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Renesas ICL7660CBAZ-T
- Part No.:
- ICL7660CBAZ-T
- Manufacturer:
- Renesas
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7660CBAZ-T.pdf
- Description:
- IC REG CHARG PUMP INV 45MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:27,048
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Product details
Overview
ICL7660CBAZ-T from Intersil (now Renesas) is a monolithic CMOS charge-pump voltage converter IC that generates regulated negative output voltages from a single positive input supply. It operates across 1.5V–12V input, delivers complementary -1.5V to -12V output, achieves ≥96% power efficiency at 5kΩ load, supports 10kHz nominal oscillator frequency, and features a BOOST pin (Pin 1) to raise switching frequency for lower output impedance-enabling compact 0.1µF external capacitors in RS-232 or instrumentation power supplies.
For engineers reviewing the ICL7660CBAZ-T datasheet, ICL7660CBAZ-T pinout, ICL7660CBAZ-T application, or ICL7660CBAZ-T equivalent, this device is selected for low-quiescent-current negative rail generation where board space, capacitor size, and latchup immunity are critical-especially in data acquisition systems, dual-supply op-amp biasing, and legacy RS-232 interface circuits requiring ±5V from +5V.
Technical Context
The ICL7660CBAZ-T integrates an internal RC oscillator, voltage level translator, series DC regulator, and four MOS power switches (one P-channel, three N-channel) to implement a two-phase switched-capacitor voltage inversion topology. Its substrate bias logic network actively monitors VOUT to dynamically adjust switch body diode biasing, eliminating latchup under start-up and short-circuit conditions without requiring external Schottky diodes across CAP−–VOUT in most configurations.
Operation is configurable via the LV pin: tied to GND for enhanced low-voltage operation below 3.5V input, left floating above 3.5V to maintain latchup protection; and the BOOST pin enables 3.5× oscillator frequency scaling (e.g., 10kHz → ~35kHz), directly reducing output source resistance and ripple when paired with smaller pump/reservoir capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - supports direct conversion from common logic rails (3.3V, 5V) and battery sources without pre-regulation. |
| Output Voltage | -1.5V to -12V - complementary inverted output with no polarity reversal required in circuit layout. |
| Supply Current | 26µA typ. at 3V, 80µA typ. at 5V - enables ultra-low-power operation in battery-backed instrumentation. |
| Oscillator Frequency | 5–10kHz (free-running), up to ~35kHz with BOOST pin - higher frequency reduces output impedance and allows smaller external capacitors. |
| Power Efficiency | ≥96% at 5kΩ load - minimizes thermal rise and input current draw in space-constrained designs. |
| Output Source Resistance | 60Ω typ. at 20mA, 5V - defines maximum load regulation error and ripple under dynamic current steps. |
| Voltage Conversion Efficiency | 99% open-circuit - ensures minimal voltage droop at light loads typical in sensor front-ends and reference buffers. |
Pinout & Package
ICL7660CBAZ-T is housed in an 8-lead SOIC package (M8.15 drawing), RoHS-compliant, Pb-free, with 1.27mm lead pitch and standard JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator boost control | Connect to V+ to increase internal oscillator frequency ~3.5×, lowering output impedance and enabling use of 0.1µF external capacitors. |
| 2 (CAP+) | Charge pump capacitor connection | Node where external pump capacitor (C1) connects; alternately charged/discharged to transfer energy to CAP−/VOUT path. |
| 3 (GND) | Ground reference | Primary return path for internal regulator, oscillator, and switch logic; must be low-impedance for stable inversion. |
| 4 (CAP−) | Charge reservoir capacitor connection | Node where reservoir capacitor (C2) connects; stores inverted charge and supplies steady negative output current. |
| 5 (VOUT) | Negative output terminal | Delivers regulated inverted voltage; must not exceed GND potential to prevent latchup-requires clamping diode if load can pull up. |
| 6 (OSC) | Oscillator timing node | Accepts external capacitor to reduce frequency (e.g., 100pF → 1kHz) or external clock (via 1kΩ series resistor) for precise synchronization. |
