34727--Datasheet/数据表在线中文翻译

Document Number: 34727

Rev. 1.0, 5/2008

Freescale Semiconductor

Advance Information

600mA High Efficiency Low

Quiescent Current Synchronous

Buck Regulator With Z-mode

34727

The 34727 is a high efficiency, low quiescent current (I_Q),

synchronous buck regulator, implementing Freescale’s innovative

Z-mode architecture. Freescale’s Z-mode architecture greatly

improves the ripple performance during light load currents, but still

maintains a low quiescent current of 65µA, at no load in “Sleepy” Z-

mode.

POWER MANAGEMENT IC

The 34727 accepts an input voltage in the range of 2.7 to 5.5V,

making it ideally suited for single cell Li-Ion based applications. Factory

preset output voltages, ranging from 0.8 to 3.3V, reduce the number of

required auxiliary components. The part is able to provide 600mA of

continuous load current across the input and the output voltage ranges.

Bottom View

FC SUFFIX (PB-FREE)

98ASA10787D

8-PIN UDFN

2X2

The 34727 switches at 2.0MHz to allow the use of small surface

mount inductors and capacitors, to save precious board space.

The 34727 is available in the small, space saving, and low cost, 2x2

UDFN-8 packages. The part is guaranteed for operation over the -25°C

to +85°C temperature range.

ORDERING INFORMATION

Temperature

Device

Package

Range (T )

A

MC34727AFC/R2

MC34727BFC/R2

MC34727CFC/R2

Features

-25°C to 85°C

8-UDFN

• 94% peak efficiency

• 2.0MHz switching frequency

• Automatic transition to energy saving light load Z-mode (low ripple)

• 2.7V to 5.5V input voltage range

• Fixed output voltage options from 0.8V to 3.3V

• 65µA quiescent current during sleepy Z-mode

• 600mA maximum continuous output current

• Internal 2.0ms soft start

• Thermal and over-current protection

• 0.1µA quiescent current in shutdown (disabled)

• Ultra thin 2x2 UDFN package

• Pb-free packaging designated by suffix code FC

34727

L1

2.7V ~ 5.5V

0.8 - 3.3V *

600mA

VIN

EN

SW

FB

C_IN

C_OUT

ON

OFF

GND

*Programmable

See table 1

Figure 1. 34727 Typical Operating Circuit

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

DEVICE VARIATIONS

Table 1. Device Variations

Freescale Part No.

MC34727AFC

MC34727BFC

MC34727CFC

Notes

V_INRange

Output Voltage⁽¹⁾

Maximum Load Current Switch Frequency (MHz)⁽²⁾

2.7 - 5.5V

3.6 - 5.5V

1.2V

1.8V

3.3V

600mA

2.0

1. Output voltages of: 0.8V, 0.9V, 1.0V, 1.1V, 1.3V, 1.4V, 1.5V, 1.85V, 2.0V, 2.5V options available on request. Contact Freescale sales.

2. Factory programmable at 2.0MHz or 4.0Mhz. Contact Freescale sales for availability of the 4.0MHz functionality.

MC34727

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INTERNAL BLOCK DIAGRAM

EN

VIN

Osc.

Internal

Regulator

–

+

–

Buck

Controller

+

VIN

Ref.

FB

Thermal

Shutdown

SW (2)

Current

Limit

PWM

Ref.

UVLO

–

+

Soft Start

NC

Figure 2. MC34727 Simplified Internal Block Diagram

GND (2)

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PIN CONNECTIONS

VIN

GND

EN

SW

NC

FB

1

2

3

4

8

7

6

5

Transparent

Top View

2x2 UDFN-8 (Non EP)

Figure 3. MC34727 Pin Connections

Table 2. MC34727 Pin Definitions

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

Definition

1

2

3

4

5

6

7

8

VIN

GND

EN

Power input

Input

Ground

Input

Supply Voltage Input

Ground

Low noise ground

Active high enable input

Ground

Enable

FB

Feedback of the output voltage

Input

Feedback Input

No Connection

Switching Node

NC

Internally not connected. Connect to GND externally

This terminal connects to the output inductor

N/A

SW

Output

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ELECTRICAL CHARACTERISTICS

MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

MAXIMUM RATINGS

Table 3. 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

ELECTRICAL RATINGS

All pins voltages

V

V_IN, V_EN, V_FB

V_SW

,

-0.3 to 6.0

ESD Voltage⁽¹⁾

V_ESD

Human Body Model (HBM)

