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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Monolithic Power Systems Inc. MP3910AGS-Z

Name: MP3910AGS-Z
Brand: Monolithic Power Systems Inc.
SKU: MP3910AGS-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP3910AGS-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: DC DC Switching Controllers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MP3910AGS-Z.pdf

Description:: PEAK CURRENT MODE BOOST PWM CONT

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP3910AGS-Z from Monolithic Power Systems is a peak current mode PWM controller for external N-channel MOSFETs in flyback, boost, forward, and SEPIC topologies. It delivers 1A gate drive, supports 30–400kHz programmable switching frequency, features pulse-skipping light-load operation, and integrates cycle-by-cycle current limit, OVP, SCP, OLP hiccup protection, and external soft-start-enabling high-efficiency telecom isolated supplies and PoE-powered devices.

For engineers reviewing the MP3910AGS-Z datasheet, MP3910AGS-Z pinout, MP3910AGS-Z application, or MP3910AGS-Z equivalent, key selection criteria include its SOIC-8 package compatibility, 9–14V VCC range, 185mV current-sense threshold, 0.95V pulse-skip trigger, and dual feedback mode (FB/COMP) auto-detection via ISENSE pin voltage.

Technical Context

The MP3910AGS-Z implements a peak current mode control architecture with integrated slope compensation, enabling stable loop compensation and inherent cycle-by-cycle current limiting. Its programmable oscillator uses an external RT-to-GND resistor to set frequency between 30kHz and 400kHz, with maximum operating frequency rated at 500kHz.

Feedback configuration is dynamically selected at startup via ISENSE pin: a ≥185mV detection enables COMP-pin direct feedback (for isolated flyback), while <185mV enables internal error amplifier operation with FB-pin sensing (for non-isolated boost). Soft-start and hiccup-mode protections are coordinated through SS pin voltage ramping (54μA charge) and controlled discharge (17.8μA/1.66μA) based on OLP/OVP/SCP events.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	9V to 14V - powers internal circuitry; UVLO rising threshold at 8V with 650mV hysteresis ensures reliable enable/disable sequencing.
Gate Drive Strength	1A sourcing/sinking - minimizes MOSFET switching losses and supports wide selection of standard-threshold N-channel devices.
Switching Frequency	30kHz to 400kHz (programmable via RT resistor) - balances EMI, efficiency, and magnetics size across telecom and industrial power designs.
Current Sense Threshold	185mV typical - sets cycle-by-cycle peak current limit; enables precise overcurrent response without external amplification.
Pulse-Skip Threshold	0.95V on COMP pin - triggers light-load efficiency mode by pausing PWM cycles, reducing gate drive and switching losses below ~10% load.
Soft-Start Charge Current	54μA - controls ramp rate of SS capacitor voltage to manage inrush current and prevent output overshoot during startup and fault recovery.
OVP Reference	1.438V typical on FB pin - detects overvoltage in non-isolated applications or auxiliary winding voltage in isolated flyback configurations.
Thermal Shutdown	160°C with 20°C hysteresis - protects die from thermal runaway; automatic recovery after cooldown avoids latch-off behavior.

Pinout & Package

MP3910AGS-Z is housed in a standard SOIC-8 package with exposed pad (not thermally enhanced per datasheet), suitable for surface-mount assembly and compatible with JEDEC MS-012AC footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Power ground reference	Return path for gate driver and internal bias circuits; must be low-impedance connection to minimize noise coupling into current sense path.
2 RT	Frequency programming input	Connects external resistor to GND to set oscillator frequency; value determines switching frequency per f_SW ≈ 2.35×10³/R_T (R_T in kΩ, f_SW in kHz).
3 COMP	Error amplifier output / isolated feedback input	Drives compensation network in non-isolated mode; accepts optocoupler signal directly in isolated mode when ISENSE detects ≥185mV.
4 FB	Voltage feedback / OVP monitor	Connects to resistive divider for output regulation in boost; monitors auxiliary winding voltage for OVP in flyback; internal 1.237V reference enables precision regulation.
5 SS	Soft-start and protection timer	Controls COMP voltage ramp during startup/fault recovery; charged at 54μA, discharged at 17.8μA (OLP) or 1.66μA (SCP/OVP) to implement hiccup-mode restart logic.
6 ISENSE	Current sense input / topology detection	Senses voltage across external shunt for peak current control; outputs 55μA pulse at startup to auto-detect isolated vs. non-isolated configuration based on reflected voltage level.
7 VCC	Supply input	Accepts 9–14V DC; requires local bypass capacitor; clamping required if input exceeds 14V to prevent damage.
8 GATE	MOSFET gate driver output	1A push-pull driver for N-channel power MOSFET; low impedance (4.1Ω sourcing / 2Ω sinking) reduces gate charge time and conduction loss.

