A4480 ALLEGRO
Document overview
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Technical content
A4480-DS, Rev. 2 MCO-000191 FEATURES AND BENEFITS
- Automotive AEC-Q100 qualified
- Wide operating range of 3.5 to 28 V , with 40 V load dump rating
- Linear regulator output with foldback short-circuit and short-to-battery protection
- Boost function to maintain output when input is low
- Power OK (POK) flag
- High-voltage logic-level enable input (ENB) for microprocessor or ignition control
- Pin-to-pin and pin-to-ground tolerant at every pin Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OK Figure 1: Typical Application Circuit PACKAGE 8-pin SOIC with exposed thermal pad (suffix LJ)
DESCRIPTION
The A4480 is a wide input regulator with complete control, diagnostics, and protection features that address many requirements of automotive applications. It includes a boost function to allow operation with input voltages from 3.5 to 28 V , while maintaining a 5 V output voltage. The A4480 is able to supply up to 50 mA of load current. An enable pin (ENB) allows control of the regulator output. This pin is rated to operate at up to 40 V , so it can be connected directly to a car battery. Diagnostic output from the A4480 includes an open-drain Power OK (POK) output to alert the microprocessor that a fault has occurred. Protection features include input undervoltage lockout (UVLO), foldback overcurrent protection, output under/overvoltage protections (UV/OVP), and thermal shutdown (TSD). In addition, the output is protected from a short-to-battery event. The A4480 device is available in an 8-pin eSOIC package with exposed pad for enhanced thermal dissipation. It is lead (PB) free, with 100% matte tin leadframe plating. IO Voltage or VOUT A4480 GND VIN VOUT Enable from µP or VIN ENB POK VOUT VREG CP2 CP1 VIN July 5, 2018
APPLICATIONS
- Microcontroller power
- Transceivers (CAN, LIN, etc.) power supplies
- Sensors
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ABSOLUTE MAXIMUM RATINGS* Characteristic Symbol Notes Rating Unit VIN, ENB, CP1 VIN, VENB, VCP1 −0.3 to 40 V VCP2, VREG, VPOK VCP2, VREG, VPOK −0.3 to 20 V VOUT VOUT Independent of VIN −1 to 40 V Junction Temperature Range TJ −40 to 165 °C Storage Temperature Range Tstg −40 to 150 °C *Stresses beyond those listed in this table may cause permanent damage to the device. The absolute maximum ratings are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the Electrical Char- acteristics table is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. SELECTION GUIDE Part Number Temperature Range (°C) Package Leadframe Packing* A4480KLJTR-T –40 to 150 8-pin eSOIC with exposed thermal pad Matte Tin 3000 pieces per 7-in. reel *Contact Allegro for additional packing options. THERMAL CHARACTERISTICS*: May require derating at maximum conditions; see application section for optimization Characteristic Symbol Test Conditions* Value Unit Package Thermal Resistance (Junction to Ambient) RθJA eSOIC-8 with thermal pad (LJ) package on 4-layer PCB based on JEDEC standard 35 °C/W *Additional thermal information available on the Allegro website.
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 2: Functional Block Diagram VOUT FOLDBACK 5 V LDO Short to VBAT Protection VOUT UV/OV OCP TSD LDO2 Vcc Charge Pump GND CP1 CP2 VREG POK VIN ENB Pinout Diagram PAD VIN CP1 CP2 POK VREG VOUT GND ENB Terminal List Table Number Name Function 1 VIN Connection for input voltage. Connect a 2.2 µF capacitor from this pin to GND. Keep capacitor close to A4480.
2 CP1
Internal charge pump flying capacitor connection, connect a 0.47 µF ceramic capacitor from this pin to the CP2 pin. Keep capacitor close to A4480. 3 CP2 Internal charge pump flying capacitor connection, use a 0.47 µF capacitor to CP1. 4 POK Open-drain active-high Power OK signal. Use a 100 kΩ pull-up resistor to system IO rail or VOUT. 5 ENB Regulator active high enable input. Can be connected to VIN or logic level signal. 6 GND Ground pin.
7 VOUT
Regulated output pin. It is recommended to use a 4.7 µF ceramic capacitor from this pin to GND. Keep capacitor close to A4480.
