DocID023264 Rev 2

3/17

AN4123

SPV1040 operating description

1

SPV1040 operating description

The SPV1040 device is a high efficiency, low power and low voltage DC-DC converter that

provides a single output voltage up to 5.2 V. The combination of the SPV1040 device and

the LD39050 device provides an optimal solution to supply devices requiring a regulated

voltage.

The SPV1040 device is a 100 kHz fixed frequency PWM step-up converter able to maximize

the energy harvested by few solar cells thanks to the embedded MPPT algorithm which

maximizes the power generated from the panel by continuously tracking its output voltage

and current. The converter guarantees the overall application safety and its own safety by

stopping the PWM switching in the case of overvoltage, overcurrent or overtemperature

condition. The IC integrates a 120 m

Ω N-channel MOSFET power switch and a 140 mΩ P-

channel MOSFET synchronous rectifier.

Figure 2. Typical application circuit

The SPV1040 device acts as an impedance adapter between the PV module and the output

load. In fact, the equivalent circuit can be shown as in

Figure 3.

Figure 3. SPV1040 equivalent circuit