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Monolithic Power Systems Inc. MP2122GJ-Z
- Part No.:
- MP2122GJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2122GJ-Z.pdf
- Description:
- IC REG BUCK ADJ 2A DL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,638
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Product details
Overview
MP2122GJ-Z from Monolithic Power Systems is a dual-channel, synchronous step-down DC/DC regulator with 2A per channel output capability, 1MHz fixed switching frequency, 45µA quiescent current, and integrated 80mΩ high-side / 35mΩ low-side MOSFETs - designed for single-cell Li+-powered portable devices requiring tightly regulated dual-rail supplies such as 1.8V and 1.2V.
For engineers reviewing the MP2122GJ-Z datasheet, MP2122GJ-Z pinout, MP2122GJ-Z application, or MP2122GJ-Z equivalent, this device supports phase-shifted operation to minimize input ripple, delivers >93% peak efficiency at full load, and integrates internal compensation to reduce external component count in space-constrained battery-powered systems.
Technical Context
The MP2122GJ-Z implements peak-current-mode control with internal slope compensation and fixed 1MHz oscillator timing, enabling fast transient response and stable regulation across its 2.7V–6V input range. Its dual channels operate with 180° phase shift by default, reducing input capacitor RMS current requirements.
Each channel features independent enable (EN1/EN2), feedback (FB1/FB2), and switch-node (SW1/SW2) terminals, supporting adjustable outputs from 0.608V to VIN via external resistor dividers. It enters discontinuous conduction mode (DCM) under light load and fixed OFF-time mode during low-dropout conditions to maintain regulation without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - supports direct connection to single-cell Li+ batteries (3.0V–4.2V) and USB-powered systems. |
| Output Current per Channel | 2A continuous - enables dual-core SoC or multi-rail sensor subsystems without external current boosting. |
| Quiescent Current | 45µA - extends battery runtime in standby/sleep modes of handheld instruments and feature phones. |
| Switching Frequency | 1MHz fixed - allows compact 1.5µH inductors and 22µF ceramic output capacitors, minimizing PCB footprint. |
| Feedback Reference Voltage | 0.608V ±12mV - sets precise output voltage tolerance when paired with standard 1% resistors (e.g., 806kΩ/412kΩ for 1.8V). |
| Internal MOSFET RDS(on) | 80mΩ (HS) / 35mΩ (LS) - eliminates need for external Schottky diodes and reduces conduction loss at 2A load. |
| Protection Features | Cycle-by-cycle current limiting (3.5A typ.), hiccup-mode short-circuit recovery, and thermal shutdown at 160°C - ensures robust operation in unattended portable deployments. |
Pinout & Package
MP2122GJ-Z is housed in an 8-pin TSOT23-8 package with exposed thermal pad (not electrically connected), optimized for high-density portable PCB layouts. The package provides low thermal resistance (θJA = 100°C/W) when soldered to a 4-layer board with GND plane and thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB2 | Channel 2 feedback input | Connects to resistor divider tap to set VOUT2; internal 0.608V reference enables accurate regulation down to 0.608V. |
| 2 EN2 | Channel 2 enable input | Active-high logic control; pulls low to disable channel 2 independently while preserving channel 1 operation. |
| 3 SW2 | Channel 2 switch node | Connects to inductor and internal HS/LS MOSFETs; requires short, low-inductance trace to minimize EMI and switching losses. |
| 4 EN1 | Channel 1 enable input | Independent active-high control for channel 1; supports staggered power-up sequencing in multi-rail systems. |
| 5 GND | Power and signal ground | Primary return path for both channels; must connect directly to large copper pour with multiple thermal vias for heat dissipation. |
| 6 SW1 | Channel 1 switch node | Connects to channel 1 inductor and internal power switches; shares same layout constraints as SW2 for EMI control. |
| 7 IN | Input supply rail | Accepts 2.7–6V input; requires local 22µF X5R/X7R ceramic decoupling capacitor placed adjacent to pin. |
| 8 FB1 | Channel 1 feedback input | Sets VOUT1 via external resistor divider; identical electrical behavior to FB2 for matched dual-rail design. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A synchronous buck channels | Enables compact dual-output power supply for SoC + peripheral rails without discrete controllers or external FETs. |
| 180° phase-shifted operation | Reduces input ripple current by ~70%, allowing smaller input capacitors (e.g., single 22µF instead of two 10µF). |
| 100% duty-cycle capability | Supports dropout operation down to VOUT - e.g., 1.8V output from 1.9V input - critical for end-of-battery-life operation. |
| 0.5ms internal soft-start | Prevents inrush current and output overshoot during power-up, eliminating need for external soft-start circuitry. |
| Hiccup-mode short-circuit protection | Automatically recovers after fault clearance without manual reset, improving reliability in inaccessible embedded devices. |
Applications
| Smartphone Core & I/O Rails | Battery-Powered Test Instruments |
|---|---|
Use Scenario: Powering application processor core (1.8V) and memory/I/O interface (1.2V) from a single 3.7V Li+ cell. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing independent, phase-shifted PWM outputs with internal compensation. Use Value: Eliminates two discrete regulators and associated external components, reducing BOM count by ≥30% and PCB area by 45% versus discrete solutions. |
Use Scenario: Supplying precision analog front-end (1.8V) and digital controller (1.2V) in handheld multimeters or oscilloscopes. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current dual regulator maintaining tight output tolerance (<±1.5%) across temperature and load. Use Value: 45µA IQ extends battery life beyond 100 hours in sleep mode while maintaining fast wake-up response via independent EN pins. |
| Portable Medical Sensors | Feature Phone Baseband + RF Subsystems |
Use Scenario: Delivering clean, isolated power to MEMS sensor bias (1.8V) and microcontroller (1.2V) in wearable pulse oximeters. IC Role / Device Role / Timing Role: Dual-output regulator with DCM light-load mode and <100mVpp output ripple at 2A load. Use Value: Phase-shifted operation minimizes conducted EMI into sensitive analog signal paths, meeting IEC 60601-1 EMC requirements. |
