AS1313 AMSCO
Document overview
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Technical content
[v1-43] 2015-Jul-23 Document Feedback AS1313 Ultra Low Quiescent Current, DC-DC Step Down Converter The AS1313 is an ultra-low quiescent current hysteretic step-down DC-DC converter optimized for light loads and with efficiencies of up to 95%. AS1313 operates from a 2.4V to 5.5V supply and supports output voltages between 1.2V and 3.6V. Besides the available AS1313 standard variants, any variant with output voltages in 50mV steps are available. In order to save power the AS1313 features a shutdown mode, where it draws less than 100nA. During shutdown mode the battery is disconnected from the output. In light load operation, the device enters an idle mode when most of the internal operating blocks are turned off in order to save power. This mode is active approximately 100μs after a current pulse provided that the output is in regulation. The capacitor connected to the REF pin is an essential part of this feature. The AS1313 is available in an 8-pin MLPD (2mm x 2mm) and a 6-pin WL-CSP (0.4mm pitch). Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of AS1313, Ultra Low Quiescent Current, DC-DC Step Down Converter are listed below: Figure 1: Added Value of Using AS1313 Benefits Features Ideal for single Li-Ion battery powered applications • Wide input voltage range (2.4V to 5.5V) Extended battery life • High efficiency up to 95% Less power consumption • Low quiescent current of typ. 1μA
- Low shutdown current of less than 100nA Supports a variety of end applications • Fixed output voltage range (1.2V to 3.6V)
- Output current of 150mA Over–temperature protection and shutdown • Integrated temperature monitoring Cost effective, small package • 6-pin WL-CSP with 0.4mm pitch
- 8-pin MLPD (2mm x 2mm) General Description
Document Feedback [v1-43] 2015-Jul-23 AS1313 − General Description
Applications
The AS1313 is an ideal solution for Li-Ion and coin cell powered devices as:
- Blood glucose meters
- Remote controls
- Hearing aids
- Wireless mouse or any light-load application Block Diagram The functional blocks of this device for reference are shown below: Figure 2: AS1313 Block Diagram Logic PDRV NDRV Ipk Det Zero Cross DetREF Overtemp Shdn Int LDO UVLO OUT GND LX REF EN VIN AS1313 CREF 100nF CIN 22µF L1 6.8µH VOUT VIN 2.4V to 5.5V COUT 22µF ON OFF
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Absolute Maximum Ratings Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under Electrical Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Figure 5: Absolute Maximum Ratings Symbol Parameter Min Max Units Comments Electrical Parameters Supply voltage to ground 5V pins -0.3 7.0 V Applicable for pins: VIN, PWR_VIN, VOUT, EN Supply voltage to ground 5V pins -0.3 VOUT + 0.3 V Applicable for pins: LX, REF Voltage difference between ground terminals -0.3 0.3 V Applicable for pins: GND, PWR_GND, Exposed Pad Input current (latch-up immunity) -100 100 mA Norm: JEDEC JESD78 Electrostatic Discharge V ESD-HBM Human Body Model ±2 kV Norm: JEDEC JESD22-A114F Absolute Maximum Ratings
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Absolute Maximum Ratings Note(s) and/or Footnote(s): 1. Junction-to-ambient thermal resistance is very dependent on application and board-layout. In situations where high maximum power dissipation exists, special attention must be paid to thermal dissipation during board design. 2. The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020 “Moisture/Reflow Sensiti vity Classification for Nonhermetic Solid State Surface Mount Devices” . Temperature Ranges and Storage Conditions θJA (1) Thermal resistance WL-CSP 95 °C/W MLPD 36 °C/W TAMB Operating temperature -40 85 °C TJ Junction temperature WL-CSP 25 °C MLPD 150 °C TSTRG Storage temperature range -55 125 °C TBODY Package body temperature WL-CSP 260 °C Norm IPC/JEDEC J-STD-020 (2) MLPD Norm IPC/JEDEC J-STD-020 (2) The lead for Pb-free leaded packages is matte tin (100% Sn) RH NC Relative humidity non-condensing 58 5 % MSL Moisture sensitivity level WL-CSP 1 Represents an unlimited floor life time MLPD 1 Represents an unlimited floor life time Symbol Parameter Min Max Units Comments
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Electrical Characteristics All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) method. Figure 6:
Electrical Characteristics
