STEVAL-ISV015V1 Up to 2.5 W solar USB supply based on the SPV1040 and LD39050 Data brief Features Proprietary Perturb and Observe embedded MPPT algorithm Very low input voltage (down to 0.3 V) Input reverse polarity protection Fully integrated solution with power MOSFET, reverse blocking, diode and output current sense resistor Ultra low dropout and low noise, low quiescent current LDO RoHS compliant Description overtemperature and overcurrent at the input are implemented. The LD39050 provides 500 mA The STEVAL-ISV015V1 demonstration board is a maximum current from an input voltage ranging solar harvester system designed to supply USB from 1.5 V to 5.5 V with a typical dropout voltage devices and is based on the ST devices SPV1040 of 200 mV. It is available in a fixed output voltage (solar voltage boost converter) and LD39050 version from 0.8 V up to 4.5 V (100 mV steps), or (voltage regulator with low quiescent current and adjustable between 0.8 V and V - V . The ultra in drop low noise). The SPV1040 is a high efficiency, low low drop-voltage, low quiescent current and low power and low voltage monolithic step-up noise features make it suitable for low power converter that operates over a 0.3 V to 5 V input battery-powered applications. Stability is ensured voltage range, therefore allowing the use of even using ceramic capacitors. The power supply a few solar cells in all portable applications where rejection is 65 dB at low frequencies and starts to the capability of handling low input voltages is of roll off at 10 kHz. An enable logic control function utmost importance. Despite the variation of puts the LD39050 in shut-down mode allowing a several conditions throughout the day (such as total current consumption of lower than 1 A. The irradiation, dirt, temperature, etc.) the SPV1040 device also includes short-circuit constant current allows the achievement of maximum efficiency limiting and thermal protection. (90% typ.) in terms of power harvested from the cells and transferred to the output thanks to the embedded MPPT algorithm. The SPV1040 allows the output voltage to be regulated by using an external resistive divider up to 5.2 V, limiting the current supplied to protect the battery and the measuring of input current and voltage to research the maximum power point through a dedicated input pin. Furthermore, the device can be shut off by driving an XSHUT pin to a logic level low, in order to save power when its working mode is not required. Self protection features like June 2012 Doc ID 023216 Rev 2 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 462 62 06 OU OU 6CT * -I-I -&-& 306 6/54 6R * 6R Schematic diagram STEVAL-ISV015V1 1 Schematic diagram Figure 1. Schematic diagram * * NI I3 N35 5 && U U MM MDNMDN DNDN 5 5 ,, 2 2 /HM /HM U& U& 2 2 2 2 K K S S && N N K K KK LR U& U& MHHM && 62S M6 )MAX 6CTRL 6 6 OUT 6 T T U U L)CTR )CTRL 306 433/0 5 5 R L OUT 6 T T , 8 )),,)33) 06 3-- & && 4 S N N 2 2 /HM/H M 2 2 .- .- 3/, 2 53 3500, 9 , 8 K K -- (( && U U * * 06 06 06 - V 2/4 Doc ID 023216 Rev 2 2&2& & & 2&2& 2 2 , , U U ( ( Z Z 2S 2S / / - - 2 2 - - 2 2 2 2 I I N N 4242 OU OU - - SN . 6) 3(5 8 L )CTR L )CTR 6CT S 6R S 6R