LP3942 Datasheet, PDF (4/20 Pages) National Semiconductor (TI) – The Dual RGB LED Controller with 1.5x/2x Charge Pump and SPI Interface

Absolute Maximum Ratings (Notes 1,
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V_IN Pin: Voltage to GND
Voltage on R1, G1, B1, R2, G2,
B2 Pins
Voltage on All Other Pins
Continuous Power Dissipation
(Note 3)
Junction Temperature (T_J-MAX)
Storage Temperature Range
Maximum Lead Temperature
(Soldering)
−0.3V to +6.0V
−0.3V to P_OUT
+ 0.3V, with 6.0V max
−0.3V to V_IN +0.3V,
with 6.0V max
Internally Limited
150˚C
−65˚C to +150˚C
(Note 4)
ESD Rating (Note 5)
Human Body Model:
Machine Model:
2.0 kV
200V
Operating Ratings (Notes 1, 2)
Input Voltage Range
V_DD Voltage Range
Recommended Load Current
Junction Temperature (T_J) Range
Ambient Temperature (T_A) Range
(Note 6)
3.0V to 5.0V
2.69V to 2.87V
0 mA to 120 mA
−30˚C to +105˚C
−30˚C to +85˚C
Thermal Properties
Junction-to-Ambient Thermal Resistance
(θ_JA), LLP24 Package (Notes 6, 7)
A34˚C/W
Electrical Characteristics (Notes 2, 8)
Limits in standard typeface are for T_J = +25˚C. Limits in boldface type apply over the operating junction temperature range
(−30˚C ≤ T_A ≤ +105˚C). Unless otherwise noted, specifications apply to the LP3942 Typical Application Circuit (pg. 1) with:
V_VDD = 2.78V, V_IN 3.6V, C_IN = 2.2 µF, C₁ = 1.0 µF, C₂ = 1.0 µF, C_OUT = 3.0 µF, R_BIAS = 27k. (Note 9).
Symbol
Parameter
Condition
Min
Typ
Max
Units
CHARGE PUMP 1.5x MODE
V_POUT
Output Voltage
Accuracy (Note 10)
R_OUT
Output Resistance
G_CP
Charge Pump Gain
CHARGE PUMP 2x MODE
V_POUT
Output Voltage (Note 10)
R_OUT
G_CP
Output Resistance
Charge Pump Gain
3.4V < V_IN < 5.0V,
I_OUT ≤ 120 mA
3.0V < V_IN < 3.4V
3.4V < V_IN < 5.0V,
I_OUT ≤ 120 mA
V_DD = 3.0V
3.20V < V_IN < 5.0V,
I_OUT ≤ 120 mA
3.0V < V_IN < 3.2V,
I_OUT ≤ 80 mA
V_DD = 3.0V
4.5
V
(1.5xV_IN)
– (I_OUT x
R_OUT)
±3
±5
%
5
7
Ω
1.5
4.75
5.0
5.25
V
±3
±5
%
4.75
5.0
5.25
V
±3
±5
%
5
Ω
2
Symbol
I_Q(V_IN)
I_Q(V_DD)
I_SD(V_IN)
Parameter
Operating Quiescent Current
Operating Quiescent Current
Standby Quiescent Current
Condition
I_(OUT) = 0A (Note 11)
NSTBY = 0
NRST pin current excluded
Min
Typ
Max
Units
1.0
3.0
mA
200
300
µA
4
10
µA
I_SD(V_DD) Standby Quiescent Current
f_sw
Switching Frequency
t_start
Startup Time
NSTBY = 0,
SPI interface inputs at 0V or 1.8V
NRST pin current excluded
R_BIAS = 27 kΩ ± 1%
After writing ‘1’ to NSTBY AND
CP_ON. NRST must be ‘1’.
0.5
2
µA
500
625
750
kHz
1
2
ms
T_SHD
Shutdown Threshold.
Hysteresis
160
˚C
20
˚C
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