LP55281 Datasheet, PDF (6/35 Pages) National Semiconductor (TI) – Quad RGB Driver

LP55281
SNVS458B – JUNE 2007 – REVISED JUNE 2007
www.ti.com
Electrical Characteristics ^{(1) (2)}
Limits in standard typeface are for T_J = 25°C. Limits in boldface type apply over the operating ambient temperature range (-
30°C < T_A < +85°C). Unless otherwise noted, specifications apply to the LP55281 Block Diagram with: V_DD1 = V_DD2 = 3.6V,
V_DDIO = 2.8V, C_VDD = C_VDDIO = 100 nF, C_OUT = C_IN = 10 µF, C_VDDA= 1 µF, C_REF = 100 nF, L1 = 4.7 µH, R_RGB = 8.2 kΩ and R_RT =
82 kΩ ⁽³⁾.
Symbol
Parameter
Condition
Min
Typ
Max
Units
I_DD
Standby supply current (V_DD1 + V_DD2 + NSTBY = L
leakage to SW, FB, RGB1-4, ALED) SCK = SS = SI = H
NRST = L
1
10
µA
No-Boost supply current (V_DD1 + V_DD2)
NSTBY = H, EN_BOOST = L
SCK = SS = SI = H
Audio synchronization and LEDs
OFF
350
µA
No-load supply current (V_DD1 + V_DD2) NSTBY = H, EN_BOOST = H, SCK
0.6
mA
= SS = SI = H
Audio synchronization and LEDs
OFF
Autoload OFF
Total RGB drivers quiescent current
(V_DD1 + V_DD2)
ALED driver current (V_DD1 + V_DD2)
EN_RGBx = H
ALED[7:0] = FFh
ALED[7:0] = 00h
250
µA
180
µA
0
µA
I_DDIO
Audio Synchronization current (V_DD1 +
V_DD2)
V_DDIO Standby Supply current
Audio Synchronization ON
V_DD1,2 = 2.8V
V_DD1,2 = 3.6V
NSTBY = L
SCK = SS = SI = H
390
µA
700
µA
1
µA
V_DDA
V_DDIO supply current
1 MHz SCK frequency in SPI mode,
20
µA
C_L = 50 pF at SO pin
Output voltage of internal LDO for
(4)
-3%
2.80
+3%
V
analog parts
MAGNETIC BOOST DC/DC CONVERTER ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Condition
Min
Typ
Max
Units
I_LOAD
Recommended Load Current
V_OUT
RDS_ON
f_Boost
Output Voltage Accuracy (FB pin)
Output Voltage (FB pin)
Switch ON resistance
PWM mode switching frequency
3.0V ≤ V_IN
V_OUT = 5V
3.0V ≤ V_IN
V_OUT = 4V
3.0V ≤ V_IN ≤ V_OUT - 0.5
V_OUT = 5V
1 mA ≤ I_LOAD ≤ 300 mA
V_IN > V_OUT + V_SCHOTTKY ⁽⁵⁾
V_DD1,2 = 3.0V, I_SW = 0.5 A
RT = 82 kΩ
freq_sel[2:0] = 1XX
0
300
0
400
-5
+5
V_IN -
V_schottky
0.4
0.8
2
mA
mA
%
V
Ω
MHz
Frequency Accuracy
2.7V ≤ V_DDA ≤ 2.9V
RT = 82 kΩ ± 1%
-7
±3
+7
%
-10
+10
t_PULSE
t_STARTUP
I_{SW_MAX}
Switch pulse minimum width
Startup time
SW pin current limit
no load
Boost startup from STANDBY ⁽⁶⁾
30
ns
10
ms
700
800
900
mA
550
950
RGB DRIVER ELECTRICAL CHARACTERISTICS (R1-4, G1-4, B1-4)
Symbol
Parameter
Condition
Min
Typ
Max
Units
(1) All voltages are with respect to the potential at the GND pins.
(2) Min and Max limits are guaranteed by design, test or statistical analysis. Typical numbers are not guaranteed, but do represent the most
likely norm.
(3) Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
(4) V_DDA output is not recommended for external use.
(5) When V_IN rises above V_OUT + V_SCHOTTKY, V_OUT starts to follow the V_IN voltage rise so that V_OUT = V_IN - V_SCHOTTKY
(6) Data guaranteed by design
6
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