SC4525ASETRT Semtech, SC4525ASETRT Datasheet - Page 6

• Manufacturer Part Number: SC4525ASETRT
• Description: IC STEP-DWN SW REG 3A 28V 8-SOIC
• Manufacturer: Semtech
• Type: Step-Down (Buck)r

Specifications of SC4525ASETRT

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Current - Output: 3A
• Frequency - Switching: 300kHz ~ 1.3MHz
• Voltage - Input: 8 ~ 28 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Power - Output: -
• Other names: SC4525ASETR

Block Diagram
COMP
COMP
ROSC
ROSC
SS/EN
SS/EN
FB
FB
3
3
6
6
7
7
5
5
FAULT
FAULT
SS/EN
SS/EN
V1
V1
FREQUENCY
FREQUENCY
FOLDBACK
FOLDBACK
+
+
+
+
-
-
EA
EA
REFERENCE
REFERENCE
1V
1V
SHUTDOWN
SHUTDOWN
& THERMAL
& THERMAL
Figure 3. Soft-start and Overload Hiccup Control Circuit
R
R
2mA
2mA
I C
I C
A1
A1
OSCILLATOR
OSCILLATOR
+
+
1.9V
1.9V
-
-
1.9V
1.9V
SLOPE
SLOPE
COMP
COMP
1.23V
1.23V
R
R
Figure 2. SC4525A Block Diagram
I D
I D
3.5mA
3.5mA
+
+
1V/2.15V
1V/2.15V
FAULT
FAULT
S
S
+
+
-
-
B4
B4
+
+
B1
B1
+
+
-
-
PWM
PWM
SOFT-START
SOFT-START
OVERLOAD
OVERLOAD
CONTROL
CONTROL
HICCUP
HICCUP
AND
AND
OC
OC
CLK
CLK
S
S
R
R
Q
Q
S
S
R
R
Q
Q
_
_
B2
B2
B3
B3
ILIM
ILIM
Q
Q
S
S
R
R
+
+
-
-
20mV
20mV
ISEN
ISEN
OVERLOAD
OVERLOAD
OC
OC
PWM
PWM
+
+
-
-
BST
BST
8
8
GND
GND
SW
SW
IN
IN
2
2
1
1
4
4
TRANSISTOR
TRANSISTOR
POWER
POWER
4.1mW
4.1mW
SC4525A
6
1 1
1 1