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Monolithic Power Systems Inc. MP2908AGF
- Part No.:
- MP2908AGF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP2908AGF.pdf
- Description:
- IC REG BUCK ADJUSTABLE 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
MP2908AGF 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 cold-crank DC/DC converters and industrial 24V/48V power supplies.
For engineers reviewing the MP2908AGF datasheet, MP2908AGF pinout, MP2908AGF application, or MP2908AGF equivalent, key selection criteria include its dual-MOSFET gate drive capability, AAM/CCM mode selectability, precision OVP/OCP protection thresholds, and TSSOP-20-EP package thermal performance for high-input-voltage buck controllers.
Technical Context
The MP2908AGF implements peak-current-mode control with slope compensation, cycle-by-cycle current limiting, and asynchronous mode (AAM) triggered by COMP voltage crossing a programmable VAAM threshold derived from FREQ resistor value. Its error amplifier delivers 70dB open-loop DC gain and 500μS transconductance to stabilize wide-input-voltage regulation loops.
It integrates dual gate drivers with 2Ω TG pull-up, 1Ω TG pull-down, 3Ω BG pull-up, and 1Ω BG pull-down, plus bootstrap UVLO (3.05V rising, 170mV hysteresis) and low-dropout operation enabling >99% duty cycle during automotive cold-crank conditions where VIN may dip below VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports automotive battery (9–16V), industrial 24V/48V rails, and cold-crank down to 4.5V UVLO rising threshold. |
| Feedback Reference | 0.800V ±1.5% - enables precise output regulation across -40°C to +125°C junction temperature range. |
| Switching Frequency | 100kHz–1000kHz programmable via FREQ resistor - allows EMI optimization and inductor size trade-off. |
| Current Limit Threshold | 25mV / 50mV / 75mV selectable via ILIM pin - sets peak inductor current limit without external sense resistor scaling. |
| Power Good Accuracy | ±3.5% VFB window (85–96.5% rising, 81–92.5% falling) - provides reliable system power sequencing and fault detection. |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects die during overload or poor PCB thermal design while enabling automatic recovery. |
| Gate Driver Dead Time | 60ns - prevents shoot-through in high-side/low-side N-MOSFET pairs under all load and temperature conditions. |
Pinout & Package
TSSOP-20-EP package with exposed thermal pad; 0.65mm pitch, 6.5mm × 4.4mm body; requires solder paste stencil aperture matching JEDEC MO-153 for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main input supply connection | Accepts 4–60V; requires local ceramic bypass capacitor to suppress high-frequency switching noise and input ripple. |
| EN/SYNC (Pin 2) | Enable input / external clock sync | 1.22V enable threshold with 140mV hysteresis; doubles as 100–1000kHz sync input for EMI reduction in multi-rail systems. |
| VCC2 (Pin 3) | External bias supply input | Enables VCC1 regulation from external source (4.5–12V), reducing dissipation when VIN is high (e.g., 48V input). |
| VCC1 (Pin 4) | Internal bias rail output | 5V regulated output powering gate drivers and analog circuitry; decoupled with 1–4.7μF ceramic capacitor. |
| SGND (Pin 5) | Signal ground reference | Low-noise return for FB, COMP, SS; must be routed separately from PGND to avoid control loop instability. |
| SS (Pin 6) | Soft-start timing node | Charged by internal 4μA current source; external capacitor sets ramp time to prevent output overshoot at startup. |
| COMP (Pin 7) | Error amplifier output | Connects to RC compensation network; determines loop stability, transient response, and phase margin of buck regulator. |
| FB (Pin 8) | Output voltage feedback input | Compares divider output to 0.8V reference; sets regulated output voltage (e.g., 5V = 0.8V × (R1+R2)/R2). |
| CCM/AAM (Pin 9) | Mode selection control | Logic level selects continuous conduction (CCM) or advanced asynchronous mode (AAM); AAM improves light-load efficiency. |
| FREQ (Pin 10) | Frequency programming node | Resistor to GND sets switching frequency; also defines AAM threshold voltage via IAAM × RAAM relationship. |
| PG (Pin 11) | Open-drain power-good indicator | Pulled low if VOUT deviates >±10% from target; 25μs delay ensures stable regulation before assertion. |
| ILIM (Pin 12) | Current limit configuration | Three states: GND = 25mV, VCC1 = 50mV, float = 75mV - configures peak inductor current limit without external components. |
| SYNCO (Pin 13) | 180° out-of-phase clock output | Enables interleaved dual-phase operation with second MP2908AGF for reduced input/output ripple and higher total power. |
| SENSE− (Pin 14) | Negative current sense input | High-side or low-side current sensing node; differential pair with SENSE+ detects inductor current for cycle-by-cycle limiting. |
| SENSE+ (Pin 15) | Positive current sense input | Paired with SENSE−; common-mode range 0–24V supports high-side sensing in buck topologies with floating sources. |
| PGND (Pin 16) | Power ground return | High-current return path 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 ensures fast turn-off and prevents shoot-through during dead time. |
| SW (Pin 18) | Switch node | Connection point between HS-FET drain and LS-FET source; referenced for BST capacitor and high-frequency AC return path. |
| TG (Pin 19) | Top gate driver output | Bootstrapped floating driver for HS-N-MOSFET; 2Ω pull-up enables fast turn-on even at high duty cycles. |
| BST (Pin 20) | Bootstrap supply input | Charged via diode from VCC1 to SW; maintains >3.05V for HS-FET drive; UVLO disables TG if BST falls below threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Dual N-MOSFET gate drive | Integrated 2Ω TG pull-up / 1Ω TG pull-down and 3Ω BG pull-up / 1Ω BG pull-down drivers eliminate need for external drivers in high-efficiency buck designs. |
| Programmable AAM/CCM mode | Selectable light-load efficiency optimization: AAM reduces switching losses at <10% load; CCM ensures fixed-frequency EMI profile under full load. |
| 180° SYNCO output | Enables seamless interleaving with second MP2908AGF for 2-phase operation-halving input/output ripple current and doubling effective switching frequency. |
| Three-level current limit | ILIM pin selects 25mV/50mV/75mV sense thresholds-configuring peak current without external resistors or calibration, simplifying BOM and layout. |
| Pre-bias start-up support | Blocks TG/BG activation until SS > FB, preventing reverse current flow into pre-biased outputs-critical for hot-swap and redundant power systems. |
| Automotive-grade thermal protection | 170°C shutdown with 20°C hysteresis ensures robust operation in engine bay environments while enabling automatic recovery after cooling. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 5V/3.3V rails for head-unit processors, display drivers, and CAN transceivers from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 12V→5V; manages AAM-to-CCM transition during audio playback vs. standby. Use Value: 99.5% max duty cycle sustains 5V output during 4.5V cold-crank; 0.8V ±1.5% reference ensures SoC core voltage stability across temperature. |
Use Scenario: Generating isolated 24V→12V/5V supplies for analog input conditioning, digital I/O, and communication interfaces in factory automation. IC Role / Device Role / Timing Role: High-reliability step-down controller with OVP/OCP/thermal shutdown protecting downstream FPGA and ADCs. Use Value: Precision 10% PG window enables safe system boot sequencing; 60V abs max rating accommodates 48V industrial bus transients. |
| Telecom Remote Radio Unit (RRU) | EV Onboard Charger Auxiliary Supply |
|
Use Scenario: Converting 48V telecom rectifier output to 12V for RF amplifiers and baseband processors in outdoor macro cells. IC Role / Device Role / Timing Role: EMI-sensitive buck controller synchronized to system clock via EN/SYNC pin to avoid interference with LTE/5G bands. Use Value: 100–1000kHz sync range aligns switching harmonics away from critical RF bands; QFN/TSSOP packages support compact thermal layout. |
Use Scenario: Providing 12V auxiliary power for MCU, gate drivers, and sensors in bidirectional OBCs operating from 200–450V DC link. IC Role / Device Role / Timing Role: Input-stage buck controller stepping down intermediate 48V rail to 12V; handles wide VIN variation during charging/discharging cycles. Use Value: 4–60V input range covers entire OBC auxiliary rail envelope; 180° SYNCO supports dual-phase design for >10A output with low ripple. |
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 | Wide-input (6–100V), but uses voltage-mode control; no integrated AAM; requires external current sense amplifier. | Lacks programmable light-load efficiency mode; less suitable for battery-powered or thermally constrained telecom applications. | Choose LM5116 when absolute max VIN > 60V is required and AAM is not needed; verify loop compensation for voltage-mode stability. |
| ISL8113IRZ | 4–60V input, dual-phase capable, but only supports forced CCM; no AAM; higher quiescent current (1.2mA vs. 0.75mA typical). | Higher light-load power loss; no valley current limit option; lacks pre-bias start-up support for redundant systems. | Prefer ISL8113 for high-power dual-phase designs where fixed-frequency operation and high channel count outweigh efficiency trade-offs. |
Compared with LM5116PWPR and ISL8113IRZ, the MP2908AGF uniquely combines AAM for sub-100mW light-load operation, three-level current limit configurability, and pre-bias start-up-making it optimal for automotive and industrial systems requiring cold-crank resilience and flexible power management.
