Rainbow Electronics MAX8760 - Manual

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
D4
D5
OAIN+
OAIN-
GNDS
CCV
GND
FB
CCI
DHS
LXS
BSTS
CMP
CMN
CSN
1 2 3 4 5 6 7 8 9 10
30 29 28 27 26 25 24 23 22 21
CSP
DLS
PGND 31
32
33
34
35
36
37
38
39
40
20
19
18
17
16
15
14
13
12
11
S1
OFS REF ILIM V
CC S0
SUS TON TIME
DLM DHM LXM BSTM VROK D0 D1 D2 D3 V
DD
THIN QFN
MAX8760
TOP VIEW
V+
SKIP
SHDN
Pin Configuration
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX8760ETL -40°C to +100°C 40 Thin QFN 6mm x 6mm
MAX8760ETL+ -40°C to +100°C 40 Thin QFN 6mm x 6mm
MAX8760
Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
________________________________________________________________ Maxim Integrated Products 1
19-3721; Rev 0; 5/05
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.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Turion is a trademark of AMD.
+Denotes lead-free package.