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Analog Devices Inc. LTC1980EGN#PBF
- Part No.:
- LTC1980EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1980EGN#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,209
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Product details
Overview
LTC1980EGN#PBF from Analog Devices (formerly Linear Technology) is a highly integrated combination Li-Ion battery charger and current-mode flyback DC/DC converter IC. It supports simultaneous wall adapter-powered system operation and battery charging, delivers up to 10W output, provides pin-selectable 4.1V/4.2V/8.2V/8.4V float voltages, and operates across 2.85V–10V input ranges for both VBAT and VREG. It is used in portable power systems requiring uninterrupted supply, such as digital cameras and handheld computers.
For engineers reviewing the LTC1980EGN#PBF datasheet, LTC1980EGN#PBF pinout, LTC1980EGN#PBF application, or LTC1980EGN#PBF equivalent, key selection considerations include its dual-function topology, 300kHz current-mode PWM control, programmable charge termination timer, LDO controller capability, and 24-pin SSOP package with validated gate drive outputs for external BAT-FET and REG-FET MOSFETs.
Technical Context
The LTC1980EGN#PBF implements a bidirectional flyback topology enabling shared transformer usage between battery charging and regulated DC/DC conversion. Its inner current-mode loop (VC pin) controls both functions using slope-compensated PWM with 260–340kHz switching frequency and <10ns driver transition times.
It integrates independent feedback paths: REGFB sets regulated output voltage (1.225V reference), LDOFB programs external LDO output, OVP enables custom float voltage via external divider, and BATT1/BATT2 pins select standard Li-Ion charge voltages. Burst Mode® is pin-programmable per operating mode and disabled during charging to minimize EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Current-mode flyback with shared transformer for charger + regulator functions |
| Switching Frequency | 260–340kHz - enables compact magnetics and predictable EMI profile |
| Voltage Reference | 1.225V ±3.1mV - precise regulation setpoint for REGFB, PROGT, LDOFB, and OVP loops |
| Float Voltage Options | 4.1V / 4.2V / 8.2V / 8.4V - selected by BATT1/BATT2 logic; supports 1–2 cell Li-Ion configurations |
| Charge Termination | Programmable timer (CTIMER = 0.25 × time in hours) + C/10 detection - ensures safe full-charge cutoff |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and portable equipment environments |
| Package | 24-pin narrow SSOP (GN) - 0.64mm pitch, 8.7mm × 4.0mm footprint, θJA = 85°C/W |
Pinout & Package
24-pin narrow plastic SSOP (GN) package with exposed thermal pad (not electrically connected). Pin 1 marked by dot; pin numbering counterclockwise from top-left corner. GND (Pin 20) and PGND (Pin 12) require separate Kelvin routing to RSENSE for accurate current sensing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PROG (1) | Constant-current programming input | Sets full-charge current via resistor to PROGT; connects to open-drain MOSFET for CC mode control |
| PROGT (2) | Trickle-charge programming input | Sets pre-charge current; RC network to VC provides CC-loop compensation |
| REGFB (3) | DC/DC converter feedback node | 1.225V reference point for output voltage setting; external resistor divider from VREG defines regulated output |
| VC (4) | Inner-loop control voltage | Common current-mode PWM control signal for both charger and regulator; duty cycle scales with VC level |
| LDOFB (5) | LDO feedback input | 1.225V reference for external PMOS LDO; resistor divider from LDO output sets regulated LDO voltage |
| LDODRV (6) | LDO error amplifier output | Drives gate of external PMOS pass transistor; pulled high to VREG when MODE = GND or UVLO active |
| VREG (7) | Regulator output connection | High-side node of DC/DC converter; connects to transformer primary and external REG-FET drain |
| WA (8) | Wall adapter presence comparator input | Detects adapter voltage via external divider; threshold > VREG to prevent false shutdown during regulation |
| BATT1/BATT2 (9,10) | Li-Ion float voltage select inputs | Logic-controlled selection of 4.1V/4.2V/8.2V/8.4V; open BATT1 enables OVP-based custom float voltage |
| RGTDR (11) | Regulator-side gate driver output | Drives external N-channel REG-FET; 10ns transitions support efficient high-frequency switching |
| PGND (12) | Power ground return | Low-impedance return path for transformer primary current and gate drive sink current |
| VBIAS1 (13) | Internal bias rail | ~5V internal supply; must be bypassed with ≥1µF ceramic capacitor to PGND; no external load allowed |
| BGTDR (14) | Battery-side gate driver output | Drives external N-channel BAT-FET; synchronized with RGTDR for bidirectional flyback operation |
| REG (15) | Bidirectional mode control | Open = charger mode; weak pull-down = battery conditioning; strong pull-down = forced regulator mode |
| MODE (16) | Operating mode selector | Configures Burst Mode® (open/1) vs continuous (0) for regulator; enables/disables charger (0 = disable) |
| TIMER (17) | Charge termination timing capacitor | Capacitor value sets total charge time: C(µF) = 0.25 × t(hours); also sets soft-start ramp rate |
| VBAT (18) | Battery positive terminal connection | Input for battery-side transformer winding; supports 2.85–10V range with undervoltage lockout at 2.45–2.85V |
| VBIAS2 (19) | Secondary internal bias rail | ~1.2V internal reference; used as logic high for BATT1/BATT2; bypass with ≥1µF ceramic to PGND |
| GND (20) | Signal ground reference | Kelvin-connected to ISENSE and RSENSE; separates analog reference from power ground noise |
| ISENSE (21) | Current sense amplifier input | Connects to low-side current sense resistor; zero-current comparator enables trickle-to-CC transition |
| CAOUT (22) | Current amplifier output | Drives PROGT resistor network; closed-loop gain = 2.44 V/V for precise current programming |
| OVP (23) | Overvoltage protection input | Accepts external voltage divider across battery; enables nonstandard float voltages and adjusts OVP thresholds |
| SS (24) | Soft-start and float-voltage compensation | Capacitor to ground sets battery charge ramp rate and compensates float voltage control loop |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charger + regulator | Single IC replaces two controllers and reduces PCB area by sharing transformer, snubbers, and feedback components |
| Pin-selectable Li-Ion float voltages | 4.1V/4.2V/8.2V/8.4V via BATT1/BATT2 logic eliminates need for external DAC or microcontroller configuration |
| Programmable charge termination | Timer-based cutoff plus C/10 detection prevents overcharge; shorted-cell detection (2.55–5.65V thresholds) enhances safety |
| Simultaneous charging & regulation | LDO controller (LDODRV/LDOFB) allows wall adapter to power system load while charging battery without interruption |
| Current-mode flyback architecture | 300kHz fixed-frequency PWM with slope compensation ensures stable operation across wide input/output ranges and load transients |
| Low-noise Burst Mode® | Pin-enabled Burst Mode® only during regulator operation; disabled during charging to avoid broadband EMI in sensitive analog sections |
Applications
| Digital Cameras | Handheld Computers |
|---|---|
|
Use Scenario: Portable camera powered by single/dual Li-Ion cells with AC adapter charging capability and uninterrupted operation during hot-swap. IC Role / Device Role / Timing Role: LTC1980EGN#PBF acts as bidirectional power manager-charging battery from wall adapter while powering image sensor, processor, and display from same source. Use Value: Eliminates need for separate charger and DC/DC ICs; enables compact design with fast transient response (<200µs load step recovery) and <1% load regulation. |
Use Scenario: Battery-backed PDA or rugged handheld with wall adapter input, requiring seamless transition between AC and battery power without system reset. IC Role / Device Role / Timing Role: LTC1980EGN#PBF serves as uninterruptible power supply core-regulating 3.3V system rail from battery when adapter is removed, while recharging battery when adapter reconnects. Use Value: Achieves >85% efficiency at 500mA load (VBAT=3.6V); supports automatic recharge at 200mV delta below float voltage, extending battery life. |
| Personal Digital Assistants | 1W–10W Uninterruptible Power Supplies |
|
Use Scenario: Low-power PDA with NiMH/NiCd compatibility, requiring user-programmable charge profiles and low quiescent current during standby. IC Role / Device Role / Timing Role: LTC1980EGN#PBF functions as universal battery management IC-supporting Li-Ion, NiMH, and NiCd chemistries via PROG/PROGT programming and BATT1/BATT2 logic. Use Value: Quiescent supply current as low as 15µA in shutdown mode; programmable trickle charge prevents damage to deeply discharged cells. |
Use Scenario: Compact UPS module for embedded industrial controllers, needing reliable backup power with configurable charge voltage and wall adapter detection. IC Role / Device Role / Timing Role: LTC1980EGN#PBF operates as standalone power architecture-detecting wall adapter presence (WA pin), initiating charge only above threshold, and maintaining regulated output during brownout. Use Value: Undervoltage lockout hysteresis (100mV) prevents oscillation near dropout; wall adapter comparator rejects ripple via VIH1/VIL1 specs (±3.6mV window). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger + DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8605ETL+T | Integrates synchronous buck regulator + linear charger; no flyback topology; fixed 4.2V float; no BATT1/BATT2 selection | Best suited for low-cost, low-power (<2W) single-cell applications where transformer isolation is unnecessary | Select MAX8605ETL+T when board space is extremely constrained and isolated flyback is not required for VADAPTER > VBAT support. |
| TPS65023RSBR | Triple-output PMIC with dedicated Li-Ion charger + dual DC/DC converters; no shared flyback; fixed 4.2V float; 48-pin QFN | Targeted at multi-rail portable SoC platforms (e.g., OMAP, i.MX) requiring multiple regulated supplies beyond main system rail | Choose TPS65023RSBR when powering complex processors with multiple voltage domains and integrated fuel gauging is needed. |
Compared with MAX8605ETL+T and TPS65023RSBR, the LTC1980EGN#PBF uniquely supports bidirectional flyback operation enabling wall adapter voltages both above and below battery voltage, offers four factory-set float voltages via logic pins, and delivers higher power capability (up to 10W) in a smaller 24-pin SSOP footprint.
