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PMIC for Automotive Camera BD86852MUF-C

PMIC for Automotive Camera BD86852MUF-C
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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 - 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...

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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...

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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...

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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....

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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,...

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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...

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PMIC for Automotive Camera BD86852MUF-C 46Pages

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PMIC for Automotive Camera BD86852MUF-C
46Pages