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AS1341 PDF даташит

Спецификация AS1341 изготовлена ​​​​«ams» и имеет функцию, называемую «Ultra low Ripple Step Down DC/DC Converter».

Детали детали

Номер произв AS1341
Описание Ultra low Ripple Step Down DC/DC Converter
Производители ams
логотип ams логотип 

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AS1341 Даташит, Описание, Даташиты
AS1341
650mA, Ultra low Ripple Step Down DC/DC Converter
1 General Description
The AS1341 is a high-efficiency step-down converter with adjustable
output voltages from 1.25V to VIN using supply voltages of up to
20V.
An integrated current-limited 0.4MOSFET delivers load currents
up to 600mA.
The AS1341 also includes a 100% duty cycle LDO mode with a low
dropout of only 250mV for high efficiency if input voltages is in the
range of the output voltage.
The AS1341 has a low quiescent current (12µA) to improve light-
load efficiency and minimize battery use, and draws only 0.8µA in
shutdown mode.
High switching frequencies (up to 200kHz) allow the use of small
surface-mount inductors and output capacitors.
The device is available in a TDFN-8 3x3mm pin package.
Figure 1. AS1341 - Typical Application
2 Key Features
Output Voltages: Fixed 5V or Adjustable
Input Voltage Range: 4.5V to 20V
Output Current: Up to 600mA
1.25V Lowest Output Voltage
Efficiency: up to 96%
Quiescent Supply Current: 12µA
Power-OK Output
Internal 0.4P-Channel MOSFET
Shutdown Current: 0.8µA
100% Maximum Duty Cycle for Low Dropout
Current-Limited Architecture
Thermal Shutdown
TDFN-8 3x3mm Package
3 Applications
The device is ideal for notebook computers, distributed power
systems, keep-alive supplies, and any other battery-operated,
portable device.
VIN
4.5V to 20V
CIN
5
IN
7
SHDNN
6
ILIMIT
2
GND
AS1341
4
LX
D1
8
OUT
3
POK
1
FB
L1 VOUT = 5V
+
COUT
RPULL
Indicates High-Power Trace
www.ams.com/DC-DC_Step-Up/AS1341
Revision 1.09
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AS1341 Даташит, Описание, Даташиты
AS1341
Datasheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
FB 1
GND 2
POK 3
LX 4
8 OUT
AS1341
9
7 SHDNN
6 ILIMIT
5 IN
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
1 FB
2 GND
3 POK
4 LX
5 IN
6 ILIMIT
7 SHDNN
8 OUT
9 NC
Description
Feedback Input. For the fixed 5V output connect this pin to GND. For adjustable output, connect to a
resistive divider between VOUT and GND to set the output voltage between 1.25V and VIN.
Ground
Power OK. Active-low open-drain reset output.
Note: Connect pin POK to GND when the Power-Ok feature is not used.
Inductor Connection. Connect this pin to an external inductor.
4.5V to 20V Input Supply Voltage
Peak Current Control Input. Connect this pin to IN or GND to set peak current limit (see Setting
Current Limit on page 11).
Shutdown Input. A low on this pin puts the AS1341 into shutdown mode. Supply current is reduced to
0.8µA and LX goes high-impedance.
Regulated Output Voltage High-Impedance Sense Input. For the fixed 5V output connect this pin to
VOUT. For adjustable output connect this pin to GND.
Exposed Pad. This pad is not connected internally. Connect to GND or do not connect.
www.ams.com/DC-DC_Step-Up/AS1341
Revision 1.09
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AS1341 Даташит, Описание, Даташиты
AS1341
Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Electrical Parameters
Min Max Units
Comments
IN to GND
-0.3 +23
V
LX to GND
-2
VIN
+ 0.3
V
FB to GND
-0.3 +5
V
ILIMIT, SHDNN, OUT, POK to GND
-0.3
VIN
+ 0.3
V
Peak Input Current
Temperature Ranges and Storage Conditions
2A
Thermal Resistance ΘJA
Storage Temperature Range
Junction Temperature
36.3 ºC/W
-55 +150 ºC
+150 ºC
on PCB
Package Body Temperature
Humidity non-condensing
Moisture Sensitive Level
+260
5 85
1
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
ºC Classification for Non-Hermetic Solid State Surface
Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
%
Represents a max. floor life time of unlimited
www.ams.com/DC-DC_Step-Up/AS1341
Revision 1.09
3 - 18










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