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| LTC3603_15 Datasheet, PDF (6/22 Pages) Linear Technology – 2.5A, 15V Monolithic Synchronous Step-Down Regulator | |||
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LTC3603
Typical Performance Characteristics
Load Regulation
0.10
FIGURE 6 CIRCUIT
VIN = 12V
0
â0.10
â0.20
0
0.5 1 1.5 2 2.5 3
LOAD CURRENT (A)
3603 G18
5V LDO Output Voltage
vs Temperature
5.10
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
â50 â25
0 25 50 75 100 125
TEMPERATURE (°C)
3603 G19
TRACK/SS Current
vs Temperature
1.40
1.35
1.30
1.25
1.20
1.15
1.10
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3603 G20
Pin Functions MSE/UF Package
INTVCC (Pin 1/Pin 3): Output of Internal 5V LDO.
SYNC/MODE (Pin 2/Pin 4): Mode Select and External Clock
Synchronization Input. Do not leave this pin floating.
PGOOD (Pin 3/Pin 5): Power Good Output. Open-drain
logic output that is pulled to ground when the output volt-
age is not within ±10% of regulation point.
RT (Pin 4/Pin 6): Frequency Set Pin.
ITH (Pin 5/Pin 7): Error Amplifier Compensation Point.
VFB (Pin 6/Pin 8): Feedback Pin.
SGND (Pin 7, Exposed Pad Pin 17/Pin 9, Exposed Pad
Pin 21): Signal Ground. Exposed pad is signal ground
and must be soldered to the PCB for rated thermal
performance.
RUN (Pin 8/Pin 10): Run Control Input. This pin may be tied
to PVIN to enable the chip. Do not leave this pin floating.
TRACK/SS (Pin 9/Pin 11): Tracking Input for the Controller
or Optional External Soft-Start Input. This pin allows the
start-up of VOUT to âtrackâ the external voltage at this pin
using an external resistor divider. An external soft-start can
be programmed by connecting a capacitor between this
pin and ground. Leave this pin floating to use the internal
1ms soft-start clamp. Do not tie this pin to INTVCC or to
PVIN.
PGND (Pins 10, 11/Pins 12, 13, 14, 15): Power
Ground.
SW (Pins 12, 13/Pins 16, 17, 18, 19): Switch Node Con-
nection to the Inductor.
BOOST (Pin 14/Pin 20): Bootstrapped Supply to the Top
Side Floating Gate Driver.
PVIN (Pins 15, 16/Pins 1,2): Power Input Supply. Decouple
this pin with a capacitor to PGND
3603fc
6
For more information www.linear.com/LTC3603
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