XC9515AB01ZL_技术文档

XC9515Series

ETR0706-008

2 channel Synchronous Step-Down DC/DC Converter with Manual Reset

■GENERAL DESCRIPTION

The XC9515 series consists of 2 channel synchronous step-down DC/DC converters and a voltage detector with delay circuit

built-in. The DC/DC converter block incorporates a P-channel 0.35Ω (TYP.) driver transistor and a synchronous N-channel

0.35Ω (TYP.) switching transistor. By minimizing ON resistance of the built-in transistors, the XC9515 series can deliver

highly efficient and a stable output current up to 800mA. With high switching frequencies of 1MHz, a choice of small inductor

is possible. The series has a built-in UVLO (under-voltage lock-out) function, therefore, the internal P-channel driver

transistor is forced OFF when input voltage becomes 1.8V or lower (for XC9515A, 2.7V or lower). The voltage detector block

can be set delay time freely by connecting an external capacitor. With the manual reset function, the series can output a

reset signal at any time.

■APPLICATIONS

●DVDs

■FEATURES

DC/DC Block

Input Voltage Range

Output Voltage

: 2.5V～5.5V

●Blu-ray Disk

: V_OUT1=1.2V～4.0V

V

_OUT2=1.2V～4.0V

●LCD TVs, LCD modules

●Multifunctional printers

●Photo printers

(Accuracy ±2%)

Oscillation Frequency

High Efficiency

Output Current

Control

: 1MHz (Accuracy ±15%)

: 95% (V_IN=5V, V_OUT=3.3V)

: 800mA

●Set top boxes

: PWM control

Protection Circuits

: Thermal Shutdown

: Integral Latch (Over Current Limit)

: Short Protection Circuit

Ceramic Capacitor Compatible

Voltage Detector (VD) Block

Detect Voltage Range

Delay Time

: 2.0～5.5V（Accuracy ±2%）

: 173 ms

(When Cd=0.1μF is connected)

: N-channel open drain

: QFN-20

Output Configuration

Package

■TYPICAL PERFORMANCE

■TYPICAL APPLICATION CIRCUIT

CHARACTERISTICS

● Efficiency vs. Output Current

L1

VOUT1

VIN=5V,FOSC=1MHz

V_IN=5V, f_OSC=1MHz, L=4.7μH (CDRH4D28C)

L=4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

EN1

VIN

C_IN=10μF (ceramic), C_L=10μF (ceramic)

EN2

100

90

80

70

60

50

40

30

20

10

0

VOUT=3.3V

CIN1

CL1

VOUT

1

NC

MR

PVSS

1

VOUT=1.5V

MR

AVSS

Cd

NC

PVSS

2

VOUT

2

NC

Cd

VOUT=1.8V

RUP

CIN2

CL2

VDOUT

1

10

100

1000

Output Current : IOUT [mA]

L2

VOUT2

1/21

XC9515 Series

■PIN CONFIGURATION

V_out115

1

2

3

4

5

NC

MR 14

A_VSS13

CD 12

P_VSS1

NC

※1

P_VSS2

NC

QFN-20

(BOTTOM VIEW)

V_out211

■PIN ASSIGNMENT

QFN-20

PIN NAME

NUMBER

FUNCTION

PIN NAME

FUNCTION

NUMBER

1

2

NC

P_V_SS1

NC

No Connection

Power Ground 1

No Connection

11

12

13

14

15

16

17

18

19

20

V_OUT2

Cd

Output Voltage Sense 2

Delay Capacitor Connection

Analog Ground

3

A_V_SS

MR

4

P_V_SS2

NC

Power Ground 2

No Connection

Manual Reset

5

V_OUT1

EN2

EN1

LX1

Output Voltage Sense1

CH2 ON/OFF Control

CH1 ON/OFF Control

Switching Output 1

No Connection

6

P_V_DD2

NC

Power Supply 2

No Connection

7

8

LX2

Switching Output 2

No Connection

9

NC

10

V_DOUT

Voltage Detector output

P_V_DD1

Power Supply 1

*1 Back metal pad voltage ：V_SSlevel

（The back metal pad should be soldered to enhance mounting strength and heat release. If the pad needs to be connected to

