Datasheet A7987 (STMicroelectronics) - 3

A7987 Block diagram 2 Block diagram Figure 2. Block diagram
VCC VBIAS VIN BOOT EN EN BOOT ENABLE VREG UVLO CHARGE ISNS CURRENT SENSING REF and BIAS VRAMP HS - PWM DRIVER + COMP FB E/A + FB - LOGIC EN and TEMP OUT CONTROL MONITOR SOFT START LS DRIVER ISS - SS PG COMP + PGOOD FB VRAMP GND OSCILLATOR MASTER ILIM & RAMP SLAVE FUNCTION COMP FSW SYNCH ILIM
DS12928
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Rev 1 page 3/37
Document Outline Cover image Product status link / summary Features Applications Description 1 Application schematic 2 Block diagram 3 Pin settings 3.1 Pin connection 3.2 Pin description 3.3 Maximum ratings 3.4 Thermal data 3.5 ESD protection 4 Electrical characteristics 5 Functional description 5.1 Oscillator and synchronization 5.2 Soft-start 5.3 Error amplifier and light-load management 5.4 Low VIN operation 5.5 Overcurrent protection 5.6 Overtemperature protection 6 Application information 6.1 Input capacitor selection 6.2 Output capacitor selection 6.3 Inductor selection 6.4 Compensation network 6.4.1 Type II compensation network 6.4.2 Type III compensation network 6.5 Thermal considerations 6.6 Layout considerations 7 Demonstration board 8 Application ideas 8.1 Positive buck-boost 8.2 Negative buck-boost 9 Package information 9.1 HTSSOP16 package information 10 Ordering information Revision history