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LM3631 Arkusz danych(PDF) 6 Page - Texas Instruments

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Numer części LM3631
Szczegółowy opis  Complete LCD Backlight and Bias Power
Download  57 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

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LM3631
SNVS834 – AUGUST 2014
www.ti.com
7.4 Thermal Information
DSBGA
THERMAL METRIC(1)
UNIT
(20 PINS)
RθJA
Junction-to-ambient thermal resistance
63.5
RθJC
Junction-to-case (top) thermal resistance
0.3
RθJB
Junction-to-board thermal resistance
9.4
°C/W
ΨJT
Junction-to-top characterization parameter
1.6
ΨJB
Junction-to-board characterization parameter
9.3
(1)
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
7.5 Electrical Characteristics
Unless otherwise specified, limits apply over the full operating ambient temperature range (
−40°C ≤ TA ≤ 85°C), VIN = 3.6 V,
VPOS = VOREF = 5.4 V, VNEG = –5.4 V, VBST = 5.7 V, VCONT = 3.3V.
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
CURRENT CONSUMPTION
ISD
Shutdown current
nRST = LOW, LCD_EN = LOW
1
µA
Quiescent current, device not
nRST = HIGH, LCD_EN = LOW,
IQ
60
µA
switching
2.7 V
≤ VIN ≤ 5 V
nRST = HIGH, LCD_EN = HIGH,
mA
ILCD_EN
2.7 V
≤ VIN ≤ 5 V, no load,
1
Backlight disabled
DEVICE PROTECTION
VIN decreasing
2.5
V
UVLO
Undervoltage lockout
VIN increasing
2.6
V
TSD
Thermal shutdown(1)
140
°C
TSD(hyst)
Hysteresis(1)
20
°C
LED CURRENT SINKS
Minimum output current
Brightness code 0x001
50
µA
Brightness code 0x7FF,
mA
Maximum output current
25
ILED1/2
exponential mapping
Brightness code 0x7FF, linear
mA
Maximum output current
25.3
mapping
2.7 V
≤ VIN ≤ 5.0 V, LED Currents
IACCURACY
Absolute LED current accuracy (2)
–3%
3%
0.05 mA, 1 mA, 5 mA, 25 mA
2.7 V
≤ VIN ≤ 5.0 V, LED Currents
IMATCH
LED1 to LED2 current matching (2)
0%
3%
0.05 mA, 1 mA, 5 mA, 25 mA
VHR_MIN
Current sink saturation voltage
ILED = 95% of 5 mA
30
50
mV
BACKLIGHT BOOST CONVERTER
Backlight boost output overvoltage
VOVP_BL
2.7 V
≤ VIN ≤ 5 V, 29-V Option
28.8
V
protection
ILED = 10 mA/string, 2P6S LED
ηLED_DRIVE
LED drive efficiency (1)
configuration
88%
1235AS-H-220M Inductor
ILED = 25 mA
250
mV
Regulated current sink headroom
VHR
voltage
ILED = 5 mA
100
mV
RDSON
NMOS switch on resistance
ISW = 250 mA
0.5
Ω
ICL
Selectable NMOS switch current limit
900-mA setting
900
mA
(1)
Typical value only for reference.
(2)
Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current.
Matching is the maximum difference from the average. For the constant current sinks on the part (LED1 and LED2), the following is
determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of both outputs
(AVG). Matching number is calculated: (MAX - MIN)/AVG. The typical specification provided is the most likely norm of the matching
figure of all parts. LED current sinks were characterized with 1-V headroom voltage. Note that some manufacturers have different
definitions in use.
6
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