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Monolithic Power Systems Inc. MP2908AGF-P
- Part No.:
- MP2908AGF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP2908AGF-P.pdf
- Description:
- 4V-60V INPUT, CURRENT MODE SYNCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,299
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Product details
Overview
MP2908AGF-P from Monolithic Power Systems is a high-voltage synchronous step-down controller supporting 4V–60V input, driving dual N-channel MOSFETs with current-mode PWM control, ±1.5% 0.8V reference accuracy, 99.5% max duty cycle, and programmable 100–1000kHz switching frequency-used in automotive power supplies for engine control units requiring cold-crank operation.
For engineers reviewing the MP2908AGF-P datasheet, MP2908AGF-P pinout, MP2908AGF-P application, or MP2908AGF-P equivalent, key selection criteria include its dual-MOSFET gate drive capability, AAM/CCM mode selectability, precision OVP/OCP thresholds, thermal shutdown at 170°C, and TSSOP-20-EP package compatibility with high-density PCB layouts.
Technical Context
The MP2908AGF-P implements a current-mode PWM architecture with cycle-by-cycle peak current limiting, slope compensation, and internal error amplifier transconductance of 500 µS. Its control loop uses COMP voltage to modulate top-gate on-time based on FB feedback against a 0.8V reference.
It supports dual operational modes: continuous conduction mode (CCM) when CCM/AAM is floating or tied to VCC1, and advanced asynchronous mode (AAM) when CCM/AAM is pulled low (≥480mV), enabling variable-frequency light-load operation with hiccup-mode short-circuit protection and 25µs PG delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - enables direct battery-to-load conversion in 12V/24V/48V automotive and industrial systems without pre-regulation. |
| Feedback Reference | 0.800V ±1.5% - ensures output regulation accuracy across –40°C to +125°C junction temperature range. |
| Switching Frequency | 100kHz–1000kHz (programmable via FREQ resistor or external sync clock) - allows EMI optimization and inductor size trade-offs. |
| Max Duty Cycle | 99.5% - supports ultra-low dropout operation during automotive cold-crank (e.g., VIN = 4.5V → VOUT = 3.3V). |
| Current Limit Thresholds | 25mV (ILIM=GND), 50mV (ILIM=VCC1), 75mV (ILIM=float) - sets precise peak inductor current limits without external amplification. |
| OVP Threshold | 110–120% of VFB - triggers immediate discharge mode (LS-FET on, HS-FET off) to protect downstream loads from overvoltage damage. |
| Thermal Shutdown | 170°C with 20°C hysteresis - provides self-recovery protection under sustained overload or poor heatsinking conditions. |
Pinout & Package
TSSOP-20-EP package with exposed thermal pad; 0.65mm pitch, 6.5mm × 4.4mm body; RoHS-compliant, lead-free, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main input supply connection | Accepts 4–60V DC; requires local ceramic decoupling to suppress high-di/dt transients. |
| EN/SYNC (Pin 2) | Enable input / external clock sync node | 1.22V enable threshold with 140mV hysteresis; doubles as 100–1000kHz sync input for noise-sensitive applications. |
| VCC2 (Pin 3) | External bias supply input | Enables VCC1 regulation from external source (4.5–12V), reducing dissipation and improving efficiency vs. VIN-derived bias. |
| VCC1 (Pin 4) | Internal bias rail output | 5V regulated supply for gate drivers and analog circuitry; requires 1–4.7µF ceramic capacitor to SGND. |
| SGND (Pin 5) | Signal ground reference | Low-noise return for FB, COMP, SS; must connect to VOUT-side of output capacitors to minimize sensing errors. |
| SS (Pin 6) | Soft-start timing control | Charged by 4µA internal current source; sets ramp time via external capacitor to prevent output overshoot at startup. |
| COMP (Pin 7) | Error amplifier output | Connect RC network to SGND to stabilize control loop; directly controls PWM comparator threshold. |
| FB (Pin 8) | Output voltage feedback input | Compares resistive divider output against 0.8V reference; determines regulated output voltage (e.g., VOUT = 0.8 × (1 + R1/R2)). |
| CCM/AAM (Pin 9) | Mode selection control | Logic level selects CCM (high/floating) or AAM (low ≥480mV); enables efficiency optimization at light load. |
| FREQ (Pin 10) | Frequency programming node | Resistor to SGND sets oscillator frequency; 65kΩ yields ~300kHz typical switching frequency. |
| PG (Pin 11) | Power good open-drain output | Asserts low when VOUT deviates >±10% from target; 25µs delay ensures stable regulation before assertion. |
| ILIM (Pin 12) | Current limit configuration | Selects sense threshold: GND=25mV, VCC1=50mV, float=75mV - defines peak inductor current limit without external components. |
| SYNCO (Pin 13) | 180° out-of-phase clock output | Enables interleaved dual-phase operation with second MP2908A for reduced input/output ripple and higher total power. |
