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Analog Devices Inc. LTC1734LES6-4.2#TRMPBF
- Part No.:
- LTC1734LES6-4.2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1734LES6-4.2#TRMPBF.pdf
- Description:
- IC BAT CHG MULTCHEM 1CL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC1734LES6-4.2#TRMPBF 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 via external resistor, and PROG-pin-based charge current monitoring. It operates in handheld digital cameras, charging docks, and low-cost portable chargers with automatic sleep mode on input removal.
For engineers reviewing the LTC1734LES6-4.2#TRMPBF datasheet, LTC1734LES6-4.2#TRMPBF pinout, LTC1734LES6-4.2#TRMPBF application, or LTC1734LES6-4.2#TRMPBF equivalent, key selection criteria include its 4.2V precision float voltage, 50–180mA programmable CC range, PROG-pin current-sense interface, manual shutdown capability, and thermal/overcurrent protection without external blocking diode.
Technical Context
The LTC1734LES6-4.2#TRMPBF implements dual-loop linear regulation: a constant-current loop controlled by PROG-pin feedback (250:1 current scaling), and a constant-voltage loop using internal 2.5V reference and precision BAT-pin voltage divider for 4.2V float regulation. It requires an external PNP pass transistor and senses emitter current via ISENSE to derive base drive at DRIVE.
Undervoltage lockout (4.45–4.68V exit threshold) prevents operation below safe input levels; manual shutdown is triggered by floating PROG above 2.15V, while sleep mode activates when VCC = 0V-both limiting battery drain to ≤1µA. Protection includes thermal foldback, DRIVE short-circuit current limiting (35–130mA), and no external sense resistor or blocking diode required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.2V ±1% - ensures precise 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); enables scalable power delivery for compact portable devices. |
| PROG Pin Scaling | 250:1 - 1.5V across RPROG yields full-scale current; allows accurate ADC-based current monitoring and software-controlled termination. |
| UVLO Threshold | 4.45–4.68V - prevents erratic startup or partial charging under marginal 5V supply conditions. |
| Battery Drain in Shutdown | ≤1µA - preserves battery standby time during long-term storage or host MCU sleep cycles. |
| Operating Temp Range | –40°C to +85°C - supports industrial and consumer portable equipment deployment without derating. |
| Junction Temp Limit | 125°C - enables thermal protection before silicon damage occurs under high-power dissipation conditions. |
Pinout & Package
Package: 6-lead SOT-23 (ThinSOT™), 1mm profile, surface-mount compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISENSE (1) | Emitter current sense node | Carries total PNP emitter current (IBAT + IBASE); feeds internal 0.24Ω sense resistor to generate PROG current. |
| GND (2) | Analog and power ground reference | Reference for all internal regulators and comparators; must be connected near battery ground to avoid float voltage error. |
| VCC (3) | Positive input supply | Provides power to control circuitry and drives PNP emitter through internal sense resistor; bypass with 1µF capacitor. |
| PROG (4) | Current programming & monitor | 1.5V virtual reference for RPROG; voltage proportional to IBAT (VPROG = IBAT × RPROG/250); floats to enter shutdown. |
| BAT (5) | Battery voltage sense input | Connects to Li-ion anode; internal 2.5V reference divider sets 4.2V float point; requires ≥5µF bypass for stability. |
| DRIVE (6) | PNP base drive output | Sinks controlled current to PNP base; includes short-circuit and thermal protection; no external driver needed. |
Key Features
| Feature | Design Value |
|---|---|
| No external blocking diode | Eliminates 0.3–0.4V forward drop and associated heat, simplifying layout and improving efficiency in low-VIN applications. |
| PROG-pin current monitoring | Enables real-time charge current readout via microcontroller ADC-supports smart termination algorithms without extra components. |
| Automatic sleep mode | Drains <1µA from battery when VCC is removed, allowing permanent battery connection in always-on dock/cradle designs. |
| Manual shutdown via PROG | Floating PROG pin initiates shutdown within microseconds, enabling host-controlled charge enable/disable with zero PCB area overhead. |
| Thermal and overcurrent protection | Prevents latch-up or damage during high ambient temperature or PNP saturation failure-no external thermal sensor required. |
Applications
| Digital Cameras | Charging Docks & Cradles |
|---|---|
Use Scenario: Compact rechargeable digital camera with USB-powered charging circuit. IC Role / Device Role / Timing Role: Linear Li-ion charger controller regulating 4.2V float and 80mA CC via 7.5kΩ RPROG, interfaced to camera MCU for status reporting. Use Value: Enables small form factor (<5mm² solution area) and precise end-of-charge detection without external sense resistors or diodes. | Use Scenario: Desktop cradle that charges multiple handheld devices simultaneously via dedicated channels. IC Role / Device Role / Timing Role: Standalone CC/CV charger per channel, with PROG pin monitored by cradle MCU to detect full charge and disable charging automatically. Use Value: Reduces BOM cost per channel by eliminating discrete current sense and voltage reference ICs; sleep mode preserves battery during idle periods. |
| Handheld Computers | Low-Cost Portable Chargers |
