The MAX4036/MAX4037 and MAX4038/MAX4039 are single and dual operational amplifiers, suitable for single-cell lithium-ion or two-cell NiCd/NiMH/alkaline battery-powered applications. They feature ultra-low supply current, low operating voltage, and rail-to-rail outputs.
The MAX4036‑MAX4039 series are ultra‑low‑bias operational amplifiers that operate from a single 1.4 V to 3.6 V supply (1.8 V to 3.6 V when the internal reference is used). Each amplifier consumes only 800 nA of supply current, and the optional reference adds 1.1 µA. The devices feature rail‑to‑rail input and output stages, driving 5 kΩ loads within 25 mV of the supply rails.
These amplifiers are offered in several tiny packages (SC70, SOT23, UCSP™, µMAX®, and TDFN) and are suited for battery‑powered applications such as portable medical instruments, pagers, cell phones, and low‑power sensors. The datasheet provides detailed electrical characteristics, absolute maximum ratings, and typical performance graphs. This manual is written in Chinese.
| Reference Voltage (MAX4037/MAX4039) | 1.232 V ±0.5 % |
|---|---|
| Input Offset Voltage | ±2.0 mV max, 2.0 mV typical |
| Input Bias Current | 1 pA typical |
| Output Drive Capability | 5 kΩ load to within 25 mV of the rails |
The output can swing to within 25 mV of the supply rails while driving a 5 kΩ load.
The MAX4037 provides a 1.232 V reference with ±0.5 % tolerance.
The input bias current is typically 1 pA.