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Texas Instruments LMR61428XMM/NOPB
- Part No.:
- LMR61428XMM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMR61428XMM/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.85A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,798
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Product details
Overview
LMR61428XMM/NOPB from Texas Instruments is a step-up DC-DC switching regulator with integrated 0.17Ω N-channel MOSFET, supporting 1.2V–14V input and adjustable output up to 14V, delivering up to 2.85A peak switch current at up to 2MHz switching frequency, optimized for battery-powered LCD displays and LED biasing.
For engineers reviewing the LMR61428XMM/NOPB datasheet, LMR61428XMM/NOPB pinout, LMR61428XMM/NOPB application, or LMR61428XMM/NOPB equivalent, key selection criteria include minimum start-up voltage (1.1V), gated-oscillator efficiency profile, VSSOP-8 thermal performance, and bootstrapped VDD operation in low-profile portable systems.
Technical Context
The LMR61428XMM/NOPB employs a constant-duty-cycle gated oscillator topology with fixed 70% duty cycle, enabling ultra-low quiescent current (80µA operating, <2.5µA shutdown) and high efficiency across wide load ranges. Its hysteresis-based regulation uses a 30–45mV window at the FB pin to control burst-mode switching.
Internal protection includes cycle-by-cycle peak current limiting (2.85A typical), thermal shutdown (~160°C), and bootstrapped gate drive via BOOT pin. VDD must be supplied between 2.5V–5V, either from VOUT (for 2.5–5V outputs) or an external source, while SW pin tolerates up to 14.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 14V; starts reliably from 1.1V, operates down to 0.65V after startup - enables single-cell Li-ion or NiMH battery use. |
| Output Voltage Range | Adjustable 1.24V to 14V via resistor divider; limited by 70% max duty cycle (VOUT/VIN ≤ 3.3). |
| Switch Current Limit | 2.85A typical peak; protects against overload and short-circuit during transient conditions. |
| Switching Frequency | Programmable 300kHz–2MHz via FREQ-to-VDD resistor; supports compact 6.8µH shielded inductors. |
| Efficiency | 87% at VIN=3.6V, VOUT=5V, IOUT=0.5A; >80% across 0.04–0.54A load range for 3.3V output. |
| Quiescent Current | 80µA typical operating; <2.5µA shutdown - extends battery life in standby and display-off modes. |
| FB Reference Voltage | 1.24V ±3.5%; sets output accuracy and ripple sensitivity in hysteresis control loop. |
Pinout & Package
VSSOP-8 package (DGK), 3.0 mm × 5.0 mm × 1.09 mm height, exposed thermal pad, RoHS-compliant tin (Sn) lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power Ground | High-current return path for MOSFET switch; must connect directly to power ground plane near IC. |
| EN (Pin 2) | Active-Low Enable | Pulled below 0.15×VDD to disable; pulls internal circuitry into sub-2.5µA shutdown state. |
| FREQ (Pin 3) | Frequency Set | Resistor to VDD programs switching frequency; determines inductor/capacitor size and EMI profile. |
| FB (Pin 4) | Voltage Feedback | Monitors resistive divider output; 1.24V reference triggers hysteresis-based gated-oscillator control. |
| SGND (Pin 5) | Signal Ground | Low-noise reference for FB, EN, FREQ; isolated from PGND to prevent feedback corruption. |
| VDD (Pin 6) | Bias Supply Input | 2.5–5V supply for internal logic; can be bootstrapped from VOUT (2.5–5V) or sourced externally. |
| BOOT (Pin 7) | Bootstrap Capacitor Node | Drives high-side gate of internal MOSFET; requires 10–22nF ceramic capacitor to SW and VDD. |
| SW (Pin 8) | Switch Node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode; swings from PGND to VOUT+0.4V. |
Key Features
| Feature | Design Value |
|---|---|
| Gated Oscillator Topology | Eliminates PWM controller complexity; achieves 80µA IQ and >87% efficiency at light loads without external compensation. |
| Integrated 0.17Ω N-MOSFET | Reduces BOM count and layout area; eliminates external switch selection and gate driver design effort. |
| Adjustable 2.5–5V VDD Bootstrapping | Enables self-powered operation from regulated output, simplifying power sequencing in single-rail systems. |
| Thermal Shutdown & Cycle-by-Cycle Limit | Protects against sustained overloads and PCB overheating without external sensing components. |
| VSSOP-8 with Exposed Pad | Provides 240°C/W θJA; supports >500mW power dissipation at TA=25°C with minimal copper area. |
Applications
| Portable LCD Backlight | White LED Driver |
|---|---|
Use Scenario: Boosting single-cell Li-ion (2.8–4.2V) to 5–12V for edge-lit TFT LCD panels in handheld medical devices. IC Role / Device Role / Timing Role: Primary step-up regulator supplying constant-voltage backlight rail with dynamic dimming via EN pin PWM. Use Value: 87% efficiency at 0.5A ensures >10-hour runtime; VSSOP-8 footprint fits tight bezel space constraints. | Use Scenario: Driving 3–6 series white LEDs from 3.3V system rail in industrial status indicators and barcode scanners. IC Role / Device Role / Timing Role: Constant-voltage boost converter with analog/digital dimming support via FB divider scaling. Use Value: 2.85A switch current headroom accommodates LED forward voltage drift; 1.1V start-up enables operation during brown-out. |
| Low-Power IoT Sensor Node | USB-Powered Peripheral |
Use Scenario: Generating 5V/3.3V rails from coin-cell (1.5–3.0V) or energy-harvesting sources in wireless sensor transceivers. IC Role / Device Role / Timing Role: Ultra-low-IQ boost regulator enabling multi-year battery life; EN pin used for MCU-controlled sleep/wake cycling. Use Value: <2.5µA shutdown current minimizes leakage; gated-oscillator maintains >70% efficiency even at 20mA load. | Use Scenario: Up-converting 5V USB input to 9V or 12V for legacy analog audio codecs or op-amp biasing in portable DACs. IC Role / Device Role / Timing Role: Compact, no-compensation boost stage replacing discrete inductor-diode-cap solutions. Use Value: 2MHz programmability allows 2.2µH inductor; total solution size < 80mm² including all passives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5A switch current, 2.5V–12V input, requires external compensation; 16-pin QFN vs VSSOP-8. | Supports higher output power (>10W); less suitable for space-constrained 1–2W LCD/LED apps. | Choose when >3A output or tighter output regulation (±1%) is required; accept larger layout and compensation effort. |
| MT3608EN | Lower cost, 2A switch current, fixed 1.2MHz, no FREQ adjust or thermal shutdown; SOT-23-6 package. | Limited to <1.5W continuous; lacks shutdown IQ spec and robust protection features. | Choose for cost-sensitive, non-critical consumer lighting where 2.85A headroom and 1.1V start-up are unnecessary. |
Compared with TPS61088RHLR and MT3608EN, the LMR61428XMM/NOPB uniquely balances ultra-low start-up voltage (1.1V), VSSOP-8 compactness, gated-oscillator efficiency at microamp loads, and integrated protection - making it optimal for battery-powered displays and LED systems under 3W.
Availability
LMR61428XMM/NOPB is available at Aetrix Electronics and suitable for portable medical displays, industrial LED signage, IoT sensor nodes, and USB-powered peripherals requiring stable component supply and long-term manufacturability.
Supply support for LMR61428XMM/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in DC-DC conversion and high-reliability power solutions.
The LMR61428XMM/NOPB belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use, minimal external component count, and robust performance in space- and battery-constrained portable electronics.
FAQ
What is the minimum input voltage required for LMR61428XMM/NOPB to start regulation?
The LMR61428XMM/NOPB starts regulation from as low as 1.1V input (typical), enabling operation from nearly depleted single-cell batteries. Once started, it continues regulating down to 0.65V input by bootstrapping VDD from the output. This behavior is confirmed in the Electrical Characteristics table under VIN_ST and VIN_OP parameters.
Can LMR61428XMM/NOPB generate a 12V output from a 3.3V input?
Yes, the LMR61428XMM/NOPB can generate 12V from 3.3V input, since VOUT/VIN = 12/3.3 ≈ 3.6, which exceeds the device's maximum boost ratio of ~3.3 (1/(1−0.7)). In practice, regulation will be lost at light loads; full 12V output requires ≥4.0V input. The datasheet specifies VOUT_MAX = 14V but constrains usable range by duty cycle limits.
How does the FREQ pin on LMR61428XMM/NOPB affect design?
The FREQ pin on LMR61428XMM/NOPB sets switching frequency from 300kHz to 2MHz using an external resistor to VDD. Higher frequencies allow smaller inductors (e.g., 2.2µH at 2MHz vs 6.8µH at 500kHz) and reduce output ripple frequency, but increase switching losses. The choice directly impacts solution size, EMI filtering, and thermal design.
Is an external Schottky diode required for LMR61428XMM/NOPB operation?
Yes, an external Schottky diode is mandatory - the LMR61428XMM/NOPB integrates only the N-channel MOSFET switch, not the catch diode. A fast-recovery Schottky (e.g., MBRS140T3) with reverse voltage rating > VOUT and forward current > IOUT is required. Omitting it causes catastrophic failure due to lack of current path during MOSFET off-time.
What is the role of the BOOT pin in LMR61428XMM/NOPB?
BOOT pin on LMR61428XMM/NOPB supplies the gate drive voltage for the internal N-MOSFET. It requires a 10–22nF ceramic capacitor between BOOT and SW pins to generate ~VOUT + 5V gate-source voltage. Incorrect BOOT capacitor placement or value causes weak turn-on, excessive conduction loss, and thermal shutdown - verified in the "BOOTSTRAPPING" section of the datasheet.
LMR61428XMM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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):
- 1.2V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 2.85A (Switch)
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LMR61428XMM/NOPB FAQ
1.How can I place an order for LMR61428XMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR61428XMM/NOPB 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 LMR61428XMM/NOPB reliable?
The price and inventory of LMR61428XMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR61428XMM/NOPB is usually 5 days.
3.What payment methods are accepted for LMR61428XMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR61428XMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR61428XMM/NOPB?
LMR61428XMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR61428XMM/NOPB 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 LMR61428XMM/NOPB?
For technical support, including LMR61428XMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR61428XMM/NOPB requirements.
6.How does Aetrix verify that LMR61428XMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR61428XMM/NOPB 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 LMR61428XMM/NOPB meets industry standards.
7.What is the process for return or replacement of LMR61428XMM/NOPB?
All LMR61428XMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR61428XMM/NOPB, 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 LMR61428XMM/NOPB part is unused and in its original packaging.
Return procedure for LMR61428XMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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