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Analog Devices Inc. LTC4008EGN-1#PBF
- Part No.:
- LTC4008EGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC4008EGN-1#PBF.pdf
- Description:
- IC BATT CONTRL MULTI-CHEM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
LTC4008EGN-1#PBF from Analog Devices is a synchronous constant-current/constant-voltage battery charger controller for Li-ion, Li-polymer, and multi-chemistry batteries. It delivers up to 4A charge current with ±0.8% voltage accuracy and ±4% current accuracy, operates from 6V–28V input, supports 3V–28V output, and features thermistor-based temperature qualification and AC adapter current limiting. It is used in notebook computers and portable instruments requiring high-efficiency, programmable battery charging.
For engineers reviewing the LTC4008EGN-1#PBF datasheet, LTC4008EGN-1#PBF pinout, LTC4008EGN-1#PBF application, or LTC4008EGN-1#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and current-limiting behavior, real-world efficiency curves at 19V/12.6V inputs, and two field-validated alternative parts with documented functional differences.
Technical Context
The LTC4008EGN-1#PBF implements a synchronous, quasi-constant-frequency, constant-off-time current-mode PWM architecture that avoids audible noise even with ceramic capacitors. Its inner loop uses ITH voltage to regulate peak inductor current, while outer loops manage voltage regulation via VFB and temperature qualification via NTC sampling.
Unlike the base LTC4008, the LTC4008EGN-1#PBF disables the INFET gate driver (Pin 20 NC), removes input FET control logic, and repurposes ACP/SHDN solely as a shutdown input - eliminating AC-present indication and reverse-current protection. Thermistor qualification remains fully active, and all core charging functions (C/10 flag, FAULT latching, ICL monitoring) are retained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Charge Current | 4A - supported by external MOSFETs and sense resistor; full-scale PROG voltage = 1.19V |
| Voltage Accuracy | ±0.8% at 25°C - ensures precise float voltage setting for Li-ion cells (e.g., 12.6V ±101mV) |
| Current Accuracy | ±4% - determined by internal reference and PROG programming resistor tolerance |
| Input Voltage Range | 6V to 28V - accommodates wide-range AC adapters and industrial DC supplies |
| Operating Temp | –40°C to 125°C junction - qualified for extended industrial and automotive-adjacent environments |
| Switching Frequency | 255–345 kHz - enables compact magnetics and low EMI without audible noise |
| Duty Cycle Max | 98% - supports low-dropout operation down to ~0.5V headroom (e.g., 12.6V out from 13.1V in) |
Pinout & Package
Package: 20-lead narrow plastic SSOP (GN), RoHS-compliant, exposed pad not present, θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (1) | Primary power input | Accepts 6–28V supply; bypassed with ≥0.01µF capacitor; powers CLP rail |
| ICL (2) | Input current limit indicator | Active-low open-drain signal asserting when charging current is reduced due to input current limiting |
| ACP/SHDN (3) | Shutdown control input | Open-drain input: pulled high internally; pulling below 1V disables charger (no AC-present function in -1 variant) |
| RT (4) | Thermistor clock timing | Connects 150kΩ resistor to set thermistor sampling interval (~6.7ms sample, 26µs hold) |
| FAULT (5) | Thermal fault indicator | Active-low open-drain output latched low when NTC detects unsafe battery temperature |
| GND (6) | Analog/digital ground reference | Low-power circuit return; separate from PGND to minimize noise coupling into feedback paths |
| VFB (7) | Voltage feedback input | Connects to resistor divider from BATMON to set float voltage using internal 1.19V reference |
| NTC (8) | Thermistor network input | Sampled periodically to detect over/under-temperature; disable via 300–500kΩ resistor to DCIN |
| ITH (9) | Inner-loop current control | 0–3V analog control node; sets peak inductor current; requires 6kΩ + ≥0.1µF compensation network |
| PROG (10) | Charge current programming/monitoring | Resistor-to-GND sets max current; voltage at pin linearly tracks actual current (0.309V = 0A, 1.19V = full scale) |
| CSP (11) | Current sense positive input | Measures voltage across external RSENSE (e.g., 0.025Ω) with CA1 amplifier for peak/average current mode |
| BAT (12) | Battery sense negative reference | Return for CSP; also used as current sense reference and battery voltage monitor baseline |
| BATMON (13) | Battery voltage representation | Switched output proportional to battery voltage; feeds VFB divider; min load = 100kΩ |
| FLAG (14) | C/10 charge completion indicator | Active-low latched output asserting when charge current drops to ≤10% of programmed value |
| CLN (15) | Current limit amplifier negative input | Threshold = VCLP – 100mV; connect to CLP if input current limiting is unused |
| CLP (16) | Current limit reference & IC supply | Serves as positive reference for CL1 amplifier and primary power rail for internal circuitry |
| TGATE (17) | Top PMOS gate driver | Drives external high-side P-channel MOSFET (e.g., Si4431BDY); rise/fall <110ns into 3000pF |
| PGND (18) | Power ground return | High-current return path for BGATE driver; must be routed separately from signal GND |
| BGATE (19) | Bottom NMOS gate driver | Drives external low-side N-channel MOSFET (e.g., FDC645N); 5.6–10V swing, <90ns transitions |
| INFET (20) | Input FET gate driver | No connection (NC) - function disabled in LTC4008EGN-1#PBF; differs from base LTC4008 |
Key Features
| Feature | Design Value |
|---|---|
| Thermistor-based temperature qualification | Automatically suspends/resumes charging based on NTC readings; FAULT pin asserts during unsafe conditions |
| Programmable C/10 charge termination | FLAG pin latches low at ≤10% of programmed current; cleared only by cycling ACP/SHDN |
| AC adapter current limiting | External resistor sets input current threshold; ICL pin signals reduction in real time |
| High-accuracy voltage regulation | ±0.8% float voltage accuracy enables tight cell balancing in multi-cell Li-ion packs |
| Constant-off-time PWM architecture | Eliminates sub-audible switching frequencies; stable with ceramic input/output capacitors |
Applications
| Notebook Computers | Portable Instruments |
|---|---|
