lp3203 Lowpower Semiconductor inc, lp3203 Datasheet - Page 9
![no-image](/images/no-image-200.jpg)
lp3203
Manufacturer Part Number
lp3203
Description
Pwm Step-down Dc/dc Convert
Manufacturer
Lowpower Semiconductor inc
Datasheet
1.LP3203.pdf
(10 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
lp3203-1.2J5F
Manufacturer:
POWER
Quantity:
20 000
Part Number:
lp3203-1.5J5F
Manufacturer:
POWER
Quantity:
20 000
Part Number:
lp3203-1.8J5F
Manufacturer:
POWER
Quantity:
20 000
Part Number:
lp3203-12B5F
Manufacturer:
LOWPOWER
Quantity:
20 000
Part Number:
lp3203-12J5F
Manufacturer:
POWER
Quantity:
20 000
Checking Transient Response
The regulator loop response can be checked by looking at the load transient response. Switching
regulators take several cycles to respond to a step in load current. When a load step occurs, VOUT
immediately shifts by an amount equal to ∆ILOAD (ESR), where ESR is the effective series
resistance of COUT. ∆ILOAD also begins to charge or discharge COUT generating a feedback error
signal used by the regulator to return VOUT to its steady-state value. During this recovery time,
VOUT can be monitored for overshoot or ringing that would indicate a stability problem.
Layout Considerations
LP3203 – Ver. 1.0 Datasheet
Follow the PCB layout guidelines for optimal performance of LP3203.
For the main current paths as indicated in bold lines, keep their traces short and wide.
Put the input capacitor as close as possible to the device pins (VIN and GND).
LX node is with high frequency voltage swing and should be kept small area. Keep analog
components away from LX node to prevent stray capacitive noise pick-up.
Connect feedback network behind the output capacitors. Keep the loop area small. Place the
feedback components near the LP3203.
Connect all analog grounds to a command node and then connect the command node to the
power ground behind the output capacitors.
Dec.-2006
Preliminary Datasheet
Page 9 of 10
LP3203