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PDF RT9360B Data sheet ( Hoja de datos )
| Número de pieza | RT9360B | |
| Descripción | (RT9360A/B) White LED Driver | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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WhiteheLeEt4DUD.croivmer (Charge Pump with CurRreTn9t3S6o0uArc/Be)General Description
taSThe RT9360 is a compact, high efficient and high
aintegration charge pump with current matched white LED
.Ddriver. It can support 1 to 4 White LED's and optimized
wfor Li-Ion battery applications. The four WLEDs current
ware matched for consistent brightness. User can control
wWLED on/off via three programming bits. The every
Features
z Very High Efficiency Over 90% of Battery Life
z Support up to 4 WLEDs
z Soft Start Function
z Short Circuit Protection
z Three Charge Pump Mode: X1, X1.5, X2
z 250kHz/1MHz Fixed Frequency Oscillator
WLED channel can support up to 30mA current.
z RoHS Compliant and 100% Lead (Pb)-Free
mOrdering Information
Applications
oRT9360A/B
z Mobile phone
.cPackage Type
QV : QFN-16L 4x4 (V-Type)
z White LED Backlighting
z Camera Flash LED lighting
UOperating Temperature Range
P : Pb Free with Commercial Standard
Pin Configurations
t4A : 250kHz
B : 1MHz
(TOP VIEW)
eNote :
RichTek Pb-free products are :
e−RoHS compliant and compatible with the current require-
hments of IPC/JEDEC J-STD-020.
S−Suitable for use in SnPb or Pb-free soldering processes.
12 11 10 9
LED4 13
LED3 14
LED2 15
GND
LED1 16
8 C1P
7 VIN
6 VOUT
5 ISET
−100%matte tin (Sn) plating.
1234
ataMarking Information
For marking information, contact our sales representative
.Ddirectly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
wTypical Application Circuit
QFN-16L 4x4
ww C1 1uF C2 1uF
DS9360A/B-09
+
Li-ion
Battery
CIN
1uF
September 2005
U.comHigh
t4Low
SheeRSET
8 9 11 10
C1P C1N C2P C2N
7 VIN
VOUT 6
RT9360A/B
1
2
3
EN
CTRL0
CTRL1
4 CTRL2
5 ISET
GND
LED1
LED2
LED3
LED4
16
15
14
13
12
www.DataFigure 1. For 4-WLEDs Application Circuit
COUT
1uF
www.richtek.com
1
1 page  
RT9360A/B
Absolute Maximum Ratings (Note 1)
z Input Voltage ------------------------------------------------------------------------------------------------------------- −0.3 to 6V
z Output Voltage ----------------------------------------------------------------------------------------------------------- −0.3 to 6V
z Power Dissipation, PD @ TA = 25°C
QFN−16L 4X4 ------------------------------------------------------------------------------------------------------------ 2.5W
z Package Thermal Resistance (Note 4)
QFN−16L 4x4, θJA ------------------------------------------------------------------------------------------------------- 40°C/W
z Junction Temperature -------------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
z Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C
z Storage Temperature Range ----------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) --------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
z Ambient Temperature Range ---------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 2.85V to 5.5V, C1 = C2 = 1.0μF (ESR = 0.03Ω, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Units
Input Supply Voltage
VIN
Undervoltage Lockout Threshold
VIN rising
Undervoltage Lockout Hysteresis
2.5 5.5 V
1.8 2.2 2.4 V
-- 50 -- mV
Current into LEDs
1, 2, 3 and 4
RT9360A
Quiescent Current RT9360B
RT9360A/B
ILED Accuracy (Note 5)
Current Matching (Note 6)
1x mode to 1.5x mode
Transition Voltage (VIN falling)
1.5x mode to 2x mode
Transition Voltage (VIN falling)
Oscillator Frequency
RSET = 24kΩ
ILED
RSET = 91kΩ
2.7V < VIN < 5.5V
3.1V < VIN < 5.5V
FOSC=250KHz, EN = High, No Load
IQ FOSC=1MHz, EN = High, No Load
VIN = 4.2V, EN = Low
ILED-ERR 2mA < ILED < 30mA
ILED-LED-ERR 2mA < ILED < 30mA
VTRANS1X
VLED= 3.5V, IOUT= 80mA
ILED1 = ILED2 = ILED3 = ILED4 = 20mA
VTRANS1.5X
FOSC
VLED= 3.5V, IOUT= 80mA
ILED1 = ILED2 = ILED3 = ILED4 = 20mA
RT9360A
RT9360B
18.5
4.5
2
2
--
--
--
--
--
--
--
200
0.8
20
5
--
--
1.5
3
1
2
1
3.75
2.85
250
1.0
21.5
5.5
20
30
2.0
4
10
7.5
5
3.85
2.95
300
1.2
mA
mA
mA
mA
mA
mA
uA
%
%
V
V
kHz
MHz
Input Current Limit
Output Over Voltage Protection
ILIMIT
VOVP
Short Circuit applied from VOUT to
GND
Open circuit at any LED that is
programmed to be in the on state
250 400 650 mA
-- 5.5 6
V
DS9360A/B-09 September 2005
To be continued
www.richtek.com
5
5 Page 
Applications Information
Selecting Capacitors
To get the better performance of RT9360, the selecting
of peripherally appropriate capacitor and value is very
important. These capacitors determine some parameters
such as input and output ripple, power efficiency,
maximum supply current by charge pump, and start-up
time. To reduce the input and output ripple effectively,
the low ESR ceramic capacitors are recommended.
Generally, to reduce the output ripple, increasing the
output capacitance COUT is necessary. However, this will
increase the start-up time of output voltage.
For LED driver applications, the input voltage ripple is
more important than output ripple. Input ripple is controlled
by input capacitor CIN, increasing the value of input
capacitance can further reduce the ripple. Practically, the
input voltage ripple depends on the power supply's
impedance. If a single input capacitor CIN cannot satisfy
the requirement of application, it is necessary to add a
low-pass filter. Figure 1 shows a C-R-C filter used on
RT9360A. The input ripple can be reduced less than
30mVp-p when driving 80mA output current.
VIN
2.2uF
1
2.2uF
RT9360A
VIN
Figure 1. C-R-C filter used to reduce input ripple
RT9360A/B
Setting the LED Current
The RT9360 can be set a fixed LEDs current by a resister
RSET connected from ISET to GND. RSET establishes the
reference current and mirrors the current into LED1,
LED2, LED3, and LED4. The current into LED is about
440 times of the current flows through the RSET, the
approximate setting formula is given as follows:
ILED
=
484(V)
RSET (Ω)
(1)
Figure 2 shows the typical value of RSET versus average
LED current and Table 1 shows the values of RSET for a
fixed LED current.
250
200
150
100
50
0
0 5 10 15 20 25 30
Figure 2. The typical curve of RSET vs. LED's average
current.
The flying capacitor C1 and C2 determine the supply
current capability of the charge pump and to influence
the overall efficiency of system. The lower value will
improve efficiency, but it will limit the LED's current at
low input voltage. For 4 X 20mA load over the entire input
range of 2.7 to 5.5V, a capacitor of 1μF is optimal.
Table 1. RSET Value Selection
ILED
(mA)
RSET
(kΩ)
Nearest Standard Values for
RSET (kΩ)
5 91.0
91.0
10 47.9
47.5
15 32.7
32.4
20 24.0
24.0
25 19.6
19.6
30 16.4
16.5
DS9360A/B-09 September 2005
www.richtek.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RT9360B.PDF ] | |
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