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Texas Instruments TL7660CDR
- Part No.:
- TL7660CDR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7660CDR.pdf
- Description:
- IC REG CHARGE PUMP INV 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,369
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Product details
Overview
TL7660CDR from Texas Instruments is a CMOS switched-capacitor voltage converter that performs positive-to-negative supply conversion with no external diodes required. It operates from 1.5 V to 10 V input, delivers –1.5 V to –10 V output, achieves 99.9% open-circuit voltage conversion efficiency, and supports oscillator frequency adjustment via the OSC pin. It is used in portable electronics for generating clean negative rails from single-supply systems.
For engineers reviewing the TL7660CDR datasheet, TL7660CDR pinout, TL7660CDR application, or TL7660CDR equivalent, key selection criteria include its SOIC-8 package, –40°C to 85°C operating range, LV pin control for low-voltage bypass, dual-mode operation (inverting or doubling), and reliance on only two noncritical external capacitors.
Technical Context
The TL7660CDR integrates an RC oscillator (nominal 10 kHz at VCC = 5 V), voltage-level translator, linear regulator, and four power MOS switches (one p-channel, three n-channel) in a latch-up-free architecture. Its logic network dynamically biases switch substrates based on VOUT to prevent forward conduction under all conditions.
Operation mode is determined by LV pin state: tied to GND for VCC < 3.5 V to bypass the internal regulator; left floating for VCC > 3.5 V to enable full regulation and anti-latchup protection. The OSC pin allows frequency reduction via external capacitor or increase via external clock (with series 1-kΩ resistor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 10 V - supports battery-powered and low-voltage logic supplies without external regulation |
| Output Voltage Range | –1.5 V to –10 V - complementary negative rail matching input magnitude, usable as bias or op-amp dual supply |
| Oscillator Frequency | 10 kHz nominal at 5 V - sets charge-pump switching rate; adjustable down to ~1 kHz or up via external clock |
| Voltage Conversion Efficiency | 99.9% typical (open-circuit) - minimizes quiescent loss in low-power standby modes |
| Power Efficiency | 98% typical at RL = 5 kΩ - enables high-efficiency operation under moderate load without heat sinking |
| Supply Current | 45 µA typical at 5 V, 25°C - ultra-low ICC supports long battery life in portable instrumentation |
| Output Source Resistance | 70 Ω typical at 5 V, 20 mA, 25°C - defines load regulation and ripple under dynamic current draw |
Pinout & Package
TL7660CDR is housed in an 8-pin SOIC (D) package per JEDEC MS-012, with 1.27 mm pitch, 5.3 mm × 6.2 mm body, and RoHS-compliant NiPdAu lead finish. Thermal impedance θJA is 97°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pad; must remain unconnected to avoid parasitic coupling or ESD path |
| 2 (CAP+) | Positive pump capacitor terminal | Connects to positive electrode of C1; polarity critical when using polarized electrolytics |
| 3 (GND) | Ground reference | System ground return for all internal circuitry and external capacitors |
| 4 (CAP−) | Negative pump capacitor terminal | Connects to negative electrode of C1; forms charge-transfer node with CAP+ |
| 5 (VOUT) | Negative output terminal | Delivers regulated inverted voltage; must not exceed GND potential to prevent latchup |
| 6 (OSC) | Oscillator timing/control | Accepts external capacitor for frequency reduction or external clock (with 1-kΩ series resistor) |
| 7 (LV) | Low-voltage bypass control | Tie to GND for VCC < 3.5 V to disable regulator; leave floating for VCC > 3.5 V |
| 8 (VCC) | Positive supply input | Primary power input; absolute max 10.5 V; requires local 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| No external diodes required | Enables full temperature- and voltage-range operation without discrete diode losses or layout complexity |
| Two external capacitors only | Reduces BOM count and PCB area; accepts low-cost 10 µF polarized electrolytics for both pump and reservoir |
| LV pin for regulator bypass | Extends functional operation down to 1.5 V input by disabling internal regulator below 3.5 V |
| Configurable oscillator | Allows trade-off between ripple (higher fOSC) and efficiency (lower fOSC with larger C1/C2) |
| Latch-up protection circuitry | Active substrate biasing prevents destructive latchup during startup, short-circuit, or transient overvoltage |
Applications
| Portable Instrumentation Power | Data Acquisition Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld multimeters and sensor loggers requiring dual-rail analog front-ends. IC Role / Device Role / Timing Role: Negative voltage generator providing –5 V rail for op-amps and ADC references from a 5 V Li-ion supply. Use Value: Eliminates need for isolated DC/DC or transformer-based solutions, reducing size and EMI while maintaining 99.9% voltage conversion efficiency at light loads. | Use Scenario: Industrial data acquisition modules converting ±10 V sensor signals with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Precision negative supply source for ADC driver amplifiers and reference buffers in single-supply systems. Use Value: Delivers stable –10 V output with <70 Ω source resistance, enabling <0.01% gain error across temperature without trimming. |
| Low-Power RS-232 Transceiver Bias | Split-Rail Audio Amplifier Supply |