| SENSE− (Pin 14) | Negative current sense input | High-side or low-side current sense return; used with SENSE+ to detect inductor current for cycle-by-cycle limiting. |
| SENSE+ (Pin 15) | Positive current sense input | Differential input referenced to SENSE−; common-mode range 0–24V supports high-side sensing in buck configurations. |
| PGND (Pin 16) | Power ground return | High-current return for bottom gate driver and VCC1 regulator; must connect directly to VCC1 capacitor negative terminal. |
| BG (Pin 17) | Bottom gate driver output | Drives gate of synchronous N-MOSFET; 1Ω pull-down and 3Ω pull-up ensure fast turn-off and robust noise immunity. |
| SW (Pin 18) | Switch node | Connection point between HS-FET drain and LS-FET source; serves as return for BST capacitor and high-current path. |
| TG (Pin 19) | Top gate driver output | Bootstrapped floating driver for HS-N-MOSFET; powered by BST capacitor; 2Ω pull-up and 1Ω pull-down support fast switching. |
| BST (Pin 20) | Bootstrap supply input | Connects to BST capacitor (BST–SW); internal diode charges capacitor from VCC1 during LS-FET conduction phase. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable AAM/CCM mode selection | Reduces light-load quiescent current to 250–350µA while maintaining regulation, extending battery runtime in always-on systems. |
| Precision 0.8V reference with ±1.5% tolerance | Ensures <±1.2% output voltage error across full temperature and line range without trimming or calibration. |
| 180° SYNCO output for dual-phase interleaving | Enables two MP2908AGF-P controllers to operate in phase opposition, cutting input/output ripple current by up to 50%. |
| Three-level programmable current limit | Eliminates need for external current-sense amplifiers; supports 25/50/75mV thresholds matching standard shunt resistor values. |
| Integrated VCC1 LDO with VCC2 bypass option | Lowers thermal stress by allowing VCC1 to be powered from an efficient secondary rail (e.g., 5V buck output), not VIN. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Supply |
|---|---|
|
Use Scenario: Regulating 12V battery input to stable 5V/3.3V rails for microcontrollers, CAN transceivers, and sensors under cold-crank (VIN down to 4.5V). IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current DC/DC conversion with cycle-by-cycle current limiting and thermal fault response. Use Value: 99.5% max duty cycle maintains regulation during cranking; AAM mode cuts no-load current to <350µA, reducing parasitic drain on vehicle battery. |
Use Scenario: Generating isolated 24V-to-15V intermediate rail for I/O modules in factory automation systems with wide ambient temperature variation. IC Role / Device Role / Timing Role: High-voltage step-down controller driving discrete N-MOSFETs, synchronized to system clock to avoid EMI interference with analog signal chains. Use Value: External sync capability (100–1000kHz) enables deterministic noise placement; OVP/OCP/thermal shutdown meet IEC 61000-6-4 immunity requirements. |
| Telecom Remote Radio Head (RRH) | Medical Imaging Power Subsystem |
|
Use Scenario: Converting 48V backplane supply to 12V for RF power amplifiers in outdoor base stations operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Current-mode controller with programmable frequency and 180° SYNCO output enabling dual-phase operation for lower ripple and higher power density. Use Value: Dual-phase interleaving reduces input capacitor RMS current by ~30%, extending lifetime in high-reliability telecom deployments. |
Use Scenario: Providing tightly regulated ±15V and +5V rails for analog front-end circuits in portable ultrasound devices with strict low-noise and low-EMI requirements. IC Role / Device Role / Timing Role: Synchronous buck controller operating in forced CCM mode to eliminate subharmonic oscillation and maintain clean spectral profile near sensitive ADCs. Use Value: Fixed-frequency CCM operation (via CCM/AAM = VCC1) prevents beat frequencies with imaging clocks; PG output validates rail integrity before data acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PWPR | Wider 6–100V input range; requires external bootstrap diode; no integrated VCC2 bypass option; 1.22V FB reference. | Preferred for >60V industrial inputs; lacks AAM mode, resulting in higher light-load current (~1.2mA vs. 250µA). | Choose LM5116PWPR only if input exceeds 60V or if TI ecosystem integration is required. |
| RT7297CZSP | 4–60V input; fixed 500kHz frequency; no external sync; single current limit (50mV); no SYNCO output. | Suitable for cost-sensitive, fixed-frequency designs where dual-phase operation is unnecessary. | Select RT7297CZSP when design simplicity and BOM count reduction outweigh flexibility needs. |
Compared with LM5116PWPR and RT7297CZSP, the MP2908AGF-P uniquely combines AAM efficiency optimization, dual-phase SYNCO capability, three-level current limit selection, and VCC2-powered bias - making it optimal for thermally constrained, multi-rail automotive and industrial systems demanding both flexibility and reliability.
