Monolithic Power Systems Inc. MP28160GC-P

Overview

MP28160GC-P from Monolithic Power Systems is a fully integrated 2.5V–5.5V input, 3.3V fixed-output buck-boost DC/DC converter delivering up to 500mA continuous current in a 1.4mm × 1.8mm CSP-12 package. It employs current-mode control with 1.8MHz fixed-frequency PWM, supports seamless buck/boost/buck-boost transitions, and integrates dual MOSFETs, VCC LDO, and full fault protection - enabling compact power delivery in USB-C cables and portable devices.

For engineers reviewing the MP28160GC-P datasheet, MP28160GC-P pinout, MP28160GC-P application, or MP28160GC-P equivalent, key selection criteria include its 3.3V fixed output, 1ms soft-start, hiccup OCP, 1µA shutdown current, and CSP-12 thermal performance - critical for space-constrained, battery-powered systems requiring stable 3.3V rail generation across variable input sources.

Technical Context

The MP28160GC-P implements a synchronous four-switch buck-boost topology with independent buck-leg (SWA/SWB) and boost-leg (SWC/SWD) control, using a shared current-sense ramp and dual error amplifiers (VC-Buck/VC-Boost) to manage mode transitions. Its UVLO threshold is 2.25V (rising), with 150mV hysteresis, ensuring reliable start-up from weak batteries or partially charged USB sources.

Operation includes auto PFM/PWM light-load mode, internal 1.8MHz oscillator (±19%), and analog ground (AGND) separation for noise-sensitive feedback. The VCC LDO (5V ±5%) powers internal circuitry and can be biased by VIN or VOUT, while EN's internal 600kΩ pull-down enables default-on functionality without external biasing.

Key Specifications

Pinout & Package

MP28160GC-P uses a wafer-level chip-scale package (CSP-12) measuring 1.4mm × 1.8mm with 0.4mm pitch, optimized for ultra-thin PCBs and thermal performance via direct die attachment. The package features exposed thermal pad on bottom (not electrically connected) and requires controlled reflow per JEDEC MO-211.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost regulator applications.

Compared with TPS63802DLCT and LT8337EDDB#TRMPBF, MP28160GC-P offers the smallest footprint (1.4×1.8mm), lowest quiescent current (280µA), and highest integration (integrated MOSFETs + VCC LDO + fixed 3.3V), making it optimal for space- and efficiency-critical portable interfaces where output voltage is invariant.

Availability

MP28160GC-P is available at Aetrix Electronics and suitable for USB-C cable assemblies, Thunderbolt interface modules, and portable diagnostic equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP28160GC-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP28160GC-P belongs to MPS's ultra-compact buck-boost regulator product line, designed specifically for USB-C, Thunderbolt, and portable electronics where minimal footprint, high efficiency across input range, and robust fault protection are mandatory.

FAQ

What is the recommended input capacitor for MP28160GC-P?

A minimum 10µF X5R/X7R ceramic capacitor rated ≥6.3V must be placed within 2mm of the IN pin. This value ensures stable operation under worst-case 5.5V input and 500mA load transients, as validated in the typical application circuit (Figure 4). Larger values improve hold-up time but do not affect regulation stability.

Does MP28160GC-P require external compensation components?

No. MP28160GC-P uses internal compensation optimized for the 1µH inductor and specified output capacitor values (2×22µF). Adding external compensation risks instability and violates the validated design; the device achieves phase margin >45° across temperature and load per characterization data (page 6).

How does the EN pin behave during power-up?

EN has an internal 600kΩ pull-down resistor, so the device powers up automatically when VIN exceeds 2.25V UVLO threshold. Driving EN high (>1.2V) disables the IC and reduces supply current to 1µA; floating EN enables operation. No external pull-up/down is required for default-on behavior.

Can MP28160GC-P operate with input voltage equal to output voltage?

Yes. In buck-boost region (VIN ≈ VOUT = 3.3V), the controller dynamically interleaves buck and boost phases using offset current ramp signals, maintaining regulation without dropout. Efficiency remains >88% at 3.3V input/3.3V output per Figure 6, confirming true 1:1 operation capability.

What thermal derating applies to MP28160GC-P at 85°C ambient?

With θJA = 110°C/W on a 4-layer JEDEC board, maximum continuous power dissipation drops to 590mW at 85°C ambient (PD = (125°C − 85°C)/110°C/W). At 500mA output and 3.3V, this corresponds to ~1.65W input power - well within safe limits given typical 90% efficiency, yielding ~125mW dissipation.

Is the RSV pin mandatory to connect?

No. RSV (pin D2) is reserved and must be left floating or tied to GND per datasheet guidance (page 3). It has no electrical function in standard operation, and connecting it to any voltage rail may cause undefined behavior or damage.

What happens during output short-circuit condition?

When VOUT drops below 60% of nominal (1.98V), MP28160GC-P enters hiccup mode: switching stops for ~12ms, then attempts soft restart. If short persists, cycling repeats. Internal 1kΩ OVP discharge resistor activates during fault to rapidly collapse output voltage, limiting energy dissipation in the short path.