LP3950 Datasheet, PDF (5/38 Pages) National Semiconductor (TI) – Color LED Driver with Audio Synchronizer

LP3950
www.ti.com
SNVS331C – NOVEMBER 2004 – REVISED APRIL 2013
Thermal Properties
Junction-to-Ambient Thermal Resistance
(θ_JA), NPC0032A Package ⁽¹⁾
72°C/W
(1) Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power
dissipation exists, special care must be paid to thermal dissipation issues in board design.
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
(−40°C ≤ T_A ≤ +85°C). Unless otherwise noted, specifications apply to Figure 2 with: V_DD1 = V_DD2 = V_DDA = 2.8V, C_VDD1 =
C_VDD2 = C_VDDA = C_VDDIO = 100 nF, C_OUT = C_IN = 10 µF, C_VREF = 100 nF, L₁ = 4.7 µH and f_BOOST = 2.0 MHz ⁽³⁾.
Symbol
Parameter
Condition
Min
Typ
Max
Units
I_VDD
Standby Supply Current
(V_DD1 + V_DD2 + V_DDA current)
NSTBY = L (register)
SCK, SS, SI, NRST = H
No-Load Supply Current
(V_DD1 + V_DD2 + V_DDA current, boost off)
NSTBY = H (reg.)
EN_BOOST = L (reg.)
SCK, SS, SI, NRST = H
1
5
µA
300
400
µA
Full Load Supply Current
(V_DD1 + V_DD2 + V_DDA current, boost on)⁽⁴⁾
NSTBY = H (reg.)
EN_BOOST = H (reg.)
SCK, SS, SI, NRST = H
All Outputs Active
850
µA
I_VDDIO
V_DDIO Supply Current
1.0 MHz SCK Frequency
C_L = 50 pF at SO Pin
20
µA
I_VDDA
Audio Circuitry Supply Current⁽⁵⁾
INPUT_SEL = [10] (register)
550
µA
V_REF
Reference Voltage⁽⁶⁾
I_REF ≤ 1.0 nA Only for Test Purpose
1.230
V
(1) All voltages are with respect to the potential at the GND pins (GND1–3, GND_BOOST, GND_RGB, GNDA).
(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 are used in setting electrical characteristics.
(4) Audio block inactive.
(5) In single-ended and in differential mode one audio buffer only is active and I_VDDA will be reduced by 90 µA (typ).
(6) V_REF pin (Bandgap reference output) is for internal use only. A capacitor should always be placed between V_REF and GND1.
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