8 VREG
Charge pump output which is input to internal linear regulator. Connect a 2.2 µF ceramic capacitor from this pin to GND. Keep capacitor close to A4480.
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Characteristics Symbol Test Conditions Min. Typ. Max. Units INPUT VOLTAGE Operating Input Voltage VIN ENB high and after VIN > 6.0 V 3.5 13.5 28 V VIN UVLO Start Voltage VIN(START) VIN rising, ENB high 3.1 – 3.45 V VIN UVLO Stop Voltage VIN(STOP) VIN falling, ENB high 2.6 – 2.9 V VIN UVLO Hysteresis VIN(HYS) VIN(START) – VIN(STOP) – 0.6 – V INPUT CURRENT Input Quiescent Current [1] IQ VIN = 13.5 V, ENB high – 4 – mA Input Sleep Supply Current [1] IQ(SLEEP) VIN = 13.5 V, ENB low – 1 10 µA CHARGE PUMP Output Voltage VREG ENB high, 5 mA ≤ IOUT ≤ 50 mA, VIN = 3.95 V 5.25 – 7 V ENB high, 5 mA ≤ IOUT ≤ 33 mA, VIN = 3.5 V 5.25 – 7 V Switching Frequency fSW – 325 – kHz Doubler to Pass Through Switchover VDOUBLER(H) VIN rising 7.8 – 8.65 V Pass Through to Step Down Switchover VSTEPDOWN(H) VIN rising 11.5 – 12.45 V Step Down to Pass Through Switchover VSTEPDOWN(L) VIN falling 10.5 – 11.7 V Pass Through to Doubler Switchover VDOUBLER(L) VIN falling 6.9 – 7.5 V
5 V LINEAR REGULATOR
Accuracy and Load Regulation VOUT 5 mA ≤ IOUT ≤ 50 mA, 3.95 V ≤ VIN ≤ 28 V 4.9 5.0 5.1 V Output Capacitance Range [2] COUT 3 – 10 µF Startup Time [2] tSTART COUT ≤ 4.7 µF, Load = 125 Ω ±5% (50 mA) 1.4 2.2 3.0 ms LOGIN ENABLE (ENB) INPUT ENB Threshold VENB(H) VENB rising – – 2.0 V VENB(L) VENB falling 0.8 – – V ENB Resistance RENB – 100 – kΩ ENB Filter/Deglitch Time td(EN,FILT) 10 15 20 µs ELECTRICAL CHARACTERISTICS [1]: Valid at 3.5 V ≤ VIN ≤ 28 V, −40°C ≤ TJ ≤ 150°C, unless otherwise specified Continued on next page...
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com OVERCURRENT PROTECTION (OCP) Current Limit [1] ILIM VOUT = 5 V −60 −100 –140 mA Foldback Current [1] IFBK VOUT = 0 V −15 −30 −45 mA THERMAL PROTECTION (TSD) Thermal Shutdown Threshold [2] TTSD TJ rising 165 − − °C Thermal Shutdown Hysteresis [2] THYS − 15 − °C VOUT OV/UV PROTECTIONS VOUT OV Thresholds VOV(H) VOUT rising, VIN = 13.5 V 5.15 5.33 5.50 V VOV(L) VOUT falling, VIN = 13.5 V – 5.30 – V VOUT OV Hysteresis VOV(HYS) VOV(H) – VOV(L), VIN = 13.5 V 15 – 50 mV VOUT UV Thresholds VUV(H) VOUT rising, VIN = 13.5 V – 4.71 – V VUV(L) VOUT falling, VIN = 13.5 V 4.50 4.68 4.85 V VOUT UV Hysteresis VUV(HYS) VUV(H) – VUV(L), VIN = 13.5 V 15 – 50 mV VOUT Output Disconnect Threshold VDISC VOUT rising, VIN = 13.5 V – 7.2 – V POK OUTPUTS POK Output Low Voltage VPOK(L) ENB high, VIN ≥ 3.5 V, IPOK = 1 mA – 150 400 mV POK Leakage Current [1] IPOK(LKG) VPOK = 3.3 V – – 35 µA OV and UV Filter/Deglitch Times [2] td(FILT) Applies to undervoltage of the VOUT voltages 10 15 20 µs [1] For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing), positive current is defined as going into the node or pin (sinking). [2] Ensured by design and characterization, not production tested. ELECTRICAL CHARACTERISTICS (continued) [1]: Valid at 3.5 V ≤ VIN ≤ 28 V, −40°C ≤ TJ ≤ 150°C, unless otherwise specified
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 3: Output Current Derating versus Input Voltage Figure 4: Timing Diagram (not to scale) VUV(H) td(filt) VUV(L) VENB(H) POK VOUT ENB VIN td(EN,FILT) VIN(STOP) VIN(START) VENB(L) VOV(H) VOV(L) VDISC td(filt)
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 5: Typical Application Schematic VIN GND VOUT GND POK SW1 A4480 CP12 VREG 8 ENB 5 VOUT 7 POK4 GND 6CP23 VIN1 PAD 2.2 µF 0.47 µF 2.2 µF 4.7 µF 100 kΩ BZX84-C24 Optional* BAS16 ENB * Diodes D1 and D2 are only required if A4480 must be enabled when VIN is greater than 28 V. If A4480 is already enabled before VIN is greater than 28 V or if A4480 is off then operation to 40 V is possible without D1 and D2 diodes.
