Datasheet LTC3535 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | Dual Channel 550mA 1MHz Synchronous Step-Up DC/DC Converter |
| Seiten / Seite | 16 / 7 — PIN FUNCTIONS. VOUT1 (Pin 1):. VIN2 (Pin 7):. SHDN2 (Pin 8):. SW1 (Pin … |
| Dateiformat / Größe | PDF / 1.2 Mb |
| Dokumentensprache | Englisch |
PIN FUNCTIONS. VOUT1 (Pin 1):. VIN2 (Pin 7):. SHDN2 (Pin 8):. SW1 (Pin 2):. FB2 (Pin 9):. GND (Pins 3, 6, Exposed Pad Pin 13):
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LTC3535
PIN FUNCTIONS VOUT1 (Pin 1):
Output Voltage Sense and Drain of the
VIN2 (Pin 7):
Battery Input Voltage for Channel 2. Connect Internal Synchronous Rectifier for Channel 1. PCB trace a minimum of 1µF ceramic decoupling capacitor from this length from VOUT1 to the output filter capacitor (4.7µF pin to ground. minimum) should be as short and wide as possible.
SHDN2 (Pin 8):
Logic Controlled Shutdown Input for Chan-
SW1 (Pin 2):
Switch Pin for Channel 1. Connect inductor nel 2. There is an internal 4MΩ pull-down on this pin. between SW1 and VIN1. Keep PCB trace lengths as short SHDN = High: Normal operation. and wide as possible to reduce EMI. If the inductor current falls to zero, or SHDN1 is low, an internal anti-ringing switch SHDN = Low: Shutdown, quiescent current < 1µA. is connected from SW1 to VIN1 to minimize EMI.
FB2 (Pin 9):
Feedback Input to the gm Error Amplifier of
GND (Pins 3, 6, Exposed Pad Pin 13):
Signal and Power Channel 2. Connect resistor divider tap to this pin. The Ground. Provide a short direct PCB path between GND output voltage can be adjusted from 1.5V to 5.25V by: and the (–) side of the input and output capacitors. The VOUT = 1.195V × [1 + (R4/R3)] exposed pad must be soldered to the PCB ground plane.
V
It serves as another ground connection and as a means
IN1 (Pin 10):
Battery Input Voltage for Channel 1. Connect a minimum of 1µF ceramic decoupling capacitor from this of conducting heat away from the die. pin to ground.
VOUT2 (Pin 4):
Output Voltage Sense and Drain of the
SHDN1 (Pin 11):
Logic Controlled Shutdown Input for Chan- Internal Synchronous Rectifier for Channel 2. PCB trace nel 1. There is an internal 4MΩ pull-down on this pin. length from VOUT2 to the output filter capacitor (4.7µF minimum) should be as short and wide as possible. SHDN = High: Normal operation.
SW2 (Pin 5):
Switch Pin for Channel 2. Connect inductor SHDN = Low: Shutdown, quiescent current < 1µA. between SW2 and VIN2. Keep PCB trace lengths as short
FB1 (Pin 12):
Feedback Input to the gm Error Amplifier and wide as possible to reduce EMI. If the inductor current of Channel 1. Connect resistor divider tap to this pin. The falls to zero, or SHDN2 is low, an internal anti-ringing switch output voltage can be adjusted from 1.5V to 5.25V by: is connected from SW2 to VIN2 to minimize EMI. VOUT = 1.195V × [1 + (R2/R1)]. 3535fa 7 Document Outline Features Description Applcations Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts
PIN FUNCTIONS VOUT1 (Pin 1):
Output Voltage Sense and Drain of the
VIN2 (Pin 7):
Battery Input Voltage for Channel 2. Connect Internal Synchronous Rectifier for Channel 1. PCB trace a minimum of 1µF ceramic decoupling capacitor from this length from VOUT1 to the output filter capacitor (4.7µF pin to ground. minimum) should be as short and wide as possible.
SHDN2 (Pin 8):
Logic Controlled Shutdown Input for Chan-
SW1 (Pin 2):
Switch Pin for Channel 1. Connect inductor nel 2. There is an internal 4MΩ pull-down on this pin. between SW1 and VIN1. Keep PCB trace lengths as short SHDN = High: Normal operation. and wide as possible to reduce EMI. If the inductor current falls to zero, or SHDN1 is low, an internal anti-ringing switch SHDN = Low: Shutdown, quiescent current < 1µA. is connected from SW1 to VIN1 to minimize EMI.
FB2 (Pin 9):
Feedback Input to the gm Error Amplifier of
GND (Pins 3, 6, Exposed Pad Pin 13):
Signal and Power Channel 2. Connect resistor divider tap to this pin. The Ground. Provide a short direct PCB path between GND output voltage can be adjusted from 1.5V to 5.25V by: and the (–) side of the input and output capacitors. The VOUT = 1.195V × [1 + (R4/R3)] exposed pad must be soldered to the PCB ground plane.
V
It serves as another ground connection and as a means
IN1 (Pin 10):
Battery Input Voltage for Channel 1. Connect a minimum of 1µF ceramic decoupling capacitor from this of conducting heat away from the die. pin to ground.
VOUT2 (Pin 4):
Output Voltage Sense and Drain of the
SHDN1 (Pin 11):
Logic Controlled Shutdown Input for Chan- Internal Synchronous Rectifier for Channel 2. PCB trace nel 1. There is an internal 4MΩ pull-down on this pin. length from VOUT2 to the output filter capacitor (4.7µF minimum) should be as short and wide as possible. SHDN = High: Normal operation.
SW2 (Pin 5):
Switch Pin for Channel 2. Connect inductor SHDN = Low: Shutdown, quiescent current < 1µA. between SW2 and VIN2. Keep PCB trace lengths as short
FB1 (Pin 12):
Feedback Input to the gm Error Amplifier and wide as possible to reduce EMI. If the inductor current of Channel 1. Connect resistor divider tap to this pin. The falls to zero, or SHDN2 is low, an internal anti-ringing switch output voltage can be adjusted from 1.5V to 5.25V by: is connected from SW2 to VIN2 to minimize EMI. VOUT = 1.195V × [1 + (R2/R1)]. 3535fa 7 Document Outline Features Description Applcations Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts