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Analog Devices Inc. LT1512CS8#TRPBF
- Part No.:
- LT1512CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1512CS8#TRPBF.pdf
- Description:
- IC BATT CHG MULT-CHEM 1CEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,443
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Product details
Overview
LT1512CS8#TRPBF 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 features 1.245V voltage reference accuracy (±1%), –100mV current sense threshold, 1.5A maximum switch current, and ground-referred current sensing - enabling single Li-ion cell charging up to 1A with input voltage below, equal to, or above battery voltage.
For engineers reviewing the LT1512CS8#TRPBF datasheet, LT1512CS8#TRPBF pinout, LT1512CS8#TRPBF application, or LT1512CS8#TRPBF equivalent, key selection considerations include its dual feedback architecture (FB for voltage, IFB for current), separate GND/GND S pins for noise isolation, VC pin for loop compensation and soft-start, and S/S pin supporting both shutdown and 600–800kHz synchronization - all critical for precision battery charger design in portable and industrial systems.
Technical Context
The LT1512CS8#TRPBF implements current-mode control with two independent feedback paths: FB senses output voltage via a resistive divider referenced to a 1.245V internal bandgap, while IFB senses charging current through an external sense resistor, regulating to –100mV during constant-current mode. Its oscillator operates at 500kHz (±10%) with adaptive anti-saturation logic driving an integrated NPN switch rated for 40V breakdown and 0.5Ω typical ON resistance.
Thermal design centers on the SO-8 (S8) package's 130°C/W junction-to-ambient thermal resistance; power dissipation combines quiescent supply current (5.5mA max), switch conduction loss (I²×RSW), and switching loss. The dual-ground architecture (GND for high-current switch return, GND S for low-noise control circuitry) isolates fast-switching transients from sensitive analog inputs like FB and IFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz ±10% - enables compact magnetics (e.g., 33µH inductors) and reduces EMI filtering burden. |
| Voltage Reference (VREF) | 1.245V ±1% - ensures ±1% constant-voltage regulation for Li-ion float voltage (e.g., 4.2V ±0.042V). |
| Current Sense Threshold (VIREF) | –100mV ±7mV - sets precise constant-current level (e.g., 1A with 0.1Ω sense resistor). |
| Max Switch Current | 1.5A - supports up to 1A battery charge current in single-cell Li-ion applications. |
| Input Voltage Range | 2.7V to 30V - allows operation from USB, wall adapters, or automotive sources; SEPIC topology permits VIN < VBAT. |
| Supply Current (IQ) | 5.5mA max - defines light-load efficiency and thermal budget in continuous operation. |
| Shutdown Current | 50µA max - minimizes battery drain during system sleep or fault conditions. |
Pinout & Package
LT1512CS8#TRPBF uses the 8-lead plastic SO (S8) surface-mount package, measuring 4.9mm × 6.0mm × 1.75mm (JEDEC MS-012), with exposed pad optional for thermal enhancement. Pin 1 is marked by a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier output / compensation node | Controls peak switch current (0–1.8A as VC varies 1–1.9V); connects to RC network for loop stability and soft-start. |
| FB | Voltage feedback input (inverting) | Senses output voltage via R1/R2 divider; referenced to 1.245V internal bandgap; bias current ≤600nA. |
| IFB | Current feedback input | Regulates to –100mV during CC mode; 5kΩ input impedance; requires low-R filter (e.g., 24Ω + 0.22µF) for clean DC signal. |
| S/S | Shutdown/synchronization input | Logic-compatible: low = shutdown (12µA IQ); 600–800kHz AC = frequency sync; floats high for normal operation. |
| VSW | Switch collector output | Drives external inductor/diode; carries up to 1.5A pulsed current; requires short, low-inductance PCB trace. |
| GND | Power ground (switch return) | Carries high di/dt switch current; must connect directly to ground plane near VSW path. |
| GND S | Signal ground (control circuitry) | Isolates FB, IFB, VC, and S/S from switching noise; external components tie here or adjacent ground point. |
