SC4624MLTRT View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
SC4624MLTRT
Semtech Corporation
'SC4624MLTRT' PDF : 20 Pages View PDF
SC4624
POWER MANAGEMENT
Pin Descriptions
Pin
SO-16
Pin
MLPQ-20
Pin Name
Pin Functions
6
1
PVIN1 Power supply voltage for high side MOSFETs.
8
2
9
3
10
4
ISET
SS
FS
Current limit setting pin. A resistor connected between ISET and AGND sets the over
current protection threshold. A ceramic decoupling between ISET pin to AGND have to
be reserved to prevent from noise influence.
Soft start time setting pin. A cap connected from this pin to GND sets the soft start up
time.
Oscillator frequency setting pin. An external resistor connected from this pin to GND
sets the oscillator frequency.
11,15 5,12
VCC Power supply voltage for the analog section of the controller.
12
6
PGOOD
Power good indicator. It is an open drain output. Low when the output is below the
power good threshold level.
7,8,9
NC No connection.
This is the output of the error amplifier. The voltage at this point is connected to the
13
10
COMP inverting input of the PWM comparator. A compensation network is required in order to
optimize the dynamic performance of the voltage mode control loop.
14
11
FB
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.
16
13
AGND Analog signal gound.
The oscillator frequency of the SC4624 is set by FS when SYNC/EN is pulled and
1
14
SYNC/EN held above 2V. Its synchronous mode is activated as SYNC/EN is driven by an exter-
nal clock. Its shutdown mode is invoked if SYNC/EN is pulled and held below 0.8V.
2
15
PGND1 Power ground.
3
16
PGND2 Power ground.
4
17
PH1 Switching nodes
5
18
PH2 Switching nodes
19
PH3 Switching nodes
7
20
PVIN2 Power supply voltage for high side MOSFETs.
THERMAL Pad for heatsinking purposes only. Connect to ground plane using multiple vias. Not
PAD electrically connected internally.
2008 Semtech Corp.
www.semtech.com
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