AS1335 查看數據表（PDF） - austriamicrosystems AG
零件编号
产品描述 (功能)
生产厂家
AS1335 Datasheet PDF : 19 Pages
| |||
AS1335
Datasheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
VIN 1
NC 2
lid EN 3
POK 4
a GND 5
10 SW
AS1335
9 PGND
8 GND
7 FB
11 6 RSI
v Pin Descriptions
ill Table 1. Pin Descriptions
Pin
t Number
Pin Name
Description
G s 1
VIN
Positive Supply Voltage. This pin must be closely decoupled to PGND with a ≥ 22µF
ceramic capacitor.
A t 2
NC Not Connected.
Enable Input. Driving this pin above 1.4V enables the device. Driving this pin below 0.3V
s n puts the device in shutdown mode. In shutdown mode all functions are disabled, drawing
3
EN
≤1µA supply current.
e Note: This pin should not be left floating.
m t Power-OK Output. Open-drain output with 215ms delay. Connect a 100kΩ pull-up resistor
to VOUT or pin VIN for logic levels. Leave this pin unconnected if the Power-OK feature is
a n 4
POK not used.
LOW Signal: Out of regulation
o HIGH signal: Within Regulation (after 215ms delay)
5
GND Analog Ground.
c Reset Input for POK. This input resets the 215ms timer of the POK signal.
As long as RSI is low the POK signal will work as described above.
l A high input to RSI will reset the 215ms POK timer and delay the signal as long as RSI
6
RSI stays high. A RSI low-to-high transition restarts the 215ms counter as long as the output
a voltage is within regulation.
ic Note: Do not leave this pin floating.
Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor divider tap to
n 7
FB
this pin. The output can be adjusted from 0.6V to 5.25V by VOUT = 0.6V[1+(R1/R2)].
If the fixed output voltage version is used, connect this pin to VOUT.
h 8
GND Analog Ground. GND and PGND should only have one point connection.
9
PGND Power-Ground. Connect all power grounds to this pin.
ec 10
SW
Switch Node Connection to Inductor. This pin connects to the drains of the internal main
and synchronous power MOSFET switches.
T11
Exposed Pad. The exposed pad must be connected to PGND. Ensure a good connection
to the PCB to achieve optimal thermal performance.
www.austriamicrosystems.com/DC-DC_Step-Down/AS1335
Revision 1.03
2 - 18
Share Link: 