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Analog Devices Inc. LT1054CN8#PBF
- Part No.:
- LT1054CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1054CN8#PBF.pdf
- Description:
- IC REG CHARG PUMP ADJ/2.5V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:599
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Product details
Overview
LT1054CN8#PBF from Analog Devices is a monolithic bipolar switched-capacitor voltage converter and regulator in an 8-lead plastic DIP package. It delivers up to 100mA output current with 1.1V typical voltage loss at 100mA, operates from 3.5V to 15V input, features internal 25kHz oscillator, and supports regulated negative voltage generation via external resistor divider. It is used in dual-rail power supplies for op-amp circuits requiring clean, isolated negative bias.
For engineers reviewing the LT1054CN8#PBF datasheet, LT1054CN8#PBF pinout, LT1054CN8#PBF application, or LT1054CN8#PBF equivalent, key selection criteria include its regulated inverter capability, shutdown control via FB/SHDN pin, low-loss switching architecture, compatibility with LTC1044/ICL7660 layouts, and thermal performance in N8 package at 0°C to 100°C.
Technical Context
The LT1054CN8#PBF implements a charge-pump topology with adaptive switch driver optimization across 10mA–100mA load range, achieving stable regulation via internal 2.5V reference and error amplifier. Its oscillator runs nominally at 25kHz (15–40kHz over full supply range), and frequency can be adjusted or synchronized externally via OSC pin.
Regulation is achieved by feeding back VOUT through an external R1/R2 divider to the FB/SHDN pin, enabling precise negative output setting (e.g., –5.00V ±0.3V) with line regulation ≤25mV and load regulation ≤50mV. Shutdown is activated by pulling FB/SHDN below ≈0.45V, reducing quiescent current to <200µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA max - sufficient for powering dual op-amp rails or analog front-ends without external pass devices |
| Voltage Loss | 1.1V typ @ 100mA - defines minimum input headroom needed for target output (e.g., 7V input required for –5V output) |
| Input Range | 3.5V to 15V - supports wide industrial and legacy logic-supply inputs including 5V, 9V, and 12V systems |
| Oscillator Freq | 25kHz nominal (15–40kHz) - balances switching loss vs. capacitor size; adjustable via OSC pin capacitance |
| Reference Voltage | 2.50V ±0.15V - precision internal reference enables accurate feedback-based regulation |
| Shutdown Current | <200µA - enables low-power sleep modes in battery-backed or intermittent-use systems |
| Package | N8 (8-lead plastic DIP) - through-hole compatible, θJA = 130°C/W, rated for 0°C to 100°C operation |
Pinout & Package
N8 package: 8-lead plastic DIP, through-hole mounting, JEDEC MS-001 standard, 0°C to 100°C operating junction temperature, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: FB/SHDN | Feedback input / shutdown control | Inverting input of error amplifier; pull ≤0.45V to disable switching and reduce supply current to <200µA |
| Pin 2: CAP+ | Positive side of flying capacitor | Switched between VIN and GND; carries bidirectional charge-transfer current (~2.2× IOUT peak) |
| Pin 3: GND | Ground reference | Substrate tie point; all voltages referenced here; VOUT must not exceed GND during startup |
| Pin 4: CAP– | Negative side of flying capacitor | Switched between GND and VOUT; completes charge transfer path to output capacitor |
| Pin 5: VOUT | Regulated negative output | Also tied to substrate; requires external transistor if 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 to maintain accuracy |
| Pin 7: OSC | Oscillator timing node | Internal 150pF capacitor node; add C1 to ground to lower freq, or C2 from CAP+ to raise freq |
| Pin 8: V+ | Input supply | Main power input; bypass with ≥2µF low-ESR tantalum to handle 2.2× IOUT peak currents |
Key Features
| Feature | Design Value |
|---|---|
| Integrated regulation | Enables stable negative output (e.g., –5.00V) without external LDO, using only two resistors and VREF |
| Adaptive switch drive | Optimizes conduction efficiency across 10–100mA load range, minimizing voltage loss variation |
| External shutdown | FB/SHDN pin doubles as precision enable/disable control, supporting µA-level system sleep states |
| OSC synchronization | Allows alignment of switching edges to external clocks-critical for EMI reduction in mixed-signal systems |
| Pin compatibility | Direct replacement for LTC1044/ICL7660 in existing designs, preserving layout and BOM continuity |
Applications
| Op-Amp Dual-Rail Supply | Low-Power Sensor Bias |
|---|---|
Use Scenario: Generating ±5V or ±12V rails from single 5V or 12V supply for rail-to-rail op-amps in data acquisition systems. IC Role / Device Role / Timing Role: Voltage inverter/regulator providing isolated negative output with tight regulation against load and line variation. Use Value: Eliminates need for separate negative linear regulator; achieves <1.1V loss at 100mA, improving overall system efficiency and thermal margin. | Use Scenario: Powering strain gauge bridges or low-noise instrumentation amplifiers requiring stable, low-current negative bias. IC Role / Device Role / Timing Role: Precision negative voltage source with 2.5V internal reference and <50mV load regulation. Use Value: Enables sub-mV-level offset stability in bridge circuits; shutdown mode reduces idle current to <200µA for battery longevity. |
| Portable Medical Instrumentation | Legacy TTL/CMOS Level Shifting |
