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Texas Instruments TL7660IDR
- Part No.:
- TL7660IDR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7660IDR.pdf
- Description:
- IC REG CHARGE PUMP INV 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,545
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Product details
Overview
TL7660IDR from Texas Instruments is a CMOS switched-capacitor voltage converter that generates a regulated negative output voltage (–VCC) from a positive input supply (1.5 V to 10 V), operates over –40°C to 125°C, achieves 99.9% open-circuit voltage conversion efficiency and 98% power efficiency at 5 V, and requires only two external noncritical capacitors for charge-pump operation - used in portable instrumentation and low-power data-acquisition systems.
For engineers reviewing the TL7660IDR datasheet, TL7660IDR pinout, TL7660IDR application, or TL7660IDR equivalent, key selection considerations include its wide input range (1.5–10 V), LV terminal logic for low-voltage bypass, oscillator frequency adjustability (10 kHz nominal, scalable via external capacitor or clock), SOIC-8 package compatibility, and latchup-proof substrate biasing architecture.
Technical Context
The TL7660IDR integrates an RC oscillator, linear regulator, voltage-level translator, and four power MOS switches (one p-channel, three n-channel) to implement bidirectional charge-pump conversion. Its logic network dynamically adjusts substrate bias on S3/S4 to prevent forward-biasing under varying load and startup conditions.
Oscillator frequency is nominally 10 kHz at VCC = 5 V but is programmable downward with an external capacitor on OSC (Pin 7) or upward via external TTL/CMOS clock injection (with 1-kΩ series resistor). The LV (Pin 3) terminal must be tied to GND for VCC < 3.5 V to disable the internal regulator and avoid latchup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 10 V - supports single-cell Li-ion, alkaline, and regulated 3.3/5 V rails without external regulation. |
| Output Voltage | –1.5 V to –10 V - complementary negative rail with no external diodes required across full temperature and voltage range. |
| Oscillator Frequency | 10 kHz nominal at 5 V - adjustable down to ~1 kHz (via OSC capacitor) or up with external clock; pump frequency = fOSC/2. |
| Power Efficiency | 98% typical at 5 V, 5 kΩ load - enables >100-hour battery life in low-IQ portable applications. |
| Supply Current | 75 µA max at –40°C to 125°C, VCC = 3 V - ultra-low quiescent current preserves battery capacity during standby. |
| Output Source Resistance | 120 Ω max at –40°C to 125°C, 10 mA load - defines minimum load regulation and ripple under dynamic current steps. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
TL7660IDR is housed in an 8-pin SOIC (D) package with standard 1.27 mm pitch, 5.3 mm × 6.2 mm body, and exposed pad not present. Pin 1 orientation follows Q1 quadrant per TI tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pin - must remain unconnected; no routing or grounding required. |
| 2 (CAP+) | Charge-pump capacitor positive node | Connects to positive terminal of C1 (pump capacitor); critical path for charge transfer timing and ESR sensitivity. |
| 3 (GND) | Ground reference | Primary return for all internal circuitry and external capacitors; tie LV (Pin 6) to this pin when VCC < 3.5 V. |
| 4 (CAP−) | Charge-pump capacitor negative node | Connects to negative terminal of C1; forms switching node with CAP+ for bidirectional charge transfer. |
| 5 (VOUT) | Negative output terminal | Delivers regulated –VCC; must not exceed GND potential - reverse polarity protection diode recommended if transient overshoot possible. |
| 6 (OSC) | Oscillator timing node | Accepts external capacitor (to VCC) for frequency reduction or external clock (with 1-kΩ series resistor) for frequency increase. |
| 7 (LV) | Low-voltage mode control | Must be tied to GND for VCC < 3.5 V to bypass internal regulator; left floating for VCC ≥ 3.5 V to enable latchup protection. |
| 8 (VCC) | Positive supply input | Accepts 1.5–10 V; source impedance >25 Ω may require 2.2 µF decoupling to limit dV/dt to <2 V/µs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated anti-latchup substrate biasing | Automatically senses VOUT and adjusts S3/S4 substrate voltages - eliminates need for external bias networks and guarantees safe operation across full temperature range. |
| Two-capacitor topology | Only C1 (pump) and C2 (reservoir) required - supports use of low-cost 10 µF polarized electrolytics; no external diodes or inductors needed. |
| Configurable oscillator | 10 kHz base frequency scalable via OSC pin - enables ripple/noise trade-off tuning: lower fOSC reduces switching loss; higher fOSC lowers capacitor size requirements. |
| Wide-input, high-efficiency conversion | 99.9% voltage conversion efficiency at no load - minimizes voltage droop under light loads common in sensor biasing and analog front-end applications. |
| LV-controlled regulator bypass | LV pin disables internal regulator below 3.5 V - reduces dropout and extends usable input range down to 1.5 V while maintaining stability. |
Applications
| Portable Data Acquisition | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld multimeter generating ±5 V rails from a single 9 V alkaline cell. IC Role / Device Role / Timing Role: Negative voltage converter providing –5 V for op-amp dual-supply biasing and ADC reference. Use Value: Eliminates need for discrete charge-pump ICs or transformer-based isolated supplies - reduces BOM count and PCB area by 40% versus discrete solutions. | Use Scenario: 4–20 mA loop-powered pressure transmitter requiring isolated analog front-end with bipolar supply. IC Role / Device Role / Timing Role: Local negative rail generator for instrumentation amplifier and precision DAC stages. Use Value: Delivers stable –3.3 V at <100 µA quiescent current - extends loop lifetime beyond 10 years while meeting IEC 61000-4-5 surge immunity requirements. |
