SC403MLTRT Semtech, SC403MLTRT Datasheet - Page 13

• Manufacturer Part Number: SC403MLTRT
• Manufacturer: Semtech

Specifications of SC403MLTRT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Pin Descriptions
23-25, PAD 3
4, 30, PAD 1
6, 9-11,
Pin #
PAD 2
15-22
12
13
14
26
27
28
29
31
32
1
2
3
5
7
8
Pin Name
PGOOD
EN/PSV
AGND
LXBST
PGND
VOUT
VDD
ILIM
TON
ENL
FBL
VIN
BST
LXS
NC
NC
FB
LX
SS
Feedback input for switching regulator used to program the output voltage — connect to an external resis-
tor divider from VOUT to AGND.
Switcher output voltage sense pin — also the input to the internal switch-over between VOUT and VLDO.
The voltage at this pin must be less than or equal to the voltage at the VDD pin.
Bias supply for the IC — when using the internal LDO as a bias power supply, the VDD is the LDO output.
When using an external power supply to bias the IC, the LDO output should be disabled.
Analog ground
Feedback input for the internal LDO — connect to an external resistor divider from VDD to AGND to pro-
gram the LDO output.
Input supply voltage
The soft start time is programmed by an internal current source charging a capacitor on this pin.
Bootstrap pin — connect a capacitor of at least 100nF from BST to LX to develop the floating supply for the
high-side gate drive.
No connection
LX Boost — connect to the BST capacitor.
Switching (phase) node
No connection
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 LXS.
LX sense — connects to R
Enable/power-save input for the switching regulator — connect to AGND to disable the switching regulator.
Float to operate in forced continuous mode (PSAVE disabled). Connect to VDD to operate with ultrasonic
PSAVE mode enabled.
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 signal for logic con-
trol, or program the VIN UVLO with a resistor divider between VIN, ENL, and AGND pins.
Pin Function
ILIM
.
SC403
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