MAX17510 データシートの表示（PDF） - Maxim Integrated
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MAX17510 Datasheet PDF : 13 Pages
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MAX1510/MAX17510
Low-Voltage DDR Linear Regulators
Pin Description
PIN
NAME
FUNCTION
1
REFOUT
Buffered Reference Output. The output of the unity-gain reference input buffer sources and sinks over
5mA. Bypass REFOUT to AGND with a 0.33µF or greater ceramic capacitor.
2
VCC
Analog Supply Input. Connect to the system supply voltage (+3.3V). Bypass VCC to AGND with a 1µF or
greater ceramic capacitor.
3
AGND Analog Ground. Connect the backside pad to AGND.
4
REFIN External Reference Input. REFIN sets the output regulation voltage (VOUTS = VREFIN).
Open-Drain Power-Good Output. PGOOD is low when the output voltage is more than 150mV (typ) above
5
PGOOD or below the regulation point, during soft-start, and when shut down. 2ms after the output reaches the
regulation voltage during startup, PGOOD becomes high impedance.
6
OUTS
Output Sense Input. The OUTS regulation level is set by the voltage at REFIN. Connect OUTS to the
remote DDR termination bypass capacitors. OUTS is internally connected to OUT through a 12kΩ resistor.
7
SHDN
Shutdown Control Input. Connect to VCC for normal operation. Connect to analog ground to shut down the
linear regulator. The reference buffer remains active in shutdown.
8
PGND Power Ground. Internally connected to the output sink MOSFET.
9
OUT
Output of the Linear Regulator
10
IN
Power Input. Internally connected to the output source MOSFET.
—
EP
Exposed Pad. Internally connected to AGND. Connect EP to AGND PCB ground plane to maximize
thermal performance. Not intended as an electrical connection point.
Detailed Description
The MAX1510/MAX17510 are low-voltage, low-dropout
DDR termination linear regulators with an external bias
supply input and a buffered reference output (see Figures
1 and 2). VCC is powered by a 2.7V to 3.6V supply that
is commonly available in laptop and desktop computers.
The 3.3V bias supply drives the gate of the internal pass
transistor, while a lower voltage input at the drain of the
transistor (IN) is regulated to provide VOUT. By using sep-
arate bias and power inputs, the MAX1510/MAX17510
can drive an n-channel high-side MOSFET and use a
lower input voltage to provide better efficiency.
The MAX1510/MAX17510 regulate their output voltage
to the voltage at REFIN. When used in DDR applica-
tions as a termination supply, the MAX1510/MAX17510
deliver 1.25V or 0.9V at 3A peak (typ) from an input volt-
age of 1.1V to 3.6V. The MAX1510/MAX17510 sink up
to 3A peak (typ) as required in a termination supply. The
MAX1510/MAX17510 provide shoot-through protection,
ensuring that the source and sink MOSFETs do not con-
duct at the same time, yet produce a fast source-to-sink
load transient.
VIN =
1.1V TO 3.6V
CIN2
10µF
3.3V BIAS
SUPPLY
R3
100kΩ
POWER-GOOD
C1
1.0µF
ON
OFF
R1
10kΩ
VDDQ
R2
10kΩ
CREFIN
1000pF
VOUT = VTT = VDDQ/2
IN
OUT
MAX1510
MAX17510
COUT1
100µF
VCC
PGOOD
SHDN
PGND
AGND
OUTS
REFIN
REFOUT
VREFOUT = VTTR
CREFOUT
0.33µF
Figure 1. Standard Application Circuit
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