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Monolithic Power Systems Inc. MP2908AGF-Z
- Part No.:
- MP2908AGF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MP2908AGF-Z.pdf
- Description:
- IC REG BUCK ADJUSTABLE 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,405
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Product details
Overview
MP2908AGF-Z from Monolithic Power Systems is a 4V–60V input, current-mode synchronous step-down controller that drives dual N-channel MOSFETs in high-voltage DC/DC conversion. It features programmable switching frequency (100–1000 kHz), 0.8V ±1.5% reference accuracy, and advanced asynchronous mode (AAM) for light-load efficiency optimization-used in automotive power systems requiring cold-crank operation down to 4V.
For engineers reviewing the MP2908AGF-Z datasheet, MP2908AGF-Z pinout, MP2908AGF-Z application, or MP2908AGF-Z equivalent, key selection criteria include its dual-gate drive capability, BST-supplied floating top gate driver, precision OVP/OCP protection, and support for external sync clock in noise-sensitive industrial control designs.
Technical Context
The MP2908AGF-Z implements peak-current-mode control with cycle-by-cycle current limiting and slope compensation, enabling stable regulation across wide VIN and load ranges. Its error amplifier delivers 70 dB open-loop DC gain and 500 µS transconductance, interfacing with an external RC network on COMP for loop stability tuning.
It integrates dual independent gate drivers: TG supports 99.5% max duty cycle with 92 ns minimum on-time and 2 Ω pull-up resistance, while BG provides 175–250 ns minimum on-time and 1 Ω pull-down resistance. The bootstrap (BST) supply is self-charged via internal diode from VCC1 to SW, with UVLO at 3.05V (170 mV hysteresis) ensuring reliable high-side FET operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports automotive cold-crank (down to 4V) and industrial 48V bus systems |
| Feedback Reference | 0.800 V ±1.5% - enables precise output regulation with minimal drift over temperature |
| Switching Frequency | 100 kHz to 1000 kHz - programmable via external resistor or synchronizable to external clock for EMI reduction |
| Current Limit Threshold | 25 mV / 50 mV / 75 mV - selectable via ILIM pin connection (GND/VCC1/floating) for accurate peak inductor current setting |
| Power Good Accuracy | ±10% of VREF - PG output asserts low when output deviates beyond 85–96.5% rising or 81–92.5% falling thresholds |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects die during overload or poor PCB thermal design |
| OVP Threshold | 110–120% of VFB - triggers discharge mode (LS-FET on) to rapidly clamp overvoltage events |
Pinout & Package
MP2908AGF-Z is packaged in TSSOP-20-EP (exposed pad), optimized for thermal dissipation in high-power density applications. Pin functions are validated per Monolithic Power Systems' official datasheet Rev. 1.01.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Main input supply rail | Accepts 4V–60V; requires local ceramic decoupling to suppress high-frequency transients |
| EN/SYNC (Pin 2) | Enable and synchronization input | 1.22V enable threshold with 140 mV hysteresis; doubles as external clock input (100–1000 kHz) |
| VCC2 (Pin 3) | External bias supply for VCC1 regulator | Enables higher-efficiency VCC1 sourcing from secondary rail (4.5–12V); reduces VIN power loss |
| VCC1 (Pin 4) | Internal bias supply output | 5V regulated output powering gate drivers and core logic; requires 1–4.7 µF ceramic decoupling |
| SGND (Pin 5) | Signal ground reference | Low-noise analog ground tied to output capacitor negative terminal to minimize sensing errors |
| SS (Pin 6) | Soft-start timing control | Charged by 4 µA internal current source; sets ramp time via external capacitor to prevent output overshoot |
| COMP (Pin 7) | Error amplifier compensation node | Interface for external RC network to stabilize control loop against load/transient variations |
| FB (Pin 8) | Output voltage feedback input | Compares divider output to 0.8V reference; determines regulated output voltage (VOUT = 0.8 × (1 + R1/R2)) |
| CCM/AAM (Pin 9) | Conduction mode selection | Configures CCM (floating/VCC1) or AAM (GND-connected) for light-load efficiency optimization |
| FREQ (Pin 10) | Frequency programming input | Resistor-to-GND sets oscillator frequency; also accepts external sync signal when EN/SYNC is used for sync |
| PG (Pin 11) | Power good open-drain output | Indicates ±10% output regulation status; requires external pull-up (e.g., 100 kΩ to ≤5V) |
| ILIM (Pin 12) | Current limit threshold select | Three fixed sense voltages (25/50/75 mV) set peak inductor current limit without external components |
| SYNCO (Pin 13) | 180° out-of-phase clock output | Enables interleaved dual-phase operation when cascading multiple MP2908A controllers |
| SENSE− (Pin 14) | Negative current sense input | Differential input paired with SENSE+; rejects common-mode noise on high-side current sensing |
| SENSE+ (Pin 15) | Positive current sense input | Connects to shunt resistor high side; enables accurate valley or peak current sensing |
| PGND (Pin 16) | Power ground return | High-current return path for bottom gate driver and VCC1 regulator; must connect directly to VCC1 cap |
| BG (Pin 17) | Bottom gate driver output | Drives synchronous N-MOSFET source; 1 Ω pull-down ensures fast turn-off and prevents shoot-through |
| SW (Pin 18) | Switch node | High dv/dt node connecting inductor, HS-FET drain, LS-FET source, and BST capacitor |
| TG (Pin 19) | Top gate driver output | Bootstrap-powered floating driver for HS-FET gate; 2 Ω pull-up enables fast turn-on under high-duty conditions |
| BST (Pin 20) | Bootstrap supply input | Charged via internal diode from VCC1 to SW; requires 0.1 µF ceramic capacitor to SW for stable HS drive |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Light-Load Mode | AAM enables non-synchronous operation below VAAM threshold (e.g., 480 mV), reducing switching losses at <10% load |
| High-Duty-Cycle Operation | 99.5% max duty cycle with low-dropout mode extends regulation into automotive cold-crank (VIN = 4.5V, VOUT = 3.3V) |
| Dual Independent Gate Drivers | TG and BG drivers feature matched dead-time (60 ns) and asymmetric drive strengths (2 Ω up / 1 Ω down) for robust MOSFET control |
| Integrated Protection Suite | OVP (110–120% VFB), OCP (programmable 25/50/75 mV), thermal shutdown (170°C), and hiccup-mode short-circuit recovery |
| Flexible Power Supply Options | VCC1 can be sourced from VIN (4.5–60V) or external VCC2 (4.5–12V), improving system efficiency and thermal performance |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supplies 5V/3.3V rails to MCU, display, and audio codecs in head units operating across 6–16V battery range with cold-crank dips to 4V. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current DC/DC conversion with AAM for standby power savings. Use Value: 99.5% duty cycle and low dropout operation maintain regulation during engine start; OVP/OCP protect downstream SoCs from transient faults. | Use Scenario: Generates isolated 12V/5V supplies for digital I/O, analog sensor interfaces, and communication ICs in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: High-voltage controller stepping down 24V/48V industrial bus to intermediate rails with external sync to avoid EMI coupling into analog sections. Use Value: 100–1000 kHz sync capability eliminates beat frequencies; PG output enables system-level power sequencing and fault reporting. |
| Telecom Remote Radio Unit | EV Onboard Charger Auxiliary Supply |
Use Scenario: Powers FPGA, ADCs, and RF front-end bias in outdoor RRUs exposed to 48V PoE-derived input with wide ambient temperature swings. IC Role / Device Role / Timing Role: Current-mode controller delivering stable 1.2V/1.8V/3.3V outputs with precision 0.8V reference and thermal shutdown for unattended operation. Use Value: ±1.5% reference accuracy ensures consistent ADC full-scale and FPGA core voltage; 125°C junction rating supports extended temperature deployment. | Use Scenario: Provides auxiliary 12V rail for gate drivers, MCU, and isolation ICs in bidirectional OBCs accepting 200–450V DC input. IC Role / Device Role / Timing Role: High-input-voltage buck controller operating from OBC's intermediate 60V rail, synchronized to main converter clock to reduce conducted emissions. Use Value: SYNCO output enables phase interleaving with secondary controller; BST UVLO ensures reliable HS-FET drive despite high dv/dt noise in power stage. |
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 |
|---|---|---|---|
| MPQ2908AGL-A | QFN-20 (3×4 mm) package with wettable flanks; identical electrical specs and pinout except for thermal pad layout | Better thermal performance in space-constrained layouts; requires re-optimized PCB land pattern and solder profile | Select for new designs prioritizing thermal dissipation and automated optical inspection (AOI) compatibility |
| LM5116PWPR | TI part with 6–100V input, no integrated VCC2 option, fixed 5V VCC regulator, and different current-sense architecture (high-side only) | Lacks AAM mode and programmable ILIM; requires external bootstrap diode and separate VCC biasing | Choose only if legacy LM5116 design reuse is required; not drop-in due to pinout, protection, and feature differences |
Compared with MP2908AGF-Z, MPQ2908AGL-A offers superior thermal resistance (θJC = 10°C/W vs. 8°C/W) but demands QFN-specific assembly; LM5116PWPR lacks AAM, VCC2 flexibility, and differential current sensing-requiring additional components and sacrificing light-load efficiency.
Availability
MP2908AGF-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply across extended temperature and high-reliability environments.
Supply support for MP2908AGF-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 global design centers and AEC-Q100-qualified product lines.
The MP2908A series belongs to MPS's high-voltage DC/DC controller product line, engineered for automotive and industrial applications demanding wide input range, robust protection, and flexible conduction-mode control.
FAQ
What is the maximum allowable input voltage for MP2908AGF-Z?
The absolute maximum input voltage (VIN) is 65V, but the recommended operating range is 4V to 60V. Exceeding 60V risks violating safe operating area limits and may trigger internal protection circuits. The 65V rating accounts for transient spikes; sustained operation above 60V is not guaranteed and voids reliability specifications.
How does the AAM mode improve efficiency at light loads?
AAM reduces switching frequency dynamically when the COMP voltage falls below the CCM/AAM pin voltage (e.g., 480 mV), entering non-synchronous operation. This eliminates reverse recovery losses in the low-side MOSFET and lowers gate drive losses, achieving >85% efficiency at 10 mA load-unattainable in forced CCM mode.
Can MP2908AGF-Z operate without an external VCC2 supply?
Yes. When VCC2 is left open or biased below 4.5V, the internal VCC1 regulator derives power from VIN. However, using VCC2 (4.5–12V) reduces power dissipation in the VIN-to-VCC1 LDO, improves overall system efficiency by up to 2%, and lowers thermal stress on the IC package.
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. It enables interleaved operation of two MP2908AGF-Z controllers to halve input/output ripple current and reduce EMI. No external components are needed-connect SYNCO of master to FREQ of slave for automatic phase alignment.
How is over-current protection implemented and what happens during a short circuit?
OCP uses cycle-by-cycle peak current limiting based on the SENSE+/SENSE− differential voltage. During a hard short, the controller enters hiccup mode: it shuts down for ~10 ms, then attempts restart. Average short-circuit current is limited to ~1.5× rated current, preventing thermal runaway and enabling safe fault clearing without external circuitry.
Is MP2908AGF-Z qualified for automotive applications?
MP2908AGF-Z is not AEC-Q100 qualified in this specific grade; however, it meets critical automotive requirements including -40°C to +125°C operating junction temperature, 4V cold-crank support, and robust OVP/OCP/thermal protection. For production automotive use, consult MPS for AEC-Q100-certified variants such as MPQ2908AGL-A.
What is the minimum external SS capacitor value for stable soft-start?
No minimum capacitor is specified, but typical values range from 10 nF to 100 nF. With the internal 4 µA charge current and 0.8V reference, a 47 nF capacitor yields ~9.4 ms soft-start time. Smaller capacitors (<10 nF) risk insufficient ramp time, causing output overshoot; larger values (>220 nF) unnecessarily extend startup without benefit.
MP2908AGF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-Z FAQ
1.How can I place an order for MP2908AGF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2908AGF-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 MP2908AGF-Z reliable?
The price and inventory of MP2908AGF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2908AGF-Z is usually 5 days.
3.What payment methods are accepted for MP2908AGF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2908AGF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2908AGF-Z?
MP2908AGF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2908AGF-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 MP2908AGF-Z?
For technical support, including MP2908AGF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2908AGF-Z requirements.
6.How does Aetrix verify that MP2908AGF-Z is sourced from the original manufacturer or authorized distributors?
All MP2908AGF-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 MP2908AGF-Z meets industry standards.
7.What is the process for return or replacement of MP2908AGF-Z?
All MP2908AGF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2908AGF-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 MP2908AGF-Z part is unused and in its original packaging.
Return procedure for MP2908AGF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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