SC4501STDEVB Semtech, SC4501STDEVB Datasheet - Page 4

• Manufacturer Part Number: SC4501STDEVB
• Description: EVALUATION BOARD
• Manufacturer: Semtech

Specifications of SC4501STDEVB

• Silicon Manufacturer: Semtech
• Application Sub Type: Step Up Switching Regulator
• Kit Application Type: Power Management - Voltage Regulator
• Silicon Core Number: SC4501
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

POWER MANAGEMENT
Pin Descriptions (MSOP-8)
Block Diagram
Block Diagram
2005 Semtech Corp.
Pin
4
2
3
5
6
7
8
1
Exposed Pad
Pin Name
COMP
ROSC
SHDN
SHDN
COMP
ROSC
GND
SW
FB
SS
REG_GOOD
SS
IN
ENABLE
FB
3
IN
6
2
1
8
7
1.1V
4.6 A
1.242V
REFERENCE
+
-
Power Supply Pin. Bypassed with capacitors close to the pin.
VOLTAGE
Pin Function
The output of the internal transconductance error amplifier. This pin is used for loop compensation.
The inverting input of the error amplifier. Tie to an external resistive divider to set the output voltage.
Shutdown Pin. The accurate 1.1V shutdown threshold and the 4.6uA shutdown pin current
hysteresis allow the user to set the undervoltage lockout threshold and hysteresis for the switching
regulator. Pulling this pin below 0.1V causes the converter to shut down to low quiescent current.
Tie this pin to IN if the UVLO and the shutdown features are not used. This pin should not be left
floating.
Ground. Tie to the ground plane.
Collector of the internal power transistor. Connect to the boost inductor and the rectifying diode.
A resistor from this pin to the ground sets the switching frequency.
Soft-Start Pin. A capacitor from this pin to the ground lengthens the start-up time and reduces start-
up current.
The exposed pad must be soldered to the ground plane on the PCB for good thermal conduction.
CMP
+
-
EA
Figure 2. SC4501 (MSOP-8) Block Diagram.
SHUTDOW N
THERMAL
REG
CLK
1.5 A
ENABLE
4
CLK
OSCILLATOR
-
+
PWM
INTERNAL
SUPPLY
SLOP E COMP
R
S
REG
Q
+
+
ILIM
+
-
I-LIMIT
ISEN
+
-
www.semtech.com
SC4501
GND
SW
5
4
R
SENSE