1 H5STRAP +5.1V section bootstrap capacitor connection
2 VIN Device supply voltage. From 5.5 to 25V
3 REG5 +5V regulator supply. Used mainly for bootstrap capacitors. It should be bypassed to ground.
4 V5SW Alternative device supply voltage. When the +5.1V section is operating, the device is no
longer powered through VIN but through this pin.
5 V5SNS This pin connects to the (-) input of the +5.1V internal current sense comparator
6 I5SNS This pin connects to the (+) input of the +5.1V internal current sense comparator
7 COMP5 Feedback input for the +5.1V section.
8 SOFT5 Soft-start input of the +5.1V section. The soft-start time is programmed by an external
capacitor connected between this pin and SGND. Approximately, 1ms/nF @ full load.
9 CRST Input used for start-up and shut-down timing. A capacitor defines a time of 2ms/nF.
10 PWROK Power-good diagnostic signal. This output is driven high when both switching sections are
enabled and running properly, after a delay defined by the CRST capacitor.
11 RUN5 Control input to enable/disable the 5.1V section. A high level (>2.4V) enables this section, a
low level (<0.8V) shuts it down
12 VREF Internal +3.39V high accuracy voltage generator. It can source 5mA to external load. Bypass
to ground with a 4.7µF capacitor to reduce noise.
13 SGND Signal ground. Reference for internal logic circuitry. It must be routed separately from high
14 NOSKIP Pulse skipping mode control. A high level (>2.4V) disables pulse skipping at low load current,
a low level (<0.8V) enables it.
Oscillator frequency control: connect to 2.5V to select 300KHz operation, to ground or to 5V
for 200KHz operation. A proper external signal can synchronize the oscillator
16 RUN3 Control input to enable/disable the +3.3V section. A high level (>2.4V) enables this section, a
low level (>0.8V) shuts it down.
17 SOFT3 Soft-start input for the 3.3V section. The soft-start time is programmed by an external
capacitor connected between this pin and GND. Approximately, 1ms/nF @full load.
18 COMP3 Feedback input for the +3.3V section
19 I3SNS This pin connects to the (+) input of the +3.3V internal current sense comparator
20 V3SNS This pin connects to the (-) input of the +3.3V internal current sense comparator
21 V13IN 12V regulator input supply voltage, included between 13 and 20V. This voltage can be
supplied by a flyback winding on +3.3V inductor
22 REG12 12V regulator output voltage. It can source up to 150mA to an external load
23 SGND To be connected to pin 13
24 H3STRAP +3.3V section bootstrap capacitor connection
25 H3GATE Gate- driver output for the +3.3V high-side N-MOS
26 H3SRC +3.3V high-side N-MOS source connection
27 R3GATE Gate- driver output for the +3.3V low- side N-MOS (synchronous rectifier).
28 PGND3 Current return for +3.3V section drivers
29 PGND5 Current return for +5.1V section drivers
30 R5GATE Gate-driver output for the +5.1V low-side N-MOS (synchronous rectifier).
31 H5SRC +5.1V high-side N-MOS source connection
32 H5GATE Gate-driver output for the +5.1V high-side N-MOS