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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1776 Datasheet

24V / 600mA Internal Switch / 100% Duty Cycle / Step-Down Converter

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MAX1776 pdf
19-1975; Rev 2; 7/03
24V, 600mA Internal Switch, 100% Duty Cycle,
Step-Down Converter
General Description
The MAX1776 high-efficiency step-down converter pro-
vides an adjustable output voltage from 1.25V to VIN from
supply voltages as high as 24V. An internal current-limit-
ed 0.4MOSFET delivers load currents up to 600mA.
Operation to 100% duty cycle minimizes dropout volt-
age (240mV at 600mA).
The MAX1776 has a low 15µA quiescent current to
improve light-load efficiency and conserve battery life.
The device draws only 3µA while in shutdown.
High switching frequencies (up to 200kHz) allow the
use of tiny surface-mount inductors and output capaci-
tors. The MAX1776 is available in an 8-pin µMAX pack-
age, which uses half the space of an 8-pin SO. For
increased output drive capability, use the MAX1626/
MAX1627 step-down controllers, which drive an exter-
nal P-channel MOSFET to deliver up to 20W.
Features
o Fixed 5V or Adjustable Output
o 4.5V to 24V Input Voltage Range
o Up to 600mA Output Current
o Internal 0.4P-Channel MOSFET
o Efficiency Over 95%
o 15µA Quiescent Supply Current
o 3µA Shutdown Current
o 100% Maximum Duty Cycle for Low Dropout
o Current-Limited Architecture
o Thermal Shutdown
o Small 8-µMAX Package
Applications
Notebook Computers
Distributed Power Systems
Keep-Alive Supplies
Hand-Held Devices
PART
MAX1776EUA
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 µMAX
Typical Operating Circuit
SHDN
IN VIN
ILIM LX
MAX1776
ILIM2
OUT
FB GND
µMAX
VOUT
TOP VIEW
Pin Configuration
FB 1
GND 2
ILIM 3
LX 4
MAX1776EUA
8 OUT
7 SHDN
6 ILIM2
5 IN
µMAX
________________________________________________________________ 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

MAX1776 Datasheet

24V / 600mA Internal Switch / 100% Duty Cycle / Step-Down Converter

No Preview Available !

MAX1776 pdf
24V, 600mA Internal Switch, 100% Duty Cycle,
Step-Down Converter
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, ILIM, ILIM2 to GND .................................-0.3V to 25V
LX to GND.......................................................-2V to (VIN + 0.3V)
OUT, FB to GND .........................................................-0.3V to 6V
Peak Input Current .................................................................. 2A
Maximum DC Input Current.............................................. 500mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
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
(Circuit of Figure 1, VIN = +12V, SHDN = IN, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Input Voltage Range
Input Supply Current
Input Supply Current in Dropout
Input Shutdown Current
VIN
IIN
IIN(DROP)
No load
No load
SHDN = GND
Input Undervoltage Lockout
Threshold
Output Voltage (Preset Mode)
Feedback Set Voltage
(Adjustable Mode)
VUVLO
VOUT
VFB
VIN rising
VIN falling
FB = GND
OUT Bias Current
OUT Pin Maximum Voltage
VOUT = 5.5V
FB Bias Current
FB Dual ModeThreshold Low
IFB VFB = 1.3V
LX Switch Minimum Off-Time
LX Switch Maximum On-Time
tOFF(MIN)
tON(MAX) VFB = 1.3V
ILIM = ILIM2 = GND
VIN = 6V
ILIM = GND, ILIM2 = IN
ILIM = IN, ILIM2 = GND
LX Switch On-Resistance
RLX
ILIM = ILIM2 = IN
ILIM = ILIM2 = GND
VIN = 4.5V
ILIM = GND, ILIM2 = IN
ILIM = IN, ILIM2 = GND
ILIM = ILIM2 = IN
ILIM = ILIM2 = GND
LX Current Limit
ILIM = GND, ILIM2 = IN
ILX(PEAK) ILIM = IN, ILIM2 = GND
ILIM = ILIM2 = IN
LX Zero-Crossing Threshold
Zero-Crossing Timeout
LX does not rise above the threshold
LX Switch Leakage Current
VIN = 24V,
LX = GND
Dual Mode is a trademark of Maxim Integrated Products, Inc.
TA = +25°C
TA = 0°C to +85°C
MIN
4.5
3.6
3.5
4.80
1.212
1.65
-25
50
0.22
8
120
240
480
960
-75
TYP
15
50
3
4.0
3.9
5.00
1.25
3.5
100
0.42
10
1.6
0.8
0.4
0.4
1.9
1.0
0.5
0.5
150
300
600
1200
30
MAX
24
28
70
7
4.4
4.3
5.20
UNITS
V
µA
µA
µA
V
V
1.288
V
6.25
5.5
+25
150
0.62
12
3.2
1.6
0.8
0.8
3.8
1.9
0.95
0.95
180
360
720
1440
+75
1
10
µA
V
nA
mV
µs
µs
mA
mV
µs
µA
2 _______________________________________________________________________________________


Part Number MAX1776
Description 24V / 600mA Internal Switch / 100% Duty Cycle / Step-Down Converter
Maker Maxim
Total Page 13 Pages
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MAX1776 pdf
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