AS1340_1 Datasheet, PDF (1/16 Pages) ams AG – 50V, Micropower, DC-DC Boost Converter

Datasheet
AS1340
50V, Micropower, DC-DC Boost Converter
1 General Description
The AS1340 boost converter contains a 1.4A internal
switch in a tiny TDFN-8 3x3mm package. The device
operates from a 2.7 to 5.5V supply, and can boost volt-
ages up to 50V output.
The output voltage can easily be adjusted by an external
resistor divider.
The AS1340 uses a unique control scheme providing
the highest efficiency over a wide range of load condi-
tions. An internal 1.4A MOSFET reduces external com-
ponent count, and a fixed high switching frequency
(1MHz) allows for tiny surface-mount components.
The AS1340 also features power-OK circuitry which
monitors the output voltage.
Additionally the AS1340 features a low quiescent supply
current and a shutdown mode to save power. During
shutdown an output disconnect switch separates the
input from the output.
The AS1340 is ideal for LCD or OLED panels with low
current requirements and can also be used in a wide
range of other applications.
The device is available in a low-profile TDFN-8 3x3mm
package.
2 Key Features
! 2.7V to 50V Adjustable Output Voltage
! 2.7V to 50V Input Voltage Range
! 2.7V to 5.5V Supply Voltage Range
! High Output Currents:
- 100mA @ 12V from 3.3V VIN
- 50mA @ 24V from 3.3V VIN
- 30mA @ 36V from 3.3V VIN
! Efficiency: Up to 93%
! Switching Frequency: 1MHz
! Output Disconnect
! Power-OK Output
! Operating Supply Current: 30µA
! Shutdown Current: 0.1µA
! TDFN-8 3x3mm Package
3 Applications
The device is ideal for OLED display power supply, LED
power supply, LCD bias generators, mobile/cordless
phones, palmtop computers, PDAs and organizers,
handy terminals or any other portable, battery-powered
device.
Figure 1. AS1340 - Typical Application Diagram
L1
L1
4.7µH
VIN = 2.7V
to 5.5V
CIN
On
Off
3
6
VIN = 2.7V
to 5.5V
3
6
SWVIN
SWOUT
VOUT = > VIN to 50V
VCC
LX
2
5
VCC
LX
4
AS1340
R1
8
COUT
VIN = 2.7V
to ~VOUT
L1
POK
1
EN
FB
R2
7, 9
GND
VIN = 2.7V
3
to 5.5V
VCC
6
LX
VOUT
VOUT
If not needed the output disconnect switch can be left unconnected which will also increase the efficiency.
Additionally the supply of the chip can be split to allow higher supply voltages for the coil. In this case the output disconnect switch must not be used.
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