My Inquiry
My Account
Monolithic Power Systems Inc. MP2321GD-P
- Part No.:
- MP2321GD-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFQFN
- Datasheet:
-
MP2321GD-P.pdf
- Description:
- IC REG 2A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,465
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP2321GD-P from Monolithic Power Systems is a synchronous step-down DC/DC converter optimized for battery-powered systems, delivering 2A continuous output current with 40µA quiescent current, 4V–19V input range, and adjustable 0.6V–VIN output voltage using constant-on-time (COT) control. It integrates 110mΩ/40mΩ high-side/low-side MOSFETs and features power good indication, programmable soft-start, and hiccup-mode short-circuit protection - deployed in tablet PCs and SSDs.
For engineers reviewing the MP2321GD-P datasheet, MP2321GD-P pinout, MP2321GD-P application, or MP2321GD-P equivalent, key selection criteria include light-load efficiency (40µA IQ), COT-based transient response, QFN-14 (2mm×3mm) thermal performance (θJA = 70°C/W), and mode-selectable operation (forced PWM vs. auto PFM/PWM).
Technical Context
The MP2321GD-P implements constant-on-time (COT) control with internal ramp compensation, enabling fast load-transient response without external loop compensation components. Its dual-mode operation-selectable via FREQ/MODE pin connection to VIN (forced PWM) or GND (auto PFM/PWM)-supports both stable full-load regulation and ultra-low-IQ light-load efficiency.
It integrates synchronous power switches with 110mΩ high-side and 40mΩ low-side RDS(ON), supports pre-biased start-up, and includes comprehensive protection: thermal shutdown (150°C, 20°C hysteresis), hiccup-mode SCP/OCP, under-voltage lockout (3.7V rising threshold), and open-drain power good with 140µs delay and ±5% window detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 19V - supports wide-input industrial and battery-supplied rails including single-cell LiFePO₄ up to 4S Li-ion. |
| Output Current | 2A continuous - sufficient for core logic rails in tablets, SSD controllers, and portable gaming SoCs. |
| Quiescent Current | 40µA - enables >1000-hour standby in always-on battery applications without significant drain. |
| Feedback Reference | 600mV ±1% - sets precise output voltage via external resistor divider; enables 0.6V–VIN adjustment. |
| Switching Frequency | Programmable up to ~1.1MHz - allows compact 2.2µH inductors and 22µF ceramic output capacitors. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects die during sustained overload or poor PCB thermal design. |
| Power Good Accuracy | ±5% window (0.85×VFB to 1.1×VFB) with 140µs delay - provides reliable system power sequencing and fault reporting. |
Pinout & Package
MP2321GD-P is housed in a thermally enhanced QFN-14 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad for PCB heat dissipation. The package supports ≤1.8W continuous power dissipation (θJA = 70°C/W on 4-layer board) and requires careful layout of SW, VIN, GND, and BST traces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12 | GND | System ground reference for output regulation and thermal path; must connect to large copper pour with multiple vias. |
| 2, 13 | SW | Switch node connecting internal HS/LS MOSFETs; requires wide trace and minimal loop area to reduce EMI and switching loss. |
| 3, 14 | VIN | Main input supply (4–19V); decoupled by ≥10µF ceramic capacitor placed near pin with low-ESR layout. |
| 4 | FREQ/MODE | Configures switching frequency and operating mode: pull to VIN for forced PWM, to GND for auto PFM/PWM. |
| 5 | PG | Open-drain power good indicator; requires external 100kΩ pull-up to VCC; asserts after FB reaches 90% VREF + 140µs. |
| 6 | SS | Soft-start capacitor node; 8µA internal current source ramps output voltage linearly to prevent inrush current. |
| 7 | FB | Feedback input monitoring output voltage via resistor divider; 600mV reference enables precision regulation. |
| 8 | CR | External ramp compensation node; connects capacitor from VOUT to CR to stabilize PWM operation with low-ESR ceramics. |
| 9 | EN | Enable control with 1MΩ internal pulldown; logic-high (>1.6V) enables regulator; clamped at 6.5V Zener. |
| 10 | BST | Bootstrap supply for high-side gate driver; requires 0.1µF ceramic capacitor between BST and SW. |
| 11 | VCC | Internal 5V LDO bias supply; requires 1µF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <10µs load transient response without external compensation components; ideal for dynamic SoC core rails. |
| Ultra-Low Quiescent Current | 40µA in active regulation - extends battery life in always-on IoT sensors and portable medical devices. |
| Synchronous Power Stage | Integrated 110mΩ HS / 40mΩ LS MOSFETs - eliminates external diode losses and improves full-load efficiency >92%. |
| Programmable Soft-Start | Adjustable via SS capacitor (e.g., 4.7nF → ~3.5ms ramp) - prevents output overshoot and inrush-triggered OCP. |
| Hiccup-Mode Short-Circuit Protection | Auto-recovery with periodic soft-start attempts - maintains system reliability without latch-off during intermittent faults. |
| Pre-Biased Start-Up Support | Monotonic ramp into pre-charged outputs - essential for hot-swap and multi-rail sequencing in SSDs and embedded systems. |
Applications
| Tablet PC Power Rail | Solid State Drive Core Supply |
|---|---|
|
Use Scenario: Powers ARM-based application processor cores (e.g., Cortex-A7x) requiring tightly regulated 1.2V @ 1.8A with fast DVFS transitions. IC Role / Device Role / Timing Role: Primary buck regulator providing dynamically scaled core voltage; COT control ensures sub-10µs response to CPU frequency jumps. Use Value: Maintains SoC stability during burst workloads while sustaining >89% efficiency at 10mA–2A load range. |
Use Scenario: Supplies 3.3V or 1.8V to NAND flash controller and DRAM cache in M.2 SATA/NVMe SSD modules. IC Role / Device Role / Timing Role: Secondary buck converter delivering low-noise, low-ripple power with PG signaling for host controller reset coordination. Use Value: Enables reliable hot-plug operation and meets JEDEC JESD22-A114 ESD immunity requirements via robust EN/PG sequencing. |
| Gaming Handheld SoC Core | Battery-Operated Medical Sensor |
|
Use Scenario: Regulates GPU and CPU voltage domains in portable gaming consoles (e.g., 1.05V @ 2A) with aggressive thermal constraints. IC Role / Device Role / Timing Role: High-efficiency synchronous buck managing peak power bursts during gameplay; thermal shutdown prevents throttling-induced frame drops. Use Value: Delivers 93% peak efficiency at 1.2A and sustains 2A continuous under 65°C ambient with QFN-14 thermal pad soldered to inner layer copper. |
Use Scenario: Powers ultra-low-power MCU and analog front-end in wearable ECG monitors running on coin-cell or LiPo batteries. IC Role / Device Role / Timing Role: Always-on buck converter maintaining 3.0V rail during sleep (40µA IQ) and scaling to 2A during sensor acquisition bursts. Use Value: Extends battery runtime beyond 72 hours per charge while supporting rapid wake-up from deep sleep without output undershoot. |
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 |
|---|---|---|---|
| MP2316GQ-P | Same QFN-14 package; lower 1.5A rating; 30µA IQ; fixed 500kHz frequency; no FREQ/MODE pin. | Targeted at cost-sensitive, lower-current applications where programmable frequency and dual-mode operation are unnecessary. | Select when 1.5A output and fixed-frequency simplicity outweigh need for 2A headroom and light-load PFM flexibility. |
| TPS54202DRCT | TI part in 10-pin WSON (3mm×3mm); 2A rating; 2µA shutdown IQ; 4.5–17V input; current-mode control; no integrated PG. | Preferred in TI-centric designs requiring tight EMI control and compatibility with WEBENCH tools; lacks hiccup-mode SCP. | Choose if existing TI ecosystem integration, lower shutdown IQ, or current-mode loop tuning outweigh need for PG signal and hiccup recovery. |
Compared with MP2321GD-P, MP2316GQ-P trades 0.5A output and mode flexibility for lower IQ and BOM simplification, while TPS54202DRCT offers TI-specific toolchain support but omits power good signaling and hiccup-mode fault recovery - making MP2321GD-P optimal for battery-constrained, self-contained systems requiring autonomous fault handling and precise sequencing.
