My Inquiry
My Account
Analog Devices Inc. LTC3230EUD#TRPBF
- Part No.:
- LTC3230EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3230EUD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 25MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,185
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3230EUD#TRPBF from Analog Devices (formerly Linear Technology) is a low-noise, multimode charge pump LED driver with dual 200mA LDOs, designed to power four 25mA main LEDs and one 25mA sub LED in portable displays. It features automatic 1x/1.5x/2x mode switching, single-resistor full-scale current programming (RSET = 17.4kΩ → 25.5mA), and integrated open/short LED protection - deployed in cell phone main/sub display backlighting.
For engineers reviewing the LTC3230EUD#TRPBF datasheet, LTC3230EUD#TRPBF pinout, LTC3230EUD#TRPBF application, or LTC3230EUD#TRPBF equivalent, key selection criteria include CPO output impedance in 1.5x/2x modes (7.9Ω / 9.2Ω), LDO1/LDO2 tri-level voltage select (1.2V/1.5V/1.8V and 1.8V/2.8V/3.3V), shutdown current (3μA), soft-start timing (250μs enable), and LED current matching (±0.5% at full scale).
Technical Context
The LTC3230EUD#TRPBF implements a 900kHz fixed-frequency, non-overlapping 2-phase charge pump with automatic dropout-driven mode transitions: starts in 1x (VIN→CPO), switches to 1.5x (target 4.5V) upon MLED/SLED dropout detection (≤100mV), then to 2x (target 5.0V). Regulation uses internal error amplifiers sensing CPO voltage against mode-specific thresholds.
LED current control employs two independent 5-bit linear DACs - one for MLED1–4 (ENM strobed), one for SLED (ENS strobed) - each offering 32 linear steps (FS down to FS/31 = 0.86mA) with 150μs settling. Dual LDOs operate independently with separate ENLDO1/ENLDO2 enables and V1/V2 tri-level selects, drawing 125μA bias (LDO1 only) or +60μA per enabled LDO when charge pump is active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Operating Range | 2.7V to 5.5V - supports single-cell Li-ion (3.0–4.2V) and USB-powered systems without external regulation. |
| CPO Output Modes | 1x (VIN), 1.5x (4.5V max), 2x (5.0V max) - auto-switched based on real-time LED dropout voltage; enables efficient operation across varying VF and temperature. |
| Main/Sub LED Current | 4 × 25mA MLED + 1 × 25mA SLED - full-scale set by RSET = 17.4kΩ; 32-step linear brightness control via ENM/ENS strobes. |
| LDO Outputs | Dual 200mA LDOs: LDO1 (1.2/1.5/1.8V), LDO2 (1.8/2.8/3.3V) - independently enabled, with ±3% output accuracy and 250mV dropout (LDO2 @ 3.3V). |
| Shutdown Current | 3μA - achieved when ENM, ENS, ENLDO1, ENLDO2 all low; ensures battery longevity in standby. |
| Package | 20-lead 3mm × 3mm QFN (0.75mm height) with exposed thermal pad - optimized for compact handheld PCB layouts and thermal dissipation. |
| Charge Pump Efficiency | Up to 90% at VIN = 3.6V, 5 LEDs @ 25mA each (VF = 3.45V) - enabled by low-RDS(on) internal switches and minimal flying capacitor losses. |
Pinout & Package
Package: 20-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 21 = GND), 0.75mm profile. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPO (1) | Charge pump output node | Supplies anode-side power to all LEDs; voltage dynamically regulated to 1x/1.5x/2x VIN; requires 1μF ceramic to GND. |
| ENLDO1, ENLDO2 (2,3) | LDO enable inputs | Logic-high enables respective LDO; internal pull-downs ensure safe default-off state during power-up or floating conditions. |
| RSET (4) | LED current reference input | Serves 0.8V internal reference; sets full-scale MLED/SLED current via external resistor (e.g., 17.4kΩ → 25.5mA). |
| ENS, ENM (5,11) | Sub/Main LED current DAC controls | Strobe pulses decrement 5-bit linear DACs; 31 pulses reduce current from FS to FS/31 (0.86mA); 150μs settling required. |
| SLED (6), MLED1–4 (7–10) | LED cathode current sinks | Low-dropout (100mV typ.) constant-current outputs; any MLED can be disabled by shorting to CPO (100μA leakage). |
| V1, V2 (12,13) | LDO output voltage select | Tie to GND/FLOAT/VIN to configure LDO1 (1.2/1.5/1.8V) and LDO2 (1.8/2.8/3.3V); no external resistors needed. |
| LDO1, LDO2 (14,15) | LDO regulated outputs | 200mA capable; bypass with 1μF X5R/X7R ceramic; internal soft-start limits output slew rate (~100μs). |
| C1P/C1M, C2P/C2M (16,17,19,20) | Flying capacitor connections | Two independent 1μF ceramic caps required; polarity-insensitive; must be placed adjacent to IC for low-loop inductance. |
