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Monolithic Power Systems Inc. MP2159AGJ-Z
- Part No.:
- MP2159AGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2159AGJ-Z.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:24,500
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Product details
Overview
MP2159AGJ-Z from Monolithic Power Systems is a 1 A, 6 V input, 1.5 MHz constant-on-time (COT) synchronous step-down DC/DC converter in TSOT23-8 package, featuring 17 μA quiescent current, 0.6 V adjustable output, and integrated 120 mΩ/90 mΩ MOSFETs. It delivers stable power to FPGA I/O rails, portable instrument core logic, and low-voltage battery-powered subsystems with fast transient response and dropout operation.
For engineers reviewing the MP2159AGJ-Z datasheet, MP2159AGJ-Z pinout, MP2159AGJ-Z application, or MP2159AGJ-Z equivalent, key selection criteria include light-load efficiency at 17 μA IQ, ±1.5% VFB accuracy for precise regulation, EN/PG sequencing capability, 100% duty-cycle operation, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2159AGJ-Z implements a constant-on-time control architecture with input voltage feed-forward, enabling near-constant 1.5 MHz switching frequency across 2.5–6 V input and 0.6–VIN output ranges. Its internal 0.6 V reference and high-gain error amplifier support tight output regulation under dynamic load steps.
It integrates cycle-by-cycle over-current protection, thermal shutdown with 30°C hysteresis, hiccup-mode short-circuit recovery, and zero-current detection for discontinuous conduction mode (DCM) at light loads - all without requiring external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 6 V - supports single-cell Li-ion, USB, and 3.3 V/5 V rail inputs without pre-regulation. |
| Output Current | 1 A continuous - sufficient for FPGA I/O banks, microcontroller cores, and sensor signal chains. |
| VFB Accuracy | ±1.5% at 25°C - ensures ±18 mV error at 1.2 V output, critical for low-voltage logic compliance. |
| Quiescent Current | 17 μA - enables >10-year battery life in always-on IoT sensors powered from coin cells. |
| Switching Frequency | 1.5 MHz ±20% - allows use of sub-2 mm × 2 mm inductors and reduces output ripple filtering burden. |
| Internal MOSFET RDS(on) | 120 mΩ (HS), 90 mΩ (LS) - minimizes conduction loss at 1 A, supporting >90% peak efficiency at 5 V→1.2 V. |
| Power Good Threshold | ±10% around VFB - provides reliable system-level power sequencing and fault indication via open-drain PG pin. |
Pinout & Package
MP2159AGJ-Z is housed in a thermally enhanced TSOT23-8 package (2.9 mm × 1.6 mm × 0.85 mm), optimized for high-power-density portable designs with exposed PGND pad for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power good indicator | Pulled high to VIN via 550 kΩ internal resistor when FB is within ±10% of 0.6 V; sinks ≥1 mA at 0.4 V for host MCU monitoring. |
| 2 - VIN | Main input supply | Accepts 2.5–6 V unregulated input; requires local 10 µF ceramic capacitor to suppress high-frequency switching noise. |
| 3 - SW | Switch node | Drives external inductor; connects internally to HS and LS MOSFETs; must be routed short and away from sensitive analog traces. |
| 4 - PGND | Power ground return | High-current return path for HS/LS switches and input/output capacitors; tied to exposed thermal pad for θJA = 100°C/W. |
| 5 - OUT | Output voltage sense | Direct connection to regulated output node; used with AGND to improve PSRR and reduce noise coupling into feedback path. |
| 6 - AGND | Analog ground reference | Low-noise ground for internal reference, error amp, and FB comparator; must be separated from PGND and joined at single point. |
| 7 - FB | Feedback input | Monitors resistive divider output; 10–50 nA input bias enables use of high-value resistors (e.g., 200 kΩ/200 kΩ for 1.2 V). |
| 8 - EN | Enable control | Active-high logic input (1.2 V threshold); internal 1 MΩ pulldown allows floating-disable; supports power sequencing with upstream regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Eliminates external compensation, achieves <10 µs load transient recovery time with no loop tuning required. |
| 100% Duty-Cycle Operation | Enables dropout mode down to VOUT + VDS(on) × ILOAD, sustaining regulation even as input drops to ~0.8 V above output. |
| Light-Load DCM with ZCD | Zero-current detection disables LS-FET before reverse current flows, reducing switching losses and improving efficiency below 10 mA. |
| Integrated PG and EN Functions | Supports multi-rail power sequencing: EN enables startup timing; PG confirms regulation before releasing downstream reset signals. |
| Robust Fault Protection | Cycle-by-cycle current limit (≥2 A), thermal shutdown (150°C), and hiccup-mode short-circuit recovery prevent damage during faults. |
Applications
| Portable Medical Sensors | FPGA I/O Power Rails |
|---|---|
|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 1.8 V/1 A step-down regulator supplying ADC, Bluetooth SoC, and flash memory interface. Use Value: 17 μA quiescent current extends battery life beyond 10 years in standby; ±1.5% VFB ensures accurate sensor reference voltage. |
Use Scenario: Low-profile industrial FPGA module requiring clean, sequenced 1.2 V core and 1.8 V I/O supplies. IC Role / Device Role / Timing Role: Secondary 1.8 V/1 A regulator synchronized via EN/PG to main 1.2 V rail for safe power-up sequence. Use Value: 1.5 MHz switching enables compact 1 µH inductor; PG output triggers FPGA configuration enable after stable 1.8 V is confirmed. |
| USB-Powered Test Instruments | Smart Home Edge Node Controllers |
|
