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PDF MAX1544 Data sheet ( Hoja de datos )
| Número de pieza | MAX1544 | |
| Descripción | Dual-Phase / Quick-PWM Controller for AMD Hammer CPU Core Power Supplies | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1544 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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19-2745; Rev 1; 9/03
EVAALVUAAILTAIOBNLEKIT Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
General Description
The MAX1544 is a dual-phase, Quick-PWM™, step-
down controller for AMD Hammer™ CPU core supplies.
Dual-phase operation reduces input ripple current
requirements and output voltage ripple while easing
component selection and layout difficulties. The Quick-
PWM control scheme provides instantaneous response
to fast load-current steps. The MAX1544 includes active
voltage positioning with adjustable gain and offset,
reducing power dissipation and bulk output capacitance
requirements.
The MAX1544 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 this
device to directly step down high-voltage batteries for the
highest possible efficiency. Alternatively, two-stage con-
version (stepping down the 5V system supply instead of
the battery) at a higher switching frequency provides the
minimum possible physical size.
The MAX1544 complies with AMD’s desktop and
mobile CPU specifications. The switching regulator fea-
tures soft-start and power-up sequencing, and
soft-shutdown. The MAX1544 also features indepen-
dent four-level logic inputs for setting the suspend volt-
age (S0–S1).
The MAX1544 includes output undervoltage protection,
thermal protection, and voltage regulator power-OK
(VROK) output. When any of these protection features
detect a fault, the controller shuts down. Additionally, the
MAX1544 includes selectable overvoltage protection.
The MAX1544 is available in a low-profile, 40-pin 6mm
x 6mm thin QFN package. For other CPU platforms,
refer to the pin-to-pin compatible MAX1519/MAX1545
and MAX1532/MAX1546/MAX1547 data sheets.
Applications
AMD Hammer Desktop or Notebook PCs
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
Features
o Dual-Phase, Quick-PWM Controller
o ±0.75% VOUT Accuracy Over Line, Load, and
Temperature (1.3V)
o Active Voltage Positioning with Adjustable Gain
and Offset
o 5-Bit On-Board DAC: 0.675V to 1.55V Output
Adjust Range
o Selectable 100kHz/200kHz/300kHz/550kHz
Switching Frequency
o 4V to 28V Battery Input Voltage Range
o Adjustable Slew-Rate Control
o Drives Large Synchronous Rectifier MOSFETs
o Selectable Output Overvoltage Protection
o Undervoltage and Thermal-Fault Protection
o Power Sequencing and Timing
o Selectable Suspend Voltage
o Soft-Shutdown
o Selectable Single- or Dual-Phase Pulse Skipping
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1544ETL -40°C to +100°C 40 Thin QFN 6mm ✕ 6mm
TOP VIEW
Pin Configuration
TIME
TON
SUS
S0
S1
SHDN
OFS
REF
ILIM
VCC
1
2
3
4
5
6
7
8
9
10
MAX1544
30 VDD
29 DLM
28 DHM
27 LXM
26 BSTM
25 VROK
24 D0
23 D1
22 D2
21 D3
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Hammer is a trademark of AMD.
THIN QFN
________________________________________________________________ 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  
Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = VSHDN = VTON = VSKIP = VS0 = VS1 = VOVP = 5V, VFB = VCMP = VCMN = VCSP = VCSN =
1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Current-Balance
Transconductance
GATE DRIVERS
DH_ Gate-Driver On-Resistance
DL_ Gate-Driver On-Resistance
Gm(IBAL)
RON(DH)
RON(DL)
BST_ - LX_ forced to 5V
High state (pullup)
Low start (pulldown)
400 µS
1.0 4.5
1.0 4.5
0.4 2
Ω
Ω
DH_ Gate-Driver Source/Sink
Current
IDH
DH_ forced to 2.5V,
BST_ - LX_ forced to 5V
1.6 A
DL_ Gate-Driver Sink Current
IDL(SINK) DL_ forced to 5V
DL_ Gate-Driver Source Current IDL(SOURCE) DL_ forced to 2.5V
Dead Time
tDEAD
DL_ rising
DH_ rising
VOLTAGE-POSITIONING AMPLIFIER
Input Offset Voltage
VOS
Input Bias Current
IBIAS
OAIN+, OAIN-
Op Amp Disable Threshold
VOAIN-
4A
1.6 A
35
ns
26
-1 +1
0.1 200
3
VCC - 1
VCC -
0.4
mV
nA
V
Common-Mode Input Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing
Input Capacitance
Gain-Bandwidth Product
Slew Rate
Capacitive-Load Stability
LOGIC AND I/O
SHDN Input High Voltage
SHDN Input Low Voltage
SHDN No-Fault Threshold
OVP Input High Voltage
OVP Input Low Voltage
Three-Level Input Logic Levels
Logic Input Current
D0–D4 Logic Input High Voltage
VCM
CMRR
PSRR
AOA
Guaranteed by CMRR test
VOAIN+ = VOAIN- = 0 to 2.5V
VCC = 4.5V to 5.5V
RL = 1kΩ to VCC/2
|VOAIN+ - VOAIN-| ≥ 10mV,
RL = 1kΩ to VCC/2
VCC - VFBH
VFBL
No sustained oscillations
VIH
VIL
V SHDN
To enable no-fault mode
High
SUS, SKIP
REF
Low
SHDN, SKIP, SUS, OVP
0 2.5 V
70 115
dB
75 100
dB
80 112
dB
77 300
mV
47 200
11 pF
3 MHz
0.3 V/µs
400 pF
0.8 V
0.4 V
12 15 V
2.4 V
0.8 V
2.7
1.2 2.3 V
0.8
-1 +1 µA
1.6 V
_______________________________________________________________________________________ 5
5 Page 
Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VCC = VDD = 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 set for 1V
(SUS = VCC), OFS = GND, TA = +25°C, unless otherwise specified.)
POWER-UP SEQUENCE
MAX1544 toc18
5V
A
0
2V
1V B
0
5V
C
0
1ms/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 1V/div
C. VROK, 5V/div
RTIME = 64.9kΩ
SOFT-START
MAX1544 toc19
5V
A
0
1.5V
B
0
10A
0
0
100µs/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 1V/div
C. IL1, 10A/div
D. IL2, 10A/div
RLOAD = 75mΩ, RTIME = 64.9kΩ
C
D
SOFT-SHUTDOWN
MAX1544 toc20
5V
A
0
1.5V
B
0
10A
C
10A
0D
200µs/div
A. SHDN, 5V/div
B. 1.5V OUTPUT, 1V/div
C. IL1, 10A/div
D. IL2, 10A/div
RLOAD = 75mΩ, RTIME = 64.9kΩ
1.50V LOAD TRANSIENT
(10A TO 50A LOAD)
MAX1544 toc21
50A
A
10A
1.5V B
20A
20A
0C
0D
20µs/div
A. LOAD CURRENT, (ILOAD = 10A TO 50A), 50A/div
B. OUTPUT VOLTAGE (1.50V NO LOAD), 100mV/div
C. IL1, 10A/div
D. IL2, 10A/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1544.PDF ] | |
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