAIN_MATCH
-0.05
+0.05
V/A
Dynamic Current Limit ON-time
Dynamic Current Limit OFF-time
Positive Peak Overcurrent Limit
Negative Peak Overcurrent Limit
t_OCON
t_OCOFF
I_poc1
I_poc2
I_noc1
I_noc2
17
Clock pulses
8
SS cycle
4.1
4.8
5.5
A
4.1
4.8
5.5
A
-3.5 -2.5 -1.5
A
-3.5 -2.5 -1.5
A
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FN8624.0
April 28, 2014