Rainbow Electronics MAX1545 - Manual

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
♦ Dual-Phase, Quick-PWM Controllers
♦ ±0.75% V
OUT
Accuracy Over Line, Load, and
Temperature (1.3V)
♦ Active Voltage Positioning with Adjustable Gain
and Offset
♦ 5-Bit On-Board DAC
Mobile: 0.60V to 1.75V Output Range
Desktop: 1.10V to 1.85V Output Range
♦ Selectable 100kHz/200kHz/300kHz/550kHz
Switching Frequency
♦ 4V to 28V Battery Input Voltage Range
♦ Adjustable Slew-Rate Control
♦ Drive Large Synchronous Rectifier MOSFETs
♦ Output Overvoltage Protection (MAX1545 Only)
♦ Undervoltage and Thermal-Fault Protection
♦ Power Sequencing and Timing
♦ Selectable Suspend Voltage (0.675V to 1.45V)
♦ Soft-Shutdown
♦ Selectable Single- or Dual-Phase Pulse Skipping
MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
________________________________________________________________ Maxim Integrated Products 1
V DD
DLM
LXM
BSTM
D1
D2
D3
VROK
D0
DHM SUS
S0
S1
OFS
REF
ILIM
V CC
TON
TIME 1
2
3
4
5
6
7
8
9
10
11 12 13 14 15 16 17 18 19 20
40 39 38 37 36 35 34 33 32 31
30
29
28
27
26
25
24
23
22
21
FB
OAIN- OAIN+ CODE
D4
CCI
GNDS
CCV GND
CSN CMN CMP V+ BSTS LXS DHS DLS PGND CSP
THIN QFN
MAX1519
MAX1545
TOP VIEW
SHDN
SKIP
Pin Configuration
Ordering Information
19-2734; Rev 1; 9/03
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX1519ETL -40°C to +100°C 40 Thin QFN 6mm ✕ 6mm
MAX1545ETL -40°C to +100°C 40 Thin QFN 6mm ✕ 6mm
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Pentium is a registered trademark of Intel Corp.