FREESCALE PC33710EW

Freescale Semiconductor
Technical Data
MC34710
Rev. 3.0, 3/2006
Document order number:
Dual Output DC-DC & Linear
Regulator IC
The 34710 is a dual-output power regulator IC integrating
switching regulator, linear regulator, supervisory and power supply
sequencing circuitry. With a wide operating input voltage range of
13 V to 32 V, the 34710 is applicable to many commercial and
industrial applications using embedded MCUs.
33710
34710
DUAL OUTPUT DC-DC & LINEAR
REGULATOR
A mode-selected 5.0 V or 3.3 V DC-DC switching regulator is
provided for board-level I/O and user circuitry up to 700 mA. A linear
regulator provides mode-selected core supply voltages of either 3.3V,
2.5V, 1.8V, or 1.5V at currents up to 500 mA.
The supervisor circuitry ensures that the regulator outputs follow a
predetermined power-up and power-down sequence.
Features
• Efficient 5.0 V / 3.3 V Buck Regulator
• Low Noise LDO Regulator (mode-selected 3.3V, 2.5V,1.8V, or
1.5V)
• On-Chip Thermal Shutdown Circuitry
• Supervisory Functions (Power-ON Reset and Error Reset
Circuitry)
• Sequenced I/O and Core Voltages
• Pb-Free Packaging Designated by Suffix Code EW
DW SUFFIX
EW SUFFIX (PB-FREE)
98ASA10627D
32-TERMINAL SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
*PC33710EW / R2
-40°C to 105°
32 SOICW-EP
MC34710EW/R2
0°C to 85°C
32 SOICW-EP
*Device in development.
Electrical parameters being defined.
VI/O
13 V to 32 V
34710
B+
VB
CT
VSWITCH
CP2
VI/O
VFB
CP1
MCU
MODE0
MODE1
MODE2
RST
LINB+
VCORE
GND
VCORE
Figure 1. 34710 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., 2006. All rights reserved.
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
B+
200 kHz
Oscillator
CP1
CP2
Charge
Pump
VB
Supervisory and
Temperature
Shutdown
RST
CT
Bandgap
MODE0
MODE1
MODE2
LINB+
VI/O
Switching
Regulator
VFB
VSWITCH
VCORE
Linear
Regulator
VCORE
GND
Figure 2. 34710 Simplified Internal Block Diagram
34710
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Analog Integrated Circuit Device Data
Freescale Semiconductor
TERMINAL CONNECTIONS
TERMINAL CONNECTIONS
RST
MODE0
MODE1
MODE2
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
GND
N/C
N/C
N/C
1
32
2
31
3
30
4
29
5
28
6
27
7
26
8
25
9
24
10
23
11
22
12
21
13
20
14
19
15
18
16
17
CT
CP1
CP2
VB
B+
VSWITCH
VFB
LINB+
N/C
VCORE
N/C
N/C
N/C
N/C
N/C
N/C
Figure 3. 34710 Terminal Connections
Table 1. 34710 Terminal Definitions
Terminal
Number
Terminal
Name
Terminal
Function
Formal Name
1
RST
Reset
Reset
2
3
4
Mode0
Mode1
Mode2
Input
Mode Control
These input terminals control VFB and VCORE output voltages.
5 – 12,
14 –22, 24
NC
NC
No Connects
No internal connection to this terminal.
13
GND
Ground
Ground
23
VCORE
Output
Core Voltage
Regulator Output
25
LINB+
Input
Core Voltage
Regulator Input
Core regulator input voltage.
26
VFB
Input
VI/O Switching
Regulator
Feedback
Feedback terminal for VI/O switching regulator and internal logic supply.
27
VSWITCH
Output
VI/O Switching
Regulator Switch
Output
28
B+
Input
Power Supply
Input
Regulator input voltage.
29
VB
Output
Boost Voltage
Boost voltage storage node.
30
CP2
Passive
Component
CP Capacitor
Positive
Charge pump capacitor connection 2.
31
CP1
Passive
Component
CP Capacitor
Negative
Charge pump capacitor connection 1.
32
CT
Passive
Component
Reset Delay
Capacitor
Reset delay adjustment capacitor.
