Overview
The LM3691TL-1.5/NOPB is a high-accuracy, miniature 1-A step-down DC-DC converter designed by Texas Instruments. This converter is optimized for powering ultra-low-voltage circuits from a single Li-Ion cell or 3-cell NiMH/NiCd batteries. It operates over an input voltage range of 2.3 V to 5.5 V and provides a fixed output voltage of 1.5 V with ±1% DC output voltage precision. The device is packaged in a 6-pin DSBGA (YZR) package, making it suitable for portable applications where space is a constraint.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM3691TL-1.5/NOPB |
| Package Type | 6-WFBGA, DSBGA (YZR) |
| Number of Pins | 6 |
| Operating Temperature Range | -30°C to 85°C |
| Input Voltage Range | 2.3 V to 5.5 V |
| Output Voltage | 1.5 V (Fixed) |
| Maximum Output Current | 1 A |
| Switching Frequency | 3600 kHz to 4400 kHz |
| Quiescent Current (Typical) | 64 μA |
| Control Mode | Voltage Mode |
| Synchronous Rectification | Yes |
| RoHS Status | Compliant |
Key Features
- High accuracy with ±1% DC output voltage precision
- Automatic ECO/PWM mode switching for superior efficiency and low quiescent current under light load conditions
- MODE pin to select ECO or Forced PWM mode
- Current overload and thermal shutdown protections
- Only three external surface-mount components required: a 1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF output capacitor
- Compact 6-pin DSBGA package with dimensions of 1.3 mm x 1.5 mm x 0.675 mm
- Efficiency up to 95%
- Pulse Width Modulation (PWM) control technique
Applications
The LM3691TL-1.5/NOPB is designed for use in portable applications, including:
- Powering ultra-low-voltage circuits from a single Li-Ion cell or 3-cell NiMH/NiCd batteries
- Handheld devices such as smartphones, tablets, and GPS devices
- Wearable electronics like smartwatches and fitness trackers
- Portable medical devices and diagnostic equipment
- Other battery-powered devices requiring high efficiency and compact size
Q & A
- What is the input voltage range of the LM3691TL-1.5/NOPB?
The input voltage range is from 2.3 V to 5.5 V.
- What is the fixed output voltage of the LM3691TL-1.5/NOPB?
The fixed output voltage is 1.5 V.
- What is the maximum output current of the LM3691TL-1.5/NOPB?
The maximum output current is 1 A.
- What is the switching frequency range of the LM3691TL-1.5/NOPB?
The switching frequency range is from 3600 kHz to 4400 kHz.
- Does the LM3691TL-1.5/NOPB have synchronous rectification?
Yes, it does have synchronous rectification.
- What is the quiescent current in ECO mode for the LM3691TL-1.5/NOPB?
The quiescent current in ECO mode is typically 64 μA.
- What are the key external components required for the LM3691TL-1.5/NOPB?
The key external components required are a 1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF output capacitor.
- Is the LM3691TL-1.5/NOPB RoHS compliant?
Yes, it is RoHS compliant.
- What is the operating temperature range of the LM3691TL-1.5/NOPB?
The operating temperature range is from -30°C to 85°C.
- What is the package type and dimensions of the LM3691TL-1.5/NOPB?
The package type is 6-pin DSBGA (YZR) with dimensions of 1.3 mm x 1.5 mm x 0.675 mm.
