Freescale Semiconductor
Technical Data
Document number: MC34710
Rev 4, 8/2008
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
to 32V, the 34710 is applicable to many commercial and industrial
applications using embedded MCUs.
A mode-selected 5.0 or 3.3V DC-DC switching regulator is
provided for board-level I/O and user circuitry up to 700mA. A linear
regulator provides mode-selected core supply voltages of either 3.3V,
2.5V, 1.8V, or 1.5V at currents up to 500mA.
The supervisor circuitry ensures that the regulator outputs follow a
predetermined power-up and power-down sequence.
Features
• Efficient 5.0V / 3.3V 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
34710
DUAL OUTPUT DC-DC & LINEAR
REGULATOR
EW SUFFIX (PB-FREE)
98ASA10627D
32-PIN SOICW
ORDERING INFORMATION
Device
MC34710EW/R2
Temperature
Range (T
A
)
0°C to 85°C
Package
32 SOICW-EP
VI/O
13 V to 32 V
34710
B+
VB
CP2
CP1
MODE0
MODE1
MODE2
RST
LINB+
VCORE
GND
VCORE
CT
VSWITCH
VFB
VI/O
MCU
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., 2006-2008. All rights reserved.
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
B+
200 kHz
Oscillator
Charge
Pump
CP1
CP2
VB
Supervisory and
Temperature
Shutdown
RST
CT
Bandgap
V
I/O
Switching
Regulator
V
CORE
Linear
Regulator
VFB
VSWITCH
MODE0
MODE1
MODE2
LINB+
VCORE
GND
Figure 2. 34710 Simplified Internal Block Diagram
34710
2
Analog Integrated Circuit Device Data
Freescale Semiconductor
PIN CONNECTIONS
PIN 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
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
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 Pin Connections
Table 1. 34710 Pin Definitions
Pin
Number
1
2
3
4
5 – 12,
14 –22, 24
13
23
25
26
Pin Name
RST
Pin Function
Reset
Input
Formal Name
Reset
Mode Control
Definition
Reset is an open drain output only.
These input pins control V
FB
and V
CORE
output voltages.
Mode0
Mode1
Mode2
NC
GND
VCORE
LINB+
VFB
NC
Ground
Output
Input
Input
No Connects
Ground
Core Voltage
Regulator Output
Core Voltage
Regulator Input
V
I/O
Switching
Regulator
Feedback
V
I/O
Switching
Regulator Switch
Output
Power Supply
Input
Boost Voltage
CP Capacitor
Positive
CP Capacitor
Negative
Reset Delay
Capacitor
No internal connection to this pin.
Ground.
Core regulator output voltage.
Core regulator input voltage.
Feedback pin for V
I/O
switching regulator and internal logic supply.
27
VSWITCH
Output
V
I/O
switching regulator switching output.
28
29
30
31
32
B+
VB
CP2
CP1
CT
Input
Output
Passive
Component
Passive
Component
Passive
Component
Regulator input voltage.
Boost voltage storage node.
Charge pump capacitor connection 2.
Charge pump capacitor connection 1.
Reset delay adjustment capacitor.
34710
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
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.
Rating
ELECTRICAL RATINGS
Input Power Supply Voltage
I
B
+
= 0.0A
Peak Package Reflow Temperature During Reflow
(1)
,
(2)
Power Dissipation
(3)
ESD Standoff Voltage
Non-Operating, Unbiased, Human Body Model
(4)
Thermal Resistance
Junction-to-Ambient
(5)
Junction-to-Ambient
(3)
Junction-to-Exposed-Pad
THERMAL RATINGS
Operating Ambient Temperature
Operating Junction Temperature
Input Power Supply Voltage
I
B
+
= 0.0A to 3.0A
Quiescent Bias Current from B+
(6)
V
B
+
= 13 to 32V
V
I /O
SWITCHING REGULATOR
(7)
Maximum Output Voltage Startup Overshoot (C
OUT
= 330μF)
Mode0 = 0
Mode0 = Open
Maximum Output Current
T
A
= 0°C to 105°C
I
VI/O
700
V
I / O
(
STARTUP
)
5.4
3.6
mA
V
I
B+
(
Q
)
7.5
T
A
T
J
V
B
+
13 to 32
mA
0 to 85
0 to 105
°C
°C
V
R
θ
JA
R
θ
JA
R
θ
JC
45
25
2.0
V
ESD1
±2000
°C/W
T
PPRT
P
D
V
B
+
-0.3 to 36
Note 2
3.0
°C
W
V
V
Symbol
Max
Unit
Notes
1. ESD testing is performed in accordance with the Human Body Model (HBM) (C
ZAP
= 100 pF, R
ZAP
= 1500
Ω),
the Machine Model (MM)
(C
ZAP
= 200 pF, R
ZAP
= 0
Ω),
and the Charge Device Model (CDM), Robotic (C
ZAP
= 4.0pF).
2.
3.
4.
5.
6.
7.
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.
With 2.0 in
2
of copper heatsink.
ESD1 testing is performed in accordance with the Human Body Model (C
ZAP
= 100pF, R
ZAP
= 1500Ω).
With no additional heatsinking.
Maximum quiescent power dissipation is 0.25W.
13V
≤
V
B+
≤
32V and - 20°C
≤
T
J
≤
145°C, unless otherwise noted
.
34710
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
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
V
CORE
LINEAR REGULATOR
(8)
Maximum Output Voltage Startup Overshoot (C
OUT
= 10μF)
(9)
Mode2=Low, Mode1=Low, Mode0=Low
Mode2=Open, Mode1=Low, Mode0=Don’t Care
Mode2=Low, Mode1=Open, Mode0=Don’t Care
Mode2=Open, Mode1=Open, Mode0=Don’t Care
Maximum Output Current
T
J
= 0°C to 105°C, V
LINB
+
≤
V
CORE
(NOM) + 0.8V
(10)
Notes
8. 13V
≤
V
B+
≤
32V and - 20°C
≤
T
J
≤
145°C, unless otherwise noted
.
9.
10.
Refer to
Table 5,
page
9.
Pulse testing with low duty cycle used.
I
VCORE
500
V
CORE
(
STARTUP
)
3.6
2.7
2.0
1.65
mA
V
Symbol
Max
Unit
34710
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