| 7 (LV) | Low-voltage mode enable | Tie to GND for <3.5V operation to bypass internal regulator; leave floating for >3.5V to prevent latchup via substrate bias control. |
| 8 (V+) | Positive input supply | Primary power input; accepts 1.5–12V; internal regulator derives bias for logic and switches-critical for latchup immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Boost pin (Pin 1) | Enables 3.5× oscillator frequency scaling to reduce output impedance by ~60%, permitting 0.1µF external capacitors instead of 10µF in space-sensitive designs. |
| Latchup-immune substrate bias logic | Monitors VOUT in real time to dynamically adjust MOS switch body diode biasing-eliminates need for external Schottky diode in most applications. |
| Wide 1.5V–12V input range | Supports direct operation from single-cell Li-ion (3.0V), 3.3V logic, 5V USB, and 9–12V industrial rails without external regulators or level shifters. |
| 99% open-circuit voltage conversion efficiency | Minimizes no-load voltage droop in high-impedance sensor biasing and reference circuits where output stability at microamp loads is critical. |
| Pb-free SOIC packaging | RoHS-compliant M8.15 SOIC-8 footprint compatible with standard reflow profiles and automated assembly, including wave solder for through-hole variants. |
Applications
| RS-232 Interface Power | Data Acquisition System Bias |
|---|---|
Use Scenario: Generating ±5V or ±12V from a single +5V microcontroller supply to drive RS-232 transceivers (e.g., MAX232 replacement). IC Role / Device Role / Timing Role: Negative voltage generator providing isolated inverted rail; no timing-critical dependencies beyond oscillator stability. Use Value: Eliminates need for discrete charge-pump ICs or transformers; achieves <100mV ripple at 10mA load using 10µF electrolytics and BOOST pin. | Use Scenario: Supplying dual-rail op-amps and ADC reference buffers in portable data loggers powered by 3.7V Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent-current negative rail generator; LV pin tied to GND enables stable -3.3V output from 3.3V input. Use Value: Draws only 26µA supply current at 3V, extending battery life while maintaining 99% open-circuit efficiency for precision analog front-ends. |
| Instrumentation Signal Conditioning | Op-Amp Dual-Supply Splitter |
Use Scenario: Providing clean, low-noise -5V bias for JFET-input op-amps and programmable gain amplifiers in medical ECG front-ends. IC Role / Device Role / Timing Role: High-efficiency inverted supply with minimal EMI; BOOST pin used to shift oscillator away from sensitive signal bands (e.g., 35kHz avoids 10kHz–20kHz audio band). Use Value: Achieves ≤50mVpp ripple at 5mA load with low-ESR tantalum capacitors-critical for sub-μV-level signal integrity. | Use Scenario: Converting a single +15V supply into symmetrical ±7.5V rails for rail-to-rail op-amps in test equipment power supplies. IC Role / Device Role / Timing Role: Voltage splitter using bidirectional charge-pump topology; requires matched C1/C2 and LV pin floating for >3.5V operation. Use Value: Delivers balanced ±7.5V outputs with <250Ω source impedance-enables >20mA total load current without external regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CSA+ | Higher quiescent current (120µA typ.), fixed 10kHz oscillator, no BOOST pin, requires external diode for latchup protection below 4.5V. | Better noise performance at high frequencies but less flexible capacitor sizing; unsuitable for <2V input or ultra-low-power designs. | Select MAX1044CSA+ only when EMI filtering is prioritized over board area and efficiency. |
| TC7660CPA | Lower max input voltage (10V), 100µA supply current at 5V, no LV pin control, unregulated oscillator (±30% tolerance). | Limited to 5V/3.3V systems; cannot support 9–12V industrial inputs or low-voltage battery operation. | Choose TC7660CPA only for cost-sensitive, non-critical 5V-only applications where latchup risk is mitigated externally. |
Compared with MAX1044CSA+ and TC7660CPA, the ICL7660CBAZ-T offers superior low-voltage operation (1.5V min), integrated latchup protection without external diodes, and BOOST-pin flexibility for capacitor optimization-making it the preferred choice for space-constrained, battery-powered, or wide-input industrial designs.
