Datasheet LTC3407-3 (Analog Devices) - 5

LTC3407-3
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise specifi ed. Load Regulation Load Regulation Line Regulation
4 4 0.80 VOUT = 1.8V 3 3 0.60 IOUT = 200mA 2 0.40 2 Burst Mode OPERATION 0.20 1 1 Burst Mode OPERATION 0 0 0 ERROR (%) PULSE-SKIPPING ERROR (%) PULSE-SKIPPING ERROR (%) –0.20 OUT –1 MODE OUT –1 MODE OUT V V V –0.40 –2 –2 –0.60 –3 –3 V –0.80 IN = 3.6V, VOUT = 1.8V VIN = 5V, VOUT = 3.3V –4 NO LOAD ON OTHER CHANNEL NO LOAD ON OTHER CHANNEL –4 –1.00 1 10 100 1000 1 10 100 1000 2 3 4 5 6 LOAD CURRENT (mA) LOAD CURRENT (mA) VIN (V) 34073 G12 34073 G13 34073 G15
PIN FUNCTIONS VOUT1 (Pin 1):
Output Voltage Feedback Pin for Channel oscillator applied to this pin and pulse-skipping mode is 1. An internal resistive divider divides the output voltage automatically selected. Do not fl oat this pin. down for comparison to the internal reference voltage.
SW2 (Pin 7):
Regulator 2 Switch Node Connection to the
RUN1 (Pin 2):
Regulator 1 Enable. Forcing this pin to Inductor. This pin swings from VIN to GND. VIN enables regulator 1, while forcing it to GND causes
POR (Pin 8):
Power-On Reset . This common-drain logic regulator 1 to shut down. Do not fl oat this pin. output is pulled to GND when the output voltage falls below
VIN (Pin 3):
Main Power Supply. Must be closely decoupled –8.5% of regulation and goes high after 117ms when both to GND. channels are within regulation.
SW1 (Pin 4):
Regulator 1 Switch Node Connection to the
RUN2 (Pin 9):
Regulator 2 Enable. Forcing this pin to Inductor. This pin swings from VIN to GND. VIN enables regulator 2, while forcing it to GND causes regulator 2 to shut down. Do not fl oat this pin.
GND (Pin 5):
Ground. This pin is not connected internally. Connect to PCB ground for shielding.
VOUT2 (Pin 10):
Output Voltage Feedback Pin for Channel 2. An internal resistive divider divides the output voltage down
MODE/SYNC (Pin 6):
Combination Mode Selection and for comparison to the internal reference voltage. Oscillator Synchronization. This pin controls the operation of the device. When tied to VIN or GND, Burst Mode opera-
Exposed Pad (GND) (Pin 11):
Power Ground. Connect to tion or pulse-skipping mode is selected, respectively. The the (–) terminal of COUT, and (–) terminal of CIN. Must be oscillation frequency can be synchronized to an external connected to electrical ground on PCB. 34073fb 5