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PDF NCP5604B Data sheet ( Hoja de datos )

Número de pieza NCP5604B
Descripción High Efficiency White LED Driver
Fabricantes ON Semiconductor 
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NCP5604A, NCP5604B
High Efficiency White LED
Driver
The NCP5604A and NCP5604B products are multiple output LED
drivers dedicated to the display back light. The NCP5604A drives up
to 4 LEDs, the NCP5604B version being dedicated to the three LED
applications.
The two parts share a common built−in DC/DC converter, based on
a charge pump structure, including the new 1.33X mode of operation,
improving the efficiency over the full input battery supply voltage
span over 90%.
Features
2.7 to 5.5 V Input Voltage Range
Consistent 85% Efficiency
1.0 mA Quiescent Supply Current
All Pins are Fully ESD Protected
Built−in Short Circuit Protection
Provides Four Independent LED Drives
200 kHz Digital Dimming Function
Unloaded LED Protection
Short Circuit Current Proof
Tight 0.5% LED Current Matching
These are Pb−Free Devices
Typical Applications
Portable Back Light
Digital Cellular Phone Camera Photo Flash
LCD and Key Board Simultaneously Drive
http://onsemi.com
MARKING
ÇÇÇÇWQFN16 (3x3)
DIAGRAM
16
1
NCPx
MT SUFFIX
5604
1 CASE 488AK
ALYWG
G
NCPx5604 = Specific Device Code
x = A or B
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
16 15 14 13
Vbat 1
12 VOUT
EN 2
11 C1P
IREF 3
10 C1N
AGND 4
9 PGND
56 78
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
* Pin 5 in not connected in the NCP5604B
(Top View)
ORDERING INFORMATION
Device
NCP5604AMTR2G
Package Shipping
WQFN16 3000/Tape & Reel
(Pb−Free)
NCP5604BMTR2G WQFN16 3000/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 0
1
Publication Order Number:
NCP5604/D

1 page




NCP5604B pdf
NCP5604A, NCP5604B
PIN FUNCTION DESCRIPTION
Pin Symbol
Type
Description
1
VBAT
INPUT, POWER
Input Battery voltage to supply the analog and digital blocks. The pin must be decoupled to
ground by a 1.0 mF ceramic capacitor.
2
EN
INPUT, DIGITAL
This pin carries the Enable function to control the DC−DC converter. It can be used to
digitally dim the LED by using a PWM technique.
EN = Low ³ shutdown mode, the DC−DC is disconnected from the load.
EN = High ³ operating mode, the DC−DC is activated.
The digital PWM dimming can operate over the 100 Hz − 200 kHz frequency, depending
upon the application requirements.
3
IREF
INPUT, ANALOG
This pin provides the reference current, based on the internal bandgap voltage reference,
to control the output current flowing in the LED. A 1% tolerance, or better, resistor shall be
used to get the highest accuracy of the LED biases. An external current source can be
used to bias this pin to dim the light coming out of the LED.
In no case shall the voltage at pin 3 be forced either higher or lower than the 600 mV
provided by the internal reference.
4 AGND
POWER
This pin is the GROUND signal for the analog and digital blocks and must be connected to
the system ground.
5
LED4
INPUT, POWER
NCP5604A: This pin sinks to ground and monitors the current flowing into the fourth LED,
intended to be used in backlight application. The current is limited to 25 mA maximum
(Note 2).
NCP5604B: This pin is not connected.
6
LED3
INPUT, POWER
This pin sinks to ground and monitors the current flowing into the third LED, intended to be
used in backlight application. The current is limited to 25 mA maximum (Note 2).
7
LED2
INPUT, POWER
This pin sinks to ground and monitors the current flowing into the second LED, intended to
be used in backlight application. The current is limited to 25mA maximum (Note 2).
8
LED1
INPUT, POWER
This pin sinks to ground and monitors the current flowing into the first LED, intended to be
used in backlight application. The current is limited to 25 mA maximum (Note 2).
9 PGND
POWER
This pin is the GROUND reference for the DC−DC converter and the output current
control. The pin must be connected to the system ground, a ground plane being strongly
recommended.
10 C1P
POWER
One side of the external charge pump capacitor (CFLY) is connected to this pin, associated
with C1N, pin 11 (Note 1).
11 C1N
POWER
One side of the external charge pump capacitor (CFLY) is connected to this pin, associated
with C1P, pin 10 (Note 1).
12 VOUT OUTPUT, POWER This pin provides the output voltage supplied by the DC−DC converter. The Vout pin must
be bypassed by 1.0 mF ceramic capacitor located as close as possible to the pin to
properly bypass the output voltage to ground. The circuit shall not operate without such
bypass capacitor properly connected to the Vout pin.
The output voltage is internally clamped to 5.5 V in the event of no load situation. On the
other hand, the output current is limited to 100 mA in the event of a short circuit to ground.
13 C2P
POWER
One side of the external charge pump capacitor (CFLY) is connected to this pin, associated
with C2N, pin 14 (Note 1).
14 C2N
POWER
One side of the external charge pump capacitor (CFLY) is connected to this pin, associated
with C2P, pin 13 (Note 1).
15 C3P
POWER
One side of the external charge pump capacitor (CFLY) is connected to this pin, associated
with C3N, pin 16 (Note 1).
16 C3N
POWER
One side of the external charge pump capacitor (CFLY) is connected to this pin, associated
with C3P, pin 15 (Note 1).
1. Using low ESR 1.0 mF ceramic capacitor is mandatory to optimize the Charge Pump efficiency. The DC Bias effect must be taken into account
when selecting the ceramic capacitor. Smallest foot print packages (size 0602 and lower) are prone to strong DC bias effect, reducing the real
capacitance significantly.
2. Total DC−DC output current is limited to 100 mA.
3. The exposed flag shall be connected to ground.
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5

5 Page





NCP5604B arduino
NCP5604A, NCP5604B
and 23 mA when Q1 is ON. The concept can use either a
DC drive or a pulsed mode to dynamically dim the light out
of the LED.
A different analog approach, but more complex solution,
can be derived from either a DC or a pulsed voltage
associated with a current mirror built with low cost discrete
devices (see Figure 14). The associated filter (R2/R3/C1)
provides a continuous voltage to the current mirror, thus a
digitally controlled continuous output current. Generally
speaking, the PWM frequency could be either in the low
end 20 Hz to 200 Hz band, or above the audio band (25 kHz
and beyond) to make sure the dimming can be adjusted
from zero to 100% without any audible noise. As a matter
of fact, the NCP5604A has been designed to guarantee
200 kHz PWM at the ENABLE pin.
The current mirror can be largely improved by using an
external operational amplifier to get a very stable and
temperature independent current, but such a solution could
turn out to be too expensive and, generally speaking, the
basic structure given, Figure 13, gives good results since
the current depends mostly upon the quality of resistor R2.
ENABLE
1
VBAT
2
EN
3
IREF
High Out
Q1
4
AGND
9 PGND
C2P
C2N
C3P
C3N
VOUT
GND
Figure 13. Basic Analog Dimming Control
1
VBAT
C2P
ENABLE
V = 3.3 V
PWM
R1
12 k
R2
15 k
2 EN
3
IREF
BC846BDW
4
AGND
9 PGND
GND
C2N
C3P
C3N
VOUT
GND
GND
Figure 14. Basic Analog PWM Dimming Control
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