IC PWR SUPPLY DDR 28-TQFN

MAX8632ETI+

Manufacturer Part NumberMAX8632ETI+
DescriptionIC PWR SUPPLY DDR 28-TQFN
ManufacturerMaxim Integrated Products
MAX8632ETI+ datasheets
 


Specifications of MAX8632ETI+

ApplicationsController, DDRVoltage - Input2 ~ 28 V
Number Of Outputs1Voltage - Output1.8V, 2.5V, 0.7 ~ 5.5 V
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case28-TQFN Exposed PadOutput Voltage1.8 V or 2.5 V or 0.7 V to 5.5 V
Output Current15 AInput Voltage2 V to 28 V
Supply Current25 uASwitching Frequency600 KHz
Mounting StyleSMD/SMTMaximum Operating Temperature+ 85 C
Minimum Operating Temperature- 40 CLead Free Status / RoHS StatusLead free / RoHS Compliant
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19-3623; Rev 1; 10/05
Integrated DDR Power-Supply Solution
for Desktops, Notebooks, and Graphic Cards
General Description
The MAX8632 integrates a synchronous-buck PWM con-
troller to generate V
, a sourcing and sinking LDO lin-
DDQ
ear regulator to generate VTT, and a 10mA reference
output buffer to generate VTTR. The buck controller dri-
ves two external n-channel MOSFETs to generate output
voltages down to 0.7V from a 2V to 28V input with output
currents up to 15A. The LDO can sink or source up to
1.5A continuous and 3A peak current. Both the LDO out-
put 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’s
proprietary Quick-PWM™ 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
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 × 5mm, 28-
pin thin QFN package.
DDR I and DDR II Memory Power Supplies
Desktop Computers
Notebooks and Desknotes
Graphic Cards
Game Consoles
RAID
Networking
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Buck Controller
♦ Quick-PWM with 100ns Load-Step Response
♦ Up to 95% Efficiency
♦ 2V to 28V Input Voltage Range
♦ 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output
♦ Up to 600kHz Selectable Switching Frequency
♦ Programmable Current Limit with Foldback
Capability
♦ 1.7ms Digital Soft-Start
♦ Independent Shutdown and Standby Controls
♦ Overvoltage-/Undervoltage-Protection Option
♦ Power-Good Window Comparator
LDO Section
♦ Fully Integrated VTT and VTTR Capability
♦ VTT Has ±3A Sourcing/Sinking Capability
♦ Only 20µF Ceramic Capacitance Required for VTT
♦ VTT and VTTR Outputs Track V
♦ All-Ceramic Output-Capacitor Designs
♦ 1.0V to 2.8V Input Voltage Range
♦ Power-Good Window Comparator
/ 2.
REFIN
PART
MAX8632ETI+ -40°C to +85°C 28 Thin QFN-EP* 5mm × 5mm
+ Denotes lead-free packaging.
* EP = Exposed pad.
TOP VIEW
Applications
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Features
/ 2
REFIN
Ordering Information
TEMP RANGE PIN-PACKAGE
Pin Configuration
21
20
19
18
17
16
15
22
14
PGND1
13
23
24
12
GND
25
11
MAX8632
10
26
9
27
TPO
28
8
1
2
3
4
5
6
7
5mm x 5mm THIN QFN
REFIN
VTTI
VTT
PGND2
VTTR
VTTS
SS
1