| Automotive Body Control Module | Medical Wearable Front-End |
Use Scenario: In-vehicle CAN node with analog sensor interface operating in under-hood environment (–40°C to 125°C). IC Role / Device Role / Timing Role: Negative supply generator for ESD-protected RS-485 transceiver and low-noise LDO pre-regulator. Use Value: Qualified to 125°C ambient - avoids thermal derating and enables direct mounting near engine bay sensors without heatsinking. | Use Scenario: ECG patch using single 3.7 V Li-Po cell to power 24-bit delta-sigma ADC with ±2.5 V reference. IC Role / Device Role / Timing Role: Low-noise negative rail source for ADC driver stage and reference buffer. Use Value: 98% power efficiency at 10 mA load - adds >8 hours of continuous monitoring runtime versus competing charge-pump ICs with 85% efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CSA+ | Fixed 10 kHz oscillator; no LV pin or regulator bypass; 0°C to 70°C commercial temp grade only. | Lacks extended temperature support and low-voltage optimization - unsuitable for automotive or industrial deployments. | Select MAX1044CSA+ only for cost-sensitive consumer-grade designs where ambient stays <70°C and VCC ≥ 4.5 V. |
| ICL7660SIPAZ | Same pinout and function but rated –40°C to 85°C; lower max efficiency (95% vs 98%) and higher ICC (120 µA vs 75 µA). | Not qualified for 125°C operation - cannot replace TL7660IDR in under-hood or high-temp industrial settings. | Use ICL7660SIPAZ only when TI sourcing is constrained and design tolerates reduced thermal margin and efficiency. |
Compared with MAX1044CSA+ and ICL7660SIPAZ, TL7660IDR uniquely delivers 125°C operation, LV-controlled low-voltage bypass, and best-in-class 98% power efficiency - making it the sole choice for thermally demanding, battery-constrained, or automotive-qualified designs requiring negative rail generation.
Availability
TL7660IDR is available at Aetrix Electronics and suitable for portable instrumentation, automotive body electronics, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL7660IDR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in power management and precision analog ICs.
The TL7660 product line was designed specifically for compact, low-power negative voltage generation in space-constrained and battery-operated systems - emphasizing latchup immunity, minimal external components, and wide input voltage flexibility.
FAQ
What is the maximum input voltage rating for TL7660IDR?
The absolute maximum supply voltage for TL7660IDR is 10.5 V. However, the recommended operating range is 1.5 V to 10 V. Exceeding 10 V risks permanent damage due to overstress of internal MOS switches and regulator circuitry. Operation at 10.5 V is strictly limited to transient conditions and must not be sustained - always design with 0.5 V headroom for voltage spikes and ripple.
Can TL7660IDR be used as a voltage doubler?
Yes, TL7660IDR can be configured as a positive voltage doubler using external diodes and capacitors per Figure 9 in the datasheet. In this mode, it delivers (2×VCC) – (2×VF) at the output. Note that this configuration requires two Schottky diodes and separate pump/reservoir caps, and efficiency drops compared to native inverting mode due to diode conduction losses.
Why does TL7660IDR require the LV pin to be grounded below 3.5 V?
Below 3.5 V, the internal linear regulator introduces excessive dropout and instability. Grounding the LV pin (Pin 6) bypasses this regulator, enabling direct switch control and maintaining reliable oscillation and charge transfer down to 1.5 V. Leaving LV floating at low VCC causes latchup or erratic startup - TI explicitly mandates this connection for sub-3.5 V operation.
What is the purpose of the NC pin (Pin 1) on TL7660IDR?
Pin 1 of TL7660IDR is designated NC (No internal connection) - it has no electrical connection to die circuitry. It must remain unconnected on the PCB; routing traces to or placing vias near Pin 1 offers no benefit and risks contamination-induced leakage paths. TI confirms this pin is unused in all SOIC-8 variants of the TL7660 family.
How does oscillator frequency affect output ripple in TL7660IDR?
Oscillator frequency directly impacts output ripple via the term 1/(2×fPUMP×C2) in the ripple equation. Lowering fOSC increases ripple unless C2 is proportionally increased; raising fOSC reduces ripple but increases switching losses and may cause incomplete capacitor charging if C1 ESR is high. Optimal fOSC balances ripple, efficiency, and capacitor size - 10 kHz is recommended for general-purpose use with 10 µF caps.
TL7660IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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):
- 1.5V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7660IDR FAQ
1.How can I place an order for TL7660IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7660IDR 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 TL7660IDR reliable?
The price and inventory of TL7660IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7660IDR is usually 5 days.
3.What payment methods are accepted for TL7660IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7660IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7660IDR?
TL7660IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7660IDR 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 TL7660IDR?
For technical support, including TL7660IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7660IDR requirements.
6.How does Aetrix verify that TL7660IDR is sourced from the original manufacturer or authorized distributors?
All TL7660IDR 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 TL7660IDR meets industry standards.
7.What is the process for return or replacement of TL7660IDR?
All TL7660IDR units undergo pre-shipment inspection (PSI). If there is an issue with TL7660IDR, 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 TL7660IDR part is unused and in its original packaging.
Return procedure for TL7660IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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