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PDF L5955 Data sheet ( Hoja de datos )
| Número de pieza | L5955 | |
| Descripción | Multiple multifunction voltage regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L5955
Multiple multifunction voltage regulator for car radio
Features
■ 2 stand-by regulators:
3.3V (125mA)
1.5V (300mA)
■ 6 regulators:
10V (40mA)
8.5V (200mA)
3.3V (850mA)
8/10V (1A)
5/3.3/1.8V (200mA)
1.8/2.5V(200mA)
■ All regulators are low dropout outputs
■ The different outputs voltage are controlled by
I2C Bus.
■ Reg3 on/off controlled by enable
■ Reg1, Reg2, Reg4, Reg5, Reg6 on/off
controlled by I2CBus.
■ 3 high side drivers:
2A (HSD1)
0.45A (HSD2 & HSD3)
■ No external charge pump capacitors are
required
■ Stand-by mode controlled by EN pin for I2C
Bus and Reg1, Reg2, Reg3, Reg4, Reg5,
Reg6, HSD1, HSD2, HSD3
■ LVW function externally selectable
■ Individual thermal shutdown
Flexiwatt27
■ Independent current limiting
■ Short circuit protection
■ Load dump protection and overvoltage
shutdown
Description
The L5955 is an integration of three high side
drivers, six regulators and two stand-by regulators
with RESET function developed to provide the
power to a complete audio system.
The outputs of the IC are controlled by I2C bus
and Enable pin.
The device is equipped with sequencing and slew
rate controls for the st-by regulators.
Table 1.
Device summary
Order code
L5955
Package
Flexiwatt27
Packing
Tube
August 2007
Rev 1
1/17
www.st.com
17
Free Datasheet http://www.datasheet4u.com/
1 page  
L5955
Electrical specification
2.3 Electrical characteristics
Table 4.
Symbol
Electrical characteristics
(Refer to the application circuit, Vbat =Vbat1+Vbat2+Vbat3= 14V, IST-BY1 = 0.5mA, IST-BY2 =
0.5mA, IREG1 = IREG2 = IREG3 = IREG4 = IREG5 = IREG6 = 5mA, RHSD1 = RHSD2 = RHSD3 = 16Ω)
Parameter
Test condition
Min. Typ. Max. Unit
IqST-BY Stand-by quiescent current
Iq Maximum quiescent current
IEN Enable input current
Vbat = 14V, EN = 0.
IST-BY1 = Istby2=100uA,
IQ(Vbat)=Ivbat1+Ivabt2+Ivbat3
Vbat = 14V, EN=VSTBY1
Istby1=125mA Istby2=300mA
IREG1 = 40mA
IREG2 = 200mA, IREG3 = 850mA
IREG4 = 1A, IREG5 = 250mA
IREG6 = 200mA, IHSD1 = 2A
IHSD2,3 = 450mA
Vbat = 14V; 5V<Enable ≥ 0V;
170 μA
100 mA
μA
10
VIL Enable threshold voltage
VIH
VL MRST
MRST output voltage
VH MRST
Vbat = 14V;
VST-BY1 = 0.5V to VTH (ST-BY1)
VST-BY2 = 0.5V to VTH (ST-BY2)
Rising
VST-BY1 = VTH (ST-BY1) to 0.5V
VST-BY2 = VTH (ST-BY2) to 0.5V
Falling
2
0
0
0
0
V
0.8
V
0.4
V
0.4
0.4
V
0.4
VTH MRST MRST output voltage threshold
Force VST-BY1 & VST-BY2
Low until MRST asserted
VST-BY2
· 0.93
VST-BY1
· 0.93
VST-BY2
· 0.97
VST-BY1
· 0.97
V
V
td MRST MRST delay time
tpor MRST Power on reset delay time
see Figure 4
CMRSTLY = 220nF
see Figure 4
13
20
μs
ms
tf MRST MRST fall time
RRST = 47kΩ, CRST = 50pF
see Figure 4
1 μs
ISCR MRST MRSTDLY current
ILKG MRSTDLY leakage current
MRSTDLY
Vsat MRSTDLY saturation voltage
MRSTDLY
VTH LVWIN input voltage threshold
ILKG lvwin input leakage current
VOH LVW output voltage
MRSTDLY = 0
MRSTDLY = 5V
IMRSTDLY =0.5mA
1.25 V (nominal)
IOH=-100µA
6
0
1.22
VSTBY1
-0.2
12 μA
6 μA
0.4 V
1.28 V
2 µA
VSTBY1 V
5/17
Free Datasheet http://www.datasheet4u.com/
5 Page 
L5955
Figure 4. Reset timing
<td MRST
<td RSTR6
td MRST
td RSTR6
Functional description
tpor
VREG6
VSTBY1 or 2
MRST*
RSTR6
Figure 5. SLEW function
V
3.3V
1.5V
tf MRST
tf RSTR6
D02AU1402
VSTBY1
VSTBY2
tON
Figure 6. Sequencing function
V
VBAT
V
STBY1
dVIag
STBY2
dVlead
D02AU1404
t
t
dVIag
t
11/17
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet L5955.PDF ] | |
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