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PDF SC452 Data sheet ( Hoja de datos )
| Número de pieza | SC452 | |
| Descripción | Dual-Phase Single Chip IMVP-6 Vcore Power Supply | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC452 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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NOT RECOMMENDED FOR NEW DESIGN
SC452
Dual-Phase Single Chip
IMVP-6 Vcore Power Supply
POWER MANAGEMENT
Description
Features
The SC452 is a single chip high-performance PWM con-
troller designed to power advanced IMVP-6™ processors.
On-chip support is provided for all of the IMVP-6 require-
ments, including Active Voltage Positioning, Geyserville-3
VID transitions, VID-controlled Deeper Sleep voltage set-
ting, PSI# and DPRSL control, fast/slow C4 exit, and de-
fault Boot voltage.
The SC452 implements hysteretic control technology
which provides the fastest possible transient response
while avoiding the stability issues inherent to classical
PWM controllers. Semtech’s proprietary Combi-Sense®
technology provides a loss-less current sensing scheme
which is extremely robust and easy to lay out. Eliminat-
ing the sense resistors reduces costs and PCB area, plus
increases system efficiency. Integrated SmartDriver™
technology initially turns on the high side driver with ‘soft’
drive to reduce ringing, EMI, and capacitive turn-on of the
low side MOSFET, while also increasing overall efficiency.
Dual-Phase Solution with Integrated Drivers
Hysteretic Control for Fast Transient Response
Combi-Sense Provides Loss-Less Current Sensing
Dynamic Current Sharing
Active Voltage Positioning
True Differential Remote (die) Sensing
On-Chip Support for all IMVP-6 Power Management
Features
VID Programmed Deeper Sleep Voltage
Fast/Slow C4E Break-Event Support
Clock Enable (CLKEN#) Output
Delayed Power Good Signal with Blanking
Programmable Soft-Start and DAC Slew Control
Programmable OCP Threshold
Supports all Ceramic Decoupling Solutions
44 pin MLP (7x7)
Lead-free Package
Hysteretic operation adaptively reduces the SC452
switching frequency at light loads. Combined with an
automatic “power-save” mode which prevents negative
current flow in the low-side FET, system efficiency is sig-
nificantly enhanced during light loading conditions. The
SC452 changes from dual-phase to single-phase opera-
tion whenever PSI# asserts, providing optimal efficiency
across the entire power range.
Applications
IMVP-6/6+ Notebook PCs
Embedded Applications
Graphics and Other Processor Cores
A 7-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.300V to 1.500V range
required by the processor. The DAC slew rate is externally
programmed to minimize transient currents and audible
noise. True differential remote sensing provides accu-
rate point-of-load regulation at the processor die. Other
features include programmable soft-start, open-drain
IMVP6_PWRGD and CLKEN# outputs, dynamic current
sharing, over-voltage and programmable over-current pro-
tection. The SC452 is available in a space-saving 44 pin
MLP package.
February 22, 2006 1 www.semtech.com
1 page  
NOT RECOMMENDED FOR NEW DESIGN
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Condition
Remote Sense (FB+, FB-)
Input Impedance
Bandwidth(1)
Droop (DRP+, DRP-)
Input Bias Current
Gain
Droop Input Offset
Maximum Input Signal(1)
Bandwidth(1)
DRP+ = 1.5V, DRP- = 1.48V
(25°C only)
0 to 8-855°°CC
Error Amplifier (ERROUT)
Gain
Bandwidth(1)
Current Sensing (CS1+, CS1-, CS2+, CS2-, ISH)
CS1, 2 + CS1, 2 Bias Currents
CS+ = CS- = 1.5V
CS Gain for Switchingg
Maximum Input Signal(1)
CS Bandwidth(1)
Zero-Crossing Detector Offset
Low Pass Filter Corner
Frequency(1)
Min
2
9.5
-0.4
-0.5
20
0.8
2
52.47
450
2
-6
50
Typ
14
10
0
0
19
36.0
80
SC452
Max Units
kΩ
MHz
±1
10.5
0.4
0.5
μA
V/V
mV
mV
mV
MHz
MHz
±1 μA
36.36 V/V
mV
MHz
6 mV
125 kHz
© 2006 Semtech Corp.
5 United States Patent No. 6,441,597
5 Page 
NOT RECOMMENDED FOR NEW DESIGN
POWER MANAGEMENT
Block Diagram
SC452
DAC
VID
[6:0]
SS
FB-
FB+
DRP+
DRP-
CS1+
CS1-
CS2+
CS2-
ISH
CLSET
HYS
EN
VccA
AGND
DAC
+
-
+
-
ERROR AMP
ERROUT
- HYSTERETIC COMPARATOR
+ CO
+ CO1
-
I-limit
CO2
SELECT
CURRENT SENSE AMP
CS1
+
-
LP
FILTER
+
-
LP
+ FILTER -
-
CS2
CURRENT SENSE AMP
+
CS1
CS2
+
-
SELECT
SELECT
CS1
CS2
CL hi
CL lo
Hys hi
Hys_lo
CO
SELECT
PHASE
CCOOPNHNTATRSREOOLL
CO
DPRSLP
PSI#
DPRSTP
-
+
CO
I-limit
CL_hi
CL_lo
REFERENCE
EN &
UVLO
+
-
VID [6:0]
DAC
PWRGD
LOGIC
VREF
CLKEN#
HYS_hi
HYS_lo
DRIVERS 1,2
3ms
START UP
TIME
PWRGD
VIN 1,2
VPN 1,2
EN
VccA
CO 1 or
CO 2
CS 1 or
CS 2
CROSS
CONDUCTION
PROTECTION
ZERO
CROSSING
PGNDN
BST 1,2
TG 1,2
DRN 1,2
VS 1,2
BG 1,2
PGND 1,2
© 2006 Semtech Corp.
11 United States Patent No. 6,441,597
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SC452.PDF ] | |
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