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參數(shù)資料
| 型號(hào)： | L5950 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | MULTIPLE MULTIFUNCTION VOLTAGE REGULATOR FOR CAR RADIO |
| 中文描述： | 多重電壓調(diào)節(jié)器多功能車(chē)內(nèi)廣播 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大小： | 132K |
| 代理商： | L5950 |
Symbol
CHARACTERISTICS FOR I
2
C
V
IL
LOW Level Input Voltage
V
IH
HIGH Level Input Voltage
V
HYS
Input Hysteresis
V
OL1
LOW Level Output
Parameter
Test Condition
Min.
Typ.
Max.
Unit
1.5
V
V
V
V
3
0.2
V
OL2
I
I
f
SCL
Sink Current = 3mA
Sink Current = 6mA
0.4V
≤
V
I
≤
0.9V
DDmax
0.4
0.6
10
400
V
μ
A
kHz
Input Current
SCL Clock Frequency
-10
ELECTRICAL CHARACTERISTICS
(continued)
FUNCTIONAL DESCRIPTION
The three high side drivers are a 2.0A output
(HSD1), and two 450mA outputs (HSD2 & 3). The
five regulator outputs are a 10V at 350mA
(REG1), an 8.5V at 175mA (REG2), a 5V at
350mA (REG3), an 8V/10V at 1A (REG4), and 5V
at 250mA (REG5). The regulators are low drop-
out. The regulators will operate with output ca-
pacitors with ESR of 0.1
to 5
.
The 8.5V regulator output (REG2) is a tighter tol-
erance output than the other regulator outputs.
The 8.5V output is a
±
2.5% (5% total range) out-
put over temperature. This is required on the
regulator to improve performance and reduce
cost on the 8.5V driven IC’s in the radio. The
tighter tolerance is possible by performing a trim
of the bandgap reference to the 8.5V output. The
other outputs are
±
5% variation over temperature.
REG3 is referenced from the VREF input not the
internal bandgap. This is done to minimize the
voltage offset between individual 5V supplies.
The REG2 and REG3 outputs are turned on and
off with the Enable input, a ’1’ turns the outputs on
and a ’0’ turns them off. When Enable is "1", the
other outputs can be independently controlled via
the I
2
C bus. When a given regulator is turned off it
must be guaranteed to be lower than 0.2V. The
output voltage of REG4 is selected via bit 5 of the
I
2
C data byte: 8V is the output voltage if bit5 = ’0’
while 10V is the output voltage when bit5 = ’1’.
When all outputs are turned off the total current
draw must be minimized. I
2
C will run at a clock
speed range of 100kHz to 400kHz. This device
should be capable of operating at any frequency
within this range.
Protection
The L5950 can survive under the following condi-
tions: shorting the outputs to BAT and GND, loss
of BAT, loss of IC GND, double battery(+26.5V),
4000V ESD, 34V load dump. L5950 will not han-
dle a reverse battery condition. External compo-
nents must be implemented for reverse battery
protection.
Thermal Shutdown: REG1, REG2, REG3, REG4,
REG5 outputs shutdown at 160°C and return to
normal operation at 130°C. The HSD2 and HSD3
shutdown at 160°C and return to normal opera-
tion at 130°C. The HSD1 with go into thermal
shutdown at 170°C and returns to operation at
120°C.
Current Limiting: each voltage regulator will con-
tain its own current protection.
Short Circuit: If the outputs are short circuited, the
IC will go into current limiting and eventually the
thermal shutdown will kick in. Current limiting will
not disable the outputs.
Overvoltage: The IC will not operate if the BAT
voltage reaches 27V typ. or above.
t
BUP
P
S
P
SDA
SCL
Sr
t
LOW
t
R
t
F
t
HD;DAT
t
HD;DAT
t
SU;DAT
t
SU;STA
t
HD;STA
t
SU;STO
D99AU1007
t
SP
t
HIGH
Figure 1. Definition of Timing on the I
2
C Bus.
L5950
5/8
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