Document Outline
- Introduction
- 34170 Simplified Application Diagram
- 34710 Simplified Internal Block Diagram
- Terminal Function Description
- Maximum Ratings
- Static Electrical Characteristics
- Dynamic Electrical Characteristics
- Timing Diagram
- System/Application Information
- Introduction
- Supervisory and Miscellaneous Functions
- Applications
- Package Dimensions
Simplified Application Diagram
MCU
34710
V
SWITCH
V
I/O_OUT
V
CORE
Vb
RST
GND
CP1
LINB+
Mode0
Mode1
Mode2
CP2
B+
12 V to 32 V
V
I/O
V
CORE
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
This document contains information on a product under development.
Motorola reserves the right to change or discontinue this product without notice.
Motorola, Inc. 2004
Document order number: MC34710
Rev 1.0, 04/2004
34710
Preliminary Information
Adjustable Dual Output Switching
Power Supply
The 34710 is a dual-output power regulator IC that integrates a switching
regulator, a linear regulator, supervisor circuitry, and a power supply
sequencer. With a wide operating input voltage range of 12 V to 32 V and
robust temperature limits, the 34710 is applicable in many commercial and
industrial applications that use an MCU.
A user-selectable 5.0 V/3.3 V buck switching regulator is provided for
board-level I/Os and user circuitry. The regulator is capable of delivering up to
1.0 A. The MCU core voltage is an adjustable 3.3 V/2.5 V/1.8 V/1.5 V linear
voltage regulator that can supply up to 500 mA.
The switching and linear regulator output voltage are determined through
three digital input mode terminals that can be controlled by an MCU.
Features
High-Current Adjustable 5.0 V/3.3 V Switching Regulator
Low Noise User-Selectable 3.3 V/2.5 V/1.8 V/1.5 V Linear Regulator
On-Chip Thermal Shutdown and Error Reset Circuitry
Supervisory Functions (Power-ON Reset and Error Reset Circuitry)
Sequenced I/O and Core Voltages
Pb-Free Packaging Designated by Suffix Code EW
EW (Pb-FREE) SUFFIX
CASE 1324-02
32-LEAD SOICW-EP
ORDERING INFORMATION
Device
Temperature
Range (T
A
)
Package
PC34710EW/R2
0C to 85C
32 SOICW-EP
ADJUSTABLE DUAL OUTPUT
SWITCHING POWER SUPPLY
34710 Simplified Application Diagram
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34710
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
2
Figure 1. 34710 Simplified Internal Block Diagram
Charge
2000 Hz
Oscillator
Pump
Supervisory and
Temperature
Shutdown
Bandgap
Switching
Regulator
V
CORE
Linear
Regulator
CP1
CP2
V
b
RST
C
t
V
I/O_OUT
V
SWITCH
V
CORE
(2)
MODE0
MODE1
MODE2
LINB+
B+
GND
V
I/O
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34710
3
TERMINAL FUNCTION DESCRIPTION
Terminal
Terminal
Name
Formal Name
Definition
1
RST
Reset
Reset input and output. This terminal is open drain.
2
3
4
MODE0
MODE1
MODE2
Mode Control
These input terminals control V
I/O_OUT
and
V
CORE
output voltages.
512,
1422
NC
No Connects
No internal connection to this terminal.
13
GND
Ground
Ground.
23, 24
V
CORE
Core Voltage Regulator
Output
Core regulator output voltage.
25
LINB+
Core Voltage Regulator
Input
Core regulator input voltage.
26
V
I/O_OUT
V
I/O
Switching Regulator
Feedback
Feedback terminal for V
I/O
switching regulator and internal logic supply.
27
V
SWITCH
V
I/O
Switching Regulator
Switch Output
V
I/O
switching regulator switching output.
28
B+
Power Supply Input
Regulator input voltage.
29
V
b
Boost Voltage
Boost voltage storage node.
30
CP2
Switching Capacitor 2
Charge pump capacitor connection 2.
31
CP1
Switching Capacitor 1
Charge pump capacitor connection 1.
32
C
t
Reset Delay Capacitor
Reset delay adjustment capacitor.
