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34702 PDF даташит

Спецификация 34702 изготовлена ​​​​«Freescale Semiconductor» и имеет функцию, называемую «Switch-Mode Power Supply».

Детали детали

Номер произв 34702
Описание Switch-Mode Power Supply
Производители Freescale Semiconductor
логотип Freescale Semiconductor логотип 

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34702 Даташит, Описание, Даташиты
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.









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34702 Даташит, Описание, Даташиты
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VIN1 VIN
VBST
8.0 V
VBST
VDDI
Internal
Supply
VDDI
VBST
VDDI
VBD
EN1
EN2
RST
RT
ADDR
SDA
SCL
Q5 Boost
Control
Reset
Q6 Control
POR
Timer
I2C
Control
I2C
Interface
VREF
Power
Enable
VDDI
VREF
VREF
Bandgap
Voltage
Reference
VDDI
Reset
Power
Sequencing
Voltage Margining
Watchdog Timer
VDDI
VREF
VLDO
Power
Down
VOUT
Linear
To Reset
Control
Regulator
Control
LDRV
CS
LDO
ILim
LFB
Power
Seq
LCMP
Q4
UVLO
VBST
VBST
BOOT
SysCon
INV
LFB
I2C
Control
Thermal
Limit
SysCon
SoftSt
Current Limit
VDDI
Buck
Control
Logic
Buck
HS
and
LS
Driver
VIN2
(2)
Q1
SW
(2)
Q2
Switcher
Oscillator
300 kHz
Ramp
Gen.
PWM
Comp
+
-
Error
Amp
To Reset
+ 0.8 V Control
-
PGND
(2)
INV
VOUT
VOUT
Power
Seq
Q3
CLKSEL CLKSYN FREQ
GND (4)
34702
2
Figure 2. 34702 Simplified Internal Block Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor









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34702 Даташит, Описание, Даташиты
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










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