MP5032 - 3A USB Current-Limit Switch with QC 3.0 ID | MPS
MPN: MP5032 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.95 | $0.95 |
| 10 | $0.82 | $8.20 |
| 100 | $0.65 | $65.00 |
| 500 | $0.52 | $260.00 |
| 1,000 | $0.44 | $440.00 |
| 3,000 | $0.36 | $1,080.00 |
MP5032 Overview
A USB current-limit switch is a power-management load switch that sits between a DC supply rail (typically 5V or a higher adapter voltage) and a USB VBUS output. It enforces a programmable current limit, protects upstream components from over-current events, and increasingly includes protocol handshaking that allows the downstream port to advertise the voltages and currents it can deliver. The MP5032 belongs to the broader USB power delivery (USB-PD) and proprietary fast-charging IC family, sitting below full USB-PD controllers in complexity but supporting the most common legacy and QC3.0 handshake schemes used by smartphone and tablet charging adapters.
Key features include a hiccup current-limit architecture, line-drop compensation that maintains accurate USB cable-delivered voltage, input over-voltage protection (OVP), thermal shutdown, and an active-high enable input. The integrated current-limit and ID functions let the designer replace a discrete load switch plus external USB-IF detection chip with a single IC.
Internally, the part uses a low-RDS(ON) N-channel MOSFET pass element, a precision current-sense amplifier, and a state machine that decodes BC1.2, divider-mode, and QC3.0 voltage requests on the D+/D- lines. The hiccup behavior auto-recovers from sustained over-current faults without latching the system off, which is important for hot-plug USB events.
Typical applications include USB wall chargers, travel adapters, automotive USB power ports, USB hub downstream ports, and any 5V (or higher adapter) rail that must support Quick Charge 3.0 handsets or legacy DCP phones. The wide input range also supports 12V automotive environments after upstream regulation.
When designing with this device, follow MPS layout guidance: place the input capacitor immediately adjacent to IN, keep the current-limit set resistor close to ILIM, and ensure the exposed thermal pad (when present) sees a generous copper pour. Verify QC3.0 conformance with the latest Qualcomm compliance checklist.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the brief block-diagram information in the manufacturer datasheet.
Drop-in alternatives for MP5032 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MP5031
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP5032GJ
✅ Drop-In📋 Reference alternative (not in catalog)
MP5032GJ-P
✅ Drop-In📋 Reference alternative (not in catalog)
MP5030
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MP5032 Maximum Ratings & Electrical Characteristics
| Product Type | USB current-limit switch with charging-port identification |
| Continuous Output Current | 3 A |
| Current Limit | Programmable via external resistor |
| Current-Limit Behavior | Hiccup (auto-recovery) |
| Charging Protocols Supported | BC1.2, Divider mode, 1.2V/1.2V mode, Qualcomm Quick Charge 3.0 |
| Line-Drop Compensation | Yes (linear) |
| Input Over-Voltage Protection | Yes |
| Thermal Shutdown | Yes |
| Enable Input | Active high |
| Package | TSOT-23-6 (GJ) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Pass Element | Internal N-channel MOSFET |
MP5032 Pin Configuration
| Pin 1 | IN — Input supply voltage to the USB switch |
| Pin 2 | GND — Ground reference |
| Pin 3 | EN — Active-high enable input |
| Pin 4 | ILIM — Current-limit programming resistor to GND |
| Pin 5 | OUT — Switched output to USB VBUS |
| Pin 6 | D+/D- — Data line handshake for BC1.2 / QC3.0 / divider mode |
Typical Applications
MP5032 is suitable for 6 applications: USB Wall Chargers and Travel Adapters, Automotive USB Power Ports, USB Hub Downstream Ports, Quick Charge 3.0 Power Banks, 5V Router and IoT Gateway USB Service Ports, Docking Station USB Charging Outputs.
USB Wall Chargers and Travel Adapters
The MP5032's integrated Quick Charge 3.0 + BC1.2 + divider-mode + 1.2V/1.2V handshake makes it ideally suited to single- and multi-port USB wall chargers that must serve both legacy 5V phones and modern QC3.0 handsets. The 3A continuous output current covers 5V/3A charging, while the hiccup current-limit protects upstream adapters from short-cable faults. Placed between the rectifier/regulator output and the USB VBUS pin, it replaces a discrete load switch plus external USB-IF detection chip. The line-drop compensation maintains accurate voltage at the device end of long captive cables, which is essential for QC3.0 voltage negotiation above 5V. Component count is roughly 4-6 external parts versus 12+ for a discrete implementation.
Recommended
Automotive USB Power Ports
The MP5032's wide input tolerance, integrated input OVP, and thermal shutdown suit 12V automotive USB charging ports when paired with an upstream buck regulator. The active-high EN pin allows the body-control module to wake or sleep the USB port independently from the infotainment power state. The programmable hiccup current limit prevents nuisance tripping during engine cranking transients, while line-drop compensation keeps the negotiated QC3.0 voltage within spec at the device under charge. Note that the standard MP5032 is industrial-grade; AEC-Q100-qualified automotive USB port controllers exist in MPS's broader automotive portfolio if full automotive certification is required.