Use Scenario: Handheld oscilloscope accessory drawing burst current up to 800 mA from USB 5 V port. IC Role / Device Role / Timing Role: Main 3.3 V/1 A supply delivering low-noise power to precision op-amps and SAR ADCs. Use Value: COT control delivers <50 mV undershoot during 100 mA → 800 mA load step; 120 mΩ/90 mΩ MOSFETs limit thermal rise to <25°C at full load. |
Use Scenario: Battery-backed Zigbee coordinator node with motion sensor, LED indicators, and RF transceiver. IC Role / Device Role / Timing Role: System PMIC providing 3.3 V/1 A for MCU and radio, with EN controlled by battery monitor IC. Use Value: 2.5 V minimum input supports operation down to 2.7 V battery voltage; hiccup-mode protection prevents latch-up during RF transmit current surges. |
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 |
|---|---|---|---|
| TPS62865ARGTR | Higher 3 A output, 2.5 V–5.5 V input, 2.5 MHz switching, but 25 μA IQ and no PG pin. | Lacks power-good signaling; unsuitable where system-level sequencing or fault reporting is required. | Choose when higher current headroom is needed and sequencing is handled externally. |
| RT7295BGJ8F | 1 A, 4.5 V–18 V input, 500 kHz switching, 22 μA IQ, includes PG and EN, but larger SOT-23-6 package. | Wider input range trades off size and high-frequency performance; lower switching frequency demands larger magnetics. | Prefer when input exceeds 6 V (e.g., 12 V industrial bus) and board space permits larger inductor. |
Compared with TPS62865ARGTR and RT7295BGJ8F, MP2159AGJ-Z uniquely balances ultra-low IQ (17 μA), integrated PG/EN, 1.5 MHz operation, and TSOT23-8 footprint - making it optimal for space-constrained, battery-sensitive, and sequenced multi-rail systems.
Availability
MP2159AGJ-Z is available at Aetrix Electronics and suitable for portable medical sensors, FPGA I/O power rails, USB-powered test instruments, and smart home edge node controllers requiring stable component supply across production lifecycles.
Supply support for MP2159AGJ-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.
The MP2159A belongs to MPS's low-IQ COT buck converter product line, engineered specifically for battery-powered and space-constrained applications demanding high efficiency at light loads and robust transient response.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MP2159AGJ-Z is stable with ≥10 µF X5R/X7R ceramic output capacitors. Lower values may cause instability or excessive ripple; using two 4.7 µF capacitors in parallel improves high-frequency decoupling and thermal derating margin.
Can MP2159AGJ-Z operate with an input voltage below 2.5 V?
No - the absolute minimum operating input is 2.5 V per datasheet specifications. Below this, UVLO prevents startup and regulation cannot be guaranteed; attempting operation risks erratic behavior or failure to regulate.
How does the PG pin behave during startup and fault conditions?
PG remains low until VFB reaches and sustains within ±10% of 0.6 V for ≥50 µs. During overcurrent or thermal shutdown, PG pulls low within microseconds, providing immediate fault indication to host controllers.
Is an external soft-start capacitor required?
No - MP2159AGJ-Z includes internal soft-start with fixed ~1.15 ms ramp time. Adding external capacitance is unnecessary and may interfere with the built-in timing circuitry.
What is the maximum allowable PCB temperature rise at 1 A load?
At TA = 25°C and full 1 A load, junction temperature rise is limited to ≤125°C (TJ max = 150°C). With θJA = 100°C/W, typical case temperature rise is ~25°C - requiring no heatsink in standard 4-layer FR4 layouts.
Does MP2159AGJ-Z support forced PWM mode?
No - it operates exclusively in COT mode with automatic transition between CCM and DCM. There is no pin or register to force continuous switching; light-load efficiency is optimized via proprietary ZCD-based DCM entry.
What is the recommended layout practice for the AGND and PGND pins?
AGND and PGND must be separated on the PCB and joined at a single star point near the IC's ground pads. Routing AGND traces away from high di/dt paths (SW, VIN, PGND) prevents noise injection into the feedback loop.
MP2159AGJ-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:
- 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:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MP2159AGJ-Z FAQ
1.How can I place an order for MP2159AGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2159AGJ-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 MP2159AGJ-Z reliable?
The price and inventory of MP2159AGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2159AGJ-Z is usually 5 days.
3.What payment methods are accepted for MP2159AGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2159AGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2159AGJ-Z?
MP2159AGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2159AGJ-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 MP2159AGJ-Z?
For technical support, including MP2159AGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2159AGJ-Z requirements.
6.How does Aetrix verify that MP2159AGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP2159AGJ-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 MP2159AGJ-Z meets industry standards.
7.What is the process for return or replacement of MP2159AGJ-Z?
All MP2159AGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2159AGJ-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 MP2159AGJ-Z part is unused and in its original packaging.
Return procedure for MP2159AGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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