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Monolithic Power Systems Inc. MP2321GD-Z
- Part No.:
- MP2321GD-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFQFN
- Datasheet:
-
MP2321GD-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MP2321GD-Z from Monolithic Power Systems is a fully-integrated, synchronous step-down DC/DC converter optimized for battery-powered systems. It delivers 2A continuous output current from a 4V–19V input, achieves 40μA quiescent current, employs constant-on-time (COT) control for fast transient response, and integrates 110mΩ/40mΩ high-side/low-side MOSFETs in a QFN-14 (2mm×3mm) package - enabling compact, high-efficiency power rails in portable SSDs and tablets.
For engineers reviewing the MP2321GD-Z datasheet, MP2321GD-Z pinout, MP2321GD-Z application, or MP2321GD-Z equivalent, key selection criteria include light-load efficiency (40μA IQ), programmable soft-start, power-good signaling with 140μs delay, forced-PWM/auto-PFM mode selection via FREQ/MODE, and thermal shutdown at 150°C with 20°C hysteresis.
Technical Context
The MP2321GD-Z uses constant-on-time (COT) control architecture with internal ramp compensation, enabling stable regulation without external loop compensation components. Its dual-mode operation - selectable via FREQ/MODE pin connection to VIN (forced PWM) or GND (auto PFM/PWM) - dynamically optimizes switching frequency across load conditions while maintaining tight output regulation (±1.5% VFB accuracy).
It integrates a 5V internal LDO (VCC), bootstrap gate driver (BST), open-drain power-good (PG) with UV/OV thresholds at 0.85×/0.9× and 1.1×/1.2× VREF, and cycle-by-cycle over-current protection that transitions to hiccup mode under sustained short-circuit conditions - all coordinated through a single synchronous buck topology with integrated HS/LS MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 19V - supports wide-input industrial and battery-derived rails including 2S–5S Li-ion stacks. |
| Output Current | 2A continuous - sufficient for core logic rails in SSD controllers and tablet SoCs. |
| Quiescent Current | 40μA - enables >100-hour standby in always-on battery applications without significant drain. |
| Feedback Reference | 600mV ±1.5% - sets precise output voltage via external resistor divider; enables 0.6V–19V adjustable output. |
| RDS(ON) | 110mΩ (HS) / 40mΩ (LS) - minimizes conduction loss and improves full-load efficiency beyond 92% at 1A. |
| Switching Frequency | Programmable up to ~1.1MHz - allows use of small 2.2μH inductors and 22μF ceramic output caps for space-constrained PCBs. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during sustained overload; resumes operation only after junction cools to ≤130°C. |
Pinout & Package
MP2321GD-Z is housed in a thermally enhanced QFN-14 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports high-power density designs and requires proper PCB copper pour and vias under the pad for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12 GND | Power and signal reference ground | Primary return path for output current and internal bias; must connect to low-impedance ground plane with multiple vias. |
| 2, 13 SW | Switch node | Drives external inductor; connects to BST capacitor and requires short, wide copper trace to minimize ringing and EMI. |
| 3, 14 VIN | Main input supply | Accepts 4V–19V; requires local 10μF ceramic decoupling placed near pin to suppress high-frequency noise. |
| 4 FREQ/MODE | Frequency set and operating mode select | Pull to VIN for forced PWM; pull to GND for auto PFM/PWM; resistor value sets switching frequency and determines control behavior. |
| 5 PG | Power-good indicator | Open-drain output asserting high when VFB is within 90–110% of 600mV; includes 140μs delay and requires external 100kΩ pull-up. |
| 6 SS | Soft-start timing control | Connects to external capacitor (e.g., 4.7nF) to linearly ramp output voltage and prevent inrush current during startup. |
| 7 FB | Output voltage feedback | Senses resistive divider output; internal 600mV reference enables precise regulation; high-impedance input (10–50nA). |
| 8 CR | External ramp compensation | Connects to VOUT via capacitor (e.g., 100pF) to stabilize COT loop with low-ESR ceramic capacitors. |
