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PDF MAX1896 Data sheet ( Hoja de datos )
| Número de pieza | MAX1896 | |
| Descripción | 1.4MHz SOT23 Current-Mode Step-Up DC-DC Converter | |
| Fabricantes | Maxim Integrated | |
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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
0.7Ω N-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.
1 page  
1.4MHz SOT23 Current-Mode
Step-Up DC-DC Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 3.3V, TA = +25°C, unless otherwise noted.)
STARTUP WAVEFORM
WITH SOFT-START
IOUT = 100mA
SHDN
5V/div
OUTPUT
VOLTAGE
5V/div
INDUCTOR
CURRENT
500mA/div
2ms/div
VIN = 3.3V, CSS = 33nF,
COUT = 3.3µF TANTALUM + 0.1µF CERAMIC
CIRCUIT OF FIGURE 3
SWITCHING WAVEFORM
LX VOLTAGE
5V/div
OUTPUT
VOLTAGE
AC-COUPLED
200mV/div
INDUCTOR
CURRENT
500mA/div
IOUT = 150mA
400ns/div
VIN = 5V,
COUT = 0.1µF CERAMIC + 2.2µF CERAMIC
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
600
500
400
300 VOUT = 5V
VOUT = 12V
200
MAXIMUM OUTPUT
100 CURRENT DEFINED AT
90% OF NO LOAD
OUTPUT VOLTAGE
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Pin Description
PIN NAME
FUNCTION
1
LX
Power Switching Connection. Connect LX to the inductor and output rectifier. Connect components
as close to LX as possible.
2
GND
Ground
3
FB
Feedback Input. Connect a resistive voltage-divider from the output to FB to set the output voltage.
See the Setting the Output Voltage section.
Shutdown Input. Drive SHDN low to turn off the converter. To automatically start the converter,
4
SHDN
connect SHDN to IN. Drive SHDN with a slew rate of 0.1V/µs or greater. Do not leave SHDN
unconnected. SHDN draws up to 50µA.
5 SS Soft-Start Input. Connect a soft-start capacitor from SS to GND to soft-start the converter. Leave SS
open to disable the soft-start function. See the Soft-Start section.
6 IN Internal Bias Voltage Input. Connect IN to the input voltage source. Bypass IN to GND with a
1µF or greater capacitor as close to IN as possible.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX1896.PDF ] | |
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