MAX8760 Datasheet, PDF (1/39 Pages) Maxim Integrated Products – Dual-Phase, Quick-PWM Controller for AMD Mobile Turion 64 CPU Core Power Supplies

19-3721; Rev 0; 5/05
Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
General Description
The MAX8760 is a dual-phase, Quick-PWM™, step-
down controller for 6-bit VID AMD Mobile Turion™ 64
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 MAX8760
includes active voltage positioning with adjustable gain
and offset, reducing power dissipation and bulk output
capacitance requirements.
The MAX8760 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 MAX8760 complies with AMD’s desktop and mobile
CPU specifications. The switching regulator features soft-
start and power-up sequencing, and soft-shutdown. The
MAX8760 also features independent four-level logic inputs
for setting the suspend voltage (S0, S1).
The MAX8760 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.
The MAX8760 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 MAX1544, MAX1519/MAX1545,
and MAX1532/MAX1546/MAX1547 data sheets.
Applications
6-Bit VID AMD Mobile Turion 64 CPU
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
Features
♦ Dual-Phase, Quick-PWM Controller
♦ ±0.75% V_OUT Accuracy Over Line, Load, and
Temperature (1.3V)
♦ Active Voltage Positioning with Adjustable Gain
and Offset
♦ 6-Bit On-Board DAC: 0.375V to 1.55V Output
Adjust Range
♦ Selectable 100kHz/200kHz/300kHz/550kHz
Switching Frequency
♦ 4V to 28V Battery Input Voltage Range
♦ Adjustable Slew-Rate Control
♦ Drives Large Synchronous Rectifier MOSFETs
♦ Undervoltage and Thermal-Fault Protection
♦ Power Sequencing and Timing
♦ Selectable Suspend Voltage
♦ Soft-Start and Soft-Shutdown
♦ Selectable Single- or Dual-Phase Pulse Skipping
Ordering Information
PART
TEMP RANGE
MAX8760ETL -40°C to +100°C
MAX8760ETL+ -40°C to +100°C
+Denotes lead-free package.
PIN-PACKAGE
40 Thin QFN 6mm x 6mm
40 Thin QFN 6mm x 6mm
Pin Configuration
TOP VIEW
30 29 28 27 26 25 24 23 22 21
PGND 31
DLS 32
DHS 33
LXS 34
BSTS 35
V+ 36
CMP 37
CMN 38
CSN 39
CSP 40
MAX8760
1 2 3 4 5 6 7 8 9 10
20 D4
19 D5
18 SKIP
17 OAIN+
16 OAIN-
15 FB
14 CCI
13 GNDS
12 CCV
11 GND
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Turion 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.