TPS61194PWPR - 4-Ch 100mA Low-EMI LED Driver | Texas Instruments
MPN: TPS61194PWPR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
| 3,000 | $1.61 | $4,830.00 |
TPS61194PWPR Overview
A four-channel LED driver is a power management IC that integrates a switching converter (boost or SEPIC) with multiple current-sink outputs. The converter stages up an input supply to the voltage required by the LED string, while the current sinks regulate individual LED strings with high accuracy. This category sits within the broader hierarchy of power management IC -> LED driver -> backlight driver -> display power, and is used wherever multiple LED strings must be driven with tightly matched brightness, such as in automotive clusters, industrial HMIs, and large LCD backlights. The TPS61194 is engineered specifically for low electromagnetic emissions, easing CISPR 25 / CISPR 32 compliance in automotive and industrial systems.
Key features of the TPS61194PWPR include 4.5 V to 40 V wide VIN range, 100 mP / channel current capability with PWM dimming, integrated boost + SEPIC converter, 300 kHz to 2.2 MHz programmable switching frequency, and dedicated current-sink regulation. The HTSSOP-20 PowerPAD package provides a thermal resistance low enough to handle the internal converter losses, while the four parallel current sinks allow paralleling of strings for higher currents (up to 400 mP per device). The low-EMI architecture (with spread-spectrum option on the switching frequency) eliminates many of the input-filter trade-offs typical of high-power LED drivers.
From an architectural perspective, the TPS61194 uses a peak-current-mode control boost/SEPIC converter with adaptive output voltage, which automatically tracks the minimum required VOUT to keep the current sinks in regulation. The internal current references are matched within approximately 1% channel-to-channel (per TI documentation), and PWM dimming is handled through a dedicated PWM input with a high-frequency gate signal passed directly to the MOSFETs in the current sinks. Compared to discrete solutions, the integration reduces BOM count by an inductor, a switching MOSFET, a sense resistor, and an external current mirror.
Typical applications for the TPS61194PWPR include LCD backlighting for automotive infotainment displays, industrial HMI panels, RGB LED signage, and small to medium-size LED matrix panels. The wide VIN tolerance makes the part a natural fit for 12 V and 24 V nominal supplies where load-dump transients must be tolerated without brownout.
When designing with the TPS61194, the most common pitfall is undersizing the output capacitor bank of the integrated boost converter - the adaptive VOUT control needs sufficient bulk capacitance to handle PWM dimming transitions without flicker. A second consideration is layout: the thermal pad on the HTSSOP-20 package must be soldered to a sufficiently large copper pour to keep junction temperature within the -40 C to +85 C operating range.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for TPS61194PWPR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TPS61194PWPR (same form factor and footprint) — differing in Dimming Method, MSL Level, Operating Temperature Range, Package, Switching Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS61194PWPRQ1
✅ Drop-In✓ In Stock
$1.72 / Unit
View Datasheet →TPS61194PWPRG4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS61194EVM-571
✅ Drop-In📋 Reference alternative (not in catalog)
TPS61196PWPR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS61193PWPR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS61194PWPR Maximum Ratings & Electrical Characteristics
| Topology | Boost / SEPIC |
| Number of LED Channels | 4 |
| Input Voltage Range | 4.5 V to 40 V |
| Per-Channel Output Current | 100 mA (channels parallelable up to 400 mA) |
| Switching Frequency | 300 kHz to 2.2 MHz (programmable) |
| Dimming Method | PWM |
| Number of Outputs | 4 |
| Operating Temperature Range | -40 C to +85 C |
| Package | 20-pin HTSSOP (PWP) with PowerPAD |
| Mounting Type | Surface Mount |
| MSL Level | 2 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Automotive Qualified | TPS61194PWPRQ1 variant - AEC-Q100 |
| Spread-Spectrum EMI Reduction | Yes (low-EMI architecture) |
TPS61194PWPR Pin Configuration
| Pin 1 | VIN — Input supply voltage (4.5 V to 40 V) |
| Pin 2 | EN — Enable input (active high) |
| Pin 3 | PWM1 — PWM dimming input for channel 1 |
| Pin 4 | PWM2 — PWM dimming input for channel 2 |
| Pin 5 | PWM3 — PWM dimming input for channel 3 |
| Pin 6 | PWM4 — PWM dimming input for channel 4 |
| Pin 7 | FS — Frequency selection / spread spectrum enable |
| Pin 8 | RT — Switching frequency programming resistor |
| Pin 9 | COMP — Loop compensation node |
| Pin 10 | FB — Boost output voltage feedback |
| Pin 11 | AGND — Analog ground |
| Pin 12 | PGND — Power ground |
| Pin 13 | SW — Boost/SEPIC switch node |
| Pin 14 | BST — Bootstrap capacitor for gate driver |
| Pin 15 | ISET — Current set reference |
| Pin 16 | IOUT1 — Current sink output 1 |
| Pin 17 | IOUT2 — Current sink output 2 |
| Pin 18 | IOUT3 — Current sink output 3 |
| Pin 19 | IOUT4 — Current sink output 4 |
| Pin 20 | VOUT — Boost converter output |
Typical Applications
TPS61194PWPR is suitable for 6 applications: Automotive Infotainment LCD Backlight, Industrial HMI Panel Backlight, RGB LED Signage and Architectural Lighting, Small to Medium LED Matrix Panel, Portable Medical Display Backlight, Automotive Cluster and HUD Backlight.
