Maker : austriamicrosystems AG
Part No. : AS1344

  Datasheet PDF : AS1344.pdf
  Cross Reference : AS1344 Cross Reference
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Product Information

Datasheet AS1344 www.DataSheet4U.com 4 2 V, D C - D C B o o s t C o n v e r t e r w it h a d j u s ta b l e S o fts ta r t 1 General Description The AS1344 boost converter contains a 1.4A internal switch in a tiny TDFN-10 3x3mm package. The device operates from a 0.9V to 3.6V supply, and can boost voltages up to 42V output. The output voltage can easily be adjusted by an external resistor divider. The AS1344 uses a unique control scheme providing the highest efficiency over a wide range of load conditions. An internal 1.4A MOSFET reduces external component count, and a fixed high switching frequency (1MHz) allows for tiny surface-mount components. The AS1344 also features power-OK circuitry which monitors the output voltage. The device also offers a Softstart function which limits the current during startup. The current during startup can be easily adjusted with the value of RV. For RV = 0Ω, there is no softstart. Additionally the AS1344 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 AS1344 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-10 3x3mm package. 2 Key Features ! ! ! 5.5V to 42V Adjustable Output Voltage 0.9V to 3.6V Supply Voltage Range High Output Current: - 30mA @ 12V VOUT, from 1.5V VCC Efficiency: Up to 85% Switching Frequency: 1MHz Output Disconnect Function Softstart Function with adjustable Current Limit Output Discharge Function Power-OK Output Quiescent Current: 22µA Shutdown Current: 0.1µA TDFN-10 3x3mm Package ! ! ! ! ! ! ! ! ! 3 Applications The device is ideal for OLED display power supply, LCD bias generators, mobile/cordless phones, palmtop computers, PDAs and organizers, handy terminals, driving LEDs or any other portable, battery-powered device. Figure 1. AS1344 - Typical Application Diagram RV VCC = 0.9V to 3.6V CIN VCC R3 POK On Off VCC GND EN FB R2 GND LX L1 VIN SWOUT VOUT D1 VOUT = 5.5V to 42V COUT AS1344 R1 PGND www.austriamicrosystems.com Revision 1.05 1 - 19 AS1344 Datasheet - P i n o u t www.DataSheet4U.com 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) EN 1 POK 2 GND 3 VCC 4 PGND 5 10 FB 9 VOUT AS1344 8 VIN 7 SWOUT 6 LX Pin Descriptions Table 1. Pin Descriptions Pin Number 1 Pin Name EN Description Active-High Enable Input. A logic low on this pin shuts down the device and reduces the supply current to 0.1µA. GND: device in shutdown. VCC : normal operation. Power-OK. 0: VOUT < 90% of VOUTNOM. 1: VOUT > 90% of VOUTNOM. Ground +0.9V to +3.6V Supply Voltage. Bypass this pin to GND with a ≥10µF capacitor. Ground. Should be the starpoint of CIN and COUT. Inductor. The drain of the internal N-channel MOSFET. Note: This pin is high impedance in shutdown. Shutdown Disconnect Switch Out. Disconnects the input from the output during shutdown. Supply Connection. Connect a resistor between pin VIN and pin VCC for limiting the input current during startup. +5.5 to +42V Output Voltage. This pin also powers the AS1344 after startup. Bypass this pin to GND with a ≥4.7µF capacitor. Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor divider tap to this pin. The output voltage can be adjusted from 5.5V to 42V by: VOUT = 1.25V[1 + (R1/R2)] 2 3 4 5 6 7 8 9 10 POK GND VCC PGND LX SWOUT VIN VOUT FB www.austriamicrosystems.com Revision 1.05 2 - 19 AS1344 Datasheet - A b s o l u t e M a x i m u m R a t i n g s www.DataSheet4U.com 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 reliabil...

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