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Analog Devices Inc. LT1947EMSE#TRPBF
- Part No.:
- LT1947EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1947EMSE#TRPBF.pdf
- Description:
- IC REG CONV TFT LCD 3OUT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,839
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Product details
Overview
LT1947EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output TFT-LCD bias generator IC integrating two adjustable switching regulators and a charge-pump negative rail generator. It delivers AVDD (up to 30V/200mA), VON (up to 30V/10mA, externally delayed), and VOFF (–8V/10mA) from a 2.7V–8V input, operating at 3MHz with all-ceramic passive support. It targets notebook and desktop LCD panel power management.
For engineers reviewing the LT1947EMSE#TRPBF datasheet, LT1947EMSE#TRPBF pinout, LT1947EMSE#TRPBF application, or LT1947EMSE#TRPBF equivalent, key selection criteria include its dual-current-limited switchers (1.1A SW1 / 0.35A SW2), programmable VON delay via CT pin, 10-lead thermally enhanced MSOP package with exposed ground pad, and guaranteed –40°C to 85°C operation.
Technical Context
The LT1947EMSE#TRPBF implements two independent current-mode DC/DC boost regulators sharing a 1.26V internal reference: SW1 drives AVDD with 1.1A switch and adjustable output up to 30V; SW2 generates VO2 (fed to high-side switch Q3) for VON with 350mA limit. A charge pump derived from SW1 node produces VOFF without external inductors.
Its 3MHz fixed-frequency oscillator enables compact magnetics and low-profile ceramic capacitors. An external capacitor on CT pin sets VON turn-on delay after AVDD stabilization; internal 5.5µA current source and 1.28V threshold define timing. Undervoltage lockout disables operation below ~2.7V VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 8V - supports single-cell Li-ion, 3.3V, and 5V system rails without pre-regulation. |
| AVDD Output Capability | Adjustable up to 30V @ 200mA - powers TFT source driver ICs requiring high positive bias. |
| VON Output Capability | Adjustable up to 30V @ 10mA with programmable delay - provides gate-on voltage with controlled sequencing relative to AVDD. |
| VOFF Output | –8V @ 10mA generated by internal charge pump - eliminates need for separate negative supply in LCD bias chains. |
| Switching Frequency | 3MHz (typical) - enables use of sub-5mm chip inductors and <1.2mm-height ceramic capacitors for ultra-thin displays. |
| Package | 10-Lead MSOP with exposed thermal pad (Pin 11 = GND) - θJA = 40°C/W improves thermal performance in space-constrained LCD modules. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and commercial display environments including notebooks and handhelds. |
Pinout & Package
LT1947EMSE#TRPBF uses a 10-lead plastic MSOP package with an exposed thermal pad (Pin 11, GND), requiring soldering to PCB ground plane for thermal and electrical integrity. Package dimensions: 3.0mm × 3.0mm × 1.1mm height, 0.5mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 (Pin 1) | AVDD Feedback Input | Connects to resistor divider to set AVDD output voltage per VAVDD = 1.26V(1 + R1/R2); precision 1.26V reference enables ±1% output regulation. |
| FB2 (Pin 2) | VON Feedback Input | Sets VON voltage via second resistor divider; includes 160mV offset compensation for Q3 switch drop in feedback equation. |
| CT (Pin 3) | Delay Timing Capacitor Node | Accepts external capacitor (e.g., 10nF) to program VON turn-on delay (tDELAY ≈ (5.5µA × C)/1.28V); critical for LCD panel power sequencing. |
| SW1 (Pin 4) | AVDD Switch Node | High dv/dt node connecting to L1 and D1; requires minimized trace area to reduce EMI and switching losses. |
| GND (Pin 5) | Analog/Digital Ground | Primary ground reference; must connect directly to local ground plane to maintain feedback accuracy and noise immunity. |
| VIN (Pin 6) | Main Input Supply | 2.7V–8V input; requires local 2.2µF ceramic bypass capacitor placed adjacent to pin for stable operation. |
| SW2 (Pin 7) | VO2 Switch Node | Drives second boost stage; connects to L2 and D2; same EMI-sensitive layout rules apply as SW1. |
| SHDN (Pin 8) | Shutdown Control | Active-high logic input; ≥2.4V enables operation, ≤0.4V forces shutdown with 1µA quiescent current. |
| VO2 (Pin 9) | Second Boost Output | Internal connection point to emitter of Q3 (high-side switch); feeds VON after CT timer expires. |
| VON (Pin 10) | Delayed Positive Bias Output | Final regulated output for gate-on voltage; enabled only after CT capacitor charges to 1.28V, ensuring AVDD stability first. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent boost regulators | SW1 (1.1A, AVDD) and SW2 (0.35A, VO2/VON) operate with separate feedback loops and current limits-enables flexible bias rail generation without cross-regulation. |
| Integrated charge-pump VOFF generator | Derives –8V negative rail directly from SW1 node-eliminates need for third inductor, reducing BOM count and board area in LCD power solutions. |
| Externally programmable VON delay | CT pin allows precise timing control (e.g., 2.3ms with 10nF) between AVDD stabilization and VON activation-prevents LCD panel latch-up during power-up. |
| All-ceramic component support | 3MHz switching frequency permits full use of low-ESR ceramic capacitors and miniature chip inductors-achieves total solution height under 1.2mm for slim displays. |
| Thermally enhanced MSE package | Exposed GND pad reduces θJA to 40°C/W-maintains safe junction temperature (<125°C) at full load in compact LCD module layouts. |
Applications
| TFT-LCD Notebook Display Panels | TFT-LCD Desktop Monitor Display Panels |
|---|---|
|
Use Scenario: Powering active-matrix LCD panels in ultraportable laptops where thickness and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Generates AVDD (8V/200mA), VON (24V/10mA), and VOFF (–8V/10mA) with sequenced startup to meet panel vendor power-on timing requirements. Use Value: Single-chip solution replaces discrete boost converters and charge pumps, reducing component count by >40% and enabling sub-1.2mm profile designs. |
Use Scenario: Biasing large-format TFT panels in desktop monitors requiring stable, low-noise positive and negative rails. IC Role / Device Role / Timing Role: Delivers regulated AVDD (10V/150mA), VON (24V/10mA), and VOFF (–6V/10mA) with fast transient response to handle dynamic backlight and image content changes. Use Value: 3MHz operation minimizes conducted EMI into sensitive video signal paths, improving display image fidelity and EMC compliance. |
| Digital Cameras | Handheld Computers |
|
Use Scenario: Providing compact, efficient bias for small high-resolution LCD viewfinders and rear screens in DSLR and mirrorless cameras. IC Role / Device Role / Timing Role: Supplies AVDD (7.5V/200mA), VON (15V/10mA), and VOFF (–10V/20mA) from a 3.3V battery rail with soft-start to prevent camera boot glitches. Use Value: Ultra-low quiescent current (12.5mA active, 1µA shutdown) extends battery life; all-ceramic design withstands mechanical shock and vibration. |
Use Scenario: Powering display bias in ruggedized handhelds used in field service, logistics, or medical applications. IC Role / Device Role / Timing Role: Generates AVDD (12V/120mA), VON (20V/10mA), and VOFF (–6V/20mA) across –40°C to +85°C ambient with no derating. Use Value: Guaranteed industrial temperature range and exposed-pad thermal design ensure reliable operation in uncontrolled thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TFT-LCD bias generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1945EMS#TRPBF | Dual-output (±34V max), 350mA per switch, no integrated VOFF charge pump; requires external inverter for negative rail. | Lacks monolithic VOFF generation-increases BOM and layout complexity for full three-rail LCD systems. | Choose when higher negative voltage (>–8V) or independent negative rail control is required; not a drop-in replacement for LT1947EMSE#TRPBF. |
| LT1944EMS#TRPBF | Dual-output (34V max), 350mA per switch, no VOFF generation or VON delay function; simpler architecture. | Cannot replace LT1947EMSE#TRPBF in applications requiring sequenced VON or integrated negative bias. | Select for cost-sensitive dual-rail designs where VOFF is generated separately and timing control is unnecessary. |
Compared with LT1947EMSE#TRPBF, LT1945EMS#TRPBF offers higher voltage flexibility but adds design overhead for VOFF, while LT1944EMS#TRPBF reduces integration at the expense of missing critical LCD-specific features like VON delay and charge-pump VOFF-making LT1947EMSE#TRPBF the optimal choice for complete, space-constrained three-rail LCD biasing.
