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LTC3670 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3670 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page LTC3670 6 3670f PIN FUNCTIONS BLOCK DIAGRAM SW (Pin 1): Buck Regulator Switch Node Connection to In- ductor. This pin connects to the drains of the buck regulator’s main PMOS and synchronous NMOS switches. GND (Pin 2): Ground. ENLDO1 (Pin 3): Enables the First Low Dropout Linear Regulator (LDO1) When High. This is a MOS gate input. There is an internal 4MΩ pull-down. ENLDO2 (Pin 4): Enables the Second Low Dropout Linear Regulator (LDO2) When High. This is a MOS gate input. There is an internal 4MΩ pull-down. ENBUCK (Pin 5): Enables the Buck Converter When High. This is a MOS gate input. There is an internal 4MΩ pull- down. BUCKFB (Pin 6): Feedback Voltage Input for the Buck Regulator. Typically, an external resistor divider feeds a fraction of the buck output voltage to this pin. PGOOD (Pin 7): Power Good Open-Drain NMOS Output. The PGOOD pin goes Hi-Z when all enabled outputs are within 8% of final value. LDO2_FB (Pin 8): Feedback Voltage Input for the Second Low Dropout Linear Regulator (LDO2). Typically, an ex- ternal resistor divider feeds a fraction of the LDO2 output voltage to this pin. LDO1_FB (Pin 9): Feedback Voltage Input for the First Low Dropout Linear Regulator (LDO1). Typically, an external resistor divider feeds a fraction of the LDO1 output volt- age to this pin. LDO1 (Pin 10): Output of the First Low Dropout Linear Regulator. This pin must be bypassed to ground with a 1μF or greater ceramic capacitor. LDO2 (Pin 11): Output of the Second Low Dropout Linear Regulator. This pin must be bypassed to ground with a 1μF or greater ceramic capacitor. VIN (Pin 12): Input Supply. This pin should be bypassed to ground with a 2.2μF or greater ceramic capacitor. Exposed Pad (Pin 13): Ground. This pin must be soldered to the PCB. 400mA BUCK 2 GND 3 ENLDO1 6 BUCKFB 4 ENLDO2 5 ENBUCK ENABLE BUCK 12 SW 2.25MHz OSC LOGIC LDO2_FB 3670 BD LDO1_FB PGOOD VIN 13 GND 800mV REFERENCE ENABLE_LDO2 ENABLE_LDO1 POWER GOOD COMPARATORS 7 LDO1 10 LDO2 11 9 8 1 LDO2 LDO1 |
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Similar Description - LTC3670 |
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