L5950 データシートの表示（PDF） - STMicroelectronics
部品番号
コンポーネント説明
一致するリスト
L5950 Datasheet PDF : 8 Pages
| |||
L5950
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
CHARACTERISTICS FOR I2C
VIL
LOW Level Input Voltage
VIH
HIGH Level Input Voltage
VHYS
Input Hysteresis
VOL1
LOW Level Output
Test Condition
Sink Current = 3mA
VOL2
II
fSCL
Input Current
SCL Clock Frequency
Sink Current = 6mA
0.4V ≤ VI ≤ 0.9VDDmax
Min. Typ. Max. Unit
1.5
V
3
V
0.2
V
0.4
V
0.6
V
-10
10
µA
400 kHz
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 0.1Ω to 5Ω.
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 I2C 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
I2C data byte: 8V is the output voltage if bit5 = ’0’
Figure 1. Definition of Timing on the I2C Bus.
while 10V is the output voltage when bit5 = ’1’.
When all outputs are turned off the total current
draw must be minimized. I2C 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.
SDA
tBUP
SCL
P
S
tLOW
tR
tHD;DAT
tHD;DAT
tHIGH
tF
tHD;STA
tSP
tSU;DAT
tSU;STA
Sr
D99AU1007
tSU;STO
P
5/8
Share Link: 