Specifications
| Type | Description |
|---|---|
| Part Number | LM46001 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | 16-lead HTSSOP (PWP), 6.60 mm x 5.10 mm nominal body, 0.65-mm lead pitch |
| Input Voltage Range | 3.5 to 60 V; recommended operating conditions, VIN to PGND |
| Maximum Load Current | 1 A; recommended operating conditions, output current IOUT |
| Adjustable Output Voltage Range | 1 to 28 V; recommended operating conditions, VOUT adjustable |
| Switching Frequency Range | 200 kHz to 2.2 MHz; adjustable switching frequency feature |
| Default Switching Frequency | 500 kHz; RT pin left floating / default setting |
| Operating Junction Temperature Range | -40 to 125 °C; recommended operating conditions, TJ |
| Quiescent Current in Regulation | 24 µA; feature summary, light-load regulation |
| Operating Quiescent Current, Switching | 24 µA typ; VEN=3.3 V, IOUT=0 A, RT=open, VBIAS=VOUT=3.3 V, RFBT=1 MΩ |
| Shutdown Quiescent Current | 2.3 µA typ, 5 µA max; VEN=0 V |
| Minimum Input Voltage for Startup | 3.8 V typ; VIN-MIN-ST |
| Operating Quiescent Current from VIN, Non-switching | 7 µA typ, 13 µA max; VEN=3.3 V, VFB=1.5 V, VBIAS=3.4 V external |
| Operating Quiescent Current from External VBIAS, Non-switching | 85 µA typ, 140 µA max; VEN=3.3 V, VFB=1.5 V, VBIAS=3.4 V external |
| Enable Internal LDO High Threshold | 1.2 V typ; VEN-VCC-H, voltage level to enable internal LDO |
| Enable Internal LDO Low Threshold | 0.4 V typ; VEN-VCC-L, voltage level to disable internal LDO |
| Precision Enable Switching Threshold | 2.0 V min, 2.1 V typ, 2.42 V max; VEN-VOUT-H, high level for switching and regulator output |
| Precision Enable Hysteresis | -305 mV typ; hysteresis between VOUT precision enable and disable thresholds |
| Enable Input Leakage Current | 0.8 µA typ, 1.75 µA max; VEN=3.3 V |
| Internal LDO Output Voltage | 3.3 V typ; VCC, VIN >= 3.8 V |
| VCC UVLO Rising Threshold | 3.14 V typ; VCC undervoltage lockout rising threshold |
| VCC UVLO Hysteresis | -567 mV typ; hysteresis between rising and falling UVLO thresholds |
| BIAS Changeover Rising Threshold | 2.96 V min, 3.2 V typ; internal LDO input changeover threshold to BIAS |
| BIAS Changeover Hysteresis | -71 mV typ; hysteresis between rising and falling BIAS changeover thresholds |
| Feedback Voltage Accuracy | 1.009 V min, 1.016 V typ, 1.023 V max; TJ=25°C |
| Feedback Voltage Accuracy | 0.999 V min, 1.016 V typ, 1.031 V max; TJ=-40°C to 85°C |
| Feedback Voltage Accuracy | 0.999 V min, 1.016 V typ, 1.039 V max; TJ=-40°C to 125°C |
| FB Pin Leakage Current | 0.2 nA typ, 65 nA max; FB=1.016 V |
| Thermal Shutdown Threshold | 160 °C typ; shutdown threshold |
| Thermal Shutdown Recovery Threshold | 150 °C typ; recovery threshold |
| Peak Inductor Current Limit | 2.07 A min, 2.45 A typ, 2.71 A max; IHS-LIMIT |
| Valley Inductor Current Limit | 0.94 A min, 1.1 A typ, 1.25 A max; ILS-LIMIT |
| Soft-start Charge Current | 1.17 µA min, 2.2 µA typ, 2.85 µA max; SS/TRK pin |
| Soft-start Discharge Resistance | 16 kΩ typ; UVLO, TSD, OCP, or EN=0 V |
| Internal Soft-start Time | 4.1 ms; internal soft-start feature |
| Absolute Maximum VIN to PGND | -0.3 to 65 V; absolute maximum ratings |
| Absolute Maximum PGOOD to AGND | -0.3 to 15 V; absolute maximum ratings, input voltage |
| Absolute Maximum SYNC to AGND | -0.3 to 5.5 V; absolute maximum ratings, input voltage |
| Absolute Maximum BIAS to AGND | -0.3 to 30 V; absolute maximum ratings, input voltage |
| Absolute Maximum CBOOT to SW | -0.3 to 5.5 V; absolute maximum ratings, output voltage |
| Storage Temperature Range | -65 to 150 °C; absolute maximum ratings, Tstg |
| ESD Rating, HBM | ±2000 V; ANSI/ESDA/JEDEC JS-001 human-body model |
| ESD Rating, CDM | ±500 V; JEDEC JESD22-C101 charged-device model |
| Junction-to-Ambient Thermal Resistance | 39.9 °C/W; PWP HTSSOP 16-pin package, JESD51-7 4-layer board, 1 W power dissipation |
