MAX9260GCB/V+TGG4 Maxim Integrated, MAX9260GCB/V+TGG4 Datasheet - Page 12

• Manufacturer Part Number: MAX9260GCB/V+TGG4
• Description: Serializers & Deserializers - Serdes Multimedia Serial Link
• Manufacturer: Maxim Integrated
• Type: Deserializerr

Specifications of MAX9260GCB/V+TGG4

• Rohs: yes
• Data Rate: 2.5 Gbit/s
• Input Type: CML
• Output Type: CMOS/LVCMOS
• Number Of Inputs: 1
• Number Of Outputs: 30
• Operating Supply Voltage: 1.7 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: TQFP-64 EP
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

Figure 1. Adjustable Output-Voltage Setting
During light-load operation, I
device enters skip mode operation. Skip mode turns off
the majority of circuitry and allows the output to drop
below regulation voltage before the switch is turned on
again. The lower the load current, the longer it takes for
the regulator to initiate a new cycle. Because the con-
verter skips unnecessary cycles and turns off the majority
of circuitry, the converter efficiency increases. When the
high-side FET stops switching for more than 50Fs, most
of the internal circuitry, including LDO, draws power from
V
tion from the battery to drop to only 30FA.
Thermal-overload protection limits the total power dissipa-
tion in the device. When the junction temperature exceeds
+175NC (typ), an internal thermal sensor shuts down
the internal bias regulator and the step-down converter,
Figure 2. Switching Frequency vs. R
OUT
(for V
OUT
3.0
2.5
2.0
1.5
1.0
0.5
0
12
= 3V to 5.5V), allowing current consump-
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V
I
SWITCHING FREQUENCY vs. R
LOAD
MAX16907
IN
= 14V
Overtemperature Protection
= 1.5A
15
Skip Mode/Standby Mode
R
FB
FOSC
18
INDUCTOR
(k I )
FOSC
V
OUT
21
R
R
36V, 2.2MHz Step-Down Converter
FB1
FB2
FOSC
P 185mA, the
24
with Low Operating Current
allowing the IC to cool. The thermal sensor turns on the IC
again after the junction temperature cools by 15NC.
Connect FB to BIAS for a fixed 5V output voltage. To set
the output to other voltages between 1V and 10V, con-
nect a resistive divider from output (OUT) to FB to GND
(Figure
following equation:
where V
The switching frequency, f
connected from FOSC to GND. See
correct R
For example, a 2.2MHz switching frequency is set with
R
lower inductor values and less output capacitance.
Consequently, peak currents and I
at higher switching frequencies, but core losses, gate
charge currents, and switching losses increase.
Three key inductor parameters must be specified for
operation with the device: inductance value (L), inductor
saturation current (I
select inductance value, the ratio of inductor peak-to-
peak AC current to DC average current (LIR) must be
selected first. A good compromise between size and loss
is a 30% peak-to-peak ripple current to average-current
ratio (LIR = 0.3). The switching frequency, input voltage,
output voltage, and selected LIR then determine the
inductor value as follows:
where V
efficiency is optimum for typical conditions). The switching
frequency is set by R
tion). The exact inductor value is not critical and can be
adjusted to make trade-offs among size, cost, efficiency,
and transient response requirements.
comparison between small and large inductor sizes.
FOSC
= 12kI. Higher frequencies allow designs with
1). Calculate R
FB
SUP
FOSC
= 1V (see the
, V
OUT
value for the desired switching frequency.
R
L
Applications Information
FB1
=
, and I
SAT
V
FOSC
=
OUT
V
Setting the Output Voltage
R
SUP SW OUT
FB1
), and DC resistance (R
FB2
Electrical Characteristics
(V
OUT
SW
(see the
f
(OUT to FB resistor) with the
SUP







, is set by a resistor (R
V
I
are typical values (so that
V
OUT
MAX16907
−
FB
Internal Oscillator
V
Internal Oscillator
OUT
LIR
Figure 2



2
R losses are lower
Inductor Selection
−
1
Table 1
)




to select the
DCR
shows a
table).
FOSC
). To
sec-
)