ISL78228ARZ-T Datasheet, PDF (4/18 Pages) Intersil Corporation – Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

ISL78228
Absolute Maximum Ratings (Reference to GND)
Supply Voltage (V_IN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
V_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V (20ms)
EN1, EN2, PG, SYNC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to V_IN + 0.3V
LX1, LX2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.5V to 6.5V
LX1, LX2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.5V (100ns)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V (DC) to 7V (20ms)
FB1, FB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
ESD Rating
Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . 3kV
Machine Model (Tested per JESD-A115-A) . . . . . . . . . . . . . . . . . . . 300V
Charge Device Model (Tested per JESD22-C101C). . . . . . . . . . . . . . . 2kV
Latch Up (Tested per JESD78C; Class II, Level A) . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
θ_JA (°C/W) θ_JC(°C/W)
10 Ld 3x3 DFN Package (Notes 4, 5) . . . . . .
49
4
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
V_IN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.75V to 5.5V
Load Current Range Per Channel . . . . . . . . . . . . . . . . . . . . . 0mA to 800mA
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°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. θ_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. For θ_JC, the “case temp” location is 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 = 2.75V 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.
PARAMETER
INPUT SUPPLY
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNITS
V_IN Undervoltage Lockout Threshold
V_UVLO
Rising
Falling
2.5 2.75
V
2.1
2.4
V
Quiescent Supply Current
Shut Down Supply Current
OUTPUT REGULATION
I_VIN SYNC = V_IN, EN1 = EN2 = V_IN, no load at the
output and no switches switching.
VFB1 = VFB2 = 0.7V
SYNC = GND, EN1 = EN2 = VIN,
F_S = 2.25MHz, no load at the output
I_SD V_IN = 5.5V, EN1 = EN2 = GND
30
50
µA
0.1
1
mA
6.5
12
µA
FB1, FB2 Regulation Voltage
FB1, FB2 Bias Current
Line Regulation
Soft-Start Ramp Time Cycle
V_{FB_}
I_{FB_}
VFB = 0.55V
V_IN = V_O + 0.5V to 5.5V (minimal 2.75V,
I_OUT = 0A)
0.590 0.6 0.610
V
0.1
µA
0.2
%/V
2
ms
OVERCURRENT PROTECTION
Peak Overcurrent Limit
Peak SKIP Limit
LX1, LX2
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
I_pk1
I_pk2
I_skip1
I_skip2
V_IN = 3.6V
V_IN = 5.5V, I_O = 200mA
V_IN = 2.75V, I_O = 200mA
V_IN = 5.5V, I_O = 200mA
V_IN = 2.75V, I_O = 200mA
0.95
1.2
1.6
A
0.95
1.2
1.6
A
180 250 360
mA
180 250 360
mA
180 350
mΩ
320 450
mΩ
180 350
mΩ
320 450
mΩ
4
FN7849.2
December 4, 2013