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Analog Devices Inc. LTC1734LES6-4.2#TRM
- Part No.:
- LTC1734LES6-4.2#TRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1734LES6-4.2#TRM.pdf
- Description:
- IC BATT CHG MULTI-CHEM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:142
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Product details
Overview
LTC1734LES6-4.2#TRM from Analog Devices (formerly Linear Technology) is a single-cell Li-ion linear battery charger controller in SOT-23 package, delivering 4.2V ±1% float voltage, programmable 50–180mA constant-current output via external resistor, and PROG-pin-based current monitoring for microcontroller-driven charge termination. It operates in handheld digital cameras, charging docks, and low-cost portable electronics requiring compact, thermally protected charging.
For engineers reviewing the LTC1734LES6-4.2#TRM datasheet, LTC1734LES6-4.2#TRM pinout, LTC1734LES6-4.2#TRM application, or LTC1734LES6-4.2#TRM equivalent, key selection criteria include its 4.2V fixed float accuracy, manual shutdown via PROG pin floating, sleep mode under VCC removal, negligible battery drain (<1µA), and compatibility with external PNP pass transistors for thermal and current limiting.
Technical Context
The LTC1734LES6-4.2#TRM implements dual-loop control: a precision 2.5V reference and resistor divider sets 4.2V float voltage at BAT pin, while amplifier A2 regulates charge current by forcing 1.5V across RPROG to achieve IBAT = 250 × (1.5V / RPROG). Its internal 0.24Ω sense resistor and 60Ω scaled resistor establish the 250:1 current ratio between ISENSE and PROG pin current.
It integrates undervoltage lockout (4.45–4.68V exit threshold), thermal/overcurrent protection on DRIVE pin, and automatic sleep mode when VCC = 0V. Shutdown is triggered by floating PROG (via 3µA pull-up) above 2.15V, disabling both voltage and current loops while maintaining <1µA battery leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.20V ±1% - ensures safe full-charge termination for standard Li-ion cells without overvoltage risk. |
| Charge Current Range | 50mA to 180mA - set by single external RPROG (7.5kΩ to 2.1kΩ), enabling scalable power delivery. |
| PROG Pin Monitor Ratio | IBAT = 250 × (VPROG / RPROG) - allows direct ADC reading of real-time charge current for firmware-controlled termination. |
| UVLO Threshold | 4.45V to 4.68V - prevents erratic startup during marginal input supply; 150mV hysteresis avoids oscillation. |
| Battery Drain in Sleep | <1µA - permits indefinite battery connection during storage without significant self-discharge. |
| Operating Temp Range | –40°C to +85°C - validated for industrial and consumer portable environments with full parameter guarantee. |
| Junction Temp Limit | 125°C - triggers thermal shutdown before die damage; θJA = 230°C/W supports SOT-23 thermal design. |
Pinout & Package
Package: 6-lead plastic SOT-23 (ThinSOT™), 1mm profile, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISENSE (1) | Sense node for emitter current of external PNP | Carries full PNP emitter current (IBAT + IBASE); connects to PNP emitter and internal 0.24Ω sense resistor. |
| GND (2) | Ground reference | Return path for all internal circuits and voltage regulation; must be low-impedance to avoid float voltage error. |
| VCC (3) | Positive input supply | Supplies control circuitry and PNP base drive; requires 1–10µF bypass capacitor to GND. |
| PROG (4) | Current programming & monitor | 1.5V virtual reference for RPROG; voltage proportional to IBAT (VPROG = IBAT × RPROG / 250); floating initiates shutdown. |
| BAT (5) | Battery voltage sense input | Connects to Li-ion anode; internal 2.5V reference divider sets 4.2V float; requires ≥5µF bypass for stability. |
| DRIVE (6) | PNP base drive output | Sink driver for PNP base; current-limited and thermally protected; no external blocking diode needed. |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor required | Integrated 0.24Ω current sense enables precise IBAT regulation without added BOM cost or layout area. |
| Fixed 4.2V float with 1% accuracy | Guaranteed over –40°C to +85°C ambient eliminates need for external voltage trimming or calibration. |
| PROG pin current monitoring | Enables real-time charge current readback using MCU ADC-no additional op-amp or shunt needed. |
| Automatic sleep mode on VCC removal | Reduces battery drain to <1µA without external circuitry, extending shelf life of battery-backed devices. |
| Manual shutdown via PROG pin | Floating PROG pin (or pulling >2.25V) disables charging instantly while preserving battery state-of-charge. |
Applications
| Digital Cameras | Charging Docks |
|---|---|
Use Scenario: Compact rechargeable digital camera with integrated Li-ion battery and USB-powered charging. IC Role / Device Role / Timing Role: Linear charger controller managing CC/CV charge profile, float voltage regulation, and PROG-based termination signaling. Use Value: Enables small form factor (SOT-23 footprint), eliminates need for discrete current-sense resistor or voltage reference IC, and supports firmware-controlled end-of-charge detection. | Use Scenario: Multi-device cradle that charges smartphones, Bluetooth headsets, and wearables simultaneously. IC Role / Device Role / Timing Role: Dedicated per-port Li-ion charger providing stable 4.2V float and programmable current scaling for varying battery capacities. Use Value: Allows flexible current configuration (50–180mA) per port using different RPROG values, reduces thermal stress via built-in current/thermal limiting, and minimizes standby drain during idle periods. |
| Handheld Computers | Low-Cost Portable Radios |
