MAX1954EUB+ ,Low-Cost, High-Frequency, Current-Mode PWM Buck ControllersApplicationsPrinters and ScannersILIM 1 10 BSTGraphic Cards and Video CardsCOMP 2 9 LXPCs and Serve ..
MAX1954EUB+ ,Low-Cost, High-Frequency, Current-Mode PWM Buck ControllersApplicationsPrinters and ScannersILIM 1 10 BSTGraphic Cards and Video CardsCOMP 2 9 LXPCs and Serve ..
MAX1954EUB+T ,Low-Cost, High-Frequency, Current-Mode PWM Buck ControllersELECTRICAL CHARACTERISTICS (continued)(V = 5V, V - V = 5V, T = -40°C to +85°C, unless otherwise not ..
MAX1957EUB ,Low-Cost / High-Frequency / Current-Mode PWM Buck ControllerFeaturesThe MAX1953/MAX1954/MAX1957 is a family of versa- Low-Cost Current-Mode Controllerstile, e ..
MAX1957EUB+ ,Low-Cost, High-Frequency, Current-Mode PWM Buck ControllersELECTRICAL CHARACTERISTICS(V = 5V, V - V = 5V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX1957EUB+T ,Low-Cost, High-Frequency, Current-Mode PWM Buck ControllersFeaturesThe MAX1953/MAX1954/MAX1957 is a family of versa-♦ Low-Cost Current-Mode Controllerstile, e ..
MAX491CPD ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversGeneral Description ________
MAX491CPD+ ,Low-Power, Slew-Rate-Limited RS-485/RS-422 TransceiversApplicationsMAX3483E/MAX3485E/MAX3486E/MAX3488E/Low-Power RS-485 TransceiversMAX3490E/MAX3491E: +3. ..
MAX491CSD ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversApplications ______________Ordering InformationLow-Power RS-485 TransceiversPART TEMP. RANGE PIN-PA ..
MAX491CSD ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversMAX481/MAX483/MAX485/MAX487–MAX491/MAX148719-0122; Rev 5; 2/96Low-Power, Slew-Rate-LimitedRS-485/RS ..
MAX491CSD ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX491CSD ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversFeaturesThe MAX481, MAX483, MAX485, MAX487–MAX491, and' In µMAX Package: Smallest 8-Pin SOMAX1487 a ..
MAX1953EUB+-MAX1953EUB+T-MAX1953EUB-T-MAX1954EUB+-MAX1954EUB+T-MAX1957EUB+-MAX1957EUB+T
Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers
General DescriptionThe MAX1953/MAX1954/MAX1957 is a family of versa-
tile, economical, synchronous current-mode, pulse-width
modulation (PWM) buck controllers. These step-down
controllers are targeted for applications where cost and
size are critical.
The MAX1953 operates at a fixed 1MHz switching fre-
quency, thus significantly reducing external component
size and cost. Additionally, excellent transient response
is obtained using less output capacitance. The MAX1953
operates from low 3V to 5.5V input voltage and can sup-
ply up to 10A of output current. Selectable current limit is
provided to tailor to the external MOSFETs’ on-resistance
for optimum cost and performance. The output voltage is
adjustable from 0.8V to 0.86VIN.
With the MAX1954, the drain-voltage range on the high-
side FET is 3V to 13.2V and is independent of the supply
voltage. It operates at a fixed 300kHz switching frequen-
cy and can be used to provide up to 25A of output cur-
rent with high efficiency. The output voltage is adjustable
from 0.8V to 0.86VHSD.
The MAX1957 features a tracking output voltage range of
0.4V to 0.86VINand is capable of sourcing or sinking
current for applications such as DDR bus termination
and PowerPC™/ASIC/DSP core supplies. The MAX1957
operates from a 3V to 5.5V input voltage and at a fixed
300kHz switching frequency.
The MAX1953/MAX1954/MAX1957 provide a COMP pin
that can be pulled low to shut down the converter in
addition to providing compensation to the error amplifier.
An input undervoltage lockout (ULVO) is provided to
ensure proper operation under power-sag conditions to
prevent the external power MOSFETs from overheating.
