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MAX1762EUB+ |MAX1762EUBMAXN/a35avaiHigh-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks
MAX1791EUB+ |MAX1791EUBMAXIMN/a22avaiHigh-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks


MAX1762EUB+ ,High-Efficiency, 10-Pin µMAX, Step-Down Controllers for NotebooksELECTRICAL CHARACTERISTICS(V = 15V, VL enabled, C = 1µF, C = 0.1µF, T = 0 to +85°C, unless otherwis ..
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MAX1763EEE ,1.5A, Low-Noise, 1MHz, Step-Up DC-DC ConverterapplicationsDigital Cordless Hand-Heldthat require constant-frequency operation at all loadPhones I ..
MAX1763EEE+ ,1.5A, Low-Noise, 1MHz, Step-Up DC-DC ConverterELECTRICAL CHARACTERISTICS(CLK/SEL = ONB = FB = PGND = GND, ISET = REF, OUT = POUT, V = V = V = 3.6 ..
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MAX458CQH ,8x4 Video Crosspoint Switches with BuffersBlock Diagram_________________Pin Configurations8 BUFFERED 8 x 4 4 75Ω

MAX1762EUB+-MAX1791EUB+
High-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks
General Description
The MAX1762/MAX1791 PWM step-down controllers
provide high efficiency, excellent transient response,
and high DC output accuracy needed for stepping
down high-voltage batteries to generate low-voltage
CPU core, I/O, and chipset RAM supplies in notebook
computers and PDAs.
Maxim’s proprietary Quick-PWM™pulse-width modula-
tor is a free-running constant on-time type with input
feed-forward. Its high operating frequency (300kHz)
allows small external components to be utilized in PC
board area-critical applications such as subnotebook
computers and smart phones. PWM operation occurs
at heavy loads, and automatic switchover to pulse-skip-
ping operation occurs at lighter loads. The external
high-side p-channel and low-side n-channel MOSFETs
require no bootstrap components. The MAX1762/
MAX1791 are simple, easy to compensate, and do not
have the noise sensitivity of conventional fixed-frequen-
cy current-mode PWMs.
These devices achieve high efficiency at a reduced
cost by eliminating the current-sense resistor found in
traditional current-mode PWMs. Efficiency is further
enhanced by their ability to drive synchronous-rectifier
MOSFETs. The MAX1762/MAX1791 come in a 10-pin
µMAX package and offer two fixed voltages (Dual
Mode™) for each device, 1.8V/2.5V/adj (MAX1762)and
3.3V/5.0V/adj (MAX1791).
________________________Applications

NotebooksHandy-Terminals
SubnotebooksPDAs
Digital CamerasSmart Phones
1.8V/2.5V Logic
and I/O Supplies
Features
High Operating Frequency (300kHz)No Current-Sense ResistorAccurate Current Limit±1% Total DC Error over Line and During
Continuous Conduction
Dual Mode Fixed Output
1.8V/2.5V/adj (MAX1762)
3.3V/5.0V/adj (MAX1791)
0.5V to 5.5V Output Adjust Range5V to 20V Input Range Automatic Light-Load Pulse Skipping OperationFree-Running On-Demand PWMFoldback Mode™UVLOPFET/NFET Synchronous Buck4.65V at 25mA Linear Regulator Output5µA Shutdown Supply Current230µA Quiescent Supply Current10-Pin µMAX Package
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks

19-1923; Rev 1; 10/05
EVALUATION KIT
AVAILABLE
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX1762EUB
-40°C to +85°C10 µMAX
MAX1791EUB
-40°C to +85°C10 µMAX
GNDOUT
REF
SHDN
VBATT
(5V TO 20V)
VOUT
1.8V/3.3V
MAX1762
MAX1791
Typical Operating Circuit
OUT
REF
MAX1762
MAX1791
μMAX
TOP VIEW
GNDSHDN
Pin Configuration

Quick-PWM, Dual Mode, and Foldback Mode are a trade-
marks of Maxim Integrated Products, Inc.
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks
ABSOLUTE MAXIMUM RATINGS

