MAX1519 Datasheet, PDF (1/43 Pages) Maxim Integrated Products – Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

19-2734; Rev 1; 9/03
EVAALVUAAILTAIOBNLEKIT
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
General Description
The MAX1519/MAX1545 are dual-phase, Quick-PWM™,
step-down controllers for desktop and mobile Pentium^®4
(P4) CPU core supplies. Dual-phase operation reduces
input ripple current requirements and output voltage rip-
ple while easing component selection and layout difficul-
ties. The Quick-PWM control scheme provides
instantaneous response to fast load-current steps. The
MAX1519/MAX1545 include active voltage positioning
with adjustable gain and offset, reducing power dissipa-
tion and bulk output capacitance requirements.
The MAX1519/MAX1545 are intended for two different
notebook CPU core applications: stepping down the bat-
tery 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 efficiency.
Alternatively, two-stage conversion (stepping down the
5V system supply instead of the battery) at a higher
switching frequency provides the minimum possible
physical size.
The MAX1519/MAX1545 comply with Intel’s P4 specifi-
cations. The switching regulator features soft-start,
power-up sequencing, and soft-shutdown. The
MAX1519/MAX1545 also feature independent four-level
logic inputs for setting the suspend voltage (S0–S1).
The MAX1519/MAX1545 include output undervoltage
protection (UVP), thermal protection, and voltage regula-
tor power-OK (VROK) output. When any of these protec-
tion features detect a fault, the controller shuts down.
Additionally, the MAX1519/MAX1545 include overvoltage
protection.
The MAX1519/MAX1545 are available in low-profile, 40-
pin, 6mm x 6mm thin QFN packages. For other CPU
platforms, refer to the pin-to-pin compatible MAX1544
and MAX1532/MAX1546/MAX1547 data sheets.
Applications
Desktop and Mobile P4 Computers
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
Low-Voltage, Digitally Programmable Power
Supplies
Features
o Dual-Phase, Quick-PWM Controllers
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
Mobile: 0.60V to 1.75V Output Range
Desktop: 1.10V to 1.85V Output Range
o Selectable 100kHz/200kHz/300kHz/550kHz
Switching Frequency
o 4V to 28V Battery Input Voltage Range
o Adjustable Slew-Rate Control
o Drive Large Synchronous Rectifier MOSFETs
o Output Overvoltage Protection (MAX1545 Only)
o Undervoltage and Thermal-Fault Protection
o Power Sequencing and Timing
o Selectable Suspend Voltage (0.675V to 1.45V)
o Soft-Shutdown
o Selectable Single- or Dual-Phase Pulse Skipping
Ordering Information
PART
TEMP RANGE
MAX1519ETL -40°C to +100°C
MAX1545ETL -40°C to +100°C
PIN-PACKAGE
40 Thin QFN 6mm ✕ 6mm
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
MAX1519
MAX1545
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.
Pentium is a registered trademark of Intel Corp.
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.