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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1760 Datasheet

0.8A / Low-Noise / 1MHz / Step-Up DC-DC Converter

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MAX1760 pdf
19-1660; Rev 1; 1/01
EVAALVUAAILTAIOBNLEKIT
0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
General Description
The MAX1760 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It maintains exceptionally low qui-
escent supply current (100µA) despite its high 1MHz
operating frequency. Small external components and a
tiny 10-pin µMAX package make this device an excel-
lent choice for small hand-held applications requiring
the longest possible battery life.
The MAX1760 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 1 to 3 alkaline or NiCd/NiMH cells or a
single lithium-ion (Li+) cell. Maxim's proprietary Idle-
Mode™ circuitry significantly improves efficiency at
light load currents while smoothly transitioning to fixed-
frequency PWM operation at higher load currents to
maintain excellent full-load efficiency.
Low-noise, forced PWM mode is available for applica-
tions requiring constant-frequency operation at all load
currents. The MAX1760 may also be synchronized to
an external clock to protect sensitive frequency bands
in communications equipment. Analog soft-start and
adjustable current limit permit optimization of efficiency,
external component size, and output voltage ripple.
Digital Cordless Phones
Wireless Handsets
Palmtop Computers
Two-Way Pagers
Applications
PCS Phones
Hand-Held Instruments
Personal Communicators
Features
o Up to 94% Efficiency
o 0.7V to 5.5V Input Range
o Up to 800mA Output
o Fixed 3.3V Output (or adj from 2.5V to 5.5V)
o PWM Synchronous Rectified Topology
o Low-Noise, Constant Frequency Operation (1MHz)
o 0.1µA Logic-Controlled Shutdown
o Synchronizable Switching Frequency
o Adjustable Current Limit
o Adjustable Soft-Start
o 10-Pin µMAX Package
PART
MAX1760EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
INPUT = 0.7V
TO VOUT
Typical Operating Circuit
TOP VIEW
Pin Configuration
MAX1760
ON
CLK/SEL
LX
POUT
ISET
REF
OUT
FB GND PGND
VOUT = 3.3V,
800mA
ISET 1
REF 2
GND 3
FB 4
OUT 5
MAX1760
µMAX
10 ON
9 POUT
8 LX
7 PGND
6 CLK/SEL
Idle Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1760 Datasheet

0.8A / Low-Noise / 1MHz / Step-Up DC-DC Converter

No Preview Available !

MAX1760 pdf
0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
ON, OUT, CLK/SEL to GND .....................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
LX to PGND ............................................-0.3V to (VPOUT + 0.3V)
POUT to OUT ......................................................................±0.3V
REF, FB, ISET, POUT to GND...................-0.3V to (VOUT + 0.3V)
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
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
(CLK/SEL = ON = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = 0°C to +85°C. Typical values are at TA =
+25°C, unless otherwise noted.)
PARAMETER
DC-DC CONVERTER
Input Voltage Range (Note 1)
Minimum Startup Voltage (Note 2)
Temperature Coefficient of Startup Voltage
Frequency in Startup Mode
Internal Oscillator Frequency
Oscillator Maximum Duty Cycle (Note 3)
External Clock Frequency Range
CONDITIONS
ILOAD < 1mA, TA = +25°C
ILOAD < 1mA
VOUT = 1.5V
CLK/SEL = OUT
MIN TYP MAX UNITS
0.7 5.5
V
0.9 1.1
V
-2.3 mV/°C
125 500 1000 kHz
0.8 1 1.2 MHz
80 86 90 %
0.5 1.2 MHz
Output Voltage
FB Regulation Voltage
FB Input Leakage Current
Load Regulation
Output Voltage Adjust Range
Output Voltage Lockout Threshold (Note 4)
ISET Input Leakage Current
Supply Current in Shutdown
No-Load Supply Current (Note 5)
No-Load Supply Current Forced PWM Mode
DC-DC SWITCHES
POUT Leakage Current
LX Leakage Current
Switch On-Resistance
N-Channel Current Limit
P-Channel Turn-Off Current
VFB < 0.1V, CLK/SEL = OUT, includes load
regulation for 0 < ILX < 0.55A
Adjustable output, CLK/SEL = OUT, includes
load regulation for 0 < ILX < 0.55A
VFB = 1.35V
CLK/SEL = OUT, no load to full load
(0 < ILX < 1.0A)
Rising edge
VISET = 1.25V
V ON = 3.6V
CLK/SEL = GND
CLK/SEL = OUT
VLX = 0, VOUT = 5.5V
VLX = V ON = VOUT = 5.5V
N-channel
P-channel
CLK/SEL = GND
3.17 3.3 3.38
1.215 1.240 1.270
0.01 100
-1.5
2.5
2.00
2.15
±0.01
0.1
100
2.5
5.5
2.30
±50
5
185
0.1 10
0.1 10
0.15 0.28
0.25 0.45
1.0 1.25 1.6
20 60 120
V
V
nA
%
V
V
nA
µA
µA
mA
µA
µA
A
mA
2 _______________________________________________________________________________________


Part Number MAX1760
Description 0.8A / Low-Noise / 1MHz / Step-Up DC-DC Converter
Maker Maxim
Total Page 12 Pages
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