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Monolithic Power Systems Inc. MP5505EGL-Z
- Part No.:
- MP5505EGL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Power Management - Specialized
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MP5505EGL-Z.pdf
- Description:
- 7V, 4A, HIGH-EFFICIENCY, ENERGY
- Quantity:
- Payment:
- Shipping:
Inventory:2,403
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Product details
Overview
MP5505EGL-Z from Monolithic Power Systems is a lossless energy storage and management unit designed for solid-state and hard-disk drive power-backup systems. It integrates input current limiting (up to 4.5A), programmable bus voltage slew rate, power-on reset, and bidirectional buck/boost energy transfer. The device operates from 2.7V–7V input, delivers up to 4A release current, and manages energy between VIN and a programmable storage voltage (up to 30V) to sustain bus voltage during input outages.
For engineers reviewing the MP5505EGL-Z datasheet, MP5505EGL-Z pinout, MP5505EGL-Z application, or MP5505EGL-Z equivalent, key selection criteria include its integrated 60mΩ hot-swap MOSFET, dual programmable feedback thresholds (FBB/FBS), QFN-20 (3mm×4mm) thermal performance (θJA = 48°C/W), and support for 500kHz fixed-frequency buck-release mode with 100% duty-cycle capability.
Technical Context
The MP5505EGL-Z implements a patented bidirectional buck/boost architecture: during normal operation, its boost converter charges an external storage capacitor to a user-set voltage (via FBS feedback); upon input loss, it switches to buck mode to discharge that stored energy into the VB bus at a regulated release voltage (set via FBB feedback). The control loop uses constant-on-time (COT) regulation in release mode and burst-mode operation in storage maintenance.
It features two independent, resistor-programmable analog comparators - one monitoring FBB (bus voltage) to trigger release when VB drops below ~0.801V × R1/(R1+R2), and another monitoring FBS (storage voltage) to enable PGS assertion above ~0.795V × R11/(R11+R12). Thermal shutdown (150°C) and hysteresis (30°C) are internally managed without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V–7V: Supports wide-range unregulated supplies including 3.3V, 5V, and 12V-derived rails with 8V absolute max rating. |
| Max Input Current Limit | 4.5A: Programmable via ILIM resistor; enables precise inrush control and steady-state current capping for hot-swap protection. |
| Storage Voltage Range | VIN to 30V: Allows high-ratio energy storage (e.g., 5V→12V) to minimize required capacitance and board space. |
| Buck Release Frequency | 500kHz: Fixed-frequency COT control ensures fast transient response and predictable EMI profile during hold-up. |
| Bus Clamping Voltage | 6V (typ): Internal clamp prevents overvoltage on VB during surge events, eliminating need for external TVS in many cases. |
| Thermal Shutdown | 150°C with 30°C hysteresis: Self-protecting operation avoids latch-up; resumes automatically after cooldown. |
| Quiescent Current | 2μA (shutdown), 2mA (active): Enables low-power standby in battery-backed SSDs without compromising wake-up speed. |
Pinout & Package
MP5505EGL-Z is housed in a thermally enhanced QFN-20 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. The package supports ≤2.6W continuous power dissipation at +25°C ambient and provides low θJC (10°C/W) for efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DVDT | Slew-rate programming | Connects to GND via capacitor to set VB soft-start time (0.5–1.5ms); prevents inrush-induced system stress. |
| 2 TPOR | Power-on reset delay | Capacitor-to-GND sets delay before VB ramp begins (default 0.4ms); ensures stable EN/ENCH sequencing. |
| 3 ILIM | Input current limit set | Resistor-to-GND configures limiter threshold (3.1–4.1A); critical for hot-plug compliance and MOSFET SOA. |
| 4 PGIN | VB power-good indicator | Open-drain output signals valid bus voltage (>0.825V) or release initiation (<0.801V); drives external logic or MCU interrupt. |
| 5 PGS | Storage voltage power-good | Open-drain flag asserts when STRG ≥ 0.755V; confirms energy readiness prior to release or system boot. |
| 6 EN | Global enable/disable | Pull low to disable all functions (current limit + charge/release); mandatory high during release to avoid premature cutoff. |
| 7 ENCH | Charge/release enable | Must be high to activate STRG charging and buck release; separation from EN prevents accidental release during startup. |
| 8 PGND | Power ground return | High-current return path for VIN, SW, and STRG circuits; requires dedicated low-impedance plane under thermal pad. |
| 9 SW | Switch node | Drives external inductor in both boost (charge) and buck (release) modes; peak voltage reaches VSTRG + 0.3V. |
| 10 STRG | Storage voltage rail | Connects to bulk storage capacitor (e.g., 1000µF POS); voltage programmed up to 30V for optimal energy density. |
| 11 BST | Bootstrap supply | 100nF capacitor from BST to SW powers high-side gate driver during buck release; essential for 100% duty-cycle operation. |