Machine Model (MM)

±2000

±200

THERMAL RATINGS

Operating Ambient Temperature Range

Storage Temperature Range

°C

T_A

T_STG

T_PPRT

T_J

-25 to +85

-25 to +150

Note 3

Maximum Lead Temperature^(2),(3)

Junction Temperature

Operating Junction Temperature

Maximum Junction Temperature

125

+150

Thermal Resistance⁽⁴⁾

Junction-to-Case

°C/W

W

R_θJC

R_θJA

104

122

Junction-to-Ambient

Power Dissipation

P_D

Continuous (Derate 3.0mW/°C and over T_A= 70°C)

0.5

Notes

1. ESD testing is performed in accordance with the Human Body Model (HBM) (C_ZAP= 100pF, R_ZAP= 1500Ω), and the Machine Model

(MM) (C_ZAP= 200pF, R_ZAP= 0Ω).

2. 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.

3. Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow

Temperature and Moisture Sensitivity Levels (MSL). Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes

and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics.

4. Device mounted on the Freescale EVB test board per JEDEC DESD51-2.

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ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

Table 4. Static Electrical Characteristics

Characteristics noted under conditions; 2.7V ≤ V_IN≤ 5.5V, 0.8V ≤ V_OUT≤ 3.3V, -25^oC ≤ T_A≤ 85^oC, C_IN= C_OUT= 4.7µF,

L1 = 4.7µH (See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions;

T_A= +25^oC, V_IN= 3.6V, f_SW= 2.0MHz with the typical operating circuit (See Figure 1), unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

Supply Voltage

V_IN

V_OUT

I_OUT

I_DIS

2.7

0.8

-

5.5

3.3

-

V

Output Voltage (Factory preset)

Output Current

600

mA

µA

Total Supply Current⁽⁵⁾

Regulator disabled

-

0.1

65

1.0

85

Quiescent Current (Switching)

Sleepy Z-mode and I_LOAD= 0mA

I_Q

µA

Current Limit

I_PK

mA

V_OUT

V

Current rising at high side

-

900

-

Output Voltage Accuracy (% of output voltage)

Over load and temperature

∆V_OUT

-3%

3%

UVLO Threshold⁽⁶⁾

V_IN: 2.7 -5.5V

V_INrising

V_UVLO

-

2.7

-

2.5

V_INfalling

Enable Voltage

V_EN

V

Regulator operating

Regulator shutdown

1.6

-

0.4

High Side Power MOSFET On Resistance

R_DS(ON)H

mΩ

%

V_IN= 3.6V, V_OUT= 1.8V, T_A= 40°C, I_LOAD= 150mA

-

250

350

0.5

3%

-

Low Side Power MOSFET On Resistance

R_DS(ON)L

V_IN= 3.6V, V_OUT= 1.8V, T_A= 40°C, I_LOAD= 150mA

Load Regulation

∆V_OUT/∆I_OUT

∆V_OUT/∆V_IN

V_STO

1.0mA < I_LOAD< 600mA and V_OUT= 1.8V

Line Regulation

%

V_IN= 2.7V to 5.5V

Start-up Overshoot (% of output voltage)

V_OUT

I_LOAD= 0mA, V_OUT= 1.8V and C_OUT= 4.7µF

Thermal Shutdown Threshold (Junction Temperature)

Thermal Shutdown Hysteresis (Junction Temperature)

T_STDN

-

140

10

-

°C

T_HYSTR

Notes

5. Maximum I_DISmeasured at V_IN= 3.6V and T_A= 25°C.

6. For a product with a V_OUTof 3.3V and a V_INminimum less than 3.6V, the V_OUTvalue will track (drop below 3.3V) V_INdown to a value

of 2.5V, where the UVLO shutdown mechanism will activate.