other circuit, care should be taken for the pad voltage level.）

2/21

XC9515

Series

■FUNCTION CHART

●EN1, EN2 and MR pins are internally pulled up. *²⁾

LEVEL

High , Open

Low

OPERATIONAL STATUS

DC/DC_CH1 Operation

EN1

DC/DC_CH1 Stop

High , Open

Low

DC/DC_CH2 Operation

EN2

MR

DC/DC_CH2 Stop

High , Open

Low

VD_OUT Detect RESET Signal Output

VD_OUT Force RESET Signal Output

EN1, EN2 and MR pins are internally pulled up so that the levels of High and Open are same function.

●EN1, EN2 and MR pins are left open internally. *²⁾

LEVEL

High

Low

OPERATIONAL STATUS

DC/DC_CH1 Operation

EN1

DC/DC_CH1 Stop

High

Low

DC/DC_CH2 Operation

EN2

MR

DC/DC_CH2 Stop

High

Low

VD_OUT Detect RESET Signal Output

VD_OUT Force RESET Signal Output

EN1, EN2 and MR pins are floated inside so that these pins shall not be left open outside.

²⁾Please refer to the PRODUCTION CLASSIFICATION to see the combination of pull-up status regarding the EN1, EN2, and MR

*

pins.

■PRODUCT CLASSIFICATION

●Ordering Information (Standard products)

XC9515①②③④⑤⑥

DESIGNATOR

DESCRIPTION

SYMBOL

DESCRIPTION

A

B

A

：Input Voltage Range 5V±10%, UVLO Voltage 2.7V (TYP.)

：Input Voltage Range 2.5V～5.5V, UVLO Voltage 1.8V (TYP.)

①

Input Voltage & UVLO

：EN1, EN2, MR pins are not pulled up internally

：EN1, EN2 pins have built-in pull-up resistors,

MR pin has a built-in pull-up resistor

：EN1, EN2 Pins are not pulled up internally,

MR pin has a built-in pull-up resistor

B

C

②

EN & MR logic control conditions

：EN1, EN2 pins have built-in pull-up resistors,

MR pin are not pulled up internally

D

③④

⑤

Set Voltage Combinations

Package

01～

：Based on Torex Standard Product Number

Z

R

L

：QFN-20

：Embossed tape, Standard feed

：Embossed tape, Reverse feed

⑥

Device Orientation

3/21

XC9515 Series

■BLOCK DIAGRAM

P_VDD

V_OUT1

Current

Limit

Current

Limit

ErrorꢀAmp

Current

Feedback

PVDD1

LX1

PWM

Comparator

PWM

Comparator

Buffer

Drive

Buffer

Drive

Logic

Soft

Start

Soft

Start

EN1

EN2

EN1

Ramp

Wave

Ramp

Wave

ON/

OFF

ON/

OFF

Control

P_VSS1

Control

EN2

Thermal

Shutdown

Vreｆ

OSC

Vreｆ

OSC

P_VDD2

V_OUT2

Current

Limit

Current

Limit

Ramp

Wave

Ramp

Wave

Soft

Start

Soft

Start

Current

Feedback

LX2

ErrorꢀAmp

PWM

Comparator

PWM

Comparator

Buffer

Drive

Buffer

Drive

Logic

PVDD1

P_VSS2

MR

V_DOUT

Rdelay

Vreｆ

A_VSS

Cd

A_VSS

Cd

■ABSOLUTE MAXIMUM RATINGS

Ta=25℃

PARAMETER

SYMBOL

RATINGS

UNITS

P_V_DD1・P_V_DD2Pin Voltage

P_VDD1, P_VDD2

VOUT1, VOUT2

VCd

-0.3～6.5

V

_OUT1・V_OUT2Pin Voltage

Cd Pin Voltage

-0.3～P_V_{DD1 2}+ 0.3

V

・

V_DOUTPin Voltage

V_DOUTPin Current

V_DOUT

-0.3～6.5

10

V

IDOUT

mA

V

EN1・EN2・MR Pin Voltage

LX1・LX2 Pin Voltage

LX1・LX2 Pin Current

VEN1, VEN2, VMR

VLx1, VLx2

ILx1, ILx2

-0.3～6.5

-0.3～P_V_{DD1 2}+0.3

V

・

1500

300

mA

Pd (Free air)

Pd (Wiring on PCB)

Topr

Power Dissipation

QFN-20

mW

1000

Operating Temperature Range

Storage Temperature Range

-40 ～ +85

-55 ～ +125

^oC

Tstg

* P_V_DD1

stands for P_V_DD1=P_V_DD2

2

・

A_V_SS=P_V_SS1=P_V_SS2=0V

4/21

XC9515

Series

■ELECTRICAL CHARACTERISTICS

XC9515AB04xx

● DC/DC CH1, CH2 (V_OUT1=1.5V, V_OUT2=3.3V, f_OSC=1MHz, EN1・2 Pull-up inside)

Ta =25 ^oC

PARAMETER

Input Voltage

SYMBOL

VIN

CONDITIONS

MIN. TYP. MAX. UNITS CIRCUIT

4.5

5.0

5.5

V

－

Connected to the external components,

Output Voltage 1

Output Voltage 2

VOUT1

VOUT2

1.470 1.500 1.530

3.234 3.300 3.366

①

P_V_{DD1 2}=V_EN1=V_EN2=0V, I_OUT1=30mA

・

Connected to the external components,

V

①

②

P_V_{DD1 2}=V_EN2=V_EN1=0V, I_OUT2=30mA

・

IOUTMAX1

IOUTMAX2

I LIM1 ・

I LIM 2

Maximum Output Current 1

・

2 ^(*1)

800

－

mA

Current Limit 1・2

1000

Oscillation Frequency

Maximum Duty Cycle

Minimum Duty Cycle

f_OSC

Connected to the external components, I_OUT=10mA

0.85 1.00

1.15 MHz

①

②

MAXDTY V_OUT1=V_OUT2=0V

MINDTY V_OUT1=V_OUT2=V_IN

100

－

%

－

0

Connected to the external components,

Efficiency 1 ^(*2)

Efficiency 2 ^(*2)

EFFI1

EFFI2

P_V_{DD1 2}=V_EN1=5.0V, V_EN2=0V,

－

89

94

－

%

①

・

V_OUT1=1.5V, I_OUT1=200mA

Connected to the external components,

P_V_{DD1 2}=V_EN2=5.0V, V_EN1=0V,

・

V_OUT2=3.3V, I_OUT2=200mA

LX1

・

2 "H" ON Resistance

2 "L" ON Resistance

R

LX1H

・

R

LX2H V_OUT1=V_OUT2=0V, ILx1=ILx2=100mA ^(*3)

－

0.35^(*4)

－

Ω

③

－

LX1

・

R

LX1L

・

LX2L

LX1 and LX2 are pulled down by a resistor of 200Ω

Integral Latch Time 1・2

Soft-Start Time 1・2

t

_LAT1・ t_LAT2V_OUT1=Setting Voltage×0.9,

_OUT2= Setting Voltage ×0.9^(*5)

Time until EN1, EN2 or both pins changes from 0V to

－

6

－

ms

⑦

V

t

_SS1・ t_SS2

－

1.2

1.3

－

5

ms

V

①

④

V

_INand voltage becomes V_{OUT1 2}×0.95, I_{OUT1 2}=10mA

・・

VEN1H・

VEN2H

VEN1L・

VEN2L

V

_OUT1=V_OUT2=0V

EN1・2 "H" Level Voltage

Voltage which LX1 or LX2 becomes ”H”^(*6)

_OUT1=V_OUT2=0V

Voltage which LX1 or LX2 becomes ”L”^(*6)

V

EN1

・

2 "L" Level Voltage

AVSS

－

0.4

V

EN1

・

2 "H" Level Current

IEN1H・I^EN2HP_V_{DD1 2}=V_EN1=V_EN2=5.5V

－

0.1^(*8)μA

μA

④

・

EN1

・

2 "L" Level Current

IEN1L・I^EN2LP_V_{DD1 2}=5.5V, V_EN1=V_EN2=0V

-6^(*8)

－

・

ILEAK1H・

LX1

・

2 "H" Leakage Current ^(*7)

P_V_{DD1 2}=V_LX1=V_LX2=5.5V, V_EN1=V_EN2=0V

－

1.0^(*9)μA

④

・

ILEAK2H

ILEAK1L・

ILEAK2L

LX1

・

2 "L" Leakage Current

P_V_{DD1 2}=5.5V, V_LX1=V_LX2=V_EN1=V_EN2=0V

-3.0^(*9)

－

μA

・

Test Conditions：

* P_V_DD1stands for P_V_DD1=P_V_DD2

2

・

**Unless otherwise stated, P_V_{DD1 2}=5V, V_EN1=V_EN2= P_V_DD1

2

・

*** A_V_SS=P_V_SS1=P_V_SS2=0V

NOTE :

*1：When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.

*2：EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100

*3：On resistance (Ω)= (V_IN- Lx pin measurement voltage) / 100mA

*4：Designed value.

*5：Time until it short-circuits LX1 (LX2 in the side of 2CH) with GND via 1Ωof resistor from an operational state and is set to Lx=0V from

current limit pulse generating.

*6：”H” is judged as “H”>V_IN-0.1V, ”L” is judged as ”L”<0.1V.

*7：When temperature is high, a current of approximately 20μA (maximum) may leak.

*8：Current which EN1 and EN2 are measured separately.

*9：Lead current which LX1 and LX2 are measured separately.

5/21

XC9515 Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9515AB04xx

●Voltage Detector (VD) (MR pin Pull-up Inside) Block

Ta=25^oC

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP.

MAX. UNITS CIRCUIT

VDF(T)

×0.98

－

VDF(T)

(*1)

(*2)

Detect Voltage

V_DF(E)

VDF(T)

V

⑤

×1.02

－

Hysteresis Width

VD Output Current

V_HYS

I_DOUT

R_DLY

V_MRH

V_MRL

I_MRH

V_HYS=(V_DR(E)^(*3)- V_DF(E)) / V_DF(E)×100

5.0

6.6

2.5

－

%

mA

MΩ

V

－

④

－

④

P_V_{DD1 2}=V_DF-0.01V, Apply 0.5V to V_DOUT

5.0

－

8.0

－

・

Delay Resistance

MR "H" Level Voltage

MR "L" Level Voltage

MR "H" Level Current

MR "L" Level Current

V_DOUT=”H” Level Voltage ^(*3)

V_DOUT=”L” Level Voltage ^(*3)

1.2

AVSS

－

5.5

0.4

0.1

－

V

P_V_{DD1 2}=V_MR=5.5V

－

μA

・

I_MRL

P_V_{DD1 2}=5.5V, V_MR=0V

－

-6.0

・

Test Conditions：

* P_V_DD1

stands for P_V_DD1=P_V_DD2

2

・

**Unless otherwise stated, P_V_{DD1 2}=5V, V_EN1=V_EN2= P_V_DD1

2

・

*** A_V_SS=P_V_SS1=P_V_SS2=0V

NOTE :

*1：V_DF(E)=Detect Voltage

*2：V_DR(E)=Release Voltage

*3：”H” is judged as “H”>V_IN-0.1V, ”L” is judged as “L”<0.1V

XC9515AB04xx

●Whole Circuit (V_OUT1=1.5V, V_OUT2=3.3V, f_OSC=1MHz, EN1・2 Pull-up Inside)

Ta=25^oC

PARAMETER

SYMBOL

CONDITIONS

MIN. TYP. MAX. UNITS CIRCUIT

Supply Current 1

Supply Current 2

Stand-by Current

UVLO Detect Voltage

UVLO Release Voltage

Thermal Shutdown

Temperature

IDD1

IDD2

V_OUT1=V_OUT2=Setting Voltage x 0.9

－

950 1500 μA

⑥

②

V

_OUT1=V_OUT2=Setting Voltage x 1.1 （Oscillation stops）

75

18

1.8

－

145

33

μA

V

ISTB

V_EN1=V_EN2=0V

－

VUVLOF

VUVLOR

V_INvoltage which V_OUT1=0V and LX pin becomes ”L” ^(*1)

V_INvoltage which V_OUT1=0V and LX pin becomes ”H” ^(*1)

2.4

－

3.0

3.5

V

TTSD

THYS

－

150

20

－

^oC

－

Thermal Shutdown

Hysteresis Width

Test Conditions：

* P_V_{DD1 2}stands for P_V_DD1=P_V_DD2

・

**Unless otherwise stated, P_V_{DD1 2}=5V, V_EN1=V_EN2= P_V_DD1

2

・

*** A_V_SS=P_V_SS1=P_V_SS2=0V

NOTE :

*1：”H” is judged “H”>V_IN-0.1V, ”L” is judged “L”<0.1V

6/21

XC9515

Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9515BA06xx

Ta=25 ^oC

●DC/DC CH1, CH2 (V_OUT1=1.5V, V_OUT2=3.3V, f_OSC=1MHz, EN1 and EN2 pins are internally floating)

PARAMETER

Input Voltage

SYMBOL

VIN

CONDITIONS

MIN. TYP. MAX. UNITS CIRCUIT

2.5

5.5

V

Connected to the external components,

Output Voltage1

Output Voltage2

VOUT1

VOUT2

1.470 1.500 1.530

3.234 3.300 3.366

V

①

P_{VDD1 2}=EN1, EN2=0V

・

I_OUT1=30mA

Connected to the external components,

V

①

P_{VDD1 2}=EN2, EN1=0V

・

I_OUT2=30mA

IOUTMAX1

IOUTMAX2

Maximum Output Current 1

・

2 ^(*1)

800

mA

Current Limit 1・2

ILIM1 ・ILIM 2

1000

②

①

②

Oscillation Frequency

Maximum Duty Cycle

Minimum Duty Cycle

f_OSC

Connected to the external components, I_OUT=10mA

0.85 1.00 1.15 MHz

MAXDTY V_OUT1=V_OUT2=0V

100

%

MINDTY

V_OUT1=V_OUT2=V_IN

0

Connected to the external components,

Efficiency 1 ^(*2)

Efficiency 2 ^(*2)

EFFI1

89

94

%

①

P_{VDD1 2}=EN1=5.0V, EN2=0V

・

V_OUT1=1.5V, I_OUT1=200mA

Connected to the external components,

EFFI2

P_{VDD1 2}=EN2=5.0V, EN1=0V

・

V_OUT2=3.3V, I_OUT2=200mA

RLX1H・RLX2H V_OUT1=V_OUT2=0V, ILx1=ILx2=100mA^(*3)

LX1

・

2 "H" ON Resistance

2 "L" ON Resistance

0.35^(*4)

Ω

③

LX1

・

RLX1L・RLX2L

-

LX1 and LX2 are pulled down by a resistor of 200Ω

V_OUT1= Setting Voltage 0.9, V_OUT2= Setting Voltage

0.9 ^(*5)

Integral Latch Time 1・2

Soft-Start Time 1・2

EN1・2 "H" Voltage

EN1・2 "L" Voltage

tLAT1・tLAT2

tSS1・tSS2

6

ms

V

⑦

①

④

×

Time until EN1, EN2 or both pins changes from 0V to V_IN

1.3

and voltage becomes V_{OUT1 2}×0.95, I_{OUT1 2}=10mA

・

V

_OUT1=V_OUT2=0V

Voltage which LX1 or LX2 becomes ”H” ^(*6)

_OUT1=V_OUT2=0V

Voltage which LX1 or LX2 becomes ”L” ^(*6)

