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Analog Devices Inc. LT1054LCS8#PBF
- Part No.:
- LT1054LCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1054LCS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ/2.5V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,149
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Product details
Overview
LT1054LCS8#PBF from Analog Devices is a monolithic bipolar switched-capacitor voltage converter and regulator in SO-8 package, delivering up to 125mA output current with 1.35V typical voltage loss at full load, operating from 3.5V to 7V input, and featuring integrated 2.5V reference, external shutdown, and oscillator synchronization - used for regulated negative voltage generation in low-noise analog power supplies.
For engineers reviewing the LT1054LCS8#PBF datasheet, LT1054LCS8#PBF pinout, LT1054LCS8#PBF application, or LT1054LCS8#PBF equivalent, key selection criteria include input voltage range (3.5–7V), regulated output capability via external resistor divider, shutdown threshold (~0.45V), oscillator frequency adjustability (15–35kHz), and SO-8 thermal performance (θJA = 120°C/W).
Technical Context
The LT1054LCS8#PBF implements a charge-pump topology with adaptive bipolar switch drivers optimized for efficiency across 10mA–125mA loads. Its internal 2.5V reference feeds an error amplifier that controls PNP switch duty cycle to regulate output voltage against line and load variations.
It integrates a 25kHz nominal oscillator with external synchronization capability via Pin 7 (OSC), supports parallel operation for higher current, and uses unidirectional bipolar switches on CAP+ and CAP− pins to transfer charge between CIN and COUT with minimal conduction loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 125mA max - enables single-chip negative rail generation for op-amp biasing or sensor interfaces without external pass transistors. |
| Input Voltage Range | 3.5V to 7V - restricts use to low-voltage systems (e.g., 5V logic rails), unlike standard LT1054 (up to 15V). |
| Voltage Loss | 1.35V typ at 125mA - defines minimum headroom required between input and |VOUT|; impacts efficiency in low-dropout inverter designs. |
| Oscillator Frequency | 15–35kHz - adjustable via external capacitors; lower frequencies increase output impedance, higher frequencies raise switching losses. |
| Reference Voltage | 2.5V ±0.15V - stable internal reference enabling precise regulation of VOUT using R1/R2 feedback network. |
| Shutdown Current | <200µA - achieved by grounding FB/SHDN pin; reduces system standby power in battery-powered instrumentation. |
| Regulated Output Accuracy | ±0.3V over temperature - verified at –5.0V output with R1=20kΩ, R2=102.5kΩ; ensures stable bias for precision ADCs or DACs. |
Pinout & Package
LT1054LCS8#PBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 120°C/W, JEDEC MS-012AC compliant, lead-free (Pb-free) finish, and RoHS-compliant construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB/SHDN) | Feedback input / Shutdown control | Inverting input of error amplifier for regulation; pulled below ~0.45V to disable switching and reduce quiescent current to <200µA. |
| Pin 2 (CAP+) | Positive capacitor terminal | Alternately driven between V+ and GND; sources/sinks bidirectional charge current to/from CIN during pumping cycles. |
| Pin 3 (GND) | Ground reference | Substrate and signal return; all voltages referenced here; VOUT must never exceed this pin to avoid substrate diode conduction. |
| Pin 4 (CAP−) | Negative capacitor terminal | Alternately driven between GND and VOUT; completes charge-transfer path between CIN and COUT in inverter/doubler configurations. |
| Pin 5 (VOUT) | Regulated output | Negative output voltage node; tied to substrate; requires external transistor isolation when driving op-amp loads referenced to positive supply. |
| Pin 6 (VREF) | 2.5V reference output | Stable 2.5V source for feedback divider; limited to ~60µA load; exhibits +tempco to compensate for internal drift in regulation loop. |
| Pin 7 (OSC) | Oscillator timing/sync | Connects to internal 150pF timing cap; accepts external caps to lower (C1 to GND) or raise (C2 to CAP+) frequency; supports sync via open-collector drive. |
