General Description AS1323 high-efficiency step-up DC-DC converte

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General Description AS1323 high-efficiency step-up DC-DC converte

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AS1323
General Description
AS1323 high-efficiency step-up DC-DC converter designed specifically single-cell, battery-powered devices where lowest quiescent current high efficiency essential. compact device available three fixed-voltage variations perfect wide variety applications where extremely-low quiescent currents very-small form factors critical. devices available standard products shown Table also Ordering Information page Table Standard Products Model AS1323-27 AS1323-30 AS1323-33 Fixed Output Voltage 2.7V 3.0V 3.3V Package TSOT23-5 TSOT23-5 TSOT23-5
Features
1.6µA Quiescent Current Input Voltage Range: 0.75 100mA Output Current Fixed Output Voltages: 2.7, 3.3V Shutdown Current: 0.1µA Output Voltage Accuracy: Efficiency: External Diode FETs Needed Output Disconnect Shutdown Guaranteed 0.95V Start-Up Voltage TSOT23-5 Package
Integrated boot circuitry ensures start-up even with veryhigh load currents. true output disconnect feature completely disconnects output from battery during shutdown. device available TSOT23-5 package.
Applications
devices ideal single-cell portable devices including mobile phones, players, PDAs, remote controls, personal medical devices, wireless transmitters receivers, other battery-operated, portable device.
Figure Typical Operating Circuit
10µH
VBATT 10µF
VBATT
AS1323
SHDNN
AS1323
VOUT 10µF SHDNN VOUT
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AS1323
Data Sheet
Pinout
Assignments
Figure Assignments (Top View)
VBATT
AS1323
SHDNN
VOUT
Descriptions
Table Descriptions Number Name VBATT SHDNN VOUT Description Battery Supply Input Coil Connection Negative Supply Ground Shutdown Input. Shutdown mode. Normal operating mode. Output. This also supplies bootstrap power device. Inductor Connection. This connected internal N-channel MOSFET switch drain P-channel synchronous rectifier drain.
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AS1323
Data Sheet
Absolute Maximum Ratings
Stresses beyond those listed Table cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated Electrical Characteristics page implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Table Absolute Maximum Ratings Parameter VBATT, SHDNN, Maximum Current VOUT, Thermal Resistance Electro-Static Discharge Operating Temperature Range Storage Temperature Range Junction Temperature -0.3 207.4 +150 +150 Units reflow peak soldering temperature (body temperature) specified accordance with IPC/JEDEC J-STD-020C "Moisture/Reflow Sensitivity Classification Non-Hermetic Solid State Surface Mount Devices". lead finish Pb-free leaded packages matte (100% Sn). Comments
Package Body Temperature
+260
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AS1323
Data Sheet
Electrical Characteristics
Electrical Characteristics
TAMB -40°C +85°C, VBATT 1.2V, VOUT VOUT(NOM), SHDNN VOUT, RLOAD unless otherwise noted. Typical values 25°C.(unless otherwise specified). Limits 100% production tested TAMB Limits over operating temperature range guaranteed design. Table Electrical Characteristics Symbol VINMIN VINSU Parameter Minimum Input Voltage Operating Input Voltage Minimum Start-Up Input Voltage TAMB TAMB RLOAD AS1323-27 VOUT Output Voltage AS1323-30 AS1323-33 RLOAD RDS-ON ILIMIT Load depended drop VOUT N-Channel On-Resistance P-Channel On-Resistance N-Channel Switch Current Limit Switch Maximum On-Time Synchronous Rectifier Zero-Crossing Current IOP-OUT IQ-OUT IQ-BAT ISDI-OUT ISDI-BAT ISDI
Condition
0.75
Unit
0.95 0.75 2.619 2.91 3.201 0.75
0.95 2.781 3.09 3.399
VBATT 1.5V; ILOAD 45mA
Programmed 400mA
Operating Current into VBATT Quiescent Current VOUT Quiescent Current into VBATT Shutdown Current VOUT Shutdown Current into VBATT SHDNN Voltage Threshold, SHDNN Voltage Threshold, High
VBATT 1.5V, VOUT 3.3V, TAMB
VBATT 1.5V, TAMB
VBATT 1.5V, TAMB
SHDNN Input Bias Current TAMB VSDI VOUT
VOUT completely disconnected (0V) during shutdown.
