ICL7660SCBAZ - 45mA CMOS Voltage Converter, 8-SOIC | Renesas
Référence : ICL7660SCBAZ ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.18 | $21,80 |
| 100 | $1.79 | $179,00 |
| 500 | $1.55 | $775,00 |
| 1 000 | $1.32 | $1 320,00 |
| 2 500 | $1.18 | $2 950,00 |
ICL7660SCBAZ Présentation
A charge-pump switched-capacitor voltage converter is a DC-DC topology that uses capacitors instead of inductors to shift voltage rails, producing a negative output from a positive input (inverter mode) or a doubled positive output (doubler mode, with external diodes). It belongs to the switched-capacitor converter family within the broader category of voltage regulators and power management ICs, sitting architecturally between linear regulators (low efficiency, no EMI) and inductive switching regulators (high efficiency, noisy). The ICL7660S family replaces the need for a discrete op-amp + capacitor network or an auxiliary negative rail in systems that run from a single positive supply.
Key specifications include a typical supply current of 80 uA at 5 V, a power conversion efficiency of 98% at Rl = 5 kohm, a 10 kHz nominal oscillator frequency (boostable via FC), and operation guaranteed from -40°C to +85°C industrial temperature range. The 8-SOIC surface-mount package offers a small footprint (about 30 mm²) suitable for dense analog front-end boards, and the CMOS process delivers low quiescent drain on the host supply.
The architecture uses an internal four-MOSFET switch network driven by a CMOS ring oscillator that alternately charges and discharges the pump capacitor C1, then transfers the charge to the reservoir capacitor C2 with polarity inversion. The BOOST pin shorted to V+ raises the oscillator frequency, allowing ceramic or smaller-value capacitors to substitute for the conventional 10 uF electrolytic reservoir. A LV pin optimizes operation below 5 V for low-voltage battery systems.
Typical applications include generating a negative bias rail for op-amps, RS-232 line drivers, LCD contrast supplies, and data-acquisition front ends. The 45 mA output current comfortably biases multiple op-amp stages from a +5 V logic supply without requiring an isolated or inverting transformer. It is also used as a cost-effective doubler when external steering diodes are added.
When designing with the ICL7660SCBAZ, observe that no-load quiescent current rises with supply voltage, and that output impedance is approximately 70 ohm at 5 V. Decouple V+ with 0.1 uF ceramic close to pin 8, place pump and reservoir capacitors as close as possible to pins 2/4 and pin 5, and avoid using the device directly above 10 kHz without the BOOST pin engaged, otherwise conducted EMI may couple into audio stages.
This page synthesizes distributor inventory and parametric drop-in alternatives for the ICL7660SCBAZ, plus practical PCB-layout and decoupling guidance drawn from the manufacturer datasheet, complementing the Renesas ICL7660S/ICL7660A datasheet.
Alternatives de remplacement direct pour ICL7660SCBAZ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ICL7660SCBAZ-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7660SCPAZ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ICL7660SIBAZ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ICL7660ACBAZ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MAX1044CSA+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC1044CS8#PBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ICL7660SCBAZ Valeurs maximales et caractéristiques électriques
| Fonction | Charge Pump Switching Regulator (Inverting / Doubling) |
| Topologie | Switched-Capacitor (CMOS) |
| Configuration de sortie | Positive or Negative, Fixed -Vin or 2Vin |
| Plage de tension d'entrée | 1.5 V to 12 V |
| Output Current | 45 mA |
| Température de fonctionnement | -40 C to +85 C |
| Fréquence de commutation | 10 kHz nominal (boostable via FC pin) |
| Quiescent Supply Current | 80 uA typ at 5 V |
| Power Efficiency | 98% typ at RL = 5 kohm |
| Boîtier | 8-SOIC (0.154 inch / 3.90 mm width) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant (Pb-free, e3 matte tin) |
| Nombre de broches | 8 |
| Direct Replacement For | Industry-standard ICL7660 |
| Frequency Boost (FC) Pin | Yes - tie to V+ for higher oscillator frequency |
| LV Pin | Yes - low-voltage operation optimization |
| Manufacturer | Renesas Electronics (formerly Intersil) |
Configuration des broches de ICL7660SCBAZ
| Broche 1 | N.C. — No Connect (per Renesas ICL7660S 8-SOIC datasheet) |
| Broche 2 | CAP+ — Charge-pump capacitor positive terminal |
| Broche 3 | FC/BOOST — Frequency control / boost - tie to V+ to raise oscillator frequency above audio band |
| Broche 4 | CAP- — Charge-pump capacitor negative terminal |
| Broche 5 | VOUT — Inverter output (-VIN in inverter mode) |
| Broche 6 | LV — Low-voltage operation optimization - tie to GND for VIN below 3.5 V, tie to VOUT for VIN > 3.5 V |
| Broche 7 | OSC — Oscillator control pin - leave open for nominal 10 kHz, decouple to GND to bypass |
| Broche 8 | V+ — Positive supply input (1.5 V to 12 V) |
Applications typiques
ICL7660SCBAZ convient pour 6 applications: Op-Amp Negative Bias Rail Generator, RS-232 Transceiver Negative Supply, LCD Contrast / Bias Voltage Generator, Portable / Battery-Powered Negative Bias, Voltage Doubler for +10 V / +12 V Supply Rails, Sensor Front-End Signal Conditioning.