Symbol Parameter Conditions Min Typ Max Unit VIN Input voltage VIN, PWR_VIN 2.4 5.5 V VOUT Regulated output voltage 3.6V ≤ VIN ≤ 5.5V (VIN ≥ VOUT + 0.5V) 1.2 3.6 V 2.4V < VIN < 3.6V 1.2 VIN – 0.5V V VOUT_TOL Output voltage tolerance IOUT = 10mA, TAMB = 25°C -3 +3 % IOUT = 10mA -4 +4 % IQ Quiescent current VOUT = 1.03 x VOUTNOM no load, TAMB = 25°C 0.35 1 2 μA ISHDN Shutdown current VEN = 0V TAMB = 25°C 100 nA LNR Output voltage line regulation Vin = 2.4V to 5.5V IOUT = 100mA 0.2 %/V Vin = 3.5V to 5.5V IOUT = 100mA 0.05 %/V LDR Output voltage load regulation IOUT = 0 to 100mA 0.02 %/mA IPK Peak coil current VIN = 3V, TAMB = 25°C VOUT = 0.9 x VOUTNOM 400 mA ILOAD Load current VIN ≥ VOUT + 0.5V 150 mA RPMOS P-Channel FET RDS(ON) ILX = 100mA 0.4 Ω RNMOS N-Channel FET RDS(ON) ILX = -100mA 0.4 Ω
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Electrical Characteristics Electrical Characteristics: Shows the Electrical Characteristics of the DC-DC Converter. VIN = EN = 3.6V, TAMB = –40°C to 85°C (unless otherwise specified). ILX LX leakage VEN = 0V, VLX = 0V or 5V ±0.01 μA VENH logic threshold pin EN 1.2 V VENL 0.2 V IEN EN input bias current EN = 3.6V TAMB = 25°C 100 nA IREF REF input bias current REF = 0.99 x VOUTNOM TAMB = 25°C 100 nA TSHDN Thermal shutdown 150 °C ΔTSHDN Thermal shutdown hysteresis 25 °C Symbol Parameter Conditions Min Typ Max Unit
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Detailed Description The AS1313 is a hysteretic converter and has no continuously operating fixed oscillator, providing an independent timing reference. This means the triggering of the on-off switching of the internal switches depends only on comparators measuring the output voltage and the coil current measurement. This lead to a very low quiescent current. In addition, because there is no fixed timing reference, the operating frequency is determined by external components (inductor and capacitors) and the loading on the output. Ripple at the output is an essential operating behavior. A power cycle is initiated when the output regulated voltage drops below the nominal value of V OUT. Figure 13: Simplified Synchronous Step-Down DC-DC Architecture When SW1 is closed and SW2 is op en, the current is flowing from VIN through the coil to R LOAD. With neglecting the resistive voltage drop over SW1 the voltage across the coil is: Based on the expression, which shows the correlation between voltage across the coil and the coil current, it's easy to rearrange this equation to ge t the coil current I COIL generated while SW1 is closed (t ON). Detailed Description SW2 SW1 FBGND VIN VOUT VCOIL_on VCOIL_off ICOIL_on ICOIL_on ICOIL_off ICOIL_off VIN 0V 0V VOUT CIN COUT RLOAD IPK IZERO VCOIL on– VIN VOUT–= (EQ1) uL di dt----- ICOIL= VIN VOUT– =
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Detailed Description When SW1 is open and SW2 is cl osed, the coil gets discharged, works like a voltage supply and forces the current through RLOAD and SW2. With neglecting the resistive voltage drop over SW2 the voltage across the coil is: Similar to the expression above, the I COIL generated while SW2 is closed (t OFF) can be expressed as: The increasing coil current during the charging (SW1 closed) and the decreasing coil current during the discharging of the coil (SW2 closed) must be the same. Hence, it’s easy to calculate the duty cycle of SW1. Based on the EQ1, the on time of SW1 can be given by: Figure 14: Simplified Voltage and Current Diagram Timing Diagram: This figure shows the relationship between the current and the voltages inside the loop within the switching cycle. VCOIL off– VOUT= (EQ2) ICOIL VOUT (EQ3) ICOIL VIN VOUT– VOUT VOUT VIN == (EQ4) tON L IPK t V I C A BB A D VOUT_nom VIN VCOIL -VOUT VCOIL VIN t ICOIL ILOAD 400mA VIDLE tON tOFF tIDLEtWAIT SW1 on SW2 off SW1 off SW2 on SW1 off SW2 off tON tOFF SW1 on SW2 off SW1 off SW2 on VOUT_ripple
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Detailed Description If the V OUT falls below the V OUT_nom , SW1 closes and the coil current increases until the max. coil current of 400mA is reached. During this time t ON, the VOUT increases. With reaching the 400mA, the switch SW1 open s immediately, the SW2 closes and the coil current decreases down till it reaches the zero line. After this, SW2 opens and if the V OUT is then above the VOUT_nom , no further pulse is needed , both switches remain in their open position, hence no coil current is flowing. In this phase the needed output power only comes out of the C OUT. This time is called t WAIT, which takes ~100us. If the V OUT falls below V OUT_nom within the time t WAIT, the SW1 closes and the charging cycle starts again. If the V OUT is still higher than V OUT_nom after t WAIT is elapsed, then the AS1313 falls into an idle mode, which results in a reduction of the quiescent current. Once, the AS1313 is in this idle mode, the idle-comparator is comparing V OUT with V IDLE (98% of V OUT_nom ) and SW1 closes as soon as the V OUT reaches this threshold.