Use Scenario: Providing isolated –5V for analog front-end ICs in handheld ECG or pulse oximeter units powered by single Li-ion cell (3.3–4.2V). IC Role / Device Role / Timing Role: Regulated inverter operating down to 3.5V input, with shutdown controlled by microcontroller GPIO. Use Value: Maintains regulated –5V output across battery discharge curve; shutdown cuts supply current to <200µA during standby. | Use Scenario: Converting 0/+5V TTL logic outputs to ±5V levels for driving older analog multiplexers or DACs. IC Role / Device Role / Timing Role: Unregulated voltage inverter delivering –5V with minimal external components (2 caps only). Use Value: Achieves fast, low-cost level translation without transformer or inductor; 25kHz switching avoids audible noise in sensitive audio paths. |
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 inverter only; 20kHz oscillator; lower max output current (20mA) | Cannot generate regulated outputs; unsuitable where load/line regulation <50mV required | Select when only basic unregulated inversion is needed and board space favors SO-8 |
| ICL7660CPA | No regulation; no shutdown; 10kHz oscillator; higher voltage loss (>2V @ 20mA); no VREF pin | Not suitable for precision analog bias; lacks control features for power management | Select only for cost-sensitive, non-critical digital logic inversion with ample input headroom |
Compared with LTC1044CS8#PBF and ICL7660CPA, the LT1054CN8#PBF uniquely combines regulation, shutdown, and 100mA output in a drop-in-compatible DIP package-enabling design reuse while upgrading performance in legacy systems.
Availability
LT1054CN8#PBF is available at Aetrix Electronics and suitable for op-amp dual-rail supplies, portable medical instrumentation, and low-power sensor biasing requiring stable component supply and long-term manufacturability.
Supply support for LT1054CN8#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 belongs to Analog Devices' legacy Linear Technology switched-capacitor converter family, designed specifically for high-efficiency, low-noise, regulated DC-DC conversion in space-constrained analog systems without inductors.
FAQ
What is the maximum output current specification for the LT1054CN8#PBF?
The LT1054CN8#PBF is rated for 100mA maximum continuous output current under specified conditions (CIN = COUT = 100µF tantalum, TJ ≤ 100°C). At this load, typical voltage loss is 1.1V, and output resistance is 10–15Ω. Exceeding 100mA may cause thermal shutdown or regulation degradation. Derating is required above 25°C ambient per θJA = 130°C/W.
How does the LT1054CN8#PBF achieve regulated negative voltage output?
The LT1054CN8#PBF achieves regulation by using its internal 2.5V reference (Pin 6) and error amplifier (FB/SHDN Pin 1) with an external resistor divider (R1/R2) across VOUT and GND. The amplifier compares divided VOUT to VREF and adjusts switch duty to maintain setpoint-e.g., –5.00V with R1 = 20kΩ, R2 = 102.5kΩ. Regulation holds against both input voltage changes (≤25mV line regulation) and load shifts (≤50mV load regulation).
Can the LT1054CN8#PBF be synchronized to an external clock?
Yes, the LT1054CN8#PBF supports external synchronization via its OSC pin (Pin 7). A pull-up resistor (20kΩ recommended) to VREF and an open-collector gate or NPN transistor driven by the external clock can force oscillator edge alignment. This reduces beat frequencies and EMI in systems with multiple switching converters-critical in precision data acquisition where noise coupling must be minimized.
What is the purpose of the VOUT pin connection to the substrate in the LT1054CN8#PBF?
The VOUT pin (Pin 5) is internally tied to the LT1054CN8#PBF's substrate, making it the device's substrate reference. Pulling VOUT positive relative to GND (Pin 3) forward-biases the substrate diode and prevents startup. This occurs when driving op-amp loads referenced to their positive supply. To avoid failure, an external NPN transistor (e.g., 2N2222) must isolate VOUT from such loads-as shown in Figure 1 of the datasheet-ensuring reliable turn-on behavior.
Is the LT1054CN8#PBF pin-compatible with the LTC1044 or ICL7660?
Yes, the LT1054CN8#PBF is explicitly pin-compatible with the LTC1044 and ICL7660 in the 8-lead DIP package. Pin assignments (V+, OSC, VREF, VOUT, FB/SHDN, CAP+, GND, CAP–) match identically. This allows direct replacement in legacy designs-retaining PCB layout-while adding regulation, shutdown, higher output current (100mA vs. 20mA), and lower voltage loss (1.1V vs. >2V).
LT1054CN8#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:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1054CN8#PBF FAQ
1.How can I place an order for LT1054CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1054CN8#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 LT1054CN8#PBF reliable?
The price and inventory of LT1054CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1054CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1054CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1054CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1054CN8#PBF?
LT1054CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1054CN8#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 LT1054CN8#PBF?
For technical support, including LT1054CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1054CN8#PBF requirements.
6.How does Aetrix verify that LT1054CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1054CN8#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 LT1054CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1054CN8#PBF?
All LT1054CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1054CN8#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 LT1054CN8#PBF part is unused and in its original packaging.
Return procedure for LT1054CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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