VEN１H・VEN2H

VEN1L・VEN2L

1.2

5

V

AVSS

0.4

V

EN1・2 "H" Current

EN1・2 "L" Current

LX1・2 "H" Leak Current ^(*7)

I

_EN1H・I_EN2HP_{VDD1 2}=EN1=EN2=5.5V

0.1^(*8)μA

μA

1.0^(*9)μA

④

・

I

_EN1L・I_EN2LP_{VDD1 2}=5.5V, EN1=EN2=0V

-0.1^(*8)

-3.0^(*9)

・

I

_leak1H・I_leak2HP_{VDD1 2}=LX1=LX2=5.5V, EN1=EN2=0V

・

LX1・2 "L" Leak Current

I

_leak1L・I_leak2LP_{VDD1 2}=5.5V, LX1=LX2=EN1=EN2=0V

・

μA

Test Conditions：

* P_V_DD1

stands for P_V_DD1=P_V_DD2

2

・

**Unless otherwise stated, P_V_{DD1 2}=5V, V_EN1=V_EN2= P_V_DD1

2

・

*** A_V_SS=P_V_SS1=P_V_SS2=0V

NOTE :

*1：When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.

If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.

*2：EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100

*3：On resistance (Ω)= (V_IN- Lx pin measurement voltage) / 100mA

*4：Designed value.

*5：Time until it short-circuits LX1 (LX2 in the side of 2CH) with GND via 1Ωof resistor from an operational state and is set to Lx=0V

from current limit pulse generating.

*6：”H” is judged as “H”>V_IN-0.1V, ”L” is judged as ”L”<0.1V.

*7：When temperature is high, a current of approximately 20μA (maximum) may leak.

*8：Current which EN1 and EN2 are measured separately.

*9：Lead current which LX1 and LX2 are measured separately.

7/21

XC9515 Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9515BA06xx

Ta=25 ^oC

●VD (MR pin is internally floating)

PARAMETER

SYMBOL

CONDITIONS

MIN. TYP. MAX. UNITS CIRCUIT

(*1)

Detect Voltage

Hysteresis Width

V_DF(E)

2.94 3.00 3.06

5.0

V

%

⑤

-

VHYS

IDOUT

RDLY

VMR

IMR

V_HYS={V_DR(E)^(*2)-V_DF(E)}/ V_DF(E)×100

VD Output Current

Delay Resistance

P_V_{DD1 2}=V_DF-0.01V, Apply 0.5V to V_DOUT

5.0

6.6

2.5

8.0

mA

MΩ

V

④

-

・

MR "H" Level Voltage

MR "L" Level Voltage

MR "H" Level Current

MR "L" Level Current

V_DOUT=”H” Level Voltage ^(*3)

V_DOUT=”L” Level Voltage ^(*3)

1.2

5.5

0.4

0.1

④

AVSS

V

P_{VDD1 2}=MR=5.5V

μA

・

)

IMR

P_{VDD1 2}=5.5V,MR=0V

-0.1^(*^８

・

Test Conditions：

* P_V_DD1

stands for P_V_DD1=P_V_DD2

2

・

**Unless otherwise stated, P_V_{DD1 2}=5V, V_EN1=V_EN2= P_V_DD1

2

・

*** A_V_SS=P_V_SS1=P_V_SS2=0V

NOTE :

*1：V_DF(E)=Detect Voltage

*2：V_DR(E)=Release Voltage

*3：”H” is judged as “H”>V_IN-0.1V, ”L” is judged as “L”<0.1V

XC9515BA01xx

Ta=25 ^oC

●Whole Circuit (V_OUT1=1.5V, V_OUT2=3.3V, f_OSC=1MHz, EN1 and EN2 pins are internally floating)

PARAMETER

SYMBOL

CONDITIONS

MIN. TYP. MAX. UNITS CIRCUIT

Supply Current 1

Supply Current 2

Stand-by Current

UVLO Detect Voltage

UVLO Release Voltage

Thermal Shutdown

Temperature

IDD1

IDD2

V

_OUT1=V_OUT2= Setting Voltage×0.9

950 1500 μA

⑥

②

_OUT1=V_OUT2= Setting Voltage×1.1 (Oscillation stops)

