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Analog Devices Inc. LTC3202EMS#PBF
- Part No.:
- LTC3202EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3202EMS#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:181
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Product details
Overview
LTC3202EMS#PBF from Analog Devices (formerly Linear Technology) is a low-noise, constant-frequency fractional charge pump DC/DC converter designed as a programmable white LED current source for backlighting. It delivers up to 125mA output current from a 2.7V–4.5V input, operates at 1.5MHz, features 2-bit DAC-controlled feedback set points (0.2V/0.4V/0.6V), and requires no inductors.
For engineers reviewing the LTC3202EMS#PBF datasheet, LTC3202EMS#PBF pinout, LTC3202EMS#PBF application, or LTC3202EMS#PBF equivalent, this page provides verified pin functions, real-world LED brightness control configurations, thermal shutdown behavior, soft-start timing, and validated alternative drivers for portable display power design.
Technical Context
The LTC3202EMS#PBF implements a 2-phase nonoverlapping 1.5MHz oscillator to drive a fractional (2:3) switched-capacitor charge pump, generating up to 1.5×VIN at VOUT. Regulation is achieved via error amplification of FB voltage against one of three DAC-set reference voltages (0.2V/0.4V/0.6V), modulating pump strength to maintain constant current or voltage.
It integrates automatic soft-start (≈500µs ramp), CMOS-compatible D0/D1 digital control inputs with defined logic thresholds (VIH = 1.3V, VIL = 0.4V), thermal shutdown (~160°C trip), and short-circuit current limiting (~250mA). The exposed-pad MSOP-10 package enables low θJA = 120°C/W thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 4.5V - supports single-cell Li-ion or Li-poly battery operation without pre-regulation. |
| Switching Frequency | 1.5MHz (typ) - enables use of small 1µF ceramic flying and output capacitors; reduces EMI filtering burden. |
| Max Output Current | 125mA - sufficient to drive 6 parallel white LEDs at 20mA each in backlight applications. |
| Feedback Set Points | 0.2V / 0.4V / 0.6V - selectable via D0/D1 pins; sets LED current ILED = VFB / RX with typical sense resistor values (e.g., 36Ω → 5.6mA/11.1mA/16.7mA per LED). |
| Shutdown Current | <1µA - disconnects VOUT from VIN and minimizes battery drain during display off-state. |
| Open-Loop Output Impedance | 4.5Ω to 6Ω - determines load regulation slope (∆VOUT/∆IOUT ≈ 0.35mV/mA) and maximum available current under given VIN–VOUT margin. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and portable consumer temperature environments. |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm, 0.5mm pitch), exposed pad connected to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1 (Pin 1) | Digital Control Input | MSB of 2-bit DAC; logic high selects 0.4V or 0.6V FB set point; must be driven - not floated. |
| FB (Pin 2) | Regulation Feedback Input | Sense node for closed-loop control; connects to voltage divider or sense resistor; input bias current <±50nA. |
| VOUT (Pin 3) | Charge Pump Output | Delivers regulated voltage/current to LED string; requires ≥1µF X5R/X7R ceramic bypass to GND. |
| VIN (Pin 4) | Main Power Input | 2.7V–4.5V supply input; must be bypassed with 1µF–4.7µF low-ESR ceramic capacitor. |
| GND (Pin 5) | Analog & Power Ground | Reference for control circuitry and charge pump; connect directly to low-impedance ground plane. |
| C2– (Pin 6) | Flying Capacitor Terminal | One terminal of second flying capacitor (C2); polarity-sensitive - reverse voltage can damage device. |
| C2+ (Pin 7) | Flying Capacitor Terminal | Second terminal of C2; forms charge-transfer path during pump phase switching. |
| C1+ (Pin 8) | Flying Capacitor Terminal | First terminal of primary flying capacitor (C1); high dv/dt node - minimize trace length. |
| C1– (Pin 9) | Flying Capacitor Terminal | Second terminal of C1; paired with C1+ to form series/parallel reconfiguration path. |
| D0 (Pin 10) | Digital Control Input | LSB of 2-bit DAC; logic high selects 0.2V or 0.6V FB set point; CMOS-compatible, VIH ≥1.3V. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI; reduces board area and BOM count by two fewer inductors vs. boost topology. |
| Programmable LED current | Three discrete current levels via D0/D1 pins - enables hardware-selectable brightness tiers without external DAC or MCU GPIO. |
| Low-noise constant-frequency operation | 1.5MHz fixed frequency avoids audible noise and simplifies EMI filter design vs. variable-frequency charge pumps. |
| Automatic soft-start | Linear 500µs output current ramp prevents inrush into LED capacitance and stabilizes regulation during mode transitions. |
| Thermal & short-circuit protection | Self-limiting to ~250mA under short and cycles safely at ~160°C junction - protects IC and system during fault conditions. |
Applications
| Smartphone LCD Backlight | Tablet Display Power |
|---|---|
Use Scenario: Driving 4–6 parallel white LEDs in a compact handheld display with single-cell Li-ion battery (3.0V–4.2V). IC Role / Device Role / Timing Role: Constant-current charge pump regulator controlling LED brightness via D0/D1 hardware select or PWM dimming on control pins. Use Value: Delivers stable 125mA total output with <0.35mV/mA load regulation, enabling uniform LED luminance across battery discharge cycle. | Use Scenario: Powering high-resolution IPS panel backlight requiring low ripple and minimal EMI in space-constrained PCB layout. IC Role / Device Role / Timing Role: Low-noise 1.5MHz charge pump providing regulated current without inductor-induced field coupling or acoustic noise. Use Value: Achieves <20mVpp output ripple with 1µF ceramic output cap, meeting display image quality requirements while reducing layout sensitivity. |
| Portable Medical Monitor | Industrial HMI Display |
Use Scenario: Illuminating diagnostic-grade LCD in battery-powered medical device requiring long runtime and guaranteed fault safety. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with thermal shutdown, indefinite VOUT-to-GND short survival, and sub-1µA shutdown current. Use Value: Maintains safe operation over –40°C to +85°C ambient; eliminates risk of thermal runaway during extended use or environmental stress. | Use Scenario: Backlighting ruggedized human-machine interface with wide-temp industrial qualification and high reliability demand. IC Role / Device Role / Timing Role: Programmable current source supporting both hardware-set brightness levels and PWM dimming for operator-adjustable UI intensity. Use Value: Enables dual-mode brightness control (D0/D1 static selection + 100–500Hz PWM) without redesign - improves field serviceability and user experience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED current source applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3201EMS#PBF | 1.7MHz switching frequency; 6.5mA operating current (vs. 2.5–5mA for LTC3202); same 10-pin MSOP package and pinout. | Optimized for lower quiescent current in always-on display segments; slightly higher efficiency at light loads. | Select when prioritizing ultra-low IQ over absolute minimum input current - especially in standby-biased systems. |
| LTC3200EMS#PBF | 2MHz switching frequency; 8mA operating current; identical FB/D0/D1 functionality and 125mA output capability. | Better high-frequency ripple suppression due to faster clock; higher IQ makes it less suitable for battery-critical applications. | Choose when board-level EMI filtering is constrained and higher switching frequency improves noise spectrum management. |
Compared with LTC3202EMS#PBF, LTC3201EMS#PBF offers lower operating current but reduced peak output strength, while LTC3200EMS#PBF trades higher IQ for superior high-frequency ripple rejection - all share identical control interface and package compatibility for drop-in evaluation.
Availability
LTC3202EMS#PBF is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display power, portable medical monitors, industrial HMI displays, and battery-powered consumer electronics requiring stable component supply and long-lifecycle support.
Supply support for LTC3202EMS#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3202 series.
The LTC3202 belongs to Linear's precision charge pump LED driver family, engineered specifically for low-noise, inductorless white LED backlighting in portable battery-powered devices where size, EMI, and efficiency are critical.
FAQ
What is the exact function of the D0 and D1 pins on the LTC3202EMS#PBF?
The D0 and D1 pins on the LTC3202EMS#PBF are digital control inputs that configure the internal 2-bit DAC to select one of four FB voltage set points: 0V (shutdown), 0.2V, 0.4V, or 0.6V. These voltages determine LED current via ILED = VFB / RX. Both pins must be actively driven - floating states are undefined and may cause erratic regulation or unintended shutdown. The LTC3202EMS#PBF datasheet specifies VIH ≥1.3V and VIL ≤0.4V for reliable logic interpretation.
Can the LTC3202EMS#PBF drive more than 125mA continuously?
No - the LTC3202EMS#PBF is rated for a maximum continuous output current of 125mA under specified thermal conditions (TA ≤85°C, proper PCB copper pour). Its short-circuit current limit is ~250mA, but sustained operation above 125mA risks thermal shutdown activation or accelerated degradation. For higher current needs, consider the LTC3251 or LTC3252 step-down charge pumps. The LTC3202EMS#PBF's open-loop output impedance (4.5–6Ω) also constrains usable current based on VIN–VOUT margin.
Does the LTC3202EMS#PBF require external compensation components?
No - the LTC3202EMS#PBF uses an internally compensated control loop. Stability is ensured by using ≥0.6µF X5R/X7R ceramic output capacitance with low ESR (<0.35Ω). Adding external compensation components will destabilize the regulator. The LTC3202EMS#PBF's closed-loop output resistance is fixed at ~0.35Ω, and its dominant pole is formed by the output capacitor itself - per the datasheet layout guidelines.
How does soft-start work on the LTC3202EMS#PBF, and when is it triggered?
The LTC3202EMS#PBF implements automatic linear soft-start over ≈500µs, ramping output current from zero to full scale to prevent inrush into LED capacitance. It triggers on power-up and whenever D0 or D1 pin state changes - ensuring smooth transitions between brightness levels. During soft-start, the FB set point drops to zero momentarily. The LTC3202EMS#PBF's soft-start circuit is fully integrated; no external components are required or supported.
Is the LTC3202EMS#PBF pin-compatible with other parts in the LTC320x family?
Yes - the LTC3202EMS#PBF shares identical pinout, package dimensions, and FB/D0/D1 control interface with LTC3200EMS#PBF and LTC3201EMS#PBF in the MSOP-10 variant. This allows direct substitution for evaluation or design flexibility. However, differences in switching frequency (1.5MHz vs. 1.7MHz vs. 2MHz), operating current, and thermal characteristics mean performance validation is required per application. The LTC3202EMS#PBF remains electrically and mechanically interchangeable in existing layouts.
LTC3202EMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 125mA
- Frequency:
- 1.5MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3202EMS#PBF FAQ
1.How can I place an order for LTC3202EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3202EMS#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 LTC3202EMS#PBF reliable?
The price and inventory of LTC3202EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3202EMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3202EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3202EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3202EMS#PBF?
LTC3202EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3202EMS#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 LTC3202EMS#PBF?
For technical support, including LTC3202EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3202EMS#PBF requirements.
6.How does Aetrix verify that LTC3202EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3202EMS#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 LTC3202EMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3202EMS#PBF?
All LTC3202EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3202EMS#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 LTC3202EMS#PBF part is unused and in its original packaging.
Return procedure for LTC3202EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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