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Analog Devices Inc. LTC1046CS8#PBF
- Part No.:
- LTC1046CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1046CS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP INV 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:282
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Product details
Overview
LTC1046CS8#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 plug-in replacement for ICL7660/LTC1044 in low-voltage power rail generation for portable instrumentation and sensor signal conditioning circuits.
For engineers reviewing the LTC1046CS8#PBF datasheet, LTC1046CS8#PBF pinout, LTC1046CS8#PBF application, or LTC1046CS8#PBF equivalent, key selection criteria include output drive capability at ≤6V supply, BOOST pin frequency scaling, LV pin logic reference behavior, and SO-8 thermal performance (θJA = 150°C).
Technical Context
The LTC1046CS8#PBF implements a four-phase switched-capacitor topology with internal MOSFET switches controlled by an on-chip oscillator whose frequency is adjustable via BOOST (Pin 1) and external capacitor on OSC (Pin 7). Its LV (Pin 6) terminal defines the logic ground reference for internal CMOS gates, automatically shorted to GND when V+ ≥ 3V.
Output voltage polarity and gain are determined by external capacitor routing: inversion (VOUT = –VIN), division (VOUT = VIN/2), or multiplication (VOUT = ±nVIN). The device trades maximum input voltage headroom (6V absolute max) for higher output current versus legacy ICL7660/LTC1044, achieving 2.5× drive capability at 5V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA continuous - supports rail-splitting and dual-supply generation for op-amps and ADCs without external boost stages |
| Output Resistance | 27Ω max at 5V/30kHz - sets load regulation slope (ΔVOUT/ΔIL = –27mV/mA) and ripple under dynamic loads |
| No-Load Supply Current | 300µA max at 5V - enables battery-powered operation with >1-year standby life in low-duty-cycle systems |
| Oscillator Frequency | 20–30kHz (COSC = 0pF), scalable to ~90kHz with BOOST pin - higher fOSC reduces 1/fC output impedance term |
| Voltage Conversion Efficiency | 97% min open-circuit, 95% min power efficiency - minimizes heat rise in SO-8 package at full load |
| Supply Voltage Range | 1.5V to 6V - compatible with single-cell Li-ion, 3.3V logic rails, and legacy 5V systems |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded control and industrial HMI applications |
Pinout & Package
Package: 8-Lead Plastic Small Outline (SO-8, Narrow 0.150", JEDEC MS-012), RoHS-compliant lead-free finish, θJA = 150°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency multiplier input | Connecting to V+ triples switching frequency (~90kHz), reducing output impedance and ripple for high-current loads |
| 2 (V+) | Positive supply input | Accepts 1.5V–6V; powers internal logic and switch drivers; absolute max 6.5V |
| 3 (LV) | Logic reference ground | Internally shorted to GND when V+ ≥ 3V; must be externally tied to GND if V+ < 3V |
| 4 (VOUT) | Inverted/divided output | Delivers –VIN, VIN/2, or ±nVIN depending on external capacitor configuration; 27Ω source impedance |
| 5 (CAP+) | Charge pump flying capacitor positive node | Connects to one terminal of flying capacitor (C1); alternately charged/discharged during switching cycles |
| 6 (GND) | Power and signal ground | Common return for V+, CAP–, and load; requires low-impedance PCB plane for ripple suppression |
| 7 (CAP–) | Charge pump flying capacitor negative node | Connects to second terminal of flying capacitor (C1); referenced to GND or VOUT depending on topology |
| 8 (OSC) | Internal oscillator node | External capacitor (COSC) sets base frequency; can be driven by external clock for synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Plug-in compatibility with ICL7660/LTC1044 | Same SO-8 pinout and functional modes enable drop-in upgrade without PCB revision |
| BOOST pin frequency scaling | Enables dynamic optimization of output impedance vs. EMI trade-off across load conditions |
| LV pin auto-grounding | Eliminates external bias components for V+ ≥ 3V systems, reducing BOM count and layout complexity |
| Low no-load quiescent current | 300µA max enables use in always-on monitoring nodes without compromising battery life |
| Wide 1.5V–6V input range | Supports direct connection to single Li-ion cells (3.0–4.2V), 3.3V logic rails, and legacy 5V supplies |
Applications
| Portable Instrumentation Power | Sensor Signal Conditioning |
|---|---|
Use Scenario: Generating ±5V rails from a single 5V USB supply in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Voltage inverter providing isolated negative rail for op-amp biasing and ADC reference circuitry. Use Value: Eliminates need for inductive DC/DC converters, reducing EMI, board area, and cost while maintaining 50mA drive for analog front-end stages. | Use Scenario: Biasing precision instrumentation amplifiers requiring symmetrical ±2.5V supplies from a 5V microcontroller rail. IC Role / Device Role / Timing Role: Supply splitter generating VOUT = ±VS/2 with ultralow drift due to matched internal switch characteristics. Use Value: Achieves 0.002% divider accuracy at <100nA load, enabling 16-bit+ measurement resolution without external trimming. |
| Rail-Splitting for Op-Amps | Low-Power Sensor Node Supply |