Availability
MP2321GD-P is available at Aetrix Electronics and suitable for tablet PCs, solid state drives, portable gaming hardware, and battery-operated medical sensors requiring stable component supply across extended production lifecycles.
Supply support for MP2321GD-P 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 two decades of leadership in DC/DC conversion, motor drivers, and LED lighting solutions.
The MP2321 belongs to MPS's high-efficiency, low-IQ buck converter product line, engineered specifically for space-constrained, battery-powered applications demanding fast transient response, thermal resilience, and seamless power sequencing.
FAQ
What is the minimum recommended soft-start capacitor value for MP2321GD-P?
The minimum recommended soft-start capacitor is 4.7nF when output capacitance exceeds 330µF. This ensures controlled ramp rate and avoids triggering over-current protection during startup. Smaller values (e.g., 2.2nF) may be used for lower-output-capacitance designs but require verification against inrush current limits.
Can MP2321GD-P operate with a 3.3V input supply?
No. MP2321GD-P has a minimum input voltage of 4V due to its under-voltage lockout threshold (3.7V typical rising). Operation below 4V will cause the device to remain disabled; it is not rated for 3.3V rail regulation.
How does the FREQ/MODE pin affect switching behavior?
Connecting FREQ/MODE to VIN configures forced PWM mode - ensuring constant frequency and continuous conduction regardless of load. Connecting it to GND enables auto PFM/PWM mode - reducing switching frequency at light loads to maintain >85% efficiency down to 100µA output current.
Is external ramp compensation required for all output capacitor types?
Yes - external ramp compensation via the CR pin is mandatory when using low-ESR ceramic output capacitors (e.g., X5R/X7R MLCCs) to ensure PWM-mode stability. The recommended Cr value depends on VOUT, VIN, and switching frequency, with typical values ranging from 56pF to 150pF.
What is the maximum allowable output voltage for MP2321GD-P?
The maximum output voltage is limited by the input voltage and duty cycle constraint: VOUT ≤ VIN × DMAX. With minimum off-time of 150ns and typical 90ns minimum on-time, VOUT is practically capped at ~95% of VIN across the 4–19V input range - e.g., 18V max at 19V input.
Does MP2321GD-P support output voltage tracking during power-up?
No. MP2321GD-P does not include dedicated tracking functionality. However, its pre-biased start-up capability allows monotonic ramping even when the output is initially held at a non-zero voltage by external circuitry - useful in multi-rail systems with staggered enable timing.
What thermal derating applies above 85°C ambient temperature?
Derating follows PDMAX = (150°C − TA) / 70°C/W. At 85°C ambient, maximum continuous power dissipation drops to 0.93W. Layout improvements (e.g., 2oz copper, thermal vias under EPAD) can improve θJA and extend usable power at elevated temperatures.
MP2321GD-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- *
- Package/Case:
- 14-VFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (2x3)
MP2321GD-P FAQ
1.How can I place an order for MP2321GD-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2321GD-P 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-P reliable?
The price and inventory of MP2321GD-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2321GD-P is usually 5 days.
3.What payment methods are accepted for MP2321GD-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2321GD-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2321GD-P?
MP2321GD-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2321GD-P 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-P?
For technical support, including MP2321GD-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2321GD-P requirements.
6.How does Aetrix verify that MP2321GD-P is sourced from the original manufacturer or authorized distributors?
All MP2321GD-P 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-P meets industry standards.
7.What is the process for return or replacement of MP2321GD-P?
All MP2321GD-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2321GD-P, 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-P part is unused and in its original packaging.
Return procedure for MP2321GD-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP2321GD-P 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…
