ISL65426_07 Datasheet, PDF (14/22 Pages) Intersil Corporation – 6A Dual Synchronous Buck Regulator with Integrated MOSFETs

ISL65426
Typical Performance Curves
Circuit of Figure 2. V_IN = 5V, I_OUT1 = 4A, I_OUT2 = 2A, T_A = -10°C to +100°C unless otherwise
noted. Typical values are at T_A = +25°C. (Continued)
LX2 5V/DIV
V_OUT2 1V/DIV
IL2 5A/DIV
PG2 5V/DIV
FIGURE 34. V_OUT2 = 3.3V OUTPUT SHORT CIRCUIT RECOVERY
50 49 48 47 46 45 44 43
PGND 1
42 ^PGND
PGND 2
41 ^PGND
PGND 3
40 ^PGND
PGND 4
39 PGND
LX1 5
38 LX6
LX1 6
PVIN1 7
PVIN2 8
LX2 9
PGND 10
PGND 11
LX3 12
PVIN3 13
VCC 14
VCC 15
VCC 16
PGND ¹⁷
PGND
37 LX6
36 PVIN6
35 PVIN5
34 LX5
33 PGND
32 PGND
31 LX4
30 PVIN4
29 PGND
28 PGND
27 GND
26 GND
18 19 20 21 22 23 24 25
Pin Descriptions
VCC
The bias supply input for the small signal circuitry. Connect
this pin to the highest supply voltage available if two or more
options are available. Locally filter this pin using a quality
0.1μF ceramic capacitor and 5Ω resistor (optional).
PVIN1, PVIN2, PVIN3, PVIN4, PVIN5, PVIN6
These pins are the power supply pins for the corresponding
PWM power blocks. Associated power blocks must all tie to
the same power supply. The power supply must fall in the
range of 2.375V to 5.5V.
GND
Signal ground. All small signal components connect to this
ground, which in turn connects to PGND at one point.
PGND
Power ground for the PWM power blocks and thermal relief
for the package. The exposed pad must be connected to
PGND and soldered to the PCB. Connect these pins closely
to the negative terminal of input and output capacitors.
FB1, FB2
Voltage feedback input. Depending on voltage selection pin
settings, connect an optional resistor divider between V_OUT
and GND for selection of a variable output voltage.
LX1, LX2, LX3, LX4, LX5, LX6
Switch node connection to inductor. This pin connects to the
internal synchronous power MOSFET switches. The
average voltage of this node is equal to the regulator output
voltage.
14
FN6340.2
February 21, 2007