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ADP3208A PDF даташит

Спецификация ADP3208A изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «7-Bit Programmable Dual-Phase Mobile CPU Synchronous Buck Controller».

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Номер произв ADP3208A
Описание 7-Bit Programmable Dual-Phase Mobile CPU Synchronous Buck Controller
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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ADP3208A Даташит, Описание, Даташиты
7-Bit, Programmable, Dual-Phase, Mobile,
CPU, Synchronous Buck Controller
ADP3208A
FEATURES
General Description
Single-chip solution
Fully compatible with the Intel® IMVP-6+™ specifications
The ADP3208 is a highly efficient, multiphase, synchronous
buck switching regulator controller. With its integrated drivers,
Integrated MOSFET drivers
Selectable 1- or 2-phase operation with up to 1 MHz per
phase switching frequency
Guaranteed ±8 mV worst-case differentially sensed core
voltage error over temperature
Automatic power-saving mode maximizes efficiency with
light load during deeper sleep operation
the ADP3208 is optimized for converting the notebook battery
voltage into the core supply voltage required by high performance
Intel processors. An internal 7-bit DAC is used to read a VID code
directly from the processor and to set the CPU core voltage to a
value within the range of 0.3 V to 1.5 V. The phase relationship
of the output signals ensures interleaved 2-phase operation.
Soft transient control reduces inrush current and audio noise
Active current balancing between output phases
Independent current limit and load line setting inputs for
additional design flexibility
Built-in power good blanking supports
voltage identification (VID) on-the-fly transients
7-bit, digitally programmable DAC with 0.3 V to 1.5 V output
The ADP3208 uses a multimode architecture run at a program-
mable switching frequency and optimized for efficiency depending
on the output current requirement. The ADP3208 switches
between single- and dual-phase operation to maximize efficiency
with all load conditions. The chip includes a programmable
load line slope function to adjust the output voltage as a
Short-circuit protection with programmable latch-off delay
Clock enable output delays the CPU clock until the core
voltage is stable
Output power or current monitor options
48-lead LFCSP
ADP3208A version has 1.0V Boot voltage
APPLICATIONS
Notebook power supplies for next-generation Intel
processors
function of the load current so that the core voltage is always
optimally positioned for a load transient. The ADP3208 also
provides accurate and reliable short-circuit protection, adjustable
current limiting, and a delayed power good output. The IC
supports on-the-fly output voltage changes requested by the
CPU.
ADP3208 is specified over the extended commercial
temperature range of 0°C to 100°C and is available in a 48-lead
LFCSP
FUNCTIONAL BLOCK DIAGRAM
RAMP VRPM RPM RT
SP
PSI
VID6, VID5,
VID4, VID3,
VID2, VID1,
VID0
ST
VARFREQ
DPRSTP
DPRSLP
SS
PWRGD
PGDELAY
CLKEN
EN
VCC
GND
RAMP
GENER-
ATOR
OSCILLATOR
PWM
CMPS
PWM
LATCH
PHASE
CONTROL
DRV2
IN
OD2
VREF
SWITCH
AMPS
VID
DAC
VDAC
REFER-
ENCE
SELECT
FBRTN
CLREF
PSI
HOUSE-
KEEPING
CLTHSEL
OVTH
UVTH
REFTH BIAS
DRV1
IN
OD1B
OD1A
+
+
ERR AMP ++––
CSAMP
CLIM
CMP
+
+
SS
+–
+–
UVLO
REF
BIAS
ADP3208
VREF PMON
PWM
CSAVG
+
PMON PMONFS
VCC
BST2
DRVH2
SW2
PVCC2
DRVL2
PGND2
BST1
DRVH1
SW1
PVCC1
DRVL1
PGND1
COMP
FB
LLINE
CSCOMP
CSSUM
CSREF
CLIM
VRTT
TTSNS
FBRTN
Figure 1.
©2008 SCILLC. All rights reserved.
January 2008 – Rev. 2
Publication Order Number:
ADP3208A/D
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ADP3208A Даташит, Описание, Даташиты
ADP3208A
TABLE OF CONTENTS
Features...............................................................................................1
Applications .......................................................................................1
General Description..........................................................................1
Functional Block Diagram...............................................................1
Revision History................................................................................2
Specifications .....................................................................................3
Timing Diagram................................................................................7
Absolute Maximum Ratings ............................................................8
ESD Caution ..................................................................................8
Pin Configuration and Function Descriptions .............................9
Test Circuits .....................................................................................11
Typical Performance Characteristics............................................12
Theory of Operation.......................................................................15
Number of Phases .......................................................................15
Operation Modes ........................................................................15
Differential Sensing of Output Voltage ....................................18
Output Current Sensing .............................................................18
Active Impedance Control Mode .............................................18
Current Control Mode and Thermal Balance.........................19
Voltage Control Mode ................................................................19
Power Good Monitoring ............................................................19
Power-Up Sequence and Soft Start ...........................................19
Soft Transient...............................................................................20
Current Limit, Short-Circuit, and Latch-Off Protection.......20
Changing VID on the Fly...........................................................21
Output Crowbar ..........................................................................23
REVISION HISTORY
01/08—Rev 2: Conversion to ON Semiconductor
08/07—Rev Sp1: Changed to ADP3208A
10/05—Rev Sp0: Initial Version
Reverse Voltage Protection........................................................23
Output Enable and UVLO.........................................................23
Thermal Throttling Control......................................................23
Power Monitor Function ...........................................................24
Application Information ................................................................27
Setting the Clock Frequency for PWM....................................27
Setting the Switching Frequency for
RPM Operation of Phase 1 ........................................................27
Soft Start and Current Limit Latch-Off Delay Times ............27
PWRGD Delay Timer ................................................................28
Inductor Selection.......................................................................28
COUT Selection..............................................................................30
Power MOSFETs .........................................................................31
Ramp Resistor Selection ............................................................32
COMP Pin Ramp ........................................................................32
Current Limit Setpoint...............................................................32
Power Monitor ............................................................................33
Feedback Loop Compensation Design ....................................33
CIN Selection and Input Current di/dt Reduction ..................34
Soft Transient Setting .................................................................34
Selecting Thermal Monitor Components................................34
Tuning Procedure for ADP3208 ...............................................35
Layout and Component Placement..........................................36
Outline Dimension .........................................................................38
Ordering Guide ...........................................................................38
Rev. 2 | Page 2 of 38 | www.onsemi.com
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ADP3208A Даташит, Описание, Даташиты
ADP3208A
SPECIFICATIONS
VCC = PVCC1 = PVCC2 = BST1 = BST2 = high = 5 V, FBRTN = GND = SW1 = SW2 = PGND1 = PGND2 = low = 0 V, EN = VARFREQ =
high, DPRSLP = 0 V, PSI = 1.05 V, DPRSTP = 0 V, VVID = 1.2000 V, TA = 0°C to 100°C, unless otherwise noted.1 Current entering a pin
(sunk by the device) has a positive sign.
Table 1.
Parameter
Symbol Conditions
Min Typ Max Unit
VOLTAGE ERROR AMPLIFIER
Output Voltage Range
DC Accuracy
Boot Voltage
LLINE Positioning Accuracy
LLINE Input Bias Current
Differential Nonlinearity2
Line Regulation
Input Bias Current
FBRTN Current
Output Current
Gain Bandwidth Product2
Slew Rate2
VCOMP
VFB
VBOOT(FB)
ΔVFB
ILLINE
ΔVFB
IFB
IFBRTN
ICOMP
GBW
Relative to nominal VVID,
LLINE = CSREF
VVID = 0.5000 V to 1.5000 V
VVID = 0.3000 V to 0.4875 V
Start-up
LLINE − CSREF = −80 mV
LLINE − CSREF = −200 mV
VCC = 4.75 V to 5.25 V
FB forced to VVID − 3%
FB forced to VVID + 3%
COMP = FB
CCOMP = 10 pF
0.8 3.6 V
−8
−10
0.992
78
180
−80
−1
−1
1.0
80
200
0.005
60
−4
900
20
25
+8
+10
1.008
82
220
+80
+1
+1
400
mV
mV
V
mV
mV
nA
LSB
%
μA
μA
mA
μA
MHz
V/μs
VID DAC INPUTS
Input Low Voltage
Input High Voltage
Input Current
VID Transition Delay Time2
VIL
VIH
IIN(VID)
VID(x)
VID(x)
Sink current
VID code change to FB change
0.52 0.3
0.7 0.52
1
400
V
V
μA
ns
PWM OSCILLATOR
Frequency Range2
PSI = DPRSTP = 1.05 V, DPRSLP = 0 V
0.3
3 MHz
Frequency
fOSC TA = 25°C, RT = 250 kΩ, PWM mode, 400 kHz
VARFREQ = high, VVID = 1.5000 V
TA = 25°C, RT = 125 kΩ, PWM mode, 750 kHz
VARFREQ = high, VVID = 1.5000 V
RT Voltage
VRT
RT = 250 kΩ to GND, VVID = 1.5000 V
1.08 1.25 1.32 V
VARFREQ = low
VRPM Reference Voltage
VVRPM
IVRPM = 0
0.95 1
1.05 V
IVRPM = 120 μA
0.95 1
1.16 V
RPM Output Current
IRPM VVID = 1.5000 V, RT = 250 kΩ
−5 μA
RPM Comparator Offset
VOS(RPM)
|VCOMP − VRPM|, PSI = 0 V
−20 −1
+15 mV
RAMP Input Voltage
VRAMP
0.9 1.0 1.1 V
RAMP Input Current Range
IRAMP
EN = high
1 50 μA
RAMP Input Current in Shutdown
EN = low or UVLO, RAMP = 19 V
1 μA
CURRENT SENSE AMPLIFIER
Offset Voltage
Input Bias Current
Input Common-Mode Range2
Output Voltage Range
Output Current
VOS(CSA)
ICSSUM
VCSCOMP
ICSCOMP
CSSUM − CSREF
CSSUM and CSREF
Sink current
Source current
Rev. 2 | Page 3 of 38 | www.onsemi.com
−2.0
−65
0
0.05
1
−15
+2.0 mV
+65 nA
3.5 V
2.7 V
mA
mA
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