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MAX1715EEI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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
Features
♦ Ultra-High Efficiency
♦ No Current-Sense Resistor (lossless I
LIMIT
)
♦ Quick-PWM with 100ns Load-Step Response
♦ 1% V
OUT
Accuracy over Line and Load
♦ Dual-Mode Fixed 1.8V/3.3V/Adj or 2.5V/Adj Outputs
♦ Adjustable 1V to 5.5V Output Range
♦ 2V to 28V Battery Input Range
♦ 200/300/420/540kHz Nominal Switching Frequency
♦ Over/Undervoltage Protection
♦ 1.7ms Digital Soft-Start
♦ Drives Large Synchronous-Rectifier FETs
♦ Power-Good Indicator
MAX1715
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
________________________________________________________________ Maxim Integrated Products 1
19-1541; Rev 2; 8/05
Pin Configuration appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products.
Ordering Information
EVALUATION KIT
AVAILABLE
V
CC
OUTPUT1
1.8V
BATTERY
4.5V TO 28V
ILIM1
ON2
DL1
TON
OUT1
LX1
DH1
FB1 AGND
V
DD
BST1
ILIM2
ON1
REF
DL2
PGND
OUT2
LX2
DH2
FB2
V+
BST2
SKIP
5V INPUT
PGOOD
OUTPUT2
2.5V
MAX1715
Minimal Operating Circuit
PART TEMP RANGE PIN-PACKAGE
MAX1715EEI -40°C to +85°C 28 QSOP
MAX1715EEI+
-40°C to +85°C 28 QSOP
+ Denotes lead-free package.
MAX1715
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
V+ to AGND..............................................................-0.3 to +30V
V
DD
, V
CC
to AGND..................................................-0.3V to +6V
PGND to AGND or V
CC
to V
DD
...........................................±0.3V
PGOOD, OUT_ to AGND..........................................-0.3V to +6V
ILIM_, FB_, REF,
SKIP, TON,
ON_ to AGND...........................................-0.3V to (V
DD
+ 0.3V)
DL_ to PGND..............................................-0.3V to (V
DD
+ 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 (T
A
= +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
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, 4A components from Table 1, V
CC =
V
DD
= +5V, SKIP = AGND, V+ = 15V, T
A
= 0°C to +85°C, unless otherwise
noted.) (Note 1)
I
LOAD
= 0 to 4A, each output %0.4
FB2 = GND
Battery voltage, V+
Input Voltage Range
V+ = 24V, OUT2 = 2V
Load Regulation Error
V
CC
= 4.5V to 5.5V, V+ = 4.5V to 28V
V+ = 24V, OUT1 = 2V
Adjustable mode, each output
Output 2 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
TON = GND
FB_ Input Bias Current
TON = GND
TON = open
V
OUT
_ = AGND
210 247 280
CONDITIONS
V
TON = REF
142 173 205
ms
TON = V
DD
OUT_ Input Resistance
µA
Soft-Start Ramp Time
ΩFB_ = AGND
Rising edge of ON_ to full current limit
2.475 2.5 2.525
V+ = 2V to 28V,
SKIP = V
CC
, T
A
= +25°C
I
LOAD
= 0 to 4A
V+ = 2V to 28V,
SKIP = V
CC
, T
A
= +25°C
I
LOAD
= 0 to 4A
ns
154 182 215
V
On-Time (PWM2)
ns
112 136 160
0.99 1.00 1.01
On-Time (PWM1)
V
1.7
0.99 1.00 1.01
300 353 407
1.782 1.8 1.818
-0.1 0.1
TON = open
292 336 380
TON = REF
75k
3.267 3.3 3.333
FB1 = V
CC
FB1 = AGND
FB1 = OUT1
228
FB2 = OUT2
V
1 5.5
Output Voltage Range
%0.2
198 234 270
Line Regulation Error
TON = V
DD
420 484 550
UNITSMIN TYP MAXPARAMETER
Output 1 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
4.5 5.5
V
DD,
V
CC
Output 1 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
V+ = 2V to 28V,
SKIP = V
CC
, T
A
= 0°C to +85°C
I
LOAD
= 0 to 4A
V
0.985 1.00 1.105
1.773 1.8 1.827
3.250 3.3 3.350
FB1 = V
CC
FB1 = AGND
FB1 = OUT1
FB2 = GND
Output 2 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
2.463 2.5 2.538
V+ = 2V to 28V,
SKIP = V
CC
, T
A
= 0°C to +85°C
I
LOAD
= 0 to 4A
V
0.985 1.00 1.105
FB2 = OUT2
MAX1715
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, 4A components from Table 1, V
CC =
V
DD
= +5V, SKIP = AGND, V+ = 15V, T
A
= 0°C to +85°C, unless otherwise
noted.) (Note 1)
(Note 3) ns400 500Minimum Off-Time
I
REF
= 0 to 50µA
No external REF load
ON1 = ON2 = 0
V2 0.01Reference Load Regulation
V1.98 2 2.02Reference Voltage
µA<1 5Shutdown Supply Current (V+)
µA<1 5
Shutdown Supply Current
(V
CC
+ V
DD
)
Falling edge, hysteresis = 40mV V1.6REF Fault Lockout Voltage
10
PGND - LX_, I
LIM
resistor = 100kΩ
mV
40 50 60
Current-Limit Threshold
(Positive Direction, Adjusted)
PGND - LX_, T
A
= +25°C, I
LIM
= V
CC
mV-145 -120 -95
Current-Limit Threshold
(Negative Direction)
PGND - LX_, SKIP = AGND
mV-5 3 10
Current-Limit Threshold, Zero
Crossing
Hysteresis = 10°C °C150Thermal Shutdown Threshold
Rising edge, hysteresis = 20mV, PWM disabled below
this level
V4.1 4.4
V
CC
Undervoltage Lockout
Threshold
BST - LX forced to 5V Ω1.5 5DH Gate Driver On-Resistance
FB1 and FB2 forced above the regulation point µA1100 1600
Quiescent Supply Current
(V
CC
+ V
DD
)
µA25 70Quiescent Battery Current (V+)
FB_ forced 2% above trip threshold µs1.5
Overvoltage Fault Propagation
Delay
With respect to error comparator threshold %8.5 10.5 13Overvoltage Trip Threshold
With respect to error comparator threshold %60 70 80Output Undervoltage Threshold
From ON_ signal going high ms10 20 30
Output Undervoltage Lockout
Time
PGND - LX_, I
LIM
= V
CC
mV75 100 125
Current-Limit Threshold
(Positive Direction, Fixed)
ON1 = ON2 = 0
DL, high state Ω1.5 5
DL Gate Driver On-Resistance
(pull-up)
0.6 2.5
A
DH Gate Driver Source/Sink
Current
DH forced to 2.5V, BST_ - LX_ forced to 5V 1
ADL Gate Driver Source Current DL forced to 2.5V 1
ADL Gate Driver Sink Current DL forced to 2.5V 3
nsDead Time
DL rising 35
REF in regulationREF Sink Current
DL, low state
DL Gate Driver On-Resistance
(pull-down)
Ω
µA
CONDITIONS UNITSMIN TYP MAXPARAMETER
PGND - LX_, I
LIM
resistor = 400kΩ 160 200 240
DH rising 26
ON_, SKIP
0.8
VLogic Input High Voltage
ON_, SKIP
2.4
VLogic Input Low Voltage
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

MAX1715EEI+T

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Buy MAX1715EEI+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Dual Step-Down Controller
Lifecycle:
New from this manufacturer.
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