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AS1323
Data Sheet
Typical Operating Characteristics
VOUT= 3.3V; 25°C; COUT 10µF, 10µH, ILOAD 10mA; VBATT 1.5V; unless otherwise specified. Figure Efficiency Output Current; VOUT 3.3V
1.8V
Figure Efficiency Output Current; VOUT 3.0V
1.8V
1.2V
1.5V
Efficiency
Efficiency
1.5V
0.95V
1.2V 0.95V
Output Current (mA) Figure Efficiency Output Current; VOUT 2.7V
1.8V
Output Current
Figure Efficiency Input Voltage
1.5V
Efficiency
1.2V 0.95V
Efficiency
0.75
80µA 800µA 11mA
1.25
1.75
Output Current
Figure Output Voltage Temperature
3.32 3.315
Load
Input Voltage
Figure Output Voltage Output Current
3.35
1.5V 1.2V
Output Voltage
3.31 3.305 3.295 3.29
ILOAD 30mA ILOAD 10mA
Output Voltage
3.25 3.15 3.05
3.285 3.28
perature (°C)
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Output Current
AS1323
Data Sheet
Figure Output Voltage Input Voltage
3.38
Figure Shutdown Current Temperature
1000
Output Voltage
Input Current (nA)
3.36 3.34 3.32 3.28 3.26 3.24 3.22
1.5V
1.2V
Input Voltage
perature (°C)
Figure Minimum Input Startup Votage Temperature
Figure Output Voltage Input Voltage; VOUT 2.7V
2.78 2.76
Output Voltage
Input Voltage
2.74 2.72 2.68 2.66 2.64
IOUT IOUT 10mA IOUT 30mA
2.62 0.75
1.25
1.75
perature (°C)
Figure Output Voltage Input Voltage; VOUT 3.0V
3.08
Input Voltage
Figure Output Voltage Input Voltage; VOUT 3.3V
3.38
Output Voltage
3.04 3.02 2.98 2.96 2.94 2.92 0.75
IOUT IOUT 10mA
Output Voltage
3.06
3.36 3.34 3.32 3.28 3.26 3.24 3.22
IOUT 30mA IOUT IOUT 10mA
IOUT 30mA
1.25
1.75
0.75
1.25
1.75
Input Voltage
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Input Voltage
AS1323
Data Sheet
Figure Output Current Input Voltage
Figure
Switching Waveform; VOUT 2.7V
Output Current (mA)
VOUT 3.0V
VOUT 3.3V
VOUT
0.75
VOUT 2.7V
1.25
1.75
200µs/Div
Input Voltage
Figure Switching Waveform; VOUT 3.0V
Figure Switching Waveform; VOUT 3.3V
50mV/Div
2V/Div
20mA/DIV
200µs/Div
200µs/Div
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20mA/DIV
2V/Div
50mV/Div
VOUT
VOUT
20mA/DIV
2V/Div
50mV/Div
AS1323
Data Sheet
Detailed Description
AS1323 compact, high-efficiency, step-up DC-DC converter guaranteed start with voltages 0.95V, operate with input voltage down 0.75V. Consuming only 1.6µA quiescent current, device includes integrated synchronous rectifier that eliminates need external diode improves overall efficiency minimizing losses (see Synchronous Rectification page AS1323 also features active-low shutdown circuit that supply current 0.1µA. Figure Block Diagram
VOUT Comparator Discharge Comparator Voltage COUT
0.95 1.6V
VBATT
SHDNN
AS1323
Control Logic Startup System Timing
Comparator Charge
Control
forced discontinuous, current-limited, pulse-frequency modulation (PFM) control scheme provides ultra-low quiescent current high efficiency over wide output current-range. Rather than using integrated oscillator, inductor current limited 400mA N-channel current limit switch maximum on-time. After each device-on cycle, inductor current must ramp zero before another cycle start. When error comparator senses that output fallen below regulation threshold, another cycle begin.
Synchronous Rectification
integrated synchronous rectifier eliminates need external Schottky diode, reducing cost space. During normal operation, while inductor discharges, P-channel MOSFET turns shunts MOSFET body diode. Consequently rectifier voltage drop significantly reduced improving efficiency without need external components.
Low-Voltage Startup Circuit
AS1323 contains unique low-voltage startup circuit which ensures start-up even with very high load currents. minimum start-up voltage independent load current. This device powered from VBATT, guaranteeing startup input voltages 0.95V.
Shutdown
AS1323 enter shutdown when SHDNN driven low. During shutdown, output completely disconnected from battery. Shutdown pulled high 3.6V, regardless voltage pins VBATT VOUT. normal operation, connect SHDN input.
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AS1323
Data Sheet
Application Information
Figure Typical Application
10µH
VBATT 10µF
AS1323
SHDNN
VOUT 10µF
Inductor Selection
control scheme AS1323 allows wide range inductor values. 10µH inductor should sufficient most applications (see Figure 20). Smaller inductance values typically offer smaller physical size given series resistance, allowing smallest overall circuit dimensions. Applications using larger inductance values startup lower battery voltages, provide higher efficiency exhibit less ripple, they reduce maximum output current. This occurs when inductance sufficiently large prevent maximum current limit (ILIMIT) from being reached before maximum on-time (tON) expires (see Electrical Characteristics page maximum output current, inductor value should chosen such that controller reaches current-limit before maximum on-time triggered:
BATT LIMIT
tONMAX (typ). ILIMIT 400mA (typ). larger inductor values, peak inductor current (IPEAK) determined
inductor's incremental saturation current rating should greater than peak switching current. However,
BATT PEAK generally advisable bias inductor into saturation much 20%, although this will slightly reduce efficiency.
