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MC33170 Datasheet(PDF) 5 Page - ON Semiconductor

No. de Pieza. MC33170
Descripción  RF Amplifier Companion Chip for Dual-Band Cellular Subscriber Terminal
Descarga  16 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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MC33170 Datasheet(HTML) 5 Page - ON Semiconductor

 
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MC33170
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5
Characteristic
Unit
Max
Typ
Min
Symbol
Pin #
PROTECTION AND STABILIZATION CIRCUIT
(For typical values TA = 25°C, for min/max values TA = –40°C to +85°C, Max TJ = 125°C unless otherwise noted)
Negative bias present
12
–4.2
V
No Negative protection disabled
12
2.5
V
Regulation level
12
–5.4
–5.0
–4.6
V
Sink current
12
5.0
MA
STEERING SWITCHES, SERIES RESISTANCE
(For typical values TA = 25°C, for min/max values TA = –40°C to +85°C, Max TJ = 125°C unless otherwise noted)
GSM–900 @ Id = 1mA, Vbat = 5.5V
3
60
160
W
DCS–1800 @ Id = 1mA, Vbat = 5.5V
4
60
160
W
Power Amplifier Startup @ Id = 50mA, Vbat = 5.5V
5
1.0
2.0
W
Lack of negative circuitry behavior:
The MC33170 hosts a circuitry that prevents the power
modulation startup if the negative bias is not established.
However, to accommodate with PAs that do make use of a
negative bias, it is possible to connect pin 13 to pin 7 and thus
invalidate the protection circuitry. The below sketch details
the available levels to fulfil this function
OK
OK
NOT OK
2.5V
0V
–4.2V
–5V
Vpin 13
MC33170 operating truth table, pin levels:
TxEN
Band Selection
Common Enable
GSM–900
DCS–1800
PA startup
X
X
0
High–impedance
High–impedance
High–impedance
0
X
1
High–impedance
High–impedance
High–impedance
1
0
1
VLDO–Io.RDS(ON)
High–impedance
VBAT–Io.RDS(ON)
1
1
1
High–impedance
VLDO–Io.RDS(ON)
VBAT–Io.RDS(ON)
Io is the current delivered by the considered pin, RDS(ON) is the switch series resistance as defined in the section Steering
Switches


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