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AS1337 Datasheet(PDF) 2 Page - ams AG

Part # AS1337
Description  200mA, DC-DC Step-Up Converter with Buck Mode
Download  14 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1337 Datasheet(HTML) 2 Page - ams AG

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www.austriamicrosystems.com/DC-DC_Step-Up/AS1337
Revision 1.04
2 - 14
AS1337
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
Table 2. Pin Descriptions
Pin Name
Pin Number
Description
VOUT
1
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.
LX
2
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 100
Ω 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.
PGND
3
Power Ground. Provide a short, direct PCB path between this pin and the out-
put capacitor(s).
GND
4
Ground
EN
5
Enable Pin. Logic controlled enable input.
1 = Normal operation
0 = Shutdown
Note: In a typical application, EN should be connected to VIN through a 1M
Ω
pull-up resistor.
POK
6
POK. High when VOUT is within regulation.
VIN
7
Input Voltage. The AS1337 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.
FB
8
Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor
divider tap to this pin. The output voltage can be adjusted from 2.5V to 5V by:
VOUT = 1.23V[1 + (R1/R2)]
GND
9
Exposed Pad Ground
5 EN
3
PGND
2
LX
1
VOUT
6POK
7VIN
8FB
AS1337
4
GND
9GND


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