Description
The RT8207M is a versatile power management IC used in notebook or system boards to generate memory supply rails (VDDQ, VTT) with accurate regulation and integrated protection.
Functionality & Architecture
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It integrates a synchronous PWM buck converter to step down battery or system bus voltage to the required DDR memory voltage (VDDQ).
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It also incorporates a 1.5 A sink/source tracking linear regulator (LDO) for the VTT rail, used as a termination or reference for DDR memory.
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A buffered low-noise reference (VTTREF) is available for memory termination circuits.
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Supports fixed memory voltages (e.g. 1.8 V for DDR II, 1.5 V for DDR III) and adjustable output (0.75 V to 3.3 V) via external resistor divider.
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Uses low-side R_DS(on) sensing to implement resistor-programmable current limit (cycle-by-cycle).
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The control scheme is constant-on-time PWM, which gives fast transient response (~100 ns load-step latency).
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Frequency is programmable via an external resistor.
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Includes power‑good (PGOOD) output to signal when VDDQ is within regulation.
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Supports discharge / tracking modes for VDDQ and VTT when entering low-power or sleep states (S3, S4/S5).
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It ensures protection through over‑voltage, under‑voltage, over‑current, and thermal shutdown mechanisms.
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The device is available in WQFN-20 (3 × 3 mm) package.
Electrical & Operational Highlights
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Input (battery / system) voltage range: ~4.5 V to 26 V
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VDDQ regulation accuracy: ±1 % over line and load
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Soft-start & ramp: Ramped current limit during startup to prevent overshoot
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Discharge behavior: When commanded, output rails (VDDQ, VTT) are actively discharged to safe states
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Protection:
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Over-current / current limit (R_DS sensing)
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Over-voltage / under-voltage detection
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Thermal protection (latched)
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Sleep / standby behavior: In low-power modes, the LDO and tracking behavior ensure memory rails are set properly or placed in high impedance states.
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Package & pinouts: Offers standard memory supply controller pin configuration, with boot, gate drive, phase pins, and tracking control signals.
No Return / No Exchange Policy / No Warranty.
Please check the model number and match it with your Product.
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