SP6659EK1-1.8-L/TR_技术文档

®

Preliminary

SP6659

1.5MHz, 600mA Synchronous Buck Regulator

FEATURES

V

IN

FB

IN

OUT

■ 94% Efficiency Possible

5

4

5

4

■ 600mA Output Current at V_IN= 3.6V

■ 2.5V to 5.5V Input Voltage Range

■ 1.5MHz constant frequency operation

■ No Schottky Diode Required

■ Output Voltages as low as 0.6V

■ Slope Compensated Current Mode

Operation for Excellent Line and Load

Transient Response

■ 100 % Duty Cycle in LDO Mode

■ <1µA Shutdown Current, Quiescent

Current of 300 µA

■ Over-temperature protected

■ Pin Compatible to LTC3406B

■ Offered in Low Profile TSOT-23

package

SP6659

5 Pin TSOT-23

SP6659

5 Pin TSOT-23

1

2

3

1

2

3

SW

RUN

GND

RUN

GND

Adjustable

Fixed

Now Available in Lead Free Packaging

APPLICATIONS

■ Cell Phones

■ Wireless and DSL Modems

■ DSC's

■ Portable Instruments

DESCRIPTION

The SP6659 is a 600mA synchronous buck regulator using a constant frequency, current mode

architecture. The output voltage can be programmed using an external resistor divider. The 2.5V

to 5.5V input voltage range is ideal for portable applications that use a Li-Ion battery. Switching

frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and

capacitors. The internal synchronous switch increases efficiency and eliminates the need for an

external Schottky diode. The output voltage can be programmed using an external resistor

divider. Low output voltages are easily supported with the 0.6V feedback reference voltage. The

SP6659 is available in a low profile 5 pin TSOT-23 package.

TYPICAL APPLICATION SCHEMATICS

®

2.2µH

SW

V

SW

V

3

4

1

SP6659

V

3

OUT

V

4

1

IN

OUT

IN

Cf

SP6659

100pF

R1

R2

RUN

4.7µF

Ceramic

10µF

Ceramic

4.7µF

Ceramic

10µF

Ceramic

OUT

5

FB

5

2

GND

Adjustable

Fixed

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

1

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the

specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

Input Supply Voltage ......................................................... -0.3V to +6V

RUN, V_FBVoltages .................................................. -0.3V to (V_IN+ 0.3V)

SW Voltage ............................................................ -0.3V to (V_IN+ 0.3V)

P-Channel Switch Source Current (DC) ..................................... 800mA

N-Channel Switch Sink Current (DC) ......................................... 800mA

Peak Switch Sink and Source Current ........................................... 1.3A

Operating Temperature ................................................. -40°C to +85°C

Storage Temperature ................................................. -65°C to +150 °C

Junction Temperature (Note 1) .................................................. 125 °C

Lead Temperature (Soldering, 10 sec) ....................................... 300 °C

ELECTRICAL CHARACTERISTICS

___________________________ THERMAL

RESISTANCE

Thermal Resistance is specified with approximately 1 square inch of 1 ounce copper.

O_JA................................................................220°C/W

O_JC...............................................................110°C/W

V

IN = VRUN = 3.6V, Io = 0mA, TAMB = -40ºC to +85ºC, typical values at 25ºC unless otherwise noted.

The ♦ denotes the specifications which apply over the full operating temperature range, unless otherwise specified.

PARAMETER

Input Voltage Range

Input DC Supply Current

Active Mode

MIN

TYP

MAX

UNITS

CONDITIONS

♦

2.5

5.5

V

300

0.1

400

1

µA

V

FB = 0.5V, VIN = VRUN

Shutdown Mode

IN = 3.6V, VRUN = ZeroV

0.5880 0.6000 0.6120

0.5865 0.6000 0.6135

0.5820 0.6000 0.6180

T

A

= +25ºC

0ºC < T < +85ºC

-40ºC < T < +85ºC

V

FB (Feedback Voltage)

