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Analog Devices Inc. LT1054IN8#PBF
- Part No.:
- LT1054IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1054IN8#PBF.pdf
- Description:
- IC REG CHARG PUMP ADJ/2.5V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,541
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Product details
Overview
LT1054IN8#PBF from Analog Devices is a monolithic bipolar switched-capacitor voltage converter and regulator in an 8-lead plastic DIP package, operating from 3.5V to 15V input, delivering up to 100mA output current with 1.1V typical voltage loss at 100mA, integrated 2.5V reference, and external shutdown capability. It serves as a regulated negative voltage inverter or doubler in low-noise analog power rails.
For engineers reviewing the LT1054IN8#PBF datasheet, LT1054IN8#PBF pinout, LT1054IN8#PBF application, or LT1054IN8#PBF equivalent, key selection considerations include its 25kHz internal oscillator, feedback-based regulation architecture, shutdown threshold of ≈0.45V, and compatibility with standard tantalum capacitor networks for ±12V bipolar supply generation.
Technical Context
The LT1054IN8#PBF implements a charge-pump topology with adaptive switch driver optimization across 10mA–100mA load range, achieving stable regulation via an internal error amplifier that controls PNP switch drive to maintain output voltage against line and load variations. Its reference voltage (2.5V nominal) features a positive temperature coefficient engineered to offset drift in the feedback network, yielding near-zero TC regulated outputs below 5V.
Pin-compatible with LTC1044/ICL7660 but adds regulation, external shutdown, and lower voltage loss - enabled by bipolar process design and oscillator synchronization capability on Pin 7. The N8 package supports industrial temperature range (–40°C to 100°C) with θJA = 130°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 15V - supports wide-input industrial and legacy 5V/12V systems without external LDO pre-regulation. |
| Output Current | 100mA - sufficient for dual op-amp biasing, sensor excitation, or low-power ADC/DAC analog supplies. |
| Voltage Loss | 1.1V at 100mA - defines minimum headroom between input and |VOUT|; enables –12V output from 15V rail with 1.9V margin. |
| Oscillator Frequency | 25kHz nominal - balances switching loss vs. capacitor size; adjustable via external cap on OSC pin (Pin 7). |
| Reference Voltage | 2.5V ±0.15V - precision internal reference enabling accurate resistor-divider-set regulated outputs (e.g., –5.00V ±20mV). |
| Shutdown Current | <100µA - achieved by grounding FB/SHDN (Pin 1); discharges CIN/COUT through load to prevent residual output voltage. |
| Line Regulation | 5mV (7V–12V) - ensures stable regulated output despite input rail fluctuations in battery-backed or unregulated DC systems. |
Pinout & Package
LT1054IN8#PBF uses the N8 (8-lead plastic DIP) package with 0.3-inch width, through-hole mounting, and θJA = 130°C/W. Pin 1 is FB/SHDN; Pin 3 is GND; Pin 5 is VOUT; Pin 8 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB/SHDN) | Inverting input of error amplifier / shutdown control | Pulling ≤0.45V disables switching and reference; externally tied to resistor divider for regulation or open-collector gate for sequencing. |
| Pin 2 (CAP+) | Positive terminal of input capacitor (CIN) | Switched between V+ and GND; carries ~2.2× IOUT peak current - requires low-ESR tantalum (e.g., 10µF). |
| Pin 3 (GND) | Circuit ground reference | Substrate connection point; VOUT (Pin 5) must never exceed this potential to avoid substrate diode conduction and startup failure. |
| Pin 4 (CAP–) | Negative terminal of input capacitor (CIN) | Switched between GND and VOUT; completes charge-transfer path during inversion/doubling cycles. |
| Pin 5 (VOUT) | Regulated output / substrate tie | Delivers inverted or doubled output; substrate connection mandates careful layout to prevent parasitic forward-biasing of internal junctions. |
| Pin 6 (VREF) | 2.5V precision reference output | Sources ≤60µA; used as divider tap for regulation; temperature-compensated to minimize output TC. |
| Pin 7 (OSC) | Oscillator timing node | Internally connected to 150pF timing cap; accepts external caps to adjust frequency or open-collector sync signal for EMI reduction. |
| Pin 8 (V+) | Positive supply input | Supplies energy to CIN; peak input current ≈2.2×IOUT - requires ≥2µF low-ESR bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables stable –5V, –12V, or custom negative outputs using only two external resistors - no external op-amp or reference required. |
| Adaptive switch driver | Optimizes efficiency across 10–100mA loads, maintaining <1.6V voltage loss over full industrial temperature range (–40°C to 100°C). |
| External shutdown | Reduces quiescent current to <100µA by grounding Pin 1 - supports low-power sleep modes in portable instrumentation. |
| Oscillator synchronization | Allows Pin 7 to accept external clock signals, eliminating beat frequencies in multi-rail systems and easing EMI compliance testing. |
| Pin compatibility | Direct replacement for LTC1044/ICL7660 in existing layouts - retains same footprint while adding regulation and lower loss. |
Applications
| Industrial Sensor Signal Conditioning | Portable Medical Instrumentation |
|---|---|
Use Scenario: Powering dual-supply op-amps in strain gauge bridge amplifiers requiring precise ±12V rails from a single 15V battery source. IC Role / Device Role / Timing Role: LT1054IN8#PBF acts as a regulated negative voltage inverter, generating –12V with <20mV line/load regulation to maintain ADC reference stability. Use Value: Eliminates need for isolated DC/DC converters; achieves 0.01% gain accuracy over temperature by minimizing reference drift coupling into bridge excitation. | Use Scenario: Providing isolated analog supply for ECG front-end amplifiers in battery-powered patient monitors where leakage current and noise must be minimized. IC Role / Device Role / Timing Role: LT1054IN8#PBF operates in shutdown mode between measurements, then delivers regulated –5V to low-noise instrumentation amps during acquisition windows. Use Value: Reduces average system power by >95% during idle periods while maintaining fast (<1ms) wake-up to full regulation - extends battery life beyond 72 hours. |
| Bipolar Supply Generation for Data Acquisition | Legacy System Voltage Translation |
Use Scenario: Generating matched ±12V rails for 16-bit SAR ADC drivers in industrial PLC I/O modules powered from 24VDC field bus. IC Role / Device Role / Timing Role: LT1054IN8#PBF configured as positive/negative doublers (two units) creates symmetrical outputs referenced to system ground with <0.5% mismatch. Use Value: Enables true bipolar input ranges (±10V) without transformer-based supplies - reduces PCB area by 40% and eliminates magnetic EMI sources. | Use Scenario: Retrofitting obsolete ±15V logic supplies in vintage test equipment originally designed for ICL7660, now requiring improved regulation and lower dropout. IC Role / Device Role / Timing Role: LT1054IN8#PBF replaces ICL7660 on identical PCB footprint, delivering –15V at 50mA with 1.35V voltage loss instead of 2.5V - restoring margin for aging capacitors. Use Value: Extends service life of legacy hardware without board re-spin; maintains compatibility with existing 0.1µF timing caps and 100µF output electrolytics. |
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 |
|---|---|---|---|
| LTC1044CS8#PBF | No internal regulation; fixed 100kHz oscillator; higher voltage loss (≈2.5V at 50mA); no shutdown pin. | Suitable only for unregulated inverter/doubler use; cannot implement feedback-based output stabilization. | Select only when regulation is unnecessary and higher switching frequency is acceptable for smaller capacitors. |
| MAX680CPA+ | CMOS process; 100kHz oscillator; no reference or error amp; 125mA output; no shutdown. | Lacks regulation and shutdown - limited to basic inverter topologies; higher ESR sensitivity due to CMOS switches. | Prefer for cost-sensitive, non-critical applications where ±5V unregulated output suffices and PCB space is constrained. |
Compared with LTC1044CS8#PBF and MAX680CPA+, the LT1054IN8#PBF provides unique regulation capability, lower voltage loss, and industrial temperature support - making it the only choice for precision analog rails requiring load/line stability without external components.
Availability
LT1054IN8#PBF is available at Aetrix Electronics and suitable for industrial sensor conditioning, portable medical instrumentation, bipolar data acquisition, legacy system retrofits, and precision analog supply generation requiring stable component supply across extended temperature operation.
Supply support for LT1054IN8#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 industrial, automotive, communications, and healthcare markets.
The LT1054 product line was designed specifically for high-efficiency, regulated switched-capacitor power conversion in space-constrained analog systems - emphasizing low voltage loss, integrated reference, and robust industrial temperature operation.
FAQ
What is the maximum output current capability of the LT1054IN8#PBF?
The LT1054IN8#PBF delivers up to 100mA continuous output current under specified conditions (CIN = COUT = 100µF tantalum, TJ ≤ 125°C). At 100mA, typical voltage loss is 1.1V across the 3.5V–15V input range. Derating is required above 85°C ambient due to thermal limits of the N8 package (θJA = 130°C/W).
How does the LT1054IN8#PBF achieve regulated output voltage?
The LT1054IN8#PBF achieves regulation using an internal 2.5V reference (Pin 6) and error amplifier (inverting input at Pin 1). An external resistor divider connects Pin 1 to VOUT, allowing precise setting of regulated outputs such as –5.00V (±20mV). The error amplifier controls PNP switch drive to maintain constant voltage despite input or load changes.
Can the LT1054IN8#PBF be synchronized to an external clock?
Yes - the LT1054IN8#PBF supports external oscillator synchronization via Pin 7 (OSC). An open-collector gate or NPN transistor can drive this pin at the desired system clock frequency, enabling EMI reduction and deterministic switching in multi-converter systems. A 20kΩ pull-up to VREF (Pin 6) is recommended for reliable edge triggering.
What is the shutdown mechanism of the LT1054IN8#PBF?
The LT1054IN8#PBF enters shutdown when Pin 1 (FB/SHDN) is pulled below ≈0.45V, turning off the reference, error amplifier, and internal oscillator. Quiescent current drops to <100µA, and internal switches discharge CIN/COUT through the load. Normal operation resumes when Pin 1 rises above the threshold - no restart pulse is needed unless COUT remains charged.
Why must Pin 5 (VOUT) never be pulled positive relative to Pin 3 (GND) in the LT1054IN8#PBF?
Pin 5 (VOUT) is tied to the silicon substrate. Pulling it positive relative to Pin 3 (GND) forward-biases the substrate-to-ground diode, preventing device startup and potentially causing latch-up. This occurs when driving op-amp loads referenced to V+, requiring an external transistor (e.g., 2N2222) in series with VOUT to block reverse current.
LT1054IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V (-Vin, 2Vin)
- Voltage - Output (Max):
- 30V
- Current - Output:
- 100mA
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1054IN8#PBF FAQ
1.How can I place an order for LT1054IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054IN8#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 LT1054IN8#PBF reliable?
The price and inventory of LT1054IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054IN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1054IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054IN8#PBF?
LT1054IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054IN8#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 LT1054IN8#PBF?
For technical support, including LT1054IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054IN8#PBF requirements.
6.How does Aetrix verify that LT1054IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1054IN8#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 LT1054IN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1054IN8#PBF?
All LT1054IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054IN8#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 LT1054IN8#PBF part is unused and in its original packaging.
Return procedure for LT1054IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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