19-0584; Rev 1; 10/07
Low-Voltage DDR Linear Regulator
General Description
Features
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
♦ 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
from a low-voltage power input (V = 1.1V to 3.6V). The
IN
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.
♦
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
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.
♦ Ceramic or Polymer Output Capacitors
Applications
Ordering Information
Notebook/Desktop Computers
TEMP PIN-
RANGE PACKAGE
TOP
MARK
PKG
CODE
PART
DDR Memory Termination
Active Termination Buses
-40°C to 10 TDFN
+85°C (3mm x 3mm)
MAX8794ETB+
ASW
T1033-1
Graphics Processor Core Supplies
Chipset/RAM Supplies as Low as 0.5V
+Denotes a lead-free package.
Pin Configuration
Typical Operating Circuit
V
IN
(1.1V TO 3.6V)
V
= V
TT
OUT
IN
OUT
TOP VIEW
OUTS
V
BIAS
1
2
3
4
5
10
9
MAX8794
REFOUT
IN
(2.7V TO 3.6V)
V
OUT
V
PGND
AGND
CC
CC
8
AGND
REFIN
PGND
SHDN
OUTS
SHDN
MAX8794
7
PGOOD
REFIN
6
PGOOD
V
DDQ
(2.5V OR 1.8V)
V
= V
TTR
REFOUT
REFOUT
TDFN
3mm x 3mm
________________________________________________________________ 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.