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MAX1848 Fiches technique(PDF) 5 Page - Maxim Integrated Products

No de pièce MAX1848
Description  White LED Step-Up Converter in SOT23
Download  9 Pages
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1848 Fiches technique(HTML) 5 Page - Maxim Integrated Products

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White LED Step-Up Converter in SOT23
_______________________________________________________________________________________
5
20ms/div
VCTRL TRANSIENT RESPONSE
VCTRL
VOUT
ILED
1.0V
2.0V
6.7V
6.3V
MAX1848 toc10
30mA
15mA
CCOMP = 1
µF
Typical Operating Characteristics (continued)
(See Typical Application Circuit, V+ = 3V, ILED = 15mA, L = 33µH, COUT = 1µF, CCOMP = 0.15µF, RSENSE = 5
Ω, CTRL = 1V, 2 LEDs,
TA = +25
°C, unless otherwise noted.)
200ns/div
SWITCHING WAVEFORMS
VLX
IL
VIN_RIPPLE
0
6.5V
61mA
17mA
MAX1848 toc11
VOUT_RIPPLE
10mV/div
10mV/div
Pin Description
PIN
NAME
FUNCTION
1
COMP
Compensation Pin for Error Amplifier. Connect capacitor from COMP to GND. Startup time is set
by the capacitance connected to this pin (0.833ms for each 0.01µF). VCOMP passively
discharges to GND when in shutdown.
2
CTRL
Brightness/Shutdown Dual Mode Control Input. LED brightness and IC shutdown are controlled
by the voltage on CTRL. Voltages between 250mV and 5.5V or (V+ + 2V), whichever is less,
adjust the brightness from dim to bright, respectively. To put the IC into shutdown, drive below
100mV or connect to GND.
3
OUT
Overvoltage Sense. When VOUT is greater than 13.25V, the internal N-channel MOSFET is turned
off and VCOMP decays to GND. When VOUT drops below 12.25V, the IC will re-enter soft-start.
Connect a 1µF capacitor from OUT to GND.
4
LX
Inductor Connection. Drain of the internal high-voltage N-channel MOSFET.
5
PGND
Power Ground. Source of the internal high-voltage N-channel MOSFET.
6
GND
Ground
7CS
Current-Sense Feedback Input. Connect a resistor from this pin to GND to set the LED bias
current. This pin regulates to 7.5% of VCTRL.
8V+
Supply Voltage Input. The IC is powered from this pin. Input range is 2.6V to 5.5V. Bypass with a
ceramic capacitor to GND.


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Numéro de composants électroniques

No de pièceDescriptionHtml ViewFabricant
AIC1647 WHITE LED STEP-UP CONVERTER IN SOT23 1  2  3  4  5  More Analog Intergrations Corporation
APW7071 White LED DC/DC Step-Up Converter 1  2  3  4  5  More Anpec Electronics Coropration
LM3557 Step-Up Converter for White LED Applications 1  2  3  4  5  More National Semiconductor (TI)
AP1521 White LED Step-Up Converter 1  2  3  4  5  More Anachip Corp
MAX1582 High-Efficiency 26V Step-Up Converter for White LED Main and Subdisplay Backlighting 1  2  3  4  5  More Maxim Integrated Products
LT3466 Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes 1  2  3  4  5  More Linear Technology
LM3557 Step-Up Converter for White LED Applications 1  2  3  4  5  More National Semiconductor (TI)
A8431 White LED Driver Constant Current Step-up Converter 1  2  3  4  5  More Allegro MicroSystems
AIC1648 Built-in OVP White LED Step-Up Converter 1  2  3  4  5  More Analog Intergrations Corporation
G5121 Fixed Frequency White LED Step-Up Converter 1  2  3  4  5  More Global Mixed-mode Technology Inc

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