Recommended
USB Hub Downstream Ports
Multi-port USB hubs benefit from the MP5032's per-port current-limit and OVP isolation, which prevents one faulty downstream device from bringing down the entire hub. Each port can be independently enabled via the EN pin and independently current-limited via a per-port ILIM resistor. The TSOT-23-6 (GJ) footprint keeps the per-port solution under 10 mm² on a 4-layer hub PCB. Integrated QC3.0 negotiation on D+/D- allows the hub to advertise fast-charging to attached phones and tablets without external MCU intervention, keeping hub BOM cost low.
Recommended
Quick Charge 3.0 Power Banks
Portable power banks that must output 3.6V-12V adaptive voltages for QC3.0 handsets rely on the MP5032 to handle the D+/D- handshake and current-limit switching between the battery, boost regulator, and the USB port. The 3A continuous rating suits 5V/3A fast-charge output, while line-drop compensation maintains accurate device-side voltage despite USB cable losses. The hiccup current-limit prevents pack damage from a shorted or damaged cable, and OVP clamps voltage transients when the battery is hot-plugged mid-charge. The 6-pin TSOT-23-6 footprint fits comfortably alongside the boost regulator and fuel-gauge IC in compact power-bank PCBs.
Recommended
5V Router and IoT Gateway USB Service Ports
Service/maintenance USB ports on 5V router or IoT-gateway boards benefit from the MP5032's OVP and current-limit protection when technicians hot-plug debug cables or unsupported loads. The active-high EN pin allows the host SoC to power-cycle the port for device reset, and the hiccup current-limit auto-recovers after a fault without operator intervention. While the QC3.0 handshake is rarely used on such service ports, the same MP5032 simplifies the design by combining 3 features (load switch + OVP + protocol ID) in a 6-pin package, reducing BOM and PCB area versus a discrete implementation.
Recommended
Docking Station USB Charging Outputs
Laptop docking stations with downstream USB charging ports use the MP5032 to provide negotiated QC3.0 charging to attached phones and tablets while still passing USB data to the host laptop. The hiccup current-limit protects the dock's internal 5V/12V rail from port-level faults, and line-drop compensation ensures correct voltage at the device end of long docking-station cables. Per-port EN control lets the docking controller power-down unused ports to meet standby power regulations. The TSOT-23-6 (GJ) footprint simplifies dock-side PCB routing of D+/D- lines alongside the USB 2.0 data switches.
Recommended
Recommended Products Summary
Engineering reference data for MP5032 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MP5031 | MP5032GJ | MP5032GJ-P | MP5030 |
|---|---|---|---|---|---|
| Package | TSOT-23-6 (GJ) | TSOT-23-6 (GJ) | TSOT-23-6 (GJ) | TSOT-23-6 (GJ) | TSOT-23-6 (GJ) |
| Brand | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems |
| Quick Charge 3.0 Support | Yes | No (BC1.2/DCP only) | Yes | Yes | No |
Key Differentiators
- Integrated Quick Charge 3.0 handshake (vs MP5031)
- Single-IC BOM versus discrete load switch + USB-IF detector (vs Discrete P-MOSFET + external USB-IF detector IC)
- Hiccup current-limit with auto-recovery (vs Latch-off load switches (e.g., some TI TPS2 family))
Design Notes
Place input bypass (1uF X7R minimum, 10uF recommended for QC3.0 hot-plug) immediately adjacent to the IN pin and GND. The OUT pin requires a 1uF-10uF ceramic capacitor to stabilize the USB VBUS rail and absorb hot-plug inrush. Selection of the ILIM resistor determines the trip threshold: use the MPS ILIM-vs-RILIM curves in the datasheet to set the desired current limit, keeping headroom above the maximum steady-state load to avoid nuisance hiccup events during transient loads.
Estimated: at 3A continuous load and 5V IN, with VBUS at 5V, internal MOSFET dissipation is roughly (V_IN - V_OUT) * I_LOAD. At VIN=5V/VOUT=5V the dissipation is small (just I^2*RDS(ON)), but if VIN is elevated for dropout headroom the dissipation rises; verify the TSOT-23-6 thermal pad sees at least 50 mm^2 of 2-oz copper on top layer. Above 1W sustained dissipation, add thermal vias to inner layers to keep junction temperature within the MPS-recommended operating range.
Route the D+ and D- handshake lines as a 90-ohm differential pair on the OUT (device) side of the MP5032 only when the design uses USB 2.0 data; for charging-only ports, the lines can be routed as single-ended with appropriate pull-ups/pull-downs as defined by BC1.2 / divider mode. Place the ILIM resistor close to the ILIM pin with a clean GND return. Avoid running digital switching signals (DC-DC SW node) directly under the MP5032 footprint to prevent injected noise on the current-sense amplifier.
Do not exceed the input voltage absolute maximum (verify against the latest MPS datasheet). Do not omit the input capacitor - the MP5032 requires local bulk capacitance for hiccup auto-recovery to function correctly. Verify QC3.0 conformance with the latest Qualcomm compliance checklist; non-compliant handshake timing can cause attached devices to fall back to 5V only.
Compliance Information
RoHS compliant and lead-free per MPS product page. Standard MP5032 is industrial-grade (not AEC-Q100); see MPS automotive-grade USB port controllers for AEC-Q100 designs.