| Junction-to-Case Top Thermal Resistance | 26.9 °C/W; PWP HTSSOP 16-pin package |
| Junction-to-Board Thermal Resistance | 21.7 °C/W; PWP HTSSOP 16-pin package |
| Junction-to-Case Bottom Thermal Resistance | 2.3 °C/W; PWP HTSSOP 16-pin package |
| Power-Good Output Type | Open-drain; PGOOD pin, use 10-kΩ to 100-kΩ pullup to logic rail or other DC voltage no higher than 12 V |
| Bootstrap Capacitor Recommendation | 470 nF; connect capacitor from CBOOT to SW |
| BIAS Bypass Capacitor Recommendation | 1 to 10 µF; when BIAS is used, place bypass capacitor from BIAS to ground |
| Datasheet Status | request_only |
Product Overview
The LM46001 is a Texas Instruments synchronous step-down voltage converter for Power_Management designs that require conversion from a 3.5 to 60 V input range to an adjustable 1 to 28 V output. The recommended operating output current is 1 A, and the switching frequency can be adjusted from 200 kHz to 2.2 MHz, with a 500 kHz default when the RT pin is left floating.
The device is supplied in a 16-lead HTSSOP (PWP) package with a 6.60 mm x 5.10 mm nominal body and 0.65-mm lead pitch. Thermal data for the PWP HTSSOP package includes 39.9 °C/W junction-to-ambient resistance, 26.9 °C/W junction-to-case top resistance, 21.7 °C/W junction-to-board resistance, and 2.3 °C/W junction-to-case bottom resistance.
Design-related functions include a 4.1 ms internal soft-start, 2.2 µA typical soft-start charge current, open-drain PGOOD output, 470 nF bootstrap capacitor recommendation, and optional BIAS operation with a 1 to 10 µF bypass capacitor. Protection and control parameters include peak and valley inductor current limits, VCC UVLO thresholds, enable thresholds, and 160 °C typical thermal shutdown.
Key Features
- 3.5 to 60 V recommended input voltage range
- 1 A recommended maximum output load current
- Adjustable 1 to 28 V regulated output range
- 200 kHz to 2.2 MHz adjustable switching frequency
- 500 kHz default switching with RT pin floating
- 24 µA quiescent current in light-load regulation
- 4.1 ms internal soft-start timing
- Open-drain PGOOD output with external pullup
- Peak inductor current limit rated 2.45 A typical
- Thermal shutdown threshold is 160 °C typical
Typical Applications
- Wide-input DC step-down rails
- 1 A regulated output supplies
- Adjustable 1 to 28 V rails
- Light-load regulated power conversion
- Power-good monitored regulator outputs
- Externally biased non-switching supply designs
- Enable-threshold controlled power rails
Procurement Notes
When requesting a quote for LM46001, 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 voltage range does the LM46001 support?
The LM46001 recommended operating input range is 3.5 to 60 V from VIN to PGND. The absolute maximum VIN to PGND rating is -0.3 to 65 V and should not be used as the normal operating range.
What output current and voltage range are specified?
The recommended operating output current is 1 A. The adjustable output voltage range is 1 to 28 V, making the device a synchronous step-down converter for regulated lower-voltage rails within those stated conditions.
What switching frequency options are available on LM46001?
The LM46001 supports an adjustable switching frequency range from 200 kHz to 2.2 MHz. If the RT pin is left floating, the default switching frequency is specified as 500 kHz.
What package is used for the LM46001 device?
The LM46001 is listed in a 16-lead HTSSOP (PWP) package. The nominal body size is 6.60 mm x 5.10 mm, and the lead pitch is 0.65 mm.
What support components are recommended for bootstrap and BIAS pins?
The bootstrap capacitor recommendation is 470 nF connected from CBOOT to SW. When BIAS is used, the datasheet facts specify a 1 to 10 µF bypass capacitor placed from BIAS to ground.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 20, 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.