MAX8794_07 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Low-Voltage DDR Linear Regulator

19-0584; Rev 1; 10/07
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Low-Voltage DDR Linear Regulator
General Description
The MAX8794 DDR linear regulator sources and sinks up
to 3A peak (typ) using internal n-channel MOSFETs. This
linear regulator delivers an accurate 0.5V to 1.5V output
from a low-voltage power input (V_IN = 1.1V to 3.6V). The
MAX8794 uses a separate 3.3V bias supply to power the
control circuitry and drive the internal n-channel MOSFETs.
The MAX8794 provides current and thermal limits to pre-
vent damage to the linear regulator. Additionally, the
MAX8794 generates a power-good (PGOOD) signal to
indicate that the output is in regulation. During startup,
PGOOD remains low until the output is in regulation for 2ms
(typ). The internal soft-start limits the input surge current.
The MAX8794 powers the active-DDR termination bus
that requires a tracking input reference. The MAX8794
can also be used in low-power chipsets and graphics
processor cores that require dynamically adjustable
output voltages. The MAX8794 is available in a 10-pin,
3mm x 3mm, TDFN package.
Applications
Notebook/Desktop Computers
DDR Memory Termination
Active Termination Buses
Graphics Processor Core Supplies
Chipset/RAM Supplies as Low as 0.5V
Features
♦ Internal Power MOSFETs with Current Limit (3A typ)
♦ Fast Load-Transient Response
♦ External Reference Input with Reference
Output Buffer
♦ 1.1V to 3.6V Power Input
♦ ±15mV (max) Load-Regulation Error
♦ Thermal-Fault Protection
♦ Shutdown Input
♦ Power-Good Window Comparator with 2ms (typ)
Delay
♦ Small, Low-Profile, 10-Pin, 3mm x 3mm TDFN
Package
♦ Ceramic or Polymer Output Capacitors
Ordering Information
PART
TEMP PIN-
RANGE PACKAGE
TOP
MARK
MAX8794ETB+
-40°C to
+85°C
10 TDFN
(3mm x 3mm)
ASW
+Denotes a lead-free package.
PKG
CODE
T1033-1
Pin Configuration
TOP VIEW
REFOUT 1
V_CC 2
AGND 3
REFIN 4
PGOOD 5
MAX8794
10 IN
9 OUT
8 PGND
7 SHDN
6 OUTS
TDFN
3mm x 3mm
Typical Operating Circuit
V_IN
(1.1V TO 3.6V)
IN
OUT
OUTS
V_OUT = V_TT
V_BIAS
(2.7V TO 3.6V)
V_DDQ
(2.5V OR 1.8V)
MAX8794
V_CC
PGND
SHDN
AGND
PGOOD
REFIN
REFOUT
V_REFOUT = V_TTR
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.