19-0782; Rev 1; 6/08
LED Light Management IC in
2.5mm x 2.5mm UCSP
General Description
The MAX8830 light management IC integrates a 400mA
(guaranteed) PWM DC-DC step-up converter, a 320mA
white LED camera flash current sink, and four program-
mable LED current sinks. The internal 1MHz step-up
converter features an internal switching MOSFET and
synchronous rectifier to improve efficiency and minimize
external component count. The camera flash output cur-
rent and maximum timer is programmable through I
2
C.
Each LED current is individually regulated to a program-
mable level (from off to 10mA in 32 steps) and is com-
pletely independent of each other.
An I
2
C interface controls individual on/off of all outputs,
step-up output voltage setting, movie/flash current,
flash timer duration settings, and individual LED current
sink settings.
The MAX8830 is available in a 16-bump UCSP™ pack-
age (2.5mm x 2.5mm).
Features
♦
Step-Up DC-DC Converter
400mA Guaranteed Output Current
Over 90% Efficiency
On-Chip FET and Synchronous Rectifier
Fixed 1MHz PWM Switching
Small 2.2µH to 10µH Inductor
I
2
C-Programmable V
OUT
(3.8V to 5.2V and Off in
16 Steps)
♦
Flash LED Current Sink
I
2
C-Programmable Flash Output Current (Off to
320mA in 32 Steps)
2
C-Programmable Flash Maximum Timer (0.5s,
I
1.0s, 1.5s, or 2.0s)
2
C-Programmable Movie Output Current (Off to
I
160mA in 16 Steps)
Movie Enabled by I
2
C or Logic Input
Flash Enabled by Logic Input
Low Dropout (75mV typ)
♦
Four LED Current Sinks
Individually I
2
C-Programmable Output Current
Off to 10mA in 32 Steps
Low LED Sink Current Dropout Voltage (30mV typ)
♦
I
2
C Interface
Write Address (0x94), Read Address (0x95)
Individual On/Off and LED Current Settings
Simple Register Mapping
♦
< 1µA Shutdown Current
♦
Open/Short LED Detection
♦
Thermal-Shutdown Protection
♦
16-Bump, 2.5mm x 2.5mm UCSP Package
MAX8830
Applications
Cell Phones and Smartphones
PDAs and MP3 Players
Typical Operating Circuit
2.2μH TO
10μH
PROGRAMMABLE
OUTPUT
3.8V TO 5.2V
UP TO 400mA*
OUT
C
OUT
INPUT
2.7V TO 5.5V
IN
C
IN
GND
PGND
LX
MAX8830
COMP
FLED
MOVIE ON
FLASH ON
MVON
FLEN
SCL
IC
SDA
V
LOGIC
LED3
V
DD
LED4
LED1
LED2
320mA FLASH
Ordering Information
PART
MAX8830EWE+T
TEMP
RANGE
-40°C to
+85°C
PIN-PACKAGE
16 UCSP (2.5mm x 2.5mm)
+Denotes
a lead-free package.
Pin Configuration appears at the end of data sheet.
*GUARANTEED OUTPUT CURRENT FOR EXTERNAL CIRCUITRY IS 400mA
MINUS THE SUM OF ALL LED CURRENTS.
UCSP is a trademark of Maxim Integrated Products, Inc.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
LED Light Management IC in
2.5mm x 2.5mm UCSP
MAX8830
ABSOLUTE MAXIMUM RATINGS
IN, OUT to GND………………………....…………..-0.3V to +6.0V
IN, OUT to GND (maximum of 1µs) ....................................+7.0V
V
DD
to GND ...........................................................-0.3V to +4.0V
SCL, SDA, MVON, FLEN to GND..................-0.3V to V
DD
+ 0.3V
COMP, FLED, LED_ to GND .......................-0.3V to V
OUT
+ 0.3V
PGND to GND .......................................................-0.3V to +0.3V
Continuous I
LX
Current......................................................1A
RMS
Continuous Power Dissipation (T
A
= +70°C)
16-Bump 2.5mm x 2.5mm UCSP
(derate 105.7mW/°C above +70°C) .............................750mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature* (soldering) ......................................+235°C
*This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be
exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recommended in the
industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection reflow. Preheating is required.
Hand or wave soldering is not allowed.
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
(V
IN
= 3.6V, V
GND
= V
PGND
= 0V, V
DD
= 3.0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
IN Operating Voltage
V
DD
Operating Range
V
DD
Undervoltage Lockout (UVLO) Threshold
V
DD
UVLO Hysteresis
IN UVLO Threshold
IN UVLO Hysteresis
V
DD
Standby Supply Current
IN Standby Supply Current
IN Shutdown Supply Current
Thermal-Shutdown Hysteresis
Thermal-Shutdown
LOGIC AND I
2
C INTERFACE
MVON, FLEN
Logic Input-High Voltage
V
DD
= 1.7V to 3.6V
SCL, SDA
MVON, FLEN
Logic Input-Low Voltage
V
DD
= 1.7V to 3.6V
SCL, SDA
T
A
= +25°C
T
A
= +85°C
-1
0.01
0.1
0.03
1.3
0.6
1.3
0.1
0.2
0.4
400
t
BUF
t
HD_STA
t
LOW
1.6
0.7 x
V
DD
0.4
0.3 x
V
DD
+1
V
V
SCL = SDA = V
DD
,
I
2
C ready
SCL = SDA = V
DD
,
I
2
C ready
All outputs off,
V
DD
= 0
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
V
IN
rising
2.25
V
DD
falling
DESCRIPTION
MIN
2.7
1.7
1.35
1.5
50
2.45
50
3
4
5
5
0.1
1
20
+160
5
15
10
2.65
TYP
MAX
5.5
3.6
1.65
UNITS
V
V
V
mV
V
mV
µA
µA
µA
°C
°C
Logic Input Current
SDA Output Low Voltage
I
2
C Clock Frequency
Bus-Free Time Between START and STOP
Hold Time Repeated START Condition
SCL Low Period
V
IL
= 0V or V
IH
= 3.6V
I
SDA
= 3mA
µA
V
kHz
µs
µs
µs
2
_______________________________________________________________________________________
LED Light Management IC in
2.5mm x 2.5mm UCSP
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.6V, V
GND
= V
PGND
= 0V, V
DD
= 3.0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SCL High Period
Setup Time Repeated START Condition
SDA Hold Time
SDA Setup Time
Setup Time for STOP Condition
STEP-UP DC-DC CONVERTER
IN Supply Current
OUT Voltage Range
OUT Voltage Accuracy
Line Regulation
Load Regulation
Maximum OUT Current
nFET Current Limit
LX nFET On-Resistance
LX pFET On-Resistance
LX Leakage
Operating Frequency
Maximum Duty Cycle
Minimum Duty Cycle
COMP Transconductance
COMP Discharge Resistance
OUT Discharge Resistance
FLED CURRENT SINK DRIVER
IN Supply Current
Maximum Current Setting
Step-up off, FLED on
Flash (enabled by FLEN)
Movie (enabled by MVON or I
2
C)
50mA setting, Movie
50mA setting (Note 2)
T
A
= +25°C
T
A
= +85°C
In 500ms steps (Note 3)
FLED enabled
FLED enabled
0.5
100
V
OUT
-
1V
T
A
= +25°C
T
A
= -40°C to +85°C
-3.0
-5
75
0.01
0.1
2.0
5
0.35
320
160
±0.5
+3.0
+5
0.6
mA
mA
V
COMP
= 1.5V
During shutdown or UVLO, from COMP to GND
During shutdown or UVLO, from OUT to IN
LX to PGND, I
LX
= 100mA
LX to OUT, I
LX
= 100mA
V
LX
= 5.5V
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= +85°C
0.75
65
1MHz switching, V
OUT
= 5V (see Note 4)
100mV steps
I
OUT
= 100mA
V
IN
= 2.7V to 4.2V
I
OUT
= 0 to 400mA
V
IN
≥
3.2V, V
OUT
= 5.0V
400
T
A
= +25°C
T
A
= +85°C
3.8
-1.5
-3
0.1
0.5
700
2.2
0.1
0.15
0.1
1
1.00
75
4
60
180
10
8
1.25
5
±0.3
5.5
10.0
5.2
+1.5
+3
mA
V
%
%/V
%/A
mA
A
Ω
Ω
µA
MHz
%
%
µS
Ω
kΩ
t
HIGH
t
SU_STA
t
HD_DAT
t
SU_DAT
t
SU_STO
DESCRIPTION
MIN
0.6
0.6
0
100
0.6
TYP
0.2
0.1
-0.01
50
0.1
MAX
UNITS
µs
µs
µs
ns
µs
MAX8830
Current Accuracy
Current-Regulator Dropout