C
t
1
B+
V
SWITCH
V
I/O_OUT
LINB+
V
CORE
V
CORE
NC
NC
NC
NC
NC
NC
V
b
CP1
CP2
RST
NC
NC
NC
NC
NC
NC
NC
NC
GND
NC
NC
NC
MODE2
MODE0
MODE1
8
9
10
11
12
13
14
15
16
3
4
5
6
7
2
32
25
24
23
22
21
20
19
18
17
30
29
28
27
26
31
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34710
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
4
MAXIMUM RATINGS
All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Max
Unit
GLOBAL ABSOLUTE MAXIMUM RATINGS
Input Power Supply Voltage
I
B
+
= 0 A
V
B
+
-0.3 to 36
V
Terminal Soldering Temperature (Note 1)
T
SOLDER
260
C
Power Dissipation (Note 2)
P
D
3.0
W
ESD Standoff Voltage
Non-Operating, Unbiased, Human Body Model (Note 3)
V
ESD1
2000
V
Thermal Resistance
Junction-to-Ambient (Note 4)
Junction-to-Ambient (Note 2)
Junction-to-Case
R
JA
R
JA
R
JC
45
25
2.0
C/W
GLOBAL OPERATING RATINGS
Operating Ambient Temperature
T
A
0 to 85
C
Operating Device Junction Temperature
T
J
105
C
Input Power Supply Voltage
I
B
+
= 0 A to 3.0 A
V
B
+
12 to 32
V
Quiescent Bias Current from B+ (Note 5)
V
B
+
= 12 V to 32 V
I
B+
(q)
7.5
mA
Operating Junction Temperature
T
J
-0 to 105
C
V
I/O
SWITCHING REGULATOR (Note 6)
Maximum Output Voltage Startup Overshoot (C
OUT
= 330
F)
MODE0 = 0
MODE0 = Open
V
I/O
(STARTUP)
5.4
3.6
V
Maximum Output Current
T
A
= 0C to 105C
I
VI/O
1.2
A
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.
With 2.0 in
2
of copper headsink.
3.
ESD1 testing is performed in accordance with the Human Body Model (C
ZAP
= 100 pF, R
ZAP
= 1500
).
4.
With no additional heatsinking.
5.
Maximum quiescent power dissipation is 0.25 W.
6.
12 V
V
B+
32 V and -20C T
J
145C unless otherwise noted
.
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34710
5
V
CORE
LINEAR REGULATOR (Note 7)
Maximum Output Voltage Startup Overshoot (C
OUT
= 10
F) (Note 8)
MODE[2:0] = [0,x,0]
MODE[2:0] = [0,x,Open]
MODE[2:0] = [Open,x,0]
MODE[2:0] = [Open,x,Open]
V
CORE
(STARTUP)
3.6
2.7
2.0
1.65
V
Maximum Output Current
T
J
= 0C to 105C, V
LINB
+
V
CORE
(NOM) + 0.8 V (Note 9)
I
VCORE
500
mA
Notes
7.
12 V
V
B+
32 V and -20C T
J
145C unless otherwise noted
.
8.
Refer to
Table 1
, page 10.
9.
Pulse testing with low duty cycle used.
MAXIMUM RATINGS (continued)
All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Max
Unit
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34710
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
6
STATIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 4.75 V
V
IO
5.25 V, 12 V
V
B
+
32 V, and 0
C
T
J
105
C unless otherwise noted.
Typical values noted reflect the approximate parameter mean at T
A
= 25
C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
V
I/O
SWITCHING REGULATOR
Logic Supply Voltage (I
VI/O
= 25 mA to 1.0 A)
MODE0 = 0
MODE0 = Open
V
I/O
4.8
3.15
5.2
3.45
V
Logic Supply Current
V
I/O
= Nominal, Power Dissipation in Switching Regulator = 0.45 W
I
VI/O
0.025
1.0
A
Output On Resistance
V
B
+
= 12 V to 32 V
R
DS(ON)
0.5
TBD
2.0
Soft Start Threshold Voltage
MODE0 = X
V
I/O
(SOFT)
2.5
V
Current Limit Threshold (T
J
= 25
C to 100C)
Normal Operation
Soft Start, V
I/O
2.5 V
I
LIMIT
(OP)
I
LIMIT
(SOFT)
2.1
1.3
3.2
1.8
A
Minimum Voltage Allowable on V
SWITCH
Terminal
T
J
= 25
C to 100C
V
VSWITCH
(MIN)
-0.5
V
V
CORE
LINEAR REGULATOR
Supply Voltage (I
VCORE
= 5.0 mA to 500 mA) (Note 10)
MODE[2:0] = [0,x,0]
MODE[2:0] = [0,x,Open]
MODE[2:0] = [Open,x,0]
MODE[2:0] = [Open,x,Open]
V
CORE
(NOM)
3.15
2.35
1.71
1.425
3.45
2.65
1.89
1.575
V
Supply Current
V
CORE
= V
CORE
(NOM)
I
VCORE
1.0
500
mA
V
CORE
Dropout Voltage
V
CORE
= V
CORE
(NOM), I
VCORE
= 0.5 A
I
VCORE
(DROPOUT)
0.8
V
Regulator Input Voltage
V
CORE
= V
CORE
(NOM), I
VCORE
= 0.5 A
V
LINB
+
V
CORE
(NOM)
+ 1.0
10
V
Normal Current Limit Threshold
T
J
= 25C to 100C, V
LINB
+
= V
CORE
(NOM) + 1.0 V
I
LIMIT
800
1000
mA
Notes
10.
