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Document Number: MC34713

Rev. 5.0, 12/2008

Freescale Semiconductor

Advance Information

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

5.0 A 1.0 MHz Fully Integrated

Single Switch-Mode Power

Supply

The 34713 is a highly integrated, space efficient, low cost, single

synchronous buck switching regulator with integrated N-channel

power MOSFETs. It is a high performance point-of-load (PoL) power

supply with the ability to track an external reference voltage in

different configurations.

Its high efficient 5.0 A continuous output current capability

combined with its voltage tracking/sequencing ability and tight output

regulation, makes it ideal as a single power supply.

The 34713 offers the designer the flexibility of many control,

supervisory, and protection functions to allow for easy implementation

of complex designs. It is housed in a Pb-free, thermally enhanced,

and space-efficient 24-Pin Exposed Pad QFN.

Features

•50 mΩ integrated N-channel power MOSFETs

• Input voltage operating range from 3.0 to 6.0 V

• ±1% accurate output voltage, ranging from 0.7 to 3.6 V

• Voltage tracking capability in different configurations.

• Programmable switching frequency range from 200 kHz to

1.0 MHz with a default of 1.0 MHz

• Programmable soft start timing

• Over-current limit and short-circuit protection

• Thermal shutdown

• Output over-voltage and under-voltage detection

• Active low power good output signal

• Active low shutdown input

• Pb-free packaging designated by suffix code EP.

Figure 1. 34713 Simplified Application Diagram

SWITCH-MODE POWER SUPPLY

EP SUFFIX

98ARL10577D

24-PIN QFN

34713

ORDERING INFORMATION

Device

Temperature

Range (T

)

Package

MC34713EP/R2 -40 to 85°C 24 QFN

VIN

VREFIN

PGND

VDDI

FREQ

ILIM

GND

PVIN

BOOT

INV

COMP

VOUT

34713

VIN

OUT

MASTER

(3.0 TO 6.0 V) VIN

MICROCONTROLLER

DSP,

FPGA,

ASIC

Summary of content (23 pages)

PAGE 1
Freescale Semiconductor Advance Information Document Number: MC34713 Rev. 5.0, 12/2008 5.0 A 1.0 MHz Fully Integrated Single Switch-Mode Power Supply The 34713 is a highly integrated, space efficient, low cost, single synchronous buck switching regulator with integrated N-channel power MOSFETs. It is a high performance point-of-load (PoL) power supply with the ability to track an external reference voltage in different configurations. Its high efficient 5.
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INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM SD Internal Voltage Regulator Thermal Monitoring PG System Reset M1 VIN M2 System Control VDDI BOOT ILIMIT Discharge VIN VBOOT Buck Control Logic Oscillator M3 Gate ISENSE Driver Prog Soft Start ISENSE Current Monitoring PWM Comparator + VDDI VDDI VBG M4 PGND Ramp Generator COMP + Bandgap Regulator SW ILIMIT – ILIM FSW – FREQ Prog Frequency PVIN Error Amplifier INV VREFIN VBG Reference Selection M5 GND VOUT Discharge Figur
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PIN CONNECTIONS VDDI VIN VIN BOOT PVIN PVIN PIN CONNECTIONS 24 23 22 21 20 19 17 SW ILIM 3 Transparent Top View 16 SW PG 4 PIN 25 15 SW NC 5 14 PGND SD 6 13 PGND 7 8 9 10 11 12 PGND 2 VOUT FREQ INV PVIN COMP 18 NC 1 VREFIN GND Figure 3. 34713 Pin Connections Table 1. 34713 Pin Definitions A functional description of each pin can be found in the Functional Pin Description section beginning on page 10.
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PIN CONNECTIONS Table 1. 34713 Pin Definitions (continued) A functional description of each pin can be found in the Functional Pin Description section beginning on page 10. Pin Number Pin Name Pin Function Formal Name 25 GND Ground Thermal Pad Definition Thermal pad for heat transfer. Connect the thermal pad to the analog ground and the ground plane for heat sinking.
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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. Ratings Symbol Value Unit VIN -0.3 to 7.0 V High Side MOSFET Drain Voltage (PVIN) Pin PVIN -0.3 to 7.0 V Switching Node (SW) Pin VSW -0.3 to 7.0 V VBOOT - VSW -0.3 to 7.0 V PG, VOUT,and SD Pins - -0.3 to 7.
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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.
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ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. Static Electrical Characteristics Characteristics noted under conditions 3.0 V ≤ VIN ≤ 6.0 V, - 40°C ≤ TA ≤ 85°C, GND = 0 V, unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max Unit VIN 3.0 - 6.0 V IIN - - 25 mA IINOFF - - 100 µA VDDI 2.35 2.5 2.
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ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 3. Static Electrical Characteristics Characteristics noted under conditions 3.0 V ≤ VIN ≤ 6.0 V, - 40°C ≤ TA ≤ 85°C, GND = 0 V, unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max Unit RDS(ON)M2 1.5 - 4.0 Ω ISW -10 - 10 µA IPVIN -10 - 10 µA IINV -1.0 - 1.
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ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 4. Dynamic Electrical Characteristics Characteristics noted under conditions 3.0 V ≤ VIN ≤ 6.0 V, - 40°C ≤ TA ≤ 85°C, GND = 0 V, unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted.
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FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION Advanced microprocessor-based systems require compact, efficient, and accurate point-of-load (PoL) power supplies. These PoL supply high current and fast transient response capability while maintaining regulation accuracy. Voltage monitoring (power sequencing) and increased operating frequency are also key features for PoL power supplies.
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FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION POWER GOOD OUTPUT SIGNAL (PG) enhance the gate of the high side Power MOSFET during switching. SHUTDOWN INPUT (SD) If this pin is tied to the GND pin, the device will be in Shutdown mode. If left unconnected or tied to the VIN pin, the device will be in Normal mode. The pin has an internal pullup of 1.5 MΩ. This is an active low open drain output that is used to report the status of the device to a host.
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FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION threshold, this block will alert the system control for further commands. • Output over-voltage and under-voltage monitoring: This block monitors the buck converter output voltage to ensure it is within regulation boundaries. If not, this block alerts the system control for further commands. CONTROL AND SUPERVISORY FUNCTIONS This block is used to interface with an outside host.
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FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES VIN < 3.0 V SD = 0 Shutdown VOUT = Discharge VREF = Discharge PG = 1 Power Off VOUT=OFF VREF=OFF PG = 1 3.0 V<=VIN<=6.
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FUNCTIONAL DEVICE OPERATION PROTECTION AND DIAGNOSTIC FEATURES output signal low after a 10 ms reset delay, to indicate to the host that the device is in normal operation. PROTECTION AND DIAGNOSTIC FEATURES The 34713 monitors the application for several fault conditions to protect the load from overstress. The reaction of the IC to these faults ranges from turning off the outputs to just alerting the host that something is wrong.
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TYPICAL APPLICATIONS TYPICAL APPLICATIONS BOOT VIN Compensation Network C15 0.1 μF VDDI PVIN VOUT SW R2 12.7 k 3 R13 10 k_nopop PGOOD LED VMASTER VMASTER R8 10 k 4 PG x VIN 5 6 SD R7 1k PVIN PVIN 19 PVIN SW FREQ ILIM SW MC34713 PG SW NC GND SD 8 9 10 11 18 17 SW 16 SW 15 14 GND 13 GND 12 VREFIN C13 0.1 μF D1 LED R9 10 k INV C11 0.1 μF COMP C12 0.1 μF LED VOUT I/O Signals VIN Capacitors Jumpers 4.
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TYPICAL APPLICATIONS COMPONENT SELECTION SWITCHING FREQUENCY SELECTION The switching frequency defaults to a value of 1.0 MHz when the FREQ pin is grounded, and 200 kHz when the FREQ pin is connected to VDDI. Intermediate switching frequencies can be obtained by connecting an external resistor divider to the FREQ pin. The table below shows the resulting switching frequency versus FREQ pin voltage. Table 5. Switching Frequency Adjustment FREQUENCY VOLTAGE APPLIED TO PIN FREQ 200 2.341 – 2.500 253 2.
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TYPICAL APPLICATIONS CBOOT BOOT Gate Driver FSW In order to find the maximum allowed ESR, SW L VOUT RF + – Ramp Generator CX Error Amplifier + – The effects of the ESR is often neglected by the designers and may present a hidden danger to the ultimate supply stability. Poor quality capacitors have widely disparate ESR value, which can make the closed loop response inconsistent.
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TYPICAL APPLICATIONS stay enhanced. A 0.1 μF capacitor is a good value for this bootstrap element. LAYOUT GUIDELINES ⇒ Equating the Pole 2 to 5 times the Crossover Frequency to achieve a faster response and a proper phase margin, 5 • F CROSS = F 1 ---------------------------------------P2 = CF CX 2π • R F --------------------CF + CX ⇒ BOOTSTRAP CAPACITOR The bootstrap capacitor is needed to supply the gate voltage for the high side MOSFET.
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TYPICAL APPLICATIONS VIN1 VIN2PVIN and 3 Loop Curr ent HS ON HS SW3 SW2 and SW1 SD Loop Curr ent HS ON HS Loop Current SD ON Loop Current LS ON LS GND2 and 3 PGND BUCK CONVERTER 1 BuckCONVERTER Converter BUCK 2 and 3 Figure 10. Current Loops SOFT START SELECTION Table 6 shows the voltage that should be applied to the terminal ILIM to get the desired configuration of the soft start timing. Table 6. ILIM Table Soft Start (ms) Voltage Applied to ILIM 3.2 1.25 - 1.49 1.6 1.50 - 1.81 0.8 1.
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PACKAGING PACKAGING DIMENSIONS PACKAGING PACKAGING DIMENSIONS EP SUFFIX 24-PIN 98ARL10577D ISSUE B 34713 20 Analog Integrated Circuit Device Data Freescale Semiconductor
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PACKAGING PACKAGING DIMENSIONS EP SUFFIX 24-PIN 98ARL10577D ISSUE B 34713 Analog Integrated Circuit Device Data Freescale Semiconductor 21
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REVISION HISTORY REVISION HISTORY REVISION DATE DESCRIPTION OF CHANGES 1.0 2/2006 • • Pre-release version Implemented Revision History page 2.0 11/2006 • • • Initial release Converted format from Market Assessment to Product Preview Major updates to the data, form, and style 3.
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