My Inquiry
My Account
Texas Instruments TL7660CD
- Part No.:
- TL7660CD
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL7660CD.pdf
- Description:
- IC REG CHARGE PUMP INV 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:561
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL7660CD 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), requiring only two external noncritical capacitors. It operates as a negative converter or voltage doubler, delivers up to 20 mA output current, achieves 98% power efficiency at 5 V, and supports –40°C to 85°C operation in SOIC-8 packaging. It is used in portable instrumentation for dual-rail op-amp biasing.
For engineers reviewing the TL7660CD datasheet, TL7660CD pinout, TL7660CD application, or TL7660CD equivalent, key selection considerations include its 10 kHz nominal oscillator frequency, LV terminal configuration for low-voltage bypass, output source resistance of 70 Ω at 5 V/20 mA, and compatibility with polarized electrolytic pump/reservoir capacitors.
Technical Context
The TL7660CD integrates an RC oscillator, linear regulator, voltage-level translator, and four power MOS switches (one p-channel, three n-channel) to implement charge-pump inversion. Its logic network dynamically biases switch substrates to prevent latch-up across temperature and load conditions.
Oscillator frequency is nominally 10 kHz at VCC = 5 V but is adjustable via external capacitor on OSC pin or overdrive with external clock. The LV pin must be grounded for VCC < 3.5 V to bypass the internal regulator; it must float for VCC > 3.5 V to ensure latch-up immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 10 V - supports single-cell Li-ion, 3.3 V, and 5 V systems without external regulation |
| Output Voltage | –VCC (negative converter mode) - provides rail-to-rail complementary supply for op-amps and ADCs |
| Max Output Current | 20 mA at 5 V - sufficient for biasing low-power analog signal chains and sensor interfaces |
| Oscillator Frequency | 10 kHz nominal (VCC = 5 V) - enables use of low-cost 10 µF electrolytic capacitors; adjustable down to ~1 kHz or up via external clock |
| Power Efficiency | 98% typical (RL = 5 kΩ) - minimizes thermal rise and extends battery life in portable designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial and commercial environments, not automotive |
| Package | SOIC-8 (D package) - standard surface-mount footprint compatible with automated assembly and legacy PCB layouts |
Pinout & Package
TL7660CD is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 5.3 mm × 6.2 mm body, and exposed pad not present. Pin 1 is bottom-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused; must remain unconnected - no routing or pull-up/pull-down required |
| 2 (CAP+) | Positive pump capacitor terminal | Connects to positive lead of C1 (pump cap); polarity critical for reliable operation |
| 3 (GND) | Ground reference | System ground return for all internal circuitry and external capacitors |
| 4 (CAP−) | Negative pump capacitor terminal | Connects to negative lead of C1; forms charge-transfer path with CAP+ |
| 5 (VOUT) | Negative output voltage node | Delivers inverted supply; must not exceed GND potential to avoid latch-up |
| 6 (OSC) | Oscillator timing node | Accepts external capacitor to reduce frequency or external clock (with 1 kΩ series resistor) to increase it |
| 7 (LV) | Low-voltage bypass control | Ground for VCC < 3.5 V to disable regulator; leave floating for VCC > 3.5 V |
| 8 (VCC) | Positive input supply | Primary power input; ESD protection rated to ±2 kV HBM; requires local 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| No external diode required | Eliminates discrete diode cost, board space, and forward-voltage drop loss across full temp/voltage range |
| Auto-substrate biasing | Prevents latch-up by dynamically adjusting n-channel switch substrate potentials based on VOUT level |
| Voltage-doubler capability | Configurable to generate up to +18.6 V from 10 V input - useful for LCD bias or flash programming |
| Open-circuit conversion efficiency | 99.9% typical - preserves battery voltage under light-load standby conditions |
| Full characterization at 3 V | Guarantees performance down to 1.5 V supply - enables direct integration with single-cell alkaline or LiFePO4 sources |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Powering rail-to-rail instrumentation amplifiers in handheld ECG monitors using a single 3.3 V Li-ion cell. IC Role / Device Role / Timing Role: Negative voltage generator providing –3.3 V bias for dual-supply op-amps driving 16-bit sigma-delta ADCs. Use Value: Enables true bipolar signal acquisition without external DC/DC converters; maintains 98% efficiency at 5 mA load to extend battery runtime. | Use Scenario: Generating isolated negative supply for 24-bit precision ADC front-ends in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Low-noise negative rail generator supporting 110 dB SNR measurements with minimal switching ripple. Use Value: Achieves <10 mVPP output ripple with 10 µF/low-ESR capacitors - avoids post-regulation filtering and reduces BOM count. |
| Audio Signal Processing | Test & Measurement Equipment |