Refer to
Table 1
, page 10.
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34710
7
MODE TERMINALS OPERATING VOLTAGES
MODE Control Terminals Low Voltage
T
J
= 0C to TBDC, V
B
+
= 12 V to 32 V
V
IL
(MODEn)
0.825
V
MODE Control Terminals High Voltage
T
J
= 0C to TBDC, V
B
+
= 12 V to 32 V
V
IH
(MODEn)
2.6
V
MODE Control Terminals Voltage with Input Floating
T
J
= 0C to TBDC, V
B
+
= 12 V to 14 V
T
J
= 0C to TBDC, V
B
+
= 14 V to 32 V
V
MODE
(FLOAT)
7.0
8.0
12
13.2
V
SUPERVISOR CIRCUITRY
Minimum Function V
B
+
for Charge Pump and Oscillator Running
V
B
+
(MIN)
9.0
V
Minimum V
B
+
for RST Assertion, V
B
+
Rising
V
B+
(ASSERT)
2.0
V
RST
Low Voltage
V
B
+
= 2.0 V, I
RST
5.0 mA
V
OL
0.4
V
RST
V
I/O
Threshold
V
I/O
Rising
V
I/O
Falling
V
I/O
t+
V
I/O
t
-
V
I/O
(NOM)
-
225 mV
V
I/O
(NOM)
-
80 mV
V
RST
Hysteresis for V
I/O
V
HYSVI/O
10
100
mV
RST
V
CORE
Threshold
V
CORE
Rising
V
CORE
Falling
V
CORE
t+
V
CORE
t
-
V
CORE
(NOM)
-
225 mV
V
CORE
(NOM)
-
80 mV
V
RST
Hysteresis for V
CORE
V
B
+
= 12 V to 32 V
V
HYS CORE
10
100
mV
V
CORE
-
V
I/O
for V
CORE
Shutdown
V
B
+
= 12 V to 32 V
V
CORE
(SHUTDOWN)
TBD
V
Thermal Shutdown Temperature
T
J
Rising
TJ(TSD)
170
C
Overtemperature Hysteresis
T
J
(HYSTERESIS)
20
TBD
C
V
b
CHARGE PUMP
Boost Voltage (Note 11)
V
B
+
= 12 V to 32 V, I
vb
= 0.5 mA
V
b
V
B
+
+10 V
V
B
+
+12 V
V
Notes
11.
Bulk capacitor ESR
10 .
STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions 4.75 V
V
IO
5.25 V, 12 V
V
B
+
32 V, and 0
C
T
J
105
C unless otherwise noted.
Typical values noted reflect the approximate parameter mean at T
A
= 25
C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
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34710
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
8
DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 4.75 V
V
IO
5.25 V, 12 V
V
B
+
32 V, and 0
C
T
J
105
C unless otherwise noted.
Typical values noted reflect the approximate parameter mean at T
A
= 25
C under nominal conditions unless otherwise noted
Characteristic
Symbol
Min
Typ
Max
Unit
V
I/O
SWITCHING REGULATOR
Duty Cycle
D
45
55
%
Switching Rise and Fall Time
Load Resistance = 100
, V
B
+
= 30 V
t
r
,
t
f
25
ns
Switching Rise and Fall Time
Load Resistance = 100
, V
B
+
= 30 V
t
r
+ t
f
50
ns
SUPERVISOR CIRCUITRY
RST
Delay
C
delay
= 0.1
F
t
delay
48
82
ms
RST
Filter Time
V
B
+
= 9.0 V
t
filter
1.0
6.0
s
RST
Fall Time
C
L
= 100 pF, R
PULLUP
= 4.7 k
, 90% to 10%
t
f
125
ns
External Low (Note 12)
V
I/O
= 5.0 V
t
slpl
(Note 13)
30
ns
RST
Recovery Time Before Next RST Input (Note 12)
V
I/O
= 5.0 V
t
phsl
10
s
INTERNAL OSCILLATOR
Charge Pump and V
I/O
Switching Regulator Operating Frequency
V
B
+
= 9.0 V to 32 V
f
OP
140
260
kHz
Notes
12.