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com PERFORMANCE DATA 4.90 4.92 4.94 4.96 4.98 5.00 5.02 5.04 5.06 5.08 5.10 3 8 13 18 23 28 Output Voltage (V) Input Voltage (V) 4.98 4.99 5.01 5.02 5.03 5.04 5.05 5.06 Output Voltage (V) Output Current (A) Vin = 3.5V Vin = 13V Vin = 28V 10% 20% 30% 40% 50% 60% 70% 80% Efficicency Output Current (A) Vin = 3.5V Vin = 13V 0 5 10 15 20 25 30 Temperature Rise (°C) Input Voltage (V) Line Regulation at 50 mA Load Regulation Typical Efficiency Estimated Temperature Rise
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com The A4480 contains a switching charge pump circuit, so care must be taken when placing this part on the system PCB. The four decoupling capacitors (C1, C2, C3, and C4) must be placed as close to the A4480 as possible. Figure 6 below shows the recom- mend layout. The input capacitor C1 is placed next to pin 1 of the A4480 (U1). It connects directly to the pin 6 using copper on the top side of the PCB. The charge pump flying capacitor (C2) connects directly to pins 2 and 3 of A4480. The VREG capacitor connects to pins 8 and 6; top-side copper should only be used for this connection. The output capacitor (C4) connects to pins 7 and 8. PCB LAYOUT GUIDELINES Figure 6: Typical Layout of the A4480 The vias under the A4480 are recommended for improved ther- mal performance. The ground copper plane should be a large as possible to reduce the junction to ambient thermal impedance of the A4480.
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3.30 Reference land pattern layout (reference IPC7351 SOIC127P600X175-9AM); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances; when mounting on a multilayer PCB, thermal vias at the exposed thermal pad land can improve thermal dissipation (reference EIA/JEDEC Standard JESD51-5) PCB Layout Reference ViewC 1.27 5.60 2.41 1.75 0.65
2.41 NOM
3.30 NOM
C SEATING PLANE
1.27 BSC
A Terminal #1 mark area B C B 2 1 C SEATING PLANE C0.10
0.25 BSC
1.04 REF
1.70 MAX
For Reference Only; not for tooling use (reference MS-012BA) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown 4.90 ±0.10 0.51 0.31 0.15 0.00 0.25 0.17 1.27 0.40 Exposed thermal pad (bottom surface); dimensions may vary with device A Branded Face Figure 7: Package LJ, 8-Pin eSOIC PACKAGE OUTLINE DRAWING
Wide Input 5 V , 50 mA, Automotive Regulator with Output Short-to-Battery Protection and Power OKA4480 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com For the latest version of this document, visit our website: www.allegromicro.com Copyright ©2018, Allegro MicroSystems, LLC Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copies of this document are considered uncontrolled documents.
Revision History
– June 1, 2017 Initial release 1 July 10, 2017 Updated Charge Pump Output Voltage test conditions (page 4), Accuracy and Load Regulation test conditions (page 4), and Figure 3 (page 6).