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Analog Devices Inc. LTC3450EUD#TRPBF
- Part No.:
- LTC3450EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3450EUD#TRPBF.pdf
- Description:
- IC REG CONV TFT LCD 3OUT 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,181
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Product details
Overview
LTC3450EUD#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output TFT-LCD power supply IC integrating a synchronous boost converter and three charge pumps. It delivers 5.1V/10mA, ±10V or ±15V/500µA, and 15V/500µA from 1.5V–4.6V input, with controlled power-up sequencing (AVDD → VGL → VGH), <2µA shutdown current, and 90%+ efficiency - used in compact color display modules for handheld instrumentation.
For engineers reviewing the LTC3450EUD#TRPBF datasheet, LTC3450EUD#TRPBF pinout, LTC3450EUD#TRPBF application, or LTC3450EUD#TRPBF equivalent, key selection criteria include output voltage configuration (VINV-selectable negative rail), blank/scan mode frequency reduction, soft-start via SHDN RC network, and QFN-16 thermal pad connection to VNEG.
Technical Context
The LTC3450EUD#TRPBF employs a fixed-frequency (550kHz nominal), current-mode synchronous boost regulator to generate AVDD (5.1V), which feeds three open-loop, frequency-synchronized charge pumps: a doubler (V2X = 10.2V), tripler (V3X = 15.3V), and inverter (VNEG = –5V/–10V/–15V). All outputs are internally sequenced with precise timing delays (1ms, 4ms) to prevent LCD panel latch-up.
It supports dual operating modes: SCAN mode (full performance, 75µA quiescent) and BLANK mode (reduced 15.62kHz boost frequency, ~30µA quiescent), with MODE pin control. Shutdown (SHDN) actively discharges all outputs and reduces VIN current to <2µA, while soft-start is implemented externally via resistor/capacitor on SHDN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 4.6V - supports single Li-ion or 2–3 alkaline cells without external regulation. |
| AVDD Output | 5.100V ±1%, 10mA - low-noise, high-efficiency main bias rail for TFT source drivers. |
| V2X Output | 10.1V ±3%, 500µA - charge pump doubler output for gate-on voltage (VGH) scaling. |
| V3X Output | 15.2V ±3%, 500µA - charge pump tripler output for high-voltage VGH generation. |
| VNEG Output | –10.1V ±3%, 500µA - inverter output selectable to –5V/–10V/–15V via VINV pin connection. |
| Quiescent Current (SCAN) | 75µA typical - enables ultra-low power operation during active display scanning. |
| Shutdown Current | <2µA - ensures rapid battery preservation when display is off. |
| Switching Frequency | 550kHz (SCAN), 15.62kHz (BLANK) - reduces EMI and improves light-load efficiency in standby. |
Pinout & Package
Package: 3mm × 3mm, 16-pin plastic QFN (UD package) with exposed thermal pad connected to VNEG (Pin 3); height 0.75mm - optimized for thin handheld display assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C3+ | Inverter flying capacitor positive node | AC-coupled switching node between GND and VINV; requires ≥10nF X5R ceramic capacitor. |
| C3− | Inverter flying capacitor negative node | AC-coupled switching node between GND and VNEG; critical for stable –5V/–10V/–15V generation. |
| VNEG | Negative output rail | Configurable –5V/–10V/–15V output; exposed pad must be soldered to this pin for thermal and electrical integrity. |
| MODE | Power mode select | High = SCAN (550kHz, full current); Low = BLANK (15.62kHz, reduced load capability); must be pulled up at startup. |
| SHDN | Master shutdown control | Active-low; discharges all outputs and cuts VIN current to <2µA; RC network enables soft-start ramp. |
| VIN | Main input supply | 1.5V–4.6V input; bypassed with 2.2µF X5R capacitor to minimize noise and sag. |
| VOUT | Boost regulator output | 5.1V/10mA main rail; feeds V2X/V3X/VNEG charge pumps and serves as AVDD for LCD. |
| SW | Internal switch node | Connects to inductor; P-channel MOSFET synchronous rectifier prevents reverse inductor current. |
| GND | Signal and power ground | Common reference for all regulators; requires short, low-inductance PCB path to all output capacitors. |
| C1−, C1+ | Doubler flying capacitor nodes | Form 2× multiplier stage; C1+ switches between VOUT and V2X; C1− switches between GND and VOUT. |
| C2−, C2+ | Tripler flying capacitor nodes | Form 3× multiplier stage; C2+ switches between V2X and V3X; C2− switches between GND and VOUT. |
| V2X | Doubler output | 10.2V nominal; supplies VGH intermediate rail or VINV for –10V generation. |