Internal digital soft-start is included to reduce inrush cur-
rent. The MAX1953/MAX1954/MAX1957 are available in
tiny 10-pin µMAX packages.
ApplicationsPrinters and Scanners
Graphic Cards and Video Cards
PCs and Servers
Microprocessor Core Supply
Low-Voltage Distributed Power
Telecommunications and Networking
FeaturesLow-Cost Current-Mode ControllersFixed-Frequency PWMMAX1953
1MHz Switching Frequency
Small Component Size, Low Cost
Adjustable Current LimitMAX1954
3V to 13.2V Input Voltage
25A Output Current Capability
93% Efficiency
300kHz Switching FrequencyMAX1957
Tracking 0.4V to 0.86VINOutput Voltage Range
Sinking and Sourcing Capability of 3AShutdown FeatureAll N-Channel MOSFET Design for Low CostNo Current-Sense Resistor NeededInternal DigitalSoft-StartThermal Overload ProtectionSmall 10-Pin µMAX Package
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
Ordering Information19-2373; Rev 0; 4/02
PART TEMP RANGE PIN-PACKAGE
MAX1953EUB-40°C to +85°C10 µMAX
MAX1954EUB-40°C to +85°C10 µMAX
MAX1957EUB-40°C to +85°C10 µMAX
TOP VIEW
BST
PGNDGND
COMP
ILIM
MAX1953EUB
µMAXIN
Pin ConfigurationsPin Configurations continued at end of data sheet.
†Pg
PowerPC is a trademark of Motorola, Inc.
EVALUATION KIT
AVAILABLE
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
ABSOLUTE MAXIMUM RATINGSStresses 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.
IN, FB to GND...........................................................-0.3V to +6V
LX to BST..................................................................-6V to +0.3V
BST to GND............................................................-0.3V to +20V
DH to LX....................................................-0.3V to (VBST+ 0.3V)
DL, COMP to GND.......................................-0.3V to (VIN+ 0.3V)
HSD, ILIM, REFIN to GND........................................-0.3V to 14V
PGND to GND.......................................................-0.3V to +0.3V
IDH, IDL................................................................±100mA (RMS)
Continuous Power Dissipation (TA= +70°C)
(derate 5.6mW/°C above +70°C)..................................444mW
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(VIN= 5V, VBST- VLX= 5V, TA= -40°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITSOperating Input Voltage Range 3.0 5.5 VHSD Voltage Range MAX1954 only (Note 2) 3.0 13.2 VQuiescent Supply Current VFB = 1.5V, no switching 1 2 mAStandby Supply Current (MAX1953/ MAX1957) VIN = VBST = 5.5V, COMP = GND 220 350 µAStandby Supply Current (MAX1954) VIN = VBST = 5.5V, VHSD = 13.2V,
COMP = GND 220 350 µAUndervoltage Lockout Trip Level Rising and falling VIN, 3% hysteresis 2.50 2.78 2.95 VOutput Voltage Adjust Range (VOUT) 0.8 0.86 x
VIN V
ERROR AMPLIFIERTA = 0°C to +85°C (MAX1953/MAX1954) 0.788 0.8 0.812
TA = -40°C to +85°C (MAX1953/MAX1954) 0.776 0.8 0.812 FB Regulation VoltageMAX1957 only VREFIN
- 8mV VREFIN VREFIN
+ 8mVVTransconductance 70 110 160 µSFB Input Leakage Current VFB = 0.9V 5 500 nAREFIN Input Bias Current VREFIN = 0.8V, MAX1957 only 5 500 nAFB Input Common-Mode Range -0.1 1.5 VREFIN Input Common-Mode Range MAX1957 only -0.1 1.5 VCurrent-Sense Amplifier Voltage Gain Low ILIM = GND (MAX1953 only) 5.67 6.3 6.93 V/VVILIM = VIN or ILIM = open (MAX1953 only) Current-Sense Amplifier Voltage Gain MAX1954/MAX1957 3.15 3.5 3.85 V/V
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck ControllerPARAMETER CONDITIONS MIN TYP MAX UNITSILIM Input Impedance MAX1953 only 50 125 200 kΩVPGND - VLX, ILIM = GND (MAX1953 only) 85 105 125VPGND - VLX, ILIM = open (MAX1953 only) 190 210 235VPGND - VLX, ILIM = IN (MAX1953 only) 290 320 350 Current-Limit ThresholdVPGND – VLX (MAX1954/MAX1957 only) 190 210 235mV
OSCILLATORMAX1953 0.8 1 1.2 MHz Switching Frequency MAX1954/MAX1957 240 300 360 kHzMaximum Duty Cycle Measured at DH 86 89 96 %MAX1953, measured at DH 15 18 Minimum Duty Cycle MAX1954/MAX1957, measured at DH 4.5 5.5 %
SOFT-STARTMAX1953 4 Soft-Start Period MAX1954/MAX1957 3.4 ms
FET DRIVERSDH On-Resistance, High State 2 3 ΩDH On-Resistance, Low State 1.5 3 ΩDL On-Resistance, High State 2 3 ΩDL On-Resistance, Low State 0.8 2 ΩLX, BST Leakage Current VBST = 10.5V, VLX = VIN = 5.5V,
MAX1953/MAX1957 20 µALX, BST, HSD Leakage Current VBST = 18.7V, VLX = 13.2V, VIN = 5.5V
VHSD = 13.2V (MAX1954 only) 30 µA
THERMAL PROTECTIONThermal Shutdown Rising temperature 160 °CThermal Shutdown Hysteresis 15 °C
SHUTDOWN CONTROLCOMP Logic Level Low 3V < VIN < 5.5V 0.25 VCOMP Logic Level High 3V < VIN < 5.5V 0.8 VCOMP Pullup Current 100 µA
ELECTRICAL CHARACTERISTICS (continued)(VIN= 5V, VBST- VLX= 5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)(Note 1)
Note 1:Specifications to -40°C are guaranteed by design and not production tested.
Note 2:HSD and IN are externally connected for applications where VHSD< 5.5V.
ypical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
MAX1954
EFFICIENCY vs. LOAD CURRENTMAX1953 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
VOUT = 2.5V
VOUT = 1.7V
VIN = 5V
CIRCUIT OF FIGURE 2
MAX1953
OUTPUT VOLTAGE vs. LOAD CURRENTMAX1953 toc05
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
VIN = 5V
VIN = 3.3V
CIRCUIT OF FIGURE 1
MAX1954
OUTPUT VOLTAGE vs. LOAD CURRENTMAX1953 toc06
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)4321
VHSD = VIN = 5V
CIRCUIT OF FIGURE 2
MAX1953
EFFICIENCY vs. LOAD CURRENTMAX1953 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
VIN = 3.3V
VIN = 5V
VOUT = 2.5V
CIRCUIT OF FIGURE 1
MAX1957
EFFICIENCY vs. LOAD CURRENTMAX1953 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
VOUT = 1.25V
VIN = 5V
CIRCUIT OF FIGURE 3
MAX1954
EFFICIENCY vs. LOAD CURRENTMAX1953 toc04
LOAD CURRENT (A)
EFFICIENCY (%)15105
VOUT = 1.8V
VIN = 12V
CIRCUIT OF FIGURE 4
MAX1954
OUTPUT VOLTAGE vs. LOAD CURRENTMAX1953 toc07
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)4321
VHSD = VIN = 5V
CIRCUIT OF FIGURE 2
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX1953
FREQUENCY vs. INPUT VOLTAGEMAX1953 toc13
INPUT VOLTAGE (V)
FREQUENCY (MHz)
TA = -40°C
TA = +85°C
TA = +25°C
VOUT = 2.5V
MAX1954/MAX1957
FREQUENCY vs. INPUT VOLTAGEMAX1953 toc14
INPUT VOLTAGE (V)
FREQUENCY (kHz)
TA = -40°C
TA = +25°C
TA = +85°C
VOUT = 1.25V
MAX1957
OUTPUT VOLTAGE vs. LOAD CURRENTMAX1953 toc08
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)10-1-2
VIN = 5V
CIRCUIT OF FIGURE 3
MAX1954
OUTPUT VOLTAGE vs. INPUT VOLTAGEMAX1953 toc11
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
ILOAD = 0
ILOAD = 5A
CIRCUIT OF FIGURE 2
MAX1957
OUTPUT VOLTAGE vs. INPUT VOLTAGEMAX1953 toc12
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
ILOAD = 0
ILOAD = 3A
CIRCUIT OF FIGURE 3
MAX1953
OUTPUT VOLTAGE vs. INPUT VOLTAGEMAX1953 toc09
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
ILOAD = 3A
ILOAD = 0
CIRCUIT OF FIGURE 1
MAX1954
OUTPUT VOLTAGE vs. INPUT VOLTAGEMAX1953 toc10
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
ILOAD = 0
ILOAD = 5A
CIRCUIT OF FIGURE 2
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
MAX1953
NO-LOAD SWITCHING WAVEFORMSMAX1953 toc18
2µs/div
ILX
2A/div
5V/div
5V/div
5V/div
MAX1957
LOAD TRANSIENTMAX1953 toc17
VOUT
AC-COUPLED
ILOAD
50mV/div
-3A
400µs/div
MAX1953
LOAD TRANSIENTCIRCUIT OF FIGURE 1
400µs/div
100mV/div
1.5A
VOUT
AC-COUPLED
ILOAD
MAX1953 toc15
MAX1954
LOAD TRANSIENTMAX1953 toc16
100mV/div
2.5AILOAD
VOUT
AC-COUPLED
400µs/div
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX1953
FULL-LOAD SWITCHING WAVEFORMSMAX1953 toc19
2µs/div
ILX
2A/div
5V/div
5V/div
5V/div
MAX1954/MAX1957
SHORT-CIRCUIT SWITCHING WAVEFORMSMAX1953 toc23
4µs/div
ILX
5A/div
10V/div
5V/div
10V/div
MAX1954/MAX1957
FULL-LOAD SWITCHING WAVEFORMSMAX1953 toc22
4µs/div
ILX
2A/div
10V/div
5V/div
10V/div
MAX1954/MAX1957
NO-LOAD SWITCHING WAVEFORMSMAX1953 toc21
4µs/div
ILX
2A/div
10V/div
5V/div
10V/div
MAX1953
SHORT-CIRCUIT SWITCHING WAVEFORMSMAX1953 toc20
2µs/div
ILX
5A/div
5V/div
5V/div
5V/div
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
Pin DescriptionPINMAX1953 MAX1954 MAX1957 NAME FUNCTION1 — — ILIMILIM Sets the Current-Limit Threshold for the Low-Side N-Channel
MOSFET, as well as the Current-Sense Amplifier Gain. Connect to IN
for 320mV, leave floating for 210mV, or connect to GND for 105mV
current-limit threshold.— 1 — HSD HSD Senses the Voltage at the Drain of the High-Side N-Channel
MOSFET. Connect to the high-side MOSFET drain using a Kelvin
connection.— — 1 REFIN REFIN Sets the FB Regulation Voltage. Drive REFIN with the desired
FB regulation voltage using an external resistor-divider. Bypass to
GND with a 0.1µF capacitor.2 2 2 COMP Compensation and Shutdown Control Pin. Connect an RC network to
compensate control loop. Drive to GND to shut down the IC.3 3 3 FB
Feedback Input. Regulates at VFB = 0.8V (MAX1953/MAX1954) or
REFIN (MAX1957). Connect FB to a resistor-divider to set the output
voltage (MAX1953/MAX1954). Connect to output through a decoupling
resistor (MAX1957).4 4 4 GND Ground5 5 5 IN
Input Voltage (3V to 5.5V). Provides power for the IC. For the
MAX1953/MAX1957, IN serves as the current-sense input for the high-
side MOSFET. Connect to the drain of the high-side MOSFET
(MAX1953/MAX1957). Bypass IN to GND close to the IC with a
0.22µF (MAX1954) capacitor. Bypass IN to GND close to the IC with
10µF and 4.7µF in parallel (MAX1953/MAX1957) capacitors. Use
ceramic capacitors.6 6 6 DLLow - S i d e G ate- D r i ve Outp ut. D r i ves the synchr onous- r ecti fi er M O S FE T.w i ng s fr om P GN D to V IN .7 7 7 PGND Power Ground. Connect to source of the synchronous rectifier close to
the IC.8 8 8 DH High-Side Gate-Drive Output. Drives the high-side MOSFET. DH is a
floating driver output that swings from VLX to VBST.9 9 9 LX Master Controller Current-Sense Input. Connect LX to the junction of
the MOSFETs and inductor. LX is the reference point for the current
limit.10 10 10 BSTBoost Capacitor Connection for High-Side Gate Driver. Connect a
0.1µF ceramic capacitor from BST to LX and a Schottky diode to IN.
