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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1896 Datasheet

1.4MHz SOT23 Current-Mode Step-Up DC-DC Converter

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MAX1896 pdf
19-2221; Rev 1; 3/04
1.4MHz SOT23 Current-Mode
Step-Up DC-DC Converter
General Description
The MAX1896 step-up DC-DC converter incorporates
high-performance current-mode, fixed-frequency,
pulse-width modulation (PWM) circuitry and an internal
0.7N-channel MOSFET to provide a highly efficient
regulator with fast response.
High switching frequency (1.4MHz) allows fast loop
response and easy filtering with small components. The
MAX1896 can produce an output voltage as high as
13V from an input as low as 2.6V. Soft-start is program-
mable with an external capacitor, which sets the input
current ramp rate. In shutdown mode, current con-
sumption is reduced to 0.01µA.
The MAX1896 is available in a space-saving 6-pin
SOT23 package. The ultra-small package and high
switching frequency allow cost and space-efficient
implementations.
Features
>90% Efficiency
Adjustable Output Up to 13V
Guaranteed 12V/120mA Output from 5V Input
2.6V to 5.5V Input Range
LT1613 Pin Compatible
0.01µA Shutdown Current
Programmable Soft-Start
Space-Saving 6-Pin SOT23 Package
Notebook Computers
LCD Displays
PCMCIA Cards
Portable Applications
Hand-Held Devices
Applications
PART
MAX1896EUT-T
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
Typical Operating Circuit
INPUT
2.6V TO 5.5V
ON
OFF
IN LX
MAX1896
SHDN
SS
FB
GND
R1
R2
OUTPUT
UP TO 13V
UP TO 600mA
Pin Configuration
TOP VIEW
LX 1
6 IN
MAX1896
GND 2
5 SS
FB 3
4 SHDN
SOT23
________________________________________________________________ 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

MAX1896 Datasheet

1.4MHz SOT23 Current-Mode Step-Up DC-DC Converter

No Preview Available !

MAX1896 pdf
1.4MHz SOT23 Current-Mode
Step-Up DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
LX to GND ..............................................................-0.3V to +14V
IN, SHDN, FB to GND...............................................-0.3V to +6V
SS to GND ...................................................-0.3V to (VIN + 0.3V)
RMS LX Pin Current ..............................................................0.6A
Continuous Power Dissipation (TA = +70°C) (Note 1)
6-Pin SOT23 (derate 9.1mW/°C above +70°C)...........727mW
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
Note 1: Thermal properties are specified with product mounted on PC board with one square-inch of copper area and still air.
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
(VIN = VSHDN = 3V, FB = GND, SS = open, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
Input Supply Range
Output Voltage Adjust Range
VIN Undervoltage Lockout
Quiescent Current
Shutdown Supply Current
ERROR AMPLIFIER
Feedback Regulation Set Point
FB Input Bias Current
Line Regulation
OSCILLATOR
Frequency
Maximum Duty Cycle
POWER SWITCH
Current Limit (Note 2)
On-Resistance
Leakage Current
SOFT-START
Reset Switch Resistance
Charge Current
CONTROL INPUT
Input Low Voltage
Input High Voltage
SHDN Input Current
SYMBOL
VIN
VOUT
UVLO
IIN
CONDITIONS
Circuit of Figure 1
VIN rising, 50mV hysteresis
VFB = 1.3V, not switching
VFB = 1.0V, switching
V SHDN = 0, TA = +25°C
V SHDN = 0
VFB
IFB VFB = 1.24V
2.6V < VIN < 5.5V
fOSC
DC
ILIM
RON
ILXOFF
VFB = 1V, duty cycle = 50%
VLX = 12V, TA = +25°C
VLX = 12V
VSS = 1.2V
VIL
VIH
ISHDN
V SHDN, VIN = 2.6V to 5.5V
V SHDN, VIN = 2.6V to 5.5V
V SHDN = 3V
V SHDN = 0
MIN
2.6
2.25
TYP
2.4
0.2
1
0.01
0.01
MAX
5.5
13
2.55
0.4
5
0.5
10
UNITS
V
V
V
mA
µA
1.2 1.24 1.25
V
21 80 nA
0.05 0.20 %/V
1000
82
1400
86
1800
kHz
%
0.55 0.8
A
0.7 1
0.1 1
µA
10
100
1.5 4 7.0 µA
0.3
1.0
25 50
0.01 0.1
V
V
µA
2 _______________________________________________________________________________________


Part Number MAX1896
Description 1.4MHz SOT23 Current-Mode Step-Up DC-DC Converter
Maker Maxim
Total Page 10 Pages
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