VP, SHDNto GND..................................................-0.3V to +22V
VP to VL..................................................................-0.3V to +22V
OUT, VL to GND.......................................................-0.3V to +6V
DL, FB, REF to GND....................................-0.3V to (VL + 0.3V)
DH to GND....................................................-0.3V to (VP + 0.3V)
CS to GND....................................................-2.0V to (VP + 0.3V)
REF Short Circuit to GND...........................................Continuous
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (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

(VVP= 15V, VL enabled, CVL= 1µF, CREF= 0.1µF, TA= 0 to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
(Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

VP Input Voltage RangeVVP520V
VL Input Voltage RangeVVLVL (overdriven)4.755.25V
OUT Output Voltage
(MAX1762, 1.8V Fixed)VOUTVVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = GND, continuous conduction mode1.7731.81.827V
OUT Output Voltage
(MAX1762, 2.5V Fixed)VOUTVVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = VL, continuous conduction mode2.4632.52.538V
OUT Output Voltage
(MAX1791, 3.3V Fixed)VOUTVVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = GND, continuous conduction mode3.2503.33.350V
OUT Output Voltage
(MAX1791, 5V Fixed)VOUTVVP = 7V to 20V, VVL = 4.75V to 5.25V,
FB = VL, continuous conduction mode4.92555.075V
OUT Output Voltage (Adj Mode)VVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = OUT, continuous conduction mode1.2311.2501.269V
Output Voltage Adjust Range0.55.5V
OUT Input ResistanceAdjustable-output mode3008001700kΩ
FB Input Bias CurrentVFB = 1.3V-0.10.1µA
Soft-Start Ramp TimeZero to full ILIM1700µs
VOUT = 1.25V, VVP = 6V666740814On-Time (Note 2)tONVOUT = 5V, VVP = 6V255028303110ns
Minimum Off-TimetOFF(Note 2)300400500ns
VL Quiescent Supply CurrentFB = GND, VVL = 5V, OUT forced above the
regulation point153260µA
VVL = float227410
VP Quiescent Supply Current
FB = GND, OUT forced
above the regulation point,
VVP = 20VVVL = 5V93200
VL Shutdown Supply CurrentVVL = 5V, SHDN = GND215µA
VP Shutdown Supply CurrentS HD N = GN D , m easur ed at V P , V V L = 0 or 5V 412µA
VL Output VoltageILOAD = 0 to 25mA, VVP = 5V to 20V4.54.654.75V
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.
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks
ELECTRICAL CHARACTERISTICS (continued)

(VVP= 15V, VL enabled, CVL= 1µF, CREF= 0.1µF, TA= 0 to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
(Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Reference VoltageVVL = 4.75V to 5.25V, no load1.9822.02V
Reference Load RegulationIREF = 0 to 50µA0.01V
REF Sink CurrentREF in regulation10µA
REF Fault Lockout VoltageFalling edge1.6V
Output Undervoltage Threshold
(Foldback)With respect to regulation point, no load607080%
Output Undervoltage Lockout
Time (Foldback)
From SHDN signal going high VOUT < 0.6 x
regulation point102042ms
Current-Limit ThresholdVILIM-90-100-110mV
Thermal Shutdown ThresholdHysteresis = 10oC160oC
VL Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, PWM
disabled below this level4.14.4V
DH Gate Driver On-ResistanceVVP = 6V to 20V, measure at 50mA58Ω
DL Gate Driver On-Resistance
(Pullup)DL, high state, measure at 50mA58Ω
DL Gate Driver On-Resistance
(Pulldown)DL, low state, measure at 50mA15Ω
DH Gate Driver Source/Sink
CurrentVDH = 3V, VVP = 6V0.6A
DL Gate Driver Sink CurrentVDL = 2.5V0.9A
DL Gate Driver Source CurrentVDL = 2.5V0.5A
SHDN Logic Input High
Threshold VoltageVIH1.6V
SHDN Logic Input Low
Threshold VoltageVIL0.6V
MAX1762 VOUT = 1.8V fixed
MAX1791 VOUT = 3.3V fixed50100150mV
MAX1762 VOUT = 2.5V fixedDual Mode Threshold Voltage
MAX1791 VOUT = 5V fixed2.53.254V
SHDN Logic Input CurrentSHDN = 0 or 5V-2+2µA
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks
ELECTRICAL CHARACTERISTICS

