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Analog Devices Inc. LT1512CN8#PBF
- Part No.:
- LT1512CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1512CN8#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 1CEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,103
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Product details
Overview
LT1512CN8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz current-mode switching regulator IC optimized for constant-current/constant-voltage battery charging in SEPIC or flyback topologies. It integrates dual feedback paths (voltage via FB pin, current via IFB pin), supports input voltages from 2.4V to 30V, delivers up to 1A charging current for single Li-ion cells, and features 1% voltage accuracy and ground-referenced current sensing. It is used in wall-adapter-powered portable battery chargers requiring input-to-battery voltage flexibility.
For engineers reviewing the LT1512CN8#PBF datasheet, LT1512CN8#PBF pinout, LT1512CN8#PBF application, or LT1512CN8#PBF equivalent, key selection considerations include its 1.5A internal switch current limit, –100mV current sense reference at IFB, 1.245V bandgap voltage reference at FB, thermal-limited operation in PDIP-8 package, and dual-function S/S pin supporting both shutdown and 600–800kHz synchronization.
Technical Context
The LT1512CN8#PBF implements current-mode control with an internal 500kHz oscillator, adaptive anti-saturation driver, and dual-input error amplifier that simultaneously regulates output voltage (via FB) and charging current (via IFB). Its VC pin serves as both compensation node and current-limit control interface, with peak switch current scaling linearly from 0A to 1.8A as VC rises from 1.0V to 1.9V.
It employs separate GND and GND S pins to isolate high-current switch return from sensitive analog ground, enabling stable operation in noisy battery-charging environments. The IC includes a 2.3V low-dropout internal regulator powering all circuitry, allowing operation down to 2.4V input while maintaining full functionality across 0°C to 70°C ambient temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz typical; minimizes external inductor size (e.g., 33 µH) and enables compact SEPIC charger designs. |
| Max Switch Current | 1.5 A at 50% duty cycle; sets practical charging current ceiling of ~1 A for single Li-ion cell under thermal limits. |
| Voltage Reference (FB) | 1.245 V ±12 mV; defines precise float voltage for Li-ion (e.g., 4.1 V or 4.2 V) via R1/R2 divider with <1% regulation accuracy. |
| Current Sense Reference (IFB) | –100 mV typical; enables accurate constant-current regulation independent of battery voltage, using ground-referenced sense resistor (e.g., 0.2 Ω → 500 mA). |
| Input Voltage Range | 2.4 V to 30 V; supports wide-input wall adapters and allows charging even when VIN < VBAT (SEPIC advantage). |
| Supply Current (IQ) | 4–5.5 mA typical; determines quiescent power loss in active charging mode; drops to 12 µA in shutdown. |
| Thermal Resistance (θJA) | 100 °C/W (PDIP-8); requires careful PCB copper area planning to maintain TJ ≤ 125°C at full load. |
Pinout & Package
LT1512CN8#PBF is housed in an 8-lead narrow-body plastic DIP (PDIP-8, N8 package), with 0.300-inch width and through-hole mounting. Thermal resistance is 100°C/W (θJA), and maximum junction temperature is 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier output / current limit control | Compensation node; sets peak switch current (0–1.8 A) and enables soft-start; must be bypassed to GND S with RC network. |
| FB | Voltage feedback input | Inverting input of voltage error amp; referenced to 1.245 V internal bandgap; senses battery voltage via resistive divider. |
| IFB | Current feedback input | Inverting input of current sense amp; regulated at –100 mV during CC mode; accepts ground-referenced sense signal. |
| S/S | Shutdown / synchronization input | Logic-compatible pin; low = shutdown (12 µA IQ); 600–800 kHz AC signal = frequency sync; floats high by default. |
| VSW | Internal switch collector | Carries up to 1.5 A pulsed current; connects to SEPIC coupling capacitor and diode; requires short, low-inductance trace. |
| GND | Power ground | Return path for switch current; must connect directly to PCB ground plane near VSW and C1/C2. |