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ELECTRICAL CHARACTERISTICS

DYNAMIC ELECTRICAL CHARACTERISTICS

Table 5. Dynamic Electrical Characteristics

Characteristics noted under conditions; 2.7V ≤ V_IN≤ 5.5V, 0.8V ≤ V_OUT≤ 3.3V, -25^oC ≤ T_A≤ 85^oC, C_IN= C_OUT= 4.7µF,

L1 = 4.7µH(See Figure 1), unless otherwise noted. The typical specifications are measured at the following conditions;

T_A= +25^oC, V_IN= 3.6V, f_SW= 2.0MHz with the typical operating circuit (See Figure 1), unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

Switching Frequency⁽⁷⁾

f_SW

1.8

2.0

2.2

MHz

%

Maximum Duty Cycle⁽⁸⁾

Measured from SW pin

D_MAX

95

-

100

-

Internal Soft-start Timer

V_OUTRise Time

t_S

ms

2.0

Notes

7. f_SWcan be factory programmed to ±20% of nominal 2.0MHz.

8. The maximum duty limits the range of output voltages achievable for a given input voltage.

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ELECTRICAL CHARACTERISTICS

ELECTRICAL PERFORMANCE CURVES

100

80

V_EN(10V/DIV)

Time: 500µs/DIV

V_OUT(200mV/DIV)

60

40

V_IN=2.7V

20

V_IN=3.6V

I_L(200mA/DIV)

V_IN=5.5V

0

0.1

1

10

100

1000

I_LOAD(mA)

Figure 4. Efficiency vs. Load Current

V_IN= 3.6V, V_OUT= 1.2V, T_A=25^oC

Figure 7. Start-up Response

I

_LOAD= 0mA, V_OUT=1.2V

V_OUT(1V/DIV)

V_SW(2V/DIV)

Time: 100µs/DIV

0.4

0.0

-0.4

-0.8

-1.2

I_LOAD=0mA

I_LOAD=100mA

I_LOAD=600mA

I_L(100mA/DIV)

3

4

5

V_IN(V)

Figure 8. Sleepy Z-mode Switching Waveforms

V_IN= 3.6V, V_OUT= 1.2V and I_LOAD= 1.0mA

Figure 5. Line Regulation

V_INis 2.7V to 5.5V and V_OUTis 1.2V

1

V_OUT(1V/DIV)

V_SW(2V/DIV)

Time: 2µs/DIV

0

-1

-2

-3

-4

V_IN=2.7V

V_IN=3.6V

V_IN=5.5V

I_L(100mA/DIV)

0.0

0.2

0.4

0.6

I_LOAD(A)

Figure 6. Load Regulation

1.0mA < I_LOAD< 600mA, V_OUT= 1.2V

Figure 9. Z-mode Switching Waveforms

V_IN= 3.6V, V_OUT= 1.2V and I_LOAD= 10mA

MC34727

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ELECTRICAL CHARACTERISTICS

ELECTRICAL PERFORMANCE CURVES

V

_OUT(AC Coupled, 100mV/DIV)

Time: 200µs/DIV

V_OUT(1V/DIV)

V_SW(2V/DIV)

Time: 500ns/DIV

V_SW(2V/DIV)

I_L(100mA/DIV)

I

_LOAD(500mA/DIV)

Figure 10. CCM Switching Waveforms

_IN= 3.6V, V_OUT= 1.2V and I_LOAD= 300mA

Figure 12. Load Transient in Z-mode

_IN= 3.6V, I_LOAD=10mA to 600mA

V

V_OUT(AC Coupled, 100mV/DIV)

V_SW(2V/DIV)

Time: 200µs/DIV

V_OUT(AC Coupled, 100mV/DIV)

V_SW(2V/DIV)

Time: 200µs/DIV

I_LOAD(200mA/DIV)

I

_LOAD(200mA/DIV)

Figure 13. Load Transient in CCM

_IN= 3.6V, I_LOAD= 300mA to 600mA

Figure 11. Load Transient in Sleepy Z-mode

_IN= 3.6V, I_LOAD=1.0mA to 300mA

V

MC34727

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Freescale Semiconductor

9

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 34727 is a high efficiency, synchronous, buck

regulator, utilizing a voltage mode control architecture with

feed forward. It is capable of providing a 600mA load current

for output voltages of 0.8V to 3.3V, from a single input voltage

rail between 2.7V and 5.5V.

In a buck converter, most of the losses at high output loads

are due to conduction losses in the power train, but at light

output loads, the conduction losses are reduced and most of

the losses become switching losses. Using Freescale’s Z-

mode architecture, the 34727, at light output loads, will

smoothly transition into a lower switching frequency, thus

improving its efficiency.

FUNCTIONAL PIN DESCRIPTION

SUPPLY VOLTAGE INPUT (VIN)

FEEDBACK INPUT (FB)

2.7V to 5.5V DC power input. Bypass with a 4.7µF ceramic

Feedback of the output voltage.

capacitor as close as possible to the VIN and GND pins.

SWITCHING NODE (SW)

GROUND (GND)

This terminal connects to the output inductor. The node

internally connects the drain of both the high side MOSFET

and the low side MOSFET.

Ground.

ENABLE (EN)

NO CONNECTION (NC)

Active high enable input. EN is over-voltage protected to

6.0V, independent of the supply voltage. Drive with a logic

high signal (or connect to VIN) for normal operation. Drive

with a logic low signal, or connect to GND will disable the

34727.

Internally not connected. Connect to GND externally.

MC34727

Analog Integrated Circuit Device Data

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FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

MC34727 - Functional Block Diagram

Integrated Supply

Internal Regulator & Reference

Oscillator

Control

Power MOSFET

Soft Start

Thermal Shutdown

Undervoltage Lockout

Current Limit

Power MOSFET Driver

Integrated Supply

Oscillator

Control

MOSFET

Figure 14. MC34727 Functional Internal Block Diagram

independent of input voltage, output voltage, or load current.

INTEGRATED SUPPLY

The soft-start sequence also occurs upon recovery from any

fault condition.

INTERNAL REGULATOR AND REFERENCE

UVLO

The internal regulator and reference block steps down the

high input voltage to lower voltage, to power all the internal

blocks, and provides the reference voltage for the other

internal blocks.

The UVLO block monitors the input voltage. Once the

input voltage is lower than the falling threshold voltage, this

block turns off the device, to avoid unpredictable circuit

behavior.

OSCILLATOR

CURRENT LIMIT

The current limit block monitors the inductor current. When

the peak inductor current reaches its current limit, this block

turns off the high side MOSFET, to prevent the device and

external components from damage.

The oscillator block provides 2.0MHz clock signal to the

controller.

CONTROL

POWER MOSFET DRIVER

THERMAL SHUTDOWN

The power-MOSFET driver block controls the phase of the

diver signals, and enhances the drive capability of these

signals.

The thermal shutdown block monitors the die temperature.

Once the die temperature reaches its threshold, this block

turns off the device to prevent the further die temperature

rise.

POWER-MOSFET

The power-MOSFET block contains two power

SOFT-START

MOSFETs. One is a PMOS that passes the current from the

input to the output, and the other is an NMOS that provides

the inductor current loop when PMOS is turned off.

The soft-start block controls the output voltage ramp after

the device is enabled, to limit the in-rush current. The start-up

time is internally set to approximately 2.0ms, and is

MC34727

Analog Integrated Circuit Device Data

Freescale Semiconductor

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FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

below 85% of the CCM duty cycle. As the load decreases,

Z-MODE OPERATION

this pulse skipping reduces the switching frequency and the

switching losses thus improving efficiency. For example, if a

light load demanded a 30% duty cycle at 2.0MHz, with Z-

mode, this same load will require only

The 34727 operates as a typical fixed frequency, PWM

regulator, at moderate to heavy load currents. As the load is

decreased, such that operation transitions from continuous

conduction mode (CCM) to discontinuous conduction mode

(DCM), the duty cycle is reduced until it approaches 85% of

the full load duty cycle. At this point, the 34727 transitions into

Z-mode operation, where the Z-mode Factor is 0.85. In Z-

mode, the regulator skips pulses whenever the duty cycle is

(0.3/0.85)²x 2.0MHz = 0.249MHz switching frequency,

hence switching losses will be reduced by almost ten fold.

Figure 15 illustrates the transition to and the exit from Z-

mode.

V

ZERR

V

RAMP

PWM

PWM_Ref.

Z Factor

SW

On Time

Figure 15. Z-mode Operation

internal circuit blocks to lower the device’s quiescent current.

Additionally, the oscillator frequency drops to 250kHz and the

low side switch is turned off, to emulate the operation of an

asynchronous buck converter.