| VIN | Input supply | 2.7–30V input; bypassed with low-ESR capacitor (e.g., 22µF tantalum) placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent feedback loops | Separate FB (voltage) and IFB (current) inputs enable true CC/CV regulation without interaction or calibration drift. |
| Ground-referred current sensing | IFB referenced to GND S eliminates need for high-side current sense amplifiers or isolated sense paths - simplifying layout and reducing BOM cost. |
| SEPIC topology support | Enables charging when input voltage is lower than battery voltage (e.g., 5V USB charging 8.4V 2S Li-ion), with no discharge path when disabled. |
| Integrated 500kHz oscillator & anti-saturation driver | Reduces external component count; adaptive driver minimizes switch turn-off time and conduction loss (RSW = 0.5Ω typ). |
| Separate GND and GND S pins | Prevents switch-induced ground bounce from corrupting voltage/current feedback signals - critical for <1% regulation accuracy. |
Applications
| USB-Powered Portable Charger | Industrial Lead-Acid Maintenance Charger |
|---|---|
Use Scenario: Charging single-cell Li-ion batteries (3.0–4.2V) from 5V USB sources in handheld medical devices or IoT sensors. IC Role / Device Role / Timing Role: LT1512CS8#TRPBF acts as the primary CC/CV controller, managing SEPIC power stage to deliver 0.5A constant current then hold 4.2V float voltage. Use Value: Enables full charging even when USB input sags to 4.5V - impossible with buck-only chargers - while maintaining ±1% voltage accuracy for battery longevity. | Use Scenario: Float-charging 6V/12V sealed lead-acid batteries in remote telemetry units powered by 12–24V solar or backup supplies. IC Role / Device Role / Timing Role: LT1512CS8#TRPBF configures SEPIC stage to regulate 13.8V output at 0.2A constant current, transitioning to constant-voltage mode with temperature-compensated voltage limit. Use Value: Input voltage flexibility allows direct connection to unregulated solar panels; ground-referenced current sense avoids costly isolated amplifiers in harsh industrial environments. |
| Multi-Chemistry Battery Charger | Programmable Lab Power Supply |
Use Scenario: Universal benchtop charger supporting NiMH (1.45V/cell), Li-ion (4.2V/cell), and lead-acid (2.3V/cell) via front-panel voltage/current selection. IC Role / Device Role / Timing Role: LT1512CS8#TRPBF provides core regulation; microcontroller adjusts R1/R2 divider and IFB filter to reconfigure CC/CV thresholds per chemistry. Use Value: Single IC platform replaces multiple dedicated chargers; programmable current limit (via VC or PWM on IFB) enables 100–1000mA range without hardware change. | Use Scenario: Low-noise, adjustable 0–15V / 0–1A bench supply for analog circuit validation, where ripple and regulation stability are critical. IC Role / Device Role / Timing Role: LT1512CS8#TRPBF serves as the regulated output stage; VC pin driven by DAC for precise voltage programming; IFB used for current limiting. Use Value: 500kHz switching yields <10mVpp output ripple after LC filtering; dual feedback ensures <0.1% load regulation and <0.05% line regulation. |
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 | Wider VIN range (2.7–36V), higher switch current (3A), supports multi-cell Li-ion with external MOSFETs; requires external sense resistor and gate drivers. | Targeted at high-power (>2A), multi-cell, or high-voltage battery systems; lacks integrated switch - needs external N-channel FETs. | Select LTC4000-1 when scaling beyond 1A or requiring >40V battery voltage; LT1512CS8#TRPBF remains optimal for cost-sensitive, single-cell, integrated-switch designs. |
| TPS650532 | Lower IQ (25µA shutdown), integrated LDOs, I²C interface; fixed 4.2V/8.4V/12.6V Li-ion profiles; no SEPIC support - only buck-boost. | Designed for space-constrained, feature-rich portable devices (e.g., tablets); lacks analog programmability and ground-referenced current sense. | Choose TPS650532 for production-ready, digitally controlled single/dual-cell charging; retain LT1512CS8#TRPBF for analog-programmable, SEPIC-based designs demanding input voltage flexibility. |
Compared with LTC400532 and LTC4000-1, the LT1512CS8#TRPBF uniquely combines integrated 1.5A switch, ground-referenced current sensing, and native SEPIC support - making it the only option among the three that enables true VIN < VBAT operation without external FETs or digital controllers.