Availability
ICL7660CBAZ-T is available at Aetrix Electronics and suitable for RS-232 interface power, data acquisition system bias, and instrumentation signal conditioning requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for ICL7660CBAZ-T 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
Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The ICL7660 family was designed specifically for compact, efficient, and latchup-immune charge-pump voltage conversion in space- and power-constrained analog systems-targeting instrumentation, portable medical devices, and legacy interface power.
FAQ
What is the minimum input voltage supported by the ICL7660CBAZ-T?
The ICL7660CBAZ-T supports a minimum input voltage of 1.5V when the LV pin is tied to GND. This configuration bypasses the internal series regulator to enable reliable negative voltage generation from low-voltage sources such as single-cell alkaline or lithium batteries. At 1.5V input, the device delivers approximately -1.5V output with verified functionality across the full 0°C to +70°C operating range per datasheet characterization.
Does the ICL7660CBAZ-T require an external Schottky diode for latchup protection?
No, the ICL7660CBAZ-T does not require an external Schottky diode for latchup protection under normal operating conditions. Its integrated substrate bias logic network actively monitors VOUT and adjusts MOS switch body diode biasing in real time. An external Schottky diode from VOUT to CAP− is only recommended when the input voltage exceeds 5V and has a rise rate greater than 2V/µs, per the "Do's and Don'ts" section of the FN3179 datasheet.
How does the BOOST pin on the ICL7660CBAZ-T affect output performance?
The BOOST pin (Pin 1) on the ICL7660CBAZ-T increases the internal oscillator frequency by approximately 3.5× when connected to V+. This raises the charge-pump switching frequency-e.g., from 10kHz to ~35kHz-reducing output source resistance and ripple. As a result, smaller external capacitors (e.g., 0.1µF instead of 10µF) can be used while maintaining equivalent output current capability and regulation, which is especially valuable in surface-mount and space-constrained designs.
Can the ICL7660CBAZ-T be used to generate positive voltage doubling?
Yes, the ICL7660CBAZ-T can be configured as a positive voltage doubler using the circuit shown in Figure 18 of the FN3179 datasheet. In this configuration, the internal switches charge C1 to V+ − VF, then transfer charge to C2 through an external diode, yielding VOUT ≈ 2V+ − 2VF. With a 5V input, this produces approximately +9.2V output at 10mA load, with source impedance around 60Ω-suitable for low-current auxiliary rails in mixed-signal systems.
What is the function of the LV pin on the ICL7660CBAZ-T?
The LV pin on the ICL7660CBAZ-T controls operation of the internal series regulator. When tied to GND, the regulator is bypassed to improve efficiency and enable stable operation down to 1.5V input-ideal for battery-powered systems. When left floating, the regulator remains active and provides latchup protection for inputs above 3.5V. Connecting LV to GND for V+ > 3.5V violates absolute maximum ratings and may cause permanent device damage.
ICL7660CBAZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- 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:
- 45mA
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7660CBAZ-T FAQ
1.How can I place an order for ICL7660CBAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7660CBAZ-T 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 ICL7660CBAZ-T reliable?
The price and inventory of ICL7660CBAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7660CBAZ-T is usually 5 days.
3.What payment methods are accepted for ICL7660CBAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7660CBAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7660CBAZ-T?
ICL7660CBAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7660CBAZ-T 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 ICL7660CBAZ-T?
For technical support, including ICL7660CBAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7660CBAZ-T requirements.
6.How does Aetrix verify that ICL7660CBAZ-T is sourced from the original manufacturer or authorized distributors?
All ICL7660CBAZ-T 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 ICL7660CBAZ-T meets industry standards.
7.What is the process for return or replacement of ICL7660CBAZ-T?
All ICL7660CBAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7660CBAZ-T, 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 ICL7660CBAZ-T part is unused and in its original packaging.
Return procedure for ICL7660CBAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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