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AS1357-T Datasheet(PDF) 1 Page - ams AG |
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AS1357-T Datasheet(HTML) 1 Page - ams AG |
1 / 10 page AS1357 Programmable Tr iple LDO www.austriamicrosystems.com Revision 1.07 1 - 10 Dat a Sh eet 1 General Description The AS1357 is a high-performance triple CMOS low- dropout voltage regulator in a single QFN package. The efficient set of programmable power supplies is opti- mized to deliver the best compromise between quies- cent current and regulator performance for mobile phones, PDAs, MP3 players, and other battery powered devices. The one-time-programmable (OTP) function provides greater design flexibility by allowing for independent pro- gramming of the output voltage for each regulator on- site. The OTP function allows for fast prototyping reduc- ing development times and costs significant. Factory trimmed versions for full-production are also available. Stability is guaranteed with ceramic output capacitors of only 1µF (±20% – X5R) up to 4.7µF (±20% – X5R). The low equivalent series resistance (ESR) of these capaci- tors ensures low output impedance at high frequencies. Regulation performance is excellent even under low dropout conditions, when the power transistor has to operate in linear mode. The low-noise performance allows direct connection of noise sensitive circuits without additional filtering net- works. The AS1357 is available in a 12-pin QFN 4x4 or 16-pin QFN 3x3 package. Figure 1. Pinout Assignments (Top View) 2 Key Features ! 3 Independent Voltage Regulators with Shutdown ! Output Current: 200mA each LDO ! One Time Programmable Output Voltage (User- or Factory-Trimmed) ! Programmable Output Voltage Range: 1.8 to 3.3V in 0.1V Steps ! Accuracy: ±1.5% ! PSRR: 70dB at 1kHz, 40dB at 100kHz ! Line Regulation: ±2mV ! Load Regulation: ±0.6mV ! Supply Range: 3 to 5.5V ! 0.2V Dropout Voltage @ I = 200mA ! Shutdown Current: ≤1µA ! Supply Current Without Load: 175µA (typ) ! Softstart for Low Inrush Current ! Stable with low ESR Ceramic Capacitors from 1 to 4.7µF ! Low Noise: 40µV rms @10Hz to 100kHz Bandwidth ! Thermal Protection ! Over-Current Protection ! Temperature Range: -40 to +85°C ! Package Types: 12-pin QFN 4x4 and 16-pin QFN 3x3 3 Applications The AS1357 is ideal for cordless and mobile phones, MP3 players, CD and DVD players, PDAs, handheld computers, digital cameras, and any other hand-held battery-powered device. GND VOUT2 VOUT1 EN3 N/C REF 13 6 12 VDD 10 5 14 15 EN1 1 VDD 2 VDD 4 AS1357 16-pin QFN 3x3 VDD 3 VOUT3 7 N/C 8 VDD 9 GND 11 EN2 16 AS1357 12-pin QFN 4x4 GND VOUT3 VOUT2 VOUT1 EN3 N/C REF 10 6 9 (Exposed Pad) VDD 8 N/C 7 5 4 11 12 EN2 1 EN1 2 VDD 3 GND 13 |
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