My Inquiry
My Account
Monolithic Power Systems Inc. MP2128DG-LF-Z
- Part No.:
- MP2128DG-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-TFDFN Exposed Pad
- Datasheet:
-
MP2128DG-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,103
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP2128DG-LF-Z from Monolithic Power Systems is a 3MHz, current-mode, synchronous step-down DC/DC converter with integrated high-side PFET and low-side NFET, delivering up to 1A output current from a 2.5V–6V input. It regulates output down to 0.6V, features <1µA shutdown current, internal soft-start, and cycle-by-cycle overcurrent protection. It powers Li-ion/Li-polymer–based portable devices such as smartphones and media players.
For engineers reviewing the MP2128DG-LF-Z datasheet, MP2128DG-LF-Z pinout, MP2128DG-LF-Z application, or MP2128DG-LF-Z equivalent, key selection criteria include its 3MHz fixed-frequency operation, 0.6V feedback reference, thermal shutdown at 150°C, QFN8 (2mm×2mm) package, and 1.5A peak switch current limit - all critical for compact, high-efficiency battery-powered power rails.
Technical Context
The MP2128DG-LF-Z implements slope-compensated peak current-mode PWM control with a fixed 3MHz oscillator, enabling stable regulation and fast transient response in space-constrained designs. Its 100% duty-cycle capability supports dropout operation near VOUT, while integrated synchronous rectification eliminates external Schottky losses.
It uses a 0.6V precision feedback reference with ±2% tolerance over –40°C to +85°C, and includes dedicated EN pin logic (1.6V turn-on, 0.4V turn-off), short-circuit foldback (reduced switching frequency and current limit), and thermal shutdown with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports single-cell Li-ion (2.7–4.2V) and Li-polymer batteries with headroom for voltage spikes. |
| Output Voltage Range | 0.6V to 6V - adjustable via external resistor divider; 0.6V FB reference enables low-voltage core supplies (e.g., 1.2V, 1.0V, 0.9V). |
| Switching Frequency | 3MHz (typical) - allows use of sub-2.2µH inductors and small ceramic output capacitors for ultra-compact PCB layouts. |
| Max Output Current | 1A continuous - sustained under thermal limits in QFN8 package (θJA = 50°C/W on 4-layer board). |
| Feedback Reference | 0.594V (typical), ±2% over temperature - ensures tight output regulation across load and ambient conditions. |
| Shutdown Current | <1µA - preserves battery life during system sleep modes in portable electronics. |
| Thermal Shutdown | 150°C (with 20°C hysteresis) - protects die during overload or poor heatsinking; auto-recovery after cooldown. |
Pinout & Package
The MP2128DG-LF-Z is housed in an RoHS-compliant, thermally enhanced 8-pin QFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by a dot or beveled corner per JEDEC MO-229 VCCD-3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Connects to center tap of external R1/R2 divider; regulates output by comparing against 0.6V internal reference. |
| 2,4 (AGND/PGND) | Analog & Power Ground | Separate AGND (pin 2) and PGND (pin 4) minimize noise coupling; both must connect to low-impedance ground plane. |
| 3 (IN) | Power Input | Primary VIN supply; requires ≥4.7µF ceramic bypass capacitor placed adjacent to pin. |
| 5,6 (SW) | Switch Node | Drain connection of internal PFET/NFET; drives external inductor; high dv/dt node requiring tight layout. |
| 7 (EN) | Enable Control | Logic-level input: >1.6V enables regulator; <0.4V disables with <1µA quiescent draw. |
| 8 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND per layout guidelines - not used for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated NFET replaces Schottky diode, eliminating conduction loss and boosting efficiency up to 95% at mid-load. |
| 100% Duty-Cycle Operation | Enables dropout mode when VIN ≈ VOUT, maintaining regulation down to VIN = VOUT + ILOAD × (RDS(on)_PFET + RINDUCTOR). |
| Cycle-by-Cycle Current Limit | 1.5A peak switch current limit prevents MOSFET overstress during startup, overload, or short-circuit events. |
| Internal Soft-Start | 100µs controlled ramp-up of FB reference avoids output overshoot and inrush current into bulk capacitance. |
| Short-Circuit Foldback | Reduces switching frequency and lowers current limit during output short, limiting power dissipation and thermal rise. |
Applications
| Smartphone Core Supply | DSP/Microprocessor I/O Rail |
|---|---|
Use Scenario: Powers ARM Cortex-A series application processors in dual-SIM 4G smartphones requiring dynamic voltage scaling between 0.8V and 1.2V. IC Role / Device Role / Timing Role: Primary buck regulator generating CPU I/O voltage from single-cell Li-Po battery (3.0–4.2V). Use Value: 3MHz switching enables <1.5µH inductor and 22µF total output capacitance, reducing solution footprint by >40% vs. 1MHz alternatives. | Use Scenario: Supplies configurable I/O banks of automotive-grade microcontrollers in telematics control units. IC Role / Device Role / Timing Role: Secondary buck stage regulating 1.8V or 2.5V I/O rail from main 5V system bus. Use Value: 0.6V feedback reference and ±2% accuracy ensure stable interface signaling across –40°C to +85°C without calibration. |
| Portable Media Player Audio Codec | Digital Camera Image Sensor Bias |