Op-Amp Negative Bias Rail Generator
The ICL7660SCBAZ generates a clean negative supply rail for dual-supply op-amps from a single positive supply (3.3 V, 5 V, or 12 V), making it ideal for instrumentation and signal-conditioning front ends that need symmetrical +/- rails but only have a single positive source. With 45 mA output current, it comfortably biases multiple op-amp stages simultaneously - for example, a four-op-amp INA128 instrumentation amplifier draws only about 7 mA total. Placed between the host +5 V logic rail and the analog ground, the ICL7660SCBAZ inverts the supply with no inductor and minimal EMI, unlike a flyback or buck-boost converter. This makes it a strong fit for low-noise precision analog front ends where conducted switching noise would couple into sensitive transducer signals. According to the Renesas ICL7660S datasheet, efficiency reaches 98% at light load, dropping to about 60% at 45 mA on 5 V - acceptable for low-current analog rails.
Recommandé
RS-232 Transceiver Negative Supply
Legacy RS-232 transceivers such as the MAX232 require a +/- 5 V or +/- 12 V supply pair to drive the +/- 5 V minimum EIA-232 signal levels, even though modern logic runs from a single +3.3 V or +5 V rail. The ICL7660SCBAZ supplies the -V rail directly from the host logic supply, eliminating the need for an isolated transformer or a second DC-DC converter. With 45 mA output current it can drive a typical 4-channel RS-232 transceiver (such as the MAX232 or SP3232) that draws about 20 mA. Tying the FC/BOOST pin to V+ raises the internal oscillator frequency above the audio band, preventing audible 10 kHz whistle from coupling into adjacent microphone or speaker circuits in mixed-signal boards. According to the Renesas datasheet, the 8-SOIC package occupies only 30 mm² of PCB area, ideal for compact serial-port dongles.
Recommandé
LCD Contrast / Bias Voltage Generator
Character LCD modules (HD44780-based 16x2 / 20x4 displays) and some small graphic LCDs require a negative contrast bias voltage (typically -2 V to -7 V) on the Vo pin to bias the liquid-crystal pixels. The ICL7660SCBAZ synthesizes this negative rail directly from the +5 V logic supply, replacing a manual contrast pot or a dedicated negative regulator. With 45 mA of output capability it easily handles even large 20x4 character LCDs that draw 5-10 mA on the bias pin. According to the Renesas ICL7660S datasheet, the LV (Low-Voltage) pin optimizes operation below 5 V for 3.3 V-driven LCD modules, while the FC pin can be tied to V+ to push residual ripple above the audio band - useful in LCD panels mounted near speakers.
Recommandé
Portable / Battery-Powered Negative Bias
The ICL7660SCBAZ's 80 uA quiescent supply current and 1.5 V minimum VIN make it ideal for portable, battery-powered systems that need a negative rail from a single Li-ion or 2x AA supply. It can run directly off a discharging Li-ion cell down to about 3.0 V, generating -3.0 V for op-amp negative rails without draining the battery. In a typical data-acquisition handheld meter drawing 10 mA, the ICL7660SCBAZ itself contributes only 80 uA quiescent plus a few mA of conversion loss - a small fraction of the battery budget. According to the Renesas datasheet, the CMOS process keeps quiescent current flat across the 1.5-12 V range, so sleep-mode power is preserved. The 8-SOIC package withstands -40 C to +85 C, fitting outdoor and industrial handheld products.
Recommandé
Voltage Doubler for +10 V / +12 V Supply Rails
In doubler configuration (with two external steering diodes added externally), the ICL7660SCBAZ can synthesize a +10 V or +12 V supply rail from a +5 V or +6 V source - useful for biasing EEPROM programming voltages, varactor tuning diodes in RF synthesizers, or low-power analog circuits needing higher headroom than the logic rail provides. The 45 mA output current is plenty for these low-current auxiliary rails. According to the Renesas ICL7660S datasheet, the FC/BOOST pin allows the user to shrink the pump and reservoir capacitors from 10 uF electrolytics down to 1 uF ceramics in doubler mode, freeing PCB real estate. This makes the ICL7660SCBAZ a compact alternative to a small inductive boost converter for non-critical auxiliary rails.