Availability
MP2908AGF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP2908AGF 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 two decades of leadership in DC/DC conversion, motor drivers, and LED lighting solutions.
The MP2908A product line targets high-input-voltage synchronous buck controllers for automotive, industrial, and telecom applications-designed specifically to address cold-crank, wide VIN, and EMI-sensitive requirements in harsh environments.
FAQ
What is the maximum duty cycle supported by MP2908AGF?
The MP2908AGF supports up to 99.5% maximum duty cycle, enabled by low-dropout operation where the high-side MOSFET remains on continuously when BST–SW voltage exceeds 3.05V. This capability ensures regulation during automotive cold-crank events where input voltage drops near output voltage.
How does the AAM mode improve light-load efficiency?
AAM mode reduces switching frequency dynamically when load decreases: once COMP voltage falls below the programmable VAAM threshold (set by FREQ resistor), the internal oscillator resets on each COMP–VAAM crossover, extending off-time and minimizing gate drive and switching losses below ~10% load.
Can MP2908AGF operate with an external 5V bias instead of VIN-derived VCC1?
Yes-connecting a 4.5–12V external supply to VCC2 disables the VIN-to-VCC1 LDO and powers VCC1 directly from that source. This reduces power dissipation and improves efficiency, especially when VIN exceeds 24V, and is commonly used with a downstream converter's 5V or 12V rail.
What protection features are integrated into MP2908AGF?
MP2908AGF integrates precision output over-voltage protection (OVP) triggering at 110–120% VFB, cycle-by-cycle over-current protection (OCP) with hiccup-mode recovery, thermal shutdown at 170°C, input UVLO (4.5V rising), and bootstrap UVLO (3.05V rising) - all with defined hysteresis for reliable fault handling.
Is MP2908AGF pin-compatible with other MPS buck controllers?
No-MP2908AGF has a unique 20-pin TSSOP-EP footprint and pinout optimized for dual-MOSFET drive, current sensing, and AAM/CCM control. It is not pin-compatible with MP2307, MP2494, or MPQ4312; layout and schematic must be designed specifically for its signal routing and thermal pad requirements.
How is the soft-start time calculated for MP2908AGF?
Soft-start time tSS is determined by tSS = (CSS × 0.8V) / 4μA, where CSS is the external capacitor from SS to SGND. For example, a 100nF capacitor yields ~20ms ramp time; the internal 4μA current source charges SS linearly from 0V to 1.2V before handing control back to the 0.8V reference.
Does MP2908AGF support pre-bias start-up?
Yes-MP2908AGF monitors SS versus FB at startup. If FB > SS (indicating pre-biased output), TG and BG remain disabled until SS rises above FB, preventing reverse current flow into the output capacitor and avoiding potential damage to downstream loads or parallel regulators.
MP2908AGF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Adjustable
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- -
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 1MHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
MP2908AGF FAQ
1.How can I place an order for MP2908AGF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2908AGF 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 reliable?
The price and inventory of MP2908AGF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2908AGF is usually 5 days.
3.What payment methods are accepted for MP2908AGF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2908AGF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2908AGF?
MP2908AGF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2908AGF 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?
For technical support, including MP2908AGF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2908AGF requirements.
6.How does Aetrix verify that MP2908AGF is sourced from the original manufacturer or authorized distributors?
All MP2908AGF 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 meets industry standards.
7.What is the process for return or replacement of MP2908AGF?
All MP2908AGF units undergo pre-shipment inspection (PSI). If there is an issue with MP2908AGF, 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 part is unused and in its original packaging.
Return procedure for MP2908AGF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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