Analog Devices Inc. LTC1472CS#PBF

Overview

LTC1472CS#PBF from Analog Devices (formerly Linear Technology) is a protected PCMCIA VCC and VPP switching matrix IC that routes power to card socket supply pins. It delivers programmable VCC output (OFF/3.3V/5V, 1A max) and VPP output (0V/VCC/12V/Hi-Z, 120mA max), with integrated SafeSlot™ current limiting and thermal shutdown. It enables direct interface with industry-standard PCMCIA controllers in notebook and palmtop computers.

For engineers reviewing the LTC1472CS#PBF datasheet, LTC1472CS#PBF pinout, LTC1472CS#PBF application, or LTC1472CS#PBF equivalent, key selection criteria include dual-output voltage state control, guaranteed 1A/120mA drive capability, break-before-make switching, <1µA standby current, and 16-pin SOIC package compatibility with legacy PCMCIA power management designs.

Technical Context

The LTC1472CS#PBF integrates two independent switching sections: a VCC section using charge-pumped NMOS switches (0.12Ω @ 3.3V, 0.14Ω @ 5V) and a VPP section supporting four output states via dual NMOS paths (VPPIN→VPPOUT, VCC(IN)→VPPOUT, GND→VPPOUT). Both sections feature TTL-to-CMOS input converters with ≈100mV hysteresis and XOR logic to prevent simultaneous 3.3V/5V activation.

It employs on-chip charge pumps powered from 5VIN (VCC section) and VDD (VPP section) to generate gate drive voltages-eliminating need for continuous external 12V supply. Output transitions use controlled rise/fall times (e.g., 400µs VCC rise, 10–100µs VPP transitions) and built-in break-before-make timing to prevent shoot-through during state changes.

Key Specifications

Pinout & Package

The LTC1472CS#PBF is housed in a 16-pin narrow-body plastic SOIC package (S package), with θ_JA = 100°C/W and T_JMAX = 100°C. Pin assignments are validated per Linear Technology's official datasheet (1472fa) and match the top-view layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCMCIA power switching applications.

Compared with LTC1471CS#PBF and LTC1315CG#PBF, the LTC1472CS#PBF uniquely combines single-slot VCC/VPP switching, 16-pin SOIC compatibility, and full SafeSlot™ protection in one device - making it the optimal choice for cost-sensitive, space-constrained PCMCIA designs requiring complete power management.

Availability

LTC1472CS#PBF is available at Aetrix Electronics and suitable for notebook computers, palmtop devices, OpenCable set-top boxes, and industrial bar-code readers requiring stable component supply and long-term obsolescence management.

Supply support for LTC1472CS#PBF 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

Analog Devices acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear products including the LTC1472 series.

The LTC1472 belongs to Linear Technology's PCMCIA power management product line, designed specifically to simplify compliant, robust, and low-power PCMCIA socket implementation in portable and embedded systems.

FAQ

What is the maximum output current capability of the LTC1472CS#PBF on its VCC and VPP outputs?

The LTC1472CS#PBF guarantees 1A continuous current on the VCC(OUT) pin across both 3.3V and 5V output states, and 120mA on the VPPOUT pin when configured for 12V output. These ratings are supported by SafeSlot™ foldback current limiting and thermal shutdown circuits that activate under overload or short-circuit conditions to protect the LTC1472CS#PBF and connected components.

Does the LTC1472CS#PBF require a continuous 12V supply to operate?

No - the LTC1472CS#PBF does not require continuous 12V power. Its internal charge pumps generate necessary gate drive voltages from the 5VIN and VDD supplies. The 12V supply (VPPIN) is needed only when VPPOUT is programmed to 12V; the SHDN pin then signals the external 12V regulator to activate only during that brief period, reducing overall system power consumption.

How does the LTC1472CS#PBF interface with standard PCMCIA controllers like the CL-PD6710?

The LTC1472CS#PBF interfaces directly with the CL-PD6710 using its VCC EN0/VCC EN1 and VPP EN0/VPP EN1 inputs, which accept standard TTL/CMOS logic levels. Its built-in XOR logic accommodates active-low VCC control (CL-PD6710), while break-before-make timing and controlled slew rates eliminate need for external glue logic or timing compensation circuits in the LTC1472CS#PBF design.

What protection mechanisms are implemented in the LTC1472CS#PBF for short-circuit events?

The LTC1472CS#PBF implements dual-layer protection per output: SafeSlot™ foldback current limiting reduces short-circuit current to ~1A (VCC) or ~100mA (VPP) depending on output voltage, and independent thermal shutdown disables the affected switch if junction temperature exceeds safe limits. These features are fully integrated and require no external components to function in the LTC1472CS#PBF.

Can the LTC1472CS#PBF drive large output capacitors without causing supply glitches?

Yes - the LTC1472CS#PBF is specifically designed to drive up to 150µF on VCC(OUT) with controlled 400µs rise time, preventing voltage spikes on the 5VIN or 3VIN supplies. VPPOUT supports smaller capacitors (0.01–0.1µF) with µs-scale transitions. This capability ensures compliance with PCMCIA hot-swap specifications and eliminates need for external inrush limiters in the LTC1472CS#PBF application.