Specifications
| Type | Description |
|---|---|
| Part Number | LM5155 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | 12-pin WSON DSS, 3.00 mm × 2.00 mm nominal body |
| Input Operating Range | 3.5 V to 45 V; BIAS supplied through internal VCC regulator |
| Input Operating Range | 2.97 V to 16 V; BIAS = VCC |
| Minimum Boost Supply Voltage | 1.5 V; BIAS ≥ 3.5 V |
| Input Transient Protection | up to 50 V; BIAS pin absolute maximum support |
| Shutdown Current | ≤ 2.6 µA; low shutdown current feature |
| Operating Current | ≤ 480 µA; low operating current feature |
| Maximum Switching Frequency | 2.2 MHz; switching frequency range upper limit |
| Switching Frequency Range | 100 kHz to 2.2 MHz; programmed by external resistor at RT pin |
| Current Limit Threshold | 100 mV ±7%; low current limit threshold |
| MOSFET Driver Peak Current | 1.5 A; standard external MOSFET gate driver |
| Feedback Reference Accuracy | ±1%; internal feedback reference |
| Internal Reference | 1 V; LM5155 and LM51551 device options |
| Hiccup Mode Protection | Disabled; LM5155 device option |
| Hiccup Mode Protection | Enabled; LM51551 device option |
| BIAS to AGND Absolute Maximum | -0.3 V to 50 V; recommended operating junction temperature range |
| UVLO to AGND Absolute Maximum | -0.3 V to VBIAS + 0.3 V; recommended operating junction temperature range |
| SS to AGND Absolute Maximum | -0.3 V to 3.8 V; external voltage not specified for this pin |
| RT to AGND Absolute Maximum | -0.3 V to 3.8 V; external voltage not specified for this pin |
| FB to AGND Absolute Maximum | -0.3 V to 3.8 V; input pin absolute maximum |
| CS to AGND Absolute Maximum | -0.3 V to 0.3 V; DC condition |
| CS to AGND Transient Absolute Maximum | -1 V; 100 ns transient |
| CS to AGND Transient Absolute Maximum | -2 V; 20 ns transient |
| PGND to AGND Absolute Maximum | -0.3 V to 0.3 V; recommended operating junction temperature range |
| VCC to AGND Absolute Maximum | -0.3 V to 18 V; 18 V or VBIAS + 0.3 V, whichever is lower |
| GATE to AGND Transient Absolute Maximum | -1 V; 100 ns transient |
| GATE to AGND Transient Absolute Maximum | -2 V; 50 ns transient |
| PGOOD to AGND Absolute Maximum | -0.3 V to 18 V; maximum current sink limited to 1 mA when VPGOOD > VBIAS |
| Junction Temperature Absolute Maximum | -40°C to 150°C; operating lifetime derated above 125°C |
| Storage Temperature | -55°C to 150°C; absolute maximum rating |
| HBM ESD Rating | ±2000 V; ANSI/ESDA/JEDEC JS-001, all pins |
| CDM ESD Rating | ±500 V; JEDEC JESD22-C101, all pins |
| Recommended BIAS Input | 2.97 V min, 45 V max; TJ = -40°C to 125°C |
| Recommended VCC Voltage | 2.97 V min, 16 V max; TJ = -40°C to 125°C; VCC less than VBIAS + 0.3 V |
| Recommended UVLO Input | 0 V min, 45 V max; TJ = -40°C to 125°C |
| Recommended FB Input | 0 V min, 3.7 V max; TJ = -40°C to 125°C |
| Recommended Switching Frequency | 100 kHz min, 2200 kHz max; TJ = -40°C to 125°C |
| Synchronization Pulse Frequency | 100 kHz min, 2200 kHz max; TJ = -40°C to 125°C |
| Operating Junction Temperature | -40°C to 125°C; recommended operating condition |
| Junction-to-Ambient Thermal Resistance | 40.8°C/W; LM5155EVM-BST, 12-pin WSON DSS |
| Junction-to-Ambient Thermal Resistance | 63.7°C/W; 12-pin WSON DSS |
| Junction-to-Case Top Thermal Resistance | 61.0°C/W; 12-pin WSON DSS |
| Junction-to-Board Thermal Resistance | 32.1°C/W; 12-pin WSON DSS |
| Junction-to-Case Bottom Thermal Resistance | 11.2°C/W; 12-pin WSON DSS |
| BIAS Shutdown Current | 2.6 µA typ, 5 µA max; VBIAS = 12 V, VUVLO = 0 V |
| BIAS Operating Current | 480 µA typ, 540 µA max; VBIAS = 12 V, VUVLO = 2 V, VFB = VREF, RT = 220 kΩ |
| VCC Regulation | 6.5 V min, 6.85 V typ, 7 V max; VBIAS = 8 V, no load |
| VCC Regulation | 6.5 V min; VBIAS = 8 V, IVCC = 35 mA |
| VCC UVLO Rising Threshold | 2.75 V min, 2.85 V typ, 2.95 V max; VCC rising |
| Datasheet Status | request_only |
Product Overview
The LM5155 is a Texas Instruments nonsynchronous boost controller for Power_Management designs. The device is supplied in a 12-pin WSON DSS package with a 3.00 mm × 2.00 mm nominal body, supporting compact boost-controller layouts using an external MOSFET gate driver rated for 1.5 A peak current.
Input operation depends on the BIAS and VCC configuration. With BIAS supplied through the internal VCC regulator, the input operating range is 3.5 V to 45 V. When BIAS equals VCC, the range is 2.97 V to 16 V. The device also supports a 1.5 V minimum boost supply voltage when BIAS is at least 3.5 V, and the BIAS pin supports up to 50 V transient protection.
Control and protection parameters include a 100 kHz to 2.2 MHz switching-frequency range set by an external RT resistor, 100 mV ±7% current-limit threshold, ±1% feedback reference accuracy, and a 1 V internal reference. LM5155 has hiccup-mode protection disabled, while the related LM51551 option has hiccup-mode protection enabled.
Key Features
- 3.5 V to 45 V input with internal VCC regulator
- 2.97 V to 16 V operation when BIAS equals VCC
- 1.5 V minimum boost supply with BIAS at least 3.5 V
- BIAS pin supports up to 50 V transient protection
- 100 kHz to 2.2 MHz resistor-programmed switching frequency
- 100 mV ±7% current-limit threshold
- 1.5 A external MOSFET gate-driver peak current
- ±1% internal feedback reference accuracy
- 2.6 µA typical BIAS shutdown current at 12 V
- 480 µA typical BIAS operating current at 12 V
Typical Applications
- Boost converter controllers
- Wide-input power supplies
- External MOSFET power stages
- Synchronized switching supplies
- Low shutdown current rails
- UVLO-controlled power designs
Procurement Notes
When requesting a quote for LM5155, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What input range does the LM5155 support?
The LM5155 supports 3.5 V to 45 V operation when BIAS is supplied through the internal VCC regulator. When BIAS equals VCC, the stated input operating range is 2.97 V to 16 V.
What switching frequency range is available on LM5155?
The switching frequency range is 100 kHz to 2.2 MHz. The frequency is programmed by an external resistor connected to the RT pin, and the recommended switching-frequency range is also specified as 100 kHz to 2200 kHz.
What package is specified for this LM5155 entry?
The package case is a 12-pin WSON DSS with a 3.00 mm × 2.00 mm nominal body. Thermal data is specified for the 12-pin WSON DSS package.
Does LM5155 include hiccup-mode protection?
For the LM5155 device option, hiccup-mode protection is disabled. The extracted facts also identify LM51551 as the related device option with hiccup-mode protection enabled.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.