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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1714 Datasheet

High-Speed Step-Down Controller for Notebook Computers

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19-1536; Rev 1; 12/99
EVAFLOULALTOIWONDKAITTAMSAHNEUEATLS
High-Speed Step-Down Controller
for Notebook Computers
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 MAX1715data sheet.
Applications
Notebook Computers
CPU Core Supply
Chipset/RAM Supply as Low as 1V
1.8V and 2.5V I/O Supply
Quick-PWM is a trademark of Maxim Integrated Products.
Future product—contact factory for availability.
Pin Configurations appear at end of data sheet.
Features
o Ultra-High Efficiency
o No Current-Sense Resistor (Lossless ILIMIT)
o Quick-PWM with 100ns Load-Step Response
o 1% VOUT Accuracy Over Line and Load
o 2.5V/3.3V Fixed or 1V to 5.5V Adjustable Output
Range
o 2V to 28V Battery Input Range
o 200/300/450/600kHz Switching Frequency
o Overvoltage Protection (MAX1714A)
o Undervoltage Protection
o 1.7ms Digital Soft-Start
o Drives Large Synchronous-Rectifier FETs
o 2V ±1% Reference Output
o Power-Good Indicator
PART
MAX1714AEEP
MAX1714BEEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 QSOP
16 QSOP
Minimal Operating Circuit
+5V INPUT
VCC
SHDN
VDD
V+
BATTERY
4.5V TO 28V
ILIM BST
DH
MAX1714
LX
REF
DL
PGOOD PGND
(GND)
FB OUT
SKIP
AGND
(GND)
OUTPUT
1.25V TO 2V
( ) ARE FOR THE MAX1714B ONLY.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1714 Datasheet

High-Speed Step-Down Controller for Notebook Computers

No Preview Available !

High-Speed Step-Down Controller
for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
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.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, 4A components from Table 1, V+ = +15V, VCC = VDD = +5V, SKIP = AGND, TA = 0°C to +85°C, unless otherwise
noted.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
Battery voltage, V+
VCC, VDD
2 28
V
4.5 5.5
Error Comparator Threshold
(DC Output Voltage Accuracy)
(Note 3)
Load Regulation Error
V+ = 4.5V to 28V,
SKIP = VCC
ILOAD = 0 to 3A, SKIP = VCC
FB = OUT
FB = AGND
FB = VCC
0.99 1.0 1.01
2.475 2.5 2.525
V
3.267 3.3 3.333
9 mV
Line Regulation Error
VCC = 4.5V to 5.5V, V+ = 4.5V to 28V
5 mV
FB Input Bias Current
-0.1 0.1 µA
OUT Input Resistance
FB = AGND
100 190 300 k
Soft-Start Ramp Time
On-Time
Rising edge of SHDN to full ILIM
TON = AGND (600kHz)
V+ = 24V,
VOUT = 2V
(Note 4)
TON = REF (450kHz)
TON = unconnected (300kHz)
TON = VCC (200kHz)
1.7 ms
140 160 180
175 200 225
260 290 320
ns
380 425 470
Minimum Off-Time
(Note 4)
400 500
ns
Quiescent Supply Current (VCC) FB forced above the regulation point
550 750 µA
Quiescent Supply Current (VDD) FB forced above the regulation point
<1 5 µA
Quiescent Supply Current (V+)
25 40 µA
Shutdown Supply Current (VCC) V SHDN = 0
<1 5 µA
Shutdown Supply Current (VDD) V SHDN = 0
<1 5 µA
Shutdown Supply Current (V+) V SHDN = 0 , V+ = 28V, VCC = VDD = 0 or 5V
<1 5 µA
Reference Voltage
VCC = 4.5V to 5.5V, no external REF load
1.98 2 2.02 V
Reference Load Regulation
IREF = 0 to 50µA
0.01 V
REF Sink Current
REF in regulation
10 µA
REF Fault Lockout Voltage
Falling edge, hysteresis = 40mV
1.6 V
2 _______________________________________________________________________________________


Part Number MAX1714
Description High-Speed Step-Down Controller for Notebook Computers
Maker Maxim
Total Page 24 Pages
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