MAX17000AETG+ Maxim Integrated Products, MAX17000AETG+ Datasheet - Page 16

• Manufacturer Part Number: MAX17000AETG+
• Description: IC PWM CTLR DDR/DDR2/DDR3 24TQFN
• Manufacturer: Maxim Integrated Products
• Series: Quick-PWM™r

Specifications of MAX17000AETG+

• Applications: Memory, DDR2/DDR3 Regulator
• Current - Supply: 2mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Complete DDR2 and DDR3 Memory
Power-Management Solution
Figure 1. MAX17000 Standard Application Circuit
The MAX17000 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 MAX17000 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 MAX17000 standard application circuit
and Figure 2 is the MAX17000 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
AGND
DD
CC
MAX17000
EP
PGND2
PGND1
PGND
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
PGND
0.1µF
C
BST
The MAX17000 includes a ±2A source/sink LDO regu-
lator 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.
R
TON
R
R
AGND
AGND
N
C
0.33µF
FBA
FBB
VTTR
L
N
PGND
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
L1
VTT = VDDQ/2
VTTR = VDDQ/2
C
+1V TO + 2.5V
PGND
IN
R
SENSE
+1.8V OR 1.5V
C
PGND
VDDQ
OUT