| GND S | Analog/control ground | Return for FB, IFB, VC, and S/S circuits; isolated from GND to prevent noise coupling into feedback paths. |
| VIN | Input supply | Accepts 2.4–30 V DC; must be bypassed with low-ESR capacitor (e.g., 22 µF tantalum) placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual feedback architecture | Simultaneous regulation of battery voltage (FB) and charging current (IFB) enables true CC/CV Li-ion charging without external op-amps. |
| Ground-referenced current sensing | IFB pin regulates at –100 mV, eliminating need for high-side current sense amplifiers or isolated sense paths - simplifies layout and reduces BOM cost. |
| SEPIC topology optimization | Supports VIN < VBAT, VIN = VBAT, or VIN > VBAT; prevents battery discharge when off; removes snubber losses common in flyback designs. |
| Integrated anti-saturation driver | Monitors switch saturation onset in real time and adjusts drive current to minimize VCE(sat) and ensure fast turn-off - improves efficiency and thermal performance. |
| Separate GND/GND S pins | Physically isolates high-di/dt switch return from precision analog ground, preventing ground bounce from corrupting FB/IFB measurements. |
Applications
| Smartphone/Tablet Wall Charger | Industrial Portable Tool Battery Pack |
|---|---|
Use Scenario: Charging single-cell or dual-cell Li-ion packs from universal AC/DC adapters (5–24 V output). IC Role / Device Role / Timing Role: Primary CC/CV controller managing SEPIC power stage; regulates float voltage to ±1% and charge current to ±3% over line/load/temp. Use Value: Enables compact, adapter-agnostic charging with no minimum VIN constraint - critical for global multi-voltage adapter compatibility. |
Use Scenario: On-board charging of 7.4 V or 8.4 V Li-ion packs in cordless power tools with variable input (e.g., 12–24 V vehicle supply). IC Role / Device Role / Timing Role: Constant-current/constant-voltage battery management IC; handles dynamic input transients and maintains safe charge termination under varying thermal conditions. Use Value: Eliminates need for external current-sense isolation or high-side sensing, reducing component count and improving reliability in vibration-prone environments. |
| Medical Handheld Diagnostic Device | Emergency Lighting Backup System |
Use Scenario: Recharging sealed Li-ion batteries in portable ultrasound or glucose monitors powered by USB or proprietary DC inputs. IC Role / Device Role / Timing Role: Precision battery charger IC with programmable shutdown and sync capability; interfaces with host MCU for state reporting and charge profile adjustment. Use Value: Ground-referenced IFB allows direct connection to battery pack's negative terminal - avoids floating sense nodes and simplifies safety-critical isolation design. |
Use Scenario: Maintaining lead-acid or LiFePO₄ backup batteries in LED emergency lights powered from 12–24 V building supply rails. IC Role / Device Role / Timing Role: Dual-mode charger IC supporting NiCd/NiMH/Li-ion/lead-acid chemistries via simple resistor programming of CV/CC thresholds. Use Value: Single IC supports multiple battery types without firmware change - reduces inventory complexity and enables field-upgradable charge profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | External MOSFET controller (no integrated switch); supports higher power (up to 3 A), wider VIN (up to 36 V), and multi-cell configurations. | Requires external N-channel MOSFET and gate driver; suited for >1 A or >2-cell applications where LT1512CN8#PBF's 1.5 A switch limit is insufficient. | Select LTC4000-1 when scaling beyond single-cell Li-ion or needing programmable charge termination algorithms not available in LT1512CN8#PBF. |
| MAX1771 | Fixed 300 kHz frequency; no IFB pin - uses single FB loop with current-sense resistor in high-side path; lower accuracy (±2% CV, ±5% CC). | Lacks ground-referenced current sensing; requires high-side sense resistor and additional op-amp for CC regulation in most implementations. | Choose MAX1771 only for cost-sensitive, lower-accuracy NiCd/NiMH applications where ground-referenced sensing is not required. |
Compared with LTC4000-1 and MAX1771, the LT1512CN8#PBF uniquely integrates both voltage and current feedback paths with ground-referenced IFB, enabling simpler, more accurate single-cell Li-ion charging in space-constrained PDIP-8 layouts - without external MOSFETs or high-side sensing components.