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Detailed Description External Component Selection Inductors For best efficiency, choose an inductor with high frequency core material, such as ferrite, to reduce core losses. The inductor should have low DCR (DC resistance) to reduce the I²R losses, and must be able to handle the peak inductor current without saturating. A 6.8μH inductor with at least 500mA current rating and DCR of 500mΩ (max) is recommended. Figure 15: Recommended Inductors Part Number L DCR Current Rating Size in mm (L/W/H) Manufacturer ELLVEG6R8N 6.8μH 0.35Ω 0.58A 3x3x1 Panasonic ELLVGG6R8N 6.8μH 0.23Ω 1A 3x3x1.5 LQH3NPN6R8MM0 6.8μH 0.24Ω 1A 3x3x1.4 Murata www.murata.com LQH3NPN6R8NM0 6.8μH 0.24Ω 1A 3x3x1.4 LQH3NPN6R8MJ0 6.8μH 0.252Ω 0.85A 3x3x1.1 LQH3NPN6R8NJ0 6.8μH 0.252Ω 0.85A 3x3x1.1 LQH3NPN6R8MMR 6.8μH 0.186Ω 1.25A 3x3x1.1 VLS2012ET-6R8M 6.8μH 0.498 0.57A 2x2x1.2 TDK www.tdk.com VLS3010ET-6R8M 6.8μH 0.312 0.69A 3x3x1 VLS3012ET-6R8M 6.8μH 0.228 0.81A 3x3x1.2 VLS3015ET-6R8M 6.8μH 0.216 0.92A 3x3x1.5 LPS4018-682ML 6.8μH 0.15 1.2A 4x4x1.7 Coilcraft www.coilcraft.com
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Detailed Description Capacitors The AS1313 requires 3 capacitors. Recommended ceramic X5R or X7R types will minimize ESL and ESR while maintaining capacitance at rated voltage over temperature. The input capacitor supports the triangular current during the on-time of SW1 and maintains a broadly constant input voltage during this time. The capacitance value is obtained from choosing a ripple voltage during the on-time of SW1. Using t ON = 1μs, ICOIL = 400mA and V RIPPLE = 50mV, EQ5 yields: CIN = 8 μF. Because ceramic capacitors lose a lot of their initial capacitance at their maximum rated voltage, it is recommended that either a higher input capacity or a ca pacitance with a higher rated voltage is used. A 22 μF cap for C IN is recommended. Additionally, ripple voltage is generated by the equivalent series resistance (ESR) of the capacitor. The output capacitor supports the triangular current during the off-time SW1 (coil discharge period), and also the load current during the wait time (Region C) and the idle time (Region D). Using t WAIT = 100μs, t IDLE = 500μs, I OUT = 1mA and VOUT_nom = 3.3V, EQ7 yields: COUT = 9 μF. Due to the DC bias of the cap and to sustain also load steps, the COUT should be between 22μF and 47μF. A larger output capacitor should be used if lower peak to peak output voltage ripple is desired. A larger output capacitor will also improve load regulation on V OUT. (EQ5) CIN ICOIL VRIPPLE (EQ6) VRIPPLE ESR– ICOIL RESR⋅= (EQ7) COUT IOUT
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Detailed Description Figure 16: Recommended Input & Output Capacitors For C REF a 100nF cap (X5R or better) is recommended. Part Number C TC Code Voltage Rating Size in mm (L/W/H) Manufacturer GRM21BR60J226ME39L 22μF X5R 6.3V 2x1.25x1.25 Murata 12066D226KAT_A 22μF X5R 6.3V 3.2x1.6x1.78 AVX 1210YD226KAT_A 22μF X5R 16V 3.2x1.6x1.78 C2012X5R0J226K/1.25 22μF X5R 6.3V 2x1.2x1.25 TDK C2012X5R1C226K 22μF X5R 16V 2x1.2x1.25
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Application Information The AS1313 is an ideal solution for Li-ion and coin cell powered devices as blood glucose meters, remote controls, hearing aids, wireless mouse or any light-load application. Figure 17: Typical Application Circuit Typical Application: This figure shows the typical application of the DC-DC Step Down Converter for 8-pin MLPD package and 6-pin WL-CSP .
