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參數資料
| 型號： | SC2620SETRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual 2A, 30V Step-down Regulator with Programmable Frequency up to 1.4MHz |
| 中文描述： | 雙的2A，30V的降壓與可編程頻率可達1.4MHz的調節 |
| 文件頁數： | 1/26頁 |
| 文件大小： | 598K |
| 代理商： | SC2620SETRT |
1
www.semtech.com
SC2620
Dual 2A, 30V Step-down Regulator with
Programmable Frequency up to 1.4MHz
POWER MANAGEMENT
Description
The SC2620 is a constant frequency dual current-mode
switching regulator with integrated 2.3A, 30V switches.
Its switching frequency can be programmed up to 1.4MHz
per channel. Due to the SC2620’s high frequency
operation, small inductors and ceramic capacitors can be
used, resulting in very compact power supplies. The two
channels of the SC2620 operate at 180° out of phase for
reduced input voltage ripples.
Revision: December 20th, 2006
Features
Wide Input Voltage Range 2.8V to 30V
Up to 1.4MHz/Channel Programmable Switching
Frequency
Current-mode Control
Out of Phase Switching Reduces Ripple
Cycle-by-cycle Current-limiting
Independent Shutdown/soft-start Pins
Independent Hiccup Overload Protection
Channel 1 Power Good Indicator
Two 2.3A Integrated Switches
Thermal Shutdown
Thermally Enhanced SO-16 Lead Free Package
Fully WEEE and RoHS Compliant
Applications
XDSL and Cable Modems
Set-top Boxes
Point of Load Applications
CPE Equipment
DSP Power Supplies
Typical Application Circuit
Separate soft start/enable pins allow independent control
of each channel. Channel 1 power good indicator can be
used for output start up sequencing to prevent latch-up.
Current-mode PWM control achieves fast transient
response with simple loop compensation. Cycle-by-cycle
current limiting and hiccup overload protection reduce
power dissipation during overload.
C15
10
μ
F
SC2620
PGOOD1
GND
SS2
PVIN
SW1
FB2
COMP2
C9
33pF
R7
10.5k
BOOST1
C1
22
μ
F
BOOST2
SW2
L1
10
μ
H
C2
0.1
μ
F
L2
6.8
μ
H
C4
0.1
μ
F
SS1
ROSC
COMP1
FB1
C3
22
μ
F
D1
D2
UPS120
1.2V/2A
R4
R3
2.61k
R2
R1
C7
22nF
C10
22nF
C8
4.7nF
C6
47pF
R5
12.7k
C5
1.5nF
D4
1N4148
L1 & L2: Coiltronics DR73
OUT2
OUT1
3.3V/2A
D3
1N4148
9V-16V VIN
VIN
R9
46.4k
10
C16
0.1
μ
F
R10
C1 & C3: Murata GRM21BR60J226M
C15: Murata GRM32DR61E106K
Figure 1(a). 550kHz 9V-16V V
IN
to 3.3V and 1.2V Step-
down Converter.
Channel 1 reaches regulation.
Figure 1(b). V
Start-up Transient (I
= 1.5A, I
=
0.8A). Channel 2 start is delayed until
4ms/div
CH1 : OUT1 Voltage, 2V/div
CH2 : OUT2 Voltage, 1V/div
CH3 : SS2 Voltage, 2V/div
C H 1
C H 2
C H 3
V
IN
= 12V
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