My Inquiry
My Account
Analog Devices Inc. LTC1144CS8#TRPBF
- Part No.:
- LTC1144CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1144CS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP INV 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:21,760
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1144CS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter that inverts a positive input (2V–18V) to a complementary negative output (–2V to –18V). It integrates an internal oscillator, divide-by-two logic, level shifter, and four power MOSFETs; requires only two external 10µF capacitors; delivers ≤120Ω output resistance at 15V/20mA; and supports shutdown current of 8µA. It is used in data acquisition systems for generating precision bipolar supplies.
For engineers reviewing the LTC1144CS8#TRPBF datasheet, LTC1144CS8#TRPBF pinout, LTC1144CS8#TRPBF application, or LTC1144CS8#TRPBF equivalent, key selection criteria include input voltage range (2V–18V), oscillator frequency control via BOOST/OSC pins, shutdown quiescent current (8µA), output resistance (56Ω typical), and SOIC-8 package compatibility with space-constrained industrial and battery-powered designs.
Technical Context
The LTC1144CS8#TRPBF implements a charge-pump topology using internal N-channel MOSFET switches and a two-phase clock derived from its on-chip oscillator. Its oscillator operates at 10kHz (unloaded) and can be overdriven externally or slowed with a capacitor on OSC (Pin 7); tying BOOST (Pin 1) to V+ raises frequency ~10×. A dedicated logic circuit prevents substrate turn-on of the N-channel power switches.
Output regulation is unregulated open-loop, with voltage conversion efficiency reaching 99.9% at no load and power efficiency 93% typical at 10kHz/2kΩ load. Output impedance is dominated by 1/(f × C₁) at low frequencies and MOSFET on-resistance at high frequencies - enabling design trade-offs between ripple, load capability, and efficiency via C₁/C₂ selection and oscillator tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 18V - supports single-cell LiFePO₄ up to 15V wall adapters without external regulation. |
| Output Voltage Range | –2V to –18V - provides rail-to-rail inverted supply matching input magnitude, e.g., +15V → –15V. |
| Oscillator Frequency | 10kHz (default), adjustable to ~100kHz with BOOST pin - higher frequency reduces output impedance and ripple under load. |
| Output Resistance | 56Ω typical (15V/20mA), ≤120Ω max - defines voltage droop under load; lower than LTC1044 (150Ω). |
| Shutdown Current | 8µA - enables ultra-low-power sleep mode in portable instrumentation and sensor nodes. |
| Conversion Efficiency | 93% typical (power), 99.9% typical (voltage, open-circuit) - minimizes heat rise in sealed enclosures. |
| Operating Temp | 0°C to 70°C - rated for commercial-grade embedded systems and test equipment environments. |
Pinout & Package
Package: 8-Lead Plastic SOIC (S8), 0.150-inch width, RoHS-compliant lead-free finish, JEDEC MS-012AC standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Oscillator frequency multiplier control | Tie to V+ to raise switching frequency ~10×; reduces output impedance and improves transient response. |
| CAP+ (2) | Positive pump capacitor terminal | Connects to + terminal of flying capacitor C₁; carries bidirectional charge-transfer current. |
| GND (3) | Ground reference | Common return for all internal logic and power paths; must be low-impedance connection to system ground plane. |
| CAP– (4) | Negative pump capacitor terminal | Connects to – terminal of flying capacitor C₁; forms charge-transfer loop with CAP+ and internal switches. |
| VOUT (5) | Negative output terminal | Delivers inverted output voltage; output impedance ≤120Ω enables ≤200mV drop at 20mA load. |
| SHDN (6) | Active-low shutdown enable | Pull low to disable oscillator and reduce supply current to 8µA; floating or tied to V+ enables operation. |
| OSC (7) | External oscillator control | Accepts external clock or capacitor for frequency adjustment; 4µA drive capability allows direct CMOS gate interface. |
| V+ (8) | Positive input supply | Primary power input (2V–18V); powers internal logic, gate drivers, and charge pump; transient-rated to 20V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFET switch array | Four on-chip N-channel power switches eliminate external discrete FETs and reduce BOM count. |
| Adjustable oscillator architecture | Frequency tunable from ~1kHz to ~100kHz via OSC pin capacitor or BOOST pin override - enables ripple vs. efficiency optimization. |
| Substrate latch-up prevention logic | Dedicated circuit blocks parasitic NPN turn-on in power MOSFETs - ensures robust operation across temperature and load transients. |
| Low-noise charge-pump topology | No inductors or diodes required; uses only two noncritical 10µF electrolytic/tantalum capacitors - simplifies layout and lowers EMI. |
| High open-circuit conversion fidelity | 99.9% voltage conversion efficiency means VOUT ≈ –VIN with negligible offset - critical for precision analog front-ends. |
Applications
| Instrumentation Signal Conditioning | Data Acquisition Power Rails |
|---|---|
Use Scenario: Providing dual ±15V supplies for op-amp-based anti-aliasing filters and programmable gain amplifiers in portable DMMs. IC Role / Device Role / Timing Role: Inverting voltage converter generating clean negative rail from single 15V battery or adapter; operates at 10kHz to minimize audible noise. Use Value: Eliminates need for isolated DC/DC modules; 56Ω output resistance ensures <150mV droop at 20mA sensor bias current. | Use Scenario: Powering successive-approximation ADCs (e.g., LTC1864) requiring stable –5V reference supply from 9V input. IC Role / Device Role / Timing Role: Unregulated inverter configured with feedback resistor network (Figure 12) to regulate –5V output; SHDN pin enables power cycling between conversions. Use Value: Achieves <20Ω effective output resistance and <0.1% line regulation - meets ADC reference stability requirements without LDO post-regulation. |
| Battery-Powered Sensor Nodes | Automotive Body Control Modules |
Use Scenario: Generating –3.3V bias for MEMS accelerometer signal chain in wireless IoT node powered by 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Low-voltage inverter operating from 3.6V input; BOOST pin unused, OSC pin left open for default 10kHz operation. Use Value: 8µA shutdown current extends battery life; 120Ω max output resistance supports 100µA sensor bias with <12mV error. | Use Scenario: Creating isolated –12V supply for CAN transceiver bias in 12V automotive subsystems with wide input variation (9V–16V). IC Role / Device Role / Timing Role: Input-tolerant inverter (2V–18V range) delivering –12V from vehicle battery; GND pin referenced to chassis ground per ISO 11898. Use Value: Withstands cold-crank transients (down to 2V) and maintains functional output - avoids brownout-induced CAN bus resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1044CN8#TRPBF | Higher 150Ω max output resistance; fixed 10kHz oscillator; no BOOST pin; DIP-8 only | Less suitable for >10mA loads or low-ripple applications; limited to through-hole assembly | Select when cost sensitivity outweighs performance; not recommended for new SOIC-based designs. |
| LTC1054CS8#TRPBF | Regulated –15V output; 100mA output current; 2.5mA quiescent current; includes internal regulation loop | Used where precise, load-invariant negative voltage is mandatory (e.g., DAC reference); higher IQ increases standby power | Choose for regulated output stability; LTC1144CS8#TRPBF preferred when unregulated inversion suffices and ultra-low IQ is critical. |
Compared with LTC1044CN8#TRPBF, LTC1144CS8#TRPBF offers lower output resistance and SOIC packaging; versus LTC1054CS8#TRPBF, it trades regulation for 8µA shutdown current and simpler external component count - making it optimal for cost- and power-sensitive unregulated bipolar rail generation.
Availability
LTC1144CS8#TRPBF is available at Aetrix Electronics and suitable for data acquisition systems, battery-powered instrumentation, and automotive body electronics requiring stable component supply with commercial-temperature grade reliability and RoHS-compliant packaging.
Supply support for LTC1144CS8#TRPBF 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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC1144 family.
The LTC1144 belongs to Linear's precision switched-capacitor converter product line, designed specifically for low-noise, inductorless negative voltage generation in space- and power-constrained analog systems.
FAQ
What is the minimum input voltage supported by the LTC1144CS8#TRPBF?
The LTC1144CS8#TRPBF supports a minimum input voltage of 2V, enabling operation from partially discharged lithium iron phosphate (LiFePO₄) cells or low-voltage wall adapters. This 2V lower limit is specified across the full 0°C to 70°C operating temperature range and is validated per Absolute Maximum Ratings and Electrical Characteristics tables in the official datasheet.
Can the LTC1144CS8#TRPBF generate regulated output voltages?
The LTC1144CS8#TRPBF is an unregulated charge-pump inverter; its output voltage tracks –VIN with high fidelity (99.9% conversion efficiency open-circuit) but lacks internal feedback. However, external regulation is possible - Figure 12 in the datasheet shows a –5V regulated output using a transistor and resistive divider. The LTC1144CS8#TRPBF itself does not provide regulation, but serves as the core inverting stage in such circuits.
How does the BOOST pin affect oscillator frequency in the LTC1144CS8#TRPBF?
Tying the BOOST pin (Pin 1) of the LTC1144CS8#TRPBF to V+ increases the internal oscillator frequency by approximately 10× - from the default 10kHz to ~100kHz. This reduces output impedance and ripple under load, improving dynamic performance. Leaving BOOST open or grounded restores the base frequency. The effect is confirmed in Typical Performance Characteristics (TPC03) and Applications Information sections of the datasheet.
Is the LTC1144CS8#TRPBF pin-compatible with the LTC1044 series?
No, the LTC1144CS8#TRPBF is not pin-compatible with the LTC1044 series. While both are 8-pin SOIC inverters, the pin functions differ: LTC1144CS8#TRPBF assigns Pin 1 to BOOST and Pin 7 to OSC, whereas LTC1044 uses Pin 1 for V+, Pin 7 for OSC, and has no BOOST function. PCB layout and schematic must be redesigned - direct replacement is not feasible without hardware revision.
What external capacitors are required for basic operation of the LTC1144CS8#TRPBF?
The LTC1144CS8#TRPBF requires two external capacitors: a 10µF flying capacitor (C₁) between CAP+ (Pin 2) and CAP– (Pin 4), and a 10µF reservoir capacitor (C₂) between VOUT (Pin 5) and GND (Pin 3). Aluminum or tantalum electrolytics are recommended; tolerance and ESR are non-critical. These values are validated in Typical Application (Figure 8) and Electrical Characteristics testing conditions.
LTC1144CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 4kHz ~ 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1144CS8#TRPBF FAQ
1.How can I place an order for LTC1144CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1144CS8#TRPBF 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 LTC1144CS8#TRPBF reliable?
The price and inventory of LTC1144CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1144CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1144CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1144CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1144CS8#TRPBF?
LTC1144CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1144CS8#TRPBF 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 LTC1144CS8#TRPBF?
For technical support, including LTC1144CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1144CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1144CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1144CS8#TRPBF 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 LTC1144CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1144CS8#TRPBF?
All LTC1144CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1144CS8#TRPBF, 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 LTC1144CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1144CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1144CS8#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
