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Texas Instruments LP5524TM-5/NOPB
- Part No.:
- LP5524TM-5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 9-WFBGA, DSBGA
- Datasheet:
-
LP5524TM-5/NOPB.pdf
- Description:
- IC LED DRVR LIN PWM 25MA 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:738
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Product details
Overview
LP5524TM-5/NOPB from Texas Instruments is a four-channel high-side LED driver IC with dual independent PWM enable control, 2.7–5.5 V input range, ±0.4% typical current matching across channels, and factory-programmable or resistor-set LED current up to 25 mA per channel - used in keypad backlighting and indicator lighting where precise brightness uniformity and compact size are critical.
For engineers reviewing the LP5524TM-5/NOPB datasheet, LP5524TM-5/NOPB pinout, LP5524TM-5/NOPB application, or LP5524TM-5/NOPB equivalent, key selection considerations include its 9-pin DSBGA package (1.24 mm × 1.24 mm), dual-bank enable architecture (ENA/ENB), ISET-based current programming, headroom voltage dependency (VHR ≥ 10 mV at 5 mA), and absence of external passive components in basic operation.
Technical Context
The LP5524TM-5/NOPB integrates two independently enabled banks (A and B), each driving two high-side constant-current sources (D1A/D2A and D1B/D2B), with internal current mirroring from the ISET pin (416:1 ratio). It operates without external inductors or capacitors for basic LED drive, relying on VIN-to-DX headroom voltage (VHR) for regulation - minimum 10 mV at 5 mA, rising to 75 mV at 15 mA over temperature.
Each enable input (ENA, ENB) is active-high with internal pulldown; shutdown supply current is 0.2 µA. PWM brightness control is implemented directly at the enable pins, with 33 µs minimum recommended ON time and linear average current scaling versus duty cycle - e.g., 50% duty yields 50% average output current relative to programmed IDX.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion, Li-poly, or 3.3 V/5 V rail without LDO pre-regulation. |
| Max LED Current per Channel | 25 mA - sufficient for bright indicator LEDs and low-power sub-display backlights. |
| Current Matching | ±0.4% typical - ensures uniform brightness across all four LEDs without per-channel calibration. |
| Headroom Voltage (VHR) | 10 mV min at 5 mA - defines minimum (VIN – VDX) required for stable current regulation; impacts max LED forward voltage. |
| ISET Mirroring Ratio | 416:1 - enables precise current setting via external resistor (e.g., 32.4 kΩ sets 15.9 mA). |
| Shutdown Supply Current | 0.2 µA - allows ultra-low-power standby in battery-operated devices when both ENA and ENB are low. |
| PWM Minimum ON Time | 33 µs - constrains usable PWM frequency lower bound (~30 kHz for 1% resolution); avoids incomplete turn-on. |
Pinout & Package
LP5524TM-5/NOPB uses a 9-pin DSBGA (YFQ) package measuring 1.24 mm × 1.24 mm × 0.6 mm (max), with 0.4-mm pitch and bottom-side solder balls. Pin 1 (ENA) is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | ISET | Analog input for external current-setting resistor; internal 1.237 V reference enables 416× current mirroring. |
| A2 | ENB | Digital input enabling Bank B (D1B/D2B); active-high with internal pulldown - no external pull-down needed. |
| A3 | ENA | Digital input enabling Bank A (D1A/D2A); independent of ENB for dual-zone brightness control. |
| B1 | D1B | High-side current source output for Bank B, LED1 - connects directly to anode of LED cathode-grounded. |
| B2 | VIN | Main power input (2.7–5.5 V); supplies internal circuitry and current sources; requires local 100 nF ceramic decoupling. |
| B3 | D1A | High-side current source output for Bank A, LED1 - electrically isolated from Bank B outputs. |
| C1 | D2B | High-side current source output for Bank B, LED2 - shares enable (ENB) but independent current path from D1B. |
| C2 | GND | Ground reference for all internal circuitry and current sink return path - must be low-impedance connection. |
| C3 | D2A | High-side current source output for Bank A, LED2 - enables 2×2 LED matrix or dual independent indicators. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable banks (A/B) | Enables two-stage brightness control - e.g., 25 mA with ENA only, 50 mA with ENA+ENB - without changing PWM or ISET. |
| No external passives required | Operates with zero external inductors, capacitors, or MOSFETs - reduces BOM count and PCB area in space-constrained designs. |
| 0.4% typical current matching | Minimizes visible brightness variation across four LEDs - critical for aesthetic consistency in user-facing indicators. |
| Ultra-small DSBGA footprint | 1.24 mm × 1.24 mm area fits within tight mechanical envelopes (e.g., thin mobile bezels, wearable displays). |
| Factory-programmable default current | Eliminates need for ISET resistor in standard applications - simplifies layout and lowers cost where 5 mA or 15 mA suffices. |
Applications
| Keypad Backlight | Indicator Lighting |
|---|---|
|
Use Scenario: Illuminating alphanumeric keys on handheld industrial terminals or medical device interfaces under variable ambient light. IC Role / Device Role / Timing Role: High-side constant-current source driving four parallel-key LEDs with independent bank enable for dimming zones. Use Value: 0.4% current matching ensures uniform key brightness; 25 mA per channel delivers sufficient luminance without thermal derating in sealed enclosures. |
Use Scenario: Providing status indication (power-on, fault, connectivity) on consumer electronics front panels. IC Role / Device Role / Timing Role: Dual-bank PWM-controlled LED driver enabling two-color or multi-intensity alerts using shared ISET and separate ENA/ENB signals. Use Value: Independent bank control allows simultaneous red/green signaling or stepped intensity (e.g., slow blink → fast blink) without MCU GPIO expansion. |
| Sub-Display Backlight | Low-Power UI Lighting |
|
