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Monolithic Power Systems Inc. MP5403GQBU-Z
- Part No.:
- MP5403GQBU-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-UFQFN
- Datasheet:
-
MP5403GQBU-Z.pdf
- Description:
- IC REG BUCK ADJ/0.6V DL 20UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,162
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Product details
Overview
MP5403GQBU-Z from Monolithic Power Systems is a configurable mini PMIC integrating two high-efficiency buck regulators (3.5A and 2.5A), one 3A load switch with 20mΩ RDS(ON), input power supervisory circuitry, and full sequencing control. It operates from 2.7V–6V input, delivers fixed or adjustable outputs via package trim, and targets compact solid-state drive power rails requiring fast transient response and low quiescent current (85µA total).
For engineers reviewing the MP5403GQBU-Z datasheet, MP5403GQBU-Z pinout, MP5403GQBU-Z application, or MP5403GQBU-Z equivalent, key selection criteria include interleaved 1.5MHz operation, independent enable/power-good signals per rail, PFL threshold adjustability, thermal shutdown at 160°C, and UTQFN-20 (2.5mm×3mm) package constraints for high-density SSD layouts.
Technical Context
The MP5403 employs peak-current-mode control with 180° interleaving between its two buck channels to minimize input ripple and improve dynamic load response. Each regulator supports 100% duty cycle operation via FB pin grounding and includes internal soft-start (0.35ms), output discharge (13Ω), and latch-off short-circuit protection.
The integrated 3A load switch features programmable soft-start, over-current protection (5.6A limit), and open-drain PG3 that asserts high only when VIN3 > UVLO and VOUT3 < VIN3 – 200mV. The PFL circuit uses an external resistor divider on PFL_ADJ and CDELAY capacitor to set failure detection threshold (600mV typical) and delay (adjustable via 3.1µA internal current source).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.7V–6V for VIN1; 2.0V–6V for VIN2 (if VIN1 > UVLO); 0.6V–6V for VIN3 (if VIN1 > UVLO) - enables flexible multi-rail sourcing in SSDs. |
| Buck output currents | 3.5A (Ch1, RDS(ON) = 55mΩ/20mΩ) and 2.5A (Ch2, RDS(ON) = 65mΩ/22mΩ) - supports ASIC/SOC core and I/O rail separation. |
| Switching frequency | 1.5MHz typical (1.2–1.8MHz range) with 180° phase shift - reduces input capacitance requirement and EMI filtering burden. |
| Quiescent current | 85µA total for both bucks - extends battery life in portable storage devices during light-load standby. |
| Load switch RDS(ON) | 20mΩ - limits conduction loss to <18mW at 3A, critical for thermally constrained M.2 modules. |
| Power good accuracy | ±10% lower / +30% upper trip relative to 600mV FB reference - ensures reliable rail monitoring without external comparators. |
| Thermal shutdown | 160°C with 30°C hysteresis - provides robust protection during sustained high-current operation in sealed enclosures. |
Pinout & Package
MP5403GQBU-Z is housed in an ultra-thin UTQFN-20 package (2.5mm × 3mm, 0.5mm height) with wettable flanks, optimized for automated optical inspection and high-density PCB layouts in SSD modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CDELAY | PFL delay timing capacitor connection | Adjusts PFL low-to-high assertion delay using internal 3.1µA current source; floating = minimum delay. |
| 2 PFL_ADJ | Power failure threshold reference input | Accepts resistor-divider voltage; trips PFL when <600mV - enables custom brown-out detection on any supply rail. |
| 3 VIN1 | Main input for 3.5A buck and logic | Primary power source; enables all functions when >2.5V UVLO; powers internal LDO and gate drivers. |
| 4 AGND | Analog ground reference | Separate ground for feedback and sensing circuits to prevent noise coupling into regulation loop. |
| 5 GND | Power ground return | High-current return path for bucks and load switch; must be connected to AGND at single point near device. |
| 7 FB1 / 8 FB2 | Output voltage feedback inputs | Resistor-divider nodes for Ch1/Ch2 regulation; pulling to GND forces 100% duty cycle (bypass mode). |
| 9 EN1 / 10 EN2 / 11 EN3 | Independent enable inputs | CMOS-compatible (1.3V threshold); internal 2MΩ pull-down allows float-to-disable; enables precise power sequencing. |