Use Scenario: Ruggedized industrial PDA with hot-swappable Li-ion battery and field-replaceable charger module. IC Role / Device Role / Timing Role: Primary battery management controller handling charge initiation, CV transition, and safe termination under variable load conditions. Use Value: Supports wide input range (4.55–8V), tolerates battery disconnection during charge, and maintains <1µA drain in sleep-critical for long-term deployment without maintenance. | Use Scenario: Battery-powered two-way radio used in logistics and security applications with frequent intermittent charging. IC Role / Device Role / Timing Role: Standalone linear charger IC ensuring reliable top-off without overvoltage, with manual shutdown for battery preservation during storage. Use Value: Delivers guaranteed 4.2V ±1% float for cell longevity, enables zero-power shutdown via PROG pin floating, and avoids external diode losses-improving efficiency in low-power operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion linear charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73831T-2DCI/OT | Fixed 4.2V float, 500mA max, integrated MOSFET, no external PNP required; SOT-23-5 package, lacks PROG current monitor output. | Higher current capability but no analog current feedback; suited for simpler, higher-power applications without MCU integration. | Select when board space is constrained and external transistor drive is undesirable; avoid if PROG-based charge termination is required. |
| BQ24040DRCR | 4.2V float, 800mA max, integrated N-channel MOSFET, thermal foldback, no PROG monitor; 10-pin WSON package. | Higher integration and current rating, but no analog current sensing interface; includes pre-charge and trickle-charge modes. | Choose for high-volume, cost-sensitive designs needing plug-and-play charging; not suitable where firmware-controlled current monitoring is mandatory. |
Compared with MCP73831T-2DCI/OT and BQ24040DRCR, the LTC1734LES6-4.2#TRM offers unique PROG-pin current monitoring for closed-loop MCU control, external PNP flexibility for thermal/power optimization, and ultra-low sleep-mode drain-making it optimal for resource-constrained, intelligent portable systems.
Availability
LTC1734LES6-4.2#TRM is available at Aetrix Electronics and suitable for digital cameras, charging docks, and handheld computers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for LTC1734LES6-4.2#TRM 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 continues its legacy of high-performance analog ICs for precision power, signal conditioning, and battery management.
The LTC1734L product line was designed specifically for cost-sensitive, space-constrained portable Li-ion charging applications where external PNP transistor selection enables thermal and power trade-offs unattainable with fully integrated solutions.
FAQ
What is the exact float voltage specification for LTC1734LES6-4.2#TRM?
The LTC1734LES6-4.2#TRM provides a fixed 4.2V float voltage with ±1% accuracy (4.158V to 4.242V) over the full –40°C to +85°C operating ambient temperature range. This value is factory-trimmed and does not require external adjustment. The "4.2" in the part number explicitly denotes this preset voltage, distinguishing it from other variants like LTC1734LES6-4.1.
How is charge current programmed on LTC1734LES6-4.2#TRM?
Charge current is programmed using a single external resistor (RPROG) between the PROG pin and ground. The relationship is IBAT = 250 × (1.5V / RPROG), yielding 50mA with 7.5kΩ and 180mA with 2.1kΩ. RPROG must be placed close to the PROG pin to limit capacitive loading, and values below 1.8kΩ are not recommended due to maximum PROG pin current limits.
Does LTC1734LES6-4.2#TRM require an external blocking diode?
No, the LTC1734LES6-4.2#TRM does not require an external blocking diode. Its DRIVE pin architecture and internal current limiting eliminate reverse current flow from battery to input when VCC is removed. This simplifies design, reduces component count, and improves efficiency compared to diode-based solutions.
What happens to battery drain current when LTC1734LES6-4.2#TRM enters sleep mode?
When VCC is removed, the LTC1734LES6-4.2#TRM automatically enters sleep mode with battery drain current limited to –1µA to +1µA (typical ~0µA). This near-zero leakage preserves battery charge during storage or standby, a critical feature for portable devices left unused for extended periods.
Can LTC1734LES6-4.2#TRM be used for NiMH/NiCd charging?
Yes, the LTC1734LES6-4.2#TRM can function as a constant-current source for NiMH/NiCd batteries by grounding the BAT pin to disable the voltage regulation loop. In this mode, only the PROG-resistor-set current flows, supporting 10–180mA output depending on external PNP selection and thermal limits-though external voltage cutoff or delta-V termination remains necessary.
LTC1734LES6-4.2#TRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 8V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1734LES6-4.2#TRM FAQ
1.How can I place an order for LTC1734LES6-4.2#TRM through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1734LES6-4.2#TRM 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 LTC1734LES6-4.2#TRM reliable?
The price and inventory of LTC1734LES6-4.2#TRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1734LES6-4.2#TRM is usually 5 days.
3.What payment methods are accepted for LTC1734LES6-4.2#TRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1734LES6-4.2#TRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1734LES6-4.2#TRM?
LTC1734LES6-4.2#TRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1734LES6-4.2#TRM 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 LTC1734LES6-4.2#TRM?
For technical support, including LTC1734LES6-4.2#TRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1734LES6-4.2#TRM requirements.
6.How does Aetrix verify that LTC1734LES6-4.2#TRM is sourced from the original manufacturer or authorized distributors?
All LTC1734LES6-4.2#TRM 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 LTC1734LES6-4.2#TRM meets industry standards.
7.What is the process for return or replacement of LTC1734LES6-4.2#TRM?
All LTC1734LES6-4.2#TRM units undergo pre-shipment inspection (PSI). If there is an issue with LTC1734LES6-4.2#TRM, 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 LTC1734LES6-4.2#TRM part is unused and in its original packaging.
Return procedure for LTC1734LES6-4.2#TRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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