SC4620 Просмотр технического описания (PDF) - Semtech Corporation
Номер в каталоге
Компоненты Описание
производитель
SC4620
Semtech Corporation
SC4620 Datasheet PDF : 19 Pages
| |||
SC4620
POWER MANAGEMENT
Pin Descriptions
Pin
MLPQ-20
Pin Name
Pin Functions
1,2
PVIN Power supply voltage for high side MOSFETs.
Current limit setting pin. A resistor connected between ISET and AGND sets the over current
3
ISET protection threshold. A ceramic decoupling between ISET pin to AGND have to be reserved to
prevent from noise influence.
4
SS
Soft start time setting pin. A cap connected from this pin to GND sets the soft start up time.
5
FS
Oscillator frequency setting pin. An external resistor connected from this pin to GND sets the
oscillator frequency.
6
PGOOD
Power good indicator. It is an open drain output. Low when the output is below the power good
threshold level.
7,12
VCC Power supply voltage for the analog section of the controller.
8,19,20
9
10
11
13
NC No connection.
SYNC/EN
COMP
FB
The oscillator frequency of the SC4624A is set by FS when SYNC/EN is pulled and held above
2V. Its synchronous mode is activated as SYNC/EN is driven by an external clock. Its shutdown
mode is invoked if SYNC/EN is pulled and held below 0.8V.
This is the output of the error amplifier. The voltage at this point is connected to the inverting
input of the PWM comparator. A compensation network is required in order to optimize the dy-
namic performance of the voltage mode control loop.
The inverting input of the error amplifier. It serves as the output voltage feedback point for the
buck controller. It senses the output voltage through an external divider.
AGND Analog signal ground.
14,15
PGND Power ground.
16,17,18
PH Switching nodes
THERMAL Pad for heatsinking purposes only. Connect to ground plane using multiple vias. Not electrically
PAD connected internally.
2008 Semtech Corp.
www.semtech.com
Share Link: