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PDF KAC3301QN Data sheet ( Hoja de datos )
| Número de pieza | KAC3301QN | |
| Descripción | 1X/1. 5X Fractional Charge Pump for White LED Driver | |
| Fabricantes | KEC | |
| Logotipo |  |
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SEMICONDUCTOR
TECHNICAL DATA
1X/1. 5X Fractional Charge Pump for
White LED Driver with Dimming Control
The KAC3301 is low noise constant frequency charge pump DC/DC
converter specially designed to drive up to four white LEDs with constant
current from Li-ion cell. Dual (1x/1.5x) Modes and low dropout voltage of
LED driver maximize efficiency for the white LED application over full Li-ion
battery input range. The LED current is set by the external resistor. PWM(Pulse
Width Modulation) signal can be used to control LED brightness over wide
frequency range. Various kinds of protection circuits protect your system from
every undesirable output condition.
Features
1x/1.5x dual charge pump modes with auto detection.
Excellent Power Efficiency. (more than 92% of PMAX)
LED current matching of 2%.
Power-down current below 1uA.(max.)
Up to 30mA/LED current capability. [VIN > 3.1V]
Up to 20mA/LED current capability. [VIN > 2.7V]
Strong to ESD. [MM:>200V, HBM:>2000V]
Low input ripple and EMI.
PWM or Analog dimming control.
2.7V to 5.5V input voltage range.
Output over-voltage protection.
Thermal shutdown protection.
Output over-current protection.
Soft start limits Inrush current.
Automatic soft-start protects IC from output short.
1MHz switching frequency.
QFN-16 package.
KAC3301QN
Analog CMOS Integrated Circuits
www.DataSheet4U.com
A
Top View
E
13
H
16
1
94
85
B
Bottom View
Pin 1
Side View
DIM
A
B
C
D
E
F
G
H
I
J
K
MILLIMETERS
4.00 +_ 0.05
2.30 +_ 0.05
0.650BSC
0.55 +_ 0.05
0.33 +_ 0.05
0.45 +_ 0.05
2.40 +_ 0.05
R0.030 Max
0.05 Max
0.203 +_ 0.008
0.9 +_ 0.1
QFN16
Applications
Cellular phones, Smart Phones, PDA, Digital Cameras, Camcorders.
MP3 player and other handheld devices with color displays operating circuit.
Typical operating Circuit
VIN
1
1
1
8765
C1P VIN VOUT ISET
9 C1N
NC 4
RSET
10 C2N
NC 3
11 C2P
DIM 2
12 GND
EN 1
D1 D2 D3 D4
13 14 15 16
H:ON L:OFF
H:ON L:OFF
1
Pin Configuration
D4 D3 D2 D1
16 15 14 13
EN 1
12 GND
DIM 2
NC 3
QFN-16
TOP VIEW
11 C2P
10 C2N
NC 4
9 C1N
5678
ISET VOUT VIN C1P
2005. 9. 9
Revision No : 0
1/8
1 page  
KAC3301QN
www.DataSheet4U.com
Shutdown (Enable=Low)
When voltage of the ENABLE pin goes under 0.4V, KAC3301 enter the shutdown mode where input current go to zero and there are no
current between output capacitors and transfer capacitor.
Soft-Start
KAC3301 has its original soft-start function to limit inrush current at turn on. KAC3301 charges transfer capacitors and output capacitor
with a constant input current until output voltage goes to the value of (1.4 VIN). If output voltage reached the value of (1.4 VIN) or
over-voltage protection circuit is activated, LED current start to flow. But input current remains to zero until output voltage goes down to
usual output operating voltage from the discharge of LED current. At the every turn on the ENABLE and output voltage less than 25% of
the input voltage, soft-start sequence is introduced for the safety.
Short protection (various short mode)
1) short VOUT pin to GND pin: If output is shorted to ground, output current is limited by the soft-start which is repeated until VOUT
remains under 25% of VIN.
2) short LED pin to GND pin: If this occurs at the soft-start-mode or shutdown state, KAC3301 stays at soft-start-mode. Else this is done
during operating, the output current is limited by the current-limitcircuitry.
3) short VOUT pin to LED pin(shorted LED): There are no change but shorted LED doesn t work.
Open protection
If more than one LED is opened, output voltage is limited by over-voltage-protect circuitry. But, other LEDs work continuously without
change of the brightness.
Current limit
There could be variable short mode in the backlight system. For example, VOUT pin to GND or LED pin to GND or short of LEDs, etc. In
these case, large current could be flow at the output pin. KAC3301 are protected by the Thermal shutdown circuitry, but external elements
might be damaged without current limit circuitry. Current limit circuitry set you to ease to design safely.
Over-voltage protection
When a LED pin shorted to the ground or LED is opened itself, voltage of the LED terminal could be almost 0V without any concerning to
the other conditions. In this case, output voltage might be raised over IC’s maximum ratings. And, then IC may be destroyed! KAC3301
maintains over voltage protection circuitry for the prohibiting output voltage over the maximum ratings.
Thermal shutdown
KAC3301 includes a thermal shutdown circuit which makes IC shutdown at 150 (typ.) and recover after IC cools by
approximately 40 .
Input Ripple
For LED drive ICs in mobile system, input ripple is more important than output ripple, because there are many other components which
have input supply terminal from battery instead of the output terminal. KAC3301 has very excellent input ripple characteristics which is
depends on the supply’s impendence. You can get better input ripple characteristics, by minimizing resistance from battery to the VIN pin.
2005. 9. 9
Revision No : 0
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet KAC3301QN.PDF ] | |
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