Package Information
| Pitch (mm) | 0.5 |
| Lead Count (#) | 20 |
| Pkg. Dimensions (mm) | 3.99 x 3.99 x 0.90 |
| Pkg. Code | LCT |
| Pkg. Type | QFN |
Environmental & Export Classifications
| Moisture Sensitivity Level (MSL) | 3 |
| Pb (Lead) Free | Yes |
| ECCN (US) | EAR99 |
| HTS (US) | 8542390001 |
| RoHS (ISL91127IRAZ-T7A) | Download |
Product Attributes
| Lead Count (#) | 20 |
| Carrier Type | Reel |
| Moisture Sensitivity Level (MSL) | 3 |
| Pitch (mm) | 0.5 |
| Pkg. Dimensions (mm) | 4.0 x 4.0 x 0.90 |
| Pb (Lead) Free | Yes |
| Pb Free Category | Pb-Free 100% Matte Tin Plate w/Anneal-e3 |
| Temp. Range | -40 to +85°C |
| Country of Assembly | Taiwan |
| Country of Wafer Fabrication | Taiwan |
| Price (USD) | 1ku | 1.5 |
| Input Voltage (Max) (V) | 5.5 |
| Input Voltage (Max) [Rail 1] (V) | 5.5 - 5.5 |
| Input Voltage (Min) (V) | 1.8 |
| Input Voltage (Min) [Rail 1] (V) | 1.8 |
| Length (mm) | 4.0 |
| Longevity | 0000 Jul |
| MOQ | 250 |
| Output Current (Max) [Rail 1] (A) | 3 |
| Output Voltage (Max) (V) | 5.2 |
| Output Voltage (Max) [Rail 1] (V) | 5.2 |
| Output Voltage (Min) (V) | 1 |
| Output Voltage (Min) [Rail 1] (V) | 1 |
| Outputs (#) | 1 |
| POR | Yes |
| Parametric Category | Buck-boost Regulators (Integrated FETs) |
| Peak Efficiency (%) | 96 |
| Pkg. Type | QFN |
| Qualification Level | Standard |
| Quiescent Current | 30 µA |
| SYNCH Capability | No |
| Switching Frequency (KHz) | 2.9 - 2.9 |
| Switching Frequency Range (Typical) (kHz) | 2500 - 2500 |
| Thickness (mm) | 0.90 |
| Topology [Rail 1] | Buck-Boost |
| Width (mm) | 4.0 |
Description
The ISL91127 and ISL91127IR are high-current buck-boost switching regulators for systems using new battery chemistries. They use Renesas' proprietary buck-boost algorithm to maintain voltage regulation while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage.
They are capable of delivering at least 2A continuous output current (VOUT = 3.3V) over a battery voltage range of 2.5V to 4.35V. This maximizes the energy utilization of advanced single-cell Li-ion battery chemistries that have significant capacity left at voltages below the system voltage. The ISL91127 and ISL91127IR have a fully synchronous low ON-resistance, 4-switch architecture and a low quiescent current of only 30µA optimize efficiency under all load conditions.
The ISL91127 and ISL91127IR support stand-alone applications with a fixed 3.3V or 3.5V output voltage or adjustable output voltage with an external resistor divider. Output voltages as low as 1.0V or as high as 5.2V are supported.
The ISL91127 is available in a 20 bump, 0.4mm pitch WLCSP (2.15mmx1.74mm) package, and the ISL91127IR is available in a 20 Ld, 0.5mm pitch QFN (4mmx4mm) package. The 2.5MHz switching frequency further reduces the size of external components.