ISL78228_15 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 AEC-Q100-011) . . . . . . . . . . . . . . . 2kV
Latch-Up (Tested per JESD78C; Class II, Level A) . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
_JA (°C/W) _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 TB493
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. _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 _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 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 Lockout Threshold
V_UVLO
Rising
Falling
2.5 2.75
V
2.1
2.4
V
Quiescent Supply Current
I_Q
SYNC = V_IN, EN1 = EN2 = V_IN, no load at the
output and no switches switching.
VFB1 = VFB2 = 0.7V
30
50
µA
Shut Down Supply Current
OUTPUT REGULATION
SYNC = GND, EN1 = EN2 = V_IN,
F_S = 2.25MHz, no load at the output
I_SD
V_IN = 5.5V, EN1 = EN2 = GND
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
I_pk1
I_pk2
I_skip1
I_skip2
V_IN = 3.6V
0.95
1.2
1.6
A
0.95
1.2
1.6
A
180
250
360
mA
180
250
360
mA
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
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
180
350
m
320
450
m
180
350
m
320
450
m
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4
FN7849.3
April 13, 2015