IC PWR SUPPLY DDR 28-TQFN

MAX8632ETI+T

Manufacturer Part NumberMAX8632ETI+T
DescriptionIC PWR SUPPLY DDR 28-TQFN
ManufacturerMaxim Integrated Products
MAX8632ETI+T datasheet
 


Specifications of MAX8632ETI+T

ApplicationsController, DDRVoltage - Input2 ~ 28 V
Number Of Outputs1Voltage - Output1.8V, 2.5V, 0.7 ~ 5.5 V
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case28-TQFN Exposed PadOutput Voltage1.8 V, 2.5 V, 0.7 V to 5.5 V
Output Current15 AInput Voltage2 V to 28 V
Mounting StyleSMD/SMTMaximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 CLead Free Status / RoHS StatusLead free / RoHS Compliant
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Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
PIN
NAME
On-Time Selection-Control Input. This four-level logic input sets the nominal DH on-time. Connect to
GND, REF, AV
TON = AV
(200kHz)
DD
1
TON
TON = open (300kHz)
TON = REF (450kHz)
TON = GND (600kHz)
Overvoltage-/Undervoltage-Protection Control Input. This four-level logic input enables or disables the
overvoltage and/or undervoltage protection. The overvoltage limit is 116% of the nominal output
voltage. The undervoltage limit is 70% of the nominal output voltage. Discharge mode is enabled when
OVP/
OVP is also enabled. Connect the OVP/UVP pin to the following pins for the desired function:
2
UVP
OVP/UVP = AV
OVP/UVP = open (Enable OVP and discharge mode, disable UVP.)
OVP/UVP = REF (Disable OVP and discharge mode, enable UVP.)
OVP/UVP = GND (Disable OVP and discharge mode, disable UVP.)
+2.0V Reference Voltage Output. Bypass to GND with a 0.1µF (min) capacitor. REF can supply 50µA
for external loads. Can be used for setting voltage for ILIM. REF turns off when SHDN is low and
3
REF
OUT < 0.1V.
Valley Current-Limit Threshold Adjustment for Buck Regulator. The current-limit threshold across PGND
and LX is 0.1 times the voltage at ILIM. Connect ILIM to a resistive divider, typically from REF to GND,
4
ILIM
to set the current-limit threshold between 25mV and 200mV. This corresponds to a 0.25V to 2V range at
ILIM. Connect ILIM to AV
Current Limit (Buck) section.
Buck Power-Good Open-Drain Output. POK1 is low when the buck output voltage is more than 10%
5
POK1
above or below the normal regulation point or during soft-start. POK1 is high impedance when the
output is in regulation and the soft-start circuit has terminated. POK1 is low in shutdown.
LDO Power-Good Open-Drain Output. In normal mode, POK2 is low when either VTTR or VTTS is more
6
POK2
than 10% above or below the normal regulation point, which is typically REFIN / 2. In standby mode,
POK2 responds only to the VTTR input. POK2 is low in shutdown, and when V
Standby. Connect to GND for low-quiescent mode where the VTT output is open circuit. POK2 takes
STBY
7
input from only VTTR in this mode. PWM output can be on or off, depending on the state of SHDN.
Soft-Start Control for VTT. Connect a capacitor (C9 in Figure 8) from SS to ground. Leave SS open to
8
SS
disable soft-start. SS discharges to ground when VTT is off. See the POR, UVLO, and Soft-Start section.
Sensing Pin for Termination Supply Output. Normally connected to VTT pin to allow accurate regulation
9
VTTS
to half the REFIN voltage. Connected to a resistive divider from VTT to GND to regulate VTT to higher
than half the REFIN voltage.
10
VTTR
Termination Reference Voltage. VTTR tracks V
_______________________________________________________________________________________
FUNCTION
, or leave TON unconnected to select the following nominal switching frequencies:
DD
(Enable OVP and discharge mode, enable UVP.)
DD
to select the 50mV default current-limit threshold. See the Setting the
DD
/ 2.
REFIN
Pin Description
is less than 0.8V.
REFIN
9