MAX8632ETI+ Maxim Integrated Products, MAX8632ETI+ Datasheet
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MAX8632ETI+
Manufacturer Part Number
MAX8632ETI+
Description
IC PWR SUPPLY DDR 28-TQFN
Manufacturer
Maxim Integrated Products
Specifications of MAX8632ETI+
Applications
Controller, DDR
Voltage - Input
2 ~ 28 V
Number Of Outputs
1
Voltage - Output
1.8V, 2.5V, 0.7 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Output Voltage
1.8 V or 2.5 V or 0.7 V to 5.5 V
Output Current
15 A
Input Voltage
2 V to 28 V
Supply Current
25 uA
Switching Frequency
600 KHz
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8632 integrates a synchronous-buck PWM con-
troller to generate V
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.
19-3623; Rev 1; 10/05
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.
DDR I and DDR II Memory Power Supplies
Desktop Computers
Notebooks and Desknotes
Graphic Cards
Game Consoles
RAID
Networking
for Desktops, Notebooks, and Graphic Cards
________________________________________________________________ Maxim Integrated Products
DDQ
, a sourcing and sinking LDO lin-
General Description
Integrated DDR Power-Supply Solution
Applications
REFIN
/ 2.
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
♦ 1.7ms Digital Soft-Start
♦ Independent Shutdown and Standby Controls
♦ Overvoltage-/Undervoltage-Protection Option
♦ Power-Good Window Comparator
♦ 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
+ Denotes lead-free packaging.
* EP = Exposed pad.
MAX8632ETI+ -40°C to +85°C 28 Thin QFN-EP* 5mm × 5mm
Typical Operating Circuit appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Capability
LDO Section
TOP VIEW
PART
PGND1
GND
TPO
25
26
27
28
22
23
24
TEMP RANGE PIN-PACKAGE
21
1
5mm x 5mm THIN QFN
20
2
Ordering Information
19
3
MAX8632
18
4
Pin Configuration
17
5
16
6
REFIN
15
7
14
13
12
11
10
9
8
Features
/ 2
VTT
REFIN
VTTI
PGND2
VTTR
VTTS
SS
1