LSP5526 DIODES | Alldatasheet
Document overview
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Technical content
Features
2A Output Current Wide 4.5V to 23V Operating Input Range Integrated Power MOSFET Switches Output Adjustable from 0.925V to 18V Up to 96% Efficiency Programmable Soft-Start Stable with Low ESR Ceramic Output Capacitors Fixed 340KHZ Frequency Cycle by Cycle Over Current Protection Input Under Voltage Lockout Package: SOP-8L Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Distributed power systems Networking systems FPGA, DSP, ASIC power supplies Green electronics / appliances Notebook computers Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information 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.
Document number: DS44109 Rev. 9 - 2 2 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Block Diagram INTERNAL REGULATORS FB SS COMP EN 1.1V 0.3V 0.925V 2.5V 1.5V OVP SHUTDOWN COMPARATOR ERROR AMPLIFIER LOCKOUT COMPARATOR EN OK 6uA OSCILLATOR 340/120KHz RAMP CLK 1.2V OVP IN<4.10V IN CURRENT COMPARATOR CURRENT SENSE AMPLIFIER VIN BS SW GND S Q R Q
Ordering Information
Part Number Package Package Code Packing Qty. Carrier LSP5526-S8A SOP-8L S8 2,500pcs Tape & Reel
Document number: DS44109 Rev. 9 - 2 3 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Pin Assignment 1 8 SS EN COMP FB BS SW GND (TOP View) SOP-8L VIN Pin Descriptions Pin Name Name Pin Description 1 BS Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Connect a 0.01uF capacitor between BS and SW. 2 VIN Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Capacitor in the Application Information section. 3 SW Switch Output. Connect this pin to the switching end of the inductor. 4 GND Ground. 5 FB Feedback Input. The voltage at this pin is regulated to 0.925V. Connect to the resistor divider between output and ground to set output voltage. 6 COMP Compensation Pin. See Stability Compensation in the Application Information section. 7 EN Enable Input. When higher than 2.7V, this pin turns the IC on. When lower than 1.1V, this pin turns the IC off. Output voltage is discharged when the IC is off. This pin should not be left open. Recommend to put a 200KΩ pull-up resistor to Vin for startup. 8 SS Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1uF capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS unconnected.
Document number: DS44109 Rev. 9 - 2 4 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Absolute Maximum Ratings(at TA=25°C) (Note 4) Note: Operate over the “Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to such conditions for extended time may still affect the reliability of the device. Characteristics Value Unit Input Supply Voltage -0.3 to 25 V SW Voltage -0.3 to VIN + 0.3 V BS Voltage VSW – 0.3 to VSW + 6 V EN -0.3 to 8 V FB, COMP Voltage -0.3 to 5 V Continuous SW Current Internally limited A Maximum Junction Temperature 150 °C Storage Temperature Range -65 to 150 °C SOP-8L Thermal Resistance (Junction to Case) 60 °C/W SOP-8L Thermal Resistance (Junction to Ambient) 150 °C/W SOP-8L Power dissipation 810 mW Moisture Sensitivity (MSL) Please refer the MSL label on the IC package bag/carton for detail Note 4: Ratings apply to ambient temperature at 25°C. Recommended Operating Conditions Characteristics Min Max Unit Input Supply Voltage 4.5 23 V Operating Junction Temperature -20 +125 °C
Document number: DS44109 Rev. 9 - 2 5 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526
Electrical Characteristics
(TA=25° C, unless otherwise specified) Characteristics Symbol Conditions Min Typ Max Unit Feedback Voltage VFB 4.5V ≤ VIN ≤ 23V 0.900 0.925 0.950 V Feedback Overvoltage Threshold — — — 1.1 — V High-Side Switch-On Resistance* — — — 95 — mΩ Low-Side Switch-On Resistance* — — — 95 — mΩ High-Side Switch Leakage — VEN = 0V, VSW = 0V — — 10 uA Upper Switch Current Limit — Minimum Duty Cycle 2.7 3.5 — A COMP to Current Limit Transconductance GCOMP — — 3.3 — A/V Error Amplifier Transconductance GEA ΔICOMP = ± 10uA — 920 — uA/V Error Amplifier DC Gain* AVEA — — 480 — V/V Switching Frequency fSW — — 340 — KHz Short Circuit Switching Frequency — VFB = 0 — 120 — KHz Maximum Duty Cycle DMAX VFB = 0.8V — 92 — % Minimum On Time* — — — 220 — nS EN Shutdown Threshold Voltage — VEN Rising 1.1 1.4 2 V EN Shutdown Threshold Voltage Hysteresis — — — 180 — mV EN Lockout Threshold Voltage — — 2.2 2.5 2.7 V EN Lockout Hysteresis — — — 130 — mV Supply Current in Shutdown — VEN = 0 — 0.3 3.0 uA IC Supply Current in Operation — VEN = 3V, VFB = 1.0V — 1.3 1.5 mA Input UVLO Threshold Rising UVLO VEN Rising 3.80 4.05 4.40 V Input UVLO Threshold Hysteresis — — — 100 — mV Soft-start Current — VSS = 0V — 6 — uA Soft-start Period — CSS = 0.1uF — 15 — mS Thermal Shutdown Temperature* — Hysteresis = 25° C — 160 — °C Note : * Guaranteed by design.
