MAX764/MAX765/MAX766 are three low-to-1.5W buck converters with high efficiency, low output current, and an internal power MOSFET.
The MAX764, MAX765, and MAX766 are BiCMOS inverting switch‑mode power supplies that provide fixed outputs of –5 V, –12 V, and –15 V, respectively, with an adjustable range from –1 V to –16 V using external resistors. They feature a current‑limited pulse‑frequency‑modulated (PFM) control scheme, an internal P‑channel MOSFET, and operate with miniature surface‑mount inductors at up to 300 kHz.
The document includes electrical characteristics, absolute maximum ratings, typical operating curves, pin descriptions, and design guidelines for inductors, diodes, and capacitors. Component supplier tables and application notes for LCD‑bias generators, portable instruments, and battery‑powered systems are also provided.
| Input voltage range | 3 V to 16 V |
|---|---|
| Fixed output voltages | -5 V (MAX764), -12 V (MAX765), -15 V (MAX766) |
| Adjustable output range | -1 V to -16 V |
| Switching frequency | up to 300 kHz |
| Maximum supply current | 120 µA |
| Peak inductor current limit | 0.75 A |
The devices operate with an input voltage between 3 V and 16 V.
By connecting external resistors R1 and R2 as shown in the adjustable‑output circuit, the output can be set from –1 V to –16 V.
The maximum supply current is 120 µA.
They switch at frequencies up to 300 kHz.