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Texas Instruments LM3524DMX/NOPB
- Part No.:
- LM3524DMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Description:
- IC REG CTRLR BUCK/BOOST 16SOIC
- Quantity:
Unit Price:$1.42
Ext Price:$1.42
- Payment:
- Shipping:
Product Details
LM3524DMX/NOPB - TI Regulating PWM Controller
LM3524DMX/NOPB is an active Texas Instruments voltage-mode PWM controller supplied in a 16-pin SOIC (D) tape-and-reel package. It integrates a 5 V reference, error amplifier, programmable oscillator, pulse-steering logic, current limiting, shutdown control, and two uncommitted output transistors for regulated power-conversion designs.
Part-specific information is based on TI's current orderable-part data and the LM2524D/LM3524D datasheet. Confirm the latest manufacturer revision before design approval.
Overview
The LM3524DMX/NOPB generates fixed-frequency pulse-width-modulated control signals for switching regulators, inverters, and transformer-coupled converters. An external resistor and capacitor set the oscillator frequency. The internal flip-flop steers alternate PWM pulses to the two output stages for push-pull operation, while the outputs can also be combined for single-ended use.
The improved LM3524D architecture adds a precision reference, higher output-current capability, thermal shutdown, external synchronization through pin 3, single-pulse control, and double-pulse suppression. The MX ordering suffix identifies the large tape-and-reel option; /NOPB identifies the lead-free orderable part.
Key Advantages
Combines the reference, error amplifier, oscillator, comparator, pulse steering, current limit, and shutdown functions required by many regulated converters.
Two uncommitted output transistors support push-pull operation or parallel connection for single-ended control.
One-pulse-per-period logic and double-pulse suppression help prevent repeated drive pulses in noisy operating conditions.
The oscillator output at pin 3 can synchronize multiple controllers or accept an appropriate external clock signal.
Feature Summary
The internal reference supplies the controller circuitry and can support external bias functions within the datasheet limits.
External RT and CT components set the free-running oscillator frequency and dead-time behavior.
A differential current-limit amplifier overrides the error-amplifier command when the sense threshold is reached.
Thermal shutdown and a dedicated shutdown input provide additional control during abnormal or commanded stop conditions.
Package & Footprint
LM3524DMX/NOPB uses TI's 16-pin SOIC (D) surface-mount package. TI lists the package body at approximately 9.9 mm × 6.0 mm. The MX orderable part is supplied on a large tape-and-reel carrier of 2,500 pieces.
- Use TI's D-package drawing for pad dimensions and pin-1 orientation.
- Place local supply bypassing close to VIN and ground.
- Keep RT, CT, compensation, and current-sense paths away from switching nodes.
The package registry currently marks 16-SOIC.jpg as missing. Add and verify the JPEG before publishing this product page.
Pin Functions
The following mapping is for the 16-pin SOIC (D), top view shown in the TI datasheet.
Confirm the complete connection diagram, polarity, and output-transistor wiring in the current TI datasheet before PCB layout or substitution.
Key Specifications
| Orderable Part Number | LM3524DMX/NOPB |
|---|---|
| Manufacturer | Texas Instruments (TI) |
| Function | Regulating voltage-mode PWM controller |
| Package | 16-pin SOIC (D), surface mount |
| Carrier Quantity | 2,500 pieces, large tape and reel |
| Supply Range After Turn-On | 8 V to 40 V |
| Reference Output | 5 V nominal |
| Maximum Oscillator Frequency | 350 kHz minimum design limit for LM3524D under TI's stated test setup |
| Maximum Duty Cycle per Output | 49% typical at 20 kHz test conditions; outputs may be paralleled for single-ended operation |
| Current-Limit Sense Threshold | 200 mV typical |
| Output Current | Up to 200 mA DC per output within applicable ratings |
| Output Breakdown Rating | 40 V minimum for LM3524D under the stated test condition |
| Standby Current | 5 mA typical, 10 mA maximum at VIN = 40 V |
| Rated Ambient Range for Electrical Limits | 0 °C to +70 °C |
| Orderable-Part Operating Junction Range | 0 °C to +125 °C |
| Moisture Sensitivity | MSL 1, 260 °C peak reflow |
Electrical limits depend on the stated test conditions. Distinguish recommended operation, tested limits, and absolute maximum ratings when selecting components.
Replacement Considerations
Replacement choices fall into different compatibility levels. The following models are present in our product catalog where links are shown. Confirm the exact package, output-current capability, oscillator behavior, temperature range, and lifecycle before substitution.
- LM3524DM/NOPB — the closest ordering alternative. It uses the same LM3524D controller and 16-pin SOIC (D) package, but ships in tubes of 48 rather than a 2,500-piece reel.
- SG3524DR — an active TI 16-pin SOIC (D) PWM controller in the standard 3524 architecture. It shares the narrow-body footprint, but its output-current and frequency specifications differ from LM3524D and require circuit validation.
- SG3524DRE4 — a cataloged SOIC (D) SG3524 ordering option. Treat it as an SG3524-family comparison candidate and confirm current orderability and electrical limits.
- UC3524ADWTR — an enhanced 3524-family PWM controller with higher output capability, supplied in a wider 16-pin SOIC (DW) package. It requires a different PCB footprint and full electrical review.
- LM25037 — TI support has identified this as a close functional alternative when a simulation model is required. It is not pin compatible with LM3524D and is suitable only for a redesign.
- Direct sourcing change: prefer LM3524DM/NOPB when tube packaging is acceptable.
- Same footprint candidate: compare SG3524DR carefully, especially output drive and oscillator limits.
- Redesign candidates: UC3524ADWTR and LM25037 require footprint and circuit changes.
- Validation: repeat startup, current-limit, compensation, duty-cycle, thermal, and fault testing in the actual converter.
A shared pinout or function does not establish complete electrical interchangeability.
Manufacturer Information
Texas Instruments publishes the LM3524D product information, orderable-part status, package data, and application guidance. Use the exact LM3524DMX/NOPB ordering code for procurement because carrier type and environmental suffixes are part-specific.
- Technical source: TI LM2524D/LM3524D Regulating Pulse Width Modulator datasheet, document SNVS766E.
- Orderable-part source: TI package addendum and carrier-material information for LM3524DMX/NOPB.
- Alternative sources: TI SG3524, UC3524A, and LM25037 support information.
Applications
The controller can be configured for several fixed-frequency power-conversion functions. Final suitability depends on the selected external switches, magnetics, sensing, feedback, and protection design.
Push-Pull Converters
Alternating output pulses can drive external stages used in transformer-coupled DC/DC conversion.
Step-Down Regulators
Voltage-mode regulation with external power components for buck-derived converter designs.
Step-Up Regulators
Programmable PWM control for boost-derived stages with suitable current limiting and compensation.
Polarity Conversion
Control functions for inverting or auxiliary-rail converters based on the manufacturer's application circuits.
Quality & Authenticity
- Part identification: confirm the complete LM3524DMX/NOPB code, TI marking, SOIC-16 package, and pin-1 orientation.
- Packaging: verify the manufacturer reel label, quantity, lot trace code, and moisture handling condition.
- Assembly: follow TI's current MSL, reflow, ESD, and land-pattern instructions.
- Source control: retain procurement and traceability records required by the application.
FAQ
What is the difference between LM3524DMX/NOPB and LM3524DM/NOPB?
Can SG3524DR directly replace LM3524DMX/NOPB?
Can the two outputs be used for a single-ended converter?
Why is the package image not displayed yet?
Engineering Notice
LM3524DMX/NOPB Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 8V ~ 40V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 49%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
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Inventory:715
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In Stock:715
| Qty. | Unit Price | Ext. Price |
| 1+ | $1.42 | $1.42 |
| 10+ | $1.05 | $10.50 |
| 25+ | $0.96 | $24.00 |
| 100+ | $0.85 | $85.00 |
| 250+ | $0.80 | $200.00 |
| 500+ | $0.77 | $385.00 |
| 1000+ | $0.77 | $770.00 |
| 2500+ | $0.72 | $1800.00 |
| 5000+ | $0.71 | $3550.00 |
| 7500+ | $0.70 | $5250.00 |
