MAX1515ETG ,+1.3 V to +3.6 V, Low-voltage, internal switch, step-down/DDR regulatorfeatures dual internal♦ 1MHz Maximum Switching Frequencyn-channel MOSFET power switches for high ef ..
MAX1515ETG+ ,Low-Voltage, Internal Switch, Step-Down/DDR Regulatorfeatures dual internal♦ 1MHz Maximum Switching Frequencyn-channel MOSFET power switches for high ef ..
MAX1515ETG+T ,Low-Voltage, Internal Switch, Step-Down/DDR RegulatorApplications VCCMAX1515 V = VOUT TTNotebook DDR Memory Termination COMPLXPGOODFBActive-Termination ..
MAX1517ETJ ,TFT-LCD DC-DC Converters with Operational AmplifiersFeaturesThe MAX1516/MAX1517/MAX1518 include a high-perfor-♦ 2.6V to 5.5V Input Supply Rangemance st ..
MAX1517ETJ+ ,TFT-LCD DC-DC Converters with Operational AmplifiersFeaturesThe MAX1516/MAX1517/MAX1518 include a high-perfor-♦ 2.6V to 5.5V Input Supply Rangemance st ..
MAX1517ETJ+T ,TFT-LCD DC-DC Converters with Operational AmplifiersELECTRICAL CHARACTERISTICS(V = 3V, V = 8V, PGND = AGND = BGND = 0, I = 25µA, T = 0°C to +85°C. Typi ..
MAX4163EUA ,SOT23 / Micropower / Single-Supply / Rail-to-Rail I/O Op AmpsELECTRICAL CHARACTERISTICS: +3V Operation(V =+3V, V = 0V, V = V / 2, V = V / 2, R tied to V / 2, T ..
MAX4163EUA ,SOT23 / Micropower / Single-Supply / Rail-to-Rail I/O Op AmpsGeneral Description ________
MAX4163EUA ,SOT23 / Micropower / Single-Supply / Rail-to-Rail I/O Op AmpsApplicationsMAX4162EUK -40°C to +85°C 5 SOT23-5 AABXBattery-Powered Devices Medical InstrumentsMAX4 ..
MAX4163EUA ,SOT23 / Micropower / Single-Supply / Rail-to-Rail I/O Op AmpsMAX4162/MAX4163/MAX416419-1195; Rev 0; 4/97SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op Am ..
MAX4163EUA+ ,SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op AmpsApplicationsMAX4163EUA+ -40°C to +85°C 8 µMAX — Battery-Powered Devices Medical Instruments MAX4164 ..
MAX4163EUA+T ,SOT23, Micropower, Single-Supply, Rail-to-Rail I/O Op AmpsApplicationsMAX4163EUA+ -40°C to +85°C 8 µMAX — Battery-Powered Devices Medical Instruments MAX4164 ..
MAX1515ETG
+1.3 V to +3.6 V, Low-voltage, internal switch, step-down/DDR regulator
General DescriptionThe MAX1515 constant-off-time, pulse-width-modulated
(PWM) source/sink step-down DC-DC converter is opti-
mized for use in low-voltage active-termination power
rails or chipset power supplies in notebook and sub-
notebook computers. This device features dual internal
n-channel MOSFET power switches for high efficiency
and reduced component count. External Schottky
diodes are not required. An integrated boost switch
eliminates the need for an external boost diode. The
internal 40mΩNMOS power switches easily source and
sink continuous load currents up to 3A. The MAX1515
produces an adjustable output from +0.5V to +2.7V
and achieves efficiencies as high as 95%.
The MAX1515 can be configured as a DDR regulator,
producing an output that is exactly half the memory
supply rail. The input of the power stage can be taken
from the memory supply rail itself, resulting in an effi-
cient power supply that returns the energy to the rail
from which it was sourced. The MAX1515 includes a
reference buffer that provides ±5mA of drive current.
The MAX1515 uses a unique current-mode, constant-
off-time, PWM control scheme. A selectable pulse-skip-
ping mode maintains high efficiency during light-load
operation, yet still sources and sinks current on
demand. The MAX1515 can also be operated in fixed-
PWM mode for low output ripple. The programmable
constant-off-time architecture sets switching frequen-
cies up to 1MHz, which allows the user to optimize per-
formance trade-offs between efficiency, output
switching noise, component size, and cost. The
MAX1515 features an adjustable soft-start to limit surge
currents during startup and a low-power shutdown
mode to disconnect the input from the output and
reduce supply current below 1µA. The MAX1515 is
available in a 24-pin thin QFN package with an
exposed backside pad.
ApplicationsNotebook DDR Memory Termination
Active-Termination Buses
Chipset/Graphics Processor Supplies
FeaturesDual 40mΩ Internal n-Channel MOSFETsIntegrated Boost Switch+1.3V to +3.6V Input Voltage Range1% VOUTAccuracy Over Line and Load1MHz Maximum Switching FrequencyDDR Termination Regulator (DDR Mode)
Tracking Output Voltage
Source/Sink Pulse Skipping
±5mA Reference BufferOutput Voltage (Non-DDR Mode)
+2.5V, +1.8V, or +1.5V Pin Selectable
+0.5V to +2.7V Adjustable1.1V ±0.75% Reference OutputAdjustable Soft-Start Inrush Current Limiting< 1µA (typ) Shutdown Supply Current< 800µA (max) Operating Supply CurrentSelectable Pulse-Skipping Operation at Light LoadsPositive and Negative Current LimitPower-Good Window ComparatorOutput Short-Circuit Protection
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Ordering Information
Minimal Operating Circuit19-3507; Rev 0; 11/04
Pin Configuration appears at end of data sheet.+Denotes lead-free package.
