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SC2620SETRT Datasheet

  • SC2620SETRT

  • Dual 2A, 30V Step-down Regulator with Programmable Frequency...

  • 26頁

  • SEMTECH   SEMTECH

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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鈥檚 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擄 out of phase for
reduced input voltage ripples.
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.
SC2620
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
R5
C5
FB1
COMP1 BOOST1
SS1
22nF
R9
46.4k
SW1
ROSC
9V-16V VIN
C15
R10 10碌F
10
VIN
C9
COMP2
C8
R7 33pF
10.5k
4.7nF
FB2
BOOST2
GND
SW2
D4
1N4148
C4
0.1碌F
C16
0.1碌F
D2
UPS120
L2
6.8碌H
C3
22碌F
OUT2
R3 1.2V/2A
2.61k
R4
13k
D3
C2
1N4148
0.1碌F
L1
10碌H
D1
UPS120
C1
22碌F
R1
30.1k
R2
13k
12.7k C6 1.5nF
C7 47pF
V
IN
= 1 2 V
OUT1
3.3V/2A
CH1
SC2620
PGOOD1
PVIN
CH2
C10
SS2
22nF
CH3
4ms/div
CH1 : OUT1 Voltage, 2V/div
CH2 : OUT2 Voltage, 1V/div
CH3 : SS2 Voltage, 2V/div
Figure 1(b). V
IN
Start-up Transient (I
OUT1
= 1.5A, I
OUT2
=
0.8A). Channel 2 start is delayed until
Channel 1 reaches regulation.
L1 & L2: Coiltr onics DR73
C1 & C3: Murata GRM21BR60J 226M
C15: Murata GRM32DR61E106K
Figure 1(a). 550kHz 9V-16V V
IN
to 3.3V and 1.2V Step-
down Converter.
Revision: December 20th, 2006
1
www.semtech.com

SC2620SETRT 產品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器

  • -

  • 降壓（降壓）

  • 可調式

  • 2

  • 可調

  • 2.8 V ~ 30 V

  • 電流模式

  • 最高 1.4MHz

  • 2A

  • 無

  • -40°C ~ 105°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 帶卷 (TR)

  • 16-SO

  • SC2620SETR

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