MOTOROLA 34710 Technical data

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MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Preliminary Information

Adjustable Dual Output Switching Power Supply

Document order number: MC34710

Rev 1.0, 04/2004

34710

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.

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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

Simplified Application Diagram

34710 Simplified Application Diagram

12 V to 32 V

34710

ADJUSTABLE DUAL OUTPUT SWITCHING POWER SUPPLY

EW (Pb-FREE) SUFFIX

CASE 1324-02

32-LEAD SOICW-EP

ORDERING INFORMATION

Device

PC34710EW/R2 0°C to 85°C 32 SOICW-EP

Temperature

Range (T

)

A

Package

Frees

This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.

B+

V

b

V

CP2

V

CP1

Mode0 Mode1 Mode2

RST

GND

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SWITCH

I/O_OUT

LINB+

V

CORE

V

I/O

CORE

MCU

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B+

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MODE0

MODE1 MODE2

LINB+

Figure 1. 34710 Simplified Internal Block Diagram

2000 Hz

Oscillator

Supervisory and

Temperature

Shutdown

Switching Regulator

Regulator

GND

Bandgap

V

I/O

V

CORE

Linear

Charge

Pump

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CP1 CP2 V

b

RST

C

t

V

I/O_OUT

V

SWITCH

V

CORE

(2)

Frees

34710 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 2

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RST MODE0 MODE1 MODE2

GND

TERMINAL FUNCTION DESCRIPTION

Terminal

1

2 3 4

5– 12,

14–22

13 GND Ground

23, 24 V

25 LINB+ Core Voltage Regulator

26 V

27 V

28 B+ Power Supply Input

29 V

30 CP2 Switching Capacitor 2

31 CP1 Switching Capacitor 1

32 C

Terminal

Name

RST

MODE0 MODE1 MODE2

NC No Connects

CORE

I/O_OUT

SWITCH

b

t

Formal Name Definition

Reset

Mode Control These input terminals control V

Core Voltage Regulator

V

Output

Input

Switching Regulator

I/O

Feedback

Switching Regulator

I/O

Switch Output

Boost Voltage

Reset Delay Capacitor

NC NC NC NC NC NC NC NC

NC NC NC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Reset input and output. This terminal is open drain.

No internal connection to this terminal.

Ground.

Core regulator output voltage.

Core regulator input voltage.

Feedback terminal for V

V

switching regulator switching output.

I/O

Regulator input voltage.

Boost voltage storage node.

Charge pump capacitor connection 2.

Charge pump capacitor connection 1.

Reset delay adjustment capacitor.

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

switching regulator and internal logic supply.

I/O

C CP1 CP2 V B+ V V LINB+ V V NC NC NC NC NC NC

I/O_OUT

t

b

SWITCH

I/O_OUT

CORE

and V

output voltages.

CORE

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 34710

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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

= 0 A

B

+

Terminal Soldering Temperature (Note 1)

Power Dissipation (Note 2)

ESD Standoff Voltage

Non-Operating, Unbiased, Human Body Model (Note 3)

Thermal Resistance

Junction-to-Ambient (Note 4)

Junction-to-Ambient (Note 2)

Junction-to-Case

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GLOBAL OPERATING RATINGS

Operating Ambient Temperature

Operating Device Junction Temperature

Input Power Supply Voltage

I

= 0 A to 3.0 A

B

+

Quiescent Bias Current from B+ (Note 5)

V

= 12 V to 32 V

B

+

Operating Junction Temperature

V

SWITCHING REGULATOR (Note 6)

I/O

Maximum Output Voltage Startup Overshoot (C

MODE0 = 0

MODE0 = Open

Maximum Output Current

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T

= 0°C to 105°C

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.

Frees

2. With 2.0 in

3. ESD1 testing is performed in accordance with the Human Body Model (C

4. With no additional heatsinking.

5. Maximum quiescent power dissipation is 0.25 W.

6. 12 V ≤ V

2

of copper headsink.

≤ 32 V and -20°C ≤ TJ ≤ 145°C unless otherwise noted.

B+

= 330 µF)

OUT

T

SOLDER

V

(STARTUP)

I/O

ZAP

V

B

+

P

D

ESD1

R

JA

θ

R

JA

θ

R

JC

θ

T

A

T

J

V

B

+

IB+(q)

T

J

I

VI/O

= 100 pF, R

ZAP

-0.3 to 36

260 °C

3.0 W

±2000

45

25

2.0

0 to 85 °C

105 °C

12 to 32

7.5

-0 to 105 °C

5.4

3.6

1.2

= 1500 Ω).

V

°C/W

V

mA

V

A

34710 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 4

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MAXIMUM RATINGS (continued)

All voltages are with respect to ground unless otherwise noted.

Rating Symbol Max Unit

V

LINEAR REGULATOR (Note 7)

CORE

Maximum Output Voltage Startup Overshoot (C

MODE[2:0] = [0,x,0]

MODE[2:0] = [0,x,Open]

MODE[2:0] = [Open,x,0]

MODE[2:0] = [Open,x,Open]

Maximum Output Current

T

= 0°C to 105°C, V

J

Notes

7. 12 V ≤ V

8. Refer to Table 1, page 10.

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9. Pulse testing with low duty cycle used.

≤ 32 V and -20°C ≤ TJ ≤ 145°C unless otherwise noted.

B+

LINB

+

≤ V

(NOM) + 0.8 V (Note 9)

CORE

=10µF) (Note 8)

OUT

V

CORE

(STARTUP)

I

VCORE

V

3.6

2.7

2.0

1.65

mA

500

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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 34710

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