SC2440 SEMTECH [Semtech Corporation], SC2440 Datasheet - Page 24

• Manufacturer Part Number: SC2440
• Description: 2.5 MHz Dual Switching Regulator with Integrated 2A Switches
• Manufacturer: SEMTECH [Semtech Corporation]

POWER MANAGEMENT
Typical Application Circuits
Figure 18(b). V
2005 Semtech Corp.
Figure 18(a). Producing an Output Lower than FB Voltage. 1.5MHz 5V to 2.5V and 0.8V Step-down Converter
CH3 : SS2 Voltage, 1V/div
CH1 : OUT1 Voltage, 0.5V/div
CH2 : OUT2 Voltage, 1V/div
CH4 : PGOOD2, 1V/div
R
IN
3
Start-up Transient (I
is a pre-load to shunt the current from R
CH1
2ms/div
14.7K
11.8K
22nF
C10
22nF
C7
R5
R7
10pF
10pF
C6
C9
12.1K
CH2
R9
CH3
CH4
470pF
470pF
C5
C8
SS1
ROSC
SS2
FB2
COMP1
SYNC
COMP2
PGOOD1
OUT1
GND
SC2440
FB1
= I
PGOOD2
BOOST1
BOOST2
L1 & L2: Sumi da CR43
OUT2
SW1
SW2
IN
= 1A).
100K
R8
1N4148
D4
0.1 F
VIN
C2
5V
24
4.7 F
C15
BAT-54
10
D3
0.1 F
C4
and R
UPS120
UPS120
D1
D2
1.8 H
1 H
L2
L1
11
-0.5
-1.0
-1.5
-2.0
0.0
before PGOOD1 releases SS2.
0.0
10 F
22 F
C1
C3
30.1K
8.06K
20K
R1
R2
R3
0.5
Load Regulation
Load Current (A)
30.1K
R10
R11
4.02K
2.5V/2A
0.8V/2A
OUT2
OUT1
1.0
1.5
OUT1
OUT2
www.semtech.com
SC2440
2.0