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Monolithic Power Systems Inc. MP3435GL-Z
- Part No.:
- MP3435GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MP3435GL-Z.pdf
- Description:
- IC REG BOOST ADJ 19A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,613
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Product details
Overview
MP3435GL-Z from Monolithic Power Systems is a 600kHz synchronous boost converter with integrated 10mΩ low-side and 15mΩ high-side MOSFETs, supporting 3V–20V input and up to 22V output, featuring input disconnect, configurable input average current limit, and thermal shutdown at 150°C - deployed in power banks and Thunderbolt interfaces requiring regulated high-voltage rail generation from single-cell Li-ion sources.
For engineers reviewing the MP3435GL-Z datasheet, MP3435GL-Z pinout, MP3435GL-Z application, or MP3435GL-Z equivalent, key selection criteria include its 19A internal switch current limit, QFN-20 (3mm×4mm) package thermal performance (θJA = 27°C/W), input disconnect functionality for battery preservation, and external compensation for transient optimization across wide load ranges.
Technical Context
The MP3435GL-Z implements fixed-frequency peak-current-mode control with dual sensing paths: internal current sense (GATE grounded) enabling 19A cycle-by-cycle limiting, or external resistor-based average current regulation (GATE floating) with 45–63mV VCL threshold. Its bootstrap circuit powers the HS-FET driver from SOUT, requiring careful BST capacitor and optional Schottky diode design when duty cycle falls below ~50%.
It integrates three protection layers: linear charge OCP with 0.5ms blanking for startup, hiccup-mode SCP triggered by >100mV/RSENSE overcurrent, and input disconnect via GATE-driven external MOSFET that isolates VIN from VOUT during shutdown or short-circuit - all coordinated through analog COMP voltage regulation and SS-controlled soft-start ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching frequency | 600kHz ±15% - enables compact 1.5µH inductor and low-profile ceramic output capacitors without audible noise. |
| Input voltage range | 3V to 20V - supports direct connection to single-cell (3.3V–4.2V) and multi-cell Li-ion, USB PD, or industrial 12V rails. |
| Output voltage range | VIN to 22V - programmable via FB resistor divider; 1.225V reference enables precise 5V, 9V, 12V, or 20V output setting. |
| Internal switch RDS(on) | 10mΩ (LS-FET), 15mΩ (HS-FET) - minimizes conduction loss at 19A peak, sustaining >90% efficiency at 2A load with 3.3V input. |
| Input average current limit | Configurable 45–63mV sense threshold - sets precise input current cap (e.g., 10A with 5mΩ RSENSE) independent of output load. |
| Shutdown current | <1µA - preserves battery life in always-on portable systems during deep sleep or standby modes. |
| Thermal shutdown | 150°C with 25°C hysteresis - prevents permanent damage under sustained overload while allowing recovery after cooling. |
Pinout & Package
MP3435GL-Z is housed in a thermally enhanced QFN-20 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (Pin 11/12/13/14/15/16/17/18/19/20 PGND/AGND/OUT/IN/VDD/COMP/FB/SS/SOUT/BST). The package supports ≤4.6W continuous power dissipation at TA = 25°C and requires PCB copper pour under the thermal pad for optimal θJA = 27°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 OUT | Power output node | Connects to HS-FET drain and output filter; carries full load current - requires low-inductance routing and ≥3×22µF local capacitance. |
| 4 BST | Bootstrap supply | Powers HS-FET gate driver; must be decoupled with 0.1µF ceramic between BST and SW - failsafe operation requires Schottky clamp if VOUT/VIN < 1.8. |
| 5 SOUT | Output voltage sampling | Sources BST charge current and powers VDD once VOUT > VIN; connects to SOUT pin of external inductor MPL-AY1050 series. |
| 6 EN | Enable control | Logic-level on/off with 1.33V turn-on threshold; configures VIN UVLO hysteresis - never leave floating; use 100kΩ pull-up if VIN > 5.5V. |
| 7 GATE | Input disconnect MOSFET driver | Drives external N-channel MOSFET gate; grounding selects internal current sense; floating enables external RSENSE-based average current regulation. |
| 8 SENSE | Current sense input | Measures voltage drop across external RSENSE; tie to IN for internal sensing - determines accuracy of input current limit (±10% typical). |
| 9,20 SW | Switch node | Connects to inductor and LS-FET drain; high dV/dt node - requires tight layout, guard ring, and minimal trace length to reduce EMI. |