| VIN (18) | Main supply input | Input for charge pump and LDO bias; requires ≥2.2μF low-ESR ceramic bypass close to pin. |
| GND (21, Exposed Pad) | Power and signal ground | Exposed thermal pad is functional GND; mandatory connection to solid ground plane via multiple vias for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic multimode charge pump | Eliminates manual mode selection; 1x→1.5x→2x transition occurs within 0.5ms of dropout detection, maintaining LED brightness across battery discharge. |
| Single-wire LED brightness control | ENM/ENS strobing enables precise 32-step linear dimming without I²C/SPI interface - reduces BOM count and firmware overhead in resource-constrained devices. |
| Dual independent LDOs with tri-level select | Provides flexible system rail generation (e.g., 1.8V core + 2.8V camera sensor) without external feedback resistors or regulators - simplifies layout and improves accuracy. |
| Integrated open/short LED protection | Monitors MLED/SLED pins vs CPO; disables affected current source and flags fault condition - prevents thermal runaway and system instability during LED failure. |
| No-inductor architecture | Enables ultra-thin, EMI-quiet designs using only ceramic capacitors; avoids inductor size, cost, saturation, and magnetic coupling issues common in boost converters. |
Applications
| Cell Phone Main/Sub Display Backlight | Digital Camera LCD Viewfinder |
|---|---|
Use Scenario: Driving 4 white main LEDs (for primary display) and 1 amber sub LED (for status indicator) from a single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Charge pump LED driver with dual LDOs supplies regulated LED current and auxiliary system rails (e.g., 1.8V image processor core, 2.8V CCD sensor). Use Value: Maintains consistent brightness across battery discharge via automatic 1x/1.5x/2x mode switching; eliminates need for discrete LDOs or boost converters. |
Use Scenario: Powering high-brightness viewfinder LCD in compact digital cameras where board space and EMI are critical constraints. IC Role / Device Role / Timing Role: Provides low-noise, constant-current LED drive and clean 3.3V LDO2 rail for analog front-end circuitry while rejecting switching noise from charge pump. Use Value: Achieves <10mVpp CPO ripple in 2x mode due to dual-phase operation - prevents visible flicker and analog signal corruption in sensitive imaging paths. |
| PDA System Power Management | Portable Navigation Device (PND) UI Lighting |
Use Scenario: Consolidating backlight and logic rail generation in legacy PDA platforms with tight thermal budgets and aging battery packs. IC Role / Device Role / Timing Role: Delivers 25mA × 5 LEDs plus 200mA @ 1.5V (LDO1) and 200mA @ 3.3V (LDO2) from 3.3V nominal input, with 3μA shutdown current extending standby life. Use Value: Reduces component count by replacing three discrete regulators; exposed-pad QFN package enables direct thermal coupling to metal chassis for passive cooling. |
Use Scenario: Illuminating high-contrast automotive-grade UI displays in PNDs operating across –40°C to +85°C ambient range. IC Role / Device Role / Timing Role: LED driver with guaranteed performance over full industrial temperature range; LDOs maintain ±3% output accuracy and 250mV dropout even at –40°C. Use Value: Ensures reliable backlight operation during cold cranking (low VIN transients) and hot parking lot conditions (high junction temp), validated per datasheet specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver and dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-output boost LED driver (no LDOs); 1.2MHz switching; requires external current sense resistor; no multimode auto-switching. | Only drives main LEDs; external LDOs needed for auxiliary rails; less integrated for multi-rail systems. | Choose when only LED driving is required and board space allows discrete LDOs. |
| MAX16832ATP+ | High-voltage boost controller (up to 36V); supports external MOSFETs; no integrated LDOs; analog/digital dimming only. | Targeted at automotive LED lighting (headlamps, DRLs); not qualified for portable battery-operated devices. | Choose for high-power, high-VF LED strings beyond 5V, not for compact consumer display applications. |
Compared with TPS61165DRVR and MAX16832ATP+, the LTC3230EUD#TRPBF uniquely integrates multimode charge pump, 5-channel LED current sinks, and dual programmable LDOs in a single 3mm × 3mm QFN - reducing total solution size by >40% and eliminating six external components versus discrete alternatives.