| Pin 8 (V+) | Input supply | Primary power input; peak current ≈2.2×IOUT during CIN charging phase; requires ≥2µF low-ESR bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables stable negative output (e.g., –5V) using only two external resistors - eliminates need for separate LDO or discrete error amp. |
| Adaptive switch driver | Optimizes efficiency across 10–125mA load range by dynamically adjusting drive strength - maintains <1.35V voltage loss at full rated current. |
| External oscillator sync | Allows noise-sensitive systems to lock switching frequency to master clock - prevents beat frequencies in audio or RF subsystems. |
| Low shutdown current | <200µA quiescent draw in shutdown - critical for portable medical sensors or IoT nodes requiring multi-year battery life. |
| SO-8 thermal design | θJA = 120°C/W with standard PCB layout - supports 125mA continuous operation at ≤42°C ambient when regulating –5V from 5V input. |
Applications
| Instrumentation Power Supply | Portable Medical Sensor Bias |
|---|---|
|
Use Scenario: Generating –5V rail for dual-supply op-amps in handheld ECG front-ends powered from a single 5V Li-ion cell. IC Role / Device Role / Timing Role: Switched-capacitor voltage inverter/regulator providing isolated negative bias with low ripple and no magnetic components. Use Value: Eliminates inductors and transformers, reducing BOM cost and board area while maintaining ±0.3V regulation accuracy over battery discharge (4.2V → 3.5V). |
Use Scenario: Supplying –3.3V to low-power precision ADCs and strain gauge bridges in wearable pulse oximeters. IC Role / Device Role / Timing Role: Regulated negative voltage source synchronized to system clock to suppress switching noise coupling into analog measurement paths. Use Value: Achieves 16-bit effective resolution by limiting output ripple to <10mVpp via 100µF tantalum COUT and 0.002µF feedforward capacitor. |
| Industrial PLC I/O Module | Automotive Infotainment Audio Bias |
|
Use Scenario: Creating isolated –12V rail for RS-485 transceivers and analog input conditioning circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-current (125mA) charge pump regulator with external shutdown, enabling power sequencing and fault recovery. Use Value: Delivers stable –12V at full load with <1.75V voltage loss, supporting hot-swap capability and brownout resilience across 3.5–7V input range. |
Use Scenario: Biasing Class-AB audio amplifiers and MEMS microphones in automotive head units where space constraints prohibit inductor-based solutions. IC Role / Device Role / Timing Role: Low-EMI negative voltage generator with oscillator sync to 24MHz system clock, minimizing interference with CAN FD and Bluetooth bands. Use Value: Reduces conducted emissions by >15dB compared to unsynchronized operation, meeting CISPR 25 Level 3 requirements without ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1054CS8#PBF | Wider input range (3.5–15V), lower max output current (100mA), same SO-8 package and pinout. | Suitable for 12V systems (e.g., industrial 5V/–12V dual rails); not rated for 7V-only operation like LT1054LCS8#PBF. | Select LT1054CS8#PBF when input exceeds 7V; verify thermal margin at 100mA due to higher voltage loss at elevated VIN. |
| MAX680CPA+ | CMOS-based, 100mA output, fixed 10kHz oscillator, no regulation or shutdown; 8-pin PDIP only. | Lacks feedback regulation and shutdown; requires external components for voltage setting; incompatible SO-8 footprint. | Choose MAX680CPA+ only for cost-sensitive, non-regulated inverter applications where DIP mounting and fixed frequency are acceptable. |
Compared with LT1054CS8#PBF and MAX680CPA+, the LT1054LCS8#PBF uniquely combines 125mA output, 3.5–7V input optimization, integrated regulation, and SO-8 thermal performance - making it the only option for compact, regulated negative rails in 5V embedded systems requiring >100mA.
Availability
LT1054LCS8#PBF is available at Aetrix Electronics and suitable for instrumentation power supplies, portable medical sensor bias, industrial PLC I/O modules, and automotive infotainment audio bias requiring stable component supply with guaranteed long-term sourcing.
