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LM3538 Datenblatt(PDF) 5 Page - Texas Instruments

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Teilenummer LM3538
Bauteilbeschribung  6-Channel WLED Driver with Four Integrated LDOs
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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LM3538
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SNVS674A – JUNE 2011 – REVISED MAY 2013
Charge Pump and LED Drivers Electrical Characteristics
(1) (2)
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the operating ambient temperature range
(
−30°C to +85°C). Unless otherwise specified: VIN_A = 3.6V; VHWEN = VIN_A; VDx = 0.4V; Group A = Group B = Fullscale
Current; C1 = C2 = CIN_A = COUT = 1.0µF.
(3)
Symbol
Parameter
Condition
Min
Typ
Max
Units
Output Current Regulation
2.7V
≤ VIN_A ≤ 5.5V
−7.5%
25
+7.5%
mA
GroupA
6 LEDs in Group A
Output Current Regulation
2.7V
≤ VIN_A ≤ 5.5V
−7.5%
25
+7.5%
mA
GroupB
2 LEDs in Group B
IDx
3.2V
≤ VIN_A ≤ 5.5V
Output Current Regulation
VLED = 3.6V
22.3
All LED Drivers Enabled
mA
BankA current code = 1111101b, exp dimming
DxA
All LED Drivers on BankA(4)
scale
2.7V
≤ VIN ≤ 5.5V
Group A (6 LEDs)
0.8
3
IDx-
LED Current Matching(5)
LED Current =
%
MATCH
Group B (2 LEDs)
0.4
3
Fullscale current
VDxTH
VDx 1x to 3/2x Gain Transition Threshold VDx Falling
135
mV
Current sink Headroom Voltage
IDx = 95% ×IDx (nom.)
VHR
100
mV
Requirement(6)
(IDx (nom) ≈ 20mA)
Gain = 3/2
2.4
Open-Loop Charge Pump Output
ROUT
Resistance(7)
Gain = 1
0.5
Gain = 1.5x, No Load. Current through VIN_A
2.9
4.4
pin. Sensor Bias OFF
IQ
Quiescent Supply Current
mA
Gain = 1x, No Load. Current through VIN_A
1.1
2.4
pin. Sensor Bias OFF
HWEN = 1.8V. All registers in factory defaults
ISB
Standby Supply Current
1.2
µA
state. Current through VIN_A pin.
ISD
Shutdown Supply Current
HWEN = 0V. Current through VIN_A pin.
0.2
1.0
µA
fSW
Switching Frequency
1.1
1.3
1.6
MHz
tSTART
Start-up Time
See(8)
250
µs
VALS
ALS Reference Voltage
−6%
1.0
+6%
V
RALS register setting = 00010b
−6%
10.1
+6%
RALS
Internal ALS Resistor
k
RALS register setting = 00100b
−6%
5.0
+6%
(1)
All voltages are with respect to the potential at the GND pins.
(2)
Min and Max limits are specified by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most
likely norm.
(3)
CIN_X, COUT, CLDOX, CSEN, C1, and C2 : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
(4)
The total output current can be split between the two groups (IDx = 25mA Max). Under maximum output current conditions, special
attention must be given to input voltage and LED forward voltage to ensure proper current regulation. The maximum total output current
for the LM3538 should be limited to 150mA.
(5)
For the two groups of current sinks on a part (Group A and Group B), the following are determined: the maximum sink current in the
group (MAX), the minimum sink current in the group (MIN), and the average sink current of the group (AVG). For each group, two
matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered the
matching figure for the group. The matching figure for a given part is considered to be the highest matching figure of the two groups.
The typical specification provided is the most likely norm of the matching figure for all parts.
(6)
For each Dxpin, headroom voltage is the voltage across the internal current sink connected to that pin. For Group A and B current sinks,
VHRx = VOUT -VLED. If headroom voltage requirement is not met, LED current regulation will be compromised.
(7)
Specified by design.
(8)
Turn-on time is measured from the moment the charge pump is activated until the VOUT crosses 90% of its target value.
Copyright © 2011–2013, Texas Instruments Incorporated
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