Availability
LTC3230EUD#TRPBF is available at Aetrix Electronics and suitable for cell phone display backlighting, digital camera viewfinder power, and portable navigation device UI lighting requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3230EUD#TRPBF 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
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3230 belongs to Linear's legacy high-efficiency, low-noise portable power management product line - engineered specifically for space-constrained, battery-powered consumer electronics requiring integrated LED backlighting and auxiliary rail generation.
FAQ
What is the maximum total LED current supported by the LTC3230EUD#TRPBF?
The LTC3230EUD#TRPBF supports up to 125mA total LED current: four 25mA main LED current sources (MLED1–4) and one 25mA sub LED current source (SLED). Each current source maintains ±0.5% matching at full scale and operates with ≤100mV dropout voltage, enabling efficient use of low-VF LEDs across the full input voltage range.
How does the LTC3230EUD#TRPBF achieve automatic mode switching between 1x, 1.5x, and 2x charge pump operation?
The LTC3230EUD#TRPBF monitors voltage headroom at each MLED and SLED pin relative to CPO. When any current source approaches dropout (≤100mV), it triggers a 0.5ms mode transition: from 1x (direct VIN pass-through) to 1.5x (target 4.5V) or 2x (target 5.0V). The charge pump resets to 1x mode upon ENM/ENS low assertion or shutdown, ensuring optimal efficiency at all load and input conditions.
Can the LDO outputs of the LTC3230EUD#TRPBF be used independently of the LED driver function?
Yes - LDO1 and LDO2 operate fully independently of the charge pump and LED drivers. ENLDO1 and ENLDO2 pins enable each regulator separately; V1 and V2 pins configure output voltages (1.2/1.5/1.8V for LDO1, 1.8/2.8/3.3V for LDO2) without affecting LED operation. Each LDO draws only 125μA (LDO1 alone) or +60μA (second enabled LDO) when the charge pump is inactive.
What is the purpose of the RSET pin on the LTC3230EUD#TRPBF, and what resistor value sets 25mA full-scale current?
The RSET pin serves as the reference node for the internal 0.8V bandgap, setting full-scale LED current via IFS = 0.8V × 555 / RSET. A 17.4kΩ resistor yields 25.5mA (0.8V × 555 / 17.4kΩ), matching the datasheet typical value for MLED/SLED full-scale operation. RSET must be connected to GND with minimal trace length to avoid noise-induced current errors.
Does the LTC3230EUD#TRPBF include protection features, and how do they operate?
Yes - the LTC3230EUD#TRPBF integrates open-LED and short-LED detection on all MLED and SLED pins. If a LED opens, the corresponding current source shuts off and CPO voltage rises; if shorted, the pin voltage collapses toward GND. Both conditions trigger automatic current source disable and flag a fault state, preventing thermal damage and maintaining system stability without external monitoring circuitry.
LTC3230EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- 900kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
LTC3230EUD#TRPBF FAQ
1.How can I place an order for LTC3230EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3230EUD#TRPBF 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 LTC3230EUD#TRPBF reliable?
The price and inventory of LTC3230EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3230EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3230EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3230EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3230EUD#TRPBF?
LTC3230EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3230EUD#TRPBF 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 LTC3230EUD#TRPBF?
For technical support, including LTC3230EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3230EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3230EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3230EUD#TRPBF 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 LTC3230EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3230EUD#TRPBF?
All LTC3230EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3230EUD#TRPBF, 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 LTC3230EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3230EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3230EUD#TRPBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
