AP5724

AP5724

Document overview

• Manufacturer or author: Diodes Inc
• PDF pages: 15

Technical content

Features

• High Efficiency: 84% Typical
• Fast 1.2MHz Switching Frequency
• Current Limit and UVLO Protections
• Internal Thermal Shutdown
• Internal Over Voltage Protection
• Integrated Soft-Start Function
• SOT26, TSOT26 and U-DFN2020-6: Available in “Green” Molding Compound (No Br, Sb)
• Lead-Free Finish; RoHS Compliant (Notes 1 & 2) Pin Assignments 3 74 OVP FB EN SW (Top View) VIN GND SOT26 / TSOT23-6 SW VIN OVP GND FB EN (Top View) U-DFN2020-6

Applications

• Cellular Phones
• PDAs, Hand held Computers
• Digital Cameras
• MP3 Players
• GPS Receivers Notes: 1. EU Directive 2002/95/EC (R oHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied. 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. Typical Applications Circuit VIN SW EN GND FB AP5724 COUT 1uF RSET 22uH D1 VIN CIN 1uF OVP 2~6 LEDs PWM Dimming OFFON Figure 1 Typical Application Circuit Pb

Document number: DS31843 Rev. 4 - 2 2 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Pin Descriptions Pin Name Functions SW Switch Pin. Connect inductor/diode here. Mi nimize trace area at this pin to reduce EMI. GND GND pin. FB Feedback Pin. Reference voltage is 0.1V. Connect cathode of lowest LED and a sense resister here. Calculate resistor value according to the formula: RSET = 0.1V / ILED EN Converter On/Off Control Input. A high input at EN turns the converter On, and a low input turns it off. If On/Off control is not needed, connect EN to the input source for automatic startup. The EN pin cannot be left floating. OVP Output Voltage detect pin for over voltage protection. VIN Input Supply Pin. Must be locally bypassed with 1μF or 2.2μF to reduce input noise. Functional Block Diagram 1.2MHz Oscillator RAMP Generator Σ - + - + VREF 0.1VVIN 3FB Rc Cc Comparator CONTROL LOGIC Driver SW

2 GND

Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) Symbol Parameter Rating Unit VIN VIN Pin Voltage -0.3 to +7 V VSW SW Voltage -0.3 to +34 V VOVP OVP Pin Voltage -0.3 to +35 V VFB Feedback Pin Voltage -0.3 to +7 V EN EN -0.3 to +7 V TJ(MAX) Maximum Junction Temperature 150 °C TLEAD Lead Temperature 300 °C TST Storage Temperature Range -65 to +150 °C Caution: Operation above the absolute maximum ratings can caus e device failure. These values, therefore, must not be exceeded under any condition. Operation at the absolute maximum rating for extended periods, may reduce device reliability.

Document number: DS31843 Rev. 4 - 2 3 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol Parameter Min Max Unit VIN Input Voltage 2.7 5.5 V TJ Operating Junction Temperature -40 125 °C TA Operating Ambient Temperature -40 85 °C Electrical Characteristics (@ VIN = 3.6V, TA = +25°C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit System Supply Input VIN Operating Input Voltage 2.7 — 5.5 V UVLO Under Voltage Lockout — 2.2 2.4 V Under Voltage Lockout Hysteretic — 85 — mV IQ Quiescent Current FB = 0.2V, No Switching — 500 — μA ISD Shutdown Current VEN < 0.4V — 0.1 1 μA Oscillator FOSC Operation Frequency 1 1.2 1.4 MHz Dmax Maximum Duty Cycle 86 90 — % Reference Voltage VFB Feedback Voltage 0.09 0.1 0.11 V IFB FB Pin Bias Current 10 45 100 nA MOSFET Rds(on) On Resistance of MOSFET — 0.95 1.2 Ω IOCP Switching Current Limit Normal Operation — 750 — mA Control and Protection EN Voltage High ON 1.5 — — V EN Voltage Low OFF — — 0.4 V IEN EN Pin Pull Low Current — 4 6 μA OVP OVP Threshold 26 30 34 V θJA Thermal Resistance Junction-to-Ambient SOT26 (Note 3) — 162 — °C/W TSOT26 (Note 3) — 152 — U-DFN2020-6 (Note 3) — 200 — θJC Thermal Resistance Junction-to-Case SOT26 (Note 3) — 36 — °C/W TSOT26 (Note 3) — 32 — U-DFN2020-6 (Note 3) — 30 — Note: 3. Test condition for SOT26, TSOT26 and U-DFN2020-6: Device mounted on FR-4 substrate, single-layer PC board, 2oz copper, with minimum recommended pad layout