Use Scenario: Industrial PDA with replaceable Li-ion battery and 5V wall adapter input. IC Role / Device Role / Timing Role: Primary charging controller managing 180mA fast charge (RPROG = 2.1kΩ) and transitioning to CV mode at 4.2V. Use Value: Delivers full charge in ~2.5 hours with <1% float voltage tolerance-meeting OEM battery longevity requirements. | Use Scenario: $10 retail USB battery pack supporting single-cell Li-ion with LED charge indicator. IC Role / Device Role / Timing Role: Cost-optimized charger IC using minimal external parts (RPROG, PNP, two capacitors) and no diode or sense resistor. Use Value: Achieves BOM cost < $0.35 while maintaining 4.2V ±1% accuracy and <1µA shutdown current-critical for price-sensitive mass market. |
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 CC, integrated MOSFET, no external PNP required; SOT-23-5 package. | Higher current, smaller footprint, but lacks PROG-pin current monitoring and manual shutdown flexibility. | Select when higher charge current and integration outweigh need for current telemetry or multi-level shutdown control. |
| BQ24040DRCR | 4.2V float, 800mA CC, integrated P-FET, thermal regulation, pre-charge mode; SON-10 package. | Includes LDO-mode pre-charge, battery temperature monitoring interface, and tighter thermal management-but no analog current monitor output. | Choose for applications requiring pre-charge of deeply discharged batteries or thermal cutoff with NTC interface. |
Compared with MCP73831T-2DCI/OT and BQ24040DRCR, the LTC1734LES6-4.2#TRMPBF offers unique PROG-pin current sensing for closed-loop charge control and ultra-low shutdown current (≤1µA), making it optimal for host-MCU-managed, low-power, and space-constrained Li-ion charging where external PNP use is acceptable.
Availability
LTC1734LES6-4.2#TRMPBF is available at Aetrix Electronics and suitable for digital cameras, charging docks, and handheld computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1734LES6-4.2#TRMPBF 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 LTC portfolio.
The LTC1734L series was designed specifically for cost-sensitive, space-constrained single-cell Li-ion charging applications where external PNP transistor use enables optimized thermal design and flexible current scaling-targeting portable consumer and industrial electronics.
FAQ
What is the exact float voltage accuracy of the LTC1734LES6-4.2#TRMPBF?
The LTC1734LES6-4.2#TRMPBF provides a fixed 4.2V float voltage with ±1% accuracy (4.158V to 4.242V) over –40°C to +85°C ambient temperature and 4.55V to 8V input supply range. This specification is guaranteed by design and verified across process corners-not just typical or room-temperature only.
How is charge current programmed on the LTC1734LES6-4.2#TRMPBF?
Charge current is programmed using a single external resistor (RPROG) between the PROG pin and ground. The relationship is IBAT = 375 / RPROG (with RPROG in ohms and IBAT in amperes). For example, 7.5kΩ yields ~50mA, and 2.1kΩ yields ~180mA. The LTC1734LES6-4.2#TRMPBF uses a 250:1 current scaling architecture to derive this value from the PROG pin current.
Does the LTC1734LES6-4.2#TRMPBF require an external blocking diode?
No, the LTC1734LES6-4.2#TRMPBF does not require an external blocking diode. Its architecture prevents reverse current flow from the battery to the input supply, even when VCC is removed. This eliminates forward voltage drop, heat generation, and PCB area typically associated with discrete diodes in linear charger designs.
What happens to battery drain current when the LTC1734LES6-4.2#TRMPBF is in shutdown mode?
In manual shutdown (PROG pin floated), the LTC1734LES6-4.2#TRMPBF draws ≤1µA from the battery (IBMS). In sleep mode (VCC = 0V), battery drain is also ≤1µA (IBSL). Both modes preserve battery capacity during extended storage or host MCU sleep-critical for always-connected dock and cradle applications.
Can the LTC1734LES6-4.2#TRMPBF be used for NiMH or NiCd battery charging?
Yes-the LTC1734LES6-4.2#TRMPBF can function as a general-purpose constant-current source for NiMH/NiCd charging by grounding the BAT pin to disable the voltage regulation loop. Charge current remains programmable via RPROG (50–180mA range), and termination must be implemented externally (e.g., ΔV, temperature, or timer), as the LTC1734LES6-4.2#TRMPBF does not provide built-in Ni-based chemistry termination logic.
LTC1734LES6-4.2#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- Over Current, Over Temperature
- Charge Current - Max:
- 180mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 8V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1734LES6-4.2#TRMPBF FAQ
1.How can I place an order for LTC1734LES6-4.2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1734LES6-4.2#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC1734LES6-4.2#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1734LES6-4.2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1734LES6-4.2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1734LES6-4.2#TRMPBF?
LTC1734LES6-4.2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1734LES6-4.2#TRMPBF 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#TRMPBF?
For technical support, including LTC1734LES6-4.2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1734LES6-4.2#TRMPBF requirements.
6.How does Aetrix verify that LTC1734LES6-4.2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1734LES6-4.2#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1734LES6-4.2#TRMPBF?
All LTC1734LES6-4.2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1734LES6-4.2#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1734LES6-4.2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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