900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1765 Datasheet

800mA / Low-Noise / Step-Up DC-DC Converter with 500mA Linear Regulator

No Preview Available !

19-1805; Rev 0; 12/00
800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
General Description
The MAX1765 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. This device operates at a high
1MHz fixed frequency while maintaining an exception-
ally low quiescent supply current (200µA). Its small
external components and tiny package make this
device an excellent choice for small hand-held applica-
tions that require the longest possible battery life.
The MAX1765 uses a synchronous-rectified pulse-
width-modulation (PWM) boost topology to generate
2.5V to 5.5V outputs from a wide range of input
sources, such as one to three alkaline or NiCd/NiMH
cells or a single lithium-ion (Li+) cell. Maxim's propri-
etary architecture significantly improves efficiency at
low load currents while automatically transitioning to
fixed-frequency PWM operation at medium to high load
currents to maintain excellent full-load efficiency.
Forced-PWM mode is available for applications that
require constant-frequency operation at all load cur-
rents, and the MAX1765 may also be synchronized to
an external clock to protect sensitive frequency bands
in communications equipment.
The MAX1765’s low-dropout (LDO) linear regulator and
DC-DC converter have separate shutdown control. The
linear regulator's 250mpass device maintains excel-
lent dropout voltage at currents up to 500mA. The
MAX1765 also features analog soft-start and current-
limit functions to permit optimization of efficiency, exter-
nal component size, and output voltage ripple.
The MAX1765 comes in a 16-pin QSOP package and a
thermally enhanced 16-pin TSSOP-EP.
Typical Operating Circuit
ONL ONA
(0.7V TO 5.5V) 3.3µH
POUT
LX INL
ONB
CLK/SEL
TRACK
OUT
FB
OUT = 3.3V
MAX1765
REF
ILIM
OUTL
GND FBL PGND
OUTL = 2.85V
(ADJ 1.25V
TO 5V)
____________________________Features
o High-Efficiency Step-Up Converter
Up to 93% Efficiency
Adjustable Output from +2.5V to +5.5V
Up to 800mA Output
PWM Synchronous-Rectified Topology
1MHz Operating Frequency (or Sync)
o LDO Linear Regulator
500mA LDO Linear Regulator
2.85V Linear Regulator Output or Adjustable
(1.25V to 5V)
Low 125mV Dropout at 500mA
o +0.7V to +5.5V Input Range
o 0.1µA Logic-Controlled Shutdown
o Adjustable Inductor Current Limit and Soft-Start
o Thermal Shutdown
o 1.5W, 16-Pin TSSOP-EP Package Available
PART
MAX1765EEE
MAX1765EUE
*Exposed pad
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 TSSOP-EP*
Wireless Handsets
PCS Phones
Palmtop Computers
Applications
Personal
Communicators
Hand-Held Instruments
Portable Audio Players
TOP VIEW
Pin Configuration
FBL 1
ISET 2
REF 3
GND 4
FB 5
OUT 6
ONA 7
CLK/SEL 8
MAX1765
16 ONL
15 TRACK
14 OUTL
13 INL
12 POUT
11 LX
10 PGND
9 ONB
QSOP/TSSOP-EP
________________________________________________________________ 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

MAX1765 Datasheet

800mA / Low-Noise / Step-Up DC-DC Converter with 500mA Linear Regulator

No Preview Available !

800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
ABSOLUTE MAXIMUM RATINGS
ONA, ONB, ONL, TRACK, OUT, INL to GND..............-0.3V, +6V
PGND to GND.....................................................................±0.3V
LX to GND ...............................................-0.3V to (POUT + 0.3V)
OUTL to GND ..............................................-0.3V to (INL + 0.3V)
CLK/SEL, REF, FB, FBL, ISET, POUT
to GND...................................................-0.3V to (OUT + 0.3V)
OUTL Short Circuit .....................................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
16-Pin TSSOP-EP (derate 19mW/°C above +70°C) ....1500mW
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
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
(VOUT = VPOUT = VINL = VONA = VONL = 3.6V, CLK/SEL = FBL = ONB = TRACK = PGND = GND, ISET = REF (bypassed with
0.22µF), LX = open, OUTL = open (bypassed with 4.7µF), TA = 0°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
DC-DC CONVERTER
Input Voltage Range
INL Voltage Range
Minimum Startup Voltage
Temperature Coefficient of
Startup Voltage
FB Regulation Voltage
FB Input Leakage Current
Output Voltage Adjust Range
Load Regulation
OUT Voltage in Track Mode
Frequency in Startup Mode
Startup to Normal Mode
Transition Voltage
ISET Input Leakage Current
Supply Current in Normal Mode
(Note 3)
SYMBOL
CONDITIONS
(Note 1)
(Note 1)
ILOAD < 1mA, TA = +25°C, Figure 2
ILOAD < 1mA
VFB CLK/SEL = OUT, 0 < ILX < 0.55A
VFB = 1.35V
CLK/SEL = OUT, 0 < ILOAD < 800mA
VOUTL > 2.0V, INL = POUT
fLX VOUT = 1.5V
Rising edge only (Note 2)
VISET = 1.25V
CLK/SEL = ONL = GND, no load
MIN TYP MAX UNITS
0.7 5.5
2.3 5.5
0.9 1.1
V
V
V
-2 mV/°C
1.215
2.5
VOUTL
+ 0.4
125
1.250
0.01
-1
VOUTL
+ 0.5
1.275
100
5.5
VOUTL
+ 0.6
1000
V
nA
V
%
V
kHz
2.00 2.15 2.30
V
0.01 50
nA
100 200
µA
Supply Current in Low-Noise
PWM Mode (Note 3)
Supply Current in Shutdown
CLK/SEL = OUT,
no load
VFB = 1.5V
FB = GND (LX switching)
ONA = ONL = GND, ONB = OUT
130 200
2.5
1 10
µA
mA
µA
2 _______________________________________________________________________________________


Part Number MAX1765
Description 800mA / Low-Noise / Step-Up DC-DC Converter with 500mA Linear Regulator
Maker Maxim
Total Page 19 Pages
PDF Download

MAX1765 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 MAX176 Serial-Output / 250Ksps 12-Bit ADC with T/H and Refernce
Maxim
2 MAX1760 0.8A / Low-Noise / 1MHz / Step-Up DC-DC Converter
Maxim
3 MAX17601 (MAX17601 - MAX17605) Dual MOSFET Drivers
Maxim Integrated Products
4 MAX17602 (MAX17601 - MAX17605) Dual MOSFET Drivers
Maxim Integrated Products
5 MAX17603 (MAX17601 - MAX17605) Dual MOSFET Drivers
Maxim Integrated Products
6 MAX17604 (MAX17601 - MAX17605) Dual MOSFET Drivers
Maxim Integrated Products
7 MAX17605 (MAX17601 - MAX17605) Dual MOSFET Drivers
Maxim Integrated Products
8 MAX1761 Small / Dual / High-Efficiency Buck Controller for Notebooks
Maxim
9 MAX1762 High-Efficiency / 10-Pin MAX / Step-Down Controllers for Notebooks
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