R5541K Series Low ON Resistance Nch Load Switch IC NO.EA-319-140526 OUTLINE The R5541K is a CMOS-based dual supply voltage load switch IC. The R5541K is an ideal switch for supplying the power from the secondary power source such as the output of a step-down DC/DC converter to the load circuit. A built-in Nch. transistor with typically 18 mΩ ON resistance allows the R5541K to provide a low dropout voltage and prevents the reverse current during shutdown mode. Internally, a single IC consists of an internal voltage step-up circuit, a soft-start circuit, a thermal shutdown circuit, a chip enable circuit and a UVLO circuit. The gate voltage of Nch. driver transistor is supplied by a soft-start circuit. The soft-start circuit is supplied by the external power source (VBIAS). Soft-start time is adjustable by connecting an external capacitor. The R5541K is offered in an ultra-small 6-pin DFN(PLP)1216-6G package which achieve the smallest possible footprint solution on boards where area is limited. FEATURES z Supply Current ·········································· Typ. 25 µA (IOUT = 0 mA) z Standby Current ········································· Typ. 0.01 µA z VIN Input Voltage Range······························· 0.6 V to 4.8 V z VBIAS Input Voltage Range ···························· 2.5 V to 5.5 V z Switch ON Resistance ································· Typ. 18 mΩ (VIN = 1.0 V, VBIAS = 5.0 V) z Output Current ··········································· Max. 3 A z A single Nch MOSFET Circuit z Soft-start Function z Thermal Shutdown Circuit z Auto-discharge Function (R5541K001D) z Package ··················································· DFN(PLP)1216-6G APPLICATIONS z Secondary Power Source for hand-held communication equipments and laptop PCs 1 R5541K NO.EA-319-140526 BLOCK DIAGRAMS R5541K001B Block Diagram R5541K001D Block Diagram SELECTION GUIDE The auto-discharge function*1 is a user-selectable option. Selection Guide Product Name Package Quantity per Reel Pb Free Halogen Free R5541K001∗-E2 DFN(PLP)1216-6G 5,000 pcs Yes Yes ∗: Specify the CE Pin Polarity and auto-discharge option. B: Active-High, no auto-discharge function D: Active-High, auto-discharge function *1 Auto-discharge function quickly lowers the output voltage to 0 V, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor. 2 R5541K NO.EA-319-140526 PIN DESCRIPTION 6 Top View 5 4 4 Bottom View 5 6 1 2 3 3 2 1 DFN(PLP)1216-6G Pin Configurations DFN(PLP)1216-6G Pin Description *1 Pin No. Symbol Description 1 CE Chip Enable Pin (Active-High) 2 VIN Input Pin 2*1 3 VBIAS Input Pin 1*1 4 GND Ground Pin 5 VOUT Output Pin 6 DELAY DELAY Pin for Soft-start Setting VIN should be used as VIN ≤ VBIAS. 3 R5541K NO.EA-319-140526 ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings Symbol Rating Unit VBIAS Pin Input Voltage −0.3 to 6.0 V VIN VIN Pin Input Voltage −0.3 to 5.5 V VCE CE Pin Input Voltage −0.3 to 6.0 V VOUT VOUT Pin Voltage −0.3 to VIN V IOUT Output Current 3.0 A PD Power Dissipation (JEDEC STD.51-7 Test Land Pattern)*1 714 mW Tj Junction Temperature −40 to 125 °C Storage Temperature Range −55 to 125 °C VBIAS Tstg *1 Item Refer to PACKAGE INFORMATION for detailed information. ABSOLUTE MAXIMUM RATINGS Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. The functional operation at or over these absolute maximum ratings is not assured. RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS) All of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions. 4 R5541K NO.EA-319-140526 ELECTRICAL CHARACTERISTICS VBIAS = 5.0 V, VIN = 1.0 V, CBIAS = 1 µF, CIN = none, COUT = 0.1 µF, unless otherwise noted. The specifications surrounded by are guaranteed by Design Engineering at −40°C ≤ Ta ≤ 85°C. R5541K Electrical Characteristics Symbol VBIAS (Ta = 25°C) Item Conditions Min. Typ. Max. Unit VBIAS Pin Input Voltage 2.5 5.5 V VIN VIN Pin Input Voltage 0.6 4.8 V RON Switch ON Resistance IOUT = 500 mA 18 28 mΩ ISS Supply Current IOUT = 0 mA, VBIAS Pin 25 47 µA Standby Current VCE = 0 V, VIN = 4.8 V, VBIAS = 5.5 V VBIAS Pin 0.01 0.15 µA VIN Pin 0.01 1 µA 2.0 2.49 V 0.3 0.59 V Istandby UVLO TTSD TTSR Undervoltage Lockout Voltage Thermal Shutdown Temperature Thermal Shutdown Release Temperature VBIAS Pin *1 VIN Pin*2 Junction Temperature 145 °C Junction Temperature 125 °C ICEPD CE Pull-down Current 0.4 VCEH CE Input Voltage “H” VCEL CE Input Voltage “L” IDELAY DELAY Pin Current *3 RLOW Low Output Nch Tr. ON Resistance (R5541K001D) VCE = 0 V 0.8 1.0 1.25 µA V 1.5 80 0.4 V 1.8 µA Ω All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C). *1 The UVLO detector threshold and the UVLO release voltage are between the min and the max of UVLO with Typ. 90 mV hysteresis. *2 The UVLO detector threshold and the UVLO release voltage are between the min and the max of UVLO with Typ. 70 mV hysteresis. *3 Soft-start time can be adjusted by using IDELAY and a capacitor (CD). Refer to Soft-start Function in TECHNICAL NOTES for detailed Information. 5 R5541K NO.EA-319-140526 TYPICAL APPLICATION R5541K Enable Signal CE DELAY VIN VIN VOUT VBIAS VBIAS GND (CIN) ( Load Device CD ) ( COUT RL ) (CBIAS) R5541K Typical Application TECHNICAL NOTES The performance of a power source circuit using this device is highly dependent on a peripheral circuit. A peripheral component or the device mounted on PCB should not exceed a rated voltage, a rated current or a rated power. When designing a peripheral circuit, please be fully aware of the following points. z An input capacitor (CIN) and a bypass capacitor (CBIAS) are NOT necessarily required between the VIN pin and GND. If there is a possibility that the parasitic element (inductance) of VIN may generate spike noise, connect an appropriate capacitor (about 0.1 µF) between the VIN pin and GND. z VIN and VBIAS should always be used as VIN ≤ VBIAS. z Connect the DELAY pin to a capacitor (CD) or leave the DELAY pin floating. 6 R5541K NO.EA-319-140526 SOFT-START FUNCTION Soft-start function maintains the smooth control of the output voltage to prevent an inrush current during startup by adjusting the soft-start time (tstart) (VOUT = 10% to 90%). tstart can be adjusted by connecting a capacitor (CD) between the DELAY pin and GND. The calculation of CD is as follows. CD [nF] = 7.5 x tstart [ms] x IDELAY [µA] / VIN [V] If CD is not connected to the DELAY pin, leave the DELAY pin floating. If the DELAY pin is left floating, the calculation of the start-up time (tr) (VOUT = 10% to 90%) is as follows. tr [ms] = 0.04 x VIN [V] (Typ.) VBIAS, VIN and CE can be sequenced in any order; the device can start up with soft-start function. 7 R5541K NO.EA-319-140526 PACKAGE INFORMATION POWER DISSIPATION (DFN(PLP)1216-6G) Power Dissipation (PD) of the package is dependent on PCB material, layout, and environmental conditions. The following conditions are used in this measurement. Measurement Conditions JEDEC STD.51-7 Test Land Pattern Environment Mounting on Board (Wind Velocity = 0m/s) Board Material Glass Cloth Epoxy Plastic (4 Layer) Board Dimensions 76.2 mm × 114.3 mm × 1.6 mm Copper Ratio Top side, Back side: 60 mm x 60mm, Approx.10% 2nd, 3rd layers: 74.2 mm x 74.2 mm, Approx. 