Texas Instruments LM5157EVM-BST

Overview

LM5157EVM-BST from Texas Instruments is an evaluation module designed to demonstrate the LM5157 wide-input non-synchronous boost converter IC with dual random spread spectrum. It delivers a tightly regulated 12 V output at up to 1.6 A from 3–9 V input, operates at 2.1 MHz, and supports configurable BIAS sourcing, external clock sync, and programmable hiccup-mode overcurrent protection.

For engineers reviewing the LM5157EVM-BST datasheet, LM5157EVM-BST test setup, LM5157EVM-BST application schematic, or LM5157EVM-BST design files, this module enables rapid validation of high-efficiency boost conversion in automotive, industrial, and portable power applications where EMI reduction and wide VIN operation are critical.

Technical Context

The LM5157EVM-BST implements the LM5157QRTERQ1 (WQFN-16) controller in a fully assembled, tested PCB layout optimized for thermal performance and low-noise measurement. It supports four BIAS configuration modes (VIN, VOUT, VCC, or VAUX), selectable spread spectrum and hiccup-mode via J11 jumper, and PGOOD monitoring with flexible pullup sourcing.

Test results confirm stable 12 V ±1% regulation across 0.3–1.6 A load and 3–9 V input, >92% peak efficiency at 6 V/1.6 A, and robust thermal behavior without forced air cooling - validated under multiple bias conditions and transient loads per TI SNVU739A User's Guide.

Key Specifications

Availability

LM5157EVM-BST is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor node boost converters, and portable medical device battery boost stages requiring stable component supply, full design validation support, and TI-qualified reference hardware.

Supply support for LM5157EVM-BST 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 delivering analog, embedded processing, and power management solutions with deep expertise in power conversion and system-level reference design.

The LM5157EVM-BST belongs to TI's high-voltage DC/DC evaluation module product line, engineered to accelerate development of wide-input, spread-spectrum-enabled boost converters for noise-sensitive and space-constrained applications.

FAQ

What is the primary function of the LM5157EVM-BST?

The LM5157EVM-BST is an evaluation module that demonstrates the LM5157QRTERQ1 boost controller IC. It provides a ready-to-test platform for validating 12 V output generation from 3–9 V input, featuring dual random spread spectrum, configurable BIAS options, and comprehensive test points for efficiency, thermal, and transient analysis - all documented in TI's SNVU739A User's Guide.

Does the LM5157EVM-BST include the LM5157 IC?

Yes, the LM5157EVM-BST integrates the LM5157QRTERQ1 - a 2.2-MHz wide-VIN boost/SEPIC/flyback controller in WQFN-16 package - as its core control IC. This is confirmed in the Bill of Materials (Table 6-1) and schematic (Figure 6-7), where U1 is explicitly labeled LM5157QRTERQ1.

Can the LM5157EVM-BST operate with input voltages below 3 V?

No. The LM5157EVM-BST is characterized and validated only for 3 V to 9 V input operation per Table 1-1 and Section 1.1 of the User's Guide. Operation below 3 V is outside the specified range and may result in failure to start, unstable regulation, or undefined protection behavior.

How is output overvoltage protection implemented on the LM5157EVM-BST?

The LM5157EVM-BST uses the LM5157's internal output overvoltage protection circuitry, which triggers at 13.6 V (per Table 1-1). This is enforced via the feedback network and internal comparator, independent of external components - verified in test results showing latch-off behavior during OVP events.

What jumper configurations enable external clock synchronization on the LM5157EVM-BST?

To enable external clock synchronization on the LM5157EVM-BST, remove jumper resistor R10 and connect the external clock signal to test point TP6 (SYNC), as specified in Table 1-2 and Figure 4-1. The SYNC pin accepts 1.8–2.4 kHz signals, and the module supports both free-running and synchronized modes depending on J11 and R10 state.