Microchip Technology HV9803BLG-G

Overview

HV9803BLG-G from Microchip Technology is an open-loop, average-mode constant-current LED driver IC operating in fixed off-time mode for buck topology. It delivers ±2% LED current accuracy, supports 7–16V input, features linear (0–3V) and PWM dimming inputs, and provides hiccup-mode short-circuit protection - used in LCD backlighting and general lighting systems with external N-channel MOSFET switching.

For engineers reviewing the HV9803BLG-G datasheet, HV9803BLG-G pinout, HV9803BLG-G application, or HV9803BLG-G equivalent, key selection considerations include its average-current control architecture (no loop compensation required), 284–296 mV CS reference voltage, programmable off-time via RT resistor, 85% max duty cycle limit, and integrated UVLO with 6.45–6.95 V threshold.

Technical Context

The HV9803BLG-G implements a unique iterative average-current control law that samples propagation delay during one switching cycle and replicates it in the next to enable precise average inductor current regulation without high-side sensing. Its auto-zero circuit cancels both input offset voltage and comparator propagation delay error by dynamically adjusting the CS reference level each cycle.

This IC uses constant off-time (COT) operation governed by an external RT-to-GND resistor, with TOFF ranging from 0.8–11.3 μs depending on RT value. The gate driver delivers ±165 mA sourcing/sinking capability and supports MOSFETs with QG < 25 nC (≤100 kHz) or < 15 nC (>100 kHz), while maintaining stable LED current independent of inductance, switching frequency, or output voltage variation.

Key Specifications

Pinout & Package

HV9803BLG-G is housed in an 8-lead SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC footprint (5.3 mm × 6.2 mm, 1.27 mm pitch), RoHS-compliant matte tin (Pb-free) finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with AL8862SP-13 and MPQ4425AGU-AEC1-P, the HV9803BLG-G offers superior current accuracy (±2% vs. ±5%), programmable off-time for frequency optimization, dual dimming interface, and hiccup-mode protection - making it optimal for precision backlighting and industrial LED systems where external MOSFET control and thermal resilience are prioritized.

Availability

HV9803BLG-G is available at Aetrix Electronics and suitable for LCD panel backlighting, industrial general lighting, and automotive interior lighting requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for HV9803BLG-G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with design centers and manufacturing facilities across the Americas, Asia, and Europe.

The HV9803BLG-G belongs to Microchip's high-voltage LED driver product line, engineered specifically for cost-sensitive, high-accuracy constant-current applications in backlighting and general lighting where open-loop average-mode control eliminates compensation complexity.

FAQ

What is the primary control architecture used in the HV9803BLG-G?

The HV9803BLG-G employs open-loop average-mode current control with fixed off-time switching. It achieves ±2% LED current accuracy by using an auto-zero circuit to cancel propagation delay and input offset voltage errors in the current sense comparator - eliminating the need for loop compensation or high-side current sensing. This architecture is implemented entirely within the HV9803BLG-G and forms the core of its regulation mechanism.

How does the HV9803BLG-G implement short-circuit protection?

The HV9803BLG-G uses hiccup-mode short-circuit protection triggered when the CS pin voltage exceeds VLIM (1.57–1.93 V). Upon detection, the gate output shuts off and a restart delay is generated via an RC network connected to the UVLO pin. The capacitor CSKIP discharges below 200 mV, then recharges to the UVLO start threshold (1.17–1.29 V) before resuming operation - preventing thermal damage during sustained fault conditions. This behavior is intrinsic to the HV9803BLG-G design.

Can the HV9803BLG-G operate with both linear and PWM dimming simultaneously?

Yes, the HV9803BLG-G supports concurrent linear and PWM dimming: the LD pin accepts a 0–3 V analog reference to set baseline LED current, while the PWMD pin enables high-speed digital dimming (e.g., for flicker-free brightness modulation). The HV9803BLG-G internally combines both signals - allowing smooth analog adjustment overlaid with rapid PWM control - without external mixing circuitry or firmware intervention.

What is the function of the RT pin on the HV9803BLG-G?

The RT pin on the HV9803BLG-G sets the gate driver's off-time (TOFF) via an external resistor to GND. TOFF ranges from 0.8 μs (RT = 25 kΩ) to 11.3 μs (RT = 250 kΩ), directly determining switching frequency. The HV9803BLG-G includes RT overcurrent protection (IRT(LIM) = 2.8 mA typical) and short-circuit immunity - ensuring robust timing control without external supervision.

Does the HV9803BLG-G require external compensation components?

No, the HV9803BLG-G does not require external compensation components. Its average-mode control architecture with auto-zero correction and fixed off-time operation achieves stable LED current regulation without loop compensation networks. This eliminates the need for external capacitors or resistors typically used in voltage-mode or peak-current-mode controllers - simplifying design and reducing BOM count for the HV9803BLG-G implementation.