MAX17510ATB+T Maxim Integrated Products, MAX17510ATB+T Datasheet - Page 9

• Manufacturer Part Number: MAX17510ATB+T
• Description: IC REG DDR LOW VOLTAGE 10-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17510ATB+T

• Applications: Converter, DDR
• Voltage - Input: 1.1 ~ 3.6 V
• Number Of Outputs: 1
• Voltage - Output: 0.5 ~ 1.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX1510/MAX17510 feature an open-drain
PGOOD output that transitions high 2ms after the out-
put initially reaches regulation. PGOOD goes low within
10µs of when the output goes out of regulation by
±150mV. The MAX1510/MAX17510 feature current- and
thermal-limiting circuitry to prevent damage during fault
conditions.
The V
the gate drive to the pass transistor. This improves effi-
ciency by allowing V
ply voltage. Power V
supply. Current drawn from the V
atively constant with variations in V
Bypass V
close to the device as possible.
The V
ensures that the regulator starts up with adequate volt-
age for the gate-drive circuitry to bias the internal pass
transistor. The UVLO threshold is 2.55V (typ). V
remain above this level for proper operation.
IN provides the source current for the linear regulator’s
output, OUT. IN connects to the drain of the internal n-
channel power MOSFET. IN can be as low as 1.1V,
minimizing power dissipation. The input UVLO prohibits
operation below 0.8V (typ). Bypass IN with a 10µF or
greater capacitor as close to the device as possible.
The MAX1510/MAX17510 regulate OUTS to the voltage
set at REFIN, making the MAX1510/MAX17510 ideal for
memory applications where the termination supply must
track the supply voltage. Typically, REFIN is set by an
external resistive voltage-divider connected to the
memory supply (V
The maximum output voltage of 1.5V is limited by the
gate-drive voltage of the internal n-channel power
transistor.
REFOUT is a unity-gain transconductance amplifier that
generates the DDR reference supply. It sources and
sinks greater than 5mA. The reference buffer is typically
CC
CC
Buffered Reference Output (REFOUT)
input powers the control circuitry and provides
CC
input undervoltage-lockout (UVLO) circuitry
V
CC
with a 1µF or greater ceramic capacitor as
Undervoltage Lockout (UVLO)
DDQ
_______________________________________________________________________________________
IN
) as shown in Figure 1.
CC
to be powered from a lower sup-
Reference Input (REFIN)
Power-Supply Input (IN)
3.3V Bias Supply (V
from a well-regulated 3.3V
Low-Voltage DDR Linear Regulators
CC
IN
supply remains rel-
and load current.
CC
must
CC
)
connected to ceramic bypass capacitors (0.33µF to
1.0µF). REFOUT is active when V
V
SHDN.
Drive SHDN low to disable the error amplifier, gate-
drive circuitry, and pass transistor (Figure 2). In shut-
down, OUT is terminated to GND with an 8Ω MOSFET.
REFOUT is independent of SHDN. Connect SHDN to
V
The MAX1510/MAX17510 feature source and sink cur-
rent limits to protect the internal n-channel MOSFETs.
The source and sink MOSFETs have a typical 3A cur-
rent limit (1.8A min). This current limit prevents damage
to the internal power transistors, but the device can
enter thermal shutdown if the power dissipation
increases the die temperature above +165°C (see the
Thermal-Overload Protection section).
Soft-start gradually increases the internal source cur-
rent limit to reduce input surge currents at startup. Full-
source current limit is available after the 200µs soft-start
timer has expired. The soft-start current limit is
given by:
where I
Characteristics.
Thermal-overload protection prevents the linear regula-
tor from overheating. When the junction temperature
exceeds +165°C, the linear regulator and reference
buffer are disabled, allowing the device to cool. Normal
operation resumes once the junction temperature cools
by 15°C. Continuous short-circuit conditions result in a
pulsed output until the overload is removed. A continu-
ous thermal-overload condition results in a pulsed out-
put. For continuous operation, do not exceed the
absolute maximum junction-temperature rating
of +150°C.
CC
CC
for normal operation.
is above V
LIMIT
I
LIMIT SS
and t
UVLO
Thermal-Overload Protection
(
. REFOUT is independent of
SS
)
Soft-Start Current Limit
=
are from the Electrical
I
LIMIT
t
SS
×
REFIN
t
Current Limit
> 0.45V and
Shutdown
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