100% Through-holes φ 0.85 mm x 44 pcs Measurement Result (Ta = 25°C, Tjmax = 125°C) JEDEC STD.51-7 Test Land Pattern Power Dissipation 714 mW Thermal Resistance θja = (125 − 25°C) / 0.714 W = 140°C/W θjc = 21°C/W 76.2 60 750 714 40 900 JEDEC STD.51-7 Test Land Pattern 60 600 450 114.3 Power Dissipation PD (mW) 1050 300 150 0 85 0 25 50 75 100 125 Ambient Temperature (°C) IC Mount基板レイアウト Area (Unit: mm) IC 実装位置(単位: mm) Ambient Temperature vs. Power Dissipation Measurement Board Pattern 8 R5541K NO.EA-319-140526 0.60 B 1.20 0.05 5 C0.10 INDEX 2 1 0.18±0.05 0.58±0.05 0.4MAX 0.07MIN 3 S 6 0.35±0.05 ×4 4 0.60 0.18±0.05 0.05 Bottom View 0.05 0.45±0.05 1.60 A 0.08 PACKAGE DIMENSIONS (DFN(PLP)1216-6G) M AB (Unit: mm) S DFN(PLP)1216-6G Package Dimensions MARK SPECIFICATION (DFN(PLP)1216-6G) cdef: Product Code …Refer to MARK SPECIFICATION TABLE DFN(PLP)1216-6G. gh: Lot Number …Alphanumeric Serial Number cde fgh DFN(PLP)1216-6G Mark Specification MARK SPECIFICATION TABLE (DFN(PLP)1216-6G) Mark Specification Table Product Name cdef R5541K001B DZ01 R5541K001D DZ03 9 R5541K NO.EA-319-140526 TYPICAL CHARACTERISTICS Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed. R5541K001x VIN = 1.0 V, IOUT = 500 mA R5541K001x IOUT = 500 mA, Ta = 25°C Switch On Resistance vs. VBIAS Input Voltage Switch On Resistance vs. VBIAS Input Voltage R5541K001x VBIAS = 5.0 V, IOUT = 500 mA, Ta = 25°C R5541K001x VIN = 1.0 V, VBIAS = 5.0 V, IOUT = 500 mA 30 Switch On Resistance [mΩ] 28 26 24 22 20 18 16 14 12 10 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VIN Input Voltage [V] Switch On Resistance vs. VIN Input Voltage Switch On Resistance vs. Temperature 10 R5541K NO.EA-319-140526 R5541K001x VIN = 4.8 V, VBIAS = 5.5 V R5541K001x VIN = 1.0 V VIN Supply Current vs. VIN Input Voltage VBIAS Supply Current vs. VBIAS Input Voltage R5541K001x VBIAS = 5.5 V R5541K001x VIN = 0.6 V VIN Supply Current vs. Temperature VBIAS Supply Current vs. Temperature 11 R5541K NO.EA-319-140526 R5541K001x VBIAS = 5.5 V R5541K001x VIN = 0.6 V VIN Standby Current vs. VIN Input Voltage VIN Standby Current vs. VBIAS Input Voltage R5541K001x VBIAS = 5.5 V R5541K001x VIN = 0.6 V VIN Standby Current vs. Temperature VBIAS Standby Current vs. Temperature 12 R5541K NO.EA-319-140526 R5541K001x VIN = 3.6 V, VBIAS = 5.5 V, RLOAD = 10 Ω, COUT = 0.1 µF R5541K001x VIN = 3.6 V, VBIAS = 5.5 V, RLOAD = 10 Ω, COUT = 0.1µF VOUT Output Voltage On Time vs. DELAY Capacitance tr vs. DELAY Capacitance R5541K001x VBIAS = 5.0 V, CD = 10 nF, RLOAD = 10 Ω, COUT = 0.1 µF R5541K001D VBIAS = 5.0 V, CD = 10 nF, COUT = 0.1 µF VOUT Output Voltage On Time vs. VIN Input Voltage VOUT Output Voltage Off Time vs. VIN Input Voltage R5541K001x VIN = 4.8 V, VBIAS = 5.0 V, CD = 10 nF, COUT = 0.1 µF R5541K001D VIN = 4.8 V, VBIAS = 5.0 V, CD = 10 nF, COUT = 0.1 µF VOUT Output Voltage On Time vs. Load Resistance VOUT Output Voltage Off Time vs. Load Resistance 13 R5541K NO.EA-319-140526 R5541K001D VIN = 1.0 V, VBIAS = 5.5 V, CD = 10 nF, COUT = 0.1 µF VOUT Output Voltage On Time vs. Load Resistance VOUT Output Voltage Off Time vs. Load Resistance R5541K001x VIN = 1.0 V, CD = 10 nF, RLOAD = 10 Ω, COUT = 0.1 µF R5541K001x VIN = 1.0 V, CD = 10 nF, RLOAD = 10 Ω, COUT = 0.1 µF tr [ms] R5541K001x VIN = 1.0 V, VBIAS = 5.5 V, CD = 10 nF, COUT = 0.1 µF tr vs. VBIAS Input Voltage ton Turn-on Time vs. VBIAS Input Voltage R5541K001x VIN = 1.0 V, RLOAD = 10 Ω, COUT = 0.1 µF VOUT Output Voltage On Time vs. VBIAS Input Voltage 14 1. 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