| V3X | Tripler output | 15.3V nominal; primary VGH supply for small TFT-LCD panels requiring 15V gate drive. |
| VINV | Inverter positive input | Defines VNEG polarity: tied to VOUT → –5V; tied to V2X → –10V; with external diodes → –15V. |
| Exposed Pad | Thermal and electrical connection | Mandatory connection to VNEG (Pin 3); not GND - ensures thermal dissipation and output stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated triple-output architecture | Single-chip solution replaces discrete boost + three charge pumps - reduces BOM count and PCB area by >40%. |
| Controlled power-up sequencing | AVDD → VGL → VGH with 1ms/4ms internal delays - prevents LCD panel damage during cold start. |
| Blank/Scan dynamic frequency scaling | Reduces boost switching frequency from 550kHz to 15.62kHz in BLANK mode - cuts switching losses and EMI during display idle. |
| Active output discharge in shutdown | Internal pull-down devices rapidly discharge AVDD/VGL/VGH to GND - enables fast, glitch-free display turn-off. |
| Ultralow quiescent current | 75µA in SCAN mode, 30µA in BLANK mode - extends battery life in portable instrumentation and PDAs. |
| Low-profile 3mm × 3mm QFN package | 0.75mm height with VNEG-connected exposed pad - meets mechanical constraints of sub-10mm-thick handheld displays. |
Applications
| Handheld Instrumentation Power Supply | Color PDA Display Bias |
|---|---|
Use Scenario: Portable multimeters and spectrum analyzers with monochrome or color TFT-LCDs requiring stable, low-noise bias rails in space-constrained enclosures. IC Role / Device Role / Timing Role: Generates AVDD (5.1V), VGH (15V), and VGL (–10V) with strict sequencing to initialize segmented LCD drivers without latch-up. Use Value: Eliminates need for external sequencing logic and discrete regulators - reduces component count and layout complexity while maintaining <5mVP-P ripple on AVDD. |
Use Scenario: Legacy PDAs with active-matrix TFT displays powered by single-cell Li-ion batteries with limited capacity and voltage droop under load. IC Role / Device Role / Timing Role: Synchronous boost + charge pumps deliver regulated triple output from 3.0–4.2V battery range, with BLANK mode reducing current draw during screen timeout. Use Value: 90%+ efficiency across 1.5–4.6V input and ultralow 75µA quiescent current extend usable runtime by >25% versus discrete solutions. |
| Cellular Handset Sub-Display | TFT-LCD Module Reference Design |
Use Scenario: Secondary color displays in feature phones (e.g., flip-phone inner screens) where board space and thermal budget are severely constrained. IC Role / Device Role / Timing Role: Provides compact 5.1V/10mA, –10V/500µA, and 15V/500µA rails with integrated soft-start and shutdown discharge - critical for reliable hot-plug behavior. Use Value: 3mm × 3mm QFN footprint and 0.75mm profile enable direct integration into display flex assemblies - no additional heat sinking required. |
Use Scenario: OEM LCD module manufacturers building standardized 2.2″–3.5″ TFT panels for industrial HMI and medical devices. IC Role / Device Role / Timing Role: Reference power management IC with configurable VNEG (via VINV) supporting –5V, –10V, or –15V options - simplifies one-design-fits-many panel variants. Use Value: Pin-compatible support for multiple voltage configurations reduces NRE and accelerates qualification - VINV routing determines final negative rail without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT-LCD power supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3407EDHC#TRPBF | Dual-output (5V + –5V), no V3X tripler; 600mA boost current; uses external FETs. | Lacks 15V rail and internal sequencing - requires external timing circuitry for VGL/VGH startup. | Choose only if system needs higher current AVDD and can implement discrete sequencing. |
| LTC1947EFE#TRPBF | Triple-output (5V/–10V/15V) with 1.1A boost, 3MHz switching, MSOP-16 package (4.9mm × 6.0mm). | Higher profile (1.1mm) and larger footprint - unsuitable for ultra-thin handhelds; no BLANK mode frequency scaling. | Select when higher output current (up to 150mA AVDD) is required and board space permits larger package. |
Compared with LTC3407EDHC#TRPBF and LTC1947EFE#TRPBF, the LTC3450EUD#TRPBF uniquely integrates sequencing logic, BLANK/SCAN mode control, and 0.75mm QFN packaging - making it the only option meeting strict mechanical and startup-timing requirements for sub-8mm-thick color display modules.
Availability
LTC3450EUD#TRPBF is available at Aetrix Electronics and suitable for handheld instrumentation, color PDA displays, and cellular handset sub-displays requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3450EUD#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 and maintains its precision analog and power management portfolio. Linear pioneered high-efficiency, low-noise DC/DC converters for portable electronics.
The LTC3450EUD#TRPBF belongs to Linear's TFT-LCD power supply product line, designed specifically to replace multi-chip solutions in space- and battery-limited color display systems - emphasizing integration, sequencing reliability, and ultra-low quiescent current.
FAQ
What is the function of the VINV pin on the LTC3450EUD#TRPBF?
The VINV pin on the LTC3450EUD#TRPBF sets the magnitude of the negative output voltage (VNEG). When tied to VOUT (5.1V), VNEG = –5V; when tied to V2X (10.2V), VNEG = –10V; and with two external Schottky diodes, it enables –15V generation. This pin directly defines the inverter's gain ratio and must be routed with low-impedance traces to avoid regulation error in the LTC3450EUD#TRPBF.
How does the MODE pin affect efficiency and output capability of the LTC3450EUD#TRPBF?
The MODE pin on the LTC3450EUD#TRPBF selects between SCAN mode (MODE = VIN, 550kHz switching, full 10mA AVDD) and BLANK mode (MODE = GND, 15.62kHz switching, reduced load capability). In BLANK mode, the LTC3450EUD#TRPBF lowers quiescent current to ~30µA and maintains low-noise operation - ideal for display idle states where power savings outweigh peak current needs.
Can the LTC3450EUD#TRPBF generate –15V, and what external components are required?
Yes, the LTC3450EUD#TRPBF can generate –15V using two external low-current Schottky diodes (e.g., Panasonic MA704WKCT) as shown in Figure TA02 of the datasheet. VINV is connected to V3X (15.3V), and the diodes configure the inverter stage for 3× inversion. The LTC3450EUD#TRPBF itself requires no internal changes - only the external diode network and proper capacitor sizing per the application note.
What is the recommended soft-start implementation for the LTC3450EUD#TRPBF?
The LTC3450EUD#TRPBF implements soft-start via an RC network on the SHDN pin: a resistor (RSS = 1MΩ–10MΩ) and capacitor (CSS = e.g., 6.8nF) between SHDN and GND. During power-up, SHDN voltage ramps per the R•C time constant; the LTC3450EUD#TRPBF begins switching only after SHDN exceeds 0.77V, and current limit increases gradually - preventing inrush stress on the input source and inductor.
Why must the exposed thermal pad of the LTC3450EUD#TRPBF be connected to VNEG instead of GND?
The exposed pad of the LTC3450EUD#TRPBF is electrically connected to Pin 3 (VNEG) internally and must be soldered to a PCB copper area tied to VNEG - not GND - to ensure proper thermal dissipation and output stability. Connecting it to GND creates a short circuit between VNEG and ground, damaging the LTC3450EUD#TRPBF and disabling the negative rail functionality.
LTC3450EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 1.5V ~ 4.6V
- Number of Outputs:
- 3
- Voltage - Output:
- 5.1V, -5V, ±10V, ±15V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3450EUD#TRPBF FAQ
1.How can I place an order for LTC3450EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3450EUD#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 LTC3450EUD#TRPBF reliable?
The price and inventory of LTC3450EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3450EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3450EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3450EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3450EUD#TRPBF?
LTC3450EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3450EUD#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 LTC3450EUD#TRPBF?
For technical support, including LTC3450EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3450EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3450EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3450EUD#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 LTC3450EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3450EUD#TRPBF?
All LTC3450EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3450EUD#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 LTC3450EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3450EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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