V

A

♦

A

V

FB Input Bias Current

FB Line Regulation

FB Load Regulation

85

300

1

nA

%/V

%/mA

V

FB = 1.0V

IN = 2.5V to 5.5V

♦

-1

-0.1

1.455

1.746

0.6

0.4

0.01

1.500

1.800

0.1

ILOAD = 0mA to 600mA

1.545

1.854

SP6659EK1-1.5, -40ºC < T

SP6659EK1-1.8, -40ºC < T

A

< +85ºC

Regulated Output Voltage

V

Minimum Output Voltage

Peak inductor current

Oscillator frequency

V

0.7

1.0

1.4

0.4

1.2

1.8

0.6

A

VFB = 0.5V, VIN = 2.5V

♦

0.8

mHz

Ω

Closed Loop, I^LOAD= 100mA

I_SW= 100mA

P-channel ON resistance

N-channel ON resistance

Ω

I_SW= -100mA

V

IN = 3.6V, VRUN = ZeroV,

SW Leakage Current

0.01

1.0

µA

Vsw = ZeroV, Vsw = V^IN

♦

Run Threshold Voltage

Run Leakage Current

0.2

1

1.3

1.5

V

0.01

µA

Note 1: Junction Temperature T_Jis calculated from the ambient temperature TA and ower dissipation P_D

according to the following formula: T_J= T_A+ P_DX 220°C/W

PIN DESCRIPTION

PIN #

PIN NAME

DESCRIPTION

Power down control pin. Forcing this pin above 1.5V enables the device. Forcing this

pin below 0.3V shuts down the device.

1

RUN

2

3

4

GND

SW

V_IN

Ground pin.

Switching node.

Power supply pin

Adjustable Version: VFB, Feedback Input Pin. Connect FB to the center point of the

external resistor divider. The feedback threshold voltage is 0.6V.

5

V_FB/ V_OUT

Fixed Output Version: V^OUT,Output Voltage Feedback Pin. An internal resistive

divider drops the output voltage down for comparison to the internal reference voltage.

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

2

TYPICAL PERFORMANCE CHARACTERISTICS

Refer to the typical application schematic, V_OUT= 1.8V, T_AMB= +27°C

20µS/div

Figure 1: Load Transient 0mA to 600mA

CH 1: Output Voltage, 100mV per division AC-Coupled

CH 3: Load Current, 500mA/ div

Figure 2: Load Transient 50mA to 600mA

CH 1: Output Voltage, 100mV per division AC-Coupled

CH 3: Load Current, 500mA/ div

CH 4: Inductor Current, 500mA/ div

20µS/div

Figure 3: Load Transient 100mA to 600mA

CH 1: Output Voltage, 100mV per division AC-Coupled

CH 3: Load Current, 500mA/ div

Figure 4: Load Transient 200mA to 600mA

CH 1: Output Voltage, 100mV per division AC-Coupled

CH 3: Load Current, 500mA/ div

CH 4: Inductor Current, 500mA/ div

1µS/div

40µS/div

Figure 5: Discontinuous Mode

Figure 6: Startup from Shutdown

CH 1: RUN pin 2V/div.

CH 2: Vout 1V/div, AC-Coupled

CH 3: Inductor Current, 500mA/ div

CH 1: Output Voltage, 10mV per division AC-Coupled

CH 2: SW 2V/div

CH 3: Inductor Current, 500mA/ div

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

3

TYPICAL PERFORMANCE CHARACTERISTICS

Refer to the typical application schematic, V_OUT= 1.8V, T_AMB= +27°C

1.8Vout Load Regulation

1.8Vout Efficiency Vs Output

1.830

1.820

1.810

1.800

1.790

100

90

Vin=4.2V

Vin=3.3V

Vin=2.7V

80

70

60

50

Vin=2.7V

Vin=3.3V

Vin=4.2 V

40

0

100

200

300

400

500

600

700

1

10

100

1000

Output Current (mA)

Figure 8: Load Regulation Vout =1.8V

Figure 7: Efficiency Vs. Load Current, Vout =1.8V

1.8Vout Efficiency vs Input voltage

Output Voltage vs Load Current

100

1.850

95

90

85

80

75

70

1.840

Vin=3.3V

1.830

1.820

1.810

1.800

1.790

1.780

1.770

1.760

1.750

65

Iout=600mA

60

Iout=100mA

55

Iout=10mA

50

2

3

4

5

6

0

200

400

600

800

1000

1200

Input Voltage (V)

Figure 9: 1.8Vout Efficiency vs. Input Voltage

Figure 10: Output Voltage vs. Load Current

Supply Current vs Supply Voltage

Oscillator Frequency vs Supply Voltage

400

1.6

380

360

340

320

1.5

1.4

300

280

260

Vo=1.8V

Iload=600mA

1.3

Vo=1.8V

Iload=0A

240

220

1.2

200

2

3

4

5

6

2

3

4

5

6

Input Voltage (V)

Figure 12: Oscillator Frequency vs. Supply Voltage

Figure 11: Supply Current vs. Supply Voltage

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

4

TYPICAL PERFORMANCE CHARACTERISTICS

Refer to the typical application schematic, V_OUT= 1.8V, T_AMB= +27°C

2.5Vout Efficiency Vs Output Current

2.5Vout Load Regulation

100

90

80

70

60

50

40

2.520

2.510

2.500

2.490

2.480

Vin=4.2V

Vin=3.3V

Vin=2.7V

Vin=3.3V

Vin=4.2V

0

100

200

300

400

500

600

700

1

10

100

1000

Output Current (mA)

Figure 14: Load Regulation Vout =2.5V

Figure 13: Efficiency Vs. Load Current, Vout =2.5V

1.5Vout Load Regulation

1.5Vout Efficiency Vs Output Current

1.520

100

Vin=4.2V

Vin=3.3V

Vin=2.7V

90

80

70

1.510

1.500

1.490

1.480

60

Vin=2.7V

Vin=3.3V

Vin=4.2V

50

40

0

100

200

300

400

500

600

700

1

10

100

1000

Output Current (mA)

Figure 16: Load Regulation Vout =1.5V

Figure 15: Efficiency Vs. Load Current, Vout =1.5V

1.2Vout Efficiency Vs Output Current

1.2Vout Load Regulation

1.230

100

Vin=4.2V

Vin=3.3V

Vin=2.7V

90

80

70

1.220

1.210

1.200

1.190

60

Vin=2.7V

Vin=3.3V

Vin=4.2V

50

40

0

100

200

300

400

500

600

700

1

10

100

1000

Output Current (mA)

Figure 17: Efficiency Vs. Load Current, Vout =1.2V

Figure 18: Load Regulation Vout =1.2V

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

5

FUNCTIONAL DIAGRAMS

V

IN

SLOPE

COMP

OSC

4

2.7 - 5.5V

+

-

CIN

+

SENSE

COMP

-

BLANKING

I

R

_

S

_

Q

_

Q

+

VOUT

R

0.6V

+

EA

-

COMP

-

RS LATCH

SW

5

VOUT

PWM

LOGIC

DRV

3

R1

+

OV

DET

-

0.65V

R2

COUT

+

V

IN

Izero

COMP

-

2

RUN

GND

0.6V

REF

1

SHUTDOWN

Fixed Output Version

V

IN

SLOPE

COMP

OSC

4

2.7 - 5.5V

+

-

C

IN

+

SENSE

COMP

-

BLANKING

I

R

_

S

_

Q

_

Q

+

R

V

FB

0.6V

+

COMP

-

EA

RS LATCH

SW

5

-

V

OUT

PWM

LOGIC

DRV

3

2

+

OV

DET

-

Cf

R1

0.65V

COUT

+

R2

VIN

Izero

COMP

-

RUN

GND

0.6V

REF

1

SHUTDOWN

Adjustable Output Version

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

6

APPLICATION INFORMATION

V

OUT

®

R1

A resistive divider based on the following

equation determines the output voltage:

V

FB

SP6659

R2

R1

R2

GND

V

_OUT= 0.6 (1+

)

The external resistive divider is connected

to the output as shown in Figure 20 .

Figure 20: Setting the SP6659 Output Voltage.

THEORY OF OPERATION

The SP6659 is a monolithic switching mode

Step-Down DC-DC converter. It utilizes in-

ternal MOSFETs to achieve high efficiency

and can generate very low output voltage

by using its internal reference at 0.6V. It

operates at a fixed switching frequency,

andusesslopecompensated,current-mode

architecture. This Step-Down DC-DC con-

verter supplies 600mA of output current at

V_IN= 3V. The entire input voltage range is

from 2.5V to 5.5V.

on immediately and stay on until either the

inductor current starts to reverse, as indi-

cated by the current reversal comparator,

I_ZERO, or the beginning of the next clock

cycle. The OVDET comparator controls

output transient overshoots by turning the

main switch off and keeping it off until the

fault is no longer present.

_______________________ IDLE MODE

OPERATION

__________________ CURRENT MODE

PWM CONTROL

At very light loads, the SP6659 automati-

cally enters Idle Mode (Figure 21).

