MAX17019EVKIT+ Maxim Integrated, MAX17019EVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX17019EVKIT+
• Description: Power Management IC Development Tools Maxim Evaluation Kit
• Manufacturer: Maxim Integrated
• Series: MAX17019r

MAX17019 Evaluation Kit
The MAX17019 output rails incorporate undervoltage
shutoff and stay off until the corresponding ON_ switch
is toggled. Make sure the supplies to the rails are high
enough to allow it to regulate. Also check if the current
limit on the power supply is set high enough for the initial
startup current spike.
The current capability listed in the data sheet is the peak
ripple current. DC current may be 30% lower. If the sup-
ply rails are cascaded, allow for lower external load cur-
rents. Also check the current limit on the power supply.
The control algorithm in the MAX17019 utilizes a load-
line architecture. This architecture improves stability and
step response at the cost of a weaker load response.
It may be necessary to set the output voltage higher to
fulfill accuracy requirements.
The MAX17019 EV kit is shipped with FBA connected
to resistors R5 and R6, which sets the VOUTA voltage
to 5V.
To change the output voltage to a value between 1V
and 5.5V, remove R5. Calculate R5 using the following
equation:
where V
age of 1V, place a short across R5 and leave R6 open.
The MAX17019 EV kit is shipped with FBB connected
to resistors R7 and R8, which sets the VOUTB voltage
to 3.3V.
To change the output voltage to a value between 0.75V
and 4V, remove R7. Calculate R7 using the following
equation:
where V
voltage of 0.75V, place a short across R7 and leave R8
open.
4
Detailed Description of Hardware
______________________________________________________________________________________
FBA
FBB
3.3V Output-Voltage Setting (VOUTB)
5V Output-Voltage Setting (VOUTA)
= 1V and R6 =10kI Q1%. For an output volt-
= 0.75V and R8 =10kI Q1%. For an output
R5 R6 x
R7 R8 x
Current Capability Seems Too Low
=
=
Output Rails Do Not Come Up
Load Regulation Seems Low






V
V
V
V
OUTA
OUTB
FBA
FBB
Troubleshooting
− 
− 
1
1




The MAX17019 EV kit is shipped with FBC connected to
resistors R9 and R10, which sets the VOUTC voltage to
1.2V.
To change the output voltage to a value between 0.75V
and 4V, remove R9. Calculate R9 using the following
equation:
where V
voltage of 0.75V, place a short across R9 and leave R10
open.
The MAX17019 EV kit is shipped with FBD connected to
resistors R22 and R23, which sets the VOUTD voltage
to 2.5V. The voltage at FBD tracks the REFIND voltage,
which is pulled up to the 1.25V reference output voltage
VREF through resistor R33.
To change the VOUTD output voltage to a value between
0.5V and V
lowing equation:
where V
Make sure the internal losses P
I
the MAX17019 IC data sheet).
Separate enable inputs and independent open-drain
power-good outputs allow flexible power sequencing.
Switch SW1 is provided to control the ONA–OND enable
inputs and the SHDN input. Table 1 summarizes SW1’s
function.
To display which of the outputs are in regulation, power-
good LED indicators D2–D5 are also provided.
OUTD
do not violate the thermal limits of the IC (refer to
FBC
FBD
1.2V Output-Voltage Setting (VOUTC)
2.5V Output-Voltage Setting (VOUTD)
IND
= 0.75V and R10 =10kI Q1%. For an output
= V
, remove R22. Calculate R22 using the fol-
R22 R23 x
REFIND
Independent Enable Inputs and
R9 R10 x
=
=
= 1.25V and R23 =10kI Q1%.






V
V
V
OUTC
Power-Good Outputs
V
FBC
OUTD
REGD
FBD
− 
− 
= (V
1
1




IND
- V
OUTD
) x