LM53601LQDSXRQ1

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1. Describe

The LM53600-Q1 and LM53601LQDSXRQ1 synchronous buck regulator devices are optimized for automotive applications and are available with 5V, 3.3V or adjustable output voltages. The LM53600-Q1 supports load currents up to 650 mA, while the LM53601LQDSXRQ1 supports up to 1000 mA. Advanced high-speed circuitry allows the LM53600-Q1 and LM53601LQDSXRQ1 devices to regulate from an 18 V input to a 3.3 V output at a fixed frequency of 2.1 MHz. An innovative architecture allows the device to regulate a 3.3 V output from an input voltage of only 3.8 V. Input voltage range up to 36 V and transient tolerance up to 42 V simplify input surge protection design. An open-drain reset output with filtering and delayed release provides a true indication of system status. This feature eliminates the need for additional monitoring components, saving cost and board space. Seamless transitions between PWM and PFM modes and a quiescent current of only 23 µA ensure high efficiency and excellent transient response at all loads. Few external components are required, resulting in a compact PCB layout. Although the LM53600-Q1 and LM53601LQDSXRQ1 devices are rated Q1, electrical characteristics are guaranteed over a junction temperature range of –40°C to 150°C.

2. Feature

    1. Compliant with automotive application requirements

    2. AEC-Q100 qualified with the following results:

        – Device temperature grade 1: –40°C to 125°C ambient operating temperature range

        – Device HBM classification level 2

        – Equipment CDM classification level C5

    3. –40°C to 150°C junction temperature range (available)

    4. Wide operating input voltage: 3.55 V to 36 V (transient to 42 V)

    5. Spread spectrum option available

    6. 2.1MHz fixed switching frequency

    7. Low quiescent current: 23 μA

    8. Shutdown current: 1.8 µA

    9. Adjustable 3.3V or 5V output

  10. Maximum current load: 650 mA for LM53600-Q1, 1000 mA for LM53601-Q1

  11. Pin selectable forced PWM mode

  12. RESET output with filter and delayed release

  13. External frequency synchronization

  14. Internal compensation, soft-start, current limit and UVLO

  15. 10-lead, 3mm × 3mm SON package with wettable and non-wettable sides

3. Application

    1. Automotive camera applications

    2. Car driver assistance systems

    3. Automotive body applications

4. Pin configuration

5. Pin Description

6. Function description

The control scheme of the LM53600-Q1 and LM53601-Q1 devices allows this part to operate over a wide range of conditions with fewer external components. Peak current mode control allows a wide range of input voltage and output capacitor values while maintaining a constant switching frequency. Stable operation is maintained while changing the output capacitance during operation. This allows for use in systems that require high performance during load transients and have a load switch that can remove the load as the operating state of the system changes. The shortest minimum on and off times ensure constant frequency regulation over a wide range of conversion ratios. These turn-on and turn-off times allow for a 13% to 77% duty cycle window at 2.1MHz switching frequency. The architecture uses frequency foldback to achieve low dropout voltage maintaining output regulation as the input voltage drops close to the output voltage. The frequency foldback is smooth and continuous, and activates when the off time is close to its minimum value. Under these conditions, the LM53600-Q1 and LM53601-Q1 devices operate much like a constant off-time converter, allowing a maximum duty cycle of 97%, allowing the output voltage to be regulated with a 600mV dropout. If the input voltage exceeds about 21 V, the frequency decreases smoothly as the input voltage changes. This frequency reduction allows output voltage regulation and current mode control to operate at duty cycles below 13%. Since current mode control continues to be insensitive to output capacitance at high input voltages. If the input voltage falls below 18 V, this form of foldback will not be activated to ensure constant frequency operation under normal automotive operating conditions. There are two settings for high input voltage foldback; since the adjustable output voltage version folds back at high input voltage as if the output voltage was 3.3 V, a larger inductor is required if an adjustable device with an output voltage higher than 4.2 V is used and output capacitor. If a 4.7 µH inductor is used in the system to provide a larger 4.2V output by using an adjustable device, the converter remains stable, but may not be achievable when operating at high input voltages (eg 36V) due to excessive inductor current ripple full output current. As the load current decreases, the LM53600-Q1 and LM53601-Q1 devices transition to light load mode if SYNC/MODE is low. In this mode, diode emulation is used to reduce the RMS inductor current and reduce the switching frequency. Additionally, the fixed voltage version does not require a voltage divider to FB, saving additional power.