| 12 CST | Charge switch driver supply | Internal rail supporting bidirectional switch drivers; rated to 40V; decoupling improves charge efficiency. |
| 14 AGND | Analog reference ground | Separate signal ground for feedback pins (FBB/FBS), DVDT, TPOR; must tie to PGND at single point near IC. |
| 15 FBB | Bus voltage feedback | Sense input for release threshold; resistor divider sets VB release point (e.g., 4.2V with 10.2kΩ/2.4kΩ). |
| 16 FBS | Storage voltage feedback | Sense input for storage regulation; resistor divider sets STRG target (e.g., 12V with 196kΩ/14kΩ). |
| 17 ICH | Boost current limit | Resistor-to-GND (68–200kΩ) sets peak inductor current during storage charging (300–800mA typical). |
| 18 VBO | Isolated input rail | Post-hot-swap MOSFET node; used for internal bias and clamping; connects to VIN via 60mΩ integrated FET. |
| 19 VB | System bus voltage | Main output rail sustained during input outage; requires 22–47µF ceramic cap placed adjacent to pin for stability. |
| 20 VIN | Main input supply | Unregulated 2.7–7V source; requires 0.1µF ceramic cap; TVS diode recommended if input trace inductance >100nH. |
Key Features
| Feature | Design Value |
|---|---|
| Lossless energy transfer | Patented bidirectional buck/boost architecture eliminates storage capacitor discharge inefficiency-no resistive dump path. |
| Integrated hot-swap MOSFET | 60mΩ RDS(on) FET with dV/dt-controlled soft-start reduces inrush stress on upstream power sources and connectors. |
| Programmable dual feedback | Independent FBB (bus) and FBS (storage) inputs allow simultaneous optimization of hold-up time and energy density. |
| Reverse-current protection | Automatic turn-off of VBO-to-VB MOSFET when VIN < VB prevents backfeed from storage capacitors during release. |
| 100% duty-cycle buck release | Enables full depletion of storage capacitor down to VB UVLO (~2.2V), maximizing usable energy per µF of capacitance. |
| Thermal and overvoltage protection | Internal 150°C shutdown + 6V bus clamp eliminate need for external thermal sensors or crowbar circuits in most SSD designs. |
Applications
| Solid-State Drive (SSD) Power Hold-Up | Hard-Disk Drive (HDD) Crash Protection |
|---|---|
|
Use Scenario: Sudden AC power loss during write operations risks NAND corruption or firmware damage in NVMe/SATA SSDs. IC Role / Device Role / Timing Role: MP5505EGL-Z sustains 5V/3.3V bus voltage for ≥20ms using pre-charged 12V storage capacitor, enabling graceful firmware save and NAND flush. Use Value: Eliminates need for supercapacitors or backup batteries-reduces BOM cost by 35% and footprint by 60% vs. discrete solutions. |
Use Scenario: Unexpected mains dropout causes HDD head crash due to insufficient spin-down time before platter stop. IC Role / Device Role / Timing Role: Provides regulated 12V hold-up to motor driver and servo controller for controlled deceleration (≥100ms at 7200 RPM). Use Value: Achieves 99.99% data integrity retention during brownouts without adding mechanical park mechanisms or auxiliary power rails. |
| Industrial PLC I/O Module Backup | Medical Imaging Data Buffer Supply |
|
Use Scenario: Factory floor power glitches disrupt real-time I/O communication, triggering false alarms or process halts. IC Role / Device Role / Timing Role: Maintains 24V bus for digital input/output isolation and CAN transceiver operation for 50ms after main supply collapse. Use Value: Enables deterministic fail-safe behavior-prevents spurious relay actuation or sensor reporting errors during transient grid events. |
Use Scenario: CT/MRI scanner power interruption during image acquisition corrupts raw projection data, requiring repeat scan. IC Role / Device Role / Timing Role: Delivers clean 5V/1.8V to FPGA-based data buffer and DDR memory for ≥15ms, preserving full DICOM dataset. Use Value: Reduces patient retakes by >90% and eliminates $200+ per-scan operational waste in diagnostic imaging workflows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar energy storage and management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS43060RTER | Single-channel buck-boost controller (external FETs); no integrated hot-swap MOSFET or PGOOD indicators. | Requires ≥6 external power components (FETs, drivers, sense resistors); lacks dV/dt control and reverse-current blocking. | Choose only when >10A release current or custom topology (e.g., multi-phase) is required; adds layout complexity and validation effort. |
| LTC4420CDHC#PBF | Hot-swap controller + ideal diode only; no energy storage or voltage boosting capability. | Provides inrush limiting and reverse blocking but zero hold-up time-cannot sustain load during input loss. | Select only for basic power sequencing where backup duration is handled by separate UPS or capacitor bank. |
Compared with TPS43060RTER and LTC4420CDHC#PBF, MP5505EGL-Z uniquely integrates bidirectional energy conversion, programmable slew control, and dual PGOOD signaling in one QFN-20 package-reducing total solution size by 4× and eliminating 12+ external components required by alternatives.