Use Scenario: Charging 3S or 4S Li-ion battery packs from universal AC adapters (12–20V). IC Role / Device Role / Timing Role: Primary battery charger controller managing CC/CV profile, thermal safety, and adapter current optimization. Use Value: Enables fast, safe charging up to 4A while maintaining ±0.8% voltage accuracy and automatic temperature suspension per JEITA guidelines. |
Use Scenario: Powering handheld test equipment with swappable Li-ion battery modules. IC Role / Device Role / Timing Role: Standalone charger IC providing programmable current, C/10 termination, and fault signaling to MCU host. Use Value: Reduces BOM count by integrating current sensing, voltage regulation, and thermistor interface - no external op-amps or comparators needed. |
| Battery Backup Systems | Industrial Portable Terminals |
Use Scenario: Maintaining sealed lead-acid or LiFePO₄ backup batteries in telecom or UPS edge devices. IC Role / Device Role / Timing Role: Multi-chemistry charger controller supporting adjustable float voltage and programmable charge current. Use Value: Supports 3V–28V output range and wide input (6–28V), enabling single design to serve multiple battery chemistries and input sources. |
Use Scenario: Ruggedized warehouse scanners and mobile data terminals operating in wide ambient temperatures. IC Role / Device Role / Timing Role: Battery management controller with –40°C to 125°C junction rating and robust thermal qualification. Use Value: Ensures reliable charging across extreme environments without derating, thanks to validated operation at full spec over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4008EGN#PBF | Includes INFET driver (Pin 20 active), supports AC-present detection and reverse-current blocking | Required where input FET control and adapter presence signaling are needed | Select when system requires integrated input FET gate drive and AC adapter status reporting |
| BQ24725ARGRT | TI part with SMBus interface, 5–24V input, 1–4 cell Li-ion support, no thermistor input | Used in systems with host MCU supervision and no standalone thermal qualification | Choose when digital control, telemetry, and host-managed charging profiles are prioritized over analog autonomy |
Compared with LTC4008EGN#PBF, the LTC4008EGN-1#PBF removes INFET functionality but retains identical charging accuracy, thermal safety, and pin-compatible layout - making it ideal for cost-optimized designs where AC-present indication is handled externally. The BQ24725ARGRT offers digital configurability but lacks native NTC support, requiring external circuitry for temperature qualification.
Availability
LTC4008EGN-1#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC4008EGN-1#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 (now part of Analog Devices, Inc. following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC4008 product line was designed specifically for high-efficiency, multi-chemistry battery charging in space-constrained portable and industrial systems - emphasizing precision voltage/current regulation, autonomous thermal safety, and flexible input/output range.
FAQ
What is the key functional difference between LTC4008EGN-1#PBF and LTC4008EGN#PBF?
The LTC4008EGN-1#PBF disables the INFET gate driver (Pin 20 is NC), removing AC-present indication, input FET control, and reverse-current protection. All other charging, thermal, and monitoring functions - including C/10 flag, FAULT latching, ICL signaling, and ±0.8% voltage accuracy - remain identical to the base LTC4008EGN#PBF. This simplifies designs where those input-side protections are implemented externally.
Does LTC4008EGN-1#PBF support thermistor-based temperature qualification?
Yes, LTC4008EGN-1#PBF fully retains the NTC thermistor interface on Pin 8. It samples the thermistor network via RT-timed intervals, suspends charging and asserts the FAULT pin when unsafe temperatures are detected, and automatically resumes when conditions return to safe limits - identical to the base LTC4008 part.
What is the maximum supported charge current for LTC4008EGN-1#PBF?
The LTC4008EGN-1#PBF supports up to 4A charge current, achieved using external PMOS/NMOS switches (e.g., Si4431BDY/FDC645N) and a 0.025Ω sense resistor. The PROG pin voltage scales linearly from 0.309V (0A) to 1.19V (full scale), and current accuracy is ±4% typical, limited by external resistor tolerances and sense resistor drift.
Can LTC4008EGN-1#PBF be used for LiFePO₄ battery charging?
Yes, LTC4008EGN-1#PBF supports LiFePO₄ chemistry via its 3V–28V programmable output range. Float voltage is set using an external resistor divider on BATMON–VFB, allowing precise configuration (e.g., 3.65V/cell × 2S = 7.3V). The ±0.8% voltage accuracy ensures consistent cell balancing without additional calibration.
What package type and lead finish does LTC4008EGN-1#PBF use?
LTC4008EGN-1#PBF uses a 20-lead narrow plastic SSOP (GN package) with lead-free (Pb-free) finish, marked "LTC4008EGN-1". It is rated for –40°C to 125°C junction temperature, has θJA = 90°C/W, and complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3.
LTC4008EGN-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
LTC4008EGN-1#PBF FAQ
1.How can I place an order for LTC4008EGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4008EGN-1#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 LTC4008EGN-1#PBF reliable?
The price and inventory of LTC4008EGN-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4008EGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4008EGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4008EGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4008EGN-1#PBF?
LTC4008EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4008EGN-1#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 LTC4008EGN-1#PBF?
For technical support, including LTC4008EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4008EGN-1#PBF requirements.
6.How does Aetrix verify that LTC4008EGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4008EGN-1#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 LTC4008EGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4008EGN-1#PBF?
All LTC4008EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4008EGN-1#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 LTC4008EGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC4008EGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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