MAX8794ETB+T Maxim Integrated Products, MAX8794ETB+T Datasheet

IC DDR LINEAR REG 10-TDFN

MAX8794ETB+T

Manufacturer Part Number
MAX8794ETB+T
Description
IC DDR LINEAR REG 10-TDFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8794ETB+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 ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-TDFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
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.
19-0584; Rev 2; 3/10
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.
TOP VIEW
*EXPOSED PAD.
Notebook/Desktop Computers
DDR Memory Termination
Active Termination Buses
Graphics Processor Core Supplies
Chipset/RAM Supplies as Low as 0.5V
REFOUT
PGOOD
AGND
REFIN
V
CC
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
General Description
+
3mm x 3mm
EP*
MAX8794
Pin Configuration
TDFN
Low-Voltage DDR Linear Regulator
IN
Applications
= 1.1V to 3.6V). The
10
9
8
7
6
IN
OUT
PGND
SHDN
OUTS
o Internal Power MOSFETs with Current Limit (3A typ)
o Fast Load-Transient Response
o External Reference Input with Reference
o 1.1V to 3.6V Power Input
o ±15mV (max) Load-Regulation Error
o Thermal-Fault Protection
o Shutdown Input
o Power-Good Window Comparator with 2ms (typ)
o Small, Low-Profile, 10-Pin, 3mm x 3mm TDFN
o Ceramic or Polymer Output Capacitors
+ Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
*EP = Exposed pad.
MAX8794ETB+
MAX8794ETB/V+
Output Buffer
Delay
Package
(2.7V TO 3.6V)
(2.5V OR 1.8V)
PART
V
V
BIAS
DDQ
(1.1V TO 3.6V)
V
IN
Typical Operating Circuit
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
SHDN
IN
V
PGOOD
REFIN
CC
MAX8794
REFOUT
PGND
AGND
OUTS
PIN-
PACKAGE
10 TDFN-EP*
(3mm x 3mm)
10 TDFN-EP*
(3mm x 3mm)
OUT
Features
V
REFOUT
V
= V
OUT
TTR
MARK
= V
ASW
ASW
TOP
TT
1

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MAX8794ETB+T Summary of contents

Page 1

... PGOOD TDFN 3mm x 3mm *EXPOSED PAD. ________________________________________________________________ Maxim Integrated Products 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. o Internal Power MOSFETs with Current Limit (3A typ) o Fast Load-Transient Response o External Reference Input with Reference = 1 ...

Page 2

Low-Voltage DDR Linear Regulator ABSOLUTE MAXIMUM RATINGS IN to PGND............................................................-0.3V to +4.3V OUT to PGND ..............................................-0. OUTS to AGND ............................................-0. AGND.........................................................-0.3V to +4.3V CC REFIN, REFOUT, SHDN, PGOOD to AGND...-0. PGND to ...

Page 3

Low-Voltage DDR Linear Regulator ELECTRICAL CHARACTERISTICS (continued 1.8V 3.3V REFIN OUTS Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL REFERENCE REFIN Voltage Range V REFIN Input Bias ...

Page 4

Low-Voltage DDR Linear Regulator (Circuit of Figure +25°C, unless otherwise noted.) A OUTPUT LOAD REGULATION 0. 0.9V REFIN 0.94 0. 1.25V IN 0.90 0. 1.5V IN 0.86 0. ...

Page 5

Low-Voltage DDR Linear Regulator (Circuit of Figure +25°C, unless otherwise noted.) A REFOUT VOLTAGE ERROR vs. REFOUT LOAD CURRENT -10 -15 -20 - REFOUT LOAD CURRENT (mA) SHUTDOWN WAVEFORM ...

Page 6

Low-Voltage DDR Linear Regulator (Circuit of Figure +25°C, unless otherwise noted.) A DYNAMIC OUTPUT-VOLTAGE TRANSIENT 20.0µs/div SINK CURRENT-LIMIT DISTRIBUTION 50 SAMPLE SIZE = 200 -4.0 -3.5 -3.0 SINK CURRENT LIMIT (A) 6 ...

Page 7

Low-Voltage DDR Linear Regulator PIN NAME Buffered Reference Output. The output of the unity-gain reference input buffer sources and sinks over 1 REFOUT 5mA. Bypass REFOUT to AGND with a 0.33µF or greater ceramic capacitor. Analog Supply Input. Connect to ...

Page 8

Low-Voltage DDR Linear Regulator Detailed Description The MAX8794 is a low-voltage, low-dropout DDR termi- nation linear regulator with an external bias supply input and a buffered reference output (see Figures 1 and 2 powered by a 2.7V to ...

Page 9

Low-Voltage DDR Linear Regulator The MAX8794 features an open-drain PGOOD output that transitions high 2ms after the output initially reach- es regulation. PGOOD goes low within 10µs of when the output goes out of regulation by ±150mV. The MAX8794 features ...

Page 10

Low-Voltage DDR Linear Regulator 200μs SHDN CURRENT LIMIT POWER-GOOD WINDOW OUT 2ms STARTUP DELAY PGOOD Figure 3. MAX8794 PGOOD and Soft-Start Waveforms Power-Good (PGOOD) The MAX8794 provides an open-drain PGOOD output that goes high 2ms (typ) after the output initially ...

Page 11

Low-Voltage DDR Linear Regulator For a step-voltage change at REFIN, the rate of change of the output voltage is limited by the total output capacitance, the current limit, and the load during the transition. Adding a capacitor across REFIN and ...

Page 12

Low-Voltage DDR Linear Regulator Noise, PSRR, and Transient Response The MAX8794 operates with low-dropout voltage and low quiescent current in notebook computers while maintaining good noise, transient response, and AC- rejection specifications. Improved supply-noise rejec- tion and transient response can ...

Page 13

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2010 Maxim Integrated Products ...

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