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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1715 Datasheet

Ultra-High Efficiency / Dual Step-Down Controller for Notebook Computers

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19-1541; Rev 0; 1/00
EVAALVUAAILTAIOBNLEKIT
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
General Description
The MAX1715 PWM controller provides the high effi-
ciency, excellent transient response, and high DC out-
put accuracy needed for stepping down high-voltage
batteries to generate low-voltage CPU core, I/O, and
chipset 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 MAX1715 achieves high efficiency at a reduced
cost by eliminating the current-sense resistor found in
traditional current-mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous-
rectifier MOSFETs.
Single-stage buck conversion allows this device 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 MAX1715 is intended for CPU core, chipset,
DRAM, or other low-voltage supplies as low as 1V. The
MAX1715 is available in a 28-pin QSOP package. For
applications requiring VID compliance or DAC control
of output voltage, refer to the MAX1710/MAX1711 data
sheet. For a single-output version, refer to the MAX1714
data sheet.
Applications
Notebook Computers
CPU Core Supply
Chipset/RAM Supply as Low as 1V
1.8V and 2.5V I/O Supply
Pin Configuration appears 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 Dual-Mode Fixed 1.8V/3.3V/Adj or 2.5V/Adj Outputs
o Adjustable 1V to 5.5V Output Range
o 2V to 28V Battery Input Range
o 200/300/420/540kHz Nominal Switching Frequency
o Over/Undervoltage Protection
o 1.7ms Digital Soft-Start
o Drives Large Synchronous-Rectifier FETs
o Power-Good Indicator
PART
MAX1715EEI
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
5V INPUT
OUTPUT1
1.8V
Minimal Operating Circuit
VDD
VCC
ILIM1
ILIM2
ON1
ON2
BST1
V+
BST2
DH1 DH2
LX1 LX2
DL1 DL2
TON PGND
OUT1 OUT2
PGOOD
REF SKIP
FB1 AGND FB2
BATTERY
4.5V TO 28V
MAX1715
OUTPUT2
2.5V
Quick-PWM is a trademark of Maxim Integrated Products.
________________________________________________________________ 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

MAX1715 Datasheet

Ultra-High Efficiency / Dual Step-Down Controller for Notebook Computers

No Preview Available !

Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
V+ to AGND..............................................................-0.3 to +30V
VDD , VCC to AGND ..................................................-0.3V to +6V
PGND to AGND or VCC to VDD ...........................................±0.3V
PGOOD, OUT_ to AGND..........................................-0.3V to +6V
ILIM_, FB_, REF, SKIP, TON,
ON_ to AGND ...........................................-0.3V to (VDD + 0.3V)
DL_ to PGND ..............................................-0.3V to (VDD + 0.3V)
BST_ to AGND........................................................-0.3V to +36V
DH1 to LX1 ...............................................-0.3V to (BST1 + 0.3V)
DH2 to LX2 ...............................................-0.3V to (BST2 + 0.3V)
LX1 to BST1..............................................................-6V to +0.3V
LX2 to BST2..............................................................-6V to +0.3V
REF Short Circuit to AGND.........................................Continuous
Continuous Power Dissipation (TA = +70°C)
28-Pin QSOP (derate 8.0mW/°C above +70°C).....640mW/°C
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
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, VCC = VDD = +5V, SKIP = AGND, V+ = 15V, TA = 0°C to +85°C, unless otherwise
noted.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
Output 1 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
Output 1 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
Battery voltage, V+
VDD, VCC
V+ = 2V to 28V,
SKIP = VCC, TA = +25°C
ILOAD = 0 to 4A
V+ = 2V to 28V,
SKIP = VCC, TA = 0°C to +85°C
ILOAD = 0 to 4A
FB1 = OUT1
FB1 = AGND
FB1 = VCC
FB1 = OUT1
FB1 = AGND
FB1 = VCC
2 28
4.5 5.5
0.99 1.00 1.01
1.782 1.8 1.818
3.267 3.3 3.333
0.985 1.00 1.105
1.773 1.8 1.827
3.250 3.3 3.350
V
V
V
Output 2 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
V+ = 2V to 28V,
SKIP = VCC, TA = +25°C
ILOAD = 0 to 4A
FB2 = OUT2
FB2 = GND
0.99 1.00 1.01
2.475 2.5 2.525
V
Output 2 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
Load Regulation Error
Line Regulation Error
Output Voltage Range
OUT_ Input Resistance
FB_ Input Bias Current
Soft-Start Ramp Time
On-Time (PWM1)
On-Time (PWM2)
V+ = 2V to 28V,
SKIP = VCC, TA = 0°C to +85°C
ILOAD = 0 to 4A
FB2 = OUT2
FB2 = GND
ILOAD = 0 to 4A, each output
VCC = 4.5V to 5.5V, V+ = 4.5V to 28V
Adjustable mode, each output
FB_ = AGND
VOUT_ = AGND
Rising edge of ON_ to full current limit
TON = GND
V+ = 24V, OUT1 = 2V
TON = REF
TON = open
TON = VDD
TON = GND
V+ = 24V, OUT2 = 2V
TON = REF
TON = open
TON = VDD
0.985
2.463
1
75k
-0.1
112
142
210
300
154
198
292
420
1.00
2.5
0.4
0.2
1.7
136
173
247
353
182
234
336
484
1.105
2.538
5.5
0.1
160
205
280
407
215
270
380
550
V
%
%
V
µA
ms
ns
ns
2 _______________________________________________________________________________________


Part Number MAX1715
Description Ultra-High Efficiency / Dual Step-Down Controller for Notebook Computers
Maker Maxim
Total Page 28 Pages
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