Document number: DS44109 Rev. 9 - 2 6 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Application Circuit LSP5526 Circuit, 5V/2A output LSP5526 Circuit, 3.3V/2A output Note: C2 is required for separate EN signal.
© 2022 Copyright Diodes Incorporated. All Rights Reserved. to the peak-to-peak ripple current being 30% of the maximum output current. not saturate at the current limit. Typical inductor values for various output voltages are shown in Table 2. Table 2. Typical Inductor Values
Document number: DS44109 Rev. 9 - 2 8 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Input Capacitor The input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the converter. A low ESR capacitor is highly recommended. Since large current flows in and out of this capacitor during switching, its ESR also affects efficiency. The input capacitance needs to be higher than 10uF. The best choice is the ceramic type; however, low ESR tantalum or electrolytic types may also be used provided that the RMS ripple current rating is higher than 50% of the output current. The input capacitor should be placed close to the VIN and GND pins of the IC, with the shortest traces possible. In the case of tantalum or electrolytic types, they can be further away if a small parallel 0.1uF ceramic capacitor is placed right next to the IC. Output Capacitor The output capacitor also needs to have low ESR to keep low output voltage ripple. In the case of ceramic output capacitors, RESR is very small and does not contribute to the ripple. Therefore, a lower capacitance value can be used for ceramic capacitors. In the case of tantalum or electrolytic capacitors, the ripple is dominated by RESR multiplied by the ripple current. In that case, the output capacitor is chosen to have sufficiently low ESR. For ceramic output capacitors, typically choose a capacitance of about 22uF. For tantalum or electrolytic capacitors, choose a capacitor with less than 50mΩ ESR. Optional Schottky Diode During the transition between high -side switch and low -side switch, the body diode of the low side power MOSFET conducts the inductor current. The forward voltage of this body diode is high. An optional Schottky diode may be paralleled between the SW pin and GND pin to improve overall efficiency. Table 3 lists example Schottky diodes and their Manufacturers. Table 3－Diode Selection Guide Part Number Voltage/Current Rating Vendor B130 30V, 1A Diodes Incorporated SK13 30V, 1A Diodes Incorporated
© 2022 Copyright Diodes Incorporated. All Rights Reserved. Figure 2. Stability Compensation
2 COMPVEA
But limit RCOMP to 10KΩ maximum.
Document number: DS44109 Rev. 9 - 2 10 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Stability Compensation (Continued) STEP2. Set the zero fZ1 at 1/4 of the crossover frequency. If RCOMP is less than 10KΩ, the equation for CCOMP is: )(637.0
1 FfcRC
STEP3. If the output capacitor’s ESR is high enough to cause a zero at lower than 4 times the crossover frequency, an additional compensation capacitor CCOMP2 is required. The condition for using CCOMP2 is: ESRCOUTR And the proper value for CCOMP2 is: COMP ESRCOUTOUT 2COMP R RCC A reference table as follows: Table 4 Component Selection Guide for Stability Compensation Vin Range (V) Vout (V) Cout Rcomp (R3) (kΩ) Ccomp (C4) (nF) Ccomp2 (C5) (pF) Inductor (uH) 5 – 12 1.0 22uF x2 Ceramic 3.3 5.6 none 4.7 5 - 15 1.2 3.9 4.7 none 4.7 5 - 23 1.8 5.6 3.3 none 10 5 - 23 2.5 8.2 2.2 none 10 5 - 23 3.3 10 2 none 10 5 - 23 5 10 3.3 none 10 5 - 12 1.0 470uF/ 6.3V/ 120mΩ 10 6.8 680 4.7 5 - 15 1.2 5 - 23 1.8 10 5 - 23 2.5 5 - 23 3.3 5 - 23 5 (10) (11) (12)
© 2022 Copyright Diodes Incorporated. All Rights Reserved. Figure 3. Load Transient Testing VS Compensation Value
Document number: DS44109 Rev. 9 - 2 12 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Typical Characteristics Light Load Operation (No load) Heavy Load Operation (2A Load) Vin=12V, Iin=8.2 mA, Vout=3,3V Vin=12V, Vout=3,3V Startup Vin=12V, Vout=3.3V, Iout=1A through Vin. through Enable. Short Circuit Protection Vin=12V
Document number: DS44109 Rev. 9 - 2 13 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Typical Characteristics (Continued) SWITCHES RdsON vs JUNCTION TEMPERATURE (Vin=12V) 0.08 0.09 0.1 0.11 0.12 0.13 0.14 0.15 0.16 10 30 50 70 90 110 130 150 170 JUNCTION TEMPERATURE (C) SWITCHES RdsON
Document number: DS44109 Rev. 9 - 2 14 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Marking Information LSC LSP5526 VYYWWUZ Part ID LOGO V YYWW UZ Internal Code Date code WW：Week(01~53) Output Voltage Blank：ADJ SOP-8L
Document number: DS44109 Rev. 9 - 2 15 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 Mechanical Information (1) Package type: SOP-8L Unit : mm Symbol Min Max A - 1.75 A1 0.10 0.25 A2 1.25 1.65 b 0.33 0.51 c 0.10 0.26 D 4.70 5.10 E 5.80 6.20 E1 3.70 4.10 e 1.27 REF L 0.40 1.27 L1 1.04 REF Gauge Plane 0.25 BSC θ 0o 8o
Document number: DS44109 Rev. 9 - 2 16 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 MSL (Moisture Sensitive Level) Information IPC/JEDEC J-STD-020D.1 Moisture Sensitivity Levels Table LEVEL FLOOR LIFE SOAK REQUIREMENTS Standard Accelerated Equivalent5 eV 0.40-0.48 eV 0.30-0.39 CONDITION TIME CONDITION TIME (hours) CONDITION TIME (hours) TIME (hours)
1 Unlimited ≤30 °C /85%
+5/-0 85 °C /85% RH NA NA NA 2 1 year ≤30 °C /60% RH 168 +5/-0 85 °C /60% RH NA NA NA 2a 4 weeks ≤30 °C /60% RH 6966 +5/-0 30 °C /60% RH 120 -1/+0 168 3 168 hours ≤30 °C /60% RH 1926 +5/-0 30 °C /60% RH -1/+0 4 72 hours ≤30 °C /60% RH 966 +2/-0 30 °C /60% RH +0.5/-0 5 48 hours ≤30 °C /60% RH 726 +2/-0 30 °C /60% RH +0.5/-0 a 24 hours ≤30 °C /60% RH 486 +2/-0 30 °C /60% RH +0.5/-0
6 Time on Label
(TOL) ≤30 °C /60% RH TOL 30 °C /60% RH NA NA NA Note 5: CAUTION - To use the ‘‘accelerated equivalent’’ soak conditions, correlation of damage response (including electrical, after soak and reflow), should be established with the ‘‘standard’’ soak conditions. Alternatively, if the known activation energy for moisture diffusion of the package materials is in the range of 0.40 - 0.48 eV or 0.30 - 0.39 eV, the ‘‘accelerated equivalent’’ document JESD22-A120 provides a method for determining the diffusion coefficient. Note 6: The standard soak time includes a default value of 24 hours for semiconductor manufacturer’s exposure time (MET) between bake and bag and includes the maximum time allowed out of the bag at the distributor’s facility. If the actual MET is less than 24 hours the soak time may be reduced. For soak conditions of 30 ° C/60% RH, the soak time is reduced by 1 hour for each hour the MET is less than 24 hours. For soak conditions of 60 ° C/60% RH, the soak time is reduced by 1 hour for each 5 hours the MET is less than 24 hours. If the actual MET is greater than 24 hours the soak time must be increased. If soak conditions are 30 ° C/60% RH, the soak time is increased 1 hour for each hour that the actual MET exceeds 24 hours. If soak conditions are 60 ° C/60% RH, the soak time is increased 1 hour for each 5 hours that the actual MET exceeds 24 hours. Mechanical Data Moisture Sensitivity: Level 3 per J-STD-020 Terminals: Finish – Matte Tin Plated Leads, Solderable per MIL-STD-202, Method 208 Weight: 0.076 grams (Approximate)
Document number: DS44109 Rev. 9 - 2 17 of 17 www.diodes.com July 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. LSP5526 IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICUL AR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes’ products described herein and application examples. Diodes does not assume any liability arising out of the application or us e of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes’ products. 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