MAX1714BEEE
High-Speed Step-Down Controller for Notebook Computers

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The MAX1714 pulse-width modulation (PWM) controller provides the high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate lowvoltage CPU core or chip-set/RAM supplies in notebook computers.

Maxim’s proprietary Quick-PWM™ quick-response,constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.

The MAX1714 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronousrectifier MOSFETs.

Single-stage buck conversion 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 allows the minimum possible physical size.

The MAX1714 is intended for CPU core, chipset,DRAM, or other low-voltage supplies as low as 1V. The MAX1714A is available in a 20-pin QSOP package and includes overvoltage protection. The MAX1714B is available in a 16-pin QSOP package with no overvoltage protection. For applications requiring VID compliance or DAC control of output voltage, refer to the MAX1710/MAX1711 data sheet. For a dual output version, refer to the MAX1715† data sheet.

● Notebook Computers
CPU Core Supply
Chipset/RAM Supply as Low as 1V
1.8V and 2.5V I/O Supply

V+ to AGND (Note 1).............................................-0.3V to +30V
VDD, VCC to AGND (Note 1)....................................-0.3V to +6V
PGND to AGND (Note 1) ....................................................±0.3V
SHDN, PGOOD, OUT to AGND (Note 1)....................-0.3V to +6V
ILIM, FB, REF,SKIP,
TON to AGND (Notes 1, 2).........................-0.3V to (VCC + 0.3V)
DL to PGND (Note 1).................................-0.3V to (VDD + 0.3V)
BST to AGND (Note 1) ..........................................-0.3V to +36V
DH to LX....................................................-0.3V to (BST + 0.3V)
LX to BST................................................................-6V to +0.3V
REF Short Circuit to AGND........................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C).............667mW
20-Pin QSOP (derate 9.1mW/°C above +70°C).............727mW
Operating Temperature Range ........................-40°C to +85°C
Junction Temperature....................................................+150°C
Storage Temperature Range ..........................-65°C to +150°C
Lead Temperature (soldering, 10s) ..............................+300°C

Note 1: For the MAX1714B, AGND and PGND refer to a single pin designated GND.
Note 2: SKIP may be forced below -0.3V, temporarily exceeding the absolute maximum rating, disabling over/undervoltage fault detection for the purpose of debugging prototypes (Figure 6). Limit the current drawn to 5mA maximum.


Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

◆ Ultra-High Efficiency
◆ No Current-Sense Resistor (Lossless ILIMIT)
◆ Quick-PWM with 100ns Load-Step Response
◆ 1% VOUT Accuracy Over Line and Load
◆ 2.5V/3.3V Fixed or 1V to 5.5V Adjustable Output Range
◆ 2V to 28V Battery Input Range
◆ 200/300/450/600kHz Switching Frequency
◆ Overvoltage Protection (MAX1714A)
◆ Undervoltage Protection
◆ 1.7ms Digital Soft-Start
◆ Drives Large Synchronous-Rectifier FETs
◆ 2V ±1% Reference Output
◆ Power-Good Indicator

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Datasheet

Size: 443.08KB
Page: 24
PDF: MAX1714BEEE.pdf
  • Description:
    High-Speed Step-Down Controller for Notebook Computers
  • MFG:
    MAXIM [Maxim Integrated Products]
 

Abstract


For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
General Description
The MAX1714 pulse-width modulation (PWM) controller
provides the high efficiency, excellent transient
response, and high DC output accuracy needed for
stepping down high-voltage batteries to generate low-
voltage CPU core or chip-set/RAM supplies in notebook
computers.
Maxim’s proprietary Quick-PWM? quick-response,
constant-on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides
100ns “instant-on” response to load transients while
maintaining a relatively constant switching frequency.
The MAX1714 achieves high efficiency at a reduced
cost by eliminating the current-sense resistor found in
traditional current-mode PWMs. Efficiency is further
enhanced by an ability to drive very large synchronous-
rectifier MOSFETs.
Single-stage buck conversion 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 allows the mini-
mum possible physical size.
The MAX1714 is intended for CPU core, chipset,
DRAM, or other low-voltage supplies as low as 1V. The
MAX1714A is available in a 20-pin QSOP package and
includes overvoltage protection. The MAX1714B is
available in a 16-pin QSOP package with no overvolt-
age protection. For applications requiring VID compli-
ance or DAC control of output voltage, refer to the
MAX1710/MAX1711 data sheet. For a dual output ver-
sion, refer to the MAX1715
?
data sheet.
Applications
Notebook Computers
CPU Core Supply
Chipset/RAM Supply as Low as 1V
1.8V and 2.5V I/O Supply
Features
a111 Ultra-High Efficiency
a111 No Current-Sense Resistor (Lossless I
LIMIT
)
a111 Quick-PWM with 100ns Load-Step Response
a111 1% V
OUT
Accuracy Over Line and Load
a111 2.5V/3.3V Fixed or 1V to 5.5V Adjustable Output
Range
a111 2V to 28V Battery Input Range
a111 200/300/450/600kHz Switching Frequency
a111 Overvoltage Protection (MAX1714A)
a111 Undervoltage Protection
a111 1.7ms Digital Soft-Start
a111 Drives Large Synchronous-Rectifier FETs
a111 2V ±1% Reference Output
a111 Power-Good Indicator
MAX1714
High-Speed Step-Down Controller
for Notebook Computers
________________________________________________________________ Maxim Integrated Products 1
19-1536; Rev 1; 12/99
Pin Configurations appear at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products.
?
Future product—contact factory for availability.
-40°C to +85°C
PART
MAX1714AEEP
TEMP. RANGE PIN-PACKAGE
20 QSOP
Ordering Information
EVALUATION KIT MANUALS
FOLLOW DATA SHEET
V
CC
+5V INPUT
BATTERY
4.5V TO 28V
OUTPUT
1.25V TO 2V
SHDN
ILIM
DL
LX
V+
BST
DH
PGND
(GND)
OUT
SKIP
V
DD
MAX1714
REF
PGOOD
FB
AGND
(GND)
( ) ARE FOR THE MAX1714B ONLY.
Minimal Operating Circuit
MAX1714BEEE -40°C to +85°C 16 QSOP

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