Automotive Infotainment LCD Backlight
The TPS61194PWPR is well-suited for automotive infotainment LCD backlighting where 4 channels of matched current drive at up to 100 mA each are needed from a 12 V / 24 V nominal supply. Its 4.5 V-40 V wide VIN tolerates automotive load-dump transients (per ISO 7637-2) without additional protection circuitry. The integrated boost converter with adaptive VOUT control minimizes power dissipation while the spread-spectrum low-EMI architecture eases CISPR 25 Class 5 compliance. Placed between the battery rail and the backlight LED strings with one PWM signal per channel, the TPS61194PWPR delivers up to 400 mA total current and 1% channel-to-channel matching for uniform panel brightness across the display.
Recommended
Industrial HMI Panel Backlight
Industrial HMI panels require robust multi-channel LED drivers that operate reliably from 24 V industrial buses with high immunity to conducted and radiated noise. The TPS61194PWPR's 4.5 V-40 V VIN tolerance and low-EMI architecture fit this requirement directly. Each of its four current sinks drives up to 100 mA, supporting backlight LED strings for 5-inch to 12-inch industrial LCDs. The integrated boost + SEPIC topology supports both step-up configurations (single-string LEDs) and SEPIC (where VIN may exceed VOUT during transients). Compared to discrete solutions, the TPS61194 reduces BOM count by integrating the switching MOSFET, current references, and PWM dimming logic into a single HTSSOP-20 IC.
Recommended
RGB LED Signage and Architectural Lighting
RGB signage and architectural lighting demand precise per-channel current control for consistent color mixing across many LED strings. The TPS61194PWPR's four precision current sinks (1% matching typical) drive red, green, blue, and white channels independently, with PWM dimming inputs for color/brightness control. The wide VIN range (4.5 V to 40 V) supports 12 V and 24 V LED installations directly, while the SEPIC topology allows VIN to exceed LED string voltage without damage. The integrated current sinks can be paralleled for higher current per color, supporting high-brightness RGBW fixtures. Spread-spectrum frequency modulation reduces EMI in dense LED installations where many drivers may coexist on the same PCB.
Recommended
Small to Medium LED Matrix Panel
For LED matrix panels used in industrial status indicators and small message boards, the TPS61194PWPR provides four independently controlled high-current channels that can be paralleled into two or one string for higher per-string current. The integrated boost converter eliminates the need for an external switching regulator, reducing PCB area and BOM cost. Programmable switching frequency (300 kHz to 2.2 MHz) allows designers to trade off efficiency vs inductor size. The HTSSOP-20 PowerPAD package dissipates heat efficiently, supporting continuous operation at 400 mA total output in compact panels. PWM dimming enables smooth brightness transitions without visible flicker.
Recommended
Portable Medical Display Backlight
Portable medical displays need clean, stable backlight power to maintain diagnostic accuracy. The TPS61194PWPR's integrated low-noise DC-DC converter and PWM dimming deliver flicker-free backlight operation critical for medical imaging. The 4.5 V minimum VIN supports direct operation from a single Li-ion cell (3.0 V-4.2 V range with boost topology), while the SEPIC option supports higher-VIN medical-cart installations. Four matched current sinks drive the display backlight with consistent brightness across the viewing area. The HTSSOP-20 package (4.40 mm wide) fits within the tight mechanical envelope of handheld diagnostic devices, and the low quiescent current extends battery runtime during standby.
Recommended
Automotive Cluster and HUD Backlight
The TPS61194PWPR is an excellent fit for automotive instrument cluster and head-up display (HUD) backlighting, where uniform brightness and high reliability across temperature extremes are required. Its AEC-Q100-qualified sibling (TPS61194PWPRQ1) ensures automotive-grade reliability, while the wide operating temperature range (-40 C to +85 C) handles under-dash thermal stress. Four matched channels drive the cluster backlight with 1% current matching, and the integrated boost + SEPIC converter provides flexible supply options. PWM dimming allows seamless integration with ambient-light sensors for automatic brightness adjustment, while the spread-spectrum low-EMI architecture simplifies EMC compliance for the densely-packed automotive cluster environment.
Recommended
Recommended Products Summary
Engineering reference data for TPS61194PWPR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS61194PWPRQ1 | TPS61194PWPRG4 | TPS61194EVM-571 | TPS61196PWPR | TPS61193PWPR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-HTSSOP (PWP) PowerPAD | 20-HTSSOP (PWP) PowerPAD - same | 20-HTSSOP (PWP) PowerPAD - same | EVM with HTSSOP-20 footprint | 20-HTSSOP (PWP) PowerPAD - same | 20-HTSSOP (PWP) PowerPAD - same |
| Number of Channels | 4 | 4 | 4 | 4 | 6 (+25% vs TPS61194) | 3 (-25% vs TPS61194) |
| Per-Channel Current | 100 mA | 100 mA | 100 mA | 100 mA | 100 mA | 100 mA |
| Input Voltage Range | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V | 4.5 V to 40 V |
| Switching Frequency | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz | 300 kHz to 2.2 MHz |
| Topology | Boost + SEPIC | Boost + SEPIC | Boost + SEPIC | Boost + SEPIC | Boost + SEPIC | Boost + SEPIC |
| Automotive Qualified | No (industrial/consumer) | Yes (AEC-Q100) | No | EVM only | No | No |
Key Differentiators
- Widest VIN range in 4-channel HTSSOP-20 LED driver category (vs CAT4106YP-T2 (TSSOP-16, 5.5V max))
- Integrated boost + SEPIC topology (vs Discrete LED driver solutions using external MOSFETs)
- Spread-spectrum low-EMI architecture for CISPR 25 (vs Conventional LED drivers without spread spectrum)
- Drop-in AEC-Q100 sibling for automotive migration (vs TPS61194PWPRQ1 (AEC-Q100 variant))
Design Notes
Estimated: at VIN=12V, VOUT=20V (boost), IOUT_total=200mA, the TPS61194PWPR dissipates approximately P = VIN * IIN - VOUT * IOUT. With ~85% efficiency, internal losses are ~0.7W. The HTSSOP-20 PowerPAD has theta_JA of approximately 35 C/W on a 4-layer 1-oz PCB with proper copper pour, giving a 25C junction rise above ambient. For continuous 400mA output or higher VIN/VOUT differentials, increase the PowerPAD copper area to at least 1 square inch on top layer with thermal vias to inner planes.
Place the input bypass capacitor (1 uF X7R minimum, 4.7 uF recommended) directly at the VIN pin with a short trace to PGND. The boost converter output capacitor (4.7 uF to 22 uF X7R) must be close to the VOUT pin with a wide ground return to minimize switching-node ringing. Route the SW node with minimum loop area to reduce EMI; avoid running PWM traces parallel to SW. Solder the exposed PowerPAD to a top-layer copper pour of at least 0.5 sq inch with 5+ thermal vias to inner ground planes for proper heat extraction.
Do not exceed the absolute-maximum VIN rating of 40 V - automotive load-dump events can spike above this, so add a TVS clamp or input protection MOSFET for 24 V battery systems. Do not leave the EN pin floating - tie it to VIN through a 100 kohm resistor or drive it directly from a GPIO. The PWM dimming inputs must not exceed the absolute-maximum rating of VOUT+0.3V; if VOUT exceeds the GPIO voltage, add a level shifter. Use the FS pin correctly to enable/disable spread-spectrum EMI reduction - improper FS configuration can cause unexpected frequency jitter in CISPR testing.
Separate the analog ground (AGND, pin 11) and power ground (PGND, pin 12) at the IC, then join them at a single point under the PowerPAD to avoid ground bounce coupling into the current-sink references. Route the four current-sink outputs (IOUT1-IOUT4) with symmetric trace widths and lengths to maintain channel-to-channel current matching. Place the RT resistor as close to the RT pin as possible to avoid frequency programming errors. The bootstrap capacitor (BST) must be a 0.1 uF X7R placed within 2 mm of the BST and SW pins.
The TPS61194PWPR includes spread-spectrum frequency modulation to reduce peak EMI emissions by dithering the switching frequency. For best EMI performance in CISPR 25 Class 5 testing, enable spread-spectrum mode via the FS pin and use a switching frequency above 1.5 MHz to push harmonics above the AM band. Add a common-mode choke on the input supply lines and a small ferrite bead on the VOUT rail if additional filtering is required. The internal adaptive VOUT control also minimizes VOUT-VLED headroom, reducing switching-node ringing amplitude and radiated EMI.
Compliance Information
TPS61194PWPR is RoHS/REACH compliant and lead-free per TI product page. Standard variant is not AEC-Q100 qualified - use TPS61194PWPRQ1 for automotive applications. MSL Level 2 per JEDEC J-STD-020.
