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| 型号： | AS1326B-BTDT |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | DC/DC变换器 |
| 英文描述： | Adj. 650mA, 1MHz, Boost; Package Type: TDFN(3x3)-10; Miscellaneous: Logic-High On |
| 中文描述： | 高电流0.8A的DC - DC升压转换器 |
| 封装： | TDFN(3x3)-10 |
| 文件页数： | 2/18页 |
| 文件大小： | 1108K |
| 代理商： | AS1326B-BTDT |
www.austriamicrosystems.com
Revision 1.05
2 - 18
AS1326
Datasheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
Pin Descriptions
Table 2. Pin Descriptions
Pin Number
Pin Name
Description
1
ISET
N-Channel Current-Limit Control.
For maximum current limit, connect to pin REF.
To reduce current, supply a voltage between pin REF and GND using a resistive
voltage-divider. If soft-start is desired, connect a capacitor from this pin to GND.
1.250V Internal Reference Bypass.
Connect a 10nF ceramic bypass capacitor to
GND. Up to 50μA of external load current is allowed.
Ground.
Connect this pin to PGND using a short trace. The exposed pad can be
used for this routing.
DC-DC Converter Feedback Input.
To set fixed output voltage of +3.3V, connect
this pin to GND. For adjustable output of 2.5 to 5.0V, connect to a resistor-divider
network from pin OUT to GND. The set point for this pin is 1.24V.
IC Power, Supplied from the Output.
Bypass this pin to GND with a 330nF
ceramic capacitor, and connect to POUT with a 10
Ω
series resistor
(see Figure 19
on page 11)
.
Clock Input for the DC-DC Converter.
This pin is also used to program the
operational mode as follows:
0 = Normal operation – the AS1326A operates at a fixed frequency, and switches
into automatic powersave operation if the load is minimized.
1 = Forced-PWM mode – the AS1326A operates in low-noise, constant-frequency
mode at all loads.
Clocked = Forced-PWM mode with the internal oscillator synchronized to this pin in
500 to 1200kHz range.
N-Channel Power MOSFET Switch Source
Inductor Connection
Power Output.
P-channel synchronous rectifier source.
Enable Low (AS1326A
only). Must be connected to GND for normal operation.
0 = The AS1326A is on.
1 = The AS1326A is off.
Enable High (AS1326B
only). Must be connected to OUT for normal operation.
0 = The AS1326B is off.
1 = The AS1326B is on.
Exposed Pad.
This pad is not connected internally. It can be used for ground
connection between GND and PGND.
2
REF
3
GND
4
FB
5
OUT
6
CLK/SEL
7
8
9
PGND
LX
POUT
10
ONN
ON
11
NC
AS1326A/
AS1326B
4
FB
3
GND
2
REF
1
ISET
6 CLK/SEL
7 PGND
9 POUT
10 ONN/ON
5
OUT
8 LX
11
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