900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1791 Datasheet

High-Efficiency / 10-Pin MAX / Step-Down Controllers for Notebooks

No Preview Available !

19-1923; Rev 0; 1/01
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
Notebooks
Subnotebooks
Handy-Terminals
PDAs
Digital Cameras
Smart Phones
1.8V/2.5V Logic
and I/O Supplies
Typical Operating Circuit
VBATT
(5V TO 20V)
VL VP
MAX1762
MAX1791
REF DH
FB CS
OUT DL
SHDN
GND
VOUT
1.8V/3.3V
Features
o High Operating Frequency (300kHz)
o No Current-Sense Resistor
o Accurate Current Limit
o ±1% Total DC Error over Line and During
Continuous Conduction
o Dual Mode Fixed Output
1.8V/2.5V/adj (MAX1762)
3.3V/5.0V/adj (MAX1791)
o 0.5V to 5.5V Output Adjust Range
o 5V to 20V Input Range
o Automatic Light-Load Pulse Skipping Operation
o Free-Running On-Demand PWM
o Foldback Mode™ UVLO
o PFET/NFET Synchronous Buck
o 4.65V at 25mA Linear Regulator Output
o 5µA Shutdown Supply Current
o 230µA Quiescent Supply Current
o 10-Pin µMAX Package
PART
MAX1762EUB
MAX1791EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
TOP VIEW
Pin Configuration
VL 1
REF 2
FB 3
OUT 4
SHDN 5
MAX1762
MAX1791
µMAX
10 VP
9 DH
8 CS
7 DL
6 GND
Quick-PWM, Dual Mode, and Foldback Mode are a trade-
marks of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1791 Datasheet

High-Efficiency / 10-Pin MAX / Step-Down Controllers for Notebooks

No Preview Available !

High-Efficiency, 10-Pin µMAX, Step-Down
Controllers for Notebooks
ABSOLUTE MAXIMUM RATINGS
VP, SHDN to 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 .......................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature.........................................-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
(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)
PARAMETER
VP Input Voltage Range
VL Input Voltage Range
OUT Output Voltage
(MAX1762, 1.8V Fixed)
OUT Output Voltage
(MAX1762, 2.5V Fixed)
OUT Output Voltage
(MAX1791, 3.3V Fixed)
OUT Output Voltage
(MAX1791, 5V Fixed)
OUT Output Voltage (Adj Mode)
Output Voltage Adjust Range
OUT Input Resistance
FB Input Bias Current
Soft-Start Ramp Time
On-Time (Note 2)
Minimum Off-Time (Note 2)
VL Quiescent Supply Current
VP Quiescent Supply Current
VL Shutdown Supply Current
VP Shutdown Supply Current
VL Output Voltage
SYMBOL
VVP
VVL
VOUT
CONDITIONS
VL (overdriven)
VVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = GND, continuous conduction mode
VOUT
VVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = VL, continuous conduction mode
VOUT
VVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = GND, continuous conduction mode
VOUT
VVP = 7V to 20V, VVL = 4.75V to 5.25V,
FB = VL, continuous conduction mode
VVP = 5V to 20V, VVL = 4.75V to 5.25V,
FB = OUT, continuous conduction mode
Adjustable-output mode
VFB = 1.3V
Zero to full ILIM
tON
VOUT = 1.25V, VVP = 6V
VOUT = 5V, VVP = 6V
tOFF
FB = GND, VVL = 5V, OUT forced above the
regulation point
FB = GND, OUT forced
above the regulation point,
VVP = 20V
VVL = float
VVL = 5V
VVL = 5V, SHDN = GND
SHDN = GND, measured at VP, VVL = 0 or 5V
ILOAD = 0 to 25mA, VVP = 5V to 20V
MIN
5
4.75
1.773
2.463
3.250
4.925
1.231
0.5
300
-0.1
666
2550
300
4.5
TYP
1.8
MAX
20
5.25
UNITS
V
V
1.827
V
2.5 2.538
V
3.3 3.350
V
5 5.075 V
1.250 1.269
800
1700
740
2830
400
5.5
1700
0.1
814
3110
500
153 260
227
93
2
4
4.65
410
200
15
12
4.75
V
V
k
µA
µs
ns
ns
µA
µA
µA
µA
V
2 _______________________________________________________________________________________


Part Number MAX1791
Description High-Efficiency / 10-Pin MAX / Step-Down Controllers for Notebooks
Maker Maxim
Total Page 20 Pages
PDF Download

MAX1791 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 MAX1790 Low-Noise Step-Up DC-DC Converters
Maxim Integrated Products
2 MAX1791 High-Efficiency / 10-Pin MAX / Step-Down Controllers for Notebooks
Maxim
3 MAX1792 500mA Low-Dropout Linear Regulator in MAX
Maxim
4 MAX1793 Low-Dropout / Low IQ / 1A Linear Regulator
Maxim
5 MAX1795 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown
Maxim
6 MAX1796 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown
Maxim
7 MAX1797 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown
Maxim
8 MAX1798 CDMA Cellular/PCS System Power Supplies
Maxim
9 MAX1799 CDMA Cellular/PCS System Power Supplies
Maxim





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy