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Texas Instruments TPS61042DRBR
- Part No.:
- TPS61042DRBR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS61042DRBR.pdf
- Description:
- IC LED DRVR RGLTR PWM 60MA 8SON
- Quantity:
- Payment:
- Shipping:
Inventory:7,750
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Product details
Overview
TPS61042DRBR from Texas Instruments is a constant-current boost LED driver IC with integrated 30 V/500 mA main switch and 30 V/60 mA LED switch, regulating LED current via 252 mV feedback reference across external sense resistor RS, operating from 1.8 V to 6 V input, supporting up to 27.5 V output for white LED backlighting in portable displays.
For engineers reviewing the TPS61042DRBR datasheet, TPS61042DRBR pinout, TPS61042DRBR application, or TPS61042DRBR equivalent, key selection considerations include its PWM/analog brightness control (100 Hz–50 kHz), 85% typical efficiency at 3.6 V input driving 4 LEDs, OVP threshold of 27.5–30 V, 38 µA no-load quiescent current, and 3 mm × 3 mm SON-8 package with exposed thermal pad.
Technical Context
The TPS61042DRBR implements pulse-frequency modulation (PFM) with peak-current control (500 mA typ), enabling discontinuous conduction mode (DCM) operation where switching frequency varies with load, input/output voltage, and inductor value-ensuring high efficiency across wide LED current ranges. Its dual-switch architecture separates power conversion (Q1) from LED current path (Q2), allowing independent shutdown of LEDs during disable.
Feedback regulation targets 252 mV ±8 mV across RS to set LED current; overvoltage protection triggers at 27.5–30 V on OVP pin with 5–7 V hysteresis; CTRL pin serves as combined enable/PWM input with 50 µs minimum high pulse to enable and ≥32 ms low pulse to disable, while also accepting 100 Hz–50 kHz PWM for linear brightness control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 6 V - supports single-cell Li-ion, NiMH, or alkaline battery operation without pre-regulation. |
| LED Current Accuracy | Regulated by 252 mV ±8 mV FB reference - sets precise LED current via RS = 252 mV / ILED, e.g., 13 Ω for ~19.4 mA. |
| Switch Ratings | 30 V internal main switch (Q1), 500 mA peak current limit; 30 V LED switch (Q2), 60 mA max continuous current. |
| Efficiency | Up to 85% typ - measured driving 4 white LEDs (~13 V) at 15 mA with 3.6 V input and 4.7 µH inductor. |
| Quiescent Current | 38 µA typ (no load, not switching) - enables ultra-low power standby in battery-powered devices. |
| OVP Threshold | 27.5 V to 30 V - protects Q1 from overvoltage during open-circuit or fault conditions; 5–7 V hysteresis prevents oscillation. |
| CTRL PWM Range | 100 Hz to 50 kHz - allows flexible microcontroller-based dimming without requiring high-speed timing peripherals. |
Pinout & Package
The TPS61042DRBR is housed in a thermally enhanced 3 mm × 3 mm SON-8 (DRB) package with exposed thermal die pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED (Pin 1) | LED switch source | Connects to cathode of series-connected LEDs; Q2 opens during shutdown to eliminate leakage current. |
| RS (Pin 2) | Current sense return | Completes current path for LED current through external sense resistor; voltage at FB is regulated relative to this node. |
| VIN (Pin 3) | Main supply input | Accepts 1.8–6 V input; powers internal bias circuits and main switch driver; requires 4.7 µF local ceramic capacitor. |
| FB (Pin 4) | Feedback input | High-impedance MOSFET gate input sensing voltage across RS; regulates to 252 mV to fix LED current. |
| CTRL (Pin 5) | Enable/PWM control | Combined digital enable (≥50 µs high) and PWM dimming input (100 Hz–50 kHz); disables Q2 when pulled low ≥32 ms. |
| GND (Pin 6) | Power ground | Reference for VIN, FB, CTRL, and OVP; must be low-impedance connection to exposed thermal pad. |
| OVP (Pin 7) | Overvoltage monitor | Monitors output capacitor voltage; shuts down Q1 if exceeds 27.5–30 V; requires direct connection to CO node. |
| SW (Pin 8) | Boost switch drain | Connects to inductor and Schottky diode anode; switches at up to 1 MHz; requires low-inductance layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-MOSFET architecture | Separates boost conversion (Q1) from LED current path (Q2), enabling true LED disconnection during shutdown and eliminating dark-current leakage. |
| Precision current regulation | 252 mV ±8 mV FB reference ensures LED current accuracy independent of input voltage, temperature, or LED forward-voltage variation. |
| Flexible brightness control | Single-pin CTRL accepts either PWM (100 Hz–50 kHz) or analog voltage (via resistor divider), simplifying system-level dimming implementation. |
| Robust protection suite | Includes undervoltage lockout (1.5–1.7 V), overvoltage protection (27.5–30 V), thermal shutdown (~160 °C), and soft-start limiting inrush current. |
| Small-footprint power solution | 3 mm × 3 mm SON-8 package with exposed thermal pad supports compact, low-profile designs (<1 mm total height with 4.7 µH inductor). |
Applications
| Smartphone Backlight | Portable Media Player Display |
|---|---|
Use Scenario: Driving 4–6 white LEDs in series for LCD backlight in space-constrained smartphones with single-cell Li-ion battery (3.0–4.2 V). IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED current via FB/RS loop while dynamically adjusting output voltage to match LED string VF. Use Value: Delivers 82–85% efficiency at 15–20 mA per string, extends battery life, and eliminates need for external current-sink transistors or discrete OVP circuitry. | Use Scenario: Powering side-lit LED arrays in handheld gaming devices or e-readers using alkaline or NiMH batteries (1.8–4.5 V). IC Role / Device Role / Timing Role: High-frequency PFM boost converter maintaining stable LED current despite wide input voltage swing and varying LED aging characteristics. Use Value: Achieves <38 µA quiescent current in shutdown mode and supports analog dimming via simple resistor network, reducing MCU GPIO count and firmware complexity. |
| Industrial Handheld Scanner | Medical Diagnostic Display |
Use Scenario: Illuminating high-brightness LED indicators and status lights in ruggedized industrial scanners powered by replaceable AA/AAA cells. IC Role / Device Role / Timing Role: LED driver with integrated OVP and thermal shutdown ensuring safe operation under intermittent high-current pulses and elevated ambient temperatures. Use Value: Withstands 30 V output transients and provides reliable 60 mA LED switch current rating, eliminating risk of LED overcurrent damage during cold-start or battery replacement events. | Use Scenario: Providing flicker-free, precisely calibrated backlight for monochrome or color LCD panels in portable diagnostic tools requiring consistent luminance across operating temperature range. IC Role / Device Role / Timing Role: Precision current source with 252 mV FB reference and low tempco (±0.02%/°C), enabling stable LED output over –40°C to +85°C ambient. Use Value: Maintains <±5% LED current variation across temperature and input voltage, critical for accurate grayscale rendering and regulatory compliance in medical imaging applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBR | Same package and pinout; lower 28 V switch rating and 400 mA peak current limit; identical FB reference and CTRL interface. | Suitable for ≤24 V LED strings and lower-power applications; reduced headroom limits max LED count vs. TPS61042DRBR. | Select TPS61040DRBR only when output voltage remains below 24 V and peak inductor current stays under 400 mA. |
| MAX1910EUT+T | 20 V switch rating, 1.2 MHz fixed-frequency PWM control, no integrated LED switch; requires external MOSFET for LED disconnect. | Lacks integrated OVP and true LED shutdown; higher switching frequency enables smaller inductors but increases EMI sensitivity. | Choose MAX1910EUT+T only when board area permits external FET and system design tolerates absence of OVP and leakage-free shutdown. |
Compared with TPS61040DRBR, the TPS61042DRBR offers higher 30 V/500 mA switch ratings for longer LED strings and greater transient margin; versus MAX1910EUT+T, it integrates both power and LED switches plus OVP, reducing BOM count and improving reliability in portable medical and industrial displays.
Availability
TPS61042DRBR is available at Aetrix Electronics and suitable for smartphone backlighting, portable media player displays, industrial handheld scanners, and medical diagnostic displays requiring stable component supply and long-term production continuity.
Supply support for TPS61042DRBR 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 specializing in analog, embedded processing, and power management technologies, with leadership in high-efficiency DC/DC conversion and precision analog signal chains.
The TPS61042DRBR belongs to TI's constant-current LED driver product line, designed specifically for space-constrained, battery-powered portable displays requiring high efficiency, precise current regulation, and robust fault protection.
FAQ
What is the maximum number of white LEDs the TPS61042DRBR can drive in series?
The TPS61042DRBR supports up to 27.5 V output voltage, enabling it to drive 6–8 standard white LEDs (VF ≈ 3.2–3.6 V each) in series depending on forward voltage tolerance and temperature. At 3.6 V input and 19 mA LED current, TI's Figure 18 shows 6 LEDs with 84% efficiency, and Figure 19 shows 8 LEDs with 81% efficiency-both using a 4.7 µH inductor and ZHCS400 Schottky diode. The actual count depends on worst-case VF and minimum input voltage.
How does the TPS61042DRBR achieve LED current regulation without a current-sense amplifier?
The TPS61042DRBR uses direct feedback regulation: the FB pin senses voltage across the external sense resistor RS and internally regulates it to 252 mV ±8 mV. Since ILED = 252 mV / RS, current is set purely by resistor value-eliminating need for op-amps or gain calibration. This architecture provides inherent accuracy, low tempco, and immunity to input/output voltage variations, as confirmed in Section 8.1 and Figure 12 of the SLVS441D datasheet.
Can the TPS61042DRBR operate with a 100 nF output capacitor, and what is the trade-off?
Yes, the TPS61042DRBR is specified to operate with output capacitors as small as 100 nF (CO), enabling ultra-thin designs. However, smaller CO increases LED ripple current and degrades line regulation-TI recommends ≥1 µF for low-ripple applications (see footnote † in Figure 4). With 100 nF, ripple may exceed 20% of average current; upgrading to 1 µF reduces ripple by >5× and improves stability under dynamic load steps, as shown in Figure 17 and Section 9.1.4.
What happens to the LEDs during TPS61042DRBR shutdown, and how is leakage prevented?
During shutdown (CTRL held low ≥32 ms), the TPS61042DRBR opens its internal LED switch (Q2) between Pin 1 (LED) and Pin 2 (RS), physically disconnecting the LED string from ground. This eliminates reverse leakage current through the LEDs-critical for battery-powered devices where even µA-level leakage depletes charge over time. The datasheet confirms this behavior in Section 1 ("Disconnects LEDs During Shutdown") and Section 8.4.2 ("Undervoltage Lockout"), ensuring zero current flow when disabled.
Is the TPS61042DRBR compatible with PWM dimming frequencies outside the 100 Hz–50 kHz range?
No-the TPS61042DRBR's CTRL pin is characterized and guaranteed only for PWM frequencies from 100 Hz to 50 kHz. Frequencies below 100 Hz risk forcing shutdown (if off-time exceeds 10 ms), while frequencies above 50 kHz may cause incomplete switching cycles due to minimum on/off time constraints (50 µs enable pulse, 400 ns comparator blanking). TI explicitly states "PWM switching frequency applied to CTRL" is 0.1–50 kHz in Section 7.5, and Figure 11 defines timing limits that exclude operation beyond this band.
TPS61042DRBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 1.8V
- Voltage - Supply (Max):
- 6V
- Voltage - Output:
- 27.5V
- Current - Output / Channel:
- 60mA (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
TPS61042DRBR FAQ
1.How can I place an order for TPS61042DRBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61042DRBR 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 TPS61042DRBR reliable?
The price and inventory of TPS61042DRBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61042DRBR is usually 5 days.
3.What payment methods are accepted for TPS61042DRBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61042DRBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61042DRBR?
TPS61042DRBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61042DRBR 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 TPS61042DRBR?
For technical support, including TPS61042DRBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61042DRBR requirements.
6.How does Aetrix verify that TPS61042DRBR is sourced from the original manufacturer or authorized distributors?
All TPS61042DRBR 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 TPS61042DRBR meets industry standards.
7.What is the process for return or replacement of TPS61042DRBR?
All TPS61042DRBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61042DRBR, 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 TPS61042DRBR part is unused and in its original packaging.
Return procedure for TPS61042DRBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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