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LM27964 Datenblatt(PDF) 4 Page - Texas Instruments

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Teilenummer LM27964
Bauteilbeschribung  LM27964 White LED Driver System with I2C Compatible Brightness Control
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Direct Link  http://www.ti.com
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LM27964
SNOSAL6D – MAY 2005 – REVISED MAY 2013
www.ti.com
Electrical Characteristics
(1) (2)
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: VIN = 3.6V; VDxA = 0.4V; VDxB = 0.4V; VDKEY = 0.4V; RSETA = RSETB = RSETK = 16.9kΩ; BankA,
BankB, and DKEY = Fullscale Current; ENA, ENB, ENK Bits = “1”; C1=C2=1.0µF, CIN=COUT=2.2µF; Specifications related to
output current(s) and current setting pins (IDxx and ISETx) apply to BankA, BankB and DKEY.
(3)
Symbol
Parameter
Condition
Min
Typ
Max
Units
3.0V
≤ VIN ≤ 5.5V
13.77
16.83
mA
BankA or BankB Full-Scale
15.3
(-10%)
(+10%)
(%)
ENA or ENB = "1", ENK = “0”
3.0V
≤ VIN ≤ 5.5V
Output Current Regulation
BankA or BankB Half-Scale
7.5
mA
BankA or BankB Enabled
ENA or ENB = "1", ENK = “0”
2.7V
≤ VIN ≤ 3.0V
BankA or BankB Full-Scale
15
mA
IDxx
ENA or ENB = "1", ENK = “0”
3.0V
≤ VIN ≤ 5.5V
Output Current Regulation
52.8
67.2
mA
DKEY Full-Scale
60
Keypad Driver Enabled
(-12%)
(+12%)
(%)
ENA = ENB = “0”, ENK = “1”
3.2V
≤ VIN ≤ 5.5V
30
RSETA = 8.3kΩ, RSETK = 16.9kΩ
DxA
Output Current Regulation
VLED = 3.6V
mA
BankA and DKEY Enabled(4)
60
BankA and DKEY Full-Scale
DKEY
ENA = ENK = “1”, ENB = “0”
Gain = 3/2
2.75
Open-Loop Charge Pump Output
ROUT
Resistance
Gain = 1
1
VDxx 1x to 3/2x Gain Transition
VDxTH
VDxA and/or VDxB Falling
375
mV
Threshold
IDxx = 95% ×IDxx (nom.)
(IDxx (nom) ≈ 15mA)
180
BankA and/or BankB Full-Scale
Gain = 3/2, ENA and/or ENB = "1"
Current Source Headroom Voltage
VHR
mV
Requirement(5)
IDKEY = 95% ×IDKEY (nom.)
(IDKEY (nom) ≈ 60mA)
180
DKEY Full-Scale
Gain = 3/2, ENK = "1"
IDxx-MATCH
LED Current Matching
See(6)
0.2
2
%
IQ
Quiescent Supply Current
Gain = 1.5x, No Load
1.3
1.7
mA
ISD
Shutdown Supply Current
All ENx bits = "0"
3.0
5
µA
VSET
ISET Pin Voltage
2.7V
≤ VIN ≤ 5.5V
1.25
V
IDxA-B /
Output Current to Current Set Ratio
200
ISETA-B
BankA and BankB
IDKEY /
Output Current to Current Set Ratio
800
ISETK
DKEY
fSW
Switching Frequency
500
700
900
kHz
tSTART
Start-up Time
POUT = 90% steady state
250
µs
(1)
All voltages are with respect to the potential at the GND pin.
(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, CPOUT, C1, and C2 : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics
(4)
The maximum total output current for the LM27964 should be limited to 180mA. The total output current can be split among any of the
three banks (IDxA = IDxB = 30mA Max., IDKEY = 80mA Max.). Under maximum output current conditions, special attention must be given
to input voltage and LED forward voltage to ensure proper current regulation. See the Maximum Output Current section of the datasheet
for more information.
(5)
For each IDxx output pin, headroom voltage is the voltage across the internal current sink connected to that pin. For Group A and B
outputs, VHR = VOUT -VDxx. If headroom voltage requirement is not met, LED current regulation will be compromised.
(6)
For the two groups of outputs on a part (BankA and BankB), the following are determined: the maximum output current in the group
(MAX), the minimum output current in the group (MIN), and the average output 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 bank. The matching figure for a given part is considered to be the highest matching figure of the two banks. The
typical specification provided is the most likely norm of the matching figure for all parts.
4
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