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Analog Devices Inc. LTC1046IS8#PBF
- Part No.:
- LTC1046IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1046IS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP INV 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:486
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Product details
Overview
LTC1046IS8#PBF from Analog Devices is a monolithic CMOS switched-capacitor voltage converter optimized for 5V-to–5V inversion with 50mA output current, 27Ω max output resistance, and 97% open-circuit voltage conversion efficiency. It serves as a high-current plug-in replacement for ICL7660/LTC1044 in space-constrained industrial and portable power rails requiring stable bipolar supplies without inductors.
For engineers reviewing the LTC1046IS8#PBF datasheet, LTC1046IS8#PBF pinout, LTC1046IS8#PBF application, or LTC1046IS8#PBF equivalent, key selection criteria include its –40°C to 85°C operating range, BOOST pin-enabled frequency scaling, LV pin logic-level control, and compatibility with 1.5V–6V input voltages in low-noise analog front-ends and battery-powered instrumentation.
Technical Context
The LTC1046IS8#PBF implements a four-phase switched-capacitor topology with internal CMOS switches and Schmitt-trigger oscillator, enabling voltage inversion (VOUT = –VIN), division (VOUT = VIN/2), or multiplication (±nVIN). Its BOOST pin increases switching frequency up to 3×, directly reducing output impedance and ripple under load.
Operation relies on external flying capacitors (C1/C2) and optional OSC capacitor (COSC); output resistance is dominated by 1/(f·C1) at low frequencies and MOS switch RON at high frequencies. LV pin ties internal logic ground when V+ ≥ 3V, eliminating need for external bias in standard 5V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA continuous - supports rail-splitting and dual-supply op-amp biasing without thermal derating at 5V input. |
| Output Resistance | 27Ω max at 5V/30kHz - defines load regulation slope (ΔVOUT/ΔIOUT = –27mV/mA) for precision analog circuits. |
| No-Load Supply Current | 300µA max at 5V - enables ultra-low-quiescent operation in always-on sensor nodes and standby power domains. |
| Supply Voltage Range | 1.5V to 6V - allows direct use with single-cell LiFePO₄ (2.5–3.6V), alkaline (1.5–4.5V), or regulated 3.3V/5V rails. |
| Oscillator Frequency | 20–30kHz (internal), scalable via BOOST pin or external COSC - higher fOSC reduces output impedance but increases switching losses. |
| Voltage Conversion Efficiency | 97% min open-circuit, 95% min power efficiency - minimizes heat generation and extends battery life in portable medical devices. |
| Operating Temperature | –40°C to +85°C - qualified for automotive cabin electronics, industrial PLC I/O modules, and outdoor IoT gateways. |
Pinout & Package
Package: 8-Lead Plastic Small Outline (SO-8), narrow body (0.150"), RoHS-compliant lead-free finish. Thermal resistance θJA = 150°C/W; maximum junction temperature 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency boost control | Connecting to V+ triples internal oscillator frequency, lowering output impedance for higher load currents. |
| 2 (OSC) | Internal oscillator node / external clock input | Accepts external TTL/CMOS clock or sets frequency via external capacitor (COSC); sink/source current ≤45µA. |
| 3 (LV) | Logic supply reference | Internally shorted to GND when V+ ≥ 3V; must be externally grounded for V+ < 3V to ensure proper logic level translation. |
| 4 (VOUT) | Inverted output terminal | Delivers –VIN (e.g., –5V from 5V input); output impedance dominates load regulation and ripple performance. |
| 5 (CAP+) | Flying capacitor positive terminal | Connects to one side of flying capacitor C1; carries bidirectional charge-transfer current during switching cycles. |
| 6 (GND) | Power and signal ground reference | Common return path for all internal logic, switches, and external capacitors; requires low-impedance PCB plane. |
| 7 (CAP–) | Flying capacitor negative terminal | Connects to other side of flying capacitor C1; forms charge-pump loop with CAP+ and internal switches. |
| 8 (V+) | Positive input supply | Accepts 1.5V–6V input; powers internal logic and drives charge-transfer switches; absolute max 6.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin compatibility with ICL7660/LTC1044 | Enables drop-in upgrade to 2.5× higher output current without PCB redesign or layout changes. |
| Three configurable voltage functions | Supports inversion (–VIN), division (VIN/2), and multiplication (±nVIN) using same IC and external component set. |
| BOOST pin for frequency scaling | Allows dynamic adjustment of output impedance and ripple trade-off without changing external components. |
| Low 300µA no-load supply current | Reduces standby power consumption in battery-backed real-time clocks and memory retention circuits. |
| Wide 1.5V–6V input range | Eliminates need for pre-regulation in multi-cell or variable-voltage battery systems. |
Applications
| Battery-Powered Instrumentation | Rail-Splitting for Op-Amp Biasing |
|---|---|
Use Scenario: Portable multimeter or handheld oscilloscope requiring ±5V analog front-end supplies from a single 9V alkaline battery. IC Role / Device Role / Timing Role: Voltage inverter generating stable –5V rail referenced to common ground, enabling true bipolar signal acquisition. Use Value: Eliminates bulky inductors and reduces BOM cost by 40% versus inductive DC/DC solutions while maintaining <1% load regulation. | Use Scenario: Audio line driver IC needing symmetrical ±2.5V supplies from a 5V system rail. IC Role / Device Role / Timing Role: Precision voltage divider (VOUT = VIN/2) creating virtual ground at exactly half-input voltage for op-amp biasing. Use Value: Achieves 0.002% accuracy with <100nA load current, supporting 24-bit ADC reference stability in professional audio interfaces. |
| Negative Supply for RS-232 Transceivers | Low-Power Sensor Signal Conditioning |
Use Scenario: Industrial PLC module powering MAX232-compatible transceivers from a 3.3V microcontroller rail. IC Role / Device Role / Timing Role: Inverting converter delivering –3.3V at 20mA to meet RS-232 driver voltage requirements. Use Value: Operates down to 1.5V input, enabling direct use with partially discharged Li-ion cells and extending field-deployed device runtime. | Use Scenario: Wireless environmental sensor node using low-noise instrumentation amplifiers with dual-supply configuration. IC Role / Device Role / Timing Role: Low-quiescent inverter providing –2.5V bias for amplifier input stage while drawing only 300µA in sleep mode. Use Value: Extends coin-cell battery life beyond 5 years by minimizing idle current without sacrificing signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1044A | Lower 20mA output current, 55Ω max ROUT, wider 1.5V–12V input range | Suitable for lower-current, higher-voltage applications where size and efficiency are secondary to input flexibility | Select LTC1044A only when >6V input capability is required and 50mA output is unnecessary |
| LT1054 | 100mA output, integrated regulator, SO-8 package, higher 1.5mA quiescent current | Preferred for regulated –5V outputs where tight voltage tolerance (<±1%) is critical despite higher idle power | Choose LT1054 when output regulation stability outweighs quiescent current concerns in mains-powered equipment |
Compared with LTC1044A and LT1054, the LTC1046IS8#PBF delivers optimal balance of high output current (50mA), ultra-low quiescent current (300µA), and wide temperature range (–40°C to 85°C) for battery-constrained industrial sensing and portable test equipment.
Availability
LTC1046IS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, rail-splitting for op-amp biasing, negative supply generation for RS-232 transceivers, and low-power sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for LTC1046IS8#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 with precision power and signal chain solutions.
The LTC1046 belongs to Analog Devices' legacy switched-capacitor voltage converter product line, designed specifically for inductorless DC/DC conversion in space- and cost-sensitive applications where reliability across extended temperature ranges is essential.
FAQ
What is the maximum output current specification for the LTC1046IS8#PBF?
The LTC1046IS8#PBF is rated for 50mA continuous output current at V+ = 5V and TA = 25°C. This value is guaranteed over the full –40°C to +85°C operating temperature range per the datasheet's electrical characteristics table. Output current capability decreases slightly at lower input voltages (e.g., 10mA at V+ = 2V) due to internal switch limitations and efficiency roll-off.
Can the LTC1046IS8#PBF generate +5V from a 5V input?
No, the LTC1046IS8#PBF cannot generate +5V from a 5V input. Its core functions are inversion (VOUT = –VIN), division (VOUT = VIN/2), and multiplication (±nVIN). To produce +5V from 5V, a boost converter or LDO would be required. The LTC1046IS8#PBF's architecture is inherently charge-pump-based and lacks a step-up topology capable of generating voltages exceeding the input rail.
How does the BOOST pin affect the performance of the LTC1046IS8#PBF?
The BOOST pin on the LTC1046IS8#PBF increases internal oscillator frequency by approximately 3× when tied to V+, reducing output impedance (e.g., from ~60Ω to ~27Ω at 5V) and improving load regulation and ripple rejection. This enhancement comes at the cost of marginally higher supply current and switching losses, making it ideal for higher-current loads where dynamic response matters more than absolute efficiency.
Is the LTC1046IS8#PBF pin-compatible with the LTC1044?
Yes, the LTC1046IS8#PBF is explicitly designed as a pin-for-pin and functionally compatible upgrade to the LTC1044 in SO-8 packages. Both share identical pinout, footprint, and basic functionality, allowing direct substitution. However, the LTC1046IS8#PBF delivers 2.5× higher output current (50mA vs. 20mA) and lower output resistance (27Ω vs. 55Ω), making it a drop-in performance upgrade without layout changes.
What is the recommended flying capacitor value for the LTC1046IS8#PBF in a 5V-to–5V inverter application?
Analog Devices specifies 10µF tantalum or low-ESR ceramic capacitors for C1 and C2 in standard 5V-to–5V inverter configurations with the LTC1046IS8#PBF. These values optimize output impedance (27Ω), ripple (<50mVpp), and efficiency (95%+) at 50mA load. Using smaller values (e.g., 1µF) increases output impedance and ripple; larger values (>22µF) yield diminishing returns and increase board area and cost without proportional benefit.
LTC1046IS8#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
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 5.5kHz ~ 30kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1046IS8#PBF FAQ
1.How can I place an order for LTC1046IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1046IS8#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 LTC1046IS8#PBF reliable?
The price and inventory of LTC1046IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1046IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1046IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1046IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1046IS8#PBF?
LTC1046IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1046IS8#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 LTC1046IS8#PBF?
For technical support, including LTC1046IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1046IS8#PBF requirements.
6.How does Aetrix verify that LTC1046IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1046IS8#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 LTC1046IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1046IS8#PBF?
All LTC1046IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1046IS8#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 LTC1046IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1046IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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