AP1603

AP1603

Document overview

• Manufacturer or author: Diodes Incorporated
• PDF pages: 8

Technical content

Features

• A Guaranteed Start-Up from less than 0.9 V
• High Efficiency
• Low Quiescent Current
• Less Number of External Components needed
• Low Ripple and Low Noise
• Space Saving Lead Free Package: SOT26
• Available in Green molding
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3) Pin Assignments 3 74 LX GND OUT REF SOT26 AP1603 5 SHDNFB ( Top View )

Applications

• Pagers
• Cameras
• Wireless Microphones
• Pocket Organizers
• Battery Backup Suppliers
• Portable Instruments Notes: 1. No purposely added lead. Fully EU Directiv e 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more in formation about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Typical Applications Circuit (1) VOUT = 5V SHDN LX OUT REF 0.1uF 22uH 47uF 47uF +VIN ON OFF Fixed Output ( 5V ) GND 1.1V to 5.5V FB

Document number: DS31131 Rev. 4 - 2 2 of 8 www.diodes.com February 2014 © Diodes Incorporated AP1603 Typical Applications Circuit (cont.) (2) VOUT = 3.3V SHDN LX OUT REF 0.1uF 22uH 47uF+ 47uF +VIN ON OFF Fixed Output ( 3.3V ) GND 1.1V to 3.6V FB (3) VOUT = ADJ SHDN LX OUT REF 0.1uF 22uH 47uF 47uF +VIN ON OFF Output GND 1.1V to 5.5V FB R2 VOUT = V REF (1+ )R1 Pin Descriptions Pin Name Function FB Feedback. GND Ground. REF 1.2V Reference Voltage. Bypass with a 0.1 μF capacitor. LX N-Channel and P-Channel Power MOSFET Drain. OUT Power Output. OUT provides bootstrap power to the IC. SHDN Shutdown Input. Drive high (>80% of VOUT) for operating mode. Drive low (<20% of VOUT) for shutdown mode. Connect to OUT for normal operation. Functional Block Diagram S QR F/F TRIG One-Shot Q One-Shot QTRIG Maximum On-Time One-Shot Current-Limit Amplifier Zero Crossing Amplifier Minimum Off-Time One-Shot + - + - LX 0.1uF 22uH 0.1uF 47uF 47uF P N VIN EN + - Error Amplifier FB connects to external feedback resistors FB connects to Vcc or GND FB VOUT GND SHDN

Document number: DS31131 Rev. 4 - 2 3 of 8 www.diodes.com February 2014 © Diodes Incorporated AP1603 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) Symbol Parameter Rating Unit VCC Supply Voltage (OUT to GND) -0.3 to 5.5 V VREF REF to GND -0.3 to VOUT +0.3 V VSW Switch Voltage (LX to GND) -0.3 to VOUT +0.3 V IOUT Output Current (OUT) -0.8 to 0.2 A ISW Switch Current (LX) -0.8 to 0.2 A TST Storage Temperature Range -65 to +150 °C TOP Operation Temperature Range -40 to +85 °C Electrical Characteristics (VIN =2V, FB =VOUT, RL =∞, TA = 0°C to +85°C, unless otherwise specified. Typical Values @ TA = +25°C) Symbol Parameter Conditions Min Typ Max Unit Minimum Input Voltage — 0.9 — V VIN Operating Voltage TA = +25°C 1.1 — 5.5 V Start-Up Voltage TA = +25°C, RL = 3kΩ (Note 4) — 0.9 1.1 V Start-Up Voltage Tempco — -4 — mV/°C Output Voltage Range 2 — 5.5 V IOUT Steady-State Output Current (Note 5) FB = VOUT = 3.3V 100 150 — mA VIN = 2.4V, FB = GND, VOUT = 5V — 80 — VREF Reference Voltage IREF = 0 1.196 1.22 1.244 V VOUT Output Voltage FB = VOUT 3.17 3.3 3.43 V FB = GND 4.8 5 5.2 TEMPCO Reference Voltage Tempco — 0.05 — mV/°C VREF_LOAD Reference Voltage Load Regulation IREF = 0 to 20μA — 15 80 mV VREF_LINE Reference Voltage Line Regulation VIN = 1.1V to 3.6V — 0.08 1.5 mV/V RDS (ON) Internal NFET, PFET On-Resistance ILX = 100mA — 0.6 1.0 Ω ILIM LX Switch Current Limit (NFET) 0.3 0.35 0.4 A ILEAK LX Leakage Current VLX = 0, 5.5V; VOUT = 5.5V — 0.05 1 µA Operating Current into OUT VOUT = 3.3V — 16 35 µA Shutdown Current into OUT SHDN = GND — 0.1 1 µA Efficiency VOUT = 3.3V, ILOAD = 100mA — 90 — % tON LX Switch On-Time 3 4 7 µs tOFF LX Switch Off-Time 1.0 1.2 1.4 µs ISHDN SHDN Input Current VSHDN = 0 or VOUT — 0.07 50 nA VIL SHDN Input Voltage Based on VOUT Voltage — — 0.2 VOUT VIH 0.8 — — Notes: 4. Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 external diode between the input and output. 5. Steady-state output current indicates that the device maintains output voltage regulation under load.