Availability
LTC1980EGN#PBF is available at Aetrix Electronics and suitable for digital cameras, handheld computers, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C ambient conditions.
Supply support for LTC1980EGN#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 technical and manufacturing continuity for all Linear ICs, including precision power management products.
The LTC1980EGN#PBF belongs to Linear's legacy high-efficiency portable power management product line, designed specifically for space-constrained battery-powered systems requiring combined charging and regulation without compromising safety or transient performance.
FAQ
What is the maximum supported battery voltage for the LTC1980EGN#PBF?
The LTC1980EGN#PBF supports battery input voltages from 2.85V to 10V, with absolute maximum rating of 12V on the VBAT pin. Its overvoltage protection circuitry activates based on the OVP pin voltage, which can be scaled via external resistors to accommodate custom float voltages up to 8.4V for 2-cell Li-Ion configurations. The device is rated for continuous operation across the full industrial temperature range of –40°C to +85°C.
How does the LTC1980EGN#PBF handle simultaneous charging and system power delivery?
The LTC1980EGN#PBF uses a bidirectional flyback topology that allows power from the wall adapter to simultaneously charge the battery and supply the system load through an optional external LDO stage. When the wall adapter is present, the IC operates in charger mode while routing excess power to the VREG rail; the LDODRV and LDOFB pins enable a user-configurable PMOS-based LDO to provide clean, regulated power to sensitive system components without interruption.
Can the LTC1980EGN#PBF be used with NiMH or NiCd batteries?
Yes, the LTC1980EGN#PBF supports NiMH and NiCd battery chemistries through user-programmable constant-current charging via the PROG and PROGT pins. Unlike Li-Ion mode, NiMH/NiCd charging relies on voltage-based termination and temperature monitoring (not integrated), so external supervision is recommended. The device provides open-drain C/10 and wall plug detect outputs to assist in implementing full-charge detection and adapter presence logic.
What is the purpose of the MODE pin on the LTC1980EGN#PBF?
The MODE pin on the LTC1980EGN#PBF configures operating behavior for both charger and regulator functions: grounded disables both modes; left open enables continuous operation for charging and Burst Mode® for regulation; pulled high enables continuous operation for both. Burst Mode® is automatically disabled during battery charging to reduce EMI, and the pin must be decoupled with a 200pF capacitor to ground when left floating to ensure noise immunity.
How is charge termination implemented in the LTC1980EGN#PBF?
The LTC1980EGN#PBF implements dual-stage charge termination: first, a programmable timer (set by capacitor on TIMER pin) defines maximum charge duration; second, a C/10 current comparator monitors CAOUT to detect when charge current drops to 10% of programmed value. Both conditions must be satisfied to terminate charging. Additional safeguards include shorted-cell detection (2.55–5.65V thresholds) and automatic recharge triggered when battery voltage falls 200–400mV below float voltage.
LTC1980EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 8.4V
- Voltage - Supply (Max):
- 10V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1980EGN#PBF FAQ
1.How can I place an order for LTC1980EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1980EGN#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 LTC1980EGN#PBF reliable?
The price and inventory of LTC1980EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1980EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1980EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1980EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1980EGN#PBF?
LTC1980EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1980EGN#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 LTC1980EGN#PBF?
For technical support, including LTC1980EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1980EGN#PBF requirements.
6.How does Aetrix verify that LTC1980EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1980EGN#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 LTC1980EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1980EGN#PBF?
All LTC1980EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1980EGN#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 LTC1980EGN#PBF part is unused and in its original packaging.
Return procedure for LTC1980EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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