(VVP= 15V, VL enabled, CVL= 1µF, CREF= 0.1µF, TA= -40 to +85°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

VP Input Voltage RangeVVP520V
VL Input Voltage RangeVVLVL (overdriven)4.755.25V
OUT Output Voltage
(MAX1762, 1.8V Fixed)VOUTVVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = GND, continuous conduction mode1.7731.827V
OUT Output Voltage
(MAX1762, 2.5V Fixed)VOUTVVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = VL, continuous conduction mode2.4632.538V
OUT Output Voltage
(MAX1791, 3.3V Fixed)VOUTVVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = GND, continuous conduction mode3.2503.350V
OUT Output Voltage
(MAX1791, 5V Fixed)VOUTVVP = 7V to 20V, VVL = 4.75V to 5.25V,
FB = VL, continuous conduction mode4.9255.075V
OUT Output Voltage (adj Mode)VVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = OUT, continuous conduction mode1.2311.269V
FB Input Bias CurrentVFB = 1.3V-0.20.2µA
VOUT = 1.25V, VVP = 6V666814On-Time (Note 2)tONVOUT = 5V, VVP = 6V25503110ns
Minimum Off-TimetOFF(Note 2)250550ns
VL Quiescent Supply CurrentFB = GND, VVL = 5V, OUT forced above the
regulation point260µAV L = float410VP Quiescent Supply CurrentFB = GND, OUT forced above
the regulation point VVP = 20VV V L = 5V 200µA
VL Shutdown Supply CurrentVVL = 5V, SHDN = GND15µA
VP Shutdown Supply CurrentS HD N = GN D , m easur ed at V P , V V L = 0 or 5V 12µA
VL Output VoltageILOAD = 0 to 25mA, VVP = 5V to 20V4.54.75V
Reference VoltageVVL = 4.75V to 5.25V, no load1.982.02V
Reference Load RegulationIREF = 0 to 50µA0.01V
REF Sink CurrentREF in regulation10µA
Output Undervoltage Threshold
(Foldback)With respect to regulation point, no load6080%
Output Undervoltage Lockout
Time (Foldback)
From SHDN signal going high, VOUT < 0.6 x
regulation point1042ms
Current-Limit ThresholdVILIM-90-110mV
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
Note 2:
One-shot times are measured at the DH pin (VP = 15V, CDH= 400pF, 90% point to 90% point; see drawing below for
measurement details).
ELECTRICAL CHARACTERISTICS (continued)

(VVP= 15V, VL enabled, CVL= 1µF, CREF= 0.1µF, TA= -40 to +85°C,unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

VL Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, PWM
disabled below this level4.14.4V
SHDN Logic Input High
Threshold VoltageVIH1.6V
SHDN Logic Input Low
Threshold VoltageVIL0.6V
MAX1762 VOUT = 1.8V fixed
MAX1791 VOUT = 3.3V fixed50150mV
MAX1762 VOUT = 2.5V fixedDual Mode Threshold Voltage
MAX1791 VOUT = 5V fixed2.54V90%90%
tON
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks
Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)
0.1110100100010,000
MAX1762
EFFICIENCY vs. LOAD (2.5V)

MAX1762/91 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)40
VVP = 5V
VVP = 12V
VVP = 7V
VVP = 18V
0.1110100100010,000
MAX1791
EFFICIENCY vs. LOAD (3.3V)

MAX1762/91 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)40
VVP = 18V
VVP = 12V
VVP = 7V
VVP = 5V
0.1110100100010,000
MAX1791
EFFICIENCY vs. LOAD (3.0V)

MAX1762/91 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)40
VVP = 7V
VVP = 18V
VVP = 12V
VVP = 5V
VL VOLTAGE ERROR vs. OUTPUT CURRENT
MAX1762/91 toc08
VL CURRENT (mA)
VL VOLTAGE ERROR (%)
VVP = 12V
VOUT = 2.5V
0.1110100100010,000
MAX1791
EFFICIENCY vs. LOAD (5V)

