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Monolithic Power Systems Inc. MP2159AGJ-P
- Part No.:
- MP2159AGJ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MP2159AGJ-P.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,176
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Product details
Overview
MP2159AGJ-P 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. It delivers regulated output down to 0.6 V with ±1.5% feedback voltage accuracy, 17 μA quiescent current, and integrated 120 mΩ/90 mΩ power MOSFETs. It serves as primary power supply for FPGA core rails and portable instrument LDO pre-regulation stages.
For engineers reviewing the MP2159AGJ-P datasheet, MP2159AGJ-P pinout, MP2159AGJ-P application, or MP2159AGJ-P equivalent, key selection criteria include its COT control architecture for fast transient response, EN/PG signaling for power sequencing in multi-rail systems, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors without external compensation.
Technical Context
The MP2159AGJ-P implements a constant-on-time control scheme with input-voltage feedforward, enabling near-constant 1.5 MHz switching frequency across 2.5–6 V input and 0.6–VIN output ranges. Its internal high-side PFET (120 mΩ) and low-side NFET (90 mΩ) operate in synchronous rectification mode, supporting 100% duty-cycle operation during dropout.
It integrates cycle-by-cycle over-current protection with 2 A current limit threshold, hiccup-mode short-circuit recovery, and a dedicated open-drain PG pin with 550 kΩ internal pull-up to VIN and ±10% regulation window detection. Soft-start time is fixed at 1.15 ms (typ), and EN logic thresholds are 0.4 V (low) and 1.2 V (high).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 6 V - supports single-cell Li-ion, USB PD, and 3.3 V/5 V system rails |
| Output Current | 1 A continuous - sufficient for FPGA I/O banks or ARM Cortex-A series core supplies |
| Feedback Accuracy | ±1.5% at 25°C - ensures tight regulation for sub-1.2 V digital logic supplies |
| Quiescent Current | 17 μA - enables >1000-hour battery life in always-on sensor nodes |
| Switching Frequency | 1.5 MHz ±20% - allows use of compact 1 µH inductors and reduces EMI filtering burden |
| Thermal Shutdown | 150°C with 30°C hysteresis - provides robust overtemperature protection in sealed enclosures |
| Power Good Window | ±10% around 0.6 V FB - enables reliable rail monitoring for sequenced power-up of SoCs |
Pinout & Package
MP2159AGJ-P is housed in an 8-pin TSOT23-8 package with 0.65 mm pitch, exposed thermal pad (PGND-connected), and JEDEC MO-193BA compliance. The package supports ≤1.25 W continuous power dissipation at +25°C ambient (θJA = 100°C/W).
| 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 |
| 2 - VIN | Main power input | Accepts 2.5–6 V unregulated supply; requires local 10 µF ceramic decoupling |
| 3 - SW | Switch node | Drives external inductor; connects internally to source of PFET and drain of NFET |
| 4 - PGND | Power ground return | Low-impedance return path for high-current switching loop; tied to thermal pad |
| 5 - OUT | Output voltage sense | Direct connection to output capacitor anode; used for accurate remote sensing in high-current layouts |
| 6 - AGND | Analog ground reference | Reference for FB comparator and internal bias circuits; must be star-connected to PGND at single point |
| 7 - FB | Feedback input | Resistor-divider tap point; sets output voltage per VOUT = 0.6 × (1 + R1/R2) |
| 8 - EN | Enable control | Active-high logic input; internal 1 MΩ pulldown; enables device when >1.2 V |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <10 µs load transient response without external compensation components |
| Integrated Power MOSFETs | 120 mΩ PFET + 90 mΩ NFET reduce conduction loss and eliminate external driver complexity |
| Light-Load DCM Operation | Proprietary zero-current detection extends efficiency below 10 mA by disabling low-side switch |
| EN and PG Signaling | Supports precise power sequencing in multi-rail systems (e.g., FPGA core → I/O → auxiliary) |
| Stable with Ceramic Output Caps | No external type-II or type-III compensation required - simplifies layout and BOM |
Applications
| Wireless Networking Card Power | Portable Instrument Core Supply |
|---|---|
Use Scenario: Powering 802.11ac baseband ICs and RF transceivers on mini-PCIe Wi-Fi modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.1 V @ 800 mA to baseband processor core. Use Value: 17 μA IQ extends battery runtime in handheld test equipment; 1.5 MHz switching avoids interference with 2.4 GHz ISM band. | Use Scenario: Generating clean 1.2 V supply for ARM Cortex-M7 microcontroller in handheld multimeters. IC Role / Device Role / Timing Role: Main system regulator feeding MCU VDDCORE, with PG signal triggering firmware initialization. Use Value: ±1.5% VFB accuracy maintains MCU timing margin across temperature; TSOT23-8 footprint saves PCB area in space-constrained enclosures. |
| Battery-Powered Sensor Node | Low-Voltage I/O System Power |
Use Scenario: Regulating 3.3 V from 3.7 V Li-ion cell for BLE SoC and analog front-end in environmental sensors. IC Role / Device Role / Timing Role: Pre-regulator stepping down to 3.3 V before low-noise LDO for ADC reference. Use Value: 100% duty-cycle capability sustains output during battery discharge to 3.2 V; hiccup-mode protection prevents thermal runaway during sensor fault conditions. | Use Scenario: Supplying 1.8 V to DDR3L memory interface in embedded vision modules. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter placed adjacent to memory BGA. Use Value: Low ESR ceramic capacitor compatibility minimizes output ripple (<15 mVpp), preserving DDR3L setup/hold timing margins. |
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 current; 2.5 V–5.5 V input; 2.5% FB accuracy; 25 μA IQ | Targets higher-power processors; lacks PG pin and OUT sense terminal | Select when >1 A load or tighter input range suffices, but avoid if PG sequencing or remote sensing is required |
| RT7297CGQW | 1.2 A output; 4.5 V–18 V input; 1.2 MHz; 28 μA IQ; no PG or OUT pins | Designed for industrial 12 V rails; incompatible with sub-4.5 V battery inputs | Choose only for 5–12 V systems where extended input range outweighs missing sequencing features |
Compared with TPS62865ARGTR and RT7297CGQW, MP2159AGJ-P uniquely combines PG signaling, OUT sense, ultra-low IQ, and 2.5 V minimum input-making it optimal for battery-powered, multi-rail portable systems requiring precise power sequencing and long standby life.
Availability
MP2159AGJ-P is available at Aetrix Electronics and suitable for wireless networking cards, portable instruments, and battery-powered sensor nodes requiring stable component supply, full production traceability, and lifecycle continuity assurance.
Supply support for MP2159AGJ-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, headquartered in Kirkland, WA, with global design and support centers.
The MP2159A product line targets space-constrained, battery-sensitive applications requiring high efficiency at light loads, fast transient response, and minimal external components-specifically optimized for portable computing, IoT edge nodes, and instrumentation.
FAQ
What is the minimum recommended output capacitor value for stable operation?
The MP2159AGJ-P is stable with ≥10 µF X5R/X7R ceramic output capacitors. Lower values may cause instability due to insufficient phase margin; using 22 µF improves transient response and reduces output ripple under dynamic loads. ESR must remain below 10 mΩ for optimal performance.
Does MP2159AGJ-P require external compensation components?
No. The MP2159AGJ-P uses constant-on-time control and is internally compensated. It operates stably with standard ceramic output capacitors without any external RC networks, type-II or type-III compensators, or feedforward capacitors-reducing BOM count and layout complexity.
How does the PG pin behave during startup and fault conditions?
The PG pin remains low until the FB voltage reaches and stays within ±10% of 0.6 V for ≥50 µs. During undervoltage, overcurrent, or thermal shutdown, PG pulls low immediately. It has a 550 kΩ internal pull-up to VIN and can sink ≥1 mA when asserted low, enabling direct interfacing with microcontroller GPIOs.
Can MP2159AGJ-P operate with input voltage below 2.5 V?
No. The absolute minimum operating input voltage is 2.5 V per datasheet specifications. Below this, UVLO disables the device. The under-voltage lockout rising threshold is 2.3 V (typ), with 260 mV hysteresis-ensuring reliable turn-on only within the validated 2.5–6 V range.
What is the maximum achievable output voltage with MP2159AGJ-P?
The maximum output voltage is limited by the input voltage minus diode drop in dropout, but practically constrained by the FB divider's resistor ratio and stability. With standard 200 kΩ/200 kΩ divider, 1.2 V is typical; using R1=200 kΩ and R2=44.2 kΩ yields 3.3 V. Output cannot exceed VIN, and stability degrades above ~5 V due to reduced duty cycle headroom.
Is the TSOT23-8 package thermally enhanced?
Yes. The TSOT23-8 package includes an exposed thermal pad connected to PGND, enabling direct thermal coupling to PCB copper. With proper 4-layer board layout (≥2 cm² thermal pad area, 4+ vias to inner ground plane), θJA drops from 100°C/W to ~55°C/W, allowing full 1 A operation up to +85°C ambient.
MP2159AGJ-P 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-P FAQ
1.How can I place an order for MP2159AGJ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2159AGJ-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 MP2159AGJ-P reliable?
The price and inventory of MP2159AGJ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2159AGJ-P is usually 5 days.
3.What payment methods are accepted for MP2159AGJ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2159AGJ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2159AGJ-P?
MP2159AGJ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2159AGJ-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 MP2159AGJ-P?
For technical support, including MP2159AGJ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2159AGJ-P requirements.
6.How does Aetrix verify that MP2159AGJ-P is sourced from the original manufacturer or authorized distributors?
All MP2159AGJ-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 MP2159AGJ-P meets industry standards.
7.What is the process for return or replacement of MP2159AGJ-P?
All MP2159AGJ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2159AGJ-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 MP2159AGJ-P part is unused and in its original packaging.
Return procedure for MP2159AGJ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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