Use Scenario: Creating bipolar supply for rail-to-rail op-amps in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Inverting converter delivering –5V from 5V input, with BOOST pin configured for 30kHz operation to minimize output impedance. Use Value: 27Ω output resistance ensures <135mV droop at 5mA load, preserving op-amp common-mode range and PSRR. | Use Scenario: Powering low-noise MEMS accelerometers and temperature sensors from coin-cell batteries. IC Role / Device Role / Timing Role: Efficient voltage inverter operating at 1.5V–3.6V input, leveraging LV pin auto-grounding to simplify design. Use Value: 300µA no-load current extends CR2032 battery life beyond 2 years in sleep-mode dominant applications. |
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 | 20mA output current, 55Ω output resistance, same SO-8 pinout | Lower drive capability limits use to <10mA loads; less suitable for rail-splitting with active analog circuitry | Select when lower cost and reduced power dissipation outweigh current requirements |
| LT1054CS8#PBF | 100mA output, integrated regulator, higher quiescent current (1.5mA) | Regulated output improves line/load regulation but increases complexity and thermal load in SO-8 | Select when stable ±5V output under varying load is critical and board space allows larger capacitors |
Compared with LTC1044CS8#PBF, the LTC1046CS8#PBF delivers 2.5× output current with identical footprint; versus LT1054CS8#PBF, it offers lower quiescent current and simpler external component count at the expense of regulation.
Availability
LTC1046CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, sensor signal conditioning, rail-splitting for op-amps, and low-power sensor node supply requiring stable component supply across commercial temperature grades.
Supply support for LTC1046CS8#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1046CS8#PBF belongs to Analog Devices' precision switched-capacitor converter product line, designed specifically for inductorless DC/DC conversion in space-constrained, low-EMI applications where magnetic components are undesirable.
FAQ
What is the maximum output current capability of the LTC1046CS8#PBF?
The LTC1046CS8#PBF delivers up to 50mA continuous output current when configured for voltage inversion at V+ = 5V and fOSC = 30kHz. This rating assumes proper external capacitor selection (e.g., 10µF low-ESR tantalum), adequate PCB thermal relief, and operation within the 0°C to 70°C ambient range. Output current degrades linearly with increasing output resistance above 27Ω, which rises at lower oscillator frequencies or smaller flying capacitors.
Can the LTC1046CS8#PBF generate +10V from a 5V input?
No, the LTC1046CS8#PBF does not support voltage doubling to +10V. Its architecture supports only inversion (VOUT = –VIN), division (VOUT = VIN/2), and multiplication by integer factors using stacked configurations - but standard single-device operation yields only negative or fractional outputs. For +10V generation, a dedicated charge-pump doubler like the LTC1550 or inductive boost converter is required.
How does the BOOST pin affect the LTC1046CS8#PBF's performance?
Connecting the BOOST pin (Pin 1) to V+ triples the internal oscillator frequency - from ~30kHz to ~90kHz at 5V - which directly reduces the 1/fC component of output impedance. This lowers effective ROUT, improves load regulation, and decreases output voltage ripple, especially under dynamic loads. However, higher frequency increases switching losses, slightly reducing power efficiency above ~50kHz.
Is the LTC1046CS8#PBF pin-compatible with the ICL7660S?
Yes, the LTC1046CS8#PBF is pin-for-pin and functionally compatible with the ICL7660S in SO-8 packages. Both share identical pin assignments (V+, OSC, LV, VOUT, BOOST, CAP+, GND, CAP–), enabling direct substitution. However, the LTC1046CS8#PBF provides 2.5× higher output current (50mA vs. 20mA) and lower output resistance (27Ω vs. 55Ω), requiring verification of thermal margin in existing layouts.
What is the role of the LV pin on the LTC1046CS8#PBF?
The LV pin (Pin 3) establishes the logic ground reference for the LTC1046CS8#PBF's internal CMOS circuitry. When V+ ≥ 3V, an internal switch automatically connects LV to GND (Pin 6), allowing LV to be left floating or tied to GND. For V+ < 3V, LV must be externally connected to GND to ensure proper oscillator and switch gate drive - failure to do so results in undefined operation or complete failure.
LTC1046CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1046CS8#PBF FAQ
1.How can I place an order for LTC1046CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1046CS8#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 LTC1046CS8#PBF reliable?
The price and inventory of LTC1046CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1046CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1046CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1046CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1046CS8#PBF?
LTC1046CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1046CS8#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 LTC1046CS8#PBF?
For technical support, including LTC1046CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1046CS8#PBF requirements.
6.How does Aetrix verify that LTC1046CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1046CS8#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 LTC1046CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1046CS8#PBF?
All LTC1046CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1046CS8#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 LTC1046CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1046CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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