LP3954 Datasheet, PDF (6/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
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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 LP3954 Block Diagram with: V_DD1 = V_DD2 = 3.6V,
V_DDIO = 2.8V, C_VDD = C_VDDIO = 100nF, C_OUT = C_IN = 10µF, C_VDDA = 1µF, C_REF = 100nF, L₁ = 4.7µH, R_FLASH =1.2k, R_RGB =5.6k
and R_RT =82k ⁽³⁾.
Parameter
Test Conditions
Min
Typ
Max
Unit
I_VDD
Standby supply current
(V_DD1, V_DD2)
No-boost supply current
(V_DD1, V_DD2)
NSTBY = L
SCK, SS, SI
NSTBY = H,
EN_BOOST = L
SCK, SS, SI
Audio sync and LEDs OFF
1
8
µA
400
µA
No-load supply current
(V_DD1, V_DD2)
NSTBY = H,
EN_BOOST = H
SCK, SS, SI
Audio sync and LEDs OFF
Autoload OFF
1
mA
RGB drivers
CC mode at R1, G1, B1 and R2, G2,
150
µA
(V_DD1, V_DD2)
B2 set to 15mA
SW mode
150
I_VDDIO
WLED drivers
(V_DD1, V_DD2)
Audio synchronization
(V_DD1, V_DD2)
Flash
(V_DD1, V_DD2)
V_DDIO Standby Supply current
4+2 banks I_OUT/LED 25mA
Audio sync ON
V_DD1,2 = 2.8V
V_DD1,2 = 3.6V
I(R_FLASH)=1mA
Peak current during flash
NSTBY = L
SCK, SS, SI = H
500
µA
390
µA
700
2
mA
1
µA
V_DDIO supply current
1MHz SCK frequency in SPI mode,
20
µA
C_L = 50pF at SO pin
I_{EXT_LDO}
V_DDA
External LDO output current
(V_DD1, V_DD2, V_DDA)
Output voltage of internal LDO
for analog parts
7V tolerant application only
I_BOOST = 300mA
(4)
6.5
mA
2.72
2.80
2.88
V
-3
+3
%
(1) All voltages are with respect to the potential at the GND pins.
(2) Min and Max limits are ensured by design, test, or statistical analysis. Typical numbers are not ensured, 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.
6
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