sc286ultrt Semtech Corporation, sc286ultrt Datasheet - Page 5

• Manufacturer Part Number: sc286ultrt
• Description: Dual Channel 4a Synchronous Step-down Regulator
• Manufacturer: Semtech Corporation

Pin Descriptions
19, 20, 21, 22
5, 6, 7, 8
Pin #
13, 14
15, 16
27, 28
1, 2
10
11
12
17
18
23
24
25
26
3
4
9
T
Thermal Pad
Pin Name
PGOODA
PGOODA
AGNDA
AGNDB
PGNDA
PGNDB
VOUTB
VOUTA
PVINA
AVINA
PVINB
AVINB
CTL
CTL
SSA
LXB
LXA
SSB
XA
XB
Pin Function
Input supply voltage for the converter power stage
Ground connection for the internal circuitry — AGNDA needs to be connected to PGNDA directly.
Power supply for the internal circuitry — AVINA is required to be connected to PVINA through an R-C filter of
1Ω and 100nF.
Control bit — see Table 1 for decoding. These pins have 500kΩ internal pull-down resistors which are switched
into the circuit whenever CTL
Power good indicator — when the output voltage reaches the PGOODA threshold, this pin will be open-drain
(after the PGOODA delay), otherwise, it is pulled low internally.
Soft Start — connect a soft-start capacitor to program the soft start time. There is a 5µA charging current
flowing out of the pin.
Output voltage sense pin
Ground connection for converter power stage
Switching node — connect an inductor between this pin and the output capacitor.
Input supply voltage for the converter power stage
Ground connection for the internal circuitry — AGNDB needs to be connected to PGNDB directly.
Power supply for the internal circuitry — AVINB is required to be connected to PVINB through an R-C filter of
1Ω and 100nF.
Control bit — see Table 1 for decoding. These pins have 500kΩ internal pull-down resistors which are switched
into the circuit whenever CTL
Power good indicator — when the output voltage reaches the PGOODA threshold, this pin will be open-drain
(after the PGOODA delay), otherwise, it is pulled low internally.
Soft Start — connect a soft-start capacitor to program the soft start time. There is a 5µA charging current
flowing out of the pin.
Output voltage sense pin
Ground connection for converter power stage
Switching node — connect an inductor between this pin and the output capacitor.
Thermal pad for heat sinking purposes — recommend to connect to PGND. It is not connected internally.
XA
XB
is low or when the part is in under-voltage lockout.
is low or when the part is in under-voltage lockout.
SC286
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