My Inquiry
My Account
Texas Instruments LMR61428XMMX/NOPB
- Part No.:
- LMR61428XMMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMR61428XMMX/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.85A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR61428XMMX/NOPB from Texas Instruments is a step-up DC-DC switching regulator with 1.2V–14V input range, adjustable output up to 14V, 2.85A internal switch current, 70% fixed duty cycle, and VSSOP-8 package. It delivers up to 90% efficiency in space-constrained battery-powered systems such as portable displays and LED drivers.
For engineers reviewing the LMR61428XMMX/NOPB datasheet, LMR61428XMMX/NOPB pinout, LMR61428XMMX/NOPB application, or LMR61428XMMX/NOPB equivalent, key selection criteria include its gated-oscillator control scheme, bootstrapped VDD operation, cycle-by-cycle current limiting, and 300 kHz–2 MHz programmable switching frequency for compact magnetics.
Technical Context
The LMR61428XMMX/NOPB uses a constant-duty-cycle gated oscillator topology with 70% typical duty cycle and hysteresis-based regulation (30–45 mV at FB), enabling ultra-low quiescent current (80 µA operating, <2.5 µA shutdown) and high efficiency across wide load ranges. Its internal 0.17 Ω N-channel MOSFET switch and integrated thermal protection support robust boost conversion without external current-sense circuitry.
Operation begins at 1.1 V input and sustains regulation down to 0.65 V via bootstrapped VDD supply; FREQ pin allows resistor-programmable switching frequency between 300 kHz and 2 MHz, directly determining inductor and capacitor sizing for minimal solution footprint. The device requires no external compensation due to its hysteresis-controlled open-loop architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2 V to 14 V - supports single-cell Li-ion, NiMH, and multi-cell alkaline/battery stacks without pre-regulation. |
| Output Voltage Range | 1.24 V to 14 V - set via external resistive divider; limited by 70% max duty cycle (VOUT/VIN ≤ 3.3). |
| Switch Current Limit | 2.85 A typical - enables ≥500 mA output at 5 V from 2.5 V input with margin for transient loads. |
| Efficiency | 87% at VIN=3.6 V, VOUT=5 V, IOUT=0.5 A - achieved via BiCMOS process and low-RDS(on) 0.17 Ω internal MOSFET. |
| Quiescent Current | 80 µA operating, <2.5 µA shutdown - extends battery life in standby and low-power display/LED modes. |
| Switching Frequency | Programmable 300 kHz–2 MHz via FREQ–VDD resistor - allows use of sub-10 µH shielded inductors and <100 µF ceramic output caps. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and portable consumer environments with thermal shutdown at ~160°C. |
Pinout & Package
VSSOP-8 (DGK) package, 3.0 mm × 5.0 mm × 1.09 mm height, exposed thermal pad, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | High-current return path for internal MOSFET and output diode; must connect to low-impedance ground plane under IC. |
| 2 EN | Active-Low Enable | Pull below 0.15×VDD to disable; pull above 0.7×VDD to enable; controls full shutdown with <2.5 µA total current draw. |
| 3 FREQ | Frequency Set | Resistor-to-VDD sets oscillator frequency; determines inductor/capacitor size and EMI profile (300 kHz–2 MHz). |
| 4 FB | Feedback Input | Monitors output via resistive divider; 1.24 V reference with 30–45 mV hysteresis defines regulation window for gated-oscillator control. |
| 5 SGND | Signal Ground | Reference for FB, EN, and FREQ; isolated from PGND to prevent noise coupling into feedback path. |
| 6 VDD | Bias Supply | Accepts 2.5–5 V; bootstrapped from VOUT when 2.5–5 V available, else supplied externally for non-standard VOUT. |
| 7 BOOT | Bootstrap Capacitor Node | Drives gate of internal N-MOSFET; requires 10–22 nF ceramic cap between BOOT and SW for proper high-side drive. |
| 8 SW | Switch Node | Drain of internal MOSFET; connects to inductor and output diode anode; high dv/dt node requiring short, direct routing. |
Key Features
| Feature | Design Value |
|---|---|
| Gated Oscillator Control | Eliminates need for error amplifier and compensation network; reduces BOM count and layout sensitivity while maintaining ±5% output regulation. |
| Integrated 0.17 Ω N-MOSFET | Enables self-contained boost design with no external power switch; reduces conduction loss and PCB area vs discrete solutions. |
| Low-Voltage Start-Up | Starts from 1.1 V input and sustains regulation down to 0.65 V - supports deep-discharge battery operation in handheld devices. |
| Thermal & Current Protection | Auto-recovering thermal shutdown (~160°C trip) and cycle-by-cycle peak current limit (2.85 A) prevent damage during overload or poor heatsinking. |
| VSSOP-8 with Exposed Pad | 1.09 mm max height and 3.0 × 5.0 mm footprint enable ultra-thin designs; exposed pad improves thermal resistance (θJA = 240°C/W). |
Applications
| Portable LCD Bias Supply | White LED Driver |
|---|---|
Use Scenario: Powering TFT-LCD panel bias rails (AVDD, VGH, VGL) from single 3.3 V or 5 V rail in smartphones and tablets. IC Role / Device Role / Timing Role: Step-up regulator generating 12–14 V outputs with tight ripple tolerance and fast transient response to backlight dimming commands. Use Value: Achieves >85% efficiency at 100–300 mA loads while fitting within 12 mm² board area using 6.8 µH shielded inductor and 68 µF tantalum output cap. | Use Scenario: Driving parallel strings of white LEDs in portable medical devices or barcode scanners requiring stable current and low EMI. IC Role / Device Role / Timing Role: Constant-voltage boost source feeding external LED current regulators; supports PWM dimming via EN pin modulation. Use Value: Delivers 5 V @ 500 mA with <20 mVpp ripple at 1 MHz switching, minimizing conducted noise near sensitive analog sensors. |
| USB-Powered Portable Instrumentation | Low-Profile Industrial Sensor Node |
Use Scenario: Generating 5 V or 9 V from USB 5 V input for microcontroller peripherals, op-amps, or RF modules in handheld test equipment. IC Role / Device Role / Timing Role: Compact, efficient boost converter replacing linear regulators to avoid thermal derating and extend runtime on USB battery packs. Use Value: Reduces solution size by 60% vs comparable 5 V–9 V boost modules; operates continuously at 85°C ambient with no forced air. | Use Scenario: Powering 3.3 V logic and 5 V analog sections in sealed, fanless sensor enclosures powered by 2xAA or coin cells. IC Role / Device Role / Timing Role: Primary voltage translator enabling operation from 1.8–2.8 V battery sources while maintaining regulated outputs during deep discharge. Use Value: Maintains regulation down to 0.65 V input and draws only 80 µA quiescent current - extends shelf life beyond 2 years in sleep mode. |
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-A switch current, 2.7–12 V input, synchronous rectification, 500 kHz–2.2 MHz programmable frequency. | Supports higher output power (>3 W) and tighter line/load regulation; requires external compensation. | Choose for >1 A continuous output or tighter regulation; larger solution size and higher BOM cost. |
| MAX17222ETA+ | Lower 1.2-A switch current, 0.4–5.5 V input, 1.8–5.25 V fixed outputs, 1.2 MHz fixed frequency, 0.9 µA shutdown IQ. | Optimized for ultra-low-power microcontroller supply; no adjustable output or frequency programming. | Choose for sub-100 mA loads and <1 µA shutdown; not suitable for >5 V outputs or variable VOUT. |
Compared with TPS61088RHLR and MAX17222ETA+, the LMR61428XMMX/NOPB offers balanced performance for 0.2–0.8 A boost applications: lower cost than TPS61088, wider input/output flexibility than MAX17222, and proven reliability in consumer display/LED systems without external compensation complexity.
Availability
LMR61428XMMX/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, LCD bias supplies, white LED drivers, and low-profile sensor nodes requiring stable component supply and long-term manufacturability.
Supply support for LMR61428XMMX/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 ICs, with over 50 years of innovation in energy-efficient power conversion.
The LMR61428XMMX/NOPB belongs to TI's SIMPLE SWITCHER® family-designed specifically for easy-to-use, high-efficiency DC-DC conversion in battery-powered and space-constrained applications where minimal external components and fast time-to-market are critical.
FAQ
What is the minimum input voltage required for LMR61428XMMX/NOPB to start switching?
The LMR61428XMMX/NOPB starts switching from as low as 1.1 V input under no-load conditions. Once started, it remains operational down to 0.65 V input by bootstrapping VDD from the output. This capability supports deep-discharge battery operation in portable electronics where input voltage drops significantly during use.
How does the gated oscillator control scheme in LMR61428XMMX/NOPB differ from standard PWM regulation?
The LMR61428XMMX/NOPB uses a hysteresis-based gated oscillator instead of traditional PWM. It switches continuously at fixed 70% duty cycle until output reaches upper threshold, then stops entirely until output falls to lower threshold. This eliminates error amplifier and compensation network, reducing quiescent current to 80 µA and improving light-load efficiency versus PWM.
Can LMR61428XMMX/NOPB generate a 12 V output from a 3.3 V input?
Yes - the LMR61428XMMX/NOPB can generate 12 V from 3.3 V input. With a 70% max duty cycle, the theoretical boost ratio is VOUT/VIN ≤ 1/(1−0.7) ≈ 3.3, so 3.3 V × 3.3 ≈ 10.9 V. In practice, accounting for diode drop and losses, 12 V is achievable with careful layout and low-loss components, as confirmed in TI's typical application circuits.
What is the purpose of the BOOT pin on LMR61428XMMX/NOPB, and how should it be connected?
The BOOT pin provides gate drive voltage for the internal N-channel MOSFET. It must be connected to a 10–22 nF ceramic capacitor between BOOT and SW pins. This capacitor charges during the off-time and supplies the gate voltage during on-time, enabling full enhancement of the high-side switch without external charge pump circuitry.
Is LMR61428XMMX/NOPB pin-compatible with other members of the LMR614xx family?
Yes - LMR61428XMMX/NOPB shares identical VSSOP-8 (DGK) pinout and function mapping with LMR61422 and LMR61430 variants. Differences lie in switch current rating (2.85 A vs 2.2 A vs 3.0 A) and internal current limit, but PCB layout, feedback network, and external component selection remain interchangeable for most designs.
LMR61428XMMX/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
LMR61428XMMX/NOPB FAQ
1.How can I place an order for LMR61428XMMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR61428XMMX/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 LMR61428XMMX/NOPB reliable?
The price and inventory of LMR61428XMMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR61428XMMX/NOPB is usually 5 days.
3.What payment methods are accepted for LMR61428XMMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR61428XMMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR61428XMMX/NOPB?
LMR61428XMMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR61428XMMX/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 LMR61428XMMX/NOPB?
For technical support, including LMR61428XMMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR61428XMMX/NOPB requirements.
6.How does Aetrix verify that LMR61428XMMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR61428XMMX/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 LMR61428XMMX/NOPB meets industry standards.
7.What is the process for return or replacement of LMR61428XMMX/NOPB?
All LMR61428XMMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR61428XMMX/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 LMR61428XMMX/NOPB part is unused and in its original packaging.
Return procedure for LMR61428XMMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR61428XMMX/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
