Datasheet LT3380 (Analog Devices) - 9
| Hersteller | Analog Devices |
| Beschreibung | Multioutput Power Management Solution with 4 Buck Switching and 3 LDO Linear Regulators with I2C |
| Seiten / Seite | 28 / 9 — PIN FUNCTIONS PVIN1 (Pin 15):. VIN (Pin 27):. PVIN2 (Pin 16):. EN_L2 (Pin … |
| Dateiformat / Größe | PDF / 1.6 Mb |
| Dokumentensprache | Englisch |
PIN FUNCTIONS PVIN1 (Pin 15):. VIN (Pin 27):. PVIN2 (Pin 16):. EN_L2 (Pin 30):. SW3 (Pin 31):. EN_B1 (Pin 17):. IRQ (Pin 32):
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LT3380
PIN FUNCTIONS PVIN1 (Pin 15):
Power Input for Step-Down Switching
VIN (Pin 27):
Supply Voltage Input. This pin should be Regulator 1. Tie this pin to VIN supply. This pin should bypassed to ground with a 1μF or greater ceramic capaci- be bypassed to ground with a 10μF or greater ceramic tor. All switching regulator PVIN supplies should be tied capacitor. to VIN.
PVIN2 (Pin 16):
Power Input for Step-Down Switching
EN_L2 (Pin 30):
Enable LDO2 Input. Active high Regulator 2. Tie this pin to the VIN supply. This pin should enables LDO2. A weak pull-down pulls EN_L2 low when be bypassed to ground with a 10μF or greater ceramic left floating. capacitor.
SW3 (Pin 31):
Switch Pin for Step-Down Switching
EN_B1 (Pin 17):
Enable Step-Down Switching Regulator 1. Regulator 3. Connect one side of step-down switching Active high input enables step-down switching regulator 1. regulator 3 inductor to this pin. A weak pull-down pulls EN_B1 low when left floating.
IRQ (Pin 32):
Interrupt Request Output. Open-drain driver
EN_B2 (Pin 18):
Enable Step-Down Switching Regulator 2. is pulled low for power good, undervoltage, and over- Active high input enables step-down switching regulator 2. temperature warning and fault conditions. Clear IRQ by A weak pull-down pulls EN_B2 low when left floating. writing to the I2C CLIRQ command register.
GND (Pins 19/26/28/29/33/38):
Ground.
EN_B3 (Pin 34):
Enable Step-Down Switching Regulator 3.
SW2 (Pin 20):
Switch Pin for Step-Down Switching Active high input enables step-down switching regulator 3. Regulator 2. Connect one side of step-down switching A weak pull-down pulls EN_B3 low when left floating. regulator 2 inductor to this pin.
PVIN3 (Pin 35):
Power Input for Step-Down Switching
PWR_ON (Pin 21):
Power On. PWR_ON is a master Regulator 3. Tie this pin to VIN supply. This pin should be enable and disable input. When low, PWR_ON inhibits bypassed to ground with a 10μF or greater ceramic capacitor. the regulator enable pins. When high, PWR_ON allows
PVIN4 (Pin 36):
Power Input for Step-Down Switching enable pin operation. Regulator 4. Tie this pin to VIN supply. This pin should be
FB_B2 (Pin 22):
Feedback Input for Step-Down Switching bypassed to ground with a 10μF or greater ceramic capacitor. Regulator 2. Set output voltage using resistor divider con-
EN_B4 (Pin 37):
Enable Step-Down Switching Regulator 4. nected from the output of step-down switching regulator Active high enables step-down switching regulator 4. A 2 to this pin to ground. week pull-down pulls EN_B4 low when left floating.
FB_B1 (Pin 23):
Feedback Input for Step-Down Switching
PGOOD (Pin 39):
Power Good Output. Open-drain output Regulator 1. Set output voltage using resistor divider pulls low when any enabled regulator falls below power connected from the output of step-down switching regu- good threshold or during dynamic voltage slew unless lator 1 to this pin to ground. disabled in command register. Pulls low when all regula-
FB_B4 (Pin 24):
Feedback Input for Step-Down Switching tors are disabled. Regulator 4. Set output voltage using resistor divider con-
SW4 (Pin 40):
Switch Pin for Step-Down Switching nected from the output of step-down switching regulator Regulator 4. Connect one side of step-down switching 4 to this pin to ground. regulator 4 inductor to this pin.
