MAX17010ETL+ Maxim Integrated Products, MAX17010ETL+ Datasheet - Page 15

• Manufacturer Part Number: MAX17010ETL+
• Description: IC REG BOOST SW STEPUP 40-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17010ETL+

• Applications: LCD Monitor, Notebook Display
• Current - Supply: 50µA
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Internal-Switch Boost Regulator with Integrated
Using the circuit’s minimum input voltage (2.2V) and
estimating efficiency of 80% at that operating point:
The ripple current and the peak current are:
The total output-voltage ripple has two components: the
capacitive ripple caused by the charging and dis-
charging of the output capacitance, and the ohmic rip-
ple due to the capacitor’s equivalent series resistance
(ESR):
and:
where I
Inductor Selection section). For ceramic capacitors, the
output-voltage ripple is typically dominated by
V
teristics of the output capacitor must also be considered.
The input capacitor (C
drawn from the input supply and reduces noise injec-
tion into the IC. A 10µF ceramic capacitor is used in the
Typical Applications Circuit (Figure 1) because of the
high source impedance seen in typical lab setups.
Actual applications usually have much lower source
impedance since the step-up regulator often runs
directly from the output of another regulated supply.
Typically, C
the Typical Applications Circuit . Ensure a low-noise
supply at IN by using adequate C
greater voltage variation can be tolerated on C
decoupled from C
shown in Figure 1.
RIPPLE(C)
I
PEAK
RIPPLE
. The voltage rating and temperature charac-
V
V
IN
I
RIPPLE
IN DCMAX
V
RIPPLE C
I
PEAK
RIPPLE ESR
(
can be reduced below the values used in
is the peak inductor current (see the
=
,
3 6
______________________________________________________________________________________
.
=
2 2
=
( )
IN
(
.
1 45
μ
V
)
.
RIPPLE C
H
V
≈
High-Voltage Level Shifter and Op Amp
using an RC lowpass filter, as
=
IN
×
×
)
C
I
A
MAIN
0 3
≈
(
8 5
2 2
OUT
) reduces the current peaks
.
8 5
Output Capacitor Selection
+
.
I
.
PEAK ESR COUT
.
A
( )
Input Capacitor Selection
V
0 38
V
V
.
×
×
×
⎛
⎜
⎝
2
−
8 5
+
1 2
V
0 8
V
R
2 2
.
A
.
MAIN
V
MAIN OSC
.
.
RIPPLE ESR
V
MHz
≈
V
1 64
≈
)
(
.
IN
f
1 45
−
.
. Alternatively,
≈
V
(
A
IN
0 38
A
.
)
⎞
⎟
⎠
)
A
IN
if IN is
The MAX17010’s high switching frequency demands a
high-speed rectifier. Schottky diodes are recommended
for most applications because of their fast recovery time
and low forward voltage. In general, a 2A Schottky
diode complements the internal MOSFET well.
The output voltage of the main step-up regulator is
adjusted by connecting a resistive voltage-divider from
the output (V
nected to FB (see Figure 1). Select R2 in the 10kΩ to
50kΩ range. Calculate R1 with the following equation:
where V
is 1.235V. Place R1 and R2 close to the IC.
Choose R
gain for fast transient response. Choose C
the integrator zero to maintain loop stability.
For low-ESR output capacitors, use the following equa-
tions to obtain stable performance and good transient
response:
To further optimize transient response, vary R
20% steps and C
transient response waveforms.
An IC’s maximum power dissipation depends on the
thermal resistance from the die to the ambient environ-
ment, and the ambient temperature. The thermal resis-
tance depends on the IC package, PCB copper area,
other thermal mass, and airflow.
The MAX17010, with its exposed backside paddle sol-
dered to an internal ground layer in a typical multilayer
PCB, can dissipate about 2.8W into +70°C still air.
More PCB copper, cooler ambient air, and more airflow
increase the possible dissipation, while less copper or
warmer air decreases the IC’s dissipation capability.
The major components of power dissipation are the
power dissipated in the step-up regulator and the
power dissipated by the op amps.
REF
R
COMP
C
COMP
, the step-up regulator’s feedback set point,
COMP
MAIN
Applications Information
to set the high-frequency integrator
R
≈
COMP
) to AGND with the center tap con-
≈
1
1000
=
10
R
2
×
×
I
in 50% steps, while observing
×
MAIN MAX
L I
V
⎛
⎜
⎝
V
×
OUT
IN
V
V
Output Voltage Selection
MAIN
MAIN MAX
REF
(
×
V
×
Power Dissipation
OUT
C
(
Loop Compensation
−
)
OUT
1
×
⎞
⎟
⎠
R
×
)
COMP
C
Rectifier Diode
OUT
COMP
COMP
to set
15
in