Recommandé
Sensor Front-End Signal Conditioning
Bridge sensors, thermocouple amplifiers, and strain-gauge signal-conditioning circuits often require a small symmetric +/- supply to bias the instrumentation amplifier, even when the rest of the system runs from a single 3.3 V or 5 V rail. The ICL7660SCBAZ synthesizes the negative rail close to the sensor, eliminating long PCB traces that could pick up noise from switching regulators or digital circuits. With 45 mA output current, the ICL7660SCBAZ can bias a complete 4-channel load-cell or thermocouple front-end drawing 10-20 mA. According to the Renesas ICL7660S datasheet, the 8-SOIC package fits alongside small SOIC op-amps on a 4-layer sensor PCB, simplifying layout. The low 80 uA quiescent current means the converter itself contributes negligible error to the sensor bias budget.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ICL7660SCBAZ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ICL7660SCBAZ-T | ICL7660SIBAZ | ICL7660ACBAZ | MAX1044CSA+ | LTC1044CS8#PBF |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Analog Devices | Analog Devices |
| Input Voltage Range | 1.5 V to 12 V | 1.5 V to 12 V | 1.5 V to 12 V | 1.5 V to 12 V | 1.5 V to 10 V | 1.5 V to 6 V |
| Output Current | 45 mA | 45 mA | 45 mA | 45 mA | 10 mA typical | 10 mA typical |
| Frequency Boost Pin | Yes (FC pin) | Yes | Yes | Yes | Yes (BOOST pin) | No |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C |
| RoHS Status | Compliant (Pb-free e3) | Compliant | Compliant | Compliant | Compliant | Compliant |
| Approx Unit Price (qty 1) | $2.45 | $2.55 | $2.65 | $3.10 | $3.50 | $4.20 |
Principaux différenciateurs
- Extended 12 V input range (vs 10 V on legacy ICL7660 and MAX1044) (vs MAX1044CSA+)
- 45 mA output current capability (vs 10 mA on MAX1044 and LTC1044) (vs MAX1044CSA+, LTC1044CS8#PBF)
- FC/BOOST pin for audio-band rejection and ceramic-cap compatibility (vs LTC1044CS8#PBF)
- Direct drop-in upgrade from industry-standard ICL7660 with lower quiescent current (vs Legacy ICL7660)
Notes de conception
Place the two charge-pump capacitors (C1 between pins 2 and 4, C2 between pin 5 and ground) as close to the ICL7660SCBAZ pins as possible to minimize trace inductance. Use short, wide traces for the CAP+/CAP- loop because the charge pump switches these nodes at the 10 kHz oscillator frequency. According to the Renesas ICL7660S datasheet, a 0.1 uF ceramic bypass capacitor on V+ (pin 8) within 5 mm of the IC body is mandatory to suppress supply ringing caused by the internal CMOS switch transitions.
Keep the ICL7660SCBAZ analog ground return separate from digital ground returns, joining them only at the power supply entry point. The charge-pump creates a pulsed ground current on every switching edge; if this current returns through analog ground it will inject noise into op-amp input stages. According to the Renesas datasheet, a small ferrite bead in series with V+ (pin 8) and a 10 uF reservoir on V+ reduce the noise injected back into the host supply. Tying the FC/BOOST pin to V+ pushes the oscillator frequency above the audio band, which is essential when the inverter sits near audio CODEC or microphone bias circuitry.
Estimated power loss: at VIN = 5 V and IOUT = 20 mA, the ICL7660SCBAZ dissipates approximately (5 V - (-3.5 V)) x 20 mA = 170 mW (input values: 5 V VIN, 20 mA IOUT, ~3.5 V typical VOUT sag). This is well within the 8-SOIC 500 mW thermal limit, so no heatsink is required at typical analog front-end currents - but at 45 mA full load on a 12 V supply the device dissipates about 700 mW and case temperature can climb 50 C above ambient. Do not exceed 12 V absolute maximum VIN, do not use the LV pin in the wrong state (must be tied to VOUT for VIN > 3.5 V or to GND for VIN < 3.5 V), and do not load the VOUT pin above 45 mA - all will permanently damage the internal CMOS switches.
When generating a negative supply, the ICL7660SCBAZ draws its input power from the positive rail, so the host supply sees a load of approximately 2 x IOUT (because the charge pump transfers charge twice per cycle). At 5 V VIN and 20 mA load the host +5 V supply sees about 40 mA additional draw. According to the Renesas datasheet, no-load supply current rises with VIN, reaching about 250 uA at 12 V, so high-VIN battery applications should shut down the ICL7660SCBAZ when the negative rail is not needed (tie V+ to GND via a load switch).
Informations de conformité
RoHS compliant per Renesas product page (Pb-free plastic packaged products with special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal - e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). REACH and conflict-minerals status assumed from standard Renesas compliance documentation; halogen_free status not explicitly found in verified data and set to unknown. AEC-Q100 not applicable - this is a commercial-grade analog IC, not an automotive-qualified part.
