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Analog Devices Inc. LTC3207EUF#PBF
- Part No.:
- LTC3207EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3207EUF#PBF.pdf
- Description:
- IC LED DRV RGLTR ANALOG 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,004
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Product details
Overview
LTC3207EUF#PBF from Analog Devices (formerly Linear Technology) is a highly integrated multi-output LED/CAM driver IC featuring a low-noise, multi-mode charge pump (1x/1.5x/2x), twelve 27.5mA universal current sources with 64-step linear brightness control, and one 425mA camera LED current source with 16-step control and 2-second high-current safety timer. It operates from 2.9V to 5.5V VBAT and supports I²C-controlled independent on/off, blinking, gradation, and dimming for mobile display backlighting and flash applications.
For engineers reviewing the LTC3207EUF#PBF datasheet, LTC3207EUF#PBF pinout, LTC3207EUF#PBF application, or LTC3207EUF#PBF equivalent, key selection considerations include its 24-pin 4mm × 4mm QFN package, dual I²C address support (00110110), automatic mode switching based on LED dropout detection, slew-limited switching for EMI reduction, and configurable ENU pin for asynchronous LED enable/disable control.
Technical Context
The LTC3207EUF#PBF implements a 850kHz fixed-frequency, non-overlapping 2-phase switched-capacitor charge pump with three operating modes: direct pass-through (1x), 1.5× boost, and 2× boost - automatically selected based on real-time dropout detection at any enabled ULED or CAM output. Each of the twelve universal current sources integrates a 6-bit linear DAC and independent blink/gradation registers, while the CAM channel includes dual 4-bit registers (high/low) selectable via the CAMHL pin.
Charge pump strength is modeled as a Thevenin-equivalent source with open-loop output resistance varying by mode (0.6Ω in 1x, ~3.6Ω in 1.5x, ~4.1Ω in 2x), enabling precise current delivery under dynamic load conditions. Internal soft-start limits inrush current during mode transitions, and all digital I/O (SCL/SDA/ENU/CAMHL) reference DVCC (1.5V–5.5V), with absolute max ratings up to 6V on analog pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBAT Operating Voltage | 2.9V to 5.5V - supports single-cell Li-ion and Li-poly battery input without external regulation |
| Total Output Current | Up to 600mA pulsed (10% duty cycle) - enables simultaneous drive of main/sub/RGB displays plus camera flash |
| Universal LED Current | 24.2–31mA full-scale per ULED1–ULED12 (6-bit DAC, 64 steps) - ensures consistent brightness across 12-channel display backlights |
| CAM LED Current | 0–425mA full-scale (4-bit DAC, 16 steps) with 2-second safety timer - provides controlled high-intensity flash without thermal runaway |
| Charge Pump Modes | 1x / 1.5x / 2x auto-switching - minimizes noise and maximizes efficiency by using lowest possible gain until dropout occurs |
| I²C Interface | Standard 2-wire, up to 400kHz - compatible with microcontroller peripherals and supports two addresses (00110110 for LTC3207) |
| Package | 24-pin 4mm × 4mm QFN with exposed pad - thermally optimized for handheld device PCBs with limited area |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 25 = GND, must be soldered to PCB ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPO (Pin 1) | Charge pump output | Supplies regulated voltage (up to 5.05V) to all LED current sources; requires 4.7µF ceramic capacitor to GND |
| ULED1–ULED12 (Pins 2–6, 12–18) | Universal LED current outputs | Each delivers 0–27.5mA with 6-bit linear DAC control; also configurable as I²C-controlled open-drain GPOs |
| CAM (Pin 7) | Camera LED current output | Delivers 0–425mA with 4-bit DAC and dual-register high/low selection via CAMHL; includes 2s safety timer |
| CAMHL (Pin 8) | Camera register select | High = CAM high-current register; low = CAM low-current register; falling edge resets charge pump to 1x mode |
| DVCC (Pin 9) | Digital supply reference | Sets logic threshold for SCL/SDA/ENU/CAMHL (1.5–5.5V); UVLO at 1V resets registers on power-up |
| SCL/SDA (Pins 10/11) | I²C interface | Standard 2-wire serial bus (400kHz max); slave-only operation with ACK handshake and sub-addressed register access |
| C1P/C1M/C2P/C2M (Pins 19–20, 23–24) | Flying capacitor connections | Support 2.2µF ceramic capacitors for charge pump operation; slew-limited switching reduces EMI |
| VBAT (Pin 21) | Main power input | Supplies entire IC (2.9–5.5V); requires 2.2µF low-ESR ceramic bypass capacitor |
| ENU (Pin 22) | Asynchronous enable | Toggles preselected ULED outputs without I²C traffic; falling edge resets charge pump to 1x if other outputs active |
| GND (Pin 25, Exposed Pad) | Ground reference & thermal path | Must be soldered to PCB ground plane for electrical integrity and thermal dissipation (θJA = 40°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Multi-mode charge pump (1x/1.5x/2x) | Automatically optimizes efficiency and noise: 1x mode used when possible; switches only upon confirmed LED dropout (>400µs hold time) |
| Slew-limited flying capacitor switching | 5–10ns edge rates on C1P/C1M/C2P/C2M reduce conducted/radiated EMI - critical for RF-sensitive mobile designs |
| Independent ULED gradation control | Three ramp times (0.24s/0.48s/0.96s) per ULED channel via REG15 - enables smooth UI transitions without MCU intervention |
| Configurable ENU pin behavior | Enables hardware-triggered LED activation (e.g., incoming call alert) with optional preprogrammed gradation ramp-up/down |
| Dual I²C addresses | LTC3207 = 00110110, LTC3207-1 = 00110100 - allows co-location of both variants on same bus for flexible system partitioning |
| Internal soft-start & protection | Linear 125µs current ramp during 1.5x/2x transitions prevents supply droop; includes short-circuit and thermal shutdown |
Applications
| Mobile Phone Display Backlighting | Smartphone Camera Flash Control |
|---|---|
Use Scenario: Driving 4-main + 2-sub + dual RGB LEDs in QVGA+ resolution handsets with dynamic brightness scaling. IC Role / Device Role / Timing Role: Universal LED driver providing independent 6-bit dimming, blinking, and gradation for each display segment via I²C. Use Value: Eliminates need for multiple discrete drivers; 91% peak efficiency extends battery life while slew-limited switching avoids RF interference with cellular bands. |
Use Scenario: Delivering high-current white LED flash for smartphone cameras with thermal safety and fast mode switching. IC Role / Device Role / Timing Role: Dedicated CAM current source with 4-bit DAC, dual-register high/low control, and hardware-synchronized 2-second safety timer. Use Value: Enables burst-mode flash photography without firmware overhead; CAMHL pin allows instant high-current activation without I²C latency. |
| Portable Media Player UI Lighting | Video Phone Status Indicators |
Use Scenario: Controlling multicolor status LEDs and segmented backlighting in portable audio/video players. IC Role / Device Role / Timing Role: Twelve ULED channels configured as general-purpose open-drain outputs (GPO mode) with I²C addressability. Use Value: Replaces discrete LED drivers and GPIO expanders; GPO mode disables dropout detection, preventing unintended charge pump mode changes. |
Use Scenario: Managing call-waiting, network, and mute indicators in VoIP-enabled video phones with visual feedback timing. IC Role / Device Role / Timing Role: Independent blink control (1.25s/2.5s period) and gradation timing (0.24–0.96s ramp) per ULED channel. Use Value: Offloads timing-critical UI animations from host MCU; ENU pin enables hardware-triggered indicator activation during low-power states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3728-QFLS4-TR | 18-channel 40mA constant-current LED driver with PWM dimming; no integrated charge pump - requires external 5V rail | Designed for fixed-voltage systems (e.g., USB-powered accessories); lacks auto-boost and safety timer | Choose when board already has stable 5V supply and needs higher channel count; not suitable for single-cell battery operation |
| TPS61165DRVR | Single-output 40V boost LED driver with analog/PWM dimming; no I²C interface or multi-channel capability | Targeted at high-VF LED strings (e.g., automotive interior lighting); no ULED/CAM segmentation or gradation features | Choose for high-voltage, single-string applications where I²C control and multi-zone dimming are unnecessary |
Compared with IS31FL3728-QFLS4-TR and TPS61165DRVR, the LTC3207EUF#PBF uniquely integrates charge pump regulation, dual-domain (ULED/CAM) current control, hardware safety timers, and asynchronous enable - making it optimal for space-constrained, battery-powered mobile displays requiring coordinated multi-light control.
