My Inquiry
My Account
Analog Devices Inc. LTC1697EMS#TRPBF
- Part No.:
- LTC1697EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1697EMS#TRPBF.pdf
- Description:
- IC REG CCFL 1OUT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,854
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1697EMS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous current-mode PWM controller IC designed to drive a single 1W cold cathode fluorescent lamp (CCFL) in portable backlighting systems. It integrates 1A internal MOSFET switches, operates from 2.8V–5.5V input, delivers fixed 300kHz switching frequency, achieves <2µA shutdown current, and sets accurate lamp current (2–5mA) via external RPROG resistor.
For engineers reviewing the LTC1697EMS#TRPBF datasheet, LTC1697EMS#TRPBF pinout, LTC1697EMS#TRPBF application, or LTC1697EMS#TRPBF equivalent, this device is selected for low-power CCFL backlight control where battery life, thermal efficiency, dimming linearity, and compact MSOP-10 footprint are critical in handheld GPS, PDA, and portable instrument designs.
Technical Context
The LTC1697EMS#TRPBF implements a fixed-frequency (240–370kHz), current-mode PWM architecture with lossless peak-current sensing and internal slope compensation. Its control loop regulates average lamp current by modulating inductor current into a Royer-class transformer stage, not by direct high-voltage output regulation.
It features dual dimming control: internal PWM dimming (190–310Hz, set by CDIM capacitor) with 0–100% duty range (1V–2V on VDIM), plus optional external PWM override (150–500Hz). Overvoltage protection is implemented via OVSEN pin current threshold (16.65–26.35µA), and thermal shutdown activates at TJ = 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 5.5V - supports direct Li-ion battery operation without pre-regulation |
| Switching Frequency | 300kHz typical - enables small magnetics (e.g., 33µH inductor) and reduces EMI filtering burden |
| Lamp Current Accuracy | ±2% to ±6% - ensures consistent brightness and maximizes CCFL lifetime across temperature |
| Shutdown Current | <2µA - preserves battery charge during display-off states in portable devices |
| Dimming PWM Frequency | 250Hz typical (CDIM = 0.022µF) - avoids audible noise while enabling smooth 0–100% intensity control |
| Internal Switch RON | 0.18Ω - minimizes conduction loss in synchronous buck stage for >90% efficiency |
| Current Limit Threshold | 0.9A to 1.6A - protects internal MOSFETs during lamp fault or startup surge |
Pinout & Package
Package: 10-lead MSOP (3.0mm × 3.0mm × 1.1mm height), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CDIM (1) | Dimming Oscillator Capacitor Input | Connects to GND via 0.022µF capacitor; sets internal PWM dimming frequency per f = 5Hz/CCDIM(µF) |
| VDIM (2) | Dimming Control Voltage Input | 0–100% dimming duty cycle mapped linearly from 1.0V (0%) to 2.0V (100%); <0.4V triggers passive shutdown after ~50ms |
| 0VSEN (3) | Overvoltage Sense Input | Monitors Royer oscillator emitter voltage; disables SW output when sensed current exceeds 16.65–26.35µA to protect transformer |
| SW (4) | Power Switch Node | Drives external inductor; requires short trace routing to minimize EMI and ringing |
| GND (5) | Signal and Power Ground | Common reference for all analog and power circuits; must be low-impedance star point |
| LAMP (6) | Lamp Current Feedback | Internally connected to GND via 50–60Ω resistor; senses absolute lamp current magnitude for closed-loop regulation |
| VIN (7) | Main Supply Input | Accepts 2.8V–5.5V DC input; bypassed with 10µF ceramic capacitor near pin |
| VC (8) | Compensation Node | Feedback summing point for lamp current, RPROG programming, and error amplifier; requires 0.1µF capacitor to GND for stability |
| RPROG (9) | Lamp Current Programming | Connects to GND via resistor (6.4kΩ nominal); sets lamp current as ILAMP = 32V/RPROG |
| SHDN (10) | Active-Low Shutdown Control | Pull below 0.4V to disable regulator; draws <1µA when asserted; pull above 1.2V for normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrates 1A NMOS/PMOS switches with 0.18Ω RON, eliminating external diode and improving efficiency to >90% |
| Accurate Lamp Current Regulation | ±2% min accuracy over temperature enables stable brightness and extends CCFL lifetime beyond 20,000 hours |
| Programmable Dimming Frequency | External CDIM capacitor allows precise tuning of dimming PWM (190–310Hz) to avoid mechanical resonance and audible noise |
| Thermal and Overvoltage Protection | Junction shutdown at 125°C and OVSEN-triggered zero-duty-cycle response prevent damage during open-lamp or overload faults |
| Low-Power Shutdown Mode | <2µA quiescent current meets stringent battery standby requirements in PDAs and handheld GPS units |
Applications
| Handheld GPS with Map Display | Portable Instrument Backlighting |
|---|---|
|
Use Scenario: High-resolution color map display requiring uniform, flicker-free backlight under variable ambient light and battery load. IC Role / Device Role / Timing Role: CCFL driver IC providing constant-current AC excitation to lamp via Royer transformer, synchronized to internal 300kHz switch clock. Use Value: Delivers 2–5mA lamp current with ±2% accuracy and 0–100% linear dimming-enabling daylight-readable contrast and >10-hour battery life on single Li-ion cell. |
Use Scenario: Precision multimeter or oscilloscope with segmented LCD needing stable, low-noise backlight during measurement acquisition. IC Role / Device Role / Timing Role: Synchronous current-mode controller regulating lamp current independent of input voltage sag during battery discharge. Use Value: Maintains consistent luminance across 2.8V–5.5V input range and rejects EMI via sinusoidal lamp drive-critical for signal integrity in sensitive analog instruments. |
| PDA Display Backlight | Handheld TV/Video Monitor |
|
Use Scenario: Compact PDA with QVGA LCD requiring minimal board area and ultra-low standby power between touchscreen interactions. IC Role / Device Role / Timing Role: Integrated CCFL regulator with shutdown control (SHDN/VDIM) and internal 1A switches-replacing discrete FET + controller solutions. Use Value: Reduces component count by 40% and cuts shutdown current to <2µA-extending idle battery life to >1 week without compromising brightness control resolution. |
Use Scenario: Portable video monitor used outdoors, demanding wide dimming range, no visible flicker, and immunity to thermal drift during extended playback. IC Role / Device Role / Timing Role: Fixed-frequency current-mode PWM controller with thermal shutdown and OVSEN protection-ensuring safe operation during lamp aging or connector disconnection. Use Value: Enables 150–500Hz external PWM override and maintains ±6% lamp current accuracy from –40°C to +85°C-guaranteeing reliable video playback in diverse environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1184F | SO-16 package; 200kHz switching; 1.25A switch rating; no integrated CDIM oscillator | Requires external dimming circuitry; better suited for higher-power lamps (>1.5W) and fixed-frequency industrial displays | Select LT1184F when higher output current or SOIC layout compatibility is required; LTC1697EMS#TRPBF offers smaller MSOP footprint and simpler dimming setup |
| LT1786 | SSOP-16 package; 8V–24V input; SMBus interface; programmable soft-start and fault reporting | Targeted at automotive and industrial CCFL systems with wide input range and diagnostics-not compatible with single-cell Li-ion supply | Choose LT1786 for high-reliability, wide-input applications with digital control needs; LTC1697EMS#TRPBF is optimized for low-voltage portable use with minimal external components |
Compared with LT1184F and LT1786, the LTC1697EMS#TRPBF provides the smallest solution size (MSOP-10), lowest quiescent current (<2µA), and simplest dimming implementation (single CDIM cap + VDIM voltage), making it uniquely suited for space-constrained, battery-critical handheld devices.
Availability
LTC1697EMS#TRPBF is available at Aetrix Electronics and suitable for handheld GPS, portable instrumentation, PDA backlighting, and portable video monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1697EMS#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 product lines with full datasheet, simulation model, and application note support.
The LTC1697EMS#TRPBF belongs to Linear's legacy CCFL backlight controller family, engineered specifically for high-efficiency, low-noise, single-cell Li-ion powered portable displays-prioritizing lamp lifetime, dimming fidelity, and minimal external component count.
FAQ
What is the minimum input voltage required for stable operation of the LTC1697EMS#TRPBF?
The LTC1697EMS#TRPBF has a guaranteed operating supply voltage range of 2.8V to 5.5V. Its undervoltage lockout (UVLO) threshold is 2.77V, meaning the device will remain disabled until VIN rises above this level. Below 2.8V, regulation performance-including lamp current accuracy and dimming linearity-is not specified, so design margin should maintain VIN ≥2.85V for robust operation across temperature and load.
How does the LTC1697EMS#TRPBF achieve accurate lamp current control without a high-side current sense?
The LTC1697EMS#TRPBF uses lossless current sensing through the internal NMOS switch and integrates slope compensation for stable current-mode control. Lamp current is regulated indirectly but precisely via feedback from the LAMP pin, which connects internally to ground through a 50–60Ω resistor. The feedback circuit injects a current into the VC node proportional to |ILAMP|, enabling closed-loop control with ±2% accuracy over temperature without requiring external high-side sensing components.
Can the LTC1697EMS#TRPBF be used with external PWM dimming signals instead of its internal oscillator?
Yes, the LTC1697EMS#TRPBF supports external PWM dimming: grounding the CDIM pin disables the internal dimming oscillator, allowing an external 150Hz–500Hz PWM signal to be applied directly to the VDIM pin. This mode retains full 0–100% dimming control and preserves the internal lamp current regulation loop-making it ideal for systems requiring synchronized dimming with display frame rates or microcontroller-generated timing.
What is the role of the 0VSEN pin on the LTC1697EMS#TRPBF, and how is it connected?
The 0VSEN pin on the LTC1697EMS#TRPBF provides overvoltage protection for the high-voltage Royer transformer by monitoring emitter voltage of the drive transistors. It is connected through a resistor (value determined by transformer specs) to those emitters. When current drawn from 0VSEN reaches 16.65–26.35µA, the LTC1697EMS#TRPBF forces the SW pin to 0% duty cycle-preventing transformer saturation and potential failure during lamp removal or open-circuit conditions.
Is the LTC1697EMS#TRPBF pin-compatible with other Linear CCFL controllers like the LT1184F?
No, the LTC1697EMS#TRPBF is not pin-compatible with LT1184F or other Linear CCFL controllers. It uses a proprietary 10-pin MSOP layout optimized for minimal external components, whereas LT1184F uses a 16-pin SOIC package with different pin assignments (e.g., separate gate drivers, no integrated CDIM oscillator). PCB redesign and schematic revision are required when substituting between these families.
LTC1697EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, Cold Cathode Fluorescent Lamp (CCFL)
- Voltage - Input:
- 2.8V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1697EMS#TRPBF FAQ
1.How can I place an order for LTC1697EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1697EMS#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 LTC1697EMS#TRPBF reliable?
The price and inventory of LTC1697EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1697EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1697EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1697EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1697EMS#TRPBF?
LTC1697EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1697EMS#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 LTC1697EMS#TRPBF?
For technical support, including LTC1697EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1697EMS#TRPBF requirements.
6.How does Aetrix verify that LTC1697EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1697EMS#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 LTC1697EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1697EMS#TRPBF?
All LTC1697EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1697EMS#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 LTC1697EMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1697EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1697EMS#TRPBF Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
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…