Key Features

Feature	Design Value
Dual feedback topology auto-detection	ISENSE pin voltage (≥185mV or <185mV) configures FB or COMP as primary feedback path at power-up-eliminates manual jumper or external logic.
Hiccup-mode OLP/SCP/OVP protection	SS pin discharge currents (17.8μA for OLP, 1.66μA for SCP/OVP) and 0.2V restart threshold enforce safe, self-recovering fault handling without external latching circuitry.
Programmable frequency with noise-immune RT interface	RT pin accepts 6.81kΩ–80.6kΩ resistor to set 30–400kHz; design guidance limits max R_T to maintain robustness against EMI-induced jitter.
Pulse-skipping light-load optimization	COMP voltage monitoring below 0.95V disables PWM clock pulses-reducing quiescent current to ~400μA and eliminating switching losses at no/low load.
Integrated slope compensation	On-chip ramp generator prevents subharmonic oscillation in duty cycles >50%, enabling stable operation without external components in boost/flyback designs.

Applications

Telecom Isolated Power Supplies

Brick Modules

Use Scenario: 48V input telecom rectifier feeding isolated 12V/24V secondary rails with tight regulation and high reliability.

IC Role / Device Role / Timing Role: Primary-side PWM controller regulating flyback transformer via optocoupler feedback to COMP pin; manages 250kHz switching and hiccup-mode OVP/SCP response.

Use Value: Auto-detected isolated mode eliminates need for external mode-select resistors; 160°C thermal shutdown prevents field failures under sustained overload.

Use Scenario: Compact 1/4-brick DC-DC module converting 24V–60V input to 5V/3.3V outputs for server backplanes.

IC Role / Device Role / Timing Role: Boost controller driving high-current N-MOSFET in non-isolated step-up stage; configured via FB pin with 1.237V reference for ±1% output accuracy.

Use Value: 1A gate drive supports fast-switching SiC MOSFETs; pulse-skipping extends no-load efficiency to >85%, meeting Energy Star requirements.

Off-line Controller

PoE Powered Devices

Use Scenario: Universal-input (85–265VAC) offline flyback adapter for consumer electronics with <300mW standby power.

IC Role / Device Role / Timing Role: Primary-side controller using auxiliary winding feedback to FB pin; leverages UVLO (8V) and 400μA quiescent current for low-power start-up and hold-up.

Use Value: External soft-start (SS pin) prevents inrush into bulk capacitor; leading-edge blanking (214ns) rejects MOSFET turn-on spikes during current sensing.

Use Scenario: IEEE 802.3af/at powered device (PD) accepting 37–57V DC input and generating regulated 12V/5V rails for VoIP phones or wireless APs.

IC Role / Device Role / Timing Role: Secondary-side boost controller stepping up midspan PSE output to higher intermediate bus; operates in SEPIC mode for input dropout tolerance.

Use Value: Programmable frequency (30–400kHz) allows EMI tuning around PoE data band; OLP hiccup mode prevents thermal damage during cable fault conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar peak current mode PWM controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28083DR	Fixed 100kHz/200kHz frequency; no programmable RT; lower gate drive (0.5A); no pulse-skipping mode.	Designed for cost-sensitive AC-DC adapters; lacks light-load efficiency optimization and dual-feedback auto-detection.	Select UCC28083DR only for fixed-frequency, non-isolated boost where BOM count reduction outweighs efficiency and flexibility trade-offs.
NCP1252ADR2G	Fixed 65kHz frequency; 0.5A gate drive; no soft-start pin-relies on VCC ramp; no hiccup-mode OLP.	Targeted at low-cost offline flyback; missing programmable frequency, pulse-skip, and SS-controlled protection timing.	Choose NCP1252ADR2G for simple, low-power flyback where thermal derating and fault recovery are managed externally.

Compared with UCC28083DR and NCP1252ADR2G, MP3910AGS-Z provides superior design flexibility through RT-programmable frequency, true hiccup-mode protection with SS-timed recovery, and automatic topology detection-reducing validation effort and component count in multi-platform power designs.

