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PDF SC1159 Data sheet ( Hoja de datos )

Número de pieza SC1159
Descripción Programmable Synchronous DC/DC Hysteretic Controller
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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SC1159
Programmable Synchronous DC/DC
Hysteretic Controller with VRM 8.5 VID Range
POWER MANAGEMENT
Description
Features
The SC1159 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 SC1159 is ideal for implementing DC/DC
converters needed to power advanced microprocessors
such as Pentium® llI and Athlon®, in both single and mul-
tiple processor configurations. Inhibit, under-voltage lock-
out and soft-start functions are included for controlled
power-up.
SC1159 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.
‹ 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
‹ +1% tolerance over temperature
Applications
‹ Server Systems and Workstations
‹ Pentium® III Core Supplies
‹ AMD Athlon® Core Supplies
‹ Multiple Microprocessor Supplies
‹ Voltage Regulator Modules
The SC1159 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.
Typical Application Circuit
+5V
R2
1k
R4
1k
R5
*
R6
20k
C2
0.001
R1
*
U1
R3 SC1159CSW
* 1 IOUT
PWRGD 28
2 DROOP
VID0 27
3 OCP
VID1 26
4 VHYST
VID2 25
5 VREFB
C1
0.1 6 VSENSE
VID3 24
VID25 23
7 AGND
INHIBIT 22
R9
10k
R10
1k
R11
1k
PWRGD
"POWER GOOD"
C6
0.1
INHIB
"INHIBIT"
C7
0.1
L1
0.5uH
Cin
HF
Cin
Bulk
8 SOFTST
C3
+5V 0.1 9 N/C
C4
0.01
10 LODRV
11 LOHIB
12 DRVGND
13 LOWDR
14 DRV
C5
IOUTLO 21
LOSENSE 20
C8
0.033
HISENSE 19
BOOTLO 18
HIGHDR 17
Q1
FDB6035AL
R12
1.0
BOOT
VIN12V
16
+12V
15
C9
1.0
Q2
FDB7030BL
R14
1.6
C10
L2
1.0uH
Cout
Bulk
Cout
HF
+
Vin +5V/12V
_
+
1.05 to 1.825V
_
R7
R8 *
10k
*) for the values see specific application circuit somewhere else in the datasheet
Revision 3, December 2002
1
www.semtech.com

1 page




SC1159 pdf
SC1159
POWER MANAGEMENT
DC Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
High-Side Output Driver
Peak Output Current
Equivalent Output
Resistance
Low-Side Output Driver
IsrcHIGHDR duty cycle < 2%, tpw < 100us,
TJ = 125°C
IsinkHIGHDR
VBOOT - VBOOTLO = 6.5V, VHIGHDR = 1.5V (src),
or VHIGHDR = 5V (sink)
RsrcHIGHDR
TJ = 125°C
VBOOT - VBOOTLO = 6.5V, VHIGHDR = 6V
RsinkHIGHDR TJ = 125°C
VBOOT - VBOOTLO = 6.5V, VHIGHDR = 0.5V
Peak Output Current
Equivalent Output
Resistance
IsrcLOWDR
IsinkLOWDR
RsrcLOWDR
RsinkLOWDR
duty cycle < 2%, tpw < 100us,
TJ = 125°C
VDRV = 6.5V, VLOWDR = 1.5V (src), or
VLOWDR = 5V (sink)
TJ = 125°C
VDRV = 6.5V, VLOWDR = 6V
TJ = 125°C
VDRV = 6.5V, VLOWDR = 0.5V
AC Electrical Characteristics (Note 1)
Parameter
Hysteretic Comparators
Propagation Delay Time
from VSENSE to HIGHDR or
LOWDR (excluding
deadtime)
Output Drivers
HIGHDR rise/fall time
LOWDR rise/falltime
Overcurrent Protection
Comparator Propagation
Delay Time
Deglitch Time (Includes
comparator propagation
delay time)
Symbol
Conditions
tHCPROP
10mV overdrive,
1.3V Vref 1.8V
trHIGHDR
trHIGHDR
trLOWDR
tfLOWDR
CI = 9nF, VBOOT = 6.5v, VBOOTLO = grounded,
TJ =125°C
CI = 9nF, VDRV = 6.5V,
TJ =125°C
tOVPROP
tOVDGL
Min Typ Max Units
2
A
45
5
2
A
45
5
Min Typ Max Units
150 250 ns
60 ns
60 ns
1 µs
2 5 µs
2002 Semtech Corp.
5
www.semtech.com

5 Page





SC1159 arduino
POWER MANAGEMENT
Output Voltage Table
0 = GND, 1 = OPEN
VID25mV (2)
VID3 (1)
VID2 (1)
VID1 (1)
00 10
10 10
000 1
100 1
000 1
100 1
0000
10 0 0
0000
10 0 0
0 111
1111
0 111
1111
0 110
1 1 10
0 110
1 1 10
0 10 1
110 1
0 10 1
110 1
0 100
1 10 0
0 100
1 10 0
00 11
10 11
00 11
10 11
00 10
10 10
NOTE:
(1) VID (3:0) correspond to legacy VRM 8.4 voltage levels for 1.3V - 1.8V.
(2) VID 25mV provides a 25mV increment.
2002 Semtech Corp.
11
VIDO (1)
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
SC1159
VDC (V)
1.05
1.075
1.10
1.125
1.15
1.175
1.20
1.225
1.25
1.275
1.30
1.325
1.35
1.375
1.40
1.425
1.45
1.475
1.50
1.525
1.55
1.575
1.60
1.625
1.65
1.675
1.70
1.725
1.75
1.775
1.80
1.825
www.semtech.com

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