| 11 IN | Main input supply | Bypass with ≥2.2µF ceramic near pin; supports 3–20V; feeds VDD during startup before SOUT takeover. |
| 12 VDD | Internal bias supply | Must be decoupled with 2.2µF ceramic; powered from IN initially, then from SOUT - critical for gate drive stability. |
| 13 COMP | Loop compensation | External RC network sets crossover frequency and phase margin; enables optimization for fast transient response with 25mA load step. |
| 14 FB | Feedback input | 1.225V reference comparator input; resistor divider from VOUT sets output voltage - 1% tolerance resistors recommended. |
| 15 SS | Soft-start control | Charged by 7µA current; CSS value sets ramp time - 100nF yields ~14ms start-up; open for immediate enable. |
| 16 AGND | Analog ground | Separate from PGND; connects to FB, COMP, SS, SENSE - must tie to PGND at single point near IC to avoid noise coupling. |
| 3,10,17,18,19 PGND | Power ground | High-current return path for SW, OUT, IN, VDD; requires solid copper plane and multiple vias to thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Input disconnect function | Active GATE driver isolates VIN from VOUT during shutdown or output short, preventing battery drain in portable devices. |
| Configurable input average current limit | 45–63mV VCL threshold enables precise input current capping (e.g., 5A max with 10mΩ RSENSE) for USB compliance or thermal management. |
| Integrated 10mΩ/15mΩ MOSFETs | Eliminates external power switches, reduces BOM count by ≥4 components, and maintains >92% efficiency at 3.3V→12V/2A conversion. |
| External compensation (COMP) | Enables loop tuning for optimal transient response across input/output combinations - validated with MPS MPL-AY1050-1R5 inductor. |
| Thermal shutdown with hysteresis | 150°C trip + 25°C hysteresis ensures safe recovery without oscillation; protects against sustained overload in enclosed enclosures. |
Applications
| Thunderbolt Interfaces | Notebooks and Tablets |
|---|---|
|
Use Scenario: Providing stable 20V auxiliary rail for Thunderbolt 3/4 host controllers and active cables from 3.3V–4.2V battery source. IC Role / Device Role / Timing Role: Synchronous boost regulator with input disconnect ensures clean power sequencing and prevents backfeed during hot-plug events. Use Value: Enables single-cell Li-ion operation without external DC-DC staging; 600kHz switching avoids interference with 10GHz+ Thunderbolt signaling. |
Use Scenario: Generating 12V system rail for display backlight drivers and SSD power from shared battery bus in ultra-thin notebooks. IC Role / Device Role / Timing Role: High-efficiency boost converter with soft-start and light-load pulse-skipping maintains efficiency across 10µA–2A load range. Use Value: Reduces thermal footprint vs. discrete solutions; QFN-20 package fits <10mm² board area - critical for fanless tablet designs. |
| Power Banks | Point-of-Sale (POS) Systems |
|
Use Scenario: Delivering 9V/12V USB PD output from 3.7V Li-ion cell while preserving battery capacity during idle periods. IC Role / Device Role / Timing Role: Input disconnect and <1µA shutdown current eliminate parasitic drain, extending shelf life beyond 6 months. Use Value: Eliminates need for external load switch; integrated current limit ensures safe charging of downstream USB-C accessories. |
Use Scenario: Powering 12V thermal printers and EMV card readers from 5V USB or 12V wall adapter in compact retail terminals. IC Role / Device Role / Timing Role: Wide 3–20V input accepts variable input sources; robust SCP and OVP protect against printer motor stall faults. Use Value: Single-chip solution replaces legacy boost + LDO + protection IC stack - reduces failure points and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT4801BZQW | 400kHz switching, 12A switch limit, no input disconnect, 2.7–16V input | Lacks GATE-driven input isolation - unsuitable for battery-depletion-critical applications like power banks | Select when cost sensitivity outweighs input disconnect requirement and 12A peak suffices |
| TPS61088RHLR | 2.7–12V input, 12V max output, 10A switch, no configurable input current limit | Fixed 12V output ceiling and no VCL programming - cannot support 20V Thunderbolt or POS printer rails | Prefer for 5V→12V fixed-rail designs where 10A peak meets load demand and thermal budget allows larger package |
Compared with RT4801BZQW and TPS61088RHLR, MP3435GL-Z uniquely delivers 22V output capability, programmable input current limiting, and hardware-enforced input disconnect - making it the only option among the three qualified for USB PD sink applications requiring battery isolation and >15V output.
