Datasheet LTC3100 (Analog Devices) - 10

LTC3100
PIN FUNCTIONS FBLDO (Pin 11):
Feedback Input to the gm Error Amplifier the Boost Converter. There is an internal 4MΩ pull-down for the LDO Regulator. Connect the resistor divider tap to on this pin. this pin. The output voltage can be adjusted from 0.6V RUNBST = High: Normal operation to 5.25V by: RUNBST = Low: Shutdown  R4 V  OUT _LDO = 0.600V • 1+
PGBST (Pin 15):
Open-Drain Output That Pulls to Ground  R3 When FBBST Is More Than 8% Below Its Regulated Volt-
FBBST (Pin 12):
Feedback Input to the gm Error Amplifier age. Connect a pull-up resistor from this pin to a positive for the Boost Converter. Connect the resistor divider tap supply less than 6V. to this pin. The output voltage can be adjusted from 1.5V
V
to 5.25V by:
INBST (Pin 16):
Input Voltage for the Boost Converter. Connect a minimum of 1µF ceramic decoupling capacitor  R2 V  from this pin to ground. OUT _BOOST = 1.20V • 1+  R1
Exposed Pad (Pin 17):
The Exposed Pad
must
be soldered
MODE (Pin 13):
Logic-Controlled Mode Select Pin for Both to the PCB ground plane. It serves as the power ground the Boost and Buck Converters. There is an internal 1MΩ connection, and as a means of conducting heat away pull-up on this pin to the higher of V from the die. INBST, VBST or VINBK. MODE = Float or High: Enables Burst Mode operation for both the boost and the buck. MODE = Low: Disables Burst Mode operation. Both con- verters will operate in fixed frequency mode regardless of load current.
RUNBST (Pin 14):
Logic-Controlled Shutdown Input for 3100fb 10 For more information www.linear.com/LTC3100 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts