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34702 の電気的特性と機能

34702のメーカーはFreescale Semiconductorです、この部品の機能は「Switch-Mode Power Supply」です。


製品の詳細 ( Datasheet PDF )

部品番号 34702
部品説明 Switch-Mode Power Supply
メーカ Freescale Semiconductor
ロゴ Freescale Semiconductor ロゴ 




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34702 Datasheet, 34702 PDF,ピン配置, 機能
www.DFaretaeSshceeatl4eUS.ceommiconductor
Technical Data
3.0 A Switch-Mode Power
Supply with Linear Regulator
The 34702 provides the means to efficiently supply the Freescale
Power QUICC™ I, II, and other families of Freescale
microprocessors and DSPs. The 34702 incorporates a high-
performance switching regulator, providing the direct supply for the
microprocessor’s core, and a low dropout (LDO) linear regulator
control circuit providing the microprocessor I/O and bus voltage.
The switching regulator is a high-efficiency synchronous buck
regulator with integrated N-channel power MOSFETs to provide
protection features and to allow space-efficient, compact design.
The 34702 incorporates many advanced features; e.g., precisely
maintained up/down power sequencing, ensuring the proper
operation and protection of the CPU and power system.
Features
• Operating Voltage from 2.8 V to 6.0 V
• High-Accuracy Output Voltages
• Fast Transient Response
• Switcher Output Current Up to 3.0 A
• Undervoltage Lockout and Overcurrent Protection
• Enable Inputs and Programmable Watchdog Timer
• Voltage Margining via I2C™ Bus
• Reset with Programmable Power-ON Delay
• Pb-Free Packaging Designated by Suffix Code EK
I2C is a trademark of Philips Corporation.
Document Number: MC34702
Rev 6.0, 2/2007
34702
POWER SUPPLY
INTEGRATED CIRCUIT
EK (PB-FREE) SUFFIX
98AARH99137A
32-PIN SOICW
ORDERING INFORMATION
Device
MC34702EK/R2
Temperature
Range (TA)
-40 to 85°C
Package
32 SOICW
Optional
2.8 V to 6.0 V Input
34702
VIN2 VIN1
VBD
VBST
RT
LDRV
CS
LDO
ADDR
SDA
SCL
GND
EN1
EN2
CLKSYN
CLKSEL
FREQ
LFB
RST
BOOT
SW
VOUT
PGND
INV
VDDI
Other
Circuits
Adjustable:
0.8 V to VIN -
Dropout
VDDH (I/Os)
MPC8xxx
VBST
PORESET
Adjustable:
0.8 V to VIN -
Dropout
VDDL (Core)
Figure 1. 34702 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007. All rights reserved.

1 Page





34702 pdf, ピン配列
PIN CONNECTIONS
PIN CONNECTIONS
FREQ
INV
VOUT
VIN2
VIN2
SW
SW
GND
GND
PGND
PGND
VBD
VBST
BOOT
SDA
SCL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32 CLKSYN
31 CLKSEL
30 RST
29 RT
28 EN2
27 EN1
26 ADDR
25 GND
24 GND
23 VDD1
22 VIN1
21 LDRV
20 CS
19 LDO
18 LFB
17 LCMP
Figure 3. Pin Connections
Table 1. Pin Function Description
A functional description of each pin can be found in the Functional Pin Description section beginning on page 16.
Pin Pin Name
Formal Name
Definition
1
FREQ
Oscillator Frequency
This switcher frequency selection pin can be adjusted by connecting external
resistor RF to the FREQ pin. The default switching frequency (FREQ pin left open or
tied to VDDI) is set to 300 kHz.
2 INV
3 VOUT
Inverting Input
Output Voltage
Buck Controller Error Amplifier inverting input.
Output voltage of the buck converter. Input pin of the switching regulator power
sequence control circuit.
4, 5 VIN2
Input Voltage 2
Buck regulator power input. Drain of the high-side power MOSFET.
6, 7 SW
Switch
Buck regulator switching node. This pin is connected to the inductor.
8, 9
24, 25
GND
Ground
Analog ground of the IC, thermal heatsinking.
10, 11
PGND
Power Ground
Buck regulator power ground.
12 VBD
Boost Drain
Drain of the internal boost regulator power MOSFET.
13 VBST
Boost Voltage
Internal boost regulator output voltage. The internal boost regulator provides a
20 mA output current to supply the drive circuits for the integrated power MOSFETs
and the external N-channel power MOSFET of the linear regulator. The voltage at
the VBST pin is 7.75V nominal.
14 BOOT
15 SDA
16 SCL
Bootstrap
Serial Data
Serial Clock
Bootstrap capacitor input.
I2C bus pin. Serial data.
I2C bus pin. Serial clock.
17
LCMP
Linear Compensation Linear regulator compensation pin.
18 LFB
Linear Feedback
Linear regulator feedback pin.
19 LDO
Linear Regulator
Input pin of the linear regulator power sequence control circuit.
Analog Integrated Circuit Device Data
Freescale Semiconductor
34702
3


3Pages


34702 電子部品, 半導体
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings (continued)
All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent
damage to the device.
Rating
Symbol
Value
Unit
THERMAL RATINGS
Storage Temperature
Peak Package Reflow Temperature During Reflow (2), (3)
TSTG
TPPRT
-65 to 150
Note 3
°C
°C
Maximum Junction Temperature
TJMAX
125 °C
Thermal Resistance
Junction to Ambient (Single Layer) (4), (5)
Junction to Ambient (Four Layers) (4), (5)
RθJA
°C/W
70
55
Thermal Resistance, Junction to Base (6)
RθJB
18 °C/W
Operational Package Temperature (Ambient Temperature)
TA
-40 to 85
°C
Notes
2. 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.
3. 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..
4. Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board) temperature,
ambient temperature, air flow, power dissipation of other components on the board and board thermal resistance.
5. Per JEDEC JESD51-6 with the board horizontal
6. Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is measured on the top
surface of the board near the package.
34702
6
Analog Integrated Circuit Device Data
Freescale Semiconductor

6 Page



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共有リンク

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