Use Scenario: Backlighting small monochrome LCD segments (e.g., fuel gauge, battery icon) in automotive instrument clusters. IC Role / Device Role / Timing Role: Four-channel high-side driver supplying matched current to discrete LEDs behind segmented display areas. Use Value: Headroom voltage as low as 10 mV enables use with low-VF LEDs even at 2.7 V supply - critical for cold-cranking automotive conditions. |
Use Scenario: Powering always-on status LEDs in IoT edge nodes powered by coin cells or energy-harvesting sources. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current LED driver (0.2 µA shutdown) with programmable current scaling via ISET resistor. Use Value: Shutdown mode eliminates leakage paths; optional ISET allows current tuning to match LED efficiency and extend battery life beyond fixed 5 mA default. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP5523TMX/NOPB | Three-channel version with identical 9-pin DSBGA package, same ISET mirroring ratio and 25 mA/channel rating, but lacks D2B output. | Suitable only for 3-LED systems; cannot support full 4-LED dual-bank configuration or parallel-output brightness doubling. | Select when BOM reduction for 3-LED layouts outweighs loss of fourth channel flexibility. |
| TPS61165DRVR | Boost-based LED driver with integrated inductor switch; supports up to 30 mA per channel but requires external inductor and diode. | Enables driving higher-VF LEDs (e.g., white) from 2.7 V input - unlike LP5524TM-5/NOPB's high-side current-source topology. | Choose when LED forward voltage exceeds (VIN – 0.075 V); LP5524TM-5/NOPB is unsuitable for >2.625 VF at 2.7 V input. |
Compared with LP5524TM-5/NOPB, LP5523TMX/NOPB offers identical performance in a 3-channel subset but sacrifices dual-bank scalability, while TPS61165DRVR trades simplicity and size for boost capability - making LP5524TM-5/NOPB optimal for compact, low-VF, matched-current indicator applications.
Availability
LP5524TM-5/NOPB is available at Aetrix Electronics and suitable for keypad backlighting, indicator lighting, sub-display backlighting, and low-power UI lighting requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LP5524TM-5/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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability IC design.
The LP5524TM-5/NOPB belongs to TI's precision LED driver product line, engineered for space-constrained portable and industrial human-interface applications demanding uniform brightness, minimal external components, and robust thermal behavior.
FAQ
What is the maximum LED forward voltage supported by LP5524TM-5/NOPB at 2.7 V input?
The LP5524TM-5/NOPB requires minimum headroom voltage (VHR) of 10 mV at 5 mA LED current. At 2.7 V input, maximum supported LED forward voltage is therefore 2.7 V − 0.01 V = 2.69 V. For 15 mA operation, VHR rises to 75 mV, limiting VF to 2.625 V - verified in Section 7.3.1 and Figure 4 of the LP5524TM-5/NOPB datasheet.
Can LP5524TM-5/NOPB drive more than 25 mA per channel?
No - LP5524TM-5/NOPB is rated for maximum 25 mA per channel. However, outputs within the same bank (e.g., D1A + D2A) can be paralleled to deliver up to 50 mA to a single LED string, as described in Section 7.3.3. This does not increase per-channel current but leverages dual outputs for higher total current per enable signal.
Is an external capacitor required on the VIN pin of LP5524TM-5/NOPB?
No external capacitor is required for basic LP5524TM-5/NOPB operation, but TI recommends a 100 nF X7R/X5R ceramic capacitor placed close to the VIN and GND pins to suppress line noise and improve transient response during enable switching - per Section 8.2.2.1.1 and Layout Guidelines.
How does the ISET pin function in LP5524TM-5/NOPB when no external resistor is connected?
When no external resistor is connected, the LP5524TM-5/NOPB ISET pin may be left floating or tied to VIN, and the device defaults to factory-programmed LED current (typically 5 mA or 15 mA depending on variant). The internal 1.237 V reference remains active, but current mirroring is disabled without RISET - confirmed in Section 7.4.2 and Table 3 of the LP5524TM-5/NOPB datasheet.
What is the thermal shutdown behavior of LP5524TM-5/NOPB?
The LP5524TM-5/NOPB incorporates internal thermal shutdown that activates at approximately 160°C junction temperature and releases at ~140°C. This protects against permanent damage during sustained overload or poor PCB thermal design. The device's RθJA is 101.9°C/W (YFQ package), so ambient derating is required above 85°C - detailed in Section 6.4 and Absolute Maximum Ratings.
LP5524TM-5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-DSBGA
LP5524TM-5/NOPB FAQ
1.How can I place an order for LP5524TM-5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5524TM-5/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 LP5524TM-5/NOPB reliable?
The price and inventory of LP5524TM-5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5524TM-5/NOPB is usually 5 days.
3.What payment methods are accepted for LP5524TM-5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5524TM-5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5524TM-5/NOPB?
LP5524TM-5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5524TM-5/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 LP5524TM-5/NOPB?
For technical support, including LP5524TM-5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5524TM-5/NOPB requirements.
6.How does Aetrix verify that LP5524TM-5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5524TM-5/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 LP5524TM-5/NOPB meets industry standards.
7.What is the process for return or replacement of LP5524TM-5/NOPB?
All LP5524TM-5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5524TM-5/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 LP5524TM-5/NOPB part is unused and in its original packaging.
Return procedure for LP5524TM-5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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