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SC2659SWTR Datasheet

  • SC2659SWTR

  • Programmable Synchronous DC/DC Hysteretic Controller with VR...

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  • 20頁(yè)

  • SEMTECH   SEMTECH

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Programmable Synchronous DC/DC
Hysteretic Controller with VRM 8.5 VID Range
POWER MANAGEMENT
Description
The SC2659 is a synchronous-buck switch-mode con-
troller designed for use in single ended power supply ap-
plications where efficiency is the primary concern. The
controller is a hysteretic type, with a user selectable hys-
teresis. The SC2659 is ideal for implementing DC/DC
converters needed to power advanced microprocessors
such as Pentium
廬
llI and Athlon
廬
, in both single and mul-
tiple processor configurations. Inhibit, under-voltage lock-
out and soft-start functions are included for controlled
power-up.
SC2659 features include an integrated 5 bit D/A con-
verter, temperature compensated voltage reference,
current limit comparator, over-current protection, and an
adaptive deadtime circuit to prevent shoot-through of
the power MOSFET during switching transitions. Power
good signaling, logic compatible shutdown, and over-volt-
age protection are also provided. The integrated D/A
converter provides programmability of output voltage
from 1.050V to 1.825V in 25mV increments.
The SC2659 high side driver can be configured as either
a ground-referenced or as a floating bootstrap driver.
The high and low side MOSFET drivers have a peak cur-
rent rating of 2 amps.
SC2659
Features
Programmable hysteresis
5 bit DAC programmable output (1.050V-1.825V)
On-chip power good and OVP functions
Designed to meet latest Intel specifications
Up to 95% efficiency
VIDs pulled up to +3.3V
Applications
Server Systems and Workstations
Pentium
廬
III Core Supplies
AMD Athlon
廬
Core Supplies
Multiple Microprocessor Supplies
Voltage Regulator Modules
Typical Application Circuit
+5V
R1
*
R3
*
R2
1k
2
DROOP
VID0
27
U1
SC2659
1
IOUT
PWRGD
28
R9
10k
R10
1k
PWRGD
"POWER GOOD"
C6
0.1
R4
1k
INHIB
3
OCP
VID1
26
"INHIBIT"
R11
1k
C7
0.1
4
VHYST
VID2
25
R5
*
C1
0.1
C2
0.001
5
VREFB
VID3
24
L1
0.5uH
R6
20k
6
VSENSE
VID25
23
+
Cin
HF
Cin
Bulk
7
AGND
INHIBIT
22
Vin +5V/12V
8
SOFTST
IOUTLO
21
_
C8
0.033
C3
0.1
+5V
9
N/C
LOSENSE
20
10
LODRV
HISENSE
19
C4
0.01
11
LOHIB
BOOTLO
18
Q1
FDB6035AL
R12
1.0
12
DRVGND
HIGHDR
17
13
LOWDR
BOOT
16
+12V
L2
1.0uH
C9
1.0
Q2
FDB7030BL
R14
1.6
Cout
Bulk
Cout
HF
+
14
DRV
VIN12V
15
1.05 to 1.825V
C5
C10
_
R8
10k
R7
*
*) for the values see specific application circuit somewhere else in the datasheet
Revision: December 10, 2003
1
www.semtech.com

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