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Monolithic Power Systems Inc. MP2122AGJ-Z
- Part No.:
- MP2122AGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2122AGJ-Z.pdf
- Description:
- IC REG BCK ADJ 2A/2A DL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,888
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Product details
Overview
MP2122AGJ-Z from Monolithic Power Systems is a dual-channel, synchronous step-down DC/DC regulator with integrated 80mΩ high-side and 35mΩ low-side MOSFETs per channel, delivering up to 2A per output from a 2.7V–6V input, featuring 45µA quiescent current, 1MHz fixed switching frequency, and 180° phase-shifted operation for reduced input ripple - deployed in battery-powered handheld devices requiring dual low-noise rail generation.
For engineers reviewing the MP2122AGJ-Z datasheet, MP2122AGJ-Z pinout, MP2122AGJ-Z application, or MP2122AGJ-Z equivalent, key selection criteria include dual-output light-load efficiency (>80%), internal compensation eliminating external loop components, TSOT23-8 thermal performance (θJA = 100°C/W), and hiccup-mode short-circuit protection with 3.5A cycle-by-cycle current limit.
Technical Context
The MP2122AGJ-Z implements peak-current mode control with internal compensation across two independent PWM channels, each supporting 0.608V–VIN adjustable output via resistor-divider feedback (FB1/FB2). Its 180° phase-shifted operation reduces input capacitor RMS current by ~30% versus in-phase dual buck converters.
Advanced light-load mode enables discontinuous conduction mode (DCM) with reverse-inductor-current detection, while fixed-off-time operation maintains regulation during low-dropout conditions. Thermal shutdown activates at 160°C with 30°C hysteresis, and soft-start time is fixed at 0.5ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - supports single-cell Li+ battery operation with 2.5V UVLO threshold and 300mV hysteresis. |
| Output Voltage Range | 0.608V to 5.5V - set by external resistor dividers; FB voltage tolerance ±12mV (0.596–0.620V) ensures <±2% output accuracy. |
| Switching Frequency | 1MHz (±20%) - fixed-frequency PWM with phase-shifted clocks; drops to fixed-off-time mode under low dropout. |
| Quiescent Current | 45µA typical - enables >80% efficiency at 1mA load, critical for standby power in portable systems. |
| Current Limit | 3.5A typical per channel - cycle-by-cycle over-current protection triggers hiccup mode after 400µs fault duration. |
| Thermal Shutdown | 160°C with 30°C hysteresis - protects die during sustained overload; θJA = 100°C/W on 4-layer PCB. |
| Package | TSOT23-8 - 8-pin thermally enhanced package with exposed GND pad; footprint compatible with standard SMT reflow profiles. |
Pinout & Package
MP2122AGJ-Z uses an 8-pin TSOT23 package with exposed thermal pad connected to GND (Pin 5). The package measures 2.9mm × 1.6mm × 0.85mm and supports JEDEC-standard reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB2) | Channel 2 feedback input | Error amplifier inverting input; connects to resistor divider tap to set VOUT2 with 0.608V reference. |
| 2 (EN2) | Channel 2 enable input | Active-high logic control; pulls below 0.4V to disable buck 2; hysteresis improves noise immunity. |
| 3 (SW2) | Channel 2 switch node | Connects to internal HS/LS MOSFETs and external inductor; high dv/dt node requiring tight layout. |
| 4 (EN1) | Channel 1 enable input | Active-high logic control; independent of EN2 for staggered startup or power sequencing. |
| 5 (GND) | Power and signal ground | Common return for all channels; must connect to large PCB ground plane and thermal vias for heat dissipation. |
| 6 (SW1) | Channel 1 switch node | Connects to internal HS/LS MOSFETs and external inductor; 180° phase-shifted relative to SW2. |
| 7 (IN) | Main input supply | Accepts 2.7V–6V; requires local 22µF ceramic decoupling capacitor placed adjacent to Pin 7 and Pin 5. |
| 8 (FB1) | Channel 1 feedback input | Error amplifier inverting input; sets VOUT1 independently using separate resistor divider network. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A synchronous outputs | Integrated 80mΩ HS-FET + 35mΩ LS-FET per channel eliminates external Schottky diodes and reduces BOM count. |
| 180° phase-shifted operation | Reduces input ripple current amplitude by ~70%, enabling smaller input capacitors (e.g., single 22µF X5R instead of two). |
| Advanced light-load DCM mode | Detects reverse inductor current and disables LS-FET to prevent shoot-through loss, sustaining >80% efficiency at 1mA. |
| Internal soft-start | Fixed 0.5ms ramp time prevents output overshoot and limits inrush current during power-up sequences. |
| Hiccup-mode short-circuit protection | Disables output stage for 400µs after sustained overcurrent, then retries soft-start - prevents thermal runaway during faults. |
Applications
| Smartphone Core & I/O Rails | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Dual-rail power for application processor core (1.2V) and memory/I/O interface (1.8V) in compact smartphone PCBs. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing isolated, phase-shifted, low-noise DC supplies with independent enable control. Use Value: 180° phase shift cuts input capacitor RMS current by 30%, allowing space-constrained 22µF ceramic solution instead of larger bulk capacitance. |
Use Scenario: Powering microcontroller, sensor front-end, and display driver in battery-operated glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Dual-output PMIC delivering stable, low-quiescent-current rails for mixed-signal subsystems with strict battery life targets. Use Value: 45µA IQ and >80% light-load efficiency extend single-cell Li+ battery runtime beyond 72 hours in standby monitoring mode. |
| Wireless Headset SoC Supply | Industrial Handheld Scanner |
|
Use Scenario: Generating clean 1.1V core and 3.3V RF/analog rails for Bluetooth LE SoCs in ultra-low-profile earbuds. IC Role / Device Role / Timing Role: Compact dual buck converter with minimal external components (2 inductors, 4 resistors, 5 caps) meeting stringent size constraints. Use Value: TSOT23-8 footprint (2.9×1.6mm) and internal compensation eliminate need for external compensation networks, saving >3mm² PCB area. |
