Texas Instruments LM27762DSSR

Overview

LM27762DSSR from Texas Instruments is a dual-rail, low-noise integrated charge pump + LDO IC generating independently adjustable ±1.5V to ±5V outputs with ±250mA capability, 2MHz fixed-frequency operation, and 22µV_RMS output noise - deployed in high-fidelity audio biasing and precision data converter power supplies.

For engineers reviewing the LM27762DSSR datasheet, LM27762DSSR pinout, LM27762DSSR application, or LM27762DSSR equivalent, this page delivers verified pin functions, real-world load/line regulation performance, confirmed thermal metrics (R_θJA = 62.2°C/W), and validated alternatives for ±V_OUT rail generation in space-constrained analog systems.

Technical Context

The LM27762DSSR integrates an inverting charge pump (2MHz switching, 2.5Ω CPOUT impedance at 5V) followed by a negative LDO and a separate positive LDO - enabling independent enable control (EN+, EN–) and feedback-based voltage setting (V_FB+ = 1.20V, V_FB− = −1.22V) for precise sequencing of dual rails.

It implements undervoltage lockout (2.4V trip), thermal shutdown (150°C), current limiting (500mA typ), and open-drain PGOOD monitoring with active-low assertion when either OUT+ or OUT− falls below 95% of target - all within a 3mm × 2mm WSON-12 package with exposed thermal pad.

Key Specifications

Pinout & Package

LM27762DSSR uses a 12-pin WSON package (3mm × 2mm, 0.5mm pitch) with exposed thermal pad connected to GND for enhanced thermal dissipation (R_θJC(bot) = 9.2°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-rail charge pump + LDO applications.

Compared with MAX17572ETE+ and TPS60403DBVR, LM27762DSSR uniquely combines independent rail enable, 22µV_RMS noise, and integrated thermal/UVLO protection in a 3mm × 2mm footprint - making it the only option meeting Hi-Fi audio and precision data converter requirements without external support circuitry.

Availability

LM27762DSSR is available at Aetrix Electronics and suitable for portable audio devices, precision data acquisition systems, and wireless infrastructure equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for LM27762DSSR 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in power management ICs.

The LM27762DSSR belongs to TI's low-noise dual-rail power management product line, designed specifically for high-fidelity audio, precision data converters, and portable instrumentation demanding clean, sequenced ±V_OUT generation from single-input sources.

FAQ

What is the minimum input voltage required for stable operation of the LM27762DSSR?

The LM27762DSSR features undervoltage lockout (UVLO) that disables operation below 2.4V and re-enables at 2.6V. Stable regulation requires VIN ≥ 2.7V per datasheet specifications - for example, a 3.3V system must maintain ≥3.0V under worst-case load to avoid dropout in the positive LDO (45mV dropout at 100mA) and ensure sufficient headroom for the charge pump stage.

How does the LM27762DSSR achieve low output noise compared to standard charge pumps?

The LM27762DSSR achieves 22µV_RMS noise (10Hz–100kHz) by combining a 2MHz fixed-frequency charge pump (reducing low-frequency ripple) with post-regulation via dedicated low-noise positive and negative LDOs - unlike basic charge pumps, which lack LDO filtering and typically exhibit >100µV_RMS noise. This architecture is confirmed in Section 5.5 Electrical Characteristics of the LM27762DSSR datasheet.

Can the LM27762DSSR generate asymmetric output voltages such as +3.3V and −5V simultaneously?

Yes - the LM27762DSSR supports independent voltage setting for OUT+ and OUT− via separate resistor dividers on FB+ and FB− pins. For +3.3V, use R1/R2 to set V_FB+ = 1.20V; for −5V, use R3/R4 to set V_FB− = −1.22V. The device validates this capability in Section 7.2.2.1 and 7.2.2.3 of the LM27762DSSR datasheet, confirming full ±1.5V to ±5V adjustability per rail.

What thermal considerations apply when operating the LM27762DSSR at maximum ±250mA output current?

At ±250mA and 5.5V input, the LM27762DSSR dissipates ~1.1W. With R_θJA = 62.2°C/W, junction temperature rise exceeds 125°C in still air - triggering thermal shutdown (150°C). To sustain full load, the thermal pad must be soldered to ≥200mm² copper pour with ≥4 thermal vias to inner ground planes, as specified in Section 5.4 Thermal Information of the LM27762DSSR datasheet.

Is the PGOOD pin of the LM27762DSSR compatible with 1.8V logic systems?

Yes - the PGOOD pin is open-drain and logic-low active, so it can interface with any logic family by selecting an appropriate pullup resistor to the target supply (e.g., 10kΩ to 1.8V). The output sinks current when asserted (≤0.4V at 4mA), satisfying 1.8V logic low thresholds. This behavior is documented in Table 6-1 (PGOOD Operation) of the LM27762DSSR datasheet.