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ADP5501
THEORY OF OPERATION
2.7V TO 5.5V
1μF
1μF
4.7μH
2
SW
22
BST
BL_SNK
23
I-LIMIT OVP
27V
THERMAL
PROTECTION
PGND
VBAT
1
21
BOOST
CONTROL
IN
FB
0.65V
BACKLIGHT
CURRENT
CONTROL
LDO
VDDIO 16
CAP_OUT
20
1μF
POR
EN
OUT
2.7V
BIAS/CLOCK
STATE MACHINE
REGISTER MAP
LIGHT
SENSOR
17
CMP_IN
VBAT
100nF
SCL 5
SDA 4
INT 3
RST 15
INTERFACE
INTERRUPT/RESET
CONTROL
ADP5501
LED
CURRENT
CONTROL
GND GND GND
18
19
24
6
7
8
9
10
11
13
12
14
NC NC NC NC NC NC
LED2 LED1 LED0
Figure 13. Internal Block Diagram
The ADP5501 is an autonomous backlight white LED driver
with programmable current and ambient light sensor input. It is
ideal for cellular phone designs and other portable devices,
where programmable and automated light output is needed. Its
versatility makes it ideal for media-enabled mobile devices.
Programmable fade-in, fade-out, dim, and off timers provide
the backlight with excellent flexibility and control features.
Using an external photodiode, the ADP5501 can perform
ambient light sensing and adjust the backlight brightness
according to varying lighting conditions.
To achieve this high voltage, the ADP5501 contains a nonsyn-
chronous boost device capable of driving an LED string with an
OVP limited to 24.5 V(minimum). For detailed information
about the boost device, see the Applications Information
section. With sufficient forward voltage created, the ADP5501
controls the current (and thus the brightness) of the LED string
via an adjustable internal current sink. An internal state
machine, in conjunction with programmable timers, dynamically
adjusts the current sink between 0 mA and 30 mA to achieve
impressive backlight control features.
Programmable fading is also available for the three LED sinks.
Once programmed through its I 2 C-compatible interface, the
ADP5501 can run autonomously. An interrupt line (INT) is
available to alert an external microprocessor of the status of its
ambient light sensor comparator states, current limit, thermal
DAYLIGHT_MAX
DAYLIGHT_DIM
BST
BL_VALUE
BL_SNK
overload, and overvoltage conditions.
BACKLIGHT DRIVE CONTROL
White LEDs are common in backlighting the displays of
modern portable devices such as cell phones. White LEDs
require a high forward voltage, V F (typically, 3.5 V), before they
OFFICE_MAX
OFFICE_DIM
DARK_MAX
DARK_DIM
BL_LVL
MUX
BL_OFFT
BL_DIMT
BL_FI
COUNTERS
AND
CONTROL
LOGIC
BL_EN
DIM_EN
BL_LAW
conduct current and emit light. Display panels, depending on
their size, can be backlit with single or multiple white LEDs. In
panels that require multiple LEDs, the LEDs are commonly
connected in a series string to achieve uniform brightness in
each LED by passing a common current through all of them.
The LED string, however, needs to be biased with a voltage
greater than the sum of each LED V F before it can conduct.
Rev. 0 | Page 9 of 28
BL_FO
Figure 14. Backlight Brightness Control
CLOCK
GENERATOR
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