AS1330 austriamicrosystems, AS1330 Datasheet - Page 2

• Manufacturer Part Number: AS1330
• Description: 4mhz, Low Voltage, Dc-dc Step-up Converter
• Manufacturer: austriamicrosystems

AS1330
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
Pin Descriptions
www.austriamicrosystems.com/DC-DC_Step-Up/AS1330
Table 1. Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
Pin Name
SENSE
VOUT
POK
GND
SW
VIN
EN
FB
Sense Input. Represents the input for the Power-OK behaviour. This input can be
used to supervise the input or the output voltage via a resistor divider. If connected
to GND the POK output is related to V
Feedback Pin. Feedback input to the g
tap to this pin. The output voltage can be adjusted from 1.8 to 3.3V by: V
0.8V[1 + (R
If the fixed output voltage version ist used, connect this pin to VOUT.
Active-High Enable Input. A logic LOW reduces the supply current to < 1µA.
Connect to pin VIN for normal operation.
Power-OK Output. Active-High, open-drain output indicates an out-of-regulation
condition. Connect a 100kΩ pull-up resistor to pin OUT for logic levels. Leave this
pin unconnected if the Power-OK feature is not used.
Low Level:
High Level:
Signal and Power Ground. Provide a short, direct PCB path between this pin and
the negative side of the output capacitor(s).
Switch Pin. Connect an inductor between this pin and V
lengths as short and wide as is practical to reduce EMI and voltage overshoot. If
the inductor current falls to zero, or pin EN is low, an internal 100Ω anti-ringing
switch is connected from this pin to V
Note: An optional Schottky diode can be connected between this pin and V
Output Voltage. Bias is derived from V
length from V
practical.
Input Voltage. The AS1330 gets its start-up bias from V
V
completely independent from V
level and the internal series resistance of the supply.
Exposed Pad. The exposed pad must be connected to GND. Ensure a good
connection to the PCB to achieve optimal thermal performance.
IN
, in which case the bias is derived from V
SENSE
POK
EN
FB
1
/R
OUT
1
2
3
4
2
)]
to the output filter capacitor(s) should be as short and wide as is
AS1330
Revision 1.04
9
8 VIN
7 VOUT
6 SW
5 GND
IN
. Operation is only limited by the output power
Description
IN
OUT
OUT
m
to minimize EMI.
error amplifier. Connect a resistor divider
.
when V
OUT
. Thus, once started, operation is
OUT
exceeds V
IN
IN
. Keep the PCB trace
unless V
IN
OUT
. PCB trace
exceeds
OUT
OUT
=
2 - 16
.