Definition
Reset is an open drain output only.
Ground.
Core regulator output voltage.
VI/O switching regulator switching output.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
3
MAXIMUM RATINGS
MAXIMUM RATINGS
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.
Rating
Symbol
Max
Unit
ELECTRICAL RATINGS
VB+
Input Power Supply Voltage
V
-0.3 to 36
IB+ = 0.0 A
Terminal Soldering Temperature (1)
Power Dissipation (2)
TSOLDER
260
°C
PD
3.0
W
VESD1
±2000
RθJA
45
V
ESD Standoff Voltage
Non-Operating, Unbiased, Human Body Model
(3)
°C/W
Thermal Resistance
Junction-to-Ambient
(4)
RθJA
25
RθJC
2.0
Operating Ambient Temperature
TA
0 to 85
°C
Operating Junction Temperature
TJ
0 to 105
°C
Junction-to-Ambient (2)
Junction-to-Exposed-Pad
THERMAL RATINGS
VB+
Input Power Supply Voltage
V
13 to 32
IB+ = 0.0 A to 3.0 A
IB+(Q)
Quiescent Bias Current from B+ (5)
mA
7.5
VB+ = 13 V to 32 V
VI /O SWITCHING REGULATOR (6)
Maximum Output Voltage Startup Overshoot (COUT = 330 µF)
VI / O(STARTUP)
Mode0 = 0
3.6
Mode0 = Open
Maximum Output Current
TA = 0°C to 105°C
V
5.4
IVI/O
mA
700
Notes
1. 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.
2.
3.
With 2.0 in2 of copper heatsink.
ESD1 testing is performed in accordance with the Human Body Model (CZAP = 100 pF, RZAP = 1500 Ω).
4.
5.
6.
With no additional heatsinking.
Maximum quiescent power dissipation is 0.25 W.
13 V ≤ VB+ ≤ 32 V and - 20°C ≤ TJ ≤ 145°C unless otherwise noted.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
MAXIMUM RATINGS
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
Max
Unit
VCORE LINEAR REGULATOR (7)
Maximum Output Voltage Startup Overshoot (COUT = 10 µF) (8)
VCORE (STARTUP)
Mode2=Low, Mode1=Low, Mode0=Low
2.7
Mode2=Open, Mode1=Low, Mode0=Don’t Care
2.0
Mode2=Low, Mode1=Open, Mode0=Don’t Care
1.65
Mode2=Open, Mode1=Open, Mode0=Don’t Care
Maximum Output Current
TJ = 0°C to 105°C, VLINB+ ≤ VCORE (NOM) + 0.8 V (9)
V
3.6
IVCORE
mA
500
Notes
7. 13 V ≤ VB+ ≤ 32 V and - 20°C ≤ TJ ≤ 145°C unless otherwise noted.
8.
9.
Refer to Table 2, page 9.
Pulse testing with low duty cycle used.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
5
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 4.75 V ≤ VIO ≤ 5.25 V, 13 V ≤ VB+ ≤ 32 V, and 0°C ≤ TJ ≤ 105°C unless otherwise noted.
Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
4.8
5.0
5.2
3.15
3.25
3.45
Unit
SWITCHING REGULATOR (VI/O, MODE0)
Logic Supply Voltage (IVI/O = 25 to 700 mA)
VI / O
Mode0 = 0
Mode0 = Open (floating)
Output On Resistance
RDS(ON)
Ω
0.5
VB+ = 13 V to 32 V
Soft Start Threshold Voltage
V
1.0
2.0
VI / O(SOFT)
V
–
2.5
3.1
ILIMIT (OP)
1.9
2.4
2.9
ILIMIT (SOFT)
1.0
–
1.9
-0.5
–
–
3.15
3.3
3.45
2.45
2.5
2.75
1.7
1.8
2.05
1.425
1.5
1.575
3.0
–
3.4
2.2
–
2.6
Mode2=Open, Mode1=Don’t Care, Mode0=Low
1.55
–
1.9
Mode2=Open, Mode1=Don’t Care, Mode0=Open
1.33
–
1.53
–
0.5
0.8
Mode0 = any
Current Limit Threshold (TJ = 25°C to 100°C)
Normal Operation
Soft Start, VI / O ≤ 2.5 V
Minimum Voltage Allowable on VSWITCH Terminal
A
VVSWITCH (MIN)
TJ = 25°C to 100°C
V
LINEAR REGULATOR (VCORE, MODE 1, 2, 3, 4)
Supply Voltage (IVCORE = 5.0 mA) (10)
VCORE (NOM)
Mode2=Low, Mode1=Don’t Care, Mode0=Low
Mode2=Low, Mode1=Don’t Care, Mode0=Open
Mode2=Open, Mode1=Don’t Care, Mode0=Low
Mode2=Open, Mode1=Don’t Care, Mode0=Open
Supply Voltage (IVCORE = 500 mA) (10)
Mode2=Low, Mode1=Don’t Care, Mode0=Open
IVCORE(DROPOUT)
VCORE = VCORE (NOM), IVCORE = 0.5 A
Normal Current Limit Threshold
TJ = 25°C to 100°C, VLINB+ = VCORE (NOM) + 1.0 V
V
VCORE (NOM)
Mode2=Low, Mode1=Don’t Care, Mode0=Low
VCORE Dropout Voltage
V
V
ILIMIT
mA
600
800
1000
Notes
10. Refer to Table 2, page 9.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions 4.75 V ≤ VIO ≤ 5.25 V, 13 V ≤ VB+ ≤ 32 V, and 0°C ≤ TJ ≤ 105°C unless otherwise noted.
Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
–
–
0.825
2.6
–
–
7.0
8.0
13
VB+ (MIN)
–
–
9.0
V
VB+(ASSERT)
–
1.9
2.2
V
–
0.25
0.4
–
–
VI/O(NOM)
MODE TERMINALS OPERATING VOLTAGES
Mode Control Terminals Low Voltage
Mode Control Terminals High Voltage
Mode Control Terminals Voltage with Input Floating
VIL(Moden)
V
VIH (Moden)
V
VMode(FLOAT)
VB+ = 13 V to 14 V
V
SUPERVISOR CIRCUITRY (RST, VCORE)
Minimum Function VB+ for Charge Pump and Oscillator Running
Minimum VB+ for RST Assertion, VB+ Rising
RST Low Voltage
VOL
VB+ = 2.0 V, IRST ≤ 5.0 mA
V
RST VI / O Threshold
VI / O Rising
VI / OT+
VI / O Falling
VI / OT-
VI/O (NOM)
- 300 mV
–
–
VHYSVI/O
10
–
100
VCORE Rising
VCORET+
–
–
VCORE (NOM)
VCORE Falling
VCORET-
–
–
RST Hysteresis for VI / O
RST VCORE Threshold
RST Hysteresis for VCORE
TJ (TSD)
Overtemperature Hysteresis
V
mV
10
50
100
0.5
–
0.9
V
°C
–
–
170
TJ (HYSTERESIS)
–
20
–
VB
VB+ 8
VB+ 9
VB+ 10
VB
VB+ 10
VB+ 12
VB+ 14
TJ Rising
mV
- 30 mV
VCORE (SHUTDOWN)
VB+ = 13 V to 32 V
Thermal Shutdown Temperature
- 300 mV
- 50 mV
VHYS CORE
VB+ = 13 V to 32 V
VCORE - VI / O for VCORE Shutdown
VCORE (NOM)
V
°C
VB CHARGE PUMP
Boost Voltage (11)
VB+ = 12 V, Ivb = 0.5 mA
VB+ = 32 V, Ivb = 0.5 mA
V
Notes
11. Bulk capacitor ESR ≤ 10 milliohms
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Freescale Semiconductor
7
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 4.75 V ≤ VIO ≤ 5.25 V, 13 V ≤ VB+ ≤ 32 V, and 0°C ≤ TJ ≤ 105°C unless otherwise noted.