Availability

MP3910AGS-Z is available at Aetrix Electronics and suitable for telecom isolated power supplies, brick modules, off-line controllers, and PoE powered devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3910AGS-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, and global manufacturing partnerships.

The MP3910A belongs to MPS's high-voltage PWM controller product line, engineered for flexible, efficient, and robust DC-DC conversion in isolated and non-isolated topologies-targeting telecom infrastructure, industrial power, and connected edge devices.

FAQ

What is the minimum recommended RT resistor value for stable operation?

The datasheet specifies a minimum RT value of 6.81kΩ for 308–363kHz operation. Using a lower resistance risks excessive oscillator current, increased jitter, and reduced noise immunity. For designs targeting >300kHz, RT = 6.81kΩ is validated; values below 5.6kΩ are not characterized and may compromise cycle-by-cycle current limit accuracy due to timing skew.

How does the ISENSE pin determine isolated vs. non-isolated mode?

At power-up, the MP3910AGS-Z applies a 55μA current pulse to ISENSE for 180μs. If the resulting voltage exceeds 185mV (indicating optocoupler pull-up in isolated flyback), it disables the internal error amplifier and enables COMP-pin feedback. If voltage remains below 185mV (as in direct FB-divider connection), it enables FB-based regulation with internal EA active.

Can MP3910AGS-Z drive a 600V MOSFET in a 400V boost application?

Yes-the MP3910AGS-Z itself has no drain voltage rating; it drives external MOSFETs. A 600V-rated N-channel MOSFET is appropriate for 400V boost output, provided V_DS(MAX) ≥ 1.5 × V_OUT (i.e., ≥600V) to absorb turn-off voltage spikes. Gate drive capability (1A) and 14V VCC limit require proper gate resistor selection to avoid shoot-through and ensure clean transitions.

What causes the SS pin voltage to drop to 0.2V during hiccup mode?

During SCP or OVP, the MP3910AGS-Z activates a 1.66μA discharge current on the SS pin. When SS voltage falls to 0.2V, the controller resets its protection latch and initiates a new soft-start cycle-charging SS again at 54μA. This 0.2V threshold ensures full internal reset before re-enabling gate drive, preventing premature restart under persistent fault.

Is the 1.237V FB reference voltage trimmed across temperature?

Yes-the FB reference is specified as 1.211V to 1.258V over –40°C to +125°C, with typical 1.237V at 25°C. This ±1.3% total variation ensures ≤±1.5% output regulation error in well-designed feedback networks, making it suitable for applications requiring tight DC accuracy without post-regulation.

Does pulse-skipping mode affect transient response?

No-pulse-skipping only pauses PWM cycles when COMP voltage falls below 0.95V; regulation remains active via the error amplifier. During load steps, COMP voltage rises immediately, exiting skip mode within one cycle. Transient recovery is preserved because the control loop (EA + COMP) stays fully operational-unlike burst-mode controllers that disable internal bias.

What is the purpose of the 214ns leading-edge blanking on ISENSE?

The 214–398ns leading-edge blanking (LEB) disables current sensing during MOSFET turn-on to ignore gate-drive-induced voltage spikes and transformer leakage ringing. This prevents false OCP triggering while maintaining accurate cycle-by-cycle current limiting during steady-state conduction-critical for stable operation in high-dV/dt flyback designs.

MP3910AGS-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: PWM Signal

Function:: Step-Up

Output Configuration:: Positive

Topology:: Boost

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 9V ~ 14V

Frequency - Switching:: 30kHz ~ 400kHz

Duty Cycle (Max):: 95%

Synchronous Rectifier:: No

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Current Limit, Frequency Control, Soft Start

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

MP3910AGS-Z FAQ

1.How can I place an order for MP3910AGS-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP3910AGS-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 MP3910AGS-Z reliable?

The price and inventory of MP3910AGS-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3910AGS-Z is usually 5 days.

3.What payment methods are accepted for MP3910AGS-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3910AGS-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP3910AGS-Z?

MP3910AGS-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP3910AGS-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 MP3910AGS-Z?

For technical support, including MP3910AGS-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3910AGS-Z requirements.

6.How does Aetrix verify that MP3910AGS-Z is sourced from the original manufacturer or authorized distributors?

All MP3910AGS-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 MP3910AGS-Z meets industry standards.

7.What is the process for return or replacement of MP3910AGS-Z?

All MP3910AGS-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3910AGS-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 MP3910AGS-Z part is unused and in its original packaging.

Return procedure for MP3910AGS-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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