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PDF MAX8707 Data sheet ( Hoja de datos )
| Número de pieza | MAX8707 | |
| Descripción | Fixed-Frequency Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3360; Rev 0; 8/04
Multiphase, Fixed-Frequency Controller forwww.DataSheet4U.com
AMD Hammer CPU Core Power Supplies
General Description
The MAX8707 is a multiphase (3-/4-phase), interleaved,
fixed-frequency, step-down controller for AMD Hammer
CPU core supplies. Interleaved multiphase operation
reduces the input ripple current and output voltage ripple
while easing component selection and layout placement.
The MAX8707 includes active voltage positioning with
adjustable gain and offset, reducing power dissipation
and bulk output-capacitance requirements.
The MAX8707 is intended for two different notebook
CPU core applications: stepping down the battery
directly or stepping down the +5V system supply to
create the core voltage. The single-stage conversion
method allows these devices to directly step down
high-voltage batteries for the highest possible efficien-
cy. Alternatively, 2-stage conversion (stepping down
the +5V system supply instead of the battery) at higher
switching frequency provides the minimum possible
physical size.
The MAX8707 features dedicated differential current-
sense inputs for each phase and includes a fifth pair of
current-sense inputs to provide an accurate voltage-
positioning slope and average current-limit protection
using a single current-sense resistor. The MAX8707 also
has two dedicated inputs that provide differential remote
voltage sensing.
The MAX8707 provides an analog input for setting the
suspend voltage and a slew-rate controller for transi-
tions between VID codes or the suspend voltage. The
controllers reduce the transition slew rate during startup
and shutdown, providing soft-start with minimal input
surge current and damped soft-shutdown without nega-
tive output undershoot. The MAX8707 includes output
fault protection—undervoltage, nonlatched overvoltage,
and thermal overload—and an independent voltage-
regulator power-OK (VROK) output.
The MAX8707 has a selectable switching frequency,
allowing 200kHz, 300kHz, or 600kHz per-phase opera-
tion. The MAX8707 is available in the low-profile, 40-pin,
6mm x 6mm thin QFN package. Refer to the MAX8702/
MAX8703 for compatible drivers.
Features
o 3-/4-Phase Interleaved Fixed-Frequency
Controller
o ±0.75% VOUT Accuracy Over Line, Load, and
Temperature
o 5-Bit On-Board Digital-to-Analog Converter
(DAC)—0.80V to 1.55V
o Adjustable Suspend Voltage Input
o Active Voltage Positioning with Adjustable Gain
and Offset
o Accurate Lossless Current Balance
o Accurate Droop and Current Limit
o Remote Output and Ground Sense
o Output Slew-Rate Control
o Power-Good Window Comparator
o Selectable 200kHz/300kHz/600kHz Switching
Frequency
o Output Overvoltage and Undervoltage Protection
o Thermal Fault Protection
o 2V ±0.7% Reference Output
o Soft-Startup and Shutdown
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8707ETL -40°C to +85°C 40 Thin QFN 6mm x 6mm
Applications
AMD Hammer Desknote Computers
Multiphase CPU Core Supplies
