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MAX17000

Description
Complete DDR2 and DDR3 Memory Power-Management Solution
File Size779KB,32 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX17000 Overview

Complete DDR2 and DDR3 Memory Power-Management Solution

EVALUATION KIT AVAILABLE
MAX17000
Complete DDR2 and DDR3 Memory
Power-Management Solution
General Description
The MAX17000 pulse-width modulation (PWM) con-
troller provides a complete power solution for notebook
DDR, DDR2, and DDR3 memory. It comprises a step-
down controller, a source/sink LDO regulator, and a ref-
erence buffer to generate the required VDDQ, VTT, and
VTTR rails.
The VDDQ rail is supplied by a step-down converter
using Maxim’s proprietary Quick-PWM™ controller. The
high-efficiency, constant-on-time PWM controller han-
dles wide input/output voltage ratios (low duty-cycle
applications) with ease and provides 100ns response
to load transients while maintaining a relatively constant
switching frequency. The Quick-PWM architecture cir-
cumvents the poor load-transient timing problems of
fixed-frequency current-mode PWMs while also avoid-
ing the problems caused by widely varying switching
frequencies in conventional constant-on-time and con-
stant-off-time PWM schemes. The controller senses the
current to achieve an accurate valley current-limit pro-
tection. It is also built in with overvoltage, undervoltage,
and thermal protections. The MAX17000 can be set to
run in three different modes: power-efficient SKIP
mode, low-noise forced-PWM mode, and standby
mode to support memory in notebook computer stand-
by operation. The switching frequency is programma-
ble from 200kHz to 600kHz to allow small components
and high efficiency. The VDDQ output voltage can be
set to a preset 1.8V or 1.5V, or be adjusted from 1.0V to
2.5V by an external resistor-divider. This output has 1%
accuracy over line-and-load operating range.
The MAX17000 includes a ±2A source/sink LDO regu-
lator for the memory termination VTT rail. This VTT regu-
lator has a ±5mV deadband that either sources or
sinks, ideal for the fast-changing load burst present in
memory termination applications. This feature also
reduces output capacitance requirements.
The VTTR reference buffer sources and sinks ±3mA,
providing the reference voltage needed by the memory
controller and devices on the memory bus.
The MAX17000 is available in a 24-pin, 4mm x 4mm,
TQFN package.
Features
o
SMPS Regulator (VDDQ)
Quick-PWM with 100ns Load-Step Response
Output Voltages—Preset 1.8V, 1.5V, or
Adjustable 1.0V to 2.5V
1% V
OUT
Accuracy Over Line and Load
26V Maximum Input Voltage Rating
Accurate Valley Current-Limit Protection
200kHz to 600kHz Switching Frequency
o
Source/Sink Linear Regulator (VTT)
±2A Peak Source/Sink
Low-Output Capacitance Requirement
Output Voltages-Preset VDDQ/2 or REFIN
Adjustable from 0.5V to 1.5V
o
Low Quiescent Current Standby State
o
Soft-Start/Soft-Shutdown
o
SMPS Power-Good Window Comparator
o
VTT Power-Good Window Comparator
o
Selectable Overvoltage Protection
o
Undervoltage/Thermal Protections
o
±3mA Reference Buffer (VTTR)
Ordering Information
PART
MAX17000ETG+
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
24 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
CSH
13
12
11
10
CSL
FB
REFIN
VTTI
VTT
PGND2
9
8
7
1
OVP
2
PGOOD1
3
PGOOD2
4
STDBY
5
VTTS
6
VTTR
TON
14
BST
TOP VIEW
DL
18
V
DD
19
PGND1 20
AGND 21
17
16
15
MAX17000ETG+
SKIP 22
V
CC
23
SHDN 24
Applications
Notebook Computers
DDR, DDR2, and DDR3 Memory Supplies
SSTL Memory Supplies
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
TQFN
4mm x 4mm
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
DH
LX
19-4125; Rev 2; 4/13

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