| 9 EN | Enable control | Active-high digital input; internal 1MΩ pulldown allows floating shutdown; clamped to 6.5V Zener for overvoltage protection. |
| 10 BST | Bootstrap supply for HS gate driver | Requires 0.1μF ceramic capacitor between BST and SW; self-charged during LS conduction; UVLO threshold 2.2V. |
| 11 VCC | Internal 5V LDO output | Supplies internal circuitry; requires 1μF ceramic decoupling placed adjacent to pin; not intended as system supply rail. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <10μs load transient response without external compensation, simplifying design for dynamic SoC loads. |
| Programmable Soft-Start | Adjustable startup time via SS capacitor prevents inrush into large output capacitance (e.g., ≥330μF SSD rails). |
| Power-Good (PG) Output | Provides system-level sequencing confirmation with 140μs delay and defined UV/OV thresholds - critical for multi-rail SoC boot. |
| Dual-Mode Operation | Forced PWM ensures fixed frequency for EMI filtering; auto PFM/PWM boosts light-load efficiency by skipping cycles below ~100mA. |
| Integrated Protection Suite | Includes hiccup-mode SCP, cycle-by-cycle OCP, thermal shutdown, and input UVLO - eliminates need for external fault management. |
Applications
| Tablet PC Core Rail | Solid-State Drive (SSD) Controller Supply |
|---|---|
|
Use Scenario: Powers ARM-based application processor cores requiring tightly regulated 1.2V @ 1.5A with rapid load transients during UI rendering and video decode. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable core voltage; COT control maintains <±15mV regulation during 1A/μs load steps. Use Value: 40μA quiescent current extends battery life during screen-off idle; QFN-14 footprint saves board area in thin-profile designs. |
Use Scenario: Supplies 3.3V to NAND flash controller ICs in M.2 SATA and NVMe SSD modules, where standby current and thermal headroom are critical. IC Role / Device Role / Timing Role: Main power stage converting 5V or 12V system rail to 3.3V; PG signal synchronizes controller initialization with stable VOUT. Use Value: Auto PFM/PWM mode reduces no-load power to <100μW; thermal shutdown prevents derating in confined SSD enclosures. |
| Gaming Handheld SoC Rail | Battery-Operated Industrial Sensor Node |
|
Use Scenario: Generates 1.8V GPU core voltage in portable gaming devices, handling bursty 2A loads during 3D rendering while minimizing heat buildup. IC Role / Device Role / Timing Role: High-efficiency step-down converter with forced PWM mode selected for predictable EMI profile during sustained gameplay. Use Value: 110mΩ/40mΩ RDS(ON) yields >93% peak efficiency at 1.5A; compact QFN-14 eases layout in thermally constrained handheld chassis. |
Use Scenario: Powers ultra-low-power microcontroller and RF transceiver in wireless sensor nodes powered by 2-cell Li-ion (6–8.4V nominal). IC Role / Device Role / Timing Role: Primary DC/DC regulator enabling long-term operation on battery; soft-start prevents brownout during cold start. Use Value: 40μA IQ allows >5-year shelf life on 1Ah cell; EN pin enables MCU-controlled sleep/wake cycling with <1μA shutdown current. |
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 |
|---|---|---|---|
| MP2315DJ-LF-Z | 1.5A output, 25μA IQ, same QFN-10 (2mm×2mm) package; lacks PG and CR pins. | Lower current capacity and missing power-good signaling limit use in multi-rail SoC systems requiring sequencing. | Select when board space is tighter and 1.5A suffices; omit if PG or external ramp tuning is required. |
| TI TPS62864DRLR | 2A output, 15μA IQ, 1.8V–5.5V input; uses voltage-mode control with external compensation. | Narrower input range excludes direct replacement in 12V/19V industrial or battery-stack applications. | Prefer for ultra-low-IQ designs with stable 3.3V/5V inputs; avoid where 4–19V flexibility or COT simplicity is needed. |
Compared with MP2321GD-Z, MP2315DJ-LF-Z trades current capability and feature set for smaller size and lower IQ, while TPS62864DRLR offers superior light-load efficiency but sacrifices input voltage range and control-loop simplicity - making MP2321GD-Z optimal for 4–19V battery-operated systems needing robust, easy-to-design 2A regulation.
