MAX1981A Maxim Integrated Products, MAX1981A Datasheet
MAX1981A
Manufacturer Part Number
MAX1981A
Description
(MAX1907A / MAX1981A) Quick-PWM Master Controllers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1981A.pdf
(43 pages)
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The MAX1907A/MAX1981A are single-phase, Quick-
PWM™ master controllers for IMVP-IV™ CPU core sup-
plies. Multi-phase operation is achieved using a
Quick-PWM slave controller (MAX1980). Multiphase
operation reduces input ripple current requirements
and output voltage ripple while easing component
selection and layout difficulties. The MAX1907A/
MAX1981A include active voltage positioning with
adjustable gain and offset, reducing power dissipation
and bulk output capacitance requirements.
The MAX1907A/MAX1981A are intended for two differ-
ent notebook CPU core applications: either bucking
down the battery directly, or 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 higher
switching frequency provides the minimum possible
physical size.
The MAX1907A/MAX1981A meet the IMVP-IV specifica-
tions and include logic to interface with the CPU power
good signals from the V
system. The regulator features power-up sequencing,
automatically ramping up to the Intel-specified boot volt-
age. The MAX1907A/MAX1981A feature independent
four-level logic inputs for setting the boot voltage
(B0–B2) and the suspend voltage (S0–S2).
The MAX1907A/MAX1981A include output undervoltage
protection, thermal protection, and system power-OK
(SYSPOK) input/output. When any of these protection fea-
tures detect a fault, the MAX1907A/MAX1981A immedi-
ately shut down. Additionally, the MAX1907A includes
overvoltage protection.
The MAX1907A/MAX1981A are available in a thin 40-pin
QFN package.
19-2678; Rev 0; 9/02
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
IMVP-IV is a trademark of Intel Corp.
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.
Positioned CPU Core Power Supplies (IMVP-IV)
IMVP-IV™ Notebook Computers
Single-Phase CPU Core Supply
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
Quick-PWM Master Controllers for Voltage-
________________________________________________________________ Maxim Integrated Products
CCP
General Description
and V
CCMCH
Applications
rails within the
♦ Quick-PWM Master Controllers
♦ Multiphase Conversion with Slave Controller
♦ Active Voltage Positioning with Adjustable Gain
♦ Adjustable Slew Rate Control
♦ ±0.75% V
♦ 6-Bit On-Board DAC (16mV Increments)
♦ 0.700V to 1.708V Output Adjust Range
♦ Selectable 200kHz/300kHz/550kHz/1000kHz
♦ 2V to 28V Battery Input Voltage Range
♦ Drive Large Synchronous Rectifier MOSFETs
♦ Output Overvoltage Protection (MAX1907A Only)
♦ Undervoltage and Thermal Fault Protection
♦ Power Sequencing and Selectable Boot Voltage
♦ Low-Profile 40-Pin Thin QFN, 6mm
MAX1907AETL -40°C to +100°C
MAX1981AETL -40°C to +100°C
(MAX1980)
and Offset
Temperature
Switching Frequency
Package
PART
TOP VIEW
SHDN
ILIM
V
REF
B0
B1
B2
S0
S1
S2
CC
OUT
1
2
3
4
5
6
7
8
9
10
40
11
TEMP RANGE
Accuracy Over Line, Load, and
39
12
40-Pin, 6mm x 6mm Thin QFN
38
13
Ordering Information
14
37
36
15
MAX1907A
MAX1981A
Pin Configuration
16
35
34
17
PIN-PACKAGE
40- QFN Thi n 6m m x 6m m
40- QFN Thi n 6m m x 6m m
18
33
19
32
20
✕ ✕
31
Features
6mm
30
29
28
27
26
25
24
23
22
21
V
DL
PGND
DDO
D0
D1
D2
D3
D4
D5
DD
1
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