剖析可攜式電源管理電路的工作原理及IC 介紹€¦ ·  · 2005-08-02降壓式轉換器 (Buck converter) 的動作原理及特點

IC

(3G)

(MP3)(GPS)..

IC IC

4.2V~2.7V 270~300

LWh 110~130

KgWh 3.6V

1.25V~1.55V 220~300

LWh 75~100

KgWh 1.5V

IC

1.1V~3.3V 3.3V 3.3V

(LDO)(Charge pump)(Buck converter)

(Single-ended Primary Inductor ConverterSEPIC) (Low-DropoutLDO)

VI >VoVI VoVdrop out = VI - VoVoP

= I VdropoutVdropoutI

(LDO)

25%

IC LM317 LM337 Texas Instrument TPS6

ControlCircuit

OV1R

2R

rV

dsR

LR

_

+

_+ dropoutV

IV

+

_

1. 2. VI =Vout 85%VI >Vout 3. EMI (Audio)(Radio) 4. 5.

110xTPS6112xTPS6113x Linear TechnologyLT1963LTC1705LT1764National Semiconductor LP398X MAXIMMAX886X/887X/888X( Texas Instrument www.ti.com Linear Technology www.linear.comNational Semiconductor www.national.comMAXIMwww.maxim-ic.com)

(Charge pump)

http://www.ti.com/http://www.linear.com/http://www.national.com/http://www.maxim-ic.com/

(Charge pump)(Switched

capac

(Charge pump) IC

(b) D1

D2 C1 Vc1 Vc1 = (Vcc - Vd)

(2) C1 Vc1

(c) D1 D2

C2

itor converter) (Charge pump) IC IC C1,C2(a) NE555 4009UB D1,D2 C1,C2

1C

2C

CCV

CLK

OV_

+

(1)

Vd I

C1 C2 -(Vcc-2Vd)

C1

CCV

1C

2C1D

2D

OV_

+

(a)(Charge pump)

(b)(CLK)

(c)(CLK)

MAXIM

SW7, SW5 (ON)(OFF)C1,C2

1C

2C1D

2D

CCV OV_

+

+ _

I

1CV

1C

2C1D

2D

OV_

+

I

+ _1CV

IC MAX619 IC (1)SW1, SW3

VI

(2)SW2, SW4, SW6 (OFF)

5V20mA 3V 5V, 50mA:

3)VIVoIout(LDO)

VIC1,C2 C4 VoVI 3

rV

1R

2R

SWITCHCONTROL

IV

2C

1C

SW1

SW2

SW3

SW4

SW5

SW6

SW7

OV

3C

4C

+

_

+

_

MAXIM IC MAX619 MAX619 1.8V ~3.6V

Power loss = Iout [(2 3)VI-Vo] (2

(Charge pump) 1.(C pump) . LDO

arge pump) IC Texas Instrument C1682LTC1516/17 MAXIM

/1912/1916 ON semiconductor NCP5603 ( IM

(Buck converter) (a)

(1) VL = VI - Vo(b)

DT 0

90%

(a) (a)

(b)

Driver

LR

IV

L

C OV

+

_

+

_

+ _LV

1Q

2Q

L

LI

t

t

OVIV_

OV_

V

D T (1 D )T_

(b)

1. MOS FET .

. EMI (Lay out)

Vout/ VI )

rter) IC Texas Instrument LT1576 MAXIM

Texas MAXIM )

Q VL1,meanVL2,mean 0

I - VL1,mean- VL2,mean = VI T

23.45.(6.

(Buck conveTPS43000TPS40021Linear Technology LTC3404LTC3713 MAX1970MAX5073 (InstrumentLinear Technology

SEPIC (Single-ended Primary Industry Converter)

CL1VIL2C VC,mean = V

Q D Q L1

DTVI = (1-D) T (Vout +Vd+Vc,mean-VI) = (1-D) T (Vout+Vd)

IV

VdVout + =D1

D

1>D>0.5 IV

VdVout + 0.5>D>0

IVVdVout + < 1SEPIC

4.2V~2.7V 3.3V 10%VI 2.7VSEPIC

3.3V

D

SEPIC

(Charge pump)

(SEPIC) IC Texas Instrument TPS6 MAXIM

(

LDO BUCK SEPIC

1. 2.3. EMI 4. 5.6.

113XUCC39421Linear Technology LT1512LT1513LTC1871 MAX668MAX669 ( Texas InstrumentLinear Technology MAXIM )

[6] ) 600mAh 3.3V~2.7V

LDO

V battery = 4.2 ~ 3.6V 78% 93% 86%

10%(600mAh 10%) 60 60 60mAh mAh mAh

1C 2C

1D

OV

_

+

IV

+

_

1L

2L

C

+ _CV

PWM Q

46.8mAh 55.8mAh 51.6mAh

V battery =3.6 ~ 3.3V 91% 96% 86%

80%(600mAh 80%) 480mAh 480mAh 480mAh

436.8mAh 460.8mAh 412.8mAh

V battery =3.3 ~ 2.7V 0 0 86%

10%(600mAh 10%) 60mAh 60mAh 60mAh

0 0 51.6 mAh

483.6mAh 516.6mAh 516mAh

80.6% 86.1% 86%

( [6] )

(VCO)(PLL) LDO DSP

PowerManagement

System

Baseband(DSP,ARM,Memory)

RFUp & Down

PLL&

VCO

TCXO

W-LEDBacklightLEDs

VibratorMotor

ColorLCD

DSC ImageSensor(CCD)

DSC Motor

AudioSpeaker

MC

2.5V

5V

3.3V

15V

-7.5V

5V~3.3V

1.5~1.1V

2.5V~3.3V

2.8V

2.8V

2.8V

ConstantCurrent

2.8V

4.2~2.5V

RA

LNA

Texas Instrument TP65010, TPS5100, TPS61130 MAXIM MAX1586A/B, MAX8621

IC DC DC IC

[1] www.maxim-ic.com/an669 [2] www.maxim-ic.com/an737 [3] www.maxim-ic.com/an1051 [4] Ned Mohan, Tore M. Undeland, and William P. Robbins, Power

electronics :converters, applications, and design, Wiley, New York, 667pp, 1989. [5] Pressman, Abraham I., Switching power supply design, McGraw-Hill, New

York, 926pp, 1991 [6] Jeff Falin, Texas Instrument,

2004 6 [7] Landa Pham, Texas Instrument,

2004 6 [8] IC 2001 [9]

1994