Use Scenario: Biasing high-fidelity audio op-amps in battery-powered spectrum analyzers requiring clean ±5 V rails. IC Role / Device Role / Timing Role: Inverting charge-pump supplying –5 V to low-distortion JFET-input op-amps in anti-aliasing filter stages. Use Value: Delivers 20 mA at <0.001% THD+N due to absence of magnetic components - eliminates transformer-induced crosstalk. | Use Scenario: Providing dual supplies for digital potentiometers and programmable gain amplifiers in automated calibration fixtures. IC Role / Device Role / Timing Role: Precision negative rail source enabling 0.1% gain accuracy over temperature via matched ±10 V references. Use Value: Maintains stable –10 V output across –40°C to 85°C with <100 ppm/°C drift - eliminates need for trimming resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CSA+ | Pin-compatible SOIC-8; 10 kHz fixed oscillator; no LV pin; requires external diodes for >5 V operation | Lacks low-voltage bypass mode; limited to ≤5 V input without external diodes; lower max efficiency (95%) | Choose MAX1044CSA+ only if legacy design reuse is required and input stays ≤5 V with diode support |
| ICL7660SIPAZ | SOIC-8; enhanced latch-up immunity; 99% power efficiency; supports 1.4 V min supply | Wider temp range (–40°C to 125°C); higher ICC (135 µA vs. 120 µA); same pinout but different marking | ICL7660SIPAZ suits extended-temp industrial use but requires validation of LV-equivalent behavior in low-VCC mode |
Compared with TL7660CD, MAX1044CSA+ lacks integrated latch-up protection and requires external diodes above 5 V, while ICL7660SIPAZ offers wider temperature range and slightly better efficiency but has unconfirmed LV pin equivalence - TL7660CD remains optimal for cost-sensitive 3.3 V/5 V portable designs needing guaranteed low-VCC operation.
Availability
TL7660CD is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, audio signal processing circuits, and test & measurement equipment requiring stable component supply across commercial and industrial temperature ranges.
Supply support for TL7660CD 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 power management technologies, with decades of expertise in precision power conversion ICs.
The TL7660 product line was designed specifically for low-noise, low-component-count voltage inversion in space-constrained portable and industrial systems - prioritizing latch-up immunity, wide input range, and capacitor flexibility over switching frequency agility.
FAQ
What is the minimum supply voltage required for stable operation of the TL7660CD?
The TL7660CD operates stably down to 1.5 V when the LV pin is tied to GND to bypass the internal regulator. Below 3.5 V, grounding LV is mandatory; failure to do so causes latch-up. At 1.5 V, it delivers –1.5 V output with reduced current capability (~5 mA), verified per TI SCAS794 electrical characteristics tables.
Can the TL7660CD be used as a voltage doubler, and what is the maximum achievable output?
Yes, the TL7660CD can be configured as a voltage doubler. With a 10 V input and ideal diodes, it achieves up to +18.6 V output (2×VCC – 2×VF). The datasheet Figure 9 confirms this topology; practical output depends on diode forward voltage and capacitor ESR, but TL7660CD's internal switches eliminate external diode requirements in inverter mode only - doubling requires external diodes.
How does the LV pin affect TL7660CD functionality, and what happens if it is incorrectly configured?
The LV pin disables the internal series regulator when grounded (for VCC < 3.5 V), reducing dropout and enabling 1.5 V operation. If left floating at low VCC, the device fails to start; if grounded above 3.5 V, latch-up occurs due to forward-biased substrate junctions. This behavior is explicitly defined in the "APPLICATION INFORMATION" section of the TL7660CD datasheet.
What external components are mandatory for basic TL7660CD negative voltage operation?
Two external capacitors are mandatory: a 10 µF polarized electrolytic pump capacitor (C1) between CAP+ (pin 2) and CAP− (pin 4), and a 10 µF reservoir capacitor (C2) between VOUT (pin 5) and GND (pin 3). No diodes, inductors, or resistors are required - the TL7660CD integrates all active switching and control circuitry.
Is the TL7660CD RoHS compliant and suitable for modern automated PCB assembly?
Yes, TL7660CD is RoHS compliant (per TI PACKAGE OPTION ADDENDUM), features NiPdAu lead finish, and carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). Its SOIC-8 package is compatible with standard reflow profiles (peak 260°C), and TI specifies tape-and-reel packaging (2500 units/reel) optimized for SMT placement equipment.
TL7660CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
TL7660CD FAQ
1.How can I place an order for TL7660CD through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7660CD 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 TL7660CD reliable?
The price and inventory of TL7660CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7660CD is usually 5 days.
3.What payment methods are accepted for TL7660CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7660CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7660CD?
TL7660CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7660CD 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 TL7660CD?
For technical support, including TL7660CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7660CD requirements.
6.How does Aetrix verify that TL7660CD is sourced from the original manufacturer or authorized distributors?
All TL7660CD 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 TL7660CD meets industry standards.
7.What is the process for return or replacement of TL7660CD?
All TL7660CD units undergo pre-shipment inspection (PSI). If there is an issue with TL7660CD, 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 TL7660CD part is unused and in its original packaging.
Return procedure for TL7660CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL7660CD 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…