Availability
LT1512CS8#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable chargers, industrial lead-acid maintenance systems, multi-chemistry battery test equipment, and programmable lab power supplies requiring stable component supply across long production cycles.
Supply support for LT1512CS8#TRPBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1512CS8#TRPBF belongs to Linear's legacy battery charger IC product line, designed specifically for analog-controlled, topology-flexible (SEPIC/flyback) constant-current/constant-voltage charging - prioritizing precision, noise immunity, and input voltage versatility over digital interfaces or ultra-low quiescent current.
FAQ
What is the maximum battery voltage supported by the LT1512CS8#TRPBF in a SEPIC configuration?
The LT1512CS8#TRPBF itself has a 40V maximum switch voltage rating. In a SEPIC topology, VSW = VIN + VBAT, so maximum battery voltage is limited to 40V – VIN. With the LT1512CS8#TRPBF's 30V absolute maximum input voltage, the practical upper limit for VBAT is 30V - confirmed in the datasheet's "Charges Any Number of Cells Up to 30V" feature. For example, at VIN = 12V, VBAT may reach 28V.
Can the LT1512CS8#TRPBF be used in buck or boost topologies?
No - the LT1512CS8#TRPBF is architecturally optimized for SEPIC and flyback topologies only. Its IFB pin is designed for ground-referenced current sensing, which is inherent to those topologies. Buck or boost configurations require high-side current sensing or isolated amplifiers incompatible with the LT1512CS8#TRPBF's pinout and internal current amplifier gain (–12.5×). Using it outside SEPIC/flyback violates the intended operating conditions and voids performance guarantees.
How does the dual-ground (GND and GND S) design improve regulation accuracy in the LT1512CS8#TRPBF?
The LT1512CS8#TRPBF separates high-current switch return (GND) from low-noise control circuitry ground (GND S) to prevent di/dt-induced voltage spikes on the power ground from modulating the FB and IFB reference points. This isolation maintains the 1.245V bandgap reference and –100mV current threshold integrity, directly enabling the specified ±1% voltage accuracy and stable CC/CV transition - especially critical under dynamic load or high-ripple input conditions.
What is the purpose of the VC pin on the LT1512CS8#TRPBF, and how is it used for current limiting?
The VC pin on the LT1512CS8#TRPBF is the error amplifier output, setting the peak switch current threshold. As VC voltage rises from 1.0V to 1.9V, programmed switch current increases linearly from 0A to 1.8A. Applying an external voltage or current source to VC (e.g., via DAC or PWM-filtered signal) allows precise analog current limiting - distinct from the fixed –100mV IFB threshold - making the LT1512CS8#TRPBF adaptable for programmable charge profiles beyond standard CC/CV.
Does the LT1512CS8#TRPBF support automatic transition between constant-current and constant-voltage modes?
Yes - the LT1512CS8#TRPBF performs fully autonomous CC/CV handoff using its dual feedback architecture. During charging, the IFB loop dominates and regulates current until battery voltage reaches the FB-set threshold (e.g., 4.2V); then the FB loop takes control and holds voltage constant while current tapers. No external sequencing or microcontroller intervention is required - this behavior is hardwired into the IC's internal error amplifier structure and is validated across temperature and line/load conditions in the datasheet.
LT1512CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1512CS8#TRPBF FAQ
1.How can I place an order for LT1512CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1512CS8#TRPBF 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 LT1512CS8#TRPBF reliable?
The price and inventory of LT1512CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1512CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1512CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1512CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1512CS8#TRPBF?
LT1512CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1512CS8#TRPBF 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 LT1512CS8#TRPBF?
For technical support, including LT1512CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1512CS8#TRPBF requirements.
6.How does Aetrix verify that LT1512CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1512CS8#TRPBF 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 LT1512CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1512CS8#TRPBF?
All LT1512CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1512CS8#TRPBF, 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 LT1512CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1512CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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