Maximum Output Current
maximum output current (IOUTMAX) function IPEAK, VIN, VOUT, overall efficiency indicated formula determining IOUTMAX: BATT OUTMAX PEAK
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AS1323
Data Sheet
Capacitor Selection
Choose input output capacitors supply input output peak currents with acceptable voltage ripple. input filter capacitor (CIN) reduces peak currents drawn from battery improves efficiency. equivalent series resistance (ESR) capacitors recommended. Note: Ceramic capacitors have lowest ESR, tantalum polymer capacitors offer good balance between cost performance. Output voltage ripple components: variations charge stored output capacitor with each COIL pulse, voltage drop across capacitor's caused current into capacitor: VRIPPLE VRIPPLE(C) VRIPPLE(ESR) VRIPPLE(ESR) IPEAK RESR(COUT)
RIPPLE PEAK BATT
Where: IPEAK peak inductor current. ceramic capacitors, output voltage ripple typically dominated VRIPPLE(C). example, 10µF ceramic capacitor 10µH inductor typically provide 75mV output ripple when stepping from 1.2V 3.3V 50mA. input-to-output voltage differences require higher output capacitor values. Capacitance variation temperature should considered best performance applications with wide operating temperature ranges.
Board Layout Considerations
AS1323 been specially designed tolerant board parasitic inductances resistances. However, achieve maximum efficiency careful board layout component selection vital. Note: optimal performance IC's ground leads input output capacitors must kept less than apart using ground plane. addition, keep connections COIL short possible. system robustness guarantees reliable operation even those recommendations fully applied.
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AS1323
Data Sheet
Package Drawings Markings
device available TSOT23-5 package. Figure TSOT23-5 Package
Symbol Notes:
0.01 0.84 0.30 0.31 0.12 0.08
0.05 0.87 0.35 0.15 0.13 2.90BSC 2.80BSC 1.60BSC 0.95BSC 1.90BSC
1.00 0.10 0.90 0.45 0.39 0.20 0.16
Notes
Symbol
0.30
0.40 0.60REF 0.25BSC
0.50
Notes
0.10 0.10
0.25
Tolerances Form Position 0.15 0.25 0.10 0.20
Dimensioning tolerancing conform ASME Y14.5M 1994. Dimensions millimeters. Dimension does include mold flash, protrusions, gate burrs. Mold flash, protrusions, gate burrs shall exceed 0.15mm end. Dimension does include interlead flash protrusion. Interlead flash protrusion shall exceed 0.15mm side. Dimensions determined datum package smaller than package bottom. Dimensions determined outermost extremes plastic body exclusive mold flash, burrs, gate burrs, interlead flash, include mistmatches between package body bottom. determined datum
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AS1323
Data Sheet
Tape Reel Pin1 Orientation
Figure Tape&Reel Pin1 Orientation
Top, Through View
User direction feed
TSOT23-5
TSOT23-5
TSOT23-5
TSOT23-5
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AS1323
Data Sheet
Ordering Information
device available standard products shown Table Table Ordering Information Model AS1323-BTTT-27 AS1323-BTTT-30 AS1323-BTTT-33 Marking ASJN ASMP ASMQ Output 2.7V 3.0V 3.3V Description 1.6µA Quiescent Current, Single Cell, DC-DC Step-up Converter 1.6µA Quiescent Current, Single Cell, DC-DC Step-up Converter 1.6µA Quiescent Current, Single Cell, DC-DC Step-up Converter Delivery Form Tape Reel Tape Reel Tape Reel Package TSOT23-5 TSOT23-5 TSOT23-5
devices RoHS compliant free halogene substances.
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AS1323
Data Sheet
Copyrights
Copyright 1997-2009, austriamicrosystems Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered rights reserved. material herein reproduced, adapted, merged, translated, stored, used without prior written consent copyright owner. products companies mentioned trademarks registered trademarks their respective companies.
Disclaimer
Devices sold austriamicrosystems covered warranty patent indemnification provisions appearing Term Sale. austriamicrosystems makes warranty, express, statutory, implied, description regarding information forth herein regarding freedom described devices from patent infringement. austriamicrosystems reserves right change specifications prices time without notice. Therefore, prior designing this product into system, necessary check with austriamicrosystems current information. This product intended normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, high reliability applications, such military, medical life-support lifesustaining equipment specifically recommended without additional processing austriamicrosystems each application. shipments less than parts manufacturing flow might show deviations from standard production flow, such test flow test location. information furnished here austriamicrosystems believed correct accurate. However, austriamicrosystems shall liable recipient third party damages, including limited personal injury, property damage, loss profits, loss use, interruption business indirect, special, incidental consequential damages, kind, connection with arising furnishing, performance technical data herein. obligation liability recipient third party shall arise flow austriamicrosystems rendering technical other services.
Contact Information
Headquarters austriamicrosystems A-8141 Schloss Premstaetten, Austria Tel: 3136 Fax: 3136
Sales Offices, Distributors Representatives, please visit:
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General Description AS1323 high-efficiency step-up DC-DC converte

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