AS1330 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS1330 Datasheet PDF : 18 Pages
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AS1330
Datasheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
SENSE 1
8 VIN
FB 2
7 VOUT
AS1330
EN 3
6 SW
lid POK 4
9 5 GND
a Pin Descriptions
v Table 1. Pin Descriptions
ill Pin Number
Pin Name
1
SENSE
G st 2
FB
A t 3
EN
s en 4
POK
am nt 5
GND
co 6
SW
l 7
VOUT
a 8
VIN
Technic 9
Description
Sense Input. Represents the input for the Power-OK behavior. 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
VOUT.
Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor divider tap to this pin. The
output voltage can be adjusted from 1.8 to 3.3V by: VOUT = 0.8V[1 + (R1/R2)]
If the fixed output voltage version is 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: VOUT is out of Regulation
High Level: VOUT is within Regulation
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 VIN. Keep the PCB trace 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 VIN to minimize EMI.
Note: An optional Schottky diode can be connected between this pin and VOUT.
Output Voltage. Bias is derived from VOUT when VOUT exceeds VIN. PCB trace length from VOUT
to the output filter capacitor(s) should be as short and wide as is practical.
Input Voltage. The AS1330 gets its start-up bias from VIN unless VOUT exceeds VIN, in which case
the bias is derived from VOUT. Thus, once started, operation is completely independent from VIN.
Operation is only limited by the output power 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.
www.austriamicrosystems.com/DC-DC_Step-Up/AS1330
Revision 1.06
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