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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8831 Datasheet

High Efficiency White LED Step-Up Converter

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MAX8831
EVALUATION KIT AVAILABLE
High-Efficiency, White LED
Step-Up Converter with I2C
Interface in 2mm x 2mm WLP
General Description
The MAX8831 integrates a 60mA, 28V PWM DC-DC
step-up converter with five low-dropout LED current
regulators for display and keypad backlighting in cell
phones, PDAs, and other portable devices. The IC pro-
vides up to 90% efficiency over the entire input voltage
range of 2.7V to 5.5V. The step-up converter operates
at a fixed 2MHz switching frequency, enabling the use
of very small external components to achieve a com-
pact circuit area. For improved efficiency, the step-up
converter automatically transitions to pulse-skipping
mode at light loads.
Each of the five current regulators accommodates up to
9 series LEDs (depending on LED string forward volt-
age), and is independently programmed using an I2C
interface. Two of the current regulators (LED1, LED2)
are intended to support display backlight functions and
are programmable up to 25mA using a 128-step loga-
rithmic dimming scheme. The other three regulators
(LED3, LED4, LED5) are suitable for keyboard backlight
functions or for driving signal indicators, and are pro-
grammable up to 5mA using a 32-step logarithmic dim-
ming scheme. The low-current regulators (LED3, LED4,
LED5) can be operated from the step-up converter or
from a separate low-voltage source.
The I2C interface controls all operational aspects of the
current regulators, including: on/off state, LED current,
ramp-up/ramp-down timers, and blink rate timers
(LED3, LED4, LED5). The MAX8831 write/read address-
es are factory programmed at 0x9A/0x9B (contact the
factory for other address options).
The MAX8831 features open/short LED fault detection,
output overvoltage protection, thermal shutdown, and
open-circuit Schottky diode detection, with the status of
each fault monitored continually for readback through
the I2C interface.
The MAX8831 is available in a tiny 2mm x 2mm, 16-bump
WLP package.
Applications
Cell Phones
PDAs
Smartphones
Benefits and Features
Highly Integrated 28V Step-Up DC-DC Converter with
Programmable Functionality Lowers System Cost
Integrated NMOS Power Switch
Two 25mA Regulators for Display Backlighting
I2C-Programmable 50µA to 25.25mA Output Current
128-Step Logarithmic Dimming
Individually Programmable Ramp (Up/Down) Timers
Low Dropout (200mV max)
Three 5mA Current Regulators for Keypad Lighting
with I2C-Programmable 50µA to 5.0mA Output Current
32-Step Logarithmic Dimming
Individually Programmable Ramp (Up/Down) Timers
Individual Blink Rate and Duty Cycle Timers
Low Dropout (150mV max)
I2C Programmable Compatible with 1.8V Logic
Protection Features Increase Reliability
Open/Short LED and Open-Circuit Diode Detection
Thermal-Shutdown and Output Overvoltage
Protection
High Efficiency and Low Shutdown Current Extend
Battery Life
> 90% Efficiency
Pulse Skipping for Improved Light-Load Efficiency
Ultra-Low 0.1µA Shutdown Current
Small Solution Size Saves Board Space
Tiny 2mm x 2mm, 16-Bump WLP Package
2MHz Switching Frequency Allows Use of Tiny
External Components
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX8831EWE+T -40°C to +85°C
16 WLP
2mm x 2mm
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
19-4370; Rev 2; 5/15


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8831 Datasheet

High Efficiency White LED Step-Up Converter

No Preview Available !

MAX8831
High-Efficiency, White LED
Step-Up Converter with I2C
Interface in 2mm x 2mm WLP
Absolute Maximum Ratings
IN to GND ..............................................................-0.3V to +6.0V
VDD, COMP to GND.....................................-0.3V to (VIN + 0.3V)
SDA, SCL to GND.......................................-0.3V to (VDD + 0.3V)
OUT, LX, LED1–LED5 to GND................................-0.3V to +30V
ILX (Note 1) .....................................................................1.2ARMS
PGND to GND .......................................................-0.3V to +0.3V
Operating Temperature Range ...........................-40°C to +85°C
Continuous Power Dissipation (TA = +70°C)
16-Bump, 2mm x 2mm WLP
(derate 8.2mW/°C above +70°C ambient) ...................660mW
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering, reflow) ............................+260°C
Note 1: LX has an internal clamp diode to PGND. Applications that forward bias this diode should take care not to exceed the power
dissipation limits of the device.
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 = 3.6V, VGND = VPGND = 0V, VDD = 1.8V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
IN Supply Voltage
VDD Supply Voltage
IN Undervoltage Lockout
Threshold
IN Quiescent Current
No load, 2MHz switching
IN Shutdown Current
VDD Standby Current
IN Standby Current
OUT Leakage Current
LED_ CURRENT REGULATORS
VDD = GND
VSDA = VSCL = VDD
VSDA = VSCL = VDD
VIN = VOUT = 5.5V, VDD = GND
TA = +25°C
TA = +85°C
TA = +25°C
TA = +85°C
TA = +25°C
TA = +85°C
TA = +25°C
TA = +85°C
LED_ Current Regulator Dropout
Voltage (Note 2)
LED_ Current Accuracy
LED_ Leakage Current
LED_ Regulation Voltage
N-CHANNEL SWITCH
LX Current Limit
ILED1 or ILED2 = 25mA setting
ILED3 or ILED4 or ILED5 = 5.0mA setting
ILED1 or ILED2 = 25.25mA
setting
TA = +25°C
TA = -40°C to +85°C
ILED3 or ILED4 or ILED5 = 5.0mA TA = +25°C
setting
TA = -40°C to +85°C
VLED_ = 5.5V, VDD = GND
TA = +25°C
TA = +85°C
LX On-Resistance
ILX = 200mA
MIN TYP MAX UNITS
2.7 5.5 V
1.6 5.5 V
2.4 2.6 V
1.5
0.1 1
0.1
0.1 1
0.1
25
2
0.01 1
0.1
mA
µA
µA
µA
µA
200
150
-2 +2
-5 +5
-2 +2
-5 +5
0.01 1
0.1
0.35
780 860
0.3
mV
mV
%
%
µA
V
mA
Ω
www.maximintegrated.com
Maxim Integrated | 2


Part Number MAX8831
Description High Efficiency White LED Step-Up Converter
Maker Maxim Integrated Products
PDF Download

MAX8831 Datasheet PDF






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