Voltage-Positioned Step-Down Converters
Notebook/Desktop Computers
Servers
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Multiphase, Fixed-Frequency Controller forwww.DataSheet4U.com
AMD Hammer CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. VCC = VSHDN = 5V, OSC = REF, VVPS = VFBS = VCRSN = VCRSP = VCSP_ = 1.20V, VSUSV = 0.8V, OFS = SUS =
GNDS = PGND = SKIP = GND, D0–D4 set for 1.20V (D0–D4 = 01110). TA = 0°C to +85°C, unless otherwise specified. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ILIM(PK) Idle Current-Limit
Threshold Voltage (Skip Mode)
Current-Sense Input Current
VIDLE
CSP_ - CSN_, VSKIP ≥ 1.2V,
RILIM(PK) = RTRC x 8V / VPKLIMIT,
VPKLIMIT = 50mV
CSP_, CRSP
CSN_, CRSN
2 5 8 mV
-0.2 +0.2
µA
-1.0 +1.0
Current-Sense Common-Mode
Input Range
CRSP, CRSN, CSP_, CSN_
0 2V
Phase Disable Threshold
CSP4
3
VCC - 1
VCC -
0.4
V
CRS Sense Input Disable
Threshold
CRSP
3
VCC - 1
VCC -
0.4
V
LOGIC AND I/O
Logic Input High Voltage
Logic Input Low Voltage
SHDN No-Fault Threshold
D0–D4 Logic Input High Voltage
D0–D4 Logic Input Low Voltage
VIH SHDN, SUS
VIL SHDN, SUS
To enable no-fault mode
2.4 V
0.8 V
11 13 V
0.8 V
0.4 V
OSC 3-Level Input Logic Levels
SKIP Input Logic Levels
Logic Input Current
VOSC
VSKIP
High (VCC)
Medium (REF)
Low (GND)
High
Low (GND)
SHDN, SKIP, SUS, OSC, D0–D4 = 0 to 5V
VCC -
0.4
1.8
1.2
-1
V
2.2
0.4
V
0.8
+1 µA
Logic Output High Voltage
Logic Output Low Voltage
VOH
VOL
PWM_, DRSKP; ISOURCE = 3mA
PWM_, DRSKP; ISINK = 3mA
VCC -
0.4
V
0.4 V
_______________________________________________________________________________________ 5
5 Page 
Multiphase, Fixed-Frequency Controller forwww.DataSheet4U.com
AMD Hammer CPU Core Power Supplies
Typical Operating Characteristics (continued)
(Circuit of Figure 1. VIN = 12V, VCC = 5V, SUS = SKIP = GND, SHDN = VCC, VSUSV = 0.80V, TA = +25°C, unless otherwise specified.)
65A
10A
1.30V
LOAD TRANSIENT
(VOUT = 1.30V)
MAX8707 toc16
A
B
30A
0
1.00V
LOAD TRANSIENT
(VOUT = 1.00V)
MAX8707 toc17
A
B
70A
0A
1.30V
TRANSIENT PHASE REPEAT
MAX8707 toc18
A
B
12V
C
0
20A D
10A
0
20µs/div
A. IOUT = 10A TO 65A,
50A/div
B. VOUT, 100mV/div
C. LX1, 10V/div
D. INDUCTOR CURRENT
(IL1), 10A/div
12V
C
0
10A D
0
20µs/div
A. IOUT = 0 TO 30A,
50A/div
B. VOUT, 50mV/div
C. LX1, 10V/div
D. INDUCTOR CURRENT
(IL1), 10A/div
20V
C
0
20A
10A D
0 VIN = 20V
2µs/div
A. IOUT = 0 TO 70A,
100A/div
B. VOUT, 100mV/div
C. LX1, 10V/div
D. INDUCTOR CURRENT
(IL1), 10A/div
DEEP-SLEEP TRANSITION
MAX8707 toc19
3.3V
0
0.2V
0
1.300V
A
B
C
1.275V
5A
5A
D
E
IOUT = 20A
20µs/div
A. DPSLP, 5V/div
B. OFS, 200mV/div
C. VOUT, 25mV/div
D. INDUCTOR CURRENT
(IL1), 10A/div
E. INDUCTOR CURRENT
(IL3), 10A/div
3.3V
0
1.30V
0.80V
5V
0
SUSPEND EXIT TRANSITION
MAX8707 toc20
A
B
C
D
E
3.3V
0
1.30V
0.80V
5V
0
SUSPEND TRANSITION
(SKIP = SUS)
MAX8707 toc21
A
B
C
D
E
20µs/div
A. SUS, 5V/div
B. VOUT, 500mV/div
C. DRSKP, 5V/div
D. INDUCTOR CURRENT
(IL1), 10A/div
E. INDUCTOR CURRENT
(IL3), 10A/div
200µs/div
A. SUS, 5V/div
B. VOUT, 500mV/div
C. DRSKP, 5V/div
D. INDUCTOR CURRENT
(IL1), 10A/div
E. INDUCTOR CURRENT
(IL3), 10A/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX8707.PDF ] | |
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