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck ControllerREFERENCE
AND
SOFT-START
DAC
REFIN
(MAX1957
ONLY)
GND
COMP
0.5V
SHUTDOWN
COMPARATOR
ERROR
AMPLIFIER
SLOPE
COMPENSATION
THERMAL
LIMITUVLO
PWM
CONTROL
CIRCUITRY
CLOCK
SHORT-CIRCUIT
CURRENT-LIMIT
CIRCUITRY
ILIM
(MAX1953
ONLY)
CURRENT-LIMIT
COMPARATOR
PGND
CURRENT-
SENSE
CIRCUITRY
BST
HSD
(MAX1954
ONLY)
MAX1953
MAX1954
MAX1957
Functional DiagramILIM
COMP
GND
BST
PGND
MAX1953
OUTPUT
0.8V TO 0.86VIN
INPUT
3V TO 5.5V
Typical Operating Circuit
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
Detailed DescriptionThe MAX1953/MAX1954/MAX1957 are single-output,
fixed-frequency, current-mode, step-down, PWM, DC-
DC converter controllers. The MAX1953 switches at
1MHz, allowing the use of small external components for
small applications. Table 1 lists suggested components.
The MAX1954 switches at 300kHz for higher efficiency
and operates from a wider range of input voltages.
Figure 1 is the MAX1953 typical application circuit. The
MAX1953/MAX1954/MAX1957 are designed to drive a
pair of external N-channel power MOSFETs in a syn-
chronous buck topology to improve efficiency and cost
compared with a P-channel power MOSFET topology.
The on-resistance of the low-side MOSFET is used for
short-circuit current-limit sensing, while the high-side
MOSFET on-resistance is used for current-mode feed-
back and current-limit sensing, thus eliminating the
need for current-sense resistors. The MAX1953 has
three selectable short-circuit current-limit thresholds:
105mV, 210mV, and 320mV. The MAX1954 and
MAX1957 have 210mV fixed short-circuit current-limit
thresholds. The MAX1953/MAX1954/MAX1957 accept
input voltages from 3V to 5.5V. The MAX1954 is config-
ured with a high-side drain input (HSD) allowing an
extended input voltage range of 3V to 13.2V that is
independent of the input supply (Figure 2). The
MAX1957 is tailored for tracking output voltage applica-
tions such as DDR bus termination supplies, referred to
as VTT. It utilizes a resistor-divider network connected
to REFIN to keep the 1/2 ratio tracking between VTT
and VDDQ(Figure 3). The MAX1957 can source and
sink up to 3A. Figure 4 shows the MAX1954 20A circuit.
DC-DC Converter Control ArchitectureThe MAX1953/MAX1954/MAX1957 step-down convert-
ers use a PWM, current-mode control scheme. An inter-
nal transconductance amplifier establishes an integrated
error voltage. The heart of the PWM controller is an open-
loop comparator that compares the integrated voltage-
feedback signal against the amplified current-sense
signal plus the slope compensation ramp, which are
summed into the main PWM comparator to preserve
inner-loop stability and eliminate inductor staircasing. At
each rising edge of the internal clock, the high-side
MOSFET turns on until the PWM comparator trips or the
maximum duty cycle is reached. During this on-time, cur-
rent ramps up through the inductor, storing energy in a
magnetic field and sourcing current to the output. The
current-mode feedback system regulates the peak
inductor current as a function of the output voltage error
signal. The circuit acts as a switch-mode transconduc-
tance amplifier and pushes the output LC filter pole nor-
mally found in a voltage-mode PWM to a higher
frequency.
