LP3958 Datasheet, PDF (5/36 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter

LP3958
www.ti.com
SNVS423C – JANUARY 2006 – REVISED MARCH 2013
Electrical Characteristics ^{(1) (2)}
Limits in standard typeface are for T_J = 25º C. Limits in boldface type apply over the operating ambient temperature range (-
30ºC < T_A < +85ºC). Unless otherwise noted, specifications apply to the LP3958 Block Diagram with: V_DD1,2 = 3.0 ... 5.5V,
C_VDD = C_VDDIO = 100nF, C_OUT = 2 x 4.7µF, C_IN = 10µF, C_VDDA = 1µF, C_VREF = 100nF, L1 = 10µH, R_KEY = 8.2kΩ and R_RT =
82kΩ ⁽³⁾.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
I_VDD
Standby supply current
(V_DD1, V_DD2)
No-boost supply current
(V_DD1, V_DD2)
No-load supply current
(V_DD1, V_DD2)
NSTBY = L
Register 0DH=08H ⁽⁴⁾
NSTBY = H,
EN_BOOST = L
NSTBY = H,
EN_BOOST = H
Autoload OFF
1.7
7
µA
300
800
µA
750
1300
uA
V_DDA
V_REF
Output voltage of internal LDO
Reference voltage ⁽⁵⁾
I_VDDA = 1mA
2.80
V
-3
+3
%
1.23
V
(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) Boost output voltage set to 8V (08H in register 0DH) to prevent any unneccessary current consumption.
(5) No external loading allowed for V_REF pin.
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