AIC1571 AIC [Analog Intergrations Corporation], AIC1571 Datasheet - Page 12

• Manufacturer Part Number: AIC1571
• Description: 5-bit DAC, Synchronous PWM Power Regulator with Dual Linear Controllers
• Manufacturer: AIC [Analog Intergrations Corporation]

Holding the SS pin low with an open drain or
collector signal turns off all three regulators.
The VID codes resulting in an INHIBIT as
shown in Table 1 also shut down the IC.
Layout Considerations
Any inductance in the switched current path
generates a large voltage spike during the
3. Determine I
PWM OUT1 Voltage Program
The output voltage of the PWM converter is
programmed to discrete levels between 1.3V to
3.5V. The VID pins program an internal voltage
reference (DACOUT) through a TTL compati-
ble 5 bit digital to analog converter. The VID
pins can be left open for a logic 1 input, be-
cause they are internally pulled up to 5V by a
70kΩ resistor. Changing the VID inputs during
operation is not recommended. All VID pin
combinations resulting in an INHIBIT disable
the IC and the open collector at the PGOOD
pin.
Shutdown
Table 1 V
VID4
table.
current) /2.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
OUT1
VID3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Voltage Program (0=connected to GND, 1=open or connected to 5V)
PEAK
PIN NAME
VID2
> I
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
OUT(MAX)
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
+ (inductor ripple
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VOLTAGE
DACOUT
For all package version
1.80 V
1.85 V
1.90 V
1.95 V
2.00 V
2.05 V
1.30V
1.35V
1.40V
1.45V
1.50V
1.55V
1.60V
1.65V
1.70V
1.75V
VID4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
switching interval. The voltage spikes can de-
grade efficiency, radiate noise into the circuit,
and lead to device over-voltage stress. Careful
VID3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
PIN NAME
VID2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
AIC1571
VOLTAGE
DACOUT
INHIBIT
2.1 V
2.2 V
2.3 V
2.4 V
2.5 V
2.6 V
2.7 V
2.8 V
2.9 V
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
3.5 V
12