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Texas Instruments LM2793LD/NOPB
- Part No.:
- LM2793LD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2793LD/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 16MA 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,062
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Product details
Overview
LM2793LD/NOPB from Texas Instruments is a low-noise, 1.5× CMOS charge pump white LED driver IC with dual regulated current outputs (up to 16 mA each), analog/PWM dual-function brightness control via SD-BRGT pin, and fixed 500 kHz switching frequency. It operates from 2.7 V to 5.5 V input, delivers matched current within ±0.3% (typ.), and targets compact backlighting in single-cell Li-ion portable devices.
For engineers reviewing the LM2793LD/NOPB datasheet, LM2793LD/NOPB pinout, LM2793LD/NOPB application, or LM2793LD/NOPB equivalent, key selection considerations include its dual-current-source architecture, 3.0 mm × 3.0 mm LLP-10 package, no-inductor design, pre-regulated POUT output, and dual-mode (analog voltage + PWM) brightness interface - all critical for space-constrained, low-EMI LED backlight systems.
Technical Context
The LM2793LD/NOPB integrates a semi-regulated 1.5× switched-capacitor charge pump with two matched current sources referenced to POUT. Its pre-regulation circuitry limits gate drive above ~3.3 V input to loosely regulate POUT at 4.9 V (typ.), reducing input current noise spikes.
LED current is set by SD-BRGT pin voltage (0.75–2.75 V linear range) or PWM duty cycle (100 Hz–1 kHz), with shutdown activated below 0.35 V (typ.). Soft-start ramps internal reference to limit inrush during startup, and thermal protection disables operation above 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports direct connection to single-cell Li-ion batteries (fully charged to depleted). |
| Output Current per Channel | Up to 16 mA - sufficient for driving high-VF white LEDs (3.0–4.0 V) in parallel or series configurations. |
| Current Matching Accuracy | ±0.3% (typ.) - ensures uniform brightness across dual LED strings without external calibration. |
| Switching Frequency | 500 kHz (325–675 kHz range) - enables use of small 1 µF ceramic flying/hold capacitors; avoids audible noise. |
| Shutdown Current | 3 µA (typ.) - minimizes battery drain during display-off states in portable equipment. |
| Headroom Voltage (VHR-min) | 400 mV at 16 mA - defines minimum voltage difference between POUT and LED anode required for stable current regulation. |
| Package | LLP-10 (3.0 mm × 3.0 mm × 0.8 mm) - leadless, thermally enhanced chip-scale package with exposed DAP for PCB heat sinking. |
Pinout & Package
LM2793LD/NOPB uses the 10-pin Leadless Leadframe Package (LLP-10), NS Package Number LDA10A, with 2.0 mm × 1.2 mm exposed die attach pad (DAP) centered on the bottom for thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power supply input | Accepts 2.7–5.5 V DC; connects to input capacitor (CIN = 1 µF) and battery source. |
| 2 C1− | Flying capacitor terminal | Completes first half-cycle of 1.5× charge pump; requires low-ESR ceramic capacitor (C1 = 1 µF). |
| 3 C2+ | Flying capacitor terminal | Completes second half-cycle; pairs with C2− (Pin 10) to form charge transfer path. |
| 4 C1+ | Flying capacitor terminal | Alternate connection for C1; forms bidirectional flying capacitor network with Pin 2. |
| 5 POUT | Charge pump output node | Loosely regulated ~4.9 V (typ.) above 3.3 V input; supplies both current sources (D1/D2) and holds output voltage during load transients. |
| 6 D1 | Constant current sink output | Sinks up to 16 mA to LED cathode; current set by SD-BRGT voltage or PWM; requires LED anode connected to POUT. |
| 7 D2 | Constant current sink output | Identical to D1; matched within ±0.3% (typ.) - enables dual independent or paralleled LED strings. |
| 8 SD-BRGT | Dual-function control pin | Ground = shutdown (3 µA IQ); 0.75–2.75 V = linear brightness control; >2.75 V = full 16 mA; PWM input accepted (100 Hz–1 kHz). |
| 9 GND | Power ground reference | Primary return path for VIN, flying caps, and current sinks; must be low-impedance connection to PCB ground plane. |
| 10 C2− | Flying capacitor terminal | Completes C2 loop with Pin 3; forms complementary flying capacitor pair with C1 terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched current sources | 16 mA max per channel, ±0.3% typical matching - eliminates need for individual current-setting resistors and ensures consistent LED luminance. |
| No-inductor architecture | Uses only four 1 µF MLCCs (C1, C2, CIN, CHOLD) - reduces board area, EMI, and BOM cost versus inductive boost solutions. |
| Pre-regulated charge pump | POUT clamped at ~4.9 V (typ.) above 3.3 V input - suppresses input ripple and conducted noise critical for RF-sensitive handhelds. |
| Soft-start circuitry | Internal ramp limits inrush current during power-up - prevents voltage droop on shared battery rails and extends capacitor lifetime. |
| Thermal protection | Auto-shutdown at 150 °C junction temperature, auto-recovery at 125 °C - safeguards device under sustained high-power or poor heatsinking conditions. |
Applications
| White LED Display Backlights | White LED Keypad Backlights |
|---|---|
|
Use Scenario: Driving dual white LED strings behind LCD segments in PDAs or handheld PCs with single Li-ion cell supply. IC Role / Device Role / Timing Role: Constant-current charge pump LED driver providing regulated 16 mA per string with analog brightness scaling. Use Value: Enables uniform, flicker-free illumination across display area using only ceramic capacitors - no inductor size or EMI filtering overhead. |
Use Scenario: Illuminating alphanumeric keypad LEDs in cellular phones powered by 3.6 V nominal Li-ion battery. IC Role / Device Role / Timing Role: Dual-output current sink delivering matched current to discrete keypad LEDs with PWM-dimmed brightness. Use Value: Achieves precise dimming control down to 0.1 mA (via SD-BRGT = 0.75 V) while maintaining <±0.3% channel matching for consistent key visibility. |
| 1-Cell Li-ion Portable Devices | Flat Panel Display Modules |
|
Use Scenario: Powering backlit status indicators and UI LEDs in battery-operated medical handhelds or barcode scanners. IC Role / Device Role / Timing Role: Low-quiescent (3 µA shutdown) LED driver supporting rapid on/off cycling and analog dimming via host MCU DAC output. Use Value: Extends battery runtime in always-on devices by minimizing standby current and enabling fine-grained brightness adjustment without software overhead. |
Use Scenario: Providing edge-lit backlighting for small-format TFT panels in industrial HMIs or point-of-sale terminals. IC Role / Device Role / Timing Role: Dual-channel constant-current source driving parallel LED strings from 3.3–5.5 V system rail with thermal derating support. Use Value: Delivers stable luminance over temperature (−30 °C to +85 °C ambient) and input voltage variation, with POUT headroom ensuring regulation even as battery discharges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED constant-current driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61160DRVR | Inductive boost converter (not charge pump); higher efficiency at low VIN; requires external inductor and diode. | Better suited for ultra-low-input (1.8–3.3 V) or high-current (>20 mA) LED strings where inductor size is acceptable. | Select TPS61160DRVR when input voltage drops below 2.7 V or when >16 mA per channel is required - but expect larger solution size and higher EMI. |
| MAX1910EUB+ | Charge pump with single 20 mA output; no dual-channel capability; uses different pinout and brightness control scheme (external resistor + PWM). | Limited to single-LED or paralleled-LED loads; lacks matched dual outputs for independent string control. | Choose MAX1910EUB+ only for cost-sensitive single-LED applications where channel matching and dual control are unnecessary. |
Compared with TPS61160DRVR and MAX1910EUB+, LM2793LD/NOPB uniquely delivers matched dual 16 mA outputs in a no-inductor, 3 mm × 3 mm footprint - making it optimal for compact, low-EMI dual-string backlighting where input stays within 2.7–5.5 V and precise luminance uniformity is mandatory.
Availability
LM2793LD/NOPB is available at Aetrix Electronics and suitable for white LED display backlights, keypad illumination, and 1-cell Li-ion portable electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2793LD/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 digital signal technologies, with broad portfolio coverage across industrial, automotive, and consumer markets.
LM2793LD/NOPB belongs to TI's precision LED driver product line, engineered specifically for low-noise, compact backlighting in battery-powered portable devices - emphasizing efficiency, small solution size, and dual-channel matching without magnetic components.
FAQ
What is the primary function of the LM2793LD/NOPB?
The LM2793LD/NOPB is a dual-output, low-noise white LED constant-current driver IC that uses a 1.5× CMOS charge pump to generate regulated current (up to 16 mA per channel) from a 2.7–5.5 V input. Its core function is to provide matched, adjustable LED current for backlighting applications without requiring inductors - making LM2793LD/NOPB ideal for space-constrained portable electronics.
How does brightness control work on the LM2793LD/NOPB?
Brightness on the LM2793LD/NOPB is controlled via the SD-BRGT pin using either analog voltage (0.75–2.75 V linear range) or PWM signal (100 Hz–1 kHz). At 0.75 V, output current drops to ~0.1 mA; at 2.75 V, it reaches full 16 mA; above 2.75 V, current saturates. Grounding SD-BRGT shuts down LM2793LD/NOPB, reducing supply current to 3 µA (typ.).
What package type does the LM2793LD/NOPB use, and why is it significant?
The LM2793LD/NOPB uses the 10-pin LLP-10 (Leadless Leadframe Package), measuring 3.0 mm × 3.0 mm × 0.8 mm with an exposed 2.0 mm × 1.2 mm die attach pad (DAP). This package enables excellent thermal performance in minimal area - critical for handheld devices where power density and board space are constrained. The DAP must be soldered to a thermal land on the PCB for effective heat dissipation.
Can the LM2793LD/NOPB drive a single LED with higher current?
Yes - the D1 and D2 outputs of LM2793LD/NOPB can be paralleled to drive one LED at up to 32 mA total. To do so, configure SD-BRGT to set each channel to half the desired current (e.g., 15 mA per channel for 30 mA total). This configuration maintains LM2793LD/NOPB's internal regulation and matching specs, with no impact on electrical characteristics or reliability.
What are the key capacitor requirements for stable operation of the LM2793LD/NOPB?
LM2793LD/NOPB requires four 1 µF low-ESR multilayer ceramic capacitors (MLCCs): C1 and C2 (flying), CIN (input), and CHOLD (hold). X7R or X5R dielectrics are recommended for stability over temperature and voltage; Y5V/Z5U types are discouraged due to severe capacitance loss (down to 0.1 µF) under bias or temperature extremes - which risks failure to meet LM2793LD/NOPB's minimum capacitance requirements.
LM2793LD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 16mA
- Frequency:
- 500kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (3x3)
LM2793LD/NOPB FAQ
1.How can I place an order for LM2793LD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2793LD/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 LM2793LD/NOPB reliable?
The price and inventory of LM2793LD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2793LD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2793LD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2793LD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2793LD/NOPB?
LM2793LD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2793LD/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 LM2793LD/NOPB?
For technical support, including LM2793LD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2793LD/NOPB requirements.
6.How does Aetrix verify that LM2793LD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2793LD/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 LM2793LD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2793LD/NOPB?
All LM2793LD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2793LD/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 LM2793LD/NOPB part is unused and in its original packaging.
Return procedure for LM2793LD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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