Monolithic Power Systems Inc. MP4057AGK-P

Overview

MP4057AGK-P from Monolithic Power Systems is a single-chip, single-stage primary-side regulated (PSR) LED driver IC with integrated 3.3V LDO output for MCU/wireless modules, operating in constant-current (CC) and constant-voltage (CV) modes, achieving >0.9 power factor, 5% deep dimming, and ultra-low 30mW no-load standby loss in smart Zigbee/Bluetooth lighting systems.

For engineers reviewing the MP4057AGK-P datasheet, MP4057AGK-P pinout, MP4057AGK-P application, or MP4057AGK-P equivalent, this device delivers verified PSR-based LED current regulation without secondary-side feedback, supports valley-switching for efficiency, integrates OVP/SCP/OCP/OTP protection, and enables flicker-free CC–CV transition in smart lighting control architectures.

Technical Context

The MP4057AGK-P implements proprietary real-current control using primary-side sensing via the S pin to regulate LED current without optocoupler or secondary-side shunt, while its dual-mode operation (CC/CV) is determined by DIM pin logic level - low forces CV mode for MCU power delivery, high enables CC for LED drive. Its valley-switching gate control reduces MOSFET turn-on loss and EMI noise during CC operation.

Internal architecture includes a dual-loop error amplifier (EA) with separate clamp voltages (VCOMP_H_CC = 4.0V, VCOMP_H_CV = 2.65V), dedicated ZCD circuitry with blanking and OVP detection, and intelligent frequency modulation that drops switching frequency to ~400Hz in no-load CV mode to achieve 30mW standby loss. The integrated 3.3V/100mA LDO (VO) powers external wireless modules independently of LED load state.

Key Specifications

Pinout & Package

MP4057AGK-P is packaged in MSOP-10 (exposed pad), optimized for compact smart LED drivers with thermal performance θJA = 150°C/W. Pin functions are validated per Monolithic Power Systems Rev. 1.01 datasheet (2018).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4056AGS, MP4057AGK-P adds NLP-driven standby optimization and higher VO current for wireless modules; versus BP5778E, it eliminates optocoupler dependency and reduces layout sensitivity while delivering tighter CC regulation (±3% vs. ±5%) and lower EMI.

Availability

MP4057AGK-P is available at Aetrix Electronics and suitable for Zigbee smart bulbs, Bluetooth mesh downlights, and DALI-2 emergency drivers requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP4057AGK-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with over 20 years of leadership in DC–DC converters, LED drivers, and motor drivers.

The MP4057A product line targets smart LED lighting systems requiring integrated MCU power, PSR accuracy, and regulatory-compliant standby loss - designed specifically for IoT-connected luminaires with constrained PCB space and thermal budgets.

FAQ

What is the function of the NLP pin on MP4057AGK-P?

The NLP pin controls an external depletion-mode N-FET to disable high-voltage current injection during standby, directly enabling the 30mW no-load loss specification. It is asserted low during CV mode to cut off the HV charging path, reducing leakage and improving energy efficiency certification margins without requiring additional control logic.

How does MP4057AGK-P achieve flicker-free transition between CC and CV modes?

Hardware-level synchronization between the VO regulation loop and LED current control ensures VO remains above 3.1V and COMP voltage stays within clamped bounds (1.21V–4.0V) during mode change. The DIM pin triggers immediate reconfiguration of error amplifier reference and switching frequency profile, eliminating transient voltage droop or current discontinuity.

Can MP4057AGK-P operate without an auxiliary winding?

No - the ZCD pin requires connection to an auxiliary winding for valley switching detection, OVP, and brown-out protection. However, the internal VDD charging circuit (via D pin) eliminates the need for a separate startup winding, reducing transformer complexity compared to conventional PSR controllers.

What is the maximum allowable LED string voltage supported by MP4057AGK-P?

MP4057AGK-P does not impose a fixed LED string voltage limit; instead, it depends on transformer turns ratio and VCC winding design. In typical 230VAC applications with 7-series LEDs (21V), the maximum achievable VOUT is ~50V when using appropriate transformer design and external MOSFET rating - confirmed on EV4057A-K-00A evaluation board.

Does MP4057AGK-P support analog dimming via the DIM pin?

No - the DIM pin accepts only digital PWM signals (0.3V/1.25V thresholds) or static logic levels to select CC/CV mode. Analog dimming is not supported; brightness control is implemented exclusively via PWM duty cycle, with linear current scaling from 5% to 100% verified across 100–2000Hz input frequencies.

What thermal derating applies to MP4057AGK-P in MSOP-10 package?

In MSOP-10, continuous power dissipation is limited to 0.83W at TA = 25°C (θJA = 150°C/W). Above 25°C ambient, power must be reduced linearly: PD(MAX) = (150°C − TA)/150°C/W. At 70°C ambient, max dissipation drops to 0.53W - verified by thermal imaging on EV4057A-K-00A under full load.

Is the VO output short-circuit protected?

Yes - VO includes internal current limiting and thermal foldback. Under short-circuit, VO current is clamped to ~120mA and VO voltage collapses to <0.5V; recovery occurs automatically after thermal cooldown, with no latch or external reset required - validated per Section 8.3 of Rev. 1.01 datasheet.