SLEEPY Z-MODE OPERATION

To improve low current efficiency, the 34727 transitions

into the Sleepy Z-mode at load currents of approximately

1.0mA and lower. This is accomplished by powering down

DETAILED FUNCTIONAL DEVICE OPERATION

OVER-CURRENT PROTECTION

SHORT-CIRCUIT PROTECTION

The 34727 implements two layers of protection during

overload conditions. The first is a current limit feature to

prevent the device and external components from damage.

When the peak inductor current reaches the over-current

limit, nominally 900mA, the high side MOSFET turns off to

provide cycle by cycle protection. If the over-current condition

persists and the die temperature surpasses the over-

temperature protection (OTP) threshold, this second layer of

protection shuts down the device.

When a short-circuit condition occurs on the output, typical

regulators will tend to operate at maximum duty cycle. This

condition can saturate the inductor and produce severe peak

currents, resulting in damage to the device. The 34727

avoids this scenario by detecting output voltages below 0.5V.

Upon detection, the part re-starts continuously until the short

circuit condition is removed, or the part surpasses its OTP

threshold.

MC34727

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Freescale Semiconductor

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FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

The soft-start sequence also occurs upon recovery from any

fault condition.

OVER-TEMPERATURE PROTECTION

To limit its operating temperature, the 34727 shuts down if

the junction temperature of the switching MOSFET

surpasses 140°C. If the junction temperature subsequently

drops to 130°C, the 34727 re-starts.

UNDER-VOLTAGE LOCK-OUT

The UVLO threshold is set to 2.7V for rising V_IN, and to

2.5V for falling V_IN. For a V_OUTof 3.3V, the V_OUTvalue will

track V_INbelow 3.6V until the 2.5V falling V_INthreshold is

reached.

SOFT-START OPERATION

To limit the in-rush current, an internal timer controls the

output voltage ramp after the part is enabled. The start-up

time is internally set to approximately 2.0ms and is

If the UVLO falling threshold is met, the part shuts down

and will power up again with soft-start, when the UVLO rising

threshold is surpassed.

independent of input voltage, output voltage, or load current.

MC34727

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TYPICAL APPLICATIONS

APPLICATION INFORMATION

TYPICAL APPLICATIONS

APPLICATION INFORMATION

Depending on the load transient current, a larger capacitance

may be required.

INPUT CAPACITOR

The input capacitor is used to minimize the input voltage

transient that may cause instability when the load transient

current is high. Typically a 4.7µF X5R ceramic capacitor is

sufficient for most applications.

INDUCTOR SELECTION

A 4.7µH low DC resistance inductor is typically used for

the 34727 to guarantee the system stable operation.

OUTPUT CAPACITOR

For stable operation and low output voltage ripple, an X5R

ceramic capacitor of 4.7µF minimum value is needed.

TYPICAL APPLICATIONS

connects to the output directly for monitoring the output

voltage. Normally, the EN pin connects to the input supply

directly to enable the regulator.

1.8V OUTPUT DC/DC CONVERTOR

Figure 16 shows a typical application using 34727B. C_IN

and C_OUTare typically 4.7µF/X5R ceramic capacitors. L1 is

typically a 4.7µH low DC resistance inductor. The FB

34727B

L1

2.7V ~ 5.5V

1.8V

600mA

VIN

EN

SW

4.7µH

C_IN

4.7µF

FB

C_OUT

4.7µF

ON

OFF

GND

Figure 16. 1.8V/600mA DC/DC convertor

MC34727

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Freescale Semiconductor

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TYPICAL APPLICATIONS

PACKAGE DIMENSIONS

For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below.

EP SUFFIX

8-PIN

98ASA10787D

REVISION A

MC34727

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Freescale Semiconductor

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TYPICAL APPLICATIONS

PACKAGE DIMENSIONS

EP SUFFIX

8-PIN

98ASA10787D

REVISION A

MC34727

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Freescale Semiconductor

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TYPICAL APPLICATIONS

PACKAGE DIMENSIONS

EP SUFFIX

8-PIN

98ASA10787D

REVISION A

MC34727

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Freescale Semiconductor

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REVISION HISTORY

REVISION

DATE

DESCRIPTION OF CHANGES

• Initial Release

5/2008

1.0

MC34727

Analog Integrated Circuit Device Data

Freescale Semiconductor

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34727

Rev. 1.0

5/2008