Renesas ICL7662CPA

Overview

ICL7662CPA from Intersil is a monolithic CMOS voltage converter IC that performs positive-to-negative supply conversion across +4.5V to +20.0V input, delivering complementary output voltages from –4.5V to –20V; requires only two external noncritical capacitors; achieves 99.9% typical open-circuit voltage conversion efficiency; and supports voltage doubling up to +38.6V with +20V input - used in op-amp biasing, DRAM negative rails, and µProcessor local supplies.

For engineers reviewing the ICL7662CPA datasheet, ICL7662CPA pinout, ICL7662CPA application, or ICL7662CPA equivalent, key selection considerations include its 8-pin PDIP package, LV pin configuration for low-voltage operation, oscillator frequency adjustability (10 kHz nominal), output source resistance (60–100 Ω at 20 mA), and latchup-free substrate bias control architecture.

Technical Context

The ICL7662CPA integrates an on-chip RC oscillator (10 kHz nominal at V+ = 15 V), series DC regulator, voltage level translator, and four power MOS switches (one P-channel, three N-channel) configured as a charge-pump inverter. Its logic network actively senses VOUT to dynamically bias S3/S4 substrates, preventing forward conduction and ensuring latchup-free startup and short-circuit conditions.

Operation supports dual modes: standard inverting (VOUT ≈ –V+) and voltage doubling (VOUT ≈ +2V+), with mode selection determined by external capacitor topology. The LV pin bypasses the internal regulator when tied to GND (for V+ ≤ 11 V), reducing dropout and improving efficiency below 10 V, while floating LV is required above 10 V to maintain safe substrate bias margins.

Key Specifications

Pinout & Package

ICL7662CPA uses an 8-lead plastic dual in-line package (PDIP), per ordering code E8.3. Pin 1 is a test terminal not connected in normal operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage converter applications.

Compared with ICL7662CPA, ICL7660CPA offers simpler operation at lower voltages but cannot handle >10V inputs or optimize efficiency below 10V, while MAX1044CPA adds shutdown control at the cost of losing the LV pin's low-V+ efficiency boost - making ICL7662CPA uniquely suited for wide-input, efficiency-sensitive inverting rails.

Availability

ICL7662CPA is available at Aetrix Electronics and suitable for op-amp biasing, DRAM negative rails, and µProcessor local supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and embedded programs.

Supply support for ICL7662CPA 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

Intersil Corporation is a U.S.-based semiconductor manufacturer specializing in precision analog, power management, and interface ICs, with ISO9000-certified manufacturing and global distribution.

The ICL7662 belongs to Intersil's legacy CMOS voltage converter product line, designed specifically for compact, diode-free, high-efficiency inverting and voltage-doubling applications in space-constrained analog and mixed-signal systems.

FAQ

What is the maximum input voltage rating for the ICL7662CPA?

The absolute maximum supply voltage for the ICL7662CPA is 22 V, but the recommended operational range is +4.5 V to +20.0 V. Exceeding 22 V risks permanent damage. Within the operational range, the LV pin must be grounded for inputs ≤11 V and left floating for inputs >10 V to ensure latchup-free operation - this requirement is explicitly defined in the Absolute Maximum Ratings and Electrical Specifications sections of the datasheet.

Can the ICL7662CPA generate positive voltage doubling?

Yes, the ICL7662CPA can function as a voltage doubler, generating up to +38.6 V from a +20 V input using the topology shown in Figure 22 of the datasheet. This requires external diodes D1 and D2, plus pump/reservoir capacitors C1 and C2 arranged to sum V+ and the charged C1 voltage. The output source impedance in doubler mode is approximately 70 Ω at 10 mA and +15 V input, per characterization data.

How does the LV pin affect ICL7662CPA performance?

The LV pin controls the internal series regulator: grounding LV disables it, reducing dropout and improving efficiency at low input voltages (≤11 V); leaving LV floating enables the regulator for higher inputs (>10 V) to maintain safe substrate bias margins and prevent latchup. Misconfiguring LV - e.g., grounding it at +15 V - causes destructive latchup, as confirmed in the "Do's and Don'ts" section and Absolute Maximum Ratings notes.

What is the typical output source resistance of the ICL7662CPA?

The ICL7662CPA exhibits a typical output source resistance of 60 Ω at 20 mA load, 25°C, with LV pin open and V+ = 15 V. This value increases to 70–120 Ω across the full temperature range (0°C to 70°C) and rises further at lower V+ (e.g., 125–200 Ω at V+ = 5 V, LV = GND). These values are measured and specified in the Electrical Specifications table and validated in Figure 8's load regulation curves.

Is the ICL7662CPA pin-compatible with other members of the ICL766x family?

Yes, the ICL7662CPA is pin-compatible with the ICL7660CPA in the 8-pin PDIP package - same V+, GND, CAP+, CAP−, VOUT, OSC, and TEST pin assignments. However, the ICL7662CPA adds the LV pin (pin 6), which is unconnected (NC) on the ICL7660CPA. This allows direct PCB reuse when upgrading from ICL7660CPA to ICL7662CPA, provided the LV trace is routed to ground or left floating as needed.