Availability
MP2321GD-Z is available at Aetrix Electronics and suitable for tablet PCs, solid-state drives, and battery-operated industrial sensor nodes requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP2321GD-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 across Asia and North America and global manufacturing partnerships.
The MP2321 belongs to MPS's high-efficiency, low-IQ DC/DC converter product line, engineered specifically for portable and battery-centric applications where standby power, thermal performance, and layout simplicity are critical system constraints.
FAQ
What is the minimum recommended soft-start capacitor value for MP2321GD-Z?
The minimum recommended soft-start capacitor is 4.7nF when output capacitance exceeds 330μF. This value ensures controlled ramp-up and avoids triggering current limit during startup. Smaller values (e.g., 1nF) may be used for lighter loads but increase risk of inrush-induced instability or OCP activation.
Can MP2321GD-Z operate with ceramic output capacitors only?
Yes - MP2321GD-Z supports ceramic-only output capacitors via external ramp compensation on the CR pin. A typical 100pF capacitor from CR to VOUT stabilizes the COT loop for 1.2V/2.2μH/22μF designs. Without CR compensation, low-ESR ceramics may cause subharmonic oscillation.
How does the FREQ/MODE pin determine switching frequency and control mode?
FREQ/MODE selects both frequency and mode: connecting to VIN enables forced PWM with frequency set by RFREQ = (VIN − 0.4) × 14.5 / FSW; connecting to GND enables auto PFM/PWM with RFREQ = (VIN − 0.4) × 13 / FSW. Floating FREQ/MODE is prohibited and may cause undefined behavior.
What is the purpose of the CR pin and how is it configured?
The CR pin provides external ramp compensation to stabilize the COT control loop when using low-ESR ceramic output capacitors. A capacitor (e.g., 100pF for 1.2V output) is connected from CR to VOUT. The internal ramp amplitude is set by VIN−VOUT, and VRamp should be tuned to 20–40mV for optimal stability.
Does MP2321GD-Z support pre-biased output startup?
Yes - MP2321GD-Z features monotonic pre-bias start-up. When the output is pre-charged, the device refreshes BST voltage and charges the SS capacitor simultaneously. Startup proceeds only once BST exceeds 2.2V and SS voltage surpasses the sensed FB voltage, preventing reverse current flow.
What happens during short-circuit protection and how does recovery work?
Under short-circuit, MP2321GD-Z enters hiccup mode: it disables power stage, discharges SS capacitor, waits ~10ms, then attempts soft-start again. Recovery is automatic and non-latching. Each hiccup cycle lasts ~15ms, limiting average power dissipation and enabling safe thermal recovery without external intervention.
Is the VCC pin intended for external use as a 5V supply rail?
No - VCC is an internal 5V LDO output solely for powering internal circuitry. It is not rated for external loading and must be decoupled with a dedicated 1μF ceramic capacitor placed adjacent to the pin. Drawing current from VCC will degrade regulation and may cause malfunction.
MP2321GD-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-VFQFN
- 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):
- 4V
- Voltage - Input (Max):
- 19V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 19V
- Current - Output:
- 2A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (2x3)
MP2321GD-Z FAQ
1.How can I place an order for MP2321GD-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2321GD-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 MP2321GD-Z reliable?
The price and inventory of MP2321GD-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2321GD-Z is usually 5 days.
3.What payment methods are accepted for MP2321GD-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2321GD-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2321GD-Z?
MP2321GD-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2321GD-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 MP2321GD-Z?
For technical support, including MP2321GD-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2321GD-Z requirements.
6.How does Aetrix verify that MP2321GD-Z is sourced from the original manufacturer or authorized distributors?
All MP2321GD-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 MP2321GD-Z meets industry standards.
7.What is the process for return or replacement of MP2321GD-Z?
All MP2321GD-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2321GD-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 MP2321GD-Z part is unused and in its original packaging.
Return procedure for MP2321GD-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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