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PMIC for Automotive Camera BD86852MUF-C

PMIC for Automotive Camera BD86852MUF-C

Product catalog summary

General Description: The BD86852MUF-C is a power management IC designed for automotive camera systems, featuring a primary buck converter, two secondary buck converters, an external linear regulator control block, and a power-on reset function. It supports various image sensor power supplies with selectable output voltage and sequence, housed in a compact VQFN24FV4040 package.

Features: AEC-Q100 qualified, the IC supports functional safety for automotive applications, includes high-efficiency synchronous rectification, protection functions, spread spectrum for EMC, and fail detection pins. Output voltage and sequence are selectable.

Key Specifications: Operates with a power supply voltage range of 4.0 V to 18 V, with a maximum rating of 20 V. Output voltages are 3.3 V or 3.9 V for VO1, 1.1 V or 1.2 V for VO2, and 1.8 V for VO3, each with a ±2% tolerance. Maximum output currents are 2 A for VO1 and 1 A for VO2 and VO3. The switching frequency is 2.2 MHz, and the operating temperature range is -40 °C to +125 °C.

Applications: Suitable for ADAS and camera systems, including automotive and security cameras using CMOS sensors.

Block Diagrams: Includes detailed block diagrams for the internal structure, including primary and secondary DC/DC converters, internal regulator, reference voltage blocks, and various protection and control blocks.

Description of Blocks: Key blocks include the internal regulator (VREG), reference voltage blocks (VREF1 and VREF2), under-voltage lock-out (UVLO), thermal shutdown protection (TSD), oscillator (OSC) with spread spectrum clock generator (SSCG), external LDO controller, error amplifier (ERRAMP), and protection features like over-voltage protection (VSOVP) and over-current protection (OCP).

Protection Features: Comprehensive protection features include thermal shutdown, over-voltage detection, lower voltage detection, and over-current protection to ensure reliable operation.

Control Logic Block: Manages ON/OFF sequence, protection features, and output voltage settings based on MODE pin configurations. Various modes (A-mode to H-mode) are detailed with specific voltage outputs and sequences.

Protection Mechanisms: Includes self-restart and timer-latch protection features. Self-restart activates under certain conditions, turning off outputs and restarting after 10 ms. Timer-latch turns off all outputs and requires specific conditions to reset.

Absolute Maximum Ratings: Specifies voltage limits for various pins, storage temperature range, and maximum junction temperature. Exceeding these ratings can damage the IC.

Thermal Resistance: Values are provided for different PCB configurations, emphasizing thermal management to prevent exceeding maximum junction temperatures.

Recommended Operating Conditions: Operates within specified voltage and current ranges, with a switching frequency of 1.8 to 2.4 MHz and an operating temperature range of -40 to +125°C.

Electrical Characteristics: Detailed parameters for standby and operating currents, UVLO operating and release voltages, switching frequencies, and output voltage accuracies for DCDC1, DCDC2, DCDC3, and LDO.

Performance Curves: Graphs illustrate relationships between standby/operating current and power supply voltage, switching frequency and temperature, and output voltage regulation for different channels.

Specifications: Outlines typical performance curves for different temperatures and power supply voltages, including efficiency graphs for DC/DC converters at various output currents and voltages.

Procedures: Detailed timing charts illustrate start-up and shutdown sequences for different modes, emphasizing the role of the PGOOD signal and various voltage thresholds.

Component Selection: Guidelines for selecting inductors and capacitors, explaining the impact of inductor size on ripple current and output voltage ripple, recommending ceramic capacitors for their low ESR and good temperature characteristics.

PCB Layout Recommendations: Advises on optimal PCB layout practices, such as minimizing the distance between capacitors and the IC, and ensuring proper grounding connections.

Key Data from Graphs: Efficiency graphs show performance of DC/DC converters at different input voltages and output currents, highlighting efficiency range from 0.01 to 1 A. Start-up waveforms demonstrate voltage levels and timing intervals for each output.

Critical Information: Emphasizes the importance of proper component selection and PCB layout to ensure optimal performance, detailing power-up and power-down sequences critical for system stability.