Slope compensated current mode PWM

control provides stable switching and cycle-

by-cycle current limit for excellent load and

line responses and protection of the internal

main switch (P-Channel MOSFET) as well

as the synchronous rectifier (N-Channel

MOSFET). During normal operation, the in-

ternal P-Channel MOSFET is turned on for

a certain time to ramp the inductor current at

each rising edge of the internal oscillator,

and switched off when the peak inductor

current is above the error voltage. The

current comparator, I_COMP, limits the peak

inductor current. When the main switch is

off, the synchronous rectifier will be turned

Figure 21. SP6659 Idle Mode Operation

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

7

THEORY OF OPERATION

In the Idle Mode, the inductor current may

reach zero Amps or reverse on each pulse.

The PWM control loop will automatically

skip pulses to maintain output regulation.

The bottom MOSFET is turned off by the

current reversal comparator, I_ZERO, and the

switch voltage will ring. This is discontinu-

ous mode operation, and is normal behavior

for the switching regulator.

________________________ MAXIMUM

LOAD CURRENT

The SP6659 will operate with an input sup-

ply voltage as low as 2.5V, however, the

maximum load current decreases at lower

inputs due to a large IR drop on the main

switch and synchronous rectifier. The slope

compensation signal reduces the peak in-

ductor current as a function of the duty cycle

to prevent sub-harmonic oscillations at duty

cycles greater than 50%. Conversely, the

current limit increases as the duty cycle

decreases.

_______________________ DROPOUT

OPERATION

When the input voltage decreases toward

the value of the output voltage, the SP6659

allowsthemainswitchtoremainonformore

than one switching cycle and increases the

duty cycle until it reaches 100%.

_______________________ INDUCTOR

SELECTION

Formostdesigns,theSP6659operateswith

inductors of 1µH to 4.7µH. Low inductance

values are physically smaller but require

faster switching, which can result in some

efficiency loss. The inductor value can be

derived from the following equation:

The duty cycle D of a step-down converter is

defined as:

D = T_ONX ƒ_OSCX 100%

≈ VOUT

X 100%

V_IN

L = VOUT X (VINMax - VOUT)

V_INMaxX ∆I_LX ƒ_OSC

where T_ONis the main switch on time, and

ƒ_OSCis the oscillator frequency (1.5Mhz).

Where ∆I_Lis the inductor Ripple Current.

Large value inductors lower ripple current

and small value inductors result in higher

ripple current. Choose inductors at ripple

current of approximately 35% of the maxi-

mum load current 600mA, or ~ 210mA.

The output voltage then is the input voltage

minus the voltage drop across the main

switch and the inductor. At low input supply

voltage, the R_DSONof the P-Channel

MOSFET increases, and the efficiency of

the converter decreases. Caution must be

exercised to ensure that the heat dissipated

doesnotexceedthemaximumjunctiontem-

perature of the IC.

For output voltages above 2.0V, when light-

load efficiency is important, the minimum

recommended inductor is 2.2µH. For opti-

mum voltage-positioning load transients,

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

8

THEORY OF OPERATION

choose an inductor with DC series resis-

tance in the 50mΩ to 150mΩ range. For

higher efficiency at heavy loads (above

200mA), or minimal load regulation (but

some transient overshoot), the resistance

should be kept below 100mΩ. The DC cur-

rent rating of the inductor should be at least

equal to the maximum load current plus half

the ripple current to prevent core saturation

(600mA+105mA).

________________ INPUT CAPACITOR

SELECTION

The input capacitor reduces the surge cur-

rent drawn from the input and switching

noise from the device. The input capacitor

impedance at the switching frequency shall

be less than input source impedance to

prevent high frequency switching current

frompassingtotheinput.AlowESR(Equiva-

lentSeriesResistance) inputcapacitorsized

for maximum RMS current must be used.

Ceramic capacitors with X5R or X7R dielec-

trics are highly recommended because of

their low ESR and small temperature coeffi-

cients. A 4.7µF ceramic capacitor for most

applications is sufficient.

Table 1 lists some typical surface mount

inductors that meet target applications for

the SP6659.

