ChipFind - документация

Электронный компонент: FAN5029

Скачать:  PDF   ZIP
2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
December 2005
FAN5029 Product Brief Rev. 1.0.0
F
AN5029 8-Bit Pr
ogrammab
le 2- to 5-Phase Sync
hr
onous Buc
k Contr
oller
FAN5029
8-Bit Programmable 2- to 5-Phase Synchronous
Buck Controller
Features
Selectable 2-, 3-, 4-, or 5-phase operation at up to
1 MHz per phase
8 mV worst-case differential sensing error over
temperature
Logic-level PWM outputs for interface to external
high-power drivers
Active current balancing between all output phases
Built-in power good/crowbar blanking supports on-the-
fly VID code changes
Digitally programmable 0.5 V to 1.6 V output supports
both VR10 and VR11 specifications
Programmable short circuit protection with program-
mable latch-off delay
Applications
Desktop PC/Server power supplies for next generation
Intel processors
VRM modules
Description
The FAN5029 is a highly efficient multi-phase synchro-
nous buck switching regulator controller optimized for
converting a 12V main supply into the core supply volt-
age required by high performance Intel processors. It
uses an internal 8-bit DAC to read voltage identification
(VID) code directly from the processor, which is used to
set the output voltage between 0.5V and 1.6V. It uses a
multi-mode PWM architecture to drive the logic-level out-
puts at a programmable switching frequency that can be
optimized for VR size and efficiency. The phase relation-
ship of the output signals can be programmed to provide
2-, 3-, 4-, or 5-phase operation, allowing for the construc-
tion of up to five complementary buck switching stages.
The FAN5029 also includes programmable no-load off-
set and slope functions to adjust the output voltage as a
function of the load current, so that it is always optimally
positioned for a system transient. The FAN5029 also pro-
vides accurate and reliable short circuit protection,
adjustable current limiting, and a delayed Power Good
output that accommodates on-the-fly output voltage
changes requested by the CPU.
FAN5029 is specified over the extended commercial
temperature range of 0C to +85C and is available in a
40-lead MLP package.
Related Products
FAN5109MX
Dual Bootstrapped 12V MOSFET Driver
FAN5068
DDR-1/DDR-2 plus ACPI Regulator Combo
FAN5069
PWM and LDO Controller Combo
FAN6520A
Single Synchronous Buck PWM Controller
For more information, please contact
Ron Berthiaume at
ronald.berthiaume@fairchildsemi.com
2
www.fairchildsemi.com
FAN5029 Product Brief Rev. 1.0.0
F
AN5029 8-Bit Pr
ogrammab
le 2- to 5-Phase Sync
hr
onous Buc
k Contr
oller
Block Diagram
VCC
PRECISION
REFERENCE
DELAY
UVLO
SHUTDOWN
& BIAS
+
GND
18
EN
1
DELAY
7
ILIMIT
11
PWRGD
2
31
RAMPADJ
13
RT
12
PWM2
29
PWM3
28
PWM4
27
SW3
23
SW2
24
SW1
25
CSREF
15
CSCOMP
SW4
22
SW5
21
CSSUM
16
PWM1
OD
VID5
34
VID7
32
VID6
33
VID4
35
VID3
36
VID2
37
VID0
39
VID1
38
3
COMP
FBRTN
40
VIDSEL
5
VID
DAC
DAC+150mV
+
850mV
+
DAC-250mV
+
CSREF
CURRENT
LIMIT
CIRCUIT
CROWBAR
CURRENT
LIMIT
+
CMP
+
CMP
+
CMP
+
+
CMP
+
CMP
PWM5
26
CURRENT
BALANCING
CIRCUIT
2 / 3 / 4 / 5-PHASE
DRIVER LOGIC
EN
SET
RESET
RESET
RESET
RESET
RESET
30
19
17
THERMAL
THROTTLING
CONTROL
TTSENSE
10
VRHOT
9
VRFAN
8
OSCILLATOR
+
SS
6
Boot Control
LLSET
14
DAC
BUFF
FB
4
+
Z
STARTUP
CONTROL
FAN5029
3
www.fairchildsemi.com
FAN5029 Product Brief Rev. 1.0.0
F
AN5029 8-Bit Pr
ogrammab
le 2- to 5-Phase Sync
hr
onous Buc
k Contr
oller
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY
ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT
CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
LIFE SUPPORT POLICY
FAIRCHILDS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, or (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Preliminary
No Identification Needed
Obsolete
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Formative or
In Design
First Production
Full Production
Not In Production
ISOPLANARTM
LittleFETTM
MICROCOUPLERTM
MicroFETTM
MicroPakTM
MICROWIRETM
MSXTM
MSXProTM
OCXTM
OCXProTM
OPTOLOGIC
OPTOPLANARTM
PACMANTM
POPTM
Power247TM
PowerEdgeTM
FAST
FASTrTM
FPSTM
FRFETTM
GlobalOptoisolatorTM
GTOTM
HiSeCTM
I
2
CTM
i-LoTM
ImpliedDisconnectTM
IntelliMAXTM
Rev. I17
ACExTM
ActiveArrayTM
BottomlessTM
Build it NowTM
CoolFETTM
CROSSVOLTTM
DOMETM
EcoSPARKTM
E
2
CMOSTM
EnSignaTM
FACTTM
FACT Quiet SeriesTM
PowerSaverTM
PowerTrench
QFET
QSTM
QT OptoelectronicsTM
Quiet SeriesTM
RapidConfigureTM
RapidConnectTM
SerDesTM
ScalarPumpTM
SILENT SWITCHER
SMART STARTTM
SPMTM
StealthTM
SuperFETTM
SuperSOTTM-3
SuperSOTTM-6
SuperSOTTM-8
SyncFETTM
TinyLogic
TINYOPTOTM
TruTranslationTM
UHCTM
UltraFET
UniFETTM
VCXTM
WireTM
Across the board. Around the world.TM
The Power Franchise
Programmable Active DroopTM