Operational Notes:

Ensure correct polarity to prevent IC damage. Use an external diode for protection.
Design PCB for low impedance and use capacitors to ground at power supply pins.
Maintain all pins above ground voltage. Separate small-signal and large-current ground traces.
Manage inrush current during power-up, especially with multiple power supplies.
Discharge capacitors after testing and ensure IC is grounded during assembly.
Connect unused pins to power or ground to prevent unexpected IC operation.
Consider capacitance changes due to temperature and DC bias when selecting capacitors.
Protect ICs from light exposure to prevent photoelectric effects.
Products are compliant with ISO 26262 for automotive safety, supporting ASIL levels.

Precautions:

Consult ROHM for use in critical applications like medical or aerospace.
Verify product performance in extreme conditions.
Handle with care to prevent damage from static discharge.
Follow recommended storage and transportation conditions.

Precaution for Disposition: Products should be disposed of properly through an authorized industry waste company.

Precaution for Foreign Exchange and Foreign Trade Act: Products may fall under export control regulations. Consult with ROHM before exporting.

Precaution Regarding Intellectual Property Rights:

Information is for reference only and may infringe third-party rights.
ROHM is not liable for claims arising from combining products with other components or systems.
No license is granted under ROHM or third-party intellectual property rights.

Other Precautions:

Document reproduction requires ROHM's prior written consent.
Products cannot be modified without ROHM's consent.
Products and related information must not be used for military purposes.
Trademarks mentioned are owned by ROHM or third parties.

General Precaution:

Read and understand the document before using ROHM products. ROHM is not liable for misuse.
Information is current as of the issue date and may change. Confirm with a ROHM representative before use.
Information is provided "as is" without warranty of accuracy. ROHM is not liable for damages from inaccuracies.

Catalog excerpts

PMIC for Automotive Camera BD86852MUF-C-1

Datasheet Automotive Power Management IC PMIC for Automotive Camera BD86852MUF-C General Description BD86852MUF-C is a power management IC with primary buck converter (DC/DC1), secondary buck converters (DC/DC2 and DC/DC3), external linear regulator control block and the power-on reset function for CMOS sensor and image sensing power supply. Output voltage and sequence are selectable and applicable to various image sensor power supply. This device adopts small package VQFN24FV4040 which is optimal for camera module. In addition, this device has a pin that can be programmed to turn on/off the spread spectrum providing a lower noise regulated outputs.  Power Supply Voltage Rating: 20 V (Max)  Power Supply Voltage Range: 4.0 V to 18 V  Output Voltage: VO1: 3.3 V or 3.9 V (±2 %) VO2: 1.1 V or 1.2 V (±2 %) VO3: 1.8 V (±2 %)  Output Current: VO1: 2 A (Max) VO2: 1 A (Max) VO3: 1 A (Max)  Switching Frequency: 2.2 MHz (±200 kHz)  Stand-by Current: 0 μA (Typ)  Operating Ambient Temperature Range: -40 °C to +125 °C Package W (Typ) x D (Typ) x H (Max) VQFN24FV4040 4.0 mm x 4.0 mm x 1.0 mm AEC-Q100 Qualified(Note 1) Functional Safety Supportive Automotive Products Primary DC/DC (VO1) DC/DC with built-in FET High Efficiency with Synchronous Rectification Dual Secondary DC/DC (VO2, VO3) DC/DC with built-in FET High Efficiency with Synchronous Rectification Each Protection Function Spread Spectrum for EMC Fail Detection Pin (for each output) Selectable Output Voltage and Sequence VQFN24FV4040 Wettable Flank Package Applications  ADAS  Camera System (Automotive Camera and Security Camera) using CMOS Sensor Typical Application Circuit VCC PVCC 〇Product structure: Silicon integrated circuit www.rohm.com . © 2020 ROHM Co., Ltd. All rights reserved. TSZ22111 • 14 • 001 〇This product has no designed protection against radioactive rays.

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PMIC for Automotive Camera BD86852MUF-C-2

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PMIC for Automotive Camera BD86852MUF-C-3

DC/DC2 output voltage feedback Power supply Enable control input Internal regulator output Mode select DC/DC3 output voltage feedback Mode select External LDO voltage feedback Adjust switching frequency DC/DC1 output voltage feedback DC/DC1 high side driver supply pin Power Good (Note 3) (N-channel open-drain) External LDO enable control output - (Note 1) Connect to the GND pin or the VREG pin. (Note 2) If not in use, connect to the GND pin. (Note 3) If not in use, open. www.rohm.com © 2020 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001

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PMIC for Automotive Camera BD86852MUF-C-4

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PMIC for Automotive Camera BD86852MUF-C-5

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PMIC for Automotive Camera BD86852MUF-C-6

BD86852MUF-C Description of Blocks  Internal Regulator (VREG) Block VREG is the linear regulator for PMIC use only (Do not use it for other purposes.). The VREG pin needs an appropriate external bypath capacitor. This is controlled by the EN1 internal signal. When the EN pin voltage is more than 2.6 V, the EN1 signal becomes high, and when it’s less than 0.8 V, the EN1 signal becomes low. VREG stops when the EN1 signal and the CTL1 internal signal are low.  Reference Voltage (VREF1 and VREF2) Block Two independent reference voltages, one for the output voltage and the other for the voltage...

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PMIC for Automotive Camera BD86852MUF-C-7

BD86852MUF-C Description of Blocks – continued  Error Amplifier (ERRAMP) Block Error Amplifier with reference voltage and VO voltage divider input. Controls On Duty width of switching pulse by output of ERRAMP. Capacitor and resistor for phase compensation are fixed.  Slope (SLP) Block The saw tooth wave generator for the duty modulation. The summation of the saw tooth waveform and the upper FET current information will be sent to PWM.  Current Comparator (CUR_SENSE) Block The CUR_SENSE block outputs a waveform depending on the current of the inductance.  Soft Start (SS) Block The SS block...

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PMIC for Automotive Camera BD86852MUF-C-8

BD86852MUF-C Description of Blocks – continued  CONTROL LOGIC Block This block controls CTL1, CTL2, CTL3, and CTL4, ON/OFF sequence, PGOOD and each protection. When the EN2 internal signal is high and UVLO_VCC and UVLO_VREG are released, CONTROL_LOGIC block is active. When UVLO_VCC or UVLO_VREG is detected, CONTROL LOGIG Block will reset and initialize. Output voltage and the sequence are decided by the combination of MODE pin (MODE0, MODE1 and MODE2) logic. It is necessary to connect the MODE pins to VREG or GND. The following table is details of output voltage and ON/OFF sequences. Table 1....

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PMIC for Automotive Camera BD86852MUF-C-9

BD86852MUF-C Description of Blocks - continued  CONTROL LOGIC Block (Protection of Self-Restart) When the EN pin is 0.8 V or less, IC is in the state of stand-by. In this state, the internal regulator and all outputs are off, and secondary DC/DC rails discharge function is active. The following table shows the relation of protection (Self-Restart). Table 2. Protection of Self-Restart Protection All output is off. High side FET is off. Self-Restart after 10 ms. Low side FET is off. High and Low sides FET are off. Self-Restart after 10 ms. When more than 10 ms, all output is off. Self-Restart...

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PMIC for Automotive Camera BD86852MUF-C-10

BD86852MUF-C Description of Blocks - continued  CONTROL LOGIC Block (Protection of Timer-Latch) When the protection detection passes for 10 ms (Typ) or more, “Timer-Latch” works and all output turns off and PGOOD turns to low. The cancellation method of “Timer-Latch” is to activate either UVLO_VCC, UVLO_VREG or TSD, or to turn EN low. The following table shows the relation of protection (Timer-Latch). Table 3. Protection of Timer-Latch Protection UVLO_VCC UVLO_VREG OCPH OCPN Notice All output is off. Release Timer-Latch All output is off. Release Timer-Latch When protection detect 8 times, Timer-Latch...

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PMIC for Automotive Camera BD86852MUF-C-11

BD86852MUF-C Absolute Maximum Ratings Parameter Power Supply Voltage(Note 1) VVCC, VPVCC Power Supply Voltage(Note 1) MODE Pin Voltage Storage Temperature Range Maximum Junction Temperature Caution 1: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings. Caution 2: Should by any chance the maximum junction temperature...

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