Monolithic Power Systems Inc. MP2633GR-P

Overview

MP2633GR-P from Monolithic Power Systems is a 1.5A synchronous switch-mode single-cell Li-ion/Li-polymer battery charger with integrated power path management and bidirectional boost OTG capability. It delivers precision 3.6V/4.2V charge voltage (±0.5%), programmable input current limit (400–2200mA), and 91% peak boost efficiency at 1A into 5V SYS output. Used in portable power banks and sub-battery systems where simultaneous charging and system powering is required.

For engineers reviewing the MP2633GR-P datasheet, MP2633GR-P pinout, MP2633GR-P application, or MP2633GR-P equivalent, key selection considerations include its dual-mode operation (charge/boost), thermal regulation at 120°C, input-voltage regulation loop, NTC-based battery temperature monitoring, and programmable charge/boost current via external resistors.

Technical Context

The MP2633GR-P implements a synchronous buck-boost architecture with integrated high-side PMOS (72mΩ) and low-side NMOS (70mΩ) power switches. Its control logic autonomously transitions between charge mode (VIN > VBATT+300mV), boost mode (MODE = HIGH, VIN = 0V), and sleep mode (VIN < 2V) based on PWIN voltage thresholds (0.8V/1.15V) and system voltage conditions.

It integrates five closed-loop regulators: input-current limit (via ILIM), input-voltage regulation (via REG feedback), charge current (via ISET), battery voltage (VBATT_FULL selectable via VB pin), and junction temperature (thermal foldback at 120°C, shutdown at 150°C). The device supports programmable switching frequency (600kHz or 1.2MHz) via FREQ pin and provides real-time status indication through open-drain ACOK, CHG, and BOOST pins.

Key Specifications

Pinout & Package

MP2633GR-P is housed in a thermally enhanced 4×4mm QFN-24 package with exposed thermal pad (PGND). The package supports high-power dissipation (θJA = 42°C/W) and requires PCB-level thermal vias under the exposed pad for reliable operation above 1A continuous load.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell battery charge and boost applications.

Compared with BQ25611DRTWR and IP2328TR, MP2633GR-P uniquely combines programmable input-voltage regulation, dual-chemistry charge voltage selection, and integrated NTC monitoring in a single QFN-24 package-making it optimal for compact, safety-critical, multi-source portable devices.

Availability

MP2633GR-P is available at Aetrix Electronics and suitable for USB power banks, smartphone sub-battery modules, and wireless headset charging cases requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2633GR-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 design centers in the US, China, and Taiwan.

The MP2633 product line targets portable energy management applications, integrating battery charging, power path control, and boost conversion to eliminate discrete components in space-constrained consumer and industrial devices.

FAQ

What is the function of the VB pin on MP2633GR-P?

The VB pin selects the battery full-charge voltage: connecting it to GND sets 3.6V for LiFePO₄ cells, while leaving it floating or tying it high selects 4.2V for standard Li-ion/Li-polymer. This configuration is latched at power-up and determines the CV termination threshold and recharge threshold (3.44V or 4.01V respectively), enabling single-chip support for two common battery chemistries without firmware changes.

How does MP2633GR-P handle input voltage regulation during high system load?

When system load draws excessive current from the input source, the MP2633GR-P monitors the REG pin voltage. If it drops below the internal 1.2V reference, the IC reduces charge current to maintain VIN above the programmed regulation point (e.g., 4.75V). This prevents USB port brownout and ensures stable SYS rail operation even when input current is shared between battery charging and system load.

Can MP2633GR-P operate without an external NTC thermistor?

Yes-the NTC pin can be left unconnected or tied to GND/VCC to disable temperature monitoring. However, doing so disables JEITA-compliant charging and removes battery over-temperature protection. For UL/IEC 62133 certification, an NCP18XH103-type NTC must be used with appropriate pull-up resistor to meet rising/falling threshold tolerances (66% ±1% at 0°C, 35% ±1% at 50°C).

What is the minimum input voltage required to enter charge mode?

Charge mode activates when PWIN voltage is between 0.8V and 1.15V AND VIN exceeds VBATT + 300mV. Since VBATT can be as low as 2.5V during trickle charge, the effective minimum VIN is 2.8V-but stable operation requires VIN ≥4.5V per datasheet specifications. Below 4.5V, input-current limiting becomes aggressive and may prevent full 1.5A charging.

How does the MP2633GR-P respond to a SYS short-circuit in boost mode?

Upon detecting SYS short-circuit (via CSP/CSN current sense), MP2633GR-P immediately disconnects the SYS rail using internal power switches, pulls BOOST low, and enters fault state. After 1ms blanking time, it attempts auto-recovery: if the short is removed, SYS re-enables within 100ms; if persistent, it cycles recovery attempts every 100ms until fault clears-ensuring robustness in consumer-grade OTG applications.

Is the MP2633GR-P compatible with USB Battery Charging (BC) 1.2 specification?

No-the MP2633GR-P does not implement USB BC 1.2 D+/D− detection. It relies on PWIN voltage sensing (0.8–1.15V window) to detect valid input, making it compatible with standard 5V USB adapters but not with proprietary BC chargers that require data-line signaling. For BC 1.2 support, external USB ID detection ICs like TUSB320 must be added.

What is the purpose of the TMR pin and how is it configured?

The TMR pin connects to a timing capacitor (typically 0.1µF) to set the oscillator period for charge timer backup protection. With CTMR = 0.1µF, total charge time is 360 minutes and trickle-charge time is 60 minutes. Shorting TMR to GND disables the timer function entirely, allowing indefinite charging-useful in applications where battery health monitoring is handled externally.