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SC2677EVB-2 Datasheet

  • SC2677EVB-2

  • Dual Synchronous Voltage Mode Controller with Current Sharin...

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  • SEMTECH   SEMTECH

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Dual Synchronous Voltage Mode
Controller with Current Sharing Circuitry
POWER MANAGEMENT
Description
The SC2677 is a versatile 2 phase, synchronous, volt-
age mode PWM controller that may be used in two dis-
tinct ways. First, the SC2677 is ideal for applications
where point of use output power exceeds any single in-
put power budget. Alternatively, the SC2677 can be used
as a dual switcher. The SC2677 features a temperature
compensated voltage reference, an under voltage lock-
out over current protection and internal level-shifted, high-
side drive circuitry.
In current sharing configuration, the SC2677 can pro-
duce a single output voltage from two separate voltage
sources (which can be different voltage levels) while
maintaining current sharing between the channels. Cur-
rent sharing is programmable to allow loading each input
supply as required by the application.
In dual switcher configuration, two feedback paths are
provided for independent control of the separate outputs.
The device will provide a regulated output from flexibly
configured inputs (3.3V, 5V, 12V), provided 5V is present
for V
CC
. The phasing between the two switchers is ad-
justable to minimize the input and output ripple.
SC2677
Features
300kHz to 1MHz externally programmable
frequency operation
Soft Start and Enable function
Power Good output provided
Under voltage short circuit protection
Phase-shifted switchers minimize ripple
High efficiency operation, >90%
Programmable output(s) as low as 0.5V
Industrial temperature range
TSSOP-20 package
Bias voltage as low as 4.5V
Adjustable phase shift between channels
Tw o Phase, Current Sharing Controller
Flexible, same or separate V
IN
Programmable current sharing
Thermal distribution via multi-phase output
Applications
Graphics cards
Peripheral add-in card
Dual-Phase power supply
Power supplies requiring two outputs
Simplified Application Schematic
+5V
M1
C1
M2
C2
+12V
C3
L1
1
2
Vout1
PWRGD
ENABLE
R1
C5
R4
20
19
18
17
16
15
14
13
12
11
1uF
R2
R3
C4
P S
HA ING
S /E
S NA
-IN1
CO P
M 1
B T1
S
DH1
DL1
P RG
W D
B TC
S
G
ND
R5
R6
0R0
R7
U1
FRE
Q
V F
RE
+
IN2
V
CC
SC2677
CO P
M 2
P ND
G
B T2
S
DH2
-IN2
DL2
C6
10
R8
1
2
3
4
5
6
7
8
C7
R11
R10
+3.3V
C8
+12V
9
R9
L2
1
M3
C9
M4
C10
2
Vout2
Revision: NOV. 15, 2004
1
www.semtech.com

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