1. General Overview

️· Type: Synchronous Step-Down Converter
️· Function: Converts higher voltage DC to a lower voltage DC, efficiently.
️· Target Applications: Likely for powering digital circuits, microcontrollers, or other electronics requiring a stable, lower voltage supply.

2. Input & Enable

️· Enable Input Low Voltage (VILEN): 1.1V to 1.5V. The converter turns *off* if the enable pin voltage is below this range.
️· Enable Hysteresis: 250mV. This provides stability in the enable input.
️· VCC Under Voltage Lockout (VCCVth): 3.8V rising. The converter shuts down if the internal VCC voltage drops below this level.
️· VCC Hysteresis: 500mV.

3. Feedback & Reference

️· Reference Voltage (VREF): 602mV to 620mV (over -40°C to +125°C temperature range). This is the core voltage that the converter regulates.
️· Feedback Voltage (VFB) Thresholds:
- Power Good Rising Threshold: 87% to 94% of VFB (regulated feedback voltage). The "Power Good" signal asserts when the output voltage reaches this level.
- Power Good Falling Threshold: 80% of VFB. The "Power Good" signal de-asserts when the output falls below this.
- Overvoltage Latch Threshold (VOVP LATCH): 127% to 133% of VFB. The converter latches off if the feedback voltage exceeds this.
- Overvoltage Non-Latch Threshold: 117% to 123% of VFB.
️· Feedback Current (IFB): 50nA to 100nA (at 611mV VFB).

4. Power Delivery (Key Values - Highly Dependent on Part Number Suffix!)

️· High-side Peak Current Limit (ILIMIT_PEAK): Varies significantly by part suffix. Examples: 13A to 21.6A.
️· Low-side Valley Current Limit (ILIMIT_VALLEY): Varies significantly by part suffix. Examples: 4A to 30A.
️· Low-side Negative Current Limit (ILIMIT_NEGATIVE): Varies significantly, usually between -1A and -6.6A.
️· Power Good Leakage Current (IPG LEAK): 10nA.

5. Protection

️· Thermal Shutdown (TSD): 150°C. The converter shuts down if the internal temperature reaches this.
️· Thermal Shutdown Hysteresis: 25°C.
️· Overvoltage Latch Threshold (VOVP LATCH): See Feedback Section (dependent on VFB).

6. Timing

️· One-Shot On Time (TON): 250ns.
️· Minimum On Time (TON_MIN): 20ns to 40ns, depending on part number.
️· Minimum Off Time (TOFF_MIN): 50ns to 420ns, depending on part number.
️· Power Good Delay (PGTd): 2.5ms.

IMPORTANT NOTES AND CAVEATS:

️· PART NUMBER VARIATIONS: The *single most crucial thing* to understand is that the electrical characteristics (especially current limits, and some timing values) vary significantly depending on the part number suffix. The datasheet provides different values based on the part number suffix (e.g., GLE, GVE, HGLE, etc.). You *must* identify the exact part number you are using and refer to the correct section of the datasheet for its specific values.
️· Guaranteed by Design: Several values are labeled "Guaranteed by Design." This means they're not measured in production testing but are ensured through the design process.
️· Datasheet Sections: Always refer to the original datasheet for detailed information, graphs, and application circuits. This summary is intended as a high-level overview.
️· VFB Dependency: Several protection and timing features (like overvoltage latching, and power good) are relative to the *regulated feedback voltage (VFB)*. VFB will depend on the feedback network used in the application.
️· Temperature Dependence: Certain values (such as VREF and some thresholds) are temperature dependent.