| 12 SW2 / 14 SW1 | Buck switch node outputs | Connect to external inductors; require wide copper pours due to high di/dt and RMS current (up to 3.5A). |
| 15 PG1 / 16 PG2 / 17 PG3 | Open-drain power good indicators | Assert high when respective rail is in regulation (PG1/PG2) or VOUT3 < VIN3–200mV (PG3); support daisy-chained sequencing. |
| 18 VIN3 / 19 OUT3 | Load switch input and output | VIN3 supplies switch FET; OUT3 delivers regulated output; clamp function limits VOUT3 to ≤5.5V. |
| 20 PFL | Open-drain power failure indicator | Pulled low immediately when PFL_ADJ < 600mV - signals upstream supply collapse before system reset occurs. |
Key Features
| Feature | Design Value |
|---|---|
| Interleaved dual-buck architecture | 180° phase shift reduces input ripple by ~70% vs. non-interleaved, allowing smaller bulk capacitors in space-constrained SSDs. |
| Configurable output voltages | Fixed options via package trim: Ch1 (0.9V/1.1V/2.5V/2.85V), Ch2 (0.9V/1.2V/1.8V/2.5V) - eliminates external resistor networks for common SSD rail sets. |
| Integrated power supervision | PFL_ADJ + CDELAY + PFL provide fully programmable brown-out detection with adjustable delay - replaces discrete supervisor ICs. |
| Parallel mode capability | SW1/SW2 can be tied together and controlled by EN1 alone when PG1/PG2 are externally shorted - doubles current capacity to 6A for single-rail applications. |
| Low-RDS(ON) load switch | 20mΩ RDS(ON) at 3A yields <180mV dropout - maintains tight output regulation under full load without external FETs. |
Applications
| Solid-State Drives | Hybrid Drive Controllers |
|---|---|
|
Use Scenario: Powering NAND flash controller, DRAM cache, and PCIe interface in M.2 NVMe SSDs. IC Role / Device Role / Timing Role: Dual-buck regulator supplies 1.1V core and 1.8V I/O rails; load switch isolates auxiliary circuitry during sleep states. Use Value: 85µA quiescent current extends deep-sleep battery life; 1.5MHz switching enables use of 0.47µH inductors, saving board area. |
Use Scenario: Managing power sequencing for SATA-based hybrid drives combining NAND and spinning disk. IC Role / Device Role / Timing Role: EN1/EN2/EN3 and PG1/PG2/PG3 coordinate startup/shutdown order between flash buffer, motor driver, and host interface. Use Value: Independent power-good signals eliminate need for external sequencers; PFL monitors 5V rail integrity before spin-up. |
| Portable Storage Enclosures | Embedded Industrial Data Loggers |
|
Use Scenario: Single-chip power solution for USB-C powered external SSD enclosures with thermal throttling. IC Role / Device Role / Timing Role: Load switch (VIN3→OUT3) enables/disables 3.3V peripheral rail; thermal shutdown protects enclosure plastic housing. Use Value: 20mΩ RDS(ON) minimizes self-heating; UTQFN-20 footprint fits narrow 22mm-wide M.2 carrier boards. |
Use Scenario: Reliable multi-rail power in fanless industrial loggers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual bucks supply microcontroller (1.2V) and sensor interface (2.5V); PFL monitors backup battery voltage. Use Value: Guaranteed operation to +125°C junction temperature ensures longevity; RoHS/lead-free compliance meets industrial certifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP5479 | Successor device with enhanced efficiency (94% typ. at 3.5A), lower IQ (45µA), and extended VIN range (2.4V–6.5V). | Supports wider input sources including single-cell Li-ion (2.7V min) and higher-voltage industrial rails. | Preferred for new designs requiring longer battery runtime or broader input flexibility. |
| MP5417 | Pin-compatible upgrade with improved thermal performance (θJA = 52°C/W), integrated spread-spectrum modulation, and tighter FB tolerance (±0.5%). | Reduces EMI in dense layouts and improves output voltage accuracy for sensitive ADC references. | Recommended where EMI compliance or precision analog supply stability is critical. |
Compared with MP5403GQBU-Z, MP5479 offers superior light-load efficiency and input range for battery-powered systems, while MP5417 delivers better thermal management and EMI control for industrial environments - both eliminate the "Not Recommended for New Designs" status and extend product lifecycle support.