MAX1762/91 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)40VVP = 7V
VVP = 18V
VVP = 12V
FREQUENCY vs. SUPPLY VOLTAGE
MAX1762/91 toc07
SUPPLY VOLTAGE (V)
FREQUENCY (kHz)
VOUT = 3.3V
VOUT = 5.0V
VOUT = 2.5V
VOUT = 1.8V
LOAD = 1A
0.1110100100010,000
MAX1762
EFFICIENCY vs. LOAD (1.8V)

MAX1762/91 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)40
VVP = 18V
VVP = 12V
VVP = 5V
VVP = 7V
0.1110100100010,000
MAX1762
EFFICIENCY vs. LOAD (1V)

MAX1762/91 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)40
VVP = 7V
VVP = 12V
VVP = 5V
VVP = 18V
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks
Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE

MAX1762/91 toc12
VOUT
AC-COUPLED
100mV/div
2A/div
100μs/div
VVP = 12V, IL = 0 TO 2A, VOUT = 2.5V
LOAD-TRANSIENT RESPONSE

MAX1762/91 toc13
VOUT
AC-COUPLED
100mV/div
ILOAD
2A/div
100μs/div
VVP = 12V, ILOAD = 0 TO 2A, VOUT = 1.8V
LINE-TRANSIENT RESPONSE

MAX1762/91 toc11
1V/div
VOUT
AC-COUPLED
20mV/div
100μs/div
VVP = 7.5V TO 8V, ILOAD = 0, VOUT = 2.5V
SHUTDOWN AND STARTUP WAVEFORMS
(IL = 300mA)

MAX1762/91 toc15
VOUT
2V/div
ILX
1A/div
SHDN
5V/div
2ms/div
VVP = 8V, ILOAD = 300mA, VOUT = 2.5V
SHUTDOWN AND STARTUP WAVEFORMS
(IL = 2.5A)

MAX1762/91 toc16
ILX
2A/div
SHDN
5V/div
VOUT
2V/div
2ms/div
VVP = 8V, ILOAD = 2.5A, VOUT = 2.5V
OUTPUT OVERLOAD WAVEFORMS

MAX1762/91 toc14
100μs/div
VVP = 12V, ILOAD = 0 TO 3A, VOUT = 2.5V
VOUT
AC-COUPLED
ILOAD
2A/div
SUPPLY CURRENT vs. INPUT VOLTAGE
(SHUTDOWN)
MAX1762/91 toc10
VP (V)
SUPPLY CURRENT (µA)
NO LOAD
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX1762/91 toc09
VP (V)
SUPPLY CURRENT (
VOUT = 3.3V
NO LOAD
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks
Standard Application Circuit

The standard application circuit (Figure 1) generates a
low-voltage output for general-purpose use in notebook
computers (I/O supply, fixed CPU, core supply, and
DRAM supply). This DC-DC converter steps down bat-
tery voltage from 5V to 20V with high efficiency and
accuracy to a fixed voltage of 1.8V/2.5V/adj (MAX1762)
or 3.3V/5.0V/adj (MAX1791). Both the MAX1762 and
MAX1791 can be configured for adjustable output volt-
ages (VOUT > 1.25V), using a resistive voltage-divider
from VOUTto FB to adjust the output voltage (Figure 2).
Similarly, Figure 3 shows an application circuit for VOUT
< 1.25V, where a resistive voltage-divider from REF to
FB is used to set the output voltage. Figure 4 shows
how to set the regulator’s current limit with an external
sense resistor from CS to GND. Table 1 lists the com-
ponents for each application circuit, and Table 2 con-
tains contact information for the component
manufacturers.
Detailed Description