Document number: DS31843 Rev. 4 - 2 4 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Typical Performance Characteristics (6 LEDS, VIN = 3.6V, IOUT = 25mA) VIN vs. Shutdown Current 0.2 0.4 0.6 0.8 2.5 3 3.5 4 4.5 5 5.5 VIN (V) Shutdown Current(uA) VIN vs. Quiescent Current 100 200 300 400 500 600 700 2.5 3 3.5 4 4.5 5 5.5VIN (V) Quiescent Current(uA) VIN vs. Frequency 1.05 1.1 1.15 1.2 1.25 2.5 3 3.5 4 4.5 5 5.5 VIN (V) Frequency(MHz) VIN vs. Max Duty 100 2 . 533 . 544 . 555 . 5 V IN(V) Max Duty(%) VIN vs. Feedback Voltage 0.06 0.07 0.08 0.09 0.1 0.11 0.12 2.5 3 3.5 4 4.5 5 5.5 VIN (V) Feedback Voltage(V) IOUT vs. Feedback Voltage 0.06 0.07 0.08 0.09 0.1 0.11 0.12 01 02 03 04 05 0 IOUT (mA) Feedback Voltage(V)

Document number: DS31843 Rev. 4 - 2 5 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Typical Performance Characteristics (cont.) (6 LEDS, VIN = 3.6V, IOUT = 25mA) VIN vs. OVP Threshold 2.5 3 3.5 4 4.5 5 5.5 VIN (V) OVP Threshold(V) Temperature vs. Shutdown Current 0.2 0.4 0.6 0.8 -50 -25 0 25 50 75 100 125 Shutdown Current(uA) Temperature (℃) Temperature vs. OVP Threshold -50 -25 0 25 50 75 100 125 Temperature (℃) OVP Threshold(V) Temperature vs. Frequency 0.2 0.5 0.8 1.1 1.4 1.7 -50 -25 0 25 50 75 100 125 Temperature ( ℃) Frequency (MHZ) VIN = 3.6V VIN = 4.2V Temperature vs. Feedback Voltage 100 110 120 -50 -25 0 25 50 75 100 125 Temperature (℃) Feedback Voltage(mV) VIN = 4.2V VIN = 3.6V

Document number: DS31843 Rev. 4 - 2 6 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Typical Performance Characteristics (cont.) (6 LEDS, VIN = 3.6V, IOUT = 25mA) IOUT vs. Efficiency 0 5 10 15 20 25 30 IOUT (mA) Efficiency(%)

4 LEDs ; L = 22uH

VIN = 4.2V VIN = 3.6V IOUT vs. Efficiency 0 5 10 15 20 25 30 I OUT (mA) Efficiency(%)

6 LEDs ; L = 22uH

VIN = 3.6V VIN = 4.2V VIN vs. Efficiency 100 2.5 3 3.5 4 4.5 5 VIN (V) Efficiency(%)

3 LEDs

6 LEDs

4 LEDs

Document number: DS31843 Rev. 4 - 2 7 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Typical Performance Characteristics (cont.) (6 LEDS, VIN = 3.6V, IOUT = 25mA) VOUT Ripple VIN = 3.6V; 4 LEDs ; IOUT = 30mA VOUT Ripple VIN = 3.6V; 6 LEDs ; IOUT = 30mA POWER ON VIN = 3.6V; 6 LEDs ; IOUT = 30mA POWER OFF VIN = 3.6V; 6 LEDs ; IOUT = 30mA VEN VEN VOUT VOUT VOUT Irushi Irushin g SW SW VOUT

current applications (like 3S8P). recommended to minimize output ripple. drop of a Schottky diode represents the conduction losses in the diode, while the diode capacitance (C T or C D) represents the switching losses. 200mA is sufficient for most AP5724 applications. to have accurate LED current, precision resistors are preferred (1% is recommended). The formula and table for RSET selection are shown below. Table 1. RSET Resistor Value Selection the over voltage protection is activated and SW pin stops switching.

Table 2. Suggested Inductors Table 3. Suggested Capacitors for CIN and COUT Table 4. Suggested Diodes Table 5. Suggested Resistor Table 6. Suggested W-LED

Document number: DS31843 Rev. 4 - 2 11 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724

Ordering Information

7 : Tape & Reel Green G : Green FDC : U-DFN2020-6 W : SOT26 WU : TSOT26 Part Number Package Code Packaging 7” Tape and Reel Quantity Part Number Suffix AP5724WG-7 W SOT26 3000/Tape & Reel -7 AP5724WUG-7 WU TSOT26 3000/Tape & Reel -7 AP5724FDCG-7 FDC U-DFN2020-6 3000/Tape & Reel -7 Marking Information (1) SOT26 and TSOT26 1 2 3 XX Y WX XX : Identification Code Y : Year 0~9 X : A~Z : Green ( Top View ) W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week Part Number Package Identification Code AP5724WG-7 SOT26 FB AP5724WUG-7 TSOT26 GB (2) U-DFN2020-6 ( Top View ) XX Y : Year : 0~9 X : A~Z : Green XX : Identification Code W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week Y W X Part Number Package Identification Code AP5724FDCG-7 U-DFN2020-6 GB

Document number: DS31843 Rev. 4 - 2 12 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. (1) SOT26 (2) TSOT26 (3) U-DFN2020-6 Type C 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 TSOT26 Dim Min Max Typ A − 1.00 − A1 0.01 0.10 − A2 0.84 0.90 − D − − 2.90 E − − 2.80 E1 − − 1.60 b 0.30 0.45 − c 0.12 0.20 − e − − 0.95 e1 − − 1.90 L 0.30 0.50 L2 − − 0.25 θ 0° 8° 4° θ1 4° 12° − All Dimensions in mm U-DFN2020-6 Type C Dim Min Max Typ A 0.57 0.63 0.60 A1 0.00 0.05 0.02 A3 –– –– 0.15 b 0.25 0.35 0.30 D 1.95 2.075 2.00 D2 1.55 1.75 1.65 E 1.95 2.075 2.00 E2 0.86 1.06 0.96 e –– –– 0.65 L 0.25 0.35 0.30 Z –– –– 0.20 All Dimensions in mm A M J LD B C H K c L E1 E D e 6x b θ 4x 1 θ A D E e b L A A1 A3 Seating Plane Pin #1 ID Z (4x)

Document number: DS31843 Rev. 4 - 2 13 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) SOT26 (2) TSOT26 (3) U-DFN2020-6 Type C Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y 0.80 C1 2.40 C2 0.95 Dimensions Value (in mm) C 0.950 X 0.700 Y 1.000 Y1 3.199 Dimensions Value (in mm) C 0.650 X 0.350 X1 1.650 X2 1.700 Y 0.525 Y1 1.010 Y2 2.400 X Z Y C2C2 G C C X (6x) Y (6x) Y( 6 x ) X (6x) C

Document number: DS31843 Rev. 4 - 2 14 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 Tape Orientation For U-DFN2020-6

Document number: DS31843 Rev. 4 - 2 15 of 15 www.diodes.com December 2013 © Diodes Incorporated AP5724 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 reserve the right to ma ke modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability ari sing out of the application or use of this document or any product described her ein; neither does Diodes Incor porated 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 pr oducts 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 Incorporated products for any unintended or unauthorized application, Customers shall i ndemnify and hold Diodes Incorporated and its representatives 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 us e as critical components 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 ramifications 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 © 2013, Diodes Incorporated www.diodes.com