Typical values noted reflect the approximate parameter mean at TA = 25°C under nominal conditions unless otherwise noted
Characteristic
Symbol
Min
Typ
Max
Unit
D
45
49
55
%
20
35
50
VI /O SWITCHING REGULATOR
Duty Cycle
Switching Rise and Fall Time
t R , tF
Load Resistance = 100 Ω, VB+ = 30 V
ns
SUPERVISOR CIRCUITRY (RST)
RST Delay
t DELAY
40
60
80
2.0
4.0
8.0
–
25
75
ICDLY
2.0
3.5
5.0
µA
VTHCD
1.7
2.0
2.2
V
140
170
260
Cdelay = 0.1 µF
RST Filter Time
t FILTER
VB+ = 9.0 V
RST Fall Time
ms
tF
CL = 100 pF, RPULLUP = 4.7 kΩ, 90% to 10%
µs
ns
C Delay
Charge Current
Threshold Voltage
INTERNAL OSCILLATOR
Charge Pump and VI / O Switching Regulator Operating Frequency
VB+ = 12 V to 32 V
f OP
kHz
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Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
VI /O Switching Regulator
The VI /O switching regulator output voltage is determined
by the Mode digital input terminals. The 34710’s Mode
terminals select the output voltage. For example, if Mode2,
Mode1, and Mode0 are set to 0, 0, 0 (respectively) then VI /O
will be set to 5.0 V; if Mode2, Mode1, and Mode0 are all left
floating (i.e., Open, Open, and Open), then the voltage for
VI /O will be set to 3.3 V. Table 2 provides the truth table for
setting the various combination of regulator outputs via the
Mode pins.
The topology of the regulator is a hysteretic buck regulator
operating from the internal ~200 kHz oscillator.
VCORE Linear Regulator
The VCORE linear LDO (low drop-out) regulator can
produce either a +3.3 V, 2.5 V, 1.8 V, or 1.5 V output voltage
at currents up to 500 mA. The input to the VCORE regulator
is a terminal that may be connected to the VI /O regulator
output or to an external power supply. Note, the minimum
input voltage level must be equal to or greater than the
selected VCORE voltage + 0.8 V. (I.e., 0.8V is the LDO
regulator drop out voltage.)
The Mode terminals select the output voltage as depicted
in Table 2.
Table 2. VI /O and VCORE Regulator
Output Voltage Selection
Mode2
Mode1
Mode0
VI /O (V)
VCORE (V)
0
0
0
5.0
3.3
0
0
Open
3.3
2.5
0
Open
0
5.0
1.8
0
Open
Open
3.3
1.8
Open
0
0
5.0
2.5
Open
0
Open
3.3
2.5
Open
Open
0
5.0
1.5
Open
Open
Open
3.3
1.5
Open indicates terminal is not connected externally (i.e. floating).
FUNCTIONAL TERMINAL DESCRIPTION
Power Supply Input (B+)
Main supply voltage for the VI/O Switching Regulator and
general chip bias circuitry.
Core Voltage Regulator Input (Lin B+)
Supply voltage for the VCORE Regulator. May be provided
by the VI/O regulator output or from an independent supply.
Mode Control (MODE 0,1,2)
Mode select terminals to select the VI/O and VCORE output
voltages per table 2. Pull to ground for low state, float for high
state.
Switching Capacitors 1 and 2 (CP1/CP2)
Terminals for the Charge Pump capacitor.
Boost Voltage (VB)
The Boost Voltage is an output terminal used for the
charge pump boost voltage and is a connection point for the
Charge Pump bulk capacitor.It provides a gate drive for the
VI/O Switch FET.
Reset (RST)
during fault conditions. This terminal has no input function
and requires an external pull-up resistor.
The RST terminal is an open drain output driver to prevent
oscillations during the transition. It is recommended to
connect a 0.1 uF capacitor between the CT pin and RST pin.
Note: error conditions must be present for a minimum time,
tFILTER, before the 34710 responds to them. Once all error
conditions have been cleared, RST is held low for an
additional time of tDELAY.
Reset Delay Capacitor (CT)
This terminal is the external delay. It is used with a
capacitor to ground to delay RST turn-on time and to RST to
prevent RST oscillations during chip power-on.
VI/O Switching Regulator Feedback (VFB)
This terminal is the feedback input for the VI/O Switching
Regulator and the output of the regulator application.
VI/O Switching Regulator output (VSWITCH)
This terminal is the Switching output for the VI/O Buck
Regulator. It has internal high side FET.