Use Scenario: Delivers clean 1.2V analog supply to high-resolution audio DAC/ADC in Bluetooth-enabled MP3 players. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck converter operating in forced PWM mode to avoid AM band interference. Use Value: Internal soft-start and <1µA shutdown current extend playback time by minimizing quiescent loss during pause states. | Use Scenario: Provides regulated 2.8V bias to CMOS image sensor in compact 4K video cameras. IC Role / Device Role / Timing Role: Compact, thermally robust point-of-load regulator mounted adjacent to sensor module. Use Value: QFN8 (2mm×2mm) package with exposed thermal pad sustains 1A load at +70°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 2.25MHz switching, 0.6V FB, 1A rating, but only 2.05–6.5V input range; no 100% duty-cycle mode. | Lacks dropout support below 2.05V - unsuitable for deep-discharge Li-ion (<2.5V) operation. | Prefer MP2128DG-LF-Z where input may dip to 2.5V or lower during battery aging. |
| Analog Devices ADP2301ARMZ-R7 | Fixed 1.2V or adjustable (0.8V min) output; 1.2MHz switching; 0.8A max; thermal shutdown at 150°C. | Lower max current and frequency limit output capacitor size reduction and transient response speed. | Choose MP2128DG-LF-Z for 1A loads requiring <100ns load-step recovery in portable systems. |
Compared with TPS62231DRYR and ADP2301ARMZ-R7, the MP2128DG-LF-Z uniquely combines 3MHz operation, 2.5V minimum input, 100% duty cycle, and QFN8 thermal performance - making it optimal for next-gen compact battery-powered devices demanding high efficiency at light-to-full load.
Availability
MP2128DG-LF-Z is available at Aetrix Electronics and suitable for smartphone power management, portable media player subsystems, and digital camera image sensor biasing requiring stable component supply across production lifecycles.
Supply support for MP2128DG-LF-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, headquartered in Kirkland, WA, with global design and support operations.
The MP2128 belongs to MPS's high-frequency synchronous buck converter product line, engineered specifically for space- and efficiency-critical portable electronics powered by single-cell lithium batteries.
FAQ
What is the recommended input capacitor for MP2128DG-LF-Z?
A minimum 4.7µF X5R/X7R ceramic capacitor rated ≥6.3V must be placed as close as possible to the IN and PGND pins. For optimal EMI and transient response, pair it with a 0.1µF high-frequency ceramic capacitor in parallel. Total effective capacitance should exceed 6µF with low ESL construction.
Does MP2128DG-LF-Z require an external compensation network?
No - the MP2128DG-LF-Z uses internal Type-II compensation optimized for standard 1.0–2.2µH inductors and 10–22µF ceramic output capacitors. External compensation components are unnecessary unless using non-standard LC values or demanding ultra-fast transient response beyond datasheet specifications.
Can MP2128DG-LF-Z operate with a 2.4V input?
No - the absolute minimum input voltage is 2.5V per Absolute Maximum Ratings. At 2.4V, the UVLO circuit (rising threshold 1.8–2.3V) will prevent startup, and internal bias circuitry cannot sustain regulation. Design margin requires VIN ≥2.55V across temperature and tolerance.
How is thermal performance affected by the exposed pad connection?
The QFN8's exposed thermal pad must be soldered to a minimum 25mm² copper area with ≥4 thermal vias (0.3mm diameter) to inner/ground planes. Without this, θJA degrades from 50°C/W to >85°C/W, risking thermal shutdown at ≤600mA load in still air.
Is the NC pin (Pin 8) safe to tie to ground?
Yes - Pin 8 is a true no-connect with no internal bond wire. Per MPS layout guidelines, it may be left floating or connected to PGND to improve mechanical stability and thermal conduction. Do not route signals or apply voltage to this pin.
What happens during output short-circuit condition?
Upon short, the MP2128DG-LF-Z reduces switching frequency and lowers peak current limit to ~0.5A, limiting power dissipation. Output voltage collapses, but device remains functional and automatically recovers once short is removed and FB voltage rises above 0.6V.
Does MP2128DG-LF-Z support forced PWM mode?
No - it operates exclusively in PWM mode under all load conditions; there is no power-save or PFM mode. This ensures constant 3MHz switching for predictable EMI filtering and minimal output voltage ripple across 1mA–1A loads.
MP2128DG-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 1A
- Frequency - Switching:
- 2.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x2)
MP2128DG-LF-Z FAQ
1.How can I place an order for MP2128DG-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2128DG-LF-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 MP2128DG-LF-Z reliable?
The price and inventory of MP2128DG-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2128DG-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2128DG-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2128DG-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2128DG-LF-Z?
MP2128DG-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2128DG-LF-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 MP2128DG-LF-Z?
For technical support, including MP2128DG-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2128DG-LF-Z requirements.
6.How does Aetrix verify that MP2128DG-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2128DG-LF-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 MP2128DG-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2128DG-LF-Z?
All MP2128DG-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2128DG-LF-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 MP2128DG-LF-Z part is unused and in its original packaging.
Return procedure for MP2128DG-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP2128DG-LF-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