Availability
LTC3207EUF#PBF is available at Aetrix Electronics and suitable for mobile phone display backlighting, smartphone camera flash modules, portable media player UI lighting, and video phone status indicator systems requiring stable component supply across industrial temperature ranges.
Supply support for LTC3207EUF#PBF 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 digital signal processing semiconductors for precision instrumentation, communications, and power management.
The LTC3207EUF#PBF belongs to Linear's legacy LED driver product line, specifically engineered for compact, low-EMI, multi-display mobile devices requiring integrated charge pump regulation and fine-grained I²C-controlled current sourcing.
FAQ
What is the I²C address of the LTC3207EUF#PBF?
The LTC3207EUF#PBF uses the fixed 7-bit I²C slave address 00110110 (0x36 in hexadecimal). This distinguishes it from the pin-compatible LTC3207-1 variant, which uses 00110100 (0x34). Both addresses are hardwired and cannot be changed via software or external pins. The LTC3207EUF#PBF requires standard I²C start/stop conditions and acknowledges after the address byte before accepting sub-address and data bytes.
How does the LTC3207EUF#PBF handle LED dropout detection and mode switching?
The LTC3207EUF#PBF monitors voltage headroom at each enabled ULED or CAM output. When any current source enters dropout (i.e., insufficient voltage to maintain programmed current), the device waits ~400µs to confirm thermal stabilization, then switches from 1x → 1.5x mode. A second dropout triggers transition to 2x mode. Mode reverts to 1x upon I²C register write, ENU/CAMHL falling edge, or gradation completion - ensuring minimal noise and highest efficiency whenever possible.
Can the ULED outputs of the LTC3207EUF#PBF be used as general-purpose open-drain outputs?
Yes - the LTC3207EUF#PBF allows ULED1 through ULED12 to operate in General Purpose Output (GPO) mode by setting Bits 6 and 7 of their respective registers (REG1–REG12) to logic 1. In GPO mode, each pin functions as an I²C-controlled open-drain driver with programmable pull-down strength, and dropout detection is disabled to prevent unintended charge pump mode changes. Unused ULED pins must be tied to ground.
What is the purpose and behavior of the CAMHL pin on the LTC3207EUF#PBF?
The CAMHL pin on the LTC3207EUF#PBF selects between two 4-bit CAM current registers: high mode (CAMHL = HIGH) for flash-level current (up to 425mA) and low mode (CAMHL = LOW) for preview/indicator-level current. A falling edge on CAMHL forces immediate reset of the charge pump to 1x mode. The 2-second safety timer disables CAM output automatically in high-current mode unless reset via CAMHL low transition or writing REG13 = 0x00.
Does the LTC3207EUF#PBF require external components beyond capacitors?
No - the LTC3207EUF#PBF requires only five external ceramic capacitors: one 4.7µF (C4) on CPO, two 2.2µF (C1, C2) on flying capacitor pairs C1P/C1M and C2P/C2M, one 2.2µF (C3) on VBAT, and one 0.1µF (C5) on DVCC. No inductors, resistors, or additional ICs are needed. All current setting, dimming, blinking, and gradation are handled internally via I²C registers and precision DACs.
LTC3207EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 13
- Voltage - Supply (Min):
- 2.9V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA, 425mA
- Frequency:
- 850kHz
- Dimming:
- Analog
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3207EUF#PBF FAQ
1.How can I place an order for LTC3207EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3207EUF#PBF 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 LTC3207EUF#PBF reliable?
The price and inventory of LTC3207EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3207EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3207EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3207EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3207EUF#PBF?
LTC3207EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3207EUF#PBF 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 LTC3207EUF#PBF?
For technical support, including LTC3207EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3207EUF#PBF requirements.
6.How does Aetrix verify that LTC3207EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3207EUF#PBF 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 LTC3207EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3207EUF#PBF?
All LTC3207EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3207EUF#PBF, 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 LTC3207EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3207EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3207EUF#PBF Tags
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BCR420UE6433HTMA1
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