SC417EVB Ver la hoja de datos (PDF) - Semtech Corporation
Número de pieza
componentes Descripción
Fabricante
SC417EVB Datasheet PDF : 29 Pages
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SC417/SC427
Pin Descriptions
Pin #
1
2
3
4, 30, PAD 1
Pin Name Pin Function
Feedback input for switching regulator used to program the output voltage — connect to an external resis-
FB
tor divider from VOUT to AGND.
Feedback input for the LDO — connect to an external resistor divider from VLDO to AGND — used to pro-
FBL
gram the LDO output.
5V power input for internal analog circuits and gate drives — connect to external 5V supply or configure
V5V
the LDO for 5V and connect to VLDO.
AGND
Analog ground
5
6, 9-11,
PAD 2
7
8
12
13, 23-25, 28,
PAD 3
14
VOUT
VIN
VLDO
BST
DH
LX
DL
Switcher output voltage sense pin — also the input to the internal switch-over between VOUT and VLDO.
Input supply voltage
LDO output
Bootstrap pin — connect a capacitor from BST to LX to develop the floating supply for the high-side gate
drive.
High-side gate drive — do not connect this pin
Switching (phase) node
Low-side gate drive — do not connect this pin
15-22
26
27
PGND
PGOOD
ILIM
Power ground
Open-drain power good indicator — high impedance indicates power is good. An external pull-up
resistor is required.
Current limit sense pin — used to program the current limit by connecting a resistor from ILIM to LX.
Enable/power-save input for the switching regulator — connect to AGND to disable the switching regulator.
Float to operate in forced continuous mode (power-save disabled). SC417 — connect to V5V to operate with
29
EN/PSV
ultra-sonic power-save mode enabled. SC427 — connect to V5V to operate with power-save mode enabled
with no minimum frequency.
31
TON
On-time programming input — set the on-time by connecting through a resistor to AGND
Enable input for the LDO — connect ENL to AGND to disable the LDO. Drive with logic to +3V for logic con-
32
ENL
trol, or program the VIN UVLO with a resistor divider between VIN, ENL, and AGND.
11
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