|
|
PDF 34712 Data sheet ( Hoja de datos )
| Número de pieza | 34712 | |
| Descripción | DDR Switch-Mode Power Supply | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de 34712 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
|
No Preview Available !
Freescale Semiconductor
Advance Information
3.0 A 1.0 MHz Fully Integrated
DDR Switch-Mode Power
Supply
Document number: MC34712
Rev. 4.0, 5/2007
34712
The 34712 is a highly integrated, space efficient, low cost, single
synchronous buck switching regulator with integrated N-channel
power MOSFETs. It is a high performance point-of-load (PoL) power
supply with the ability to track an external reference voltage.
Its high efficient 3.0 A sink and source capability combined with its
voltage tracking/sequencing ability and tight output regulation, makes
it ideal to provide the termination voltage (VTT) for modern data buses
such as Double-Data-Rate (DDR) memory buses. It also provides a
buffered output reference voltage (VREF) to the memory chipset
The 34712 offers the designer the flexibility of many control,
supervisory, and protection functions to allow for easy implementation
of complex designs. It is housed in a Pb-Free, thermally enhanced,
and space efficient 24-Pin Exposed Pad QFN.
Features
www.DataSheet4U.com
• 45 mΩ Integrated N-Channel Power MOSFETs
• Input Voltage Operating Range from 3.0 V to 6.0 V
• ±1 % Accurate Output Voltage, Ranging from 0.7 V to 1.35 V
• ±1 % Accurate Buffered Reference Output Voltage
• Programmable Switching Frequency Range from 200 kHz to
1.0 MHz with a default of 1.0 MHz
• Over Current Limit and Short Circuit Protection
• Thermal Shutdown
• Output Overvoltage and Undervoltage Detection
• Active Low Power Good Output Signal
• Active Low Standby and Shutdown Inputs
• Pb-Free Packaging Designated by Suffix Code EP.
VIN
(3.0V TO 6.0V)
VDDQ
34712
PVIN
BOOT
VREFIN
SW
SWITCH-MODE POWER SUPPLY
EP SUFFIX
98ARL10577D
24-PIN QFN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34712EP/R2
-40 to 85°C
24 QFN
TERMINATING
VTT RESISTORS
VIN VOUT
MCU
VDDI
INV
FREQ
GND
COMP
VREFOUT
SD PGND
STBY
PG
VIN
VDDQ
MEMORY
BUS
DDR MEMORY
CHIPSET
VREF
VDDQ
DDR MEMORY
CONTROLER
Figure 1. 34712 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
1 page  
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings
All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or
permanent damage to the device.
Ratings
Symbol
Value
Unit
ELECTRICAL RATINGS
Input Supply Voltage (VIN) Pin
High-Side MOSFET Drain Voltage (PVIN) Pin
Switching Node (SW) Pin
BOOT Pin (Referenced to SW Pin)
PG, VOUT, SD, and STBY Pins
VIN
PVIN
VSW
VBOOT - VSW
-
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 7.5
-0.3 to 7.5
-0.3 to 7.0
V
V
V
V
V
VDDI, FREQ, INV, COMP, VREFIN, and VREFOUT Pins
Continuous Output Current (1)
ESD Voltage (2)
Human Body Model
Device Charge Model (CDM)
THERMAL RATINGS
Operating Ambient Temperature (3)
Storage Temperature
Peak Package Reflow Temperature During Reflow (4), (5)
Maximum Junction Temperature
Power Dissipation (TA = 85 °C) (6)
-
IOUT
VESD1
VESD3
TA
TSTG
TPPRT
TJ(MAX)
PD
-0.3 to 3.0
±3.0
±2000
±750
-40 to 85
-65 to +150
Note 5
+150
2.9
V
A
V
°C
°C
°C
°C
W
Notes
1. Continuous output current capability so long as TJ is ≤ TJ(MAX).
2. ESD1 testing is performed in accordance with the Human Body Model (CZAP=100 pF, RZAP=1500 Ω), ESD3 testing is performed in
accordance with the Charge Device Model (CDM).
3. The limiting factor is junction temperature, taking into account power dissipation, thermal resistance, and heatsinking.
4. Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
5. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow
Temperature and Moisture Sensitivity Levels (MSL),
Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes and enter the core ID to view all orderable parts. (i.e.
MC33xxxD enter 33xxx), and review parametrics.
6. Maximum power dissipation at indicated ambient temperature.
Analog Integrated Circuit Device Data
Freescale Semiconductor
34712
5
5 Page 
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
INTERNAL SUPPLY VOLTAGE OUTPUT (VDDI)
This is the output of the internal bias voltage regulator.
Connect a 1.0 µF, 6 V low ESR ceramic filter capacitor
between this pin and the GND pin. Filtering any spikes on this
output is essential to the internal circuitry stable operation.
OUTPUT VOLTAGE DISCHARGE PATH (VOUT)
Output voltage of the Buck Converter is connected to this
pin. it only serves as the output discharge path once the SD
signal is asserted.
ERROR AMPLIFIER INVERTING INPUT (INV)
Buck converter error amplifier inverting input. Connect the
VTT voltage directly to this pin.
COMPENSATION INPUT (COMP)
Buck converter external compensation network connects
to this pin. Use a type III compensation network.
INPUT SUPPLY VOLTAGE (VIN)
IC power supply input voltage. Input filtering is required for
the device to operate properly.
POWER GROUND (PGND)
Buck converter and discharge MOSFETs power ground. It
is the source of the buck converter low-side power MOSFET.
SWITCHING NODE (SW)
Buck converter switching node. This pin is connected to
the output inductor.
POWER INPUT VOLTAGE (PVIN)
Buck converter power input voltage. This is the drain of the
buck converter high-side power MOSFET.
BOOTSTRAP INPUT (BOOT)
Bootstrap capacitor input pin. Connect a capacitor (as
discussed on page 19) between this pin and the SW pin to
enhance the gate of the high-side Power MOSFET during
switching.
SHUTDOWN INPUT (SD)
If this pin is tied to the GND pin, the device will be in
Shutdown Mode. If left unconnected or tied to the VIN pin, the
device will be in Normal Mode. The pin has an internal pull up
of 1.5 MΩ. This input accepts the S5 (Suspend-To-Disk)
control signal.
STANDBY INPUT (STBY)
If this pin is tied to the GND pin, the device will be in
Standby Mode. If left unconnected or tied to the VIN pin, the
device will be in Normal Mode. The pin has an internal pull up
of 1.5 MΩ. This input accepts the S3 (Suspend-To-RAM)
control signal.
POWER GOOD OUTPUT SIGNAL (PG)
This is an active low open drain output that is used to
report the status of the device to a host. This output activates
after a successful power up sequence and stays active as
long as the device is in normal operation and is not
experiencing any faults. This output activates after a 10 ms
delay and must be pulled up by an external resistor to a
supply voltage (e.g.,VIN.).
Analog Integrated Circuit Device Data
Freescale Semiconductor
34712
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet 34712.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 34710 | Adjustable Dual Output Switching Power Supply |  Motorola Inc |
| 34712 | DDR Switch-Mode Power Supply | Freescale Semiconductor |
| 34713 | Single Switch-Mode Power Supply | Freescale Semiconductor |
| 34716 | Dual Switch-Mode DDR Power Supply | Freescale Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |