Datasheet LTM4691 (Analog Devices) - 8

LTM4691
BLOCK DIAGRAM
VIN BUCK1 C4 RUN1 B3 + ENBUCK1 SWITCH 0.4V – LOGIC 0.47μH V BUCK AND OUT1 OT CONTROL ANTI- MODE/SYNC E4, F3, F4 B4 SHOOT 0° THROUGH OSCILLATOR V + 0.5V PULSE SKIP C G FB1 M MODE FC – A3 DETECTION BURST 0.55V VIN INTERNAL 0.5V BUCK2 C1 REFERENCE 0.49V 180° 0.4V SWITCH LOGIC OVER 0.47μH OT V BUCK AND OUT2 TEMPERATURE CONTROL ANTI- RUN2 DETECT E1, F1, F2 B2 + SHOOT ENBUCK2 THROUGH 0.4V – V + 0.5V 0.55V C + G FB2 M – – A2 FB1 + PGOOD B1 0.49V – ENBUCK1 ENBUCK2 0.55V + – FB2 + 0.49V – GND: C2, C3, D1, D2, D3, D4, E2, E3 4691 BD
DECOUPLING REQUIREMENTS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
CIN External Input Capacitor Requirement IOUT = 2A 10 µF (VIN = 2.25V to 3.6V, VOUT = 1.5V) (Each Channel) (For Each Channel) COUT1,2 External Output Capacitor Requirement IOUT = 2A 22 µF (VIN = 2.25V to 3.6V, VOUT = 1.5V) Rev. 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information VIN to VOUT Step-Down Ratios Output Voltage Programming Input Decoupling Capacitors Output Decoupling Capacitors Mode Selection Operating Frequency and External Synchronization Power GOOD Output Overvoltage Protection Output Voltage Soft-Start Dropout Operation Output Short-Circuit Protection and Recovery Load Sharing Using the Precision RUN Threshold Thermal Considerations and Output Current Derating Safety Considerations Layout Checklist/Example Applications Information Typical Applications Pin Configuration Table LTM4691 Component LGA Pinout Package Description Package Photo Related Parts