Availability
MP3435GL-Z is available at Aetrix Electronics and suitable for power banks, Thunderbolt interfaces, and Point-of-Sale systems requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MP3435GL-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 power management ICs, with over 20 years of expertise in DC-DC conversion, motor drivers, and LED lighting controllers.
The MP3435 belongs to MPS's high-current synchronous boost product line, designed specifically for portable and interface-powered systems needing compact, efficient, and fault-resilient voltage step-up from low-voltage batteries or USB sources.
FAQ
What is the minimum input voltage required for MP3435GL-Z to start switching?
The MP3435GL-Z begins switching when input voltage exceeds the rising UVLO threshold of 2.68V (typical), with 250mV hysteresis. Below 2.6V, the device remains in shutdown regardless of EN state. Startup is guaranteed down to 3V per datasheet operating conditions, and the internal regulator powers VDD from IN until SOUT takes over once VOUT exceeds VIN.
Can MP3435GL-Z operate without an external inductor?
No - MP3435GL-Z requires an external power inductor connected between SW and VIN. The device does not integrate magnetic components. MPS recommends the MPL-AY1050-1R5 (1.5µH, 22A saturation) for optimal efficiency and thermal performance; inductor DCR must be ≤5mΩ to maintain accuracy of internal current sensing.
How does the input disconnect function behave during output short-circuit?
When an output short occurs, the MP3435GL-Z triggers hiccup-mode SCP and pulls GATE low within microseconds, turning off the external input MOSFET and fully isolating VIN from VOUT. This prevents reverse current flow and limits input current to leakage levels (<1µA), protecting both battery and upstream source.
Is the FB reference voltage trimmed across temperature?
Yes - the FB reference voltage is 1.225V (typical) with ±12mV variation over –40°C to +125°C junction temperature, corresponding to ±1% accuracy. This is specified in the Electrical Characteristics table and validated across production lots; no external calibration is needed for standard 12V output designs.
What is the maximum allowable RSENSE value when using external current sensing?
Maximum RSENSE is 10mΩ, derived from the 45–63mV VCL range and 5A maximum input current requirement. At 63mV/10mΩ = 6.3A, the device remains within specification; higher values degrade current limit accuracy and increase power loss. For 10A input limit, use ≤6.3mΩ RSENSE.
Does MP3435GL-Z support forced PWM mode at light loads?
No - MP3435GL-Z automatically transitions from fixed-frequency PWM to frequency foldback and then pulse-skipping mode (PSM) as load decreases. There is no pin or register to force continuous conduction mode; PSM reduces quiescent current to ~150µA and eliminates low-frequency beat tones in audio-sensitive applications.
MP3435GL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 22V
- Current - Output:
- 19A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
MP3435GL-Z FAQ
1.How can I place an order for MP3435GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3435GL-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 MP3435GL-Z reliable?
The price and inventory of MP3435GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3435GL-Z is usually 5 days.
3.What payment methods are accepted for MP3435GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3435GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3435GL-Z?
MP3435GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3435GL-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 MP3435GL-Z?
For technical support, including MP3435GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3435GL-Z requirements.
6.How does Aetrix verify that MP3435GL-Z is sourced from the original manufacturer or authorized distributors?
All MP3435GL-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 MP3435GL-Z meets industry standards.
7.What is the process for return or replacement of MP3435GL-Z?
All MP3435GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3435GL-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 MP3435GL-Z part is unused and in its original packaging.
Return procedure for MP3435GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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