Analog Devices Inc. LT1302CS8-5#PBF

Overview

LT1302CS8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V micropower step-up DC/DC converter with integrated 2A NPN switch, operating from 2V–8V input and delivering up to 600mA at 5.05V in Burst Mode. It features 200µA quiescent current, logic-controlled shutdown (15µA), and low 310mV typical switch saturation voltage. Designed for battery-powered portable electronics requiring high efficiency across light-to-heavy loads.

For engineers reviewing the LT1302CS8-5#PBF datasheet, LT1302CS8-5#PBF pinout, LT1302CS8-5#PBF application, or LT1302CS8-5#PBF equivalent, key selection criteria include input voltage range (2V min), output accuracy (±2.5% over temp), thermal performance in SO-8 package (θ_JA = 80°C/W), and Burst Mode vs. current mode behavior under varying load conditions.

Technical Context

The LT1302CS8-5#PBF employs dual-mode control: hysteretic Burst Mode operation at light loads (enabling 200µA IQ) and current-mode regulation at heavier loads (ensuring stable transient response). Its internal NPN switch supports up to 2.8A peak current and switches at 175–265kHz (variable frequency).

It integrates fixed 5V feedback network (420kΩ internal sense resistor), eliminating external resistors. The VC pin enables frequency compensation via external RC network, while SHDN pin provides TTL/CMOS-compatible shutdown with 1.8V high threshold and 0.5V low threshold.

Key Specifications

Pinout & Package

LT1302CS8-5#PBF is housed in an 8-lead plastic SO (S8) package, thermally enhanced with pins 1 (GND) and 8 (PGND) internally connected and serving as primary heat paths. Package outline conforms to JEDEC MS-012AC, 3.9mm × 4.9mm body, 1.75mm max height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-up DC/DC converter applications.

Compared with TPS61200DRCT and MAX756CSA+, the LT1302CS8-5#PBF delivers higher output current (600mA vs. 300–1200mA), superior light-load efficiency via Burst Mode, and simpler fixed-output implementation - making it optimal for compact, battery-critical 5V applications where layout space and bill-of-materials count matter.

Availability

LT1302CS8-5#PBF is available at Aetrix Electronics and suitable for portable medical devices, handheld test equipment, industrial data loggers, and notebook peripheral interfaces requiring stable component supply with long-term manufacturability.

Supply support for LT1302CS8-5#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 its high-performance analog and power management portfolio with rigorous reliability standards and long-term product support.

The LT1302CS8-5#PBF belongs to Linear's micropower DC/DC converter family, engineered specifically for battery-operated portable electronics demanding high efficiency across wide load ranges and minimal external components.

FAQ

What is the minimum input voltage required for LT1302CS8-5#PBF to start switching?

The LT1302CS8-5#PBF begins switching at an input voltage as low as 2.0V, verified across temperature and process corners. This enables reliable operation from nearly depleted two-cell alkaline or NiMH batteries. Below 2.0V, the internal bias circuit cannot sustain oscillator operation, and the device remains in undervoltage lockout. Startup behavior is consistent across all S8-package variants of the LT1302-5 series.

Does LT1302CS8-5#PBF require external feedback resistors to set the 5V output?

No, the LT1302CS8-5#PBF integrates a precise 420kΩ internal resistor connected to the SENSE pin, forming a fixed 5.05V output divider. No external resistors are needed - unlike the adjustable LT1302 version. This simplifies layout, improves accuracy over temperature, and eliminates resistor tolerance errors that would otherwise affect output regulation.

How does the IT pin affect LT1302CS8-5#PBF operation, and what happens if it's left unconnected?

When the IT pin is left floating, the LT1302CS8-5#PBF operates in default Burst Mode at light loads, minimizing quiescent current to 200µA. Connecting a 3.3kΩ resistor from IT to GND forces continuous current-mode operation, eliminating low-frequency output ripple (e.g., 6kHz burst tone) - beneficial in audio-sensitive applications. Leaving IT unconnected is the recommended configuration for maximum battery life.

What is the maximum achievable output current from LT1302CS8-5#PBF at 5V with a 2.5V input?

At VIN = 2.5V and VOUT = 5V, the LT1302CS8-5#PBF delivers up to 600mA continuously, as confirmed in Figure 1 and Typical Performance Characteristics (TA02). This assumes proper layout, 10µH inductor (e.g., Coilcraft DO3316-103), low-ESR output capacitors, and adequate PCB copper for thermal dissipation. Derating applies above 70°C ambient or with reduced copper area.

Can LT1302CS8-5#PBF be used in a SEPIC or inverting topology?

No, the LT1302CS8-5#PBF is designed exclusively for boost (step-up) topology with its internal NPN switch and grounded emitter configuration. It lacks the control architecture or pinout for SEPIC, inverting, or buck-boost operation. Attempting alternate topologies will result in improper regulation or device damage. For inverting applications, consider dedicated inverters like the LT1054 or MAX680.