MAX8688ALETG+ Maxim Integrated Products, MAX8688ALETG+ Datasheet - Page 13

• Manufacturer Part Number: MAX8688ALETG+
• Description: IC PWR SUPPLY CTRLR/MONTR 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8688ALETG+

• Applications: Power Supply Controller/Monitor
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 6.7mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

where R
the required change in output voltage, and ∆V
the DACOUT output voltage change that the user
allows. The recommended operating range for the
DACOUT voltage for POL output voltage adjustment is
between 30mV and 2V. It should be noted that ∆V
is the difference between the steady-state POL FB
node voltage, V
This is best illustrated with an example as follows:
Consider an application involving a POL with V
0.6V. Let the desired margining be ±10% for a POL
output voltage of 1V. For a POL with an upper voltage-
divider resistor R
Figure 5. Typical System Application—Feedback Mode
0.1µF
CONTROLLER
SYSTEM
3.3V
1
CLKOUT
is the upper feedback divider resistor, ∆V
R
FB
IRQ
=
FB
10
1
, and the voltage limits on DACOUT.
______________________________________________________________________________________
= 10kΩ, R
k
Ω
Digital Power-Supply Controller/Monitor
A1/SCLE
A2/SDAE
A3/ONOFF
SCL
SDA
RST
FLT
CLKIO
×
( .
0 6
V
FB
0 1
−
.
0 03
V
is calculated as follows:
.
DVDD
DGND
PMBus COMMAND AND
V
STATUS REGISTERS
)
CONTROLLER
=
SMBus
57
k
Ω
POWER MONITOR
MAXQ µC
MAX8688
DAC
FB
DAC
O
INTERNAL REFERENCE
is
is
=
TEMP SENSOR
ADC
DAC
This value of R
POL output voltage up by 10%. It is useful to check the
margin low condition by using the formula:
The effective margining range for the 57kΩ resistor
therefore turns out to be between +10% and -24.5%.
It should be noted that the VOUT_TRANSITION_RATE
parameter has no effect on FB mode. The transition time
for margining in the FB mode of operation is a function of
the MFR_VOUT_CORRECTION_RATE parameter, R
and R
∆
AGND
with PMBus Interface
AVDD
t
V
FB
O
1
, and is given by the following formula:
=
=
R
R
R
1
FB
1
×
S1
200Ω
200Ω
∆
×
V
R
FB
MFR VOUT CORRECTION RATE
DAC
FB
DACOUT
ENOUT
ISN_C
allows the MAX8688 to margin the
RS_C
REFO
ISN+
ISN-
RS+
RS-
_
=
10
k
Ω
R
FB
1µF
0.1µF
_
×
∆
( .
2 0
V
OUT
R
R
57
V
1
2
−
k
FB
EN
0 6
Ω
VO+
.
R
LOAD
SENSE
POL
V
)
=
_
0 245
.
VO-
V
V
IN+
IN-
V
FB
13