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Monolithic Power Systems Inc. MP2155GQ-Z
- Part No.:
- MP2155GQ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP2155GQ-Z.pdf
- Description:
- IC REG BUCK BOOST ADJ/1.5V 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,238
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Product details
Overview
MP2155GQ-Z from Monolithic Power Systems is a high-efficiency, single-inductor buck-boost DC/DC converter with integrated 2.2A N-channel and P-channel MOSFETs, operating from 2V to 5.5V input to deliver adjustable 1.5V–5V output. It supports battery-powered systems where input voltage crosses output (e.g., one-cell Li-ion), delivers up to 1A at 3.3V from 2.7–5.5V input, and features 1MHz fixed-frequency PWM control with pulse-skipping mode for ultra-low quiescent current (80μA).
For engineers reviewing the MP2155GQ-Z datasheet, MP2155GQ-Z pinout, MP2155GQ-Z application, or MP2155GQ-Z equivalent, this device is selected for compact, high-efficiency power conversion in space-constrained portable electronics requiring seamless buck/boost transition, load disconnect during shutdown, and internal soft-start with thermal/overcurrent protection.
Technical Context
The MP2155 employs peak current-mode control with dual-loop architecture: error amplifier output VC-Buck and level-shifted VC-Boost drive buck and boost phases respectively, enabling smooth mode transitions across Vin ≈ Vout. Its internal slope compensation ensures stability without external compensation components.
It integrates two independent current limits-primary (2.2A typ.) for steady-state PWM operation and secondary (~1.8A) for startup inrush limiting-and uses hiccup-mode short-circuit protection triggered when VOUT drops below 60% of regulation, with automatic soft-restart recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 5.5V - supports full operation across one-cell Li-ion (2.7–4.2V) and multi-cell alkaline (2–5.5V) battery discharge curves. |
| Output Voltage Range | 1.5V to 5V - set via external resistor divider on FB pin; enables direct replacement of LDOs or fixed-output converters in variable-load systems. |
| Switching Frequency | 1MHz (fixed) - minimizes external passive size (e.g., 3.3µH inductor, 2×22µF ceramic output caps) while maintaining >90% efficiency at 1A load. |
| Peak Switch Current | 2.2A - integrated low-RDS(ON) NMOS (105mΩ) and PMOS (120mΩ) switches enable 1A continuous output at 3.3V with minimal conduction loss. |
| Quiescent Current | 80μA - enables >200-hour standby in battery-powered devices using pulse-skipping mode under light load. |
| Feedback Reference | 496mV (typ.) - precise internal reference allows ±1.5% output accuracy with standard 1% resistors in feedback network. |
| Thermal Shutdown | 160°C (typ.) - protects die during overload or poor PCB thermal design; 20°C hysteresis ensures reliable recovery without oscillation. |
Pinout & Package
MP2155GQ-Z is housed in a thermally enhanced 3mm × 3mm QFN-10 package with exposed thermal pad (EP), optimized for high-power density and low thermal resistance (θJA = 50°C/W on 4-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output node | Delivers final buck-boost output; connects directly to load and output capacitor bank; requires low-ESR ceramic caps placed adjacent to pin. |
| SW2 / SW1 | Switch node terminals | Connect opposite ends of single inductor; SW1 and SW2 alternate conduction to implement 4-switch buck-boost topology; high di/dt nodes require tight loop layout. |
| PGND | Power ground return | Primary return path for high-current switch paths; must be connected directly to EP thermal pad and input/output capacitors' ground planes. |
| VIN | Main power stage input | Supplies energy to switching transistors; requires ≥10µF low-ESR ceramic cap placed within 2mm of pin to suppress input ripple and EMI. |
| EN | Enable control input | Active-high logic control; pulls device into full shutdown (<1μA IQ) when low; must not float - tie to VIN via ≥100kΩ resistor for auto-start. |
| MODE/SYNC | Operation mode selection | Logic-controlled pin: low = automatic PSM/PWM transition; high = forced fixed-frequency PWM; also accepts external clock (1–2MHz) for synchronization. |
| VCC | Control circuit supply | Bias rail for internal logic and gate drivers; powered from VIN internally but requires local 1µF bypass cap due to noise sensitivity. |
| AGND | Analog ground reference | Signal ground for FB, error amp, and reference; must be routed separately from PGND and joined only at single point near EP pad. |
| FB | Output voltage feedback | Senses regulated output via resistor divider; high-impedance input (50nA bias); trace must avoid SW nodes and be shielded from noise sources. |
| EP | Thermal pad | Exposed copper pad beneath die; must be soldered to solid PGND plane for thermal dissipation and EMI reduction; contributes to θJC = 12°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck + boost ICs or complex transformer-based solutions - reduces BOM count by ≥30% and board area by >40% vs. dual-converter approach. |
| Internal loop compensation | Enables stable operation with no external compensation components - simplifies design validation and eliminates tuning iterations for common output capacitor ESR ranges. |
| Load disconnect during shutdown | Isolates output from input when EN = low - prevents battery drain through load or feedback network, critical for always-on IoT sensors and medical wearables. |
| Hiccup-mode short-circuit protection | Shuts down SWA/SWC and activates BD mode (SWB/SWD on) for safe current limiting; automatically recovers after thermal cooldown and soft-start - avoids latch-up failure in field-deployed units. |
| 1MHz fixed-frequency + PSM option | Ensures predictable EMI profile for EMC-compliant designs while enabling dynamic efficiency optimization - achieves 95% peak efficiency in PWM and >85% at 1mA load in PSM. |
Applications
| Portable Medical Sensors | Handheld POS Terminals |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by single CR2032 coin cell (2.0–3.0V) regulating 3.3V for BLE SoC and sensor interface. IC Role / Device Role / Timing Role: Primary system power regulator managing input voltage crossing output during battery discharge; provides load disconnect to prevent deep discharge. Use Value: Enables >12-month shelf life with 80μA quiescent current and extends runtime by 35% vs. linear regulators due to >92% efficiency at 5mA load. |
Use Scenario: Battery-backed retail terminal using 2xAA alkaline (2.4–3.2V) powering 3.3V display controller and 5V thermal printer interface. IC Role / Device Role / Timing Role: Dual-rail power source delivering stable 3.3V and 5V outputs from shared input; MODE pin forced high for EMI-controlled fixed-frequency operation near RF modules. Use Value: Eliminates need for separate boost converter for 5V rail - reduces solution size by 28mm² and component count by 7 parts versus discrete buck+boost implementation. |
| Industrial Handheld Scanners | GSM/GPRS Modem Modules |
|
Use Scenario: Rugged barcode scanner with Li-ion battery (3.0–4.2V) powering 3.3V image sensor and 5V laser driver, subject to wide temperature (-20°C to +70°C). IC Role / Device Role / Timing Role: Main power management IC providing robust regulation across full battery range and temperature; thermal shutdown (160°C) prevents field failure during extended use. Use Value: Maintains 3.3V ±2% regulation over full input range and temperature, enabling consistent image capture performance without brownouts or resets. |
Use Scenario: Cellular IoT module operating from 3.6V Li-SOCl₂ primary battery (3.3–3.9V) supplying 3.3V to modem baseband and 5V to SIM interface. IC Role / Device Role / Timing Role: High-reliability buck-boost regulator supporting GSM burst current demands (up to 2A peak) while maintaining VOUT stability during RF transmission. Use Value: Delivers 1A continuous + 2A pulsed output without voltage droop - ensures reliable GPRS packet transmission even at end-of-life battery voltage (3.3V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS63020DSJR | Higher 3A switch current rating; 2.5V–5.5V input; 1.8V–5.5V output; requires external compensation. | Supports higher peak loads (e.g., motor-driven peripherals); larger solution size due to external compensation and 2.2µH inductor requirement. | Select when >1.5A continuous output or wider output adjustability (1.8–5.5V) is required; accept added design complexity for higher current headroom. |
| Analog Devices LT8330EDDB#TRMPBF | 40V max input; 2.8V–40V output; 1.2A switch; requires external MOSFETs and compensation; 2MHz switching. | Targets industrial/high-voltage battery systems (e.g., 12V lead-acid backup); not suitable for sub-5V compact portable designs. | Select only for applications needing >5.5V input tolerance or programmable frequency beyond 2MHz; avoid for space-constrained consumer devices. |
Compared with TPS63020DSJR and LT8330EDDB#TRMPBF, MP2155GQ-Z offers optimal balance of integration (no external compensation), ultra-low IQ (80μA), and compact 3×3mm footprint - making it the preferred choice for cost-sensitive, size-constrained portable electronics operating strictly within 2–5.5V input range.
Availability
MP2155GQ-Z is available at Aetrix Electronics and suitable for portable medical sensors, handheld POS terminals, industrial scanners, and GSM/GPRS modem modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2155GQ-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 over 20 years of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP2155 belongs to MPS's high-efficiency buck-boost converter product line, designed specifically for battery-powered portable electronics where input voltage varies across output and minimal solution footprint is critical.
FAQ
What is the maximum continuous output current capability of MP2155GQ-Z?
The MP2155GQ-Z delivers up to 1A continuous output current at 3.3V when input is 2.7–5.5V, verified under thermal conditions per datasheet Figure 6 (TA = +25°C, 4-layer PCB). At higher ambient temperatures or with reduced airflow, derating applies - e.g., ~0.75A at +60°C ambient with standard layout.
Can MP2155GQ-Z operate with input voltage equal to output voltage?
Yes - the MP2155GQ-Z is explicitly designed for buck-boost operation where VIN = VOUT. In this region, it dynamically transitions between buck and boost phases using internal level-shifted control loops (VC-Buck and VC-Boost), maintaining regulation without dropout or instability.
How does the MODE pin affect efficiency and EMI performance?
When MODE is low, the device enters pulse-skipping mode (PSM) under light load, reducing switching frequency and improving light-load efficiency (>85% at 1mA), but increasing output voltage ripple and potential EMI spread. When MODE is high, fixed 1MHz PWM ensures consistent EMI spectrum and lower ripple, ideal for noise-sensitive RF sections.
Is external compensation required for stable operation?
No - the MP2155GQ-Z includes fully internal loop compensation optimized for standard ceramic output capacitors (2×22µF, X5R/X7R). No external compensation components are needed, eliminating tuning effort and ensuring stability across recommended output capacitor ESR ranges (0.5–20mΩ).
What thermal management practices are recommended for sustained 1A operation?
For sustained 1A output, solder the EP thermal pad to ≥2cm² of inner-layer PGND copper with ≥4 thermal vias (0.3mm diameter, 0.8mm pitch). Maintain θJA ≤ 50°C/W using a 4-layer PCB per JEDEC JESD51-7; avoid covering EP pad with solder mask to maximize thermal transfer.
Does MP2155GQ-Z support output voltage synchronization to an external clock?
Yes - the MODE/SYNC pin accepts external clock signals from 1MHz to 2MHz. When driven with a clean square wave, the MP2155 synchronizes its internal oscillator to the external frequency, enabling EMI reduction through clock dithering or alignment with system timing domains.
What protection features are integrated into MP2155GQ-Z?
The MP2155GQ-Z integrates over-temperature protection (160°C trip, 140°C release), hiccup-mode short-circuit protection (SCP), overcurrent protection (OCP) with dual current limits (2.2A primary, ~1.8A secondary), undervoltage lockout (UVLO: 1.8V rising, 1.6V falling), and internal soft-start (2ms typical) to prevent inrush and overshoot.
MP2155GQ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V (3.3V)
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1A, 2.2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP2155GQ-Z FAQ
1.How can I place an order for MP2155GQ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2155GQ-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 MP2155GQ-Z reliable?
The price and inventory of MP2155GQ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2155GQ-Z is usually 5 days.
3.What payment methods are accepted for MP2155GQ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2155GQ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2155GQ-Z?
MP2155GQ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2155GQ-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 MP2155GQ-Z?
For technical support, including MP2155GQ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2155GQ-Z requirements.
6.How does Aetrix verify that MP2155GQ-Z is sourced from the original manufacturer or authorized distributors?
All MP2155GQ-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 MP2155GQ-Z meets industry standards.
7.What is the process for return or replacement of MP2155GQ-Z?
All MP2155GQ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2155GQ-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 MP2155GQ-Z part is unused and in its original packaging.
Return procedure for MP2155GQ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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