Availability
LT1947EMSE#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD notebook display panels, digital cameras, handheld computers, and desktop monitor display panels requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LT1947EMSE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LT1947EMSE#TRPBF belongs to Linear's legacy TFT-LCD power management IC family, engineered specifically to integrate AVDD, VON, and VOFF generation into a single compact package for space- and efficiency-critical display applications.
FAQ
What is the maximum output voltage capability of the LT1947EMSE#TRPBF for AVDD and VON rails?
The LT1947EMSE#TRPBF supports adjustable AVDD and VON outputs up to 30V each, as confirmed by absolute maximum ratings (VON, VO2 voltage = 30V) and typical application circuits achieving 24V and 15V outputs. This headroom accommodates panel-specific bias requirements across notebook, monitor, and camera displays while maintaining regulation under load and temperature variation.
How is the VON turn-on delay programmed on the LT1947EMSE#TRPBF?
The VON turn-on delay on the LT1947EMSE#TRPBF is set by an external capacitor connected between CT (Pin 3) and GND. A 10nF capacitor yields ~2.3ms delay, calculated using C = (5.5µA × tDELAY)/1.28V. This delay ensures AVDD reaches regulation before VON activates, preventing LCD panel malfunction during power-up sequences.
Does the LT1947EMSE#TRPBF require external diodes or inductors for all three outputs?
Yes-the LT1947EMSE#TRPBF requires two external inductors (L1 for AVDD, L2 for VO2/VON) and four external diodes (D1–D4) as shown in Figure 1. However, the VOFF output is generated by an internal charge pump, eliminating the need for a third inductor or dedicated negative converter, simplifying the overall bias solution.
What is the thermal performance advantage of the MSE package used in the LT1947EMSE#TRPBF?
The LT1947EMSE#TRPBF's MSE package features an exposed ground pad (Pin 11) that must be soldered to the PCB. This reduces thermal resistance to θJA = 40°C/W-versus 120°C/W for the standard MSOP-enabling reliable operation at full 200mA AVDD load in thermally constrained LCD module assemblies without additional heatsinking.
Can the LT1947EMSE#TRPBF operate from a 3.3V input supply?
Yes-the LT1947EMSE#TRPBF operates over a 2.7V to 8V input range, and all typical performance data (efficiency curves, waveforms, and application circuits) are specified at VIN = 3.3V. It delivers full AVDD (8V/200mA), VON (24V/10mA), and VOFF (–8V/10mA) functionality from this rail, making it ideal for systems powered by regulated 3.3V supplies.
LT1947EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, TFT LCD
- Voltage - Input:
- 2.7V ~ 8V
- Number of Outputs:
- 3
- Voltage - Output:
- Adj up to 30V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT1947EMSE#TRPBF FAQ
1.How can I place an order for LT1947EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1947EMSE#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 LT1947EMSE#TRPBF reliable?
The price and inventory of LT1947EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1947EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1947EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1947EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1947EMSE#TRPBF?
LT1947EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1947EMSE#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 LT1947EMSE#TRPBF?
For technical support, including LT1947EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1947EMSE#TRPBF requirements.
6.How does Aetrix verify that LT1947EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1947EMSE#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 LT1947EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1947EMSE#TRPBF?
All LT1947EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1947EMSE#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 LT1947EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT1947EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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