The MAX1762/MAX1791 step-down controllers are tar-
geted at low-voltage chipsets and RAM power supplies
for notebook and subnotebook computers, with addi-
tional applications in digital cameras, PDAs, and
handy-terminals. Maxim’s proprietary Quick-PWM
pulse-width modulator (Figure 5) is specifically
designed for handling fast load steps while maintaining
a relatively constant operating frequency (300kHz) over
a wide range of input voltages (5V to 20V). The
MAX1762 has fixed 1.8V or 2.5V outputs, while the
MAX1791 has fixed 3.3V or 5.0V output voltages. Using
an external resistive divider, VOUTcan be set between
0.5V and 5.5V on either device. Quick-PWM architec-
ture circumvents the poor load-transient response of
fixed-frequency current-mode PWMs. This type of
design avoids the problems commonly encountered
with conventional constant-on-time and constant-off-
time PWM schemes.
PINNAMEFUNCTION

1VL
+4.65V Linear Regulator Output. Serves as the supply input for the DL gate driver and supplies up to
25mA to external loads. VL can be overdriven using an external 5V supply. Bypass VL to GND with
at least a 1µF ceramic capacitor.REF2V Reference Voltage Output. Bypass to GND with 0.1µF ceramic capacitor. REF can deliver up to
50μA for external loads.
3FB
Feedback Input. Connect to an external resistive divider from OUT to GND in adjustable version.
Regulates to 1.25V. FB also serves as Dual Mode select pin. Connect FB to GND for a fixed 1.8VM AX 1762) or 3.3V (M AX 1791) outp ut, or to VL for a fi xed 2.5V (M AX 1762) or 5.0V ( M AX 1791) outp ut.OUTOutput Voltage Connection. OUT is used for sensing the output voltage to determine the on-time and
also serves as the feedback input in fixed-output modes.SHDNShutdown Input. Connect to a voltage less than VIL (<0.6V) to shut down the device. Connect to a
voltage greater than VIH (>1.6V) for normal operation.GNDAnalog and Power Ground
7DLLow-Side Gate Driver Output. DL swings between VL and GND.
8CS
Current-Sense Connection. For lossless current sensing, connect CS to the junction of the MOSFETs
and inductor. For more accurate current sensing, connect CS to a current-sense resistor from the
source of the low-side switch to GND.
9DHHigh-Side Gate Driver Output. DH swings between VP and GND.VPBattery Voltage Supply Input. Used for PWM one-shot timing and as the input for the VL regulator
and DH gate drivers.
Pin Description
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks

Figure 1. Typical Application Circuit for Fixed VoltageL17μH
C2
1μF
0.1μF
GND10μF220μFOUT
REF
SHDN
VVP
VOUT
MAX1762
MAX1791
10Ω
1μF
Figure 2. Typical Application Circuit for Adjustable Output VOUT > 1.25V7μH
1μF
0.1μF
GND
10μF
220μFOUT
REF
SHDN
VVP
VOUT
MAX1762
MAX1791
10Ω
1μF
Figure 3. Typical Application Circuit for VOUT< 1.25V7μH
1μF
0.1μF
GND
10μF220μFOUT
REF
SHDN
VVP
VOUT
MAX1762
MAX1791
10Ω
1μF
MAX1762/MAX1791
High-Efficiency, 10-Pin µMAX,Step-Down
Controllers for Notebooks

Figure 4. Operation with External Current-Sense Resistor10μH
1μF
0.1μF
GND
10μF150μFOUT
REF
SHDN
VVP
VOUT
MAX1762
MAX1791
10Ω
1μF
Table 1. Component Selection for Standard Applications
COMPONENT1.8V/2.5V/3.3V/5.0V AT 2A1V AT 2A
Input Voltage Range5V to 20V5V to 20V
Inductor (µH)75.2

L1 InductorCDRH104-7R0NC
Sumida
CDRH104-5R2NC
Sumida
Q1 MOSFETSNDS8958A
Fairchild
SI4539ADY
Fairchild
C1 Input CapacitorTMK432BJ106KM
Taiyo Yuden
TMK432BJ106
Taiyo Yuden
C2 VL CapEMK3160J105KL
Taiyo Yuden
LMK316BJ475
Taiyo Yuden
C3 REF CapUMK316BI104KH
Taiyo Yuden
UMK316BI104KH
Taiyo Yuden
C4 Output Cap10TPB220M
Sanyo
6TPB150M
Sanyo
ic,good price


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