Dat a Sh eet AS1352 Programmable Quad LDO 1 General Description 2 Key Features 4 Independent Voltage Regulators with Shutdown The AS1352 is a high-performance quad CMOS low- dropout voltage regulator in a single QFN package. The Output Current: 200mA each LDO efficient set of programmable power supplies is opti- One Time Programmable Output Voltage mized to deliver the best compromise between quies- (User- or Factory-Trimmed) cent current and regulator performance for mobile Programmable Output Voltage Range: 1.8 to 3.3V in phones, PDAs, MP3 players, and other battery powered 0.1V Steps devices. Accuracy: 2% The one-time-programmable (OTP) function provides PSRR: 70dB at 1kHz, 40dB at 100kHz greater design flexibility by allowing for independent pro- Line Regulation: 2mV gramming of the output voltage for each regulator on- Load Regulation: 0.6mV site. The OTP function allows for fast prototyping reduc- Supply Range: 3 to 5.5V ing development times and costs significant. Factory 0.2V Dropout Voltage I = 200mA trimmed versions for full-production are also available. Shutdown Current: 1A Stability is guaranteed with ceramic output capacitors of Supply Current Without Load: 225A only 1F (20% X5R) up to 4.7F (20% X5R). The Softstart for Low Inrush Current low equivalent series resistance (ESR) of these capaci- tors ensures low output impedance at high frequencies. Stable with Low ESR Ceramic Capacitors from 1 to 4.7F Regulation performance is excellent even under low Low Noise: 40V rms 10Hz to 100kHz Bandwidth dropout conditions, when the power transistor has to operate in linear mode. Thermal Protection Over-Current Protection The low-noise performance allows direct connection of noise sensitive circuits without additional filtering net- Temperature Range: -40 to +85C works. Package Types The AS1352 is available in a 12-pin QFN 4x4 package - 12-pin QFN 4x4 and a 16-pin QFN 3x3 package. - 16-pin QFN 3x3 3 Applications The AS1352 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. Figure 1. Pinout Assignments (Top View) EN3 EN4 REF EN2 EN3 EN4 REF 12 11 10 16 15 14 13 EN1 1 12 GND EN2 GND 1 9 VDD GND 2 11 AS1352 AS1352 12-pin QFN 16-pin QFN EN1 2 8 VDD 4x4 3x3 VDD VDD 3 10 VDD 3 7 VOUT4 VDD VDD 4 9 13 GND 4 5 6 5 6 7 8 (Exposed Pad) VOUT1 VOUT2 VOUT3 VOUT1 VOUT2 VOUT3 VOUT4 www.austriamicrosystems.com Revision 1.31 1 - 10AS1352 Data Sheet - Pinout 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View Not To Scale) EN3 EN4 REF EN2 EN3 EN4 REF 12 11 10 16 15 14 13 EN1 GND 1 12 EN2 GND 1 9 VDD 2 11 GND AS1352 AS1352 12-pin QFN 16-pin QFN EN1 VDD 2 8 4x4 3x3 VDD VDD 3 10 VDD VOUT4 3 7 VDD VDD 4 9 13 GND 4 5 6 5 6 7 8 (Exposed Pad) VOUT1 VOUT2 VOUT3 VOUT1 VOUT2 VOUT3 VOUT4 Pin Descriptions Table 1. Pin Descriptions 12-pin QFN 4x4 16-pin QFN 3x3 Pin Name Description Pin Number Pin Number 21 EN1 VOUT1 Digital Input Enable 116 EN2 VOUT2 Digital Input Enable 12 15 EN3 VOUT3 Digital Input Enable 11 14 EN4 VOUT4 Digital Input Enable Negative Supply Voltage. 9 11, 12 GND Note: All GND pins must be connected together externally. Negative Supply Voltage. This pin is the exposed pad. 13 - GND Note: All GND pins must be connected together externally. Analog Reference Voltage. 10 13 REF Note: Connect to 100nF capacitor during normal operation. Positive Supply Voltage. 3, 8 2, 3, 4, 9, 10 VDD Note: All VDD pins must be connected together externally. 45 VOUT1 Regulated Analog Output Voltage 1 56 VOUT2 Regulated Analog Output Voltage 2 67 VOUT3 Regulated Analog Output Voltage 3 78 VOUT4 Regulated Analog Output Voltage 4 www.austriamicrosystems.com Revision 1.31 2 - 10