Availability
MP5403GQBU-Z is available at Aetrix Electronics and suitable for solid-state drives, hybrid drive controllers, and portable storage enclosures requiring stable component supply amid ongoing obsolescence transitions.
Supply support for MP5403GQBU-Z 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, and global manufacturing partnerships.
The MP5403 belongs to MPS's Mini PMIC family, engineered specifically for space-constrained storage and portable computing applications where integration, thermal efficiency, and sequencing precision are critical.
FAQ
What does "NOT RECOMMENDED FOR NEW DESIGNS" mean for MP5403GQBU-Z?
This designation indicates MPS has discontinued active development and long-term supply commitment for MP5403GQBU-Z. While currently available, it is superseded by MP5479 and MP5417, which offer improved specs, extended support, and guaranteed production lifecycles. Design-in should prioritize the newer alternatives unless legacy compatibility is mandatory.
Can MP5403GQBU-Z operate with only one buck enabled?
Yes. EN1 and EN2 are independently controlled with internal 2MΩ pull-down resistors. Disabling either channel (by grounding or floating its EN pin) halts switching, disables its PG output, and reduces total quiescent current. The enabled channel continues full regulation with no performance degradation.
How is the PFL delay time calculated for MP5403GQBU-Z?
PFL delay is set by capacitor CDELAY using the formula TDELAY = 0.62 × CDELAY / IDELAY + 3.5µs, where IDELAY is the internal 3.1µA current source. For example, a 100pF capacitor yields ~3.53µs delay; a 1nF capacitor yields ~35.3µs. CDELAY must be placed close to the pin with low-ESR ceramic dielectric.
Does MP5403GQBU-Z support forced PWM mode?
No. MP5403GQBU-Z uses pulse-skipping mode at light loads to maintain high efficiency. It does not offer a forced PWM option. The proprietary light-load scheme disables the low-side FET upon zero-current detection, reducing switching losses without external mode-select pins.
What is the maximum allowable output capacitance for MP5403GQBU-Z's buck regulators?
No hard upper limit is specified, but stability depends on ESR and ESL of the output capacitor. MPS recommends 22µF–100µF ceramic capacitors with ≤5mΩ ESR per channel. Excessive capacitance (>220µF) may cause overshoot during soft-start or reduce phase margin if ESR is too low.
Can the load switch be used as a hot-swap controller?
Not directly. While the 3A load switch includes OCP and soft-start, it lacks dedicated fault reporting, retry logic, or current-limit foldback required for robust hot-swap operation. It functions best as a simple ON/OFF rail switch with PG3 monitoring - external circuitry is needed for true hot-swap compliance.
Is MP5403GQBU-Z RoHS and halogen-free compliant?
Yes. MP5403GQBU-Z is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU. Full material declarations and green status documentation are available on the Monolithic Power Systems website under Quality Assurance.
MP5403GQBU-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3.5A, 2.5A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-UTQFN (2.5x3)
MP5403GQBU-Z FAQ
1.How can I place an order for MP5403GQBU-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP5403GQBU-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP5403GQBU-Z reliable?
The price and inventory of MP5403GQBU-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP5403GQBU-Z is usually 5 days.
3.What payment methods are accepted for MP5403GQBU-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP5403GQBU-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP5403GQBU-Z?
MP5403GQBU-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP5403GQBU-Z order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP5403GQBU-Z?
For technical support, including MP5403GQBU-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP5403GQBU-Z requirements.
6.How does Aetrix verify that MP5403GQBU-Z is sourced from the original manufacturer or authorized distributors?
All MP5403GQBU-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP5403GQBU-Z meets industry standards.
7.What is the process for return or replacement of MP5403GQBU-Z?
All MP5403GQBU-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP5403GQBU-Z, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP5403GQBU-Z part is unused and in its original packaging.
Return procedure for MP5403GQBU-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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