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MAX8632 Datasheet

  • MAX8632

  • 集成DDR電源方案，適用于臺(tái)式機(jī)、筆記本電腦和圖形卡

  • 29頁(yè)

  • MAXIM   MAXIM

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19-3623; Rev 0; 3/05
IT
TION K
VALUA
E
BLE
AVAILA
Integrated DDR Power-Supply Solution
for Desktops, Notebooks, and Graphic Cards
General Description
Features
Buck Controller
鈾?/div>
Quick-PWM with 100ns Load-Step Response
鈾?/div>
Up to 95% Efficiency
鈾?/div>
2V to 28V Input Voltage Range
鈾?/div>
1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output
鈾?/div>
Up to 600kHz Selectable Switching Frequency
鈾?/div>
Programmable Current Limit with Foldback
Capability
鈾?/div>
1.7ms Digital Soft-Start
鈾?/div>
Independent Shutdown and Standby Controls
鈾?/div>
Overvoltage-/Undervoltage-Protection Option
鈾?/div>
Power-Good Window Comparator
LDO Section
鈾?/div>
Fully Integrated VTT and VTTR Capability
鈾?/div>
VTT Has 鹵3A Sourcing/Sinking Capability
鈾?/div>
Only 20碌F Ceramic Capacitance Required for VTT
鈾?/div>
VTT and VTTR Outputs Track V
REFIN
/ 2
鈾?/div>
All-Ceramic Output-Capacitor Designs
鈾?/div>
1.0V to 2.8V Input Voltage Range
鈾?/div>
Power-Good Window Comparator
MAX8632
The MAX8632 integrates a synchronous-buck PWM con-
troller to generate V
DDQ
, a sourcing and sinking LDO lin-
ear regulator to generate V
TT
, and a 10mA reference
output buffer to generate V
TTR
. The buck controller drives
two external n-channel MOSFETs to generate output volt-
ages down to 0.7V from a 2V to 28V input with output cur-
rents up to 15A. The LDO can sink or source up to 1.5A
continuous and 3A peak current. Both the LDO output
and the 10mA reference buffer output can be made to
track the REFIN voltage. These features make the
MAX8632 ideally suited for DDR memory applications in
desktops, notebooks, and graphic cards.
The PWM controller in the MAX8632 utilizes Maxim鈥檚
proprietary Quick-PWM鈩?architecture with programma-
ble switching frequencies of up to 600kHz. This control
scheme handles wide input/output voltage ratios with
ease and provides 100ns response to load transients
while maintaining high efficiency and a relatively con-
stant switching frequency. The MAX8632 offers fully pro-
grammable UVP/OVP and skip-mode options ideal in
portable applications. Skip mode allows for improved
efficiency at lighter loads.
The VTT and VTTR outputs track to within 1% of V
REFIN
/ 2.
The high bandwidth of this LDO regulator allows excel-
lent transient response without the need for bulk capac-
itors, thus reducing cost and size.
The buck controller and LDO regulators are provided with
independent current limits. Adjustable lossless foldback
current limit for the buck regulator is achieved by monitor-
ing the drain-to-source voltage drop of the low-side
MOSFET. Additionally, overvoltage and undervoltage pro-
tection mechanisms are built in. Once the overcurrent
condition is removed, the regulator is allowed to enter
soft-start again. This helps minimize power dissipation
during a short-circuit condition. The MAX8632 allows flex-
ible sequencing and standby power management using
the
SHDN
and
STBY
inputs, which support all DDR
operating states.
The MAX8632 is available in a small 5mm
脳
5mm, 28-
pin thin QFN package.
Ordering Information
PART
MAX8632ETI+
TEMP RANGE PIN-PACKAGE
-40擄C to +85擄C 28 Thin QFN 5mm
脳
5mm
+Denotes
lead-free packaging.
Pin Configuration
OUT
BST
DL
DH
V
IN
TOP VIEW
21
V
DD
PGND1
GND
20
19
LX
18
17
16
15
14
13
12
REFIN
VTTI
VTT
PGND2
VTTR
VTTS
SS
22
23
24
25
26
27
28
1
TON
FB
SKIP
AV
DD
SHDN
TPO
MAX8632
11
10
9
8
Applications
DDR I and DDR II Memory Power Supplies
Desktop Computers
Notebooks and Desknotes
Graphic Cards
Game Consoles
RAID
Networking
2
OVP/UVP
3
REF
4
ILIM
5
POK1
6
POK2
7
STBY
5mm x 5mm THIN QFN
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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