Availability
MP2908AGF-P is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC power supplies, telecom remote radio heads, and medical imaging subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP2908AGF-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 mixed-signal ICs for power management, motion control, and interface applications.
The MP2908A product line delivers high-voltage synchronous buck controllers optimized for automotive, industrial, and telecom applications requiring wide input range, high efficiency across load conditions, and robust fault protection.
FAQ
What is the minimum input voltage required for reliable startup?
The MP2908AGF-P features an input UVLO with a rising threshold of 4.5V and falling threshold of 3.7V. Reliable startup occurs when VIN rises above 4.5V; operation continues down to 3.7V before shutdown. This 800mV hysteresis prevents chatter during brownout conditions.
How does the AAM mode reduce light-load power consumption?
AAM mode disables constant-frequency PWM and enters variable-frequency operation when the COMP voltage falls below the CCM/AAM pin voltage (≥480mV). This eliminates switching losses at very low loads, reducing quiescent current to 250–350µA versus ~750µA in forced CCM.
Can MP2908AGF-P drive high-side and low-side MOSFETs with different RDS(on) values?
Yes - the TG and BG drivers are independently optimized: TG has 2Ω pull-up/1Ω pull-down, BG has 3Ω pull-up/1Ω pull-down. This asymmetry accommodates typical high-side MOSFETs with higher gate charge and lower RDS(on) than low-side devices.
What is the purpose of the SYNCO pin and how is it used?
SYNCO outputs a 180° phase-shifted clock signal synchronized to the internal oscillator. When cascading two MP2908AGF-P controllers, connecting SYNCO of Controller 1 to EN/SYNC of Controller 2 enables interleaved dual-phase operation, halving input/output ripple current and improving thermal distribution.
How is over-voltage protection triggered and what happens afterward?
OVP activates when FB exceeds 110–120% of 0.8V (i.e., 0.88–0.96V). The controller immediately disables the high-side MOSFET and turns on the low-side MOSFET to discharge the output. It remains in this "discharge mode" until FB falls below the OVP threshold, then resumes normal regulation.
Is external bootstrap diode required for the BST pin?
No - the MP2908AGF-P integrates a bootstrap charging diode from VCC1 to BST. A ceramic capacitor (typically 0.1µF) must be placed between BST and SW; no external diode is needed, simplifying layout and improving reliability.
What thermal derating applies to the TSSOP-20-EP package?
With θJA = 40°C/W on a 4-layer PCB per JESD51-7, the TSSOP-20-EP package dissipates up to 3.1W at 25°C ambient. At 85°C ambient, maximum allowable power drops to ~1.7W. Use the exposed pad and thermal vias to maintain TJ ≤ 125°C in continuous operation.
MP2908AGF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 100kHz ~ 1MHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Dead Time Control, Enable, Frequency Control, Power Good, Soft Start, Sync
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
MP2908AGF-P FAQ
1.How can I place an order for MP2908AGF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2908AGF-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 MP2908AGF-P reliable?
The price and inventory of MP2908AGF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2908AGF-P is usually 5 days.
3.What payment methods are accepted for MP2908AGF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2908AGF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2908AGF-P?
MP2908AGF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2908AGF-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 MP2908AGF-P?
For technical support, including MP2908AGF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2908AGF-P requirements.
6.How does Aetrix verify that MP2908AGF-P is sourced from the original manufacturer or authorized distributors?
All MP2908AGF-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 MP2908AGF-P meets industry standards.
7.What is the process for return or replacement of MP2908AGF-P?
All MP2908AGF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2908AGF-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 MP2908AGF-P part is unused and in its original packaging.
Return procedure for MP2908AGF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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