Reset is an output terminal for supervisory functions. This
terminal is in high state during normal operation and low state
34710
Analog Integrated Circuit Device Data
Freescale Semiconductor
9
FUNCTIONAL DESCRIPTION
FUNCTIONAL TERMINAL DESCRIPTION
SUPERVISORY FUNCTIONS
Supervisory Circuitry
The supervisory circuitry provides control of the RST line,
an open drain signal, based on system operating conditions
monitored by the 34710. VI /O, VCORE, VB+, and thermal
shutdown (TSD) detectors in various parts of the chip are
monitored for error conditions. VI /O, VCORE, VB+, and thermal
shutdown have both positive- and negative-going thresholds
for triggering the reset function.
The supervisor circuitry also ensures that the regulator
outputs follow a predetermined power-up and power-down
sequence. Specifically, the sequencing ensures that VI /O is
never less than 0.9 V below VCORE. This means that VCORE VI /O will be clamped at 0.5 V, and that the VCORE regulator
operation will be suppressed during startup and shutdown to
ensure that VCORE - VI /O = 0.9 V.
VB Charge Pump
The high-side MOSFET in the switching regulator (buck
converter) requires a gate drive supply voltage that is biased
higher than the B+ voltage, and this boosted voltage is
provided by the internal charge pump and stored in a
capacitor between the VB pin and the B+ pin. The charge
pump operates directly from the B+ supply, and uses an
internal oscillator operating at 200 kHz.
Internal Oscillator
The internal oscillator provides a 200 kHz square wave
signal for charge pump operation and for the buck converter.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
B+
13 V - 32 V
C1
330 µF
R1
1K
SW1
C1
0.1 mF
1
RST
2
MODE0
3
MODE1
4
MODE2
SUPERVISORY
& SHUTDOWN
13
GND
CT 32
31
CHARGE
CP1
30
PUMP
CP2
VB 29
28
B+
BUCK
27
REG
VSW
26
VFB
25
LINB
24
LDO
23
VCORE
C5
0.1 µF
C6
10 µF
RSERIES
1.8
MC34710
L1
100 µH
D1
MBRS130LT3
C8
330 µF
1
2
V I/O
VCORE
Figure 4. Typical Application Diagram
The MC34710 provides both a buck converter and an LDO
regulator in one IC. Figure 4 above shows a typical
application schematic for the MC34710. L1 is the buck
converter's inductor. The buck inductor is a key component
and must not only present the required reactance, but do so
at a dc resistance of less than 20 milliohms in order to
preserve the converter's efficiency. Also important to the
converter's efficiency is the utilization of a low Vf Schottky
diode for D1.
Note that a 0.1uF capacitor is connected between CT and
the reset pins; this prevents any possibility of oscillations
occurring on the reset line during transitions by allowing the
CT terminal to discharge to ground potential via the RST pin,
and then charge when RST returns to a logic high. The
capacitor between the CP1 and CP2 pins is the charge
pump's “bucket capacitor”, and sequentially charges and
discharges to pump up the reservoir capacitor connected to
the VB pin. Note that the reservoir capacitor's cathode is
connected to B+ rather than ground. Also note that the
charge pump is intended only to provide gate-drive potential
for the buck regulator's internal power MOSFET, and
therefore connecting external loads to the VB pin is not
recommended.
The IC's internal VCORE LDO regulator can provide up to
500 mA of current as long as the operating junction
temperature is maintained below 105 degrees C. The heatgenerating power dissipation of the LDO is primarily a
function of the Volt x Amp product across the LINB+ and
VCORE terminals. Therefore, if the LINB+ voltage is >> than
the selected VCORE voltage + 0.8 V, it is recommended to use
a power resistor in series with the LINB+ input to drop the
voltage and dissipate the heat externally from the IC. For
example, if the output of the buck regulator (V I/O on the
schematic) is used as the input to LINB+, and the mode
switches are set such that V I/O = 5 V and VCORE = 3.3 V,
then a series resistance of 1.8 ohms at the LINB+ pin would
provide an external voltage drop at 500 mA while still leaving
the minimum required headroom of 0.8 V. Conversely, if the
mode switches are set such that V I/O = 3.3 V and VCORE =
2.5 V, then no series resistance would be required, even at
the maximum output current of 500 mA.
Designing a power supply circuit with the MC34710, like all
dc-dc converter ICs, requires special attention not only to
component selection, but also to component placement (i.e.,
printed circuit board layout). The MC34710 has a nominal
switching frequency of 200 kHz, and therefore pcb traces
between the buck converter discrete component terminals
and the IC should be kept as short and wide as possible to
keep the parasitic inductance low. Likewise, keeping these
34710
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
TYPICAL APPLICATIONS
pcb traces short and wide helps prevent the converter's high
di/dt switching transients from causing EMI/RFI.
possible. The square vias in the plane are located to provide
an immediate path to ground from the top copper circuitry.
Figure 5. Typical PCB Layout
Figure 5 shows a typical layout for the pcb traces
connecting the IC's switching terminal (VSWITCH) and the
power inductor, rectifier, and filter components.
Also, it is recommended to design the component layout
so that the switching currents can be immediately sunk into a
broad full-plane ground that provides terminations physically
right at the corresponding component leads. This helps
prevent switching noise from propagating into other sections
of the circuitry.
Figure 6. Bottom Copper Layout
Figure 6 illustrates a pcb typical bottom copper layout for
the area underneath a buck converter populated on the top of
the same section of pcb.
The ground plane is highlighted so the reader may note
how the ground plane has been kept as broad and wide as
Figure 7. Top Copper Layout
Figure 7 shows the corresponding top copper circuit area
with the component placement.
Again, the ground plane and the vias have been
highlighted so the reader may note the proximity of these
current sink pathways to the key converter components. It is
also important to keep the power planes of the switching
converter's output spread as broad as possible beneath the
passive components, as this helps reduce EMI/RFI and the
potential for coupling noise transients into adjacent circuitry.
Figure 8. Output Plane of Buck Converter
Figure 8 shows the output plane of the buck converter
highlighted.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
TYPICAL APPLICATIONS
This layout provides the lowest possible impedance as
well as lowest possible dc resistance for the power routing.
Note that the power path and its return should be placed, if
possible, on top of each other on different layers or opposite
sides of the pcb.
Small ceramic capacitors are placed in parallel with the
Aluminum electrolytics so that the overall bulk filtering
presents a low ESL to the high di/dt switching currents.
Alternatively, special low ESL/ESR switching-grade
electrolytics may be used.
An additional feature of the MC34710 is the 32 SOICW-EP
exposed pad package. The package allows heat to be
conducted from the die down through the exposed metal pad
underneath the package and into the copper of the pcb. In
order to best take advantage of this feature, a grid array of
thru-hole vias should be placed in the area corresponding to
the exposed pad, and these vias then should then connect to
a large ground plane of copper to dissipate the heat into the
ambient environment. An example of these vias can be seen
in the previous figures of a typical pcb layout.
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Analog Integrated Circuit Device Data
Freescale Semiconductor
13
PACKAGING
PACKAGE DIMENSIONS
PACKAGING
PACKAGE DIMENSIONS
EW (Pb-FREE) SUFFIX
32-LEAD SOICW-EXPOSED PAD
PLASTIC PACKAGE
98ASA10627D
ISSUE O
34710
14
Analog Integrated Circuit Device Data
Freescale Semiconductor
PACKAGING
PACKAGE DIMENSIONS
EW (Pb-FREE) SUFFIX
32-LEAD SOICW-EXPOSED PAD
PLASTIC PACKAGE
98ASA10627D
ISSUE O
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Freescale Semiconductor
15
REVISION HISTORY
REVISION HISTORY
REVISION
DATE
DESCRIPTION OF CHANGES
2.0
3/2006
•
•
•
•
•
Converted to Freescale format
Updated Maximum Ratings, Static and Dynamic Characteristics tables.
Updated packaging drawing
Changed terminal VI/O_OUT to VFB
Implemented Revision History page
3.0
3/2006
•
•
Updated format from Preliminary to Advance Information.
Format and style corrections to match standard template.
34710
16
Analog Integrated Circuit Device Data
Freescale Semiconductor
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MC34710
Rev. 3.0
3/2006
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