SP6659 Inductor Selection Chart

Part #

Inductor Max DCR Rated DC Size WxLxH

______________ OUTPUT CAPACITOR

SELECTION

(µH)

(mΩ)

Current

(Amps)

(mm)

Murata

LQH32CN2R2M11

1.0

78

1000

3.2x2.5x1.55

The output capacitor is required to keep the

output voltage ripple small and to ensure

regulation loop stability. The output capaci-

tor must have low impedance at the switch-

ing frequency. Ceramic capacitors with X5R

or X7R dielectrics are recommended due to

their low ESR and high ripple current. The

output ripple ∆V_OUTis determined by:

Murata

LQH32CN2R2M11

2.2

126

790

3.2x2.5x1.55

Murata

4.7

195

650

3.2x2.5x1.55

LQH32CN4R7M11

1.4

2.2

3.3

4.7

1.5

2.2

3.3

4.7

1.5

2.2

3.3

4.7

56.2

71.2

86.2

2.52

1.5

1.44

1.15

Sumida CR43

4.5x4.0x3.5

4.7x4.7x2.0

3.6x3.6x1.2

108.7

75

1.32

1.04

0.84

1.29

1.14

0.98

0.79

Sumida CDRH4D18

Toko D312C

110

162

120

140

180

240

∆V_OUT

≤

Inductor in Bold is used on the SP6659EB evaluation Board

1

V_OUTX (V_INMax- V_OUT

⁾X

+

ESR

{

}

(8X ƒ_OSCX C_OU

)

T

V_INMaxX L X ƒ_OSC

Table 1: Typical Surface Mount Inductors

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

9

PACKAGE: 5 PIN TSOT23

D

e1

5

4

SIDE VIEW

A2

E/2

E1/2

E

E1

A

Seating

Plane

A1

2

3

1

(L1)

Pin1 Designator

to be within this

INDEX AREA

e

b

TOP VIEW

ø1

FRONT VIEW

R1

Gauge Plane

R

L2

ø1

c

Seating

Plane

ø

L

5 Pin TSOT-23

JEDEC MO-193

Variation AB

Dimensions in Inches

Conversion Factor:

1 Inch = 25.40 mm

Dimensions in Millimeters:

Controlling Dimension

SYMBOL

MIN

-

0.00

0.70

0.08

NOM

-

0.90

-

MAX

1.10

0.10

1.00

0.20

MIN

-

0.000

0.028 0.036

0.003

NOM

-

MAX

0.043

0.004

0.039

0.008

A

A1

A2

c

-

D

E

E1

L

2.90 BSC

2.80 BSC

1.60 BSC

0.45

0.114 BSC

0.110 BSC

0.063 BSC

0.30

0.60

0.012 0.018

0.024

L1

L2

Ø

Ø1

R

0.60 REF

0.25 BSC

4º

10º

-

0.024 REF

0.010 BSC

4º

10º

0˚

4˚

0.10

0.30

8º

12º

-

0.25

0.50

0º

4º

0.004

0.012

8º

12º

-

R1

-

0.010

0.020

b

e

e1

0.95 BSC

1.90 BSC

0.038 BSC

0.075 BSC

SIPEX Pkg Signoff Date/Rev:

JL Aug4-05 / Rev A

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

10

ORDERING INFORMATION

Package Type

Part Number

Operating Temperature Range

SP6659EK1 ......... ...............................-40°C to +85°C ...........................................................5 Pin TSOT23

SP6659EK1/TR ...................................-40°C to +85°C ...........................................................5 Pin TSOT23

SP6659EK1-1.5 ...................................-40°C to +85°C ...........................................................5 Pin TSOT23

SP6659EK1-1.5/TR...............................-40°C to +85°C ..........................................................5 Pin TSOT23

SP6659EK1-1.8 ...................................-40°C to +85°C ...........................................................5 Pin TSOT23

SP6659EK1-1.8/TR...............................-40°C to +85°C ..........................................................5 Pin TSOT23

Available in lead free packaging. To order add "-L" suffix to part number.

Example: SP6659EK1/TR = standard; SP6659EK1-L/TR = lead free

/TR = Tape and Reel

Pack quantity is 2,500 for TSOT23.

Corporation

ANALOG EXCELLENCE

Sipex Corporation

Headquarters and

Sales Office

233 South Hillview Drive

Milpitas, CA 95035

TEL: (408) 934-7500

FAX: (408) 935-7600

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the

application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

Date: 08/15/05

SP6659 1.5MHz, 600mA Synchronous Buck Regulator

11


型号：	SP6659EK1-1.8-L/TR
厂家：	SIPEX CORPORATION
描述：	Switching Regulator, Current-mode, 1.3A, 1800kHz Switching Freq-Max, PDSO5, LEAD FREE, SOT-23, 5 PIN 开关光电二极管
文件：	总11页 (文件大小：203K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SP6659EK1-1.8-L/TR [SIPEX]

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