Document number: DS31131 Rev. 4 - 2 4 of 8 www.diodes.com February 2014 © Diodes Incorporated AP1603 Typical Performance Characteristics Reference Voltage vs . Temperature 1.18 1.19 1.20 1.21 1.22 1.23 - 4 0 - 2 00 2 04 06 08 0 Temperature (°C) Reference Voltage (V) Steady Stage Output Current vs. Input Voltage 160 240 320 400 Input Voltage (V) Steady Stage Output Current (mA) Start-up Voltage vs . Load Current 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 3 9 1 83 95 97 99 9 Load Current (mA) Start-up Voltage (V) w ith diode w ithout diode 1N5819 100 125 150 175 No Load Input Current (uA)Input Voltage (V) No Load Input Current vs. Input Voltage

Document number: DS31131 Rev. 4 - 2 5 of 8 www.diodes.com February 2014 © Diodes Incorporated AP1603 Typical Performance Characteristics (cont.) Efficiency vs. Load Current 2.89 7.94 17.86 27.937. 47. 57. 67.9 77.6 87. 97. Load Current (mA) Efficiency (%) VIN = 1.2V VOUT = 3.3V Efficiency vs. Load Current 2.91 27. 57.9 87. 117. 147. 177.5 208 238 268 298 Load Current (mA) Efficiency (%) VIN = 2.4V VOUT = 3.3V Shoutdown Current vs. Supply Voltage -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1234 Supply Voltage (V) Shutdown Current (uA) Shutdown Threshold Voltage 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Supply Voltage (V) Shutdown Threshold Voltage (V)

Document number: DS31131 Rev. 4 - 2 6 of 8 www.diodes.com February 2014 © Diodes Incorporated AP1603 Function Description General Description AP1603 PFM (Pulse Frequency Modulation) converte r IC series combine a switch mode converter, power MOSFET, and precision voltag e reference in a single monolithic device. They offer both extrem e low quiescent current, high efficiency, and very low gate thre shold voltage to ensure start-up with low battery voltage (0.9V typ.). Designed to maximize battery life in portable products, and minimize swit ching losses by only switching as needed to service the load. PFM converters trans fer a discrete amount of energy per cycle and regulate the output voltage by modulating switching frequency with the constant turn-on ti me. Switching frequency depends on the load, input voltage, and indu ctor value, and it can range up to 150kHz. The SW on resistance is typically 1 to 1.5 W to minimize sw itch losses. When the output voltage drops, the error comparator enables 150kHz oscillator that turns on the MOSFET around 7.5us and 2.5ms off time. Turning on the MOSFET allows ind uctor current to ramp up, storing energy in a magnetic field and when MOSFET turns off that force inductor current through the diode to the o utput capacitor and load. As the stored energy is depleted, the current ramp down until the diode turns off. At this point, inductor may ring due t o residual energy and stray capacitance. The output capacitor stores charge when curr ent flow through the diode is high, and release it when the curr ent flow is low, thereby maintaining a steady voltage across the load. As the load increases, the output capacitor discharges faster and the err or comparator initiates cycles sooner, increasing the switching frequency. The maximum duty cycle ensures adequate time for energy transfer t o output during the second half of each cycle. Depending on the circuit, PFM converter can operate in ei ther discontinuous mode or continuous condu ction mode. Continuous conduction mode means that the inductor current does not ramp to zero during each cycle. Inductor Selection To operate as an efficient energy transfe r element, the inductor must fulfill three r equirements. First, the inductance must be low enough for the inductor to store adequate energy under the worst-case condition of minimum input voltage and switch ON time. Second, the induc tance must also be high enough so the maximum current rating of AP1603 and inductor ar e not exceeded at the other worst-case condition of maxim um input voltage and ON time. Lastly, the inductor must have sufficiently low DC resistance so exce ssive power is not lost as heat in th e windings. But unfortunately this is inversely related to physical size. Minimum and Maximum input voltage, output voltage and output current must be established before an inductor can be selected. Capacitor Selection A poor choice for an output capacitor can result in poor efficien cy and high output ripple. Ordi nary aluminum electrolytic capa citors, while inexpensive, may have unacceptably poor ESR and ESL. There is a low ESR aluminum capacitor for swit ch mode DC-DC converters whi ch work much better than the general purpose unit. Tantalum capacitors provide still better performance at more expense. OS-CON capacit ors have extremely low ESR in a small size. If capacitance is reduced, the output ripple will increase. Most of the input supply is supplied by the input bypass capacitor. The capacitor voltage rating should be at least 1.25 times greater than a maximum input voltage.

Ordering Information

Part Number Package Code Packaging 7” Tape and Reel Quantity Part Number Suffix AP1603WG-7 W SOT26 3000/Tape & Reel -7

Document number: DS31131 Rev. 4 - 2 7 of 8 www.diodes.com February 2014 © Diodes Incorporated AP1603 Marking Information (1) SOT26 1 2 3 XX Y W X ( Top View ) XX : Identification code Y : Year 0~9 W : Week : A#Z : 1~26 week a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green Part Number Package Identification Code AP1603W SOT26 EY Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. SOT26 Dim Min Max Typ A 0.35 0.50 0.38 B 1.50 1.70 1.60 C 2.70 3.00 2.80 D ⎯ ⎯ 0.95 H 2.90 3.10 3.00 J 0.013 0.10 0.05 K 1.00 1.30 1.10 L 0.35 0.55 0.40 M 0.10 0.20 0.15 α 0° 8° ⎯ All Dimensions in mm Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y 0.80 C1 2.40 C2 0.95 A M J LD B C H K X Z Y C2C2 G

Document number: DS31131 Rev. 4 - 2 8 of 8 www.diodes.com February 2014 © Diodes Incorporated AP1603 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. Diodes Incorporated does not assume any liability ari sing out of the application or use of this document or an y product described herein; neither does Di odes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Inco rporated products for any unintended or una uthorized application, Customers shall i ndemnify and hold Diodes Incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. This document is written in English but may be translated into multiple languages for reference. Only the English version of t his document is the final and determinative format released by Diodes Incorporated. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical component s in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporate d and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2014, Diodes Incorporated www.diodes.com