MAX1544 Datasheet, PDF (1/42 Pages) Maxim Integrated Products – Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies

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% V_OUT 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 1
TON 2
SUS 3
S0 4
S1 5
SHDN 6
OFS 7
REF 8
ILIM 9
V_CC 10
MAX1544
30 V_DD
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.