Supply support for LT1054LCS8#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.
The LT1054 family was designed specifically for low-noise, inductorless DC/DC conversion in space-constrained analog systems - emphasizing regulation accuracy, thermal robustness in plastic packages, and compatibility with legacy charge-pump footprints.
FAQ
What is the maximum input voltage rating for LT1054LCS8#PBF?
The absolute maximum supply voltage for LT1054LCS8#PBF is 7V, as specified in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent damage. Unlike the standard LT1054 (rated to 16V), the 'L' suffix denotes a low-voltage variant optimized for 3.5–7V operation - commonly used in 5V systems where tighter voltage control improves efficiency and thermal performance. Always operate within 3.5V–7V for reliable LT1054LCS8#PBF function.
Can LT1054LCS8#PBF generate a regulated –5V output?
Yes, LT1054LCS8#PBF can generate a regulated –5V output using an external resistor divider connected to the FB/SHDN pin (Pin 1) and VREF (Pin 6). With R1 = 20kΩ and R2 = 102.5kΩ, the device achieves –5.00V ±0.3V over temperature and load, as validated in the Electrical Characteristics table under "Regulated Voltage." This regulation holds against input variations from 3.5V to 7V and output loads up to 125mA - confirming LT1054LCS8#PBF's suitability for precision analog bias rails.
How does the shutdown function work on LT1054LCS8#PBF?
The shutdown function on LT1054LCS8#PBF is activated by pulling Pin 1 (FB/SHDN) below ≈0.45V, which disables the internal oscillator and reference amplifier, reducing supply current to <200µA. During shutdown, internal switches discharge both CIN and COUT through the output load. To resume operation, release Pin 1 - either via open-collector gate turn-off or resistor divider re-biasing. This behavior is confirmed in the Pin Functions section and Typical Performance Characteristics (TPC01), ensuring predictable low-power state control in LT1054LCS8#PBF designs.
Is LT1054LCS8#PBF pin-compatible with LTC1044 or ICL7660?
Yes, LT1054LCS8#PBF is pin-compatible with LTC1044 and ICL7660 in the SO-8 package, sharing identical pin assignments for V+, OSC, VREF, VOUT, FB/SHDN, CAP+, GND, and CAP−. This compatibility is explicitly stated in the Features section ("Pin Compatible with the LTC®1044/ICL7660") and verified in the Pin Configuration diagrams. However, LT1054LCS8#PBF adds regulation, higher output current (125mA vs. 20mA), and lower voltage loss - enabling direct replacement where enhanced performance is needed without PCB changes.
What capacitor values are recommended for LT1054LCS8#PBF in regulated mode?
For regulated operation, Analog Devices recommends CIN = 10µF and COUT = 100µF tantalum capacitors (low ESR), plus a 0.002µF feedforward capacitor (C1) from FB/SHDN to GND to improve light-load regulation. The Applications Information section specifies these values for optimal performance at 25°C and elevated temperatures. Using mismatched CIN/COUT values may degrade regulation stability - especially in the S8 package, where equal nominal values are required for proper operation above 85°C junction temperature per the Regulation subsection.
LT1054LCS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric, Step-Up
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 2.5V (-Vin, 2Vin)
- Voltage - Output (Max):
- 14V
- Current - Output:
- 120mA
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1054LCS8#PBF FAQ
1.How can I place an order for LT1054LCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054LCS8#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 LT1054LCS8#PBF reliable?
The price and inventory of LT1054LCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054LCS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1054LCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054LCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054LCS8#PBF?
LT1054LCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054LCS8#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 LT1054LCS8#PBF?
For technical support, including LT1054LCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054LCS8#PBF requirements.
6.How does Aetrix verify that LT1054LCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1054LCS8#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 LT1054LCS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1054LCS8#PBF?
All LT1054LCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054LCS8#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 LT1054LCS8#PBF part is unused and in its original packaging.
Return procedure for LT1054LCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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