Availability
LT1512CN8#PBF is available at Aetrix Electronics and suitable for industrial portable tool battery packs, medical handheld diagnostic devices, and emergency lighting backup systems requiring stable component supply, long-term manufacturability, and RoHS-compliant through-hole assembly.
Supply support for LT1512CN8#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 legacy Linear products including the LT1512 family.
The LT1512 product line was designed specifically for high-accuracy, topology-flexible battery charging in cost-sensitive, space-constrained applications - emphasizing ground-referenced current sensing, SEPIC compatibility, and robust thermal behavior in PDIP and SO packages.
FAQ
What is the maximum battery voltage supported by the LT1512CN8#PBF?
The LT1512CN8#PBF itself does not impose a direct battery voltage limit; instead, system-level constraints apply. Its maximum switch voltage is 40 V, and maximum input voltage is 30 V. Therefore, maximum battery voltage is limited to 40 V minus input voltage (VBAT ≤ 40 V – VIN). For example, with VIN = 12 V, VBAT may reach up to 28 V - sufficient for up to 7-series Li-ion cells or 24 V lead-acid systems. The LT1512CN8#PBF's FB divider and IFB loop remain functional across this range.
Can the LT1512CN8#PBF charge batteries with input voltage lower than battery voltage?
Yes, the LT1512CN8#PBF is explicitly designed for this use case via SEPIC topology support. Unlike buck or linear chargers, it operates with VIN < VBAT, VIN = VBAT, or VIN > VBAT. This is enabled by its ground-referenced IFB pin and dual-loop control architecture - allowing continuous constant-current regulation regardless of relative input/battery voltage levels. The LT1512CN8#PBF datasheet confirms operation down to VIN = 2.4 V while charging an 8.2 V dual-cell Li-ion pack.
How is charging current programmed on the LT1512CN8#PBF?
Charging current is set by the value of the ground-referenced sense resistor (R3) connected to the IFB pin: ICHRG = 0.1 V / R3. For example, R3 = 0.2 Ω yields 500 mA. The LT1512CN8#PBF's IFB pin regulates at –100 mV during constant-current mode, making current setting highly accurate and independent of VIN or VBAT. Optional PWM-based programming (via peak detector + resistor network) can dynamically adjust current between ~20% and 100% of full scale without changing R3.
Does the LT1512CN8#PBF require external compensation components?
Yes, the LT1512CN8#PBF requires external compensation on the VC pin. A capacitor (e.g., 1 nF) or series RC network must be connected from VC to GND S to stabilize the dual-loop control system. The datasheet specifies that the VC node is the output of the error amplifier and input to the current comparator - so proper compensation is essential for stability across line, load, and temperature. Layout best practice mandates routing this network directly to GND S (not GND) to avoid ground-loop injection.
What is the purpose of the separate GND and GND S pins on the LT1512CN8#PBF?
The LT1512CN8#PBF uses separate GND (power ground) and GND S (signal ground) pins to isolate high-di/dt switch return currents from sensitive analog feedback paths (FB, IFB, VC). Fast-switching currents flowing through GND would otherwise induce voltage spikes on shared ground traces, corrupting the 1.245 V reference and –100 mV current sense threshold. Both pins must connect to the same low-impedance ground plane, but external components (R1/R2 divider, R4/C4 filter, compensation network) must tie exclusively to GND S - ensuring measurement integrity. This separation is critical to achieving the LT1512CN8#PBF's specified 1% voltage accuracy.
LT1512CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 25V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1512CN8#PBF FAQ
1.How can I place an order for LT1512CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1512CN8#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 LT1512CN8#PBF reliable?
The price and inventory of LT1512CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1512CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1512CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1512CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1512CN8#PBF?
LT1512CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1512CN8#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 LT1512CN8#PBF?
For technical support, including LT1512CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1512CN8#PBF requirements.
6.How does Aetrix verify that LT1512CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1512CN8#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 LT1512CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1512CN8#PBF?
All LT1512CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1512CN8#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 LT1512CN8#PBF part is unused and in its original packaging.
Return procedure for LT1512CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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