Use Scenario: Powering ARM Cortex-M7 MCU, barcode imager, and BLE radio in ruggedized warehouse scanners operating from 3.7V Li-ion packs. IC Role / Device Role / Timing Role: Robust dual regulator with hiccup-mode SCP and thermal shutdown ensuring reliable operation under intermittent high-current bursts. Use Value: 3.5A per-channel current limit and 160°C thermal shutdown protect against motor-driver-induced load dumps and ESD transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65217C | Single-chip PMIC with dual 2A bucks + LDOs + fuel gauge; 2.7–5.5V input; 1.2MHz switching; no phase shift. | Targets full-system power management (not just dual rails); requires more external components for standalone dual-buck use. | Select when integrating battery gauge, RTC, or USB charging is required alongside dual regulation. |
| RTQ2134B-QT | Dual 2A buck with 2.5–5.5V input; 2.4MHz switching; 95% peak efficiency; no internal phase shift; 25µA IQ. | Better light-load efficiency but lacks 180° phase shift and fixed-off-time low-dropout mode. | Select when higher switching frequency enables smaller magnetics and board area is more constrained than input ripple budget. |
Compared with TPS65217C and RTQ2134B-QT, MP2122AGJ-Z uniquely combines 180° phase shift, 45µA IQ, and fixed-off-time low-dropout operation in a minimal 8-pin TSOT23 package - making it optimal for space- and battery-life-critical dual-rail designs without system-level PMIC complexity.
Availability
MP2122AGJ-Z is available at Aetrix Electronics and suitable for smartphone power delivery, portable medical instrumentation, wireless headset SoC supply, and industrial handheld scanner applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2122AGJ-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 in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2122A belongs to MPS's low-IQ dual buck regulator product line, engineered specifically for space-constrained, battery-powered consumer and medical devices demanding high efficiency across full load range and minimal external component count.
FAQ
What is the minimum output voltage supported by MP2122AGJ-Z?
The MP2122AGJ-Z supports output voltages as low as 0.608V, set by the internal reference voltage at the FB pins. This value is guaranteed across temperature (−40°C to +125°C) with ±12mV tolerance, enabling precise 1.0V, 1.2V, or 1.8V rail generation using standard resistor dividers.
Does MP2122AGJ-Z require external compensation components?
No - the MP2122AGJ-Z features fully internal compensation for both channels, eliminating the need for external Type-II or Type-III compensation networks. This reduces bill-of-materials count and PCB area while maintaining stable loop response across 0.608V–5.5V output configurations.
How does the 180° phase shift improve system-level performance?
The 180° phase shift between SW1 and SW2 reduces input capacitor RMS current by approximately 30%, lowering heating and enabling smaller ceramic input capacitors (e.g., one 22µF instead of two). It also minimizes conducted EMI at the fundamental switching frequency and its harmonics.
Can MP2122AGJ-Z operate with only one channel enabled?
Yes - EN1 and EN2 are independent logic inputs. Either channel can be disabled while the other remains active, supporting flexible power sequencing, dynamic rail scaling, or fault isolation. When one channel is disabled, the other continues full 2A operation with unchanged regulation accuracy and transient response.
What thermal derating guidance applies for continuous 2A operation?
At TA = +85°C and with standard 4-layer PCB layout (100°C/W θJA), maximum continuous output current per channel is ~1.5A before reaching 125°C junction limit. For full 2A per channel at elevated ambient, increase copper area on GND plane and add ≥6 thermal vias under the exposed pad to reduce θJA toward 55°C/W.
Is MP2122AGJ-Z qualified for automotive applications?
No - MP2122AGJ-Z is rated for industrial temperature range (−40°C to +125°C) but is not AEC-Q200 qualified. It lacks automotive-specific stress testing, failure-in-time (FIT) reporting, and PPAP documentation. For automotive use, consider MPS's automotive-grade MPQ2122 series.
What is the recommended input capacitor configuration?
MPS recommends a single 22µF X5R/X7R ceramic capacitor placed directly between IN (Pin 7) and GND (Pin 5), with low-ESR (<10mΩ) and voltage rating ≥10V. Additional 0.1µF high-frequency bypass near the same pins further suppresses switching noise.
MP2122AGJ-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:
- Active
- 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, 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
MP2122AGJ-Z FAQ
1.How can I place an order for MP2122AGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2122AGJ-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 MP2122AGJ-Z reliable?
The price and inventory of MP2122AGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2122AGJ-Z is usually 5 days.
3.What payment methods are accepted for MP2122AGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2122AGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2122AGJ-Z?
MP2122AGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2122AGJ-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 MP2122AGJ-Z?
For technical support, including MP2122AGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2122AGJ-Z requirements.
6.How does Aetrix verify that MP2122AGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2122AGJ-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 MP2122AGJ-Z meets industry standards.
7.What is the process for return or replacement of MP2122AGJ-Z?
All MP2122AGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2122AGJ-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 MP2122AGJ-Z part is unused and in its original packaging.
Return procedure for MP2122AGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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