During the second half of the cycle, the high-side MOS-
FET turns off and the low-side MOSFET turns on. The
inductor releases the stored energy as the current ramps
down, providing current to the output. The output capaci-
tor stores charge when the inductor current exceeds the
required load current and discharges when the inductor
current is lower, smoothing the voltage across the load.
Under overload conditions, when the inductor current
exceeds the selected current-limit (see the Current Limit
Circuitsection), the high-side MOSFET is not turned on
at the rising clock edge and the low-side MOSFET
remains on to let the inductor current ramp down.
The MAX1953/MAX1954/MAX1957 operate in a forced-
PWM mode. As a result, the controller maintains a con-
stant switching frequency, regardless of load, to allow for
easier postfiltering of the switching noise.
DESIGNATIONMAX1953MAX1954MAX195720A CIRCUIT10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
0.22µF, 10V X7R CER
Kemet
C0603C224M8RAC
3 x 22µF, 6.3V X5R CER
Taiyo Yuden
JMK316BJ226ML
0.22µF, 10V X7R CER
Kemet
C0603C224M8RAC
0.1µF, 50V X7R CER
Taiyo Yuden
UMK107BJ104KA
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
0.1µF, 50V X7R CER
Taiyo Yuden
UMK107BJ104KA
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
0.1µF, 50V X7R CER
Taiyo Yuden
UMK107BJ104KA
270µF, 2V SP Polymer
Panasonic
EEFUEOD271R
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
Table 1. Suggested Components
MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
DESIGNATIONMAX1953MAX1954MAX195720A CIRCUIT10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
180µF, 4V SP Polymer
Panasonic
EEFUEOG181R
270µF, 2V SP Polymer
Panasonic
EEFUEOD271R
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
4.7µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ475MG
270µF, 2V SP Polymer
Panasonic
EEFUEOD271R
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG——
4.7µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ475MG
0.1µF, 50V X7R CER
Taiyo Yuden
UMK107BJ104KA——
0.1µF, 50V X7R CER
Taiyo Yuden
UMK107BJ104KA
270µF, 2V SP polymer
Panasonic
EEFUEOD271R
C9-C13———
270µF, 2V SP polymer
Panasonic
EEFUEOD271R
C14——
1500pF, 50V X7R CER
Murata
GRM39X7R152K50
270pF, 10V X7R CER
Kemet
C0402C271M8RAC
1000pF, 10V X7R CER
Kemet
C0402C102M8RAC
470pF, 50V X7R CER
Murata
GRM39X7R471K50
560pF, 10V X7R CER
Kemet
C0402C561M8RAC—
47pF, 10V C0G CER
Kemet
C0402C470K8GAC
68pF, 50V COG CER
Murata
GRM39COG680J50
15pF, 10V C0G CER
Kemet
C0402C150K8GAC
Schottky diode
Central Semiconductor
CMPSH1-4
Schottky diode
Central Semiconductor
CMPSH1-4
Schottky diode
Central Semiconductor
CMPSH1-4
Schottky diode
Central Semiconductor
CMPSH1-41µH 3.6A
Toko 817FY-1R0M
2.7µH 6.6A
Coilcraft
DO3316-272HC
2.7µH 6.6A
Coilcraft
DO3316-272HC
0.8µH 27.5A
Sumida
CEP125U-0R8
N1-N2
Dual MOSFET 20V 5A
Fairchild
FDS6898A
Dual MOSFET 20V
Fairchild
FDS6890A
Dual MOSFET 20V
Fairchild
FDS6898A
N-channel 30V
International Rectifier
IRF7811W
N3-N4———N-channel 30V
Siliconix Si4842DY16.9kΩ 1%9.09kΩ 1%2kΩ 1%10kΩ 1%8.06kΩ 1%8.06kΩ 1%2kΩ 1%8.06kΩ 1%10kΩ 5%33kΩ 5%62kΩ 5%51.1kΩ 5%270kΩ 5%
Table 1. Suggested Components (continued)