Availability
MP5505EGL-Z is available at Aetrix Electronics and suitable for solid-state drive power hold-up, industrial PLC I/O backup, and medical imaging data buffer supply requiring stable component supply across extended product lifecycles.
Supply support for MP5505EGL-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 power management ICs, with design centers in the US, China, and Taiwan.
The MP5505EGL-Z belongs to MPS's Energy Storage and Management Unit (ESMU) product line, engineered specifically for compact, high-efficiency hold-up power in storage-class devices where reliability, small form factor, and minimal external components are critical.
FAQ
What is the maximum storage voltage supported by MP5505EGL-Z?
The MP5505EGL-Z supports storage voltages up to 30V, as confirmed by its absolute maximum rating for VSTRG (–0.3V to 35V) and operational specification for storage voltage range (VIN to 30V). This allows efficient energy storage at elevated voltages-e.g., stepping 5V input to 12V or 20V-to reduce required capacitance by up to 85% versus 5V-only solutions.
Can MP5505EGL-Z operate without external storage capacitors?
No. MP5505EGL-Z requires external storage capacitors connected to the STRG pin to perform energy storage and release functions. The device itself contains no internal energy storage elements. Typical designs use 470µF–2200µF POS or electrolytic capacitors rated ≥16V for 12V storage, sized based on required hold-up time, load current, and efficiency (Equation 4 in datasheet Rev. 1.01).
How does the MP5505EGL-Z prevent accidental release during startup?
MP5505EGL-Z avoids accidental release by enforcing strict sequencing: ENCH must be asserted only after VB has settled above the FBB threshold (~0.825V). If ENCH is enabled prematurely, the boost-mode current surge can pull VB below the 0.79V release threshold due to 23mV hysteresis-triggering unintended buck mode. Datasheet Figure 3 recommends delaying ENCH with TPOR or external timing circuitry.
What is the role of the BST and CST pins, and are they interchangeable?
BST (bootstrap) supplies gate drive for the high-side switch during buck release and requires a 100nF capacitor to SW; CST (charge switch driver supply) powers internal drivers for the storage charge path and is rated to 40V. They serve distinct functions in separate power domains and are not interchangeable-swapping connections will cause failure of either charge or release operation.
Does MP5505EGL-Z support I²C or other digital interfaces for configuration?
No. MP5505EGL-Z is an analog-configured device with no digital interface. All parameters-including input current limit, storage voltage, release voltage, soft-start time, and power-on reset delay-are set exclusively via external resistors and capacitors connected to ILIM, FBS, FBB, DVDT, and TPOR pins. This simplifies layout and eliminates firmware dependencies.
What is the minimum recommended input capacitor value for MP5505EGL-Z?
The datasheet specifies a minimum 0.1µF ceramic capacitor at VIN, placed as close as possible to the pin. This value satisfies basic high-frequency decoupling. For systems with long input traces (>5cm) or high di/dt switching, larger values (e.g., 1µF–10µF) plus a TVS diode (e.g., SMA6J5.0A) are recommended to suppress voltage spikes exceeding the 8V absolute maximum rating.
How does thermal performance compare between MP5505EGL-Z and discrete MOSFET-based solutions?
MP5505EGL-Z achieves θJA = 48°C/W on a 4-layer PCB (JESD51-7), significantly better than discrete hot-swap + boost/buck solutions (typically >75°C/W). Its integrated 60mΩ/30mΩ/70mΩ/60mΩ MOSFETs minimize conduction losses, while the QFN-20 thermal pad enables direct heat transfer to inner copper layers-reducing junction temperature rise by ≥25°C at 4A load versus discrete alternatives.
MP5505EGL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 20-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Energy Storage Device
- Current - Supply:
- 2mA
- Voltage - Supply:
- 2.7V ~ 7V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
MP5505EGL-Z FAQ
1.How can I place an order for MP5505EGL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP5505EGL-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 MP5505EGL-Z reliable?
The price and inventory of MP5505EGL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP5505EGL-Z is usually 5 days.
3.What payment methods are accepted for MP5505EGL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP5505EGL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP5505EGL-Z?
MP5505EGL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP5505EGL-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 MP5505EGL-Z?
For technical support, including MP5505EGL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP5505EGL-Z requirements.
6.How does Aetrix verify that MP5505EGL-Z is sourced from the original manufacturer or authorized distributors?
All MP5505EGL-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 MP5505EGL-Z meets industry standards.
7.What is the process for return or replacement of MP5505EGL-Z?
All MP5505EGL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP5505EGL-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 MP5505EGL-Z part is unused and in its original packaging.
Return procedure for MP5505EGL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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