Application Information
6.8µH CREF 100nF REF VIN GND ON OFF VIN 2.4V to 5.5V AS1313 VOUT 1.2V to 3.6V PWR_VIN PWR_GND 8-pin MLPD COUT 22µFCIN 22µF LX OUTEN 6.8µH COUT 22µFCREF 100nF REF VIN GND ON OFF VIN 2.4V to 5.5V AS1313 VOUT 1.2V to 3.6V 0V0V 6-pin WL-CSP CIN 22µF
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Package Drawings & Markings Figure 18: MLPD-8 2x2 0.5mm Pitch Package Drawing Note(s) and/or Footnote(s): 1. Dimensioning and tolerancing conform to ASME Y14.5M-1994. 2. All dimensions are in millimeters. Angles are in degrees. 3. Coplanarity applies to the exposed heat slug as well as the terminal. 4. Radius on terminal is optional. 5. N is the total number of terminals. Package Drawings & Markings Symbol Min Nom Max A 0.51 0.55 0.60 A1 0.00 0.02 0.05 A3 0.15 REF L 0.225 0.325 0.425 b 0.18 0.25 0.30 D2 . 0 0 B S C E2 . 0 0 B S C e0 . 5 0 B S C D2 1.45 1.60 1.70 E2 0.75 0.90 1.00 aaa - 0.15 - bbb - 0.10 - ccc - 0.10 - ddd - 0.05 - eee - 0.08 - fff - 0.10 -
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Package Drawings & Markings Figure 19: WL-CSP6 0.4mm Pitch Package Drawing Note(s) and/or Footnote(s): 1. ccc Coplanarity. 2. All dimensions are in μm. Top through view Bottom view (ball side)
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Ordering & Contact Information Figure 22:
Ordering Information
Note(s) and/or Footnote(s): 1. Engineering sample quantities are according to customer needs. Buy our products or get free samples online at: www.ams.com/ICdirect Technical Support is available at: www.ams.com/Technical-Support Provide feedback about this document at: www.ams.com/Document-Feedback For further information and requests, e-mail us at: ams_sales@ams.com For sales offices, distributors and representatives, please visit: www.ams.com/contact Headquarters ams AG Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe Tel: +43 (0) 3136 500 0 Website: www.ams.com Ordering Code Marking Output Package Delivery Form Delivery Quantity AS1313-BTDM-18 BT 1.8V MLPD-8lead (2mm x 2mm) Tape & Reel 1000 AS1313-BTDM-30 BV 3.0V MLPD-8lead (2mm x 2mm) Tape & Reel 1000 AS1313-BTDM-33 BU 3.3V MLPD-8lead (2mm x 2mm) Tape & Reel 1000 AS1313-BTDT-ES ES Engineering sample MLPD-8lead (2mm x 2mm) Tray see note (1) AS1313-BWLT-ES ASU8 Engineering sample 6-pin WL-CSP 0.4mm pitch Tray see note (1) AS1313-BWLT-12 ASU9 1.2V 6-pin WL-CSP 0.4mm pitch Tape & Reel 10000 Ordering & Contact Information
Document Feedback [v1-43] 2015-Jul-23 AS1313 − RoHS Compliant & ams Green Statement RoHS: The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specif ied lead-free processes. ams Green (RoHS compliant and no Sb/Br): ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material). Important Information: The information provided in this statement represents ams AG knowledge and belief as of the date that it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are unde rway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to prov ide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. RoHS Compliant & ams Green Statement
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Copyrights & Disclaimer Copyright ams AG, Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Devices sold by ams AG are covered by the warranty and patent indemnification provisions appe aring in its General Terms of Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding th e information set forth herein. ams AG reserves the right to ch ange specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications , such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. This product is provided by ams AG “AS IS” and any express or implied wa rranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed. ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any th ird party shall arise or flow out of ams AG rendering of technical or other services. Copyrights & Disclaimer
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Document Status Document Status Product Status Definition Product Preview Pre-Development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice Preliminary Datasheet Pre-Production Information in this datasheet is based on products in the design, validation or qualification phase of development. The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Datasheet Production Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade Datasheet (discontinued) Discontinued Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade, but these products have been superseded and should not be used for new designs Document Status
[v1-43] 2015-Jul-23 Document Feedback AS1313 − Revision Information Note(s) and/or Footnote(s): 1. Page and figure numbers for the previous version may diff er from page and figure numbers in the current revision. 2. Correction of typographical er rors is not explicitly mentioned. Changes from 1-41 (2013-Oct) to current revision 1-43 (2015-Jul-21) Page 1-41 (2013-Oct) to 1-42 (2014-Jun-12) Content was updated to the latest ams design Updated Figure 22 21 1-42 (2014-Jun-12) to 1-43 (2015-Jul-23) Content was updated to the latest ams design Updated Figure 21 20 Updated Figure 22 21 Revision Information
Document Feedback [v1-43] 2015-Jul-23 AS1313 − Content Guide
1 General Description
1 Key Benefits & Features
2 Applications
2 Block Diagram
3 Pin Assignment
4A b s o l u t e M a x i m u m R a t i n g s