Use Scenario: Embedded microcontrollers interfacing with legacy RS-232 peripherals using integrated transceivers. IC Role / Device Role / Timing Role: Generates compliant –3 V to –15 V logic-level bias from 3.3 V MCU supply, supporting TIA-232-F voltage thresholds. Use Value: Operates reliably at 3.3 V input with LV pin grounded, achieving full specification compliance without external regulators or charge pumps. | Use Scenario: Portable audio DACs and headphone amplifiers needing symmetrical ±2.5 V rails from a 5 V USB source. IC Role / Device Role / Timing Role: Bidirectional voltage splitter creating matched positive and negative rails using shared pump capacitor topology. Use Value: Reduces output impedance by parallel switch conduction, enabling >50 mA continuous output per rail with <100 mV droop at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CPA+ | Pin-compatible SOIC-8; fixed 10 kHz oscillator; no LV pin; requires external diode for full temp range | Lacks low-voltage bypass capability; limited to ≥2.5 V input; higher quiescent current (120 µA typ) | Choose MAX1044CPA+ only if legacy design reuse is required and input stays ≥2.5 V with no need for sub-3.5 V operation. |
| ICL7660SIPAZ | SOIC-8; improved 99.9% efficiency; enhanced ESD rating; same pinout; LV pin present but functionally identical | Identical electrical behavior and footprint; optimized for higher reliability in industrial environments | ICL7660SIPAZ is a direct drop-in replacement with superior robustness; preferred for new designs targeting extended lifecycle. |
Compared with TL7660CDR, MAX1044CPA+ lacks LV control and requires external diodes, limiting low-voltage flexibility, while ICL7660SIPAZ offers identical functionality with enhanced process and ESD tolerance-making it the optimal upgrade path without layout change.
Availability
TL7660CDR is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and RS-232 interface circuits requiring stable component supply across industrial temperature ranges.
Supply support for TL7660CDR 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 company specializing in analog and embedded processing technologies, with leadership in power management and precision signal chain solutions.
The TL7660 product line was designed specifically for compact, low-component-count DC voltage inversion in space-constrained portable and battery-operated systems where efficiency and simplicity are critical.
FAQ
What is the maximum input voltage rating for the TL7660CDR?
The absolute maximum supply voltage (VCC) for TL7660CDR is 10.5 V. Operation above this level risks permanent damage. The recommended operating range is 1.5 V to 10 V, with full specification compliance guaranteed within that window. Exceeding 10.5 V-even briefly-may trigger latchup or junction breakdown, especially when combined with elevated ambient temperature.
Can the TL7660CDR be used as a voltage doubler, and how is it configured?
Yes, TL7660CDR supports voltage doubling by reconfiguring external components per Figure 9 in the datasheet. Connect diodes D1 and D2 with appropriate polarities and use C1/C2 as pump/reservoir capacitors. Output becomes (2 × VCC) – (2 × VF), where VF is diode forward voltage. This configuration requires no internal changes to TL7660CDR and retains all its built-in protection features.
Why does the TL7660CDR require the LV pin to be grounded for inputs below 3.5 V?
The LV pin disables the internal series regulator when tied to GND, allowing TL7660CDR to operate down to 1.5 V input. Above 3.5 V, leaving LV floating enables the regulator to maintain latch-up immunity by dynamically biasing internal switch substrates. Incorrect LV connection-e.g., grounding LV at 5 V-causes device malfunction or irreversible latchup due to improper substrate biasing.
What is the purpose of the NC pin (Pin 1) on the TL7660CDR SOIC package?
Pin 1 of TL7660CDR is designated NC (No internal connection) and contains no internal bond wire or circuit connection. It must remain unconnected on the PCB to avoid introducing parasitic capacitance, noise coupling, or unintended ESD discharge paths. Routing traces or placing vias directly to Pin 1 is discouraged, as it may degrade noise immunity or cause intermittent failures in high-reliability applications.
How does oscillator frequency adjustment affect TL7660CDR performance?
Lowering TL7660CDR oscillator frequency (e.g., from 10 kHz to 1 kHz using a 100-pF OSC capacitor) reduces switching losses and improves power efficiency at light loads-but requires proportional increase in C1/C2 values (e.g., 10 µF → 100 µF) to maintain low output impedance. Raising frequency improves ripple rejection but increases ICC and may degrade efficiency if capacitor ESR dominates losses.
TL7660CDR 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL7660CDR FAQ
1.How can I place an order for TL7660CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7660CDR 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 TL7660CDR reliable?
The price and inventory of TL7660CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7660CDR is usually 5 days.
3.What payment methods are accepted for TL7660CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7660CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7660CDR?
TL7660CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7660CDR 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 TL7660CDR?
For technical support, including TL7660CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7660CDR requirements.
6.How does Aetrix verify that TL7660CDR is sourced from the original manufacturer or authorized distributors?
All TL7660CDR 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 TL7660CDR meets industry standards.
7.What is the process for return or replacement of TL7660CDR?
All TL7660CDR units undergo pre-shipment inspection (PSI). If there is an issue with TL7660CDR, 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 TL7660CDR part is unused and in its original packaging.
Return procedure for TL7660CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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