FB_B3 (Pin 25):
Feedback Input for Step-Down Switching
GND (Exposed Pad Pin 41):
Ground. The exposed pad Regulator 3. Set output voltage using resistor divider con- must be connected to a continuous ground plane of nected from the output of step-down switching regulator the printed circuit board by multiple interconnect vias 3 to this pin to ground. directly under the LT3380 to maximize electrical and thermal conduction. Rev. 0 For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction Step-Down Switching Regulators Slewing DAC Reference Operation Power On Sequencing Power Off Sequencing Fault Detectionand Reporting I2C Operation Applications Information Thermal Considerations and Board Layout Typical Applications Package Description Typical Application Related Parts
PIN FUNCTIONS PVIN1 (Pin 15):
Power Input for Step-Down Switching
VIN (Pin 27):
Supply Voltage Input. This pin should be Regulator 1. Tie this pin to VIN supply. This pin should bypassed to ground with a 1μF or greater ceramic capaci- be bypassed to ground with a 10μF or greater ceramic tor. All switching regulator PVIN supplies should be tied capacitor. to VIN.
PVIN2 (Pin 16):
Power Input for Step-Down Switching
EN_L2 (Pin 30):
Enable LDO2 Input. Active high Regulator 2. Tie this pin to the VIN supply. This pin should enables LDO2. A weak pull-down pulls EN_L2 low when be bypassed to ground with a 10μF or greater ceramic left floating. capacitor.
SW3 (Pin 31):
Switch Pin for Step-Down Switching
EN_B1 (Pin 17):
Enable Step-Down Switching Regulator 1. Regulator 3. Connect one side of step-down switching Active high input enables step-down switching regulator 1. regulator 3 inductor to this pin. A weak pull-down pulls EN_B1 low when left floating.
IRQ (Pin 32):
Interrupt Request Output. Open-drain driver
EN_B2 (Pin 18):
Enable Step-Down Switching Regulator 2. is pulled low for power good, undervoltage, and over- Active high input enables step-down switching regulator 2. temperature warning and fault conditions. Clear IRQ by A weak pull-down pulls EN_B2 low when left floating. writing to the I2C CLIRQ command register.
GND (Pins 19/26/28/29/33/38):
Ground.
EN_B3 (Pin 34):
Enable Step-Down Switching Regulator 3.
SW2 (Pin 20):
Switch Pin for Step-Down Switching Active high input enables step-down switching regulator 3. Regulator 2. Connect one side of step-down switching A weak pull-down pulls EN_B3 low when left floating. regulator 2 inductor to this pin.
PVIN3 (Pin 35):
Power Input for Step-Down Switching
PWR_ON (Pin 21):
Power On. PWR_ON is a master Regulator 3. Tie this pin to VIN supply. This pin should be enable and disable input. When low, PWR_ON inhibits bypassed to ground with a 10μF or greater ceramic capacitor. the regulator enable pins. When high, PWR_ON allows
PVIN4 (Pin 36):
Power Input for Step-Down Switching enable pin operation. Regulator 4. Tie this pin to VIN supply. This pin should be
FB_B2 (Pin 22):
Feedback Input for Step-Down Switching bypassed to ground with a 10μF or greater ceramic capacitor. Regulator 2. Set output voltage using resistor divider con-
EN_B4 (Pin 37):
Enable Step-Down Switching Regulator 4. nected from the output of step-down switching regulator Active high enables step-down switching regulator 4. A 2 to this pin to ground. week pull-down pulls EN_B4 low when left floating.
FB_B1 (Pin 23):
Feedback Input for Step-Down Switching
PGOOD (Pin 39):
Power Good Output. Open-drain output Regulator 1. Set output voltage using resistor divider pulls low when any enabled regulator falls below power connected from the output of step-down switching regu- good threshold or during dynamic voltage slew unless lator 1 to this pin to ground. disabled in command register. Pulls low when all regula-
FB_B4 (Pin 24):
Feedback Input for Step-Down Switching tors are disabled. Regulator 4. Set output voltage using resistor divider con-
SW4 (Pin 40):
Switch Pin for Step-Down Switching nected from the output of step-down switching regulator Regulator 4. Connect one side of step-down switching 4 to this pin to ground. regulator 4 inductor to this pin.
FB_B3 (Pin 25):
Feedback Input for Step-Down Switching
GND (Exposed Pad Pin 41):
Ground. The exposed pad Regulator 3. Set output voltage using resistor divider con- must be connected to a continuous ground plane of nected from the output of step-down switching regulator the printed circuit board by multiple interconnect vias 3 to this pin to ground. directly under the LT3380 to maximize electrical and thermal conduction. Rev. 0 For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction Step-Down Switching Regulators Slewing DAC Reference Operation Power On Sequencing Power Off Sequencing Fault Detectionand Reporting I2C Operation Applications Information Thermal Considerations and Board Layout Typical Applications Package Description Typical Application Related Parts