MAX17000A Maxim Integrated Products, MAX17000A Datasheet - Page 16

• Manufacturer Part Number: MAX17000A
• Description: Complete DDR2 and DDR3 Memory Power-Management Solution
• Manufacturer: Maxim Integrated Products

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Complete DDR2 and DDR3 Memory
Power-Management Solution
Figure 1. MAX17000A Standard Application Circuit
The MAX17000A complete DDR solution comprises a
step-down controller, a source-sink LDO regulator, and a
reference buffer. Maxim’s proprietary Quick-PWM pulse-
width modulator in the MAX17000A is specifically
designed for handling fast load steps while maintaining a
relatively constant operating frequency and inductor
operating point over a wide range of input voltages. The
Quick-PWM architecture circumvents the poor load-tran-
sient timing problems of fixed-frequency current-mode
PWMs, while also avoiding the problems caused by
widely varying switching frequencies in conventional con-
stant-on-time and constant-off-time PWM schemes.
Figure 1 is the MAX17000A standard application circuit
and Figure 2 is the MAX17000A functional diagram.
16
______________________________________________________________________________________
5V V
+5V
+5V
CC
PGND
100kΩ
C
1μF
VDD
R3
Detailed Description
SLP_S3#
ON/OFF
AGND
100kΩ
C
1μF
10Ω
VCC
V
R2
R1
CC
23
21
24
22
10
19
1
2
3
4
OVP
PGOOD1
PGOOD2
V
V
AGND
STDBY
SHDN
SKIP
REFIN
DD
CC
MAX17000A
EP
PGND2
PGND1
VTTS
VTTR
CSH
VTTI
TON
CSL
BST
VTT
DH
DL
LX
FB
14
17
15
16
18
20
13
12
11
9
7
8
5
6
0.1μF
C
The MAX17000A includes a ±2A source-sink LDO reg-
ulator for the memory termination rail. The source-sink
regulator features a dead band that either sources or
sinks, ideal for the fast-changing short-period loads
presenting in memory termination applications. This
feature also reduces the VTT output capacitance
requirement down to 1μF, though load-transient
response can still require higher capacitance values
between 10μF and 20μF.
The reference buffer sources and sinks ±3mA, generating
a reference rail for use in the memory controller and
memory devices.
BST
R
TON
R
R
N
C
0.33μF
FBA
FBB
VTTR
L
N
C
C
H
FB OPTIONS:
1. CONNECT FB TO 5V FOR FIXED +1.8V.
2. CONNECT FB TO GND FOR FIXED +1.5V.
3. USE FB RESISTOR-DIVIDER FOR ADJUSTABLE
VTTI
VTT
7V TO 20V
OUTPUT VOLTAGES.
D1
V
IN
R
VTT = VDDQ/2
VTTR = VDDQ/2
C
+1V TO + 2.5V
EQ
IN
L1
R
R
C
R
DCR
CS
C
EQ
=
= L1 x ( 1 + 1 )
R
C
+1.8V OR 1.5V
EQ
EQ
R
+ R
VDDQ
C
C
R
EQ
R
C
DCR
OUT
R
C