AIC1569A
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2.2V
2.1V
PIN 4: VID0
PIN 5: VID1
PIN 6: VID2
PIN 7: VID3
PIN 8: VID4
2.0V
2.05V
2.00V
1.95V
1.90V
1.85V
1.80V
1.75V
1.70V
1.65V
1.60V
1.55V
1.50V
1.45V
1.40V
1.35V
1.30V
- 5-bit DAC voltage select pin. TTL
inputs used to set the internal
voltage reference VDAC. When
left open, these pins are
internally pulled up to 5V and
provide logic ones. The level of
VDAC sets the converter output
voltage as well as the PGOOD
and OVP thresholds.
Table 1 specifies the VDAC
voltage for the 32 combinations
of DAC inputs.
PIN 9:COMP - External compensation pin. This
pin is connected to error
amplifier output and PWM
comparator. An RC network is
connected to FB pin to
compensate the voltage-control
feedback loop of the converter.
PIN 13:PHASE - Over current detection pin. Connect
the PHASE pin to source of the
external MOSFET. This pin detects
the voltage drop across the MOSFET
RDS(ON) for over-current protection.
PIN 10:FB
- The error amplifier inverting
input pin. The FB pin and COMP
pin are used to compensate the
voltage-control feedback loop.
PIN 14: UGATE- External MOSFET gate drive pin.
Connect UGATE to gate of the
external MOSFET.
PIN 11:GND
- Signal GND. It also serves as
the power GND for the upper
gate driver.
PIN 15: BOOT - External MOSFET driver power
supply pin. To convert 5V main power
PIN 12:PGOOD- Power good indicator pin.
PGOOD is an open drain output.
This pin is pulled low when the
converter output is 10% out of
the VDAC reference voltage.
to VCORE power by driving N-channel
MOSFET,
supply voltage of no
higher than 12V is recommended
since the negative power terminal of
the internal driver is internally tied to
GND.
Table 1. Output Voltage Program
VID4 VID3 VID2 VID1 VID0 VDAC
PIN 16:PGND - Driver power GND pin. PGND should
be connected to a low impedance
ground plane close to lower N-
MOSFET source.
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
2.6V
2.5V
2.4V
2.3V
PIN 17:LGATE - Lower N-MOSFET gate driver pin.
PIN 18: VCC - The chip power supply pin. It also
serves as power supply for LGATE
driver. Recommended supply voltage
is 12V.
PIN 19:OVP
-Over voltage indicator pin. This pin
also provides a driver source current
to turn on an external SCR in the
event of an over voltage condition.
6
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