Package Information
| Lead Count (#) | 32 |
| Pkg. Code | LZZ |
| Pitch (mm) | 0.4 |
| Pkg. Type | QFN |
| Pkg. Dimensions (mm) | 3.99 x 3.99 x 0.90 |
Environmental & Export Classifications
| Moisture Sensitivity Level (MSL) | 3 |
| Pb (Lead) Free | Yes |
| ECCN (US) | EAR99 |
| HTS (US) | 8542390001 |
| RoHS (ISL95521AHRZ) | Download |
Product Attributes
| Lead Count (#) | 32 |
| Carrier Type | Tube |
| Moisture Sensitivity Level (MSL) | 3 |
| Pb (Lead) Free | Yes |
| Pb Free Category | Pb-Free 100% Matte Tin Plate w/Anneal-e3 |
| Temp. Range | See Datasheet |
| Country of Assembly | Taiwan |
| Country of Wafer Fabrication | Taiwan |
| Price (USD) | 1ku | 3.3759 |
| Audible Noise | No |
| Automatic Power Source Selection | Yes |
| Automatic Trickle Charge (Typical) | Set by user |
| Battery Charge Voltage | 2-4 cell battery, 16mV step |
| Battery Charge Voltage Adjustment | 16mV steps |
| Battery Chemistry | Multi-Cell Li+/Polymer |
| Battery Leakage Current (Max) | 245uA |
| Charge Current Limit Accuracy | ±2 |
| Charging Voltage Accuracy (Max) (±%) | 0.75 |
| DC Adapter Detection | Yes |
| Input Current Limit Accuracy (% (±)) | 2 |
| Input Voltage (Max) (V) | 25 |
| Input Voltage (Min) (V) | 4.75 |
| Input Voltage Range (V) | 4.75 - 25 |
| Length (mm) | 4 |
| MOQ | 750 |
| Parametric Category | Battery Charger ICs |
| Pitch (mm) | 0.4 |
| Pkg. Dimensions (mm) | 4.0 x 4.0 x 0.90 |
| Pkg. Type | QFN |
| Qualification Level | Standard |
| Switching Frequency Range (Typical) (kHz) | 350 - 1000 |
| Thickness (mm) | 0.9 |
| Topology [Rail 1] | Buck, Hybrid Power Boost |
| Trickle Charge Current Range | 256mA, 128mA or 64mA |
| Width (mm) | 4 |
Description
The ISL95521A is a highly versatile combo battery charger configurable for operating as either a Hybrid Power Boost (HPB) charger or a Narrow VDC (NVDC) charger, supporting 2-, 3- or 4-cell batteries. Both configurations allow the battery to work with the adapter together to supply the system load when it exceeds the adapter capability, referred to as system Turbo mode. The HPB charger configuration reverse-boosts battery energy to system bus in order to help the adapter provide the system power in Turbo mode. NVDC charger configuration quickly turns on BGATE to enable the battery to help the adapter provide the system power in Turbo mode. The ISL95521A uses N-channel MOSFETs (NFETs) for all the switches to achieve the best performance and lowest BOM cost. The internal charge pump is capable of turning on all the NFETs fast or slow depending on the circumstance or the need. The ability to quickly turn on NFETs prevents system bus voltage drop when the battery is suddenly removed in Turbo mode or in Battery Learn mode. The ISL95521A provides many protection features including a PROCHOT# indicator for system low voltage, adapter overcurrent, battery overcurrent or overheating, with an array of SMBus programmable parameters for maximum flexibility. It also features hardware-based adapter current limit and battery-current limit in addition to SMBus programmable limits. The ISL95521A provides a high accuracy adapter current monitor, battery current monitor and system power monitor outputs. To provide maximum flexibility for working with high power and low power systems, it provides several configurable current-sense resistor value options to achieve the best trade-off of current sensing accuracy vs power loss. The ISL95521A uses the Renesas Robust Ripple Regulator (R3™) modulation scheme to provide excellent light-load efficiency and fast dynamic response. It is available in a 32 Ld 4 x 4mm2 QFN package.