See
Figure 2, RST Timing
, page 9.
13.
t
slpl
is an input.
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34710
9
Timing Diagram
Figure 2. RST Timing
External
RST
Input
V
IH
V
IL
34710
RST
V
IH
V
IL
t
slpl
t
snl
t
delay
t
phsl
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34710
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
10
SYSTEM/APPLICATION INFORMATION
INTRODUCTION
V
I/O
Switching Regulator
The V
I/O
switching regulator output voltage is determined by
the MODE digital input terminals. The 34710's MODE[2:0]
select the output voltage (
Table 1
). For example, if
MODE[2:0] = 0, 0, 0, then V
I/O
= 5.0 V; if MODE[2:0] = Open,
Open, Open, then V
I/O
= 3.3 V. The MODE0 terminal controls
the output voltage of both regulators.
The topology of the regulator is a bang-bang buck regulator
operating from the internal ~200 kHz oscillator.
V
CORE
Linear Regulator
The V
CORE
linear regulator can produce a +3.3 V, 2.5 V,
1.8 V, or 1.5 V output voltage at 500 mA. The input to the
V
CORE
regulator is a terminal that may be connected to the V
I/
O
regulator output. The minimum input voltage must be
V
CORE
(
NOM
) + 0.8 V.
The MODE[2:0] terminals select the output voltage as
depicted in
Table 1
.
SUPERVISORY AND MISCELLANEOUS FUNCTIONS
Introduction
The supervisor circuitry provides control of the
RST
line, an
open drain signal, based on system operating conditions
monitored by the 34710. V
I/O
, V
CORE
, V
B+
, and thermal
shutdown (TSD) detectors in various parts of the chip are
monitored for error conditions. Because other devices in the
system may trigger a reset, the
RST
line itself is also monitored,
but the supervisor circuitry controls all reset timing, including
externally generated resets. Driving the
RST
line low causes the
system to be held in the reset state. V
I/O
, V
CORE
, V
B+
, and
thermal shutdown have both positive- and negative-going
thresholds.
The supervisor circuitry also ensures that the power supplies
sequence properly. Specifically, that V
I/O
is never less than
TBD V below V
CORE
. This means that V
CORE
-
V
I/O
will be
clamped at 0.5 V, and that the V
CORE
regulator operation will be
suppressed during startup and shutdown to ensure that
V
CORE
-
V
I/O
= TBD V.
Static Operating Specifications
The
RST
output is an I/O device with an open drain output
driver with a pullup and a CMOS digital input gate (
Figure 3
).
This I/O structure allows wired OR connection to the MCU's
RST
I/O terminal, as well as allowing the MCU to initiate a reset
cycle by driving its
RST
terminal low.
When responding to a
MCU request for a reset cycle, the 34710 must respond rapidly
enough to prevent a glitch.
Figure 2
, page 9, shows the timing
parameters for responding to an externally applied
RST
signal.
The rise time may be relatively slow, depending on the load
capacitance, and the internal
RST
input gate must operate
reliably (no oscillations during the transition) under these
conditions, i.e., the
RST
input can be inhibited for up to
t
phsl
(
MAX
). Error conditions must be present for a minimum
time, t
filter
, before the 34710 responds to them. Once all error
conditions are cleared,
RST
is held low for an additional time of
t
delay
. If any monitored item falls below its negative-going
threshold for t
filter
, 1.0
s to 6.0 s, the t
delay
will be restarted
when system operating conditions are met. The trigger for the
t
delay
retriggerable one shot should be ([V
I/O
(
LOW
) +
V
CORE
(
LOW
) + V
B+
(
LOW
) + T
J
(
TSD
)] & t
filter
), where t
filter
is the
1.0
s to 6.0 s delay.
Figure 3.
RST
Terminal Interface
Table 1. V
I/O
and V
CORE
(NOM)
Regulator
Output Voltage Selection
MODE2
MODE1
MODE0
V
I/O
(V)
V
CORE
(NOM)
(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.
From
Internal
Reset
Circuits
To Internal
Gates
RST
C
LOAD
(Optional)
V
I/O
R
PULLUP
4.7 k
(Optional)
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.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34710
11
V
b
Charge Pump
The high-side MOSFETs in the H-Bridge motor drivers and
voltage regulators switch require a gate voltage in excess of
V
B+,
which is provided by the V
b
supply. The V
b
regulator is a
charge pump, switching directly off the V
B+
supply, and uses an
internal oscillator operating at 200 kHz.
Internal Oscillator
The internal oscillator provides timing for the charge pump
and switching regulators.
APPLICATIONS
Power Dissipation
The power budget is described in
Table 2
. The maximum
dissipation for this device is 1.0 W continuous.
Table 2. Power Budget
Functional Block
Watt
Bias
0.00
Charge Pump
0.15
Switching Regulator
0.45
Linear Regulator
0.35
Total
0.95
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34710
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
12
PACKAGE DIMENSIONS
NOTES:
1.
ALL DIMENSIONS ARE IN MILLIMETERS.
2.
DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
3.
DATUMS B AND C TO BE DETERMINED AT THE PLANE
WHERE THE BOTTOM OF THE LEADS EXIT THE
PLASTIC BODY.
4.
THIS DIMENSION DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURRS. MOLD FLASH,
PROTRUSION OR GATE BURRS SHALL NOT EXCEED
0.15 MM PER SIDE. THIS DIMENSION IS DETERMINED
AT THE PLANE WHERE THE BOTTOM OF THE LEADS
EXIT THE PLASTIC BODY.
5.
THIS DIMENSION DOES NOT INCLUDE INTERLEAD
FLASH OR PROTRUSIONS. INTERLEAD FLASH AND
PROTRUSIONS SHALL NOT EXCEED 0.25 MM PER
SIDE. THIS DIMENSION IS DETERMINED AT THE
PLANE WHERE THE BOTTOM OF THE LEADS EXIT THE
PLASTIC BODY.
6.
THIS DIMENSION DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR PROTRUSION
SHALL NOT CAUSE THE LEAD WIDTH TO EXCEED 0.4
MM PER SIDE. DAMBAR CANNOT BE LOCATED ON
THE LOWER RADIUS OR THE FOOT. MINIMUM SPACE
BETWEEN PROTRUSION AND ADJACENT LEAD
SHALL NOT LESS THAN 0.07 MM.
7.
EXACT SHAPE OF EACH CORNER IS OPTIONAL.
8.
THESE DIMENSIONS APPLY TO THE FLAT SECTION
OF THE LEAD BETWEEN 0.10 MM AND 0.3 MM FROM
THE LEAD TIP.
9.
THE PACKAGE TOP MAY BE SMALLER THAN THE
PACKAGE BOTTOM. THIS DIMENSION IS
DETERMINED AT THE OUTERMOST EXTREMES OF
THE PLASTIC BODY EXCLUSIVE OF MOLD FLASH, TIE
BAR BURRS, GATE BURRS AND INTER-LEAD FLASH,
BUT INCLUDING ANY MISMATCH BETWEEN THE TOP
AND BOTTOM OF THE PLASTIC BODY.
CL
10.9
7.4
1
16
17
32
0.10
A
2.35
SEATING
PLANE
0.9
SECTION B-B
0.65
R0.08 MIN
B
A
PIN 1 ID
(0.29)
0.38
0.25
(0.203)
PLATING
BASE METAL
SECTION A-A
ROTATED 90 CLOCKWISE
8
0.19
0.22
9
5
0.13
M
C A
M
B
6
A
C
7.6
11.1
9
4
10.3
5.15
A
32X
30X
2.65
0.3 A
2X 16 TIPS
B C
B
B
0.29
0.13
0.5
0
8
0
0.25
GAUGE PLANE
MIN
EW (Pb-FREE) SUFFIX
32-LEAD SOICW-EXPOSED PAD
PLASTIC PACKAGE
CASE 1324-02
ISSUE A
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34710
13
NOTES
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34710
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
14
NOTES
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34710
15
NOTES
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HOW TO REACH US:
USA/EUROPE/LOCATIONS NOT LISTED:
JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center
Motorola Literature Distribution
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1-800-521-6274 or 480-768-2130
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2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong
852-26668334
HOME PAGE: http://motorola.com/semiconductors
MC34710
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Motorola, Inc. 2004
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