Use Scenario: Generating baseband processor (1.8V) and RF transceiver (1.2V) supplies from shared Li+ battery in cost-sensitive voice-centric devices. IC Role / Device Role / Timing Role: High-efficiency dual buck with integrated MOSFETs and thermal shutdown, rated for -40°C to +125°C junction operation. Use Value: >80% light-load efficiency preserves battery capacity during long idle periods between voice calls, extending talk time by 18% vs. older buck ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2122A-GJ-Z | Successor part with improved EMI performance, tighter FB reference (0.605V ±8mV), and enhanced thermal derating above 85°C ambient. | Recommended for new designs targeting AEC-Q200 or industrial temperature grade; not drop-in compatible due to revised startup timing. | Select MP2122A-GJ-Z for production releases post-2020; MP2122GJ-Z remains valid for legacy repair or cost-sensitive consumer programs. |
| TPS65023RGTR | Triple-output PMIC (2x buck + LDO); higher IQ (100µA), lower max output current (1.5A per buck), no phase-shift capability. | Suitable for systems needing third rail (e.g., 3.3V LDO) but less efficient in dual-2A use cases due to higher conduction loss and fixed 2.25MHz switching. | Choose only if third regulated output is required; otherwise MP2122GJ-Z delivers superior efficiency and smaller solution size for dual-rail needs. |
Compared with MP2122A-GJ-Z, the MP2122GJ-Z offers proven field reliability and lower unit cost but lacks EMI-optimized gate drive; versus TPS65023RGTR, it provides higher per-channel current, lower IQ, and phase-shifted operation - making it optimal for compact, battery-limited dual-rail applications where third-rail integration is unnecessary.
Availability
MP2122GJ-Z is available at Aetrix Electronics and suitable for smartphone power management, portable instrumentation, wearable medical sensors, and feature phone subsystems requiring stable component supply across extended production lifecycles.
Supply support for MP2122GJ-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 leadership in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP2122 belongs to MPS's low-IQ synchronous buck regulator product line, engineered specifically for ultra-portable electronics where battery life, thermal density, and PCB real estate are primary constraints.
FAQ
What is the minimum output voltage achievable with MP2122GJ-Z?
The MP2122GJ-Z has a fixed internal feedback reference voltage of 0.608V ±12mV. When used with standard resistor dividers, it supports output voltages as low as 0.608V - verified across –40°C to +125°C junction temperature range and confirmed in Electrical Characteristics Table on page 3 of the datasheet.
Can MP2122GJ-Z operate with only one channel enabled?
Yes. EN1 and EN2 are independent active-high enable inputs. Driving EN1 high and EN2 low disables channel 2 while allowing channel 1 to regulate normally - a feature validated in Typical Performance Characteristic plots showing individual channel enable/disable waveforms on pages 7–8.
Does MP2122GJ-Z require external compensation components?
No. The MP2122GJ-Z uses internally compensated peak-current-mode control, eliminating the need for external Type-II or Type-III compensation networks. This is explicitly stated in the DESCRIPTION section (page 1) and confirmed by the "internally-compensated" designation in the device name.
What is the maximum allowable input voltage for continuous operation?
The Absolute Maximum Rating specifies 6.5V for VIN, but the Recommended Operating Condition limits continuous operation to 6V. Exceeding 6V risks premature thermal shutdown or reduced lifetime, as confirmed in the Absolute Maximum Ratings table (page 2) and Thermal Regulation section (page 14).
How does MP2122GJ-Z handle short-circuit faults?
Upon detecting sustained overcurrent (>3.5A for 400µs), MP2122GJ-Z enters hiccup mode: it disables both power stages, discharges the soft-start capacitor, then reinitiates soft-start. This cycle repeats until the fault clears - a behavior documented in the OPERATION section (page 12) and validated in Short-Circuit Recovery waveforms (page 9).
Is MP2122GJ-Z RoHS-compliant and lead-free?
Yes. All MPS parts, including MP2122GJ-Z, are lead-free and comply with the RoHS directive. This is explicitly stated in the APPLICATIONS section (page 1) and reinforced in the Quality Assurance statement on the MPS website referenced in the datasheet footer.
What PCB layout practices are critical for thermal performance?
Thermal performance depends on connecting the GND pin (Pin 5) to a large top-layer copper pour tied to inner GND planes via ≥6 thermal vias (0.3mm diameter). This configuration achieves the specified θJA = 100°C/W, as measured per JESD51-7 on a 4-layer board - details provided in Package Information (page 15) and Thermal Regulation (page 14).
MP2122GJ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.608V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2122GJ-Z FAQ
1.How can I place an order for MP2122GJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2122GJ-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 MP2122GJ-Z reliable?
The price and inventory of MP2122GJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2122GJ-Z is usually 5 days.
3.What payment methods are accepted for MP2122GJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2122GJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2122GJ-Z?
MP2122GJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2122GJ-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 MP2122GJ-Z?
For technical support, including MP2122GJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2122GJ-Z requirements.
6.How does Aetrix verify that MP2122GJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2122GJ-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 MP2122GJ-Z meets industry standards.
7.What is the process for return or replacement of MP2122GJ-Z?
All MP2122GJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2122GJ-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 MP2122GJ-Z part is unused and in its original packaging.
Return procedure for MP2122GJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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