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VIN= +3.3V, VCC= VDD= SHDN= MODE = +3.3V, VREFIN= VREF, SKIP= GND, TA
= 0°C to +85°C, unless oth-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.
VCC, VDD, LX, SHDNto GND...................................-0.3V to +4V
MODE, IC, PGOOD to GND.....................................-0.3V to +4V
COMP, FB, REF, REFIN, REFOUT to GND....-0.3V to (VCC+ 0.3V)
FBSEL0, FBSEL1, TOFF, SKIP, SS to GND....-0.3V to (VCC+ 0.3V)
VDDto VCC...........................................................-0.3V to + 0.3V
IN to VDD....................................................-0.3V to (VDD+ 0.3V)
PGND to GND......................................................-0.3V to +0.3V
LX to BST.................................................................-4V to +0.3V
BST to GND..........................................................-0.3V to +8.0V
LX Current (Note 1).............................................................±4.7A
REF Short Circuit to GND...........................................Continuous
REFOUT Short Circuit to GND....................................Continuous
Continuous Power Dissipation (TA= +70°C)
24-Pin Thin QFN (derate 20.8mW/°C above +70°C;
part mountedon 1in2of 1oz copper)........................1667mW
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:LX has clamp diodes to PGND and IN. If continuous current is applied through these diodes, thermal limits must be observed.
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= +3.3V, VCC= VDD= SHDN= MODE = +3.3V, VREFIN= VREF, SKIP= GND, TA
= 0°C to +85°C, unless oth-erwise noted. Typical values are at TA= +25°C.)
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= +3.3V, VCC= VDD= SHDN= MODE = +3.3V, VREFIN= VREF, SKIP= GND, TA
= 0°C to +85°C, unless oth-
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN= +3.3V, VCC= VDD= SHDN= MODE = +3.3V, VREFIN= VREF, SKIP= GND, TA= -40°C to +85°C, unless
otherwise noted. Note 5)
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Note 2:Guaranteed by design. Not production tested.
Note 3:Not tested; guaranteed by layout. Maximum output current may be limited by thermal capability to a lower value.
Note 4:VTARGETis the set output voltage determined by VREFIN, FBSEL0, and FBSEL1.
Note 5:Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN= +3.3V, VCC= VDD= SHDN= MODE = +3.3V, VREFIN= VREF, SKIP= GND, TA= -40°C to +85°C, unless
otherwise noted. Note 5)
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
1.25V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX1515 toc01
LOAD CURRENT (A)
EFFICIENCY (%)0.10.01
1.25V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX1515 toc02
LOAD CURRENT (A)
EFFICIENCY (%)0.10.01
1.25V OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1515 toc03
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)2-2-101
0.9V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX1515 toc04
LOAD CURRENT (A)
EFFICIENCY (%)0.10.01
0.9V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX1515 toc05
LOAD CURRENT (A)
EFFICIENCY (%)0.10.01
0.9V OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1515 toc06
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)2-2-101
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX1515 toc07
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)210-1-2
Typical Operating Characteristics
(MAX1515 Circuit of Figure1, VIN = 2.5V, VDD= VCC= SHDN= MODE = 3.3V, TA = +25°C, unless otherwise noted.)
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Typical Operating Characteristics (continued)(MAX1515 Circuit of Figure1, VIN = 2.5V, VDD= VCC= SHDN= MODE = 3.3V, TA = +25°C, unless otherwise noted.)
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Typical Operating Characteristics (continued)(MAX1515 Circuit of Figure1, VIN = 2.5V, VDD= VCC= SHDN= MODE = 3.3V, TA = +25°C, unless otherwise noted.)
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Typical Operating Characteristics (continued)(MAX1515 Circuit of Figure1, VIN = 2.5V, VDD= VCC= SHDN= MODE = 3.3V, TA = +25°C, unless otherwise noted.)
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
MAX1515
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
Standard Application CircuitThe MAX1515 standard application circuit (Figure 1)
generates a tracking output voltage and a reference
buffer output required for DDR termination regulators.
See Table 1 for component selections. Table 2 lists the
component manufacturers.
Detailed DescriptionThe MAX1515 synchronous, current-mode, constant
off-time, PWM DC-DC converter steps down an input
voltage (VIN) from +1.3V to +3.6V to an output voltage
from +0.5V to +2.7V. The MAX1515 output delivers up
to 3A of continuous current. Internal 40mΩNMOS
power switches improve efficiency, reduce component
count, and eliminate the need for a boost diode or any
external Schottky diodes (Figure 2).
Table 1. Component Selection for Standard Applications
Table 2. Component Suppliers
