SC415 Semtech Corporation, SC415 Datasheet - Page 7

• Manufacturer Part Number: SC415
• Description: Dual Synchronous Buck Controller
• Manufacturer: Semtech Corporation

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Pin Descriptions
Pin #
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
T
Pin Name
VOUT1
VOUT2
VDD1
VDD2
PGD2
PGD1
ILIM2
ILIM1
BST1
BST2
TON
DH2
DH1
DL1
EN1
RTN
EN2
DL2
PAD
LX1
SS1
FB1
FB2
SS2
LX2
Pin Function
Switching (phase) node for VOUT1
Boost capacitor connection for VOUT1 high-side gate drive
5V supply input for VOUT1 analog circuits and gate drive outputs. Under-voltage lockout for the 5V supply is
sensed on VDD1 only.
Gate drive output for the VOUT1 low-side external MOSFET
Enable input for VOUT1. Ground to disable the VOUT1 switcher. Leave open to enable VOUT1 switcher with
power-save disabled. Connect to VDD1 to enable VOUT1 in power-save mode.
Soft-start input for VOUT1. For independent start-up, connect a capacitor to RTN.
Connect to the output capacitor of VOUT1. Used for DH1 On-Time generation, and for VOUT1 regulation when
FB1 is connected to VDD1 or RTN.
Feedback input for VOUT1. Connect to an external resistor divider to adjust VOUT1, or connect to RTN or VDD1
to select internal feedback resistors via the VOUT1 pin.
Analog return (ground) for both VOUT1 and VOUT2
On-time adjust input. Connect a resistor from VIN to TON to program the on-time. The on-time one-shot for
VOUT1 is internally set at 20% greater than for VOUT2, to prevent frequency interaction between the two con-
verters.
Feedback input for VOUT2. Connect to an external resistor divider to adjust VOUT2, or connect to RTN or VDD2
to select internal feedback resistors via the VOUT2 pin.
Connect to the output capacitor of VOUT2. Used for side 2 On-Time generation, and for VOUT2 regulation when
FB2 is connected to VDD2 or RTN.
Soft-start input for VOUT1. For independent start-up, connect a capacitor to RTN.
Enable input for VOUT2. Ground to disable the VOUT2 switcher. Leave open to enable VOUT2 switcher with
power-save disabled. Connect to VDD2 to enable VOUT2 in power-save mode.
Gate drive output for the VOUT2 low-side external MOSFET
5V supply input for VOUT2 analog circuits and gate drive outputs. VDD2 must connect to the same supply as
VDD1.
Boost capacitor connection for VOUT2 high-side gate drive
Switching (phase) node for VOUT2
Gate drive output for the VOUT2 high-side external MOSFET
Current limit input for VOUT2. Connect through a resistor to the drain of the VOUT2 low-side MOSFET.
Open-drain Power Good output for VOUT2
Open-drain Power Good output for VOUT1
Current limit input for VOUT1. Connect through a resistor to the drain of the VOUT1 low-side MOSFET.
Gate drive output for the VOUT1 high-side external MOSFET
Power ground for VOUT1 and VOUT2 gate drivers, and thermal pad for heatsinking
SC415
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