SC2440TETRT Semtech, SC2440TETRT Datasheet - Page 25

• Manufacturer Part Number: SC2440TETRT
• Description: IC SW REG DUAL 2.5MHZ 16-TSSOP
• Manufacturer: Semtech
• Type: Step-Down (Buck)r

Specifications of SC2440TETRT

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 2
• Current - Output: 2A
• Frequency - Switching: 1.4MHz
• Voltage - Input: 2.8 ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Power - Output: -
• Other names: SC2440TETR

POWER MANAGEMENT
Typical Application Circuits
2005 Semtech Corp.
Figure 19(a). 540KHz 20V to 5V and 1.8V Step-down Converter. Notice that Channel 2 is Bootstrapped
Figure 19(b). Switching Waveforms.
V
IN
CH1 : SW1 Voltage, 10V/div
CH2 : SW2 Voltage, 10V/div
= 20V
CH1
from OUT1. This Bootstrapping Scheme Requires OUT1 to be Present at All Times (i.e. No Hiccup
or Shutdown). Channel 2 will still Run if OUT1 is Absent. However its Power Disspation will be High.
CH2
1 s/div
11.8K
22.1K
33nF
C10
33nF
C7
R5
R7
10pF
10pF
C6
C9
C15 : 25V El ectrol ytic
All Other Capacitor are C eramic.
51.1K
2.2nF
4.7nF
C5
R9
C8
100K
R6
I
I
OUT1
OUT2
SS1
ROSC
SS2
PGOOD1
COMP1
SYNC
COMP2
FB2
GND
= 1A
= 1A
SC2440
FB1
PGOOD2
BOOST1
BOOST2
SW1
SW2
IN
100K
R8
1N4148
D4
20V
VIN
L1 : Coiltronic DR74
L2 : Coiltronic DR73
0.1 F
C2
25
47 F
C16
C15
1 F
0.1 F
1N4148
C4
Figure 19(c). V
D3
UPS140
UPS140
D1
D2
6.8 H
15 H
L2
L1
10 F
X 2
C1
C3
10 F
X 2
Upper Trace : V
Middle Trace : V
Lower Trace : V
IN
R1
205K
51.1K
40.2K
49.9K
R2
R3
R4
Start Up Transient. I
C11
33pF
C12
10pF
C13
68pF
4ms/div
1.8V/2A
OUT1
5V/2A
OUT2
OUT2
IN
OUT1
, 10V/div
, 2V/div
, 1V/div
OUT1
www.semtech.com
SC2440
= I
OUT2
= 1.5A.