FLED Leakage in Shutdown
Flash Duration Timer Range
Open-LED Detection Threshold
Shorted-LED Detection Threshold
%
mV
µA
s
mV
V
_______________________________________________________________________________________
3
LED Light Management IC in
2.5mm x 2.5mm UCSP
MAX8830
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.6V, V
GND
= V
PGND
= 0V, V
DD
= 3.0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
LED1–LED4 CURRENT SINK DRIVER
IN Supply Current
Maximum Current Setting
LED1–LED4 = 10mA
setting, V
OUT
= V
IN
3/32 setting, T
A
= +25°C
Current Regulator Dropout
Leakage in Shutdown
Open-LED Detection Threshold
Shorted-LED Detection Threshold
10mA setting (Note 2)
T
A
= +25°C
T
A
= +85°C
LED_ enabled
LED_ enabled
T
A
= +25°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
-2
-5
-8
±7
30
0.01
0.1
100
V
OUT
-
1V
125
5
mV
µA
mV
V
Step-up off, all current sinks on
0.2
10
±0.3
+2
+5
+8
%
0.5
mA
mA
DESCRIPTION
MIN
TYP
MAX
UNITS
Current Accuracy
Note 1:
All devices are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:
LED current sink dropout voltage is defined as the voltage at which current drops 10% from the current level measured at 0.6V.
Note 3:
Flash duration is from rising edge of FLEN until I
FLED
turns off (or returns to the movie current setting if MVON is high).
Note 4:
The MAX8830 step-up converter IN supply current is tested in an open-loop configuration with no inductor. Actual closed-
loop IN supply current is higher due to conduction losses in the inductor and LX nFET and pFET. These additional losses are
highly dependent on inductor value and series resistance.
4
_______________________________________________________________________________________
LED Light Management IC in
2.5mm x 2.5mm UCSP
Typical Operating Characteristics
(V
IN
= 3.6V, V
OUT
= 3.8V, V
DD
= 3.0V, circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
STEP-UP CONVERTER EFFICIENCY
vs. INPUT VOLTAGE
MAX8830 toc01
MAX8830
STEP-UP CONVERTER EFFICIENCY
vs. OUTPUT CURRENT
MAX8830 toc02
INPUT STANDBY SUPPLY CURRENT
vs. INPUT VOLTAGE
V
OUT
= V
IN
ALL LEDs OFF
I
2
C READY
MAX8830 toc03
100
98
96
EFFICIENCY (%)
V
OUT
= 3.8V
I
OUT
= 200mA
100
90
80
EFFICIENCY (%)
70
60
50
25
20
INPUT CURRENT (μA)
94
92
90
88
86
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
INPUT VOLTAGE (V)
L1 = 10μH
TOKO 1098AS-100M
DE2812C SERIES
V
OUT
= 5V
15
10
5
40
30
1
10
100
1000
OUTPUT CURRENT (mA)
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
INPUT VOLTAGE (V)
INPUT STANDBY SUPPLY
CURRENT vs. TEMPERATURE
V
OUT
= V
IN
ALL LEDs OFF
I
2
C READY
MAX8830 toc04
SWITCHING WAVEFORMS
(V
OUT
= 3.8V, I
OUT
= 280mA)
MAX8830 toc05
30
25
INPUT CURRENT (μA)
20
15
10
5
0
-40
-15
10
35
60
I
LX
200mA/div
V
LX
2V/div
85
400ns/div
TEMPERATURE (°C)
SWITCHING WAVEFORMS
(V
OUT
= 5V, I
OUT
= 280mA)
MAX8830 toc06
OSCILLATOR FREQUENCY
vs. TEMPERATURE
MAX8830 toc07
1.20
OSCILLATOR FREQUENCY (MHz)
1.15
1.10
1.05
1.00
0.95
0.90
I
LX
200mA/div
V
LX
2V/div
400ns/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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