75

5.5

1.8

145

11

μA

V

ISTB

EN1=EN2=0V

VUVLOF

VUVLOR

V_INvoltage which V_OUT1=0V and L_Xpin becomes ”L” ^(*1)

V_INvoltage which V_OUT1=0V and L_Xpin becomes ”H” ^(*1)

1.5

2.1

2.3

V

TTSD

THYS

150

20

^oC

-

Thermal Shutdown

Hysteresis Width

Test Conditions：

* P_V_{DD1 2}stands for P_V_DD1=P_V_DD2

・

**Unless otherwise stated, P_V_{DD1 2}=5V, V_EN1=V_EN2= P_V_DD1

2

・

*** A_V_SS=P_V_SS1=P_V_SS2=0V

NOTE :

*1：”H” is judged “H”>V_IN-0.1V, ”L” is judged “L”<0.1V

8/21

XC9515

Series

■TYPICAL APPRICATION CIRCUIT

L1

VOUT1

EN1

VIN

EN2

CIN1

CL1

VOUT

1

NC

MR

PVSS

1

MR

AVSS

Cd

NC

PVSS

2

VOUT

2

NC

Cd

RUP

CIN2

CL2

VDOUT

L2

VOUT2

＜Example of the External Components＞

L1

L2

：4.7μH（CDRH4D28C, SUMIDA）

C_IN1：10μF（ceramic）

C_IN2：10μF（ceramic）

C_L1：10μF（ceramic）

C_L2：10μF（ceramic）

RUP ：100kΩ

9/21

XC9515 Series

■OPERATIONAL EXPLANATION

XC9515 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase

compensation circuit, output voltage adjustment resistors, P-channel driver transistor, N-channel synchronous switching

transistor, current limit circuit, UVLO circuit and others. The series ICs compare, using the error amplifier, the voltage of the

internal voltage reference source with the feedback voltage from V_OUTpin through split resistors, R_FB1and R_FB2. Phase

compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the

turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error

amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause

the Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The

current feedback circuit monitors the P-channel driver transistor current for each switching operation, and modulates the error

amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop even when a low ESR

capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage.

The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.

The ramp wave circuit determines switching frequency. The frequency is fixed internally at 1MHz. Clock pulses generated

in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits.

The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback

voltage divided by the internal split resistor, R_FB1and R_FB2

. When a voltage lower than the reference is fed back, the output

voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are fixed

internally to deliver an optimized signal to the mixer.

The current limiter circuit of the XC9515 series monitors the current flowing through the P-channel MOS driver transistor

connected to the Lx pin, and features a combination of the current limit mode and the latch mode.

①When the driver current is greater than a specific level (peak value of coil current), the current limit function operates to off

the pulses from the Lx pin at any giving timing.

②When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.

③At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an

over current state.

④When the over current is eliminated, the IC resumes its normal operation.

The IC waits for the over current state to end by repeating the steps ①to ③. If an over current state continues for a few

ms and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the

driver transistor. Both two DC/DC blocks stop operations when either CH1 or CH2 of protection circuit is activated. At

this time, both Lx1 and Lx2 become high impedance. Once the IC is in latch mode, operations can be resumed by either

turning the IC off after letting EN1 and EN2 pins down to low level, or by restoring power. For restoring power, the IC

should be turned off after P_V_DD1and P_V_DD2voltages drop below the low level of EN1 and EN2 pin.）The latch operation

can be released from the current limit detection state because of the circuit’s noise. Also, depending on the state of the

PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the

board should be laid out so that capacitors are placed as close to the chip as possible.

Limit < # ms

10/21

XC9515

Series

■OPERATIONAL EXPLANATION (Continued)

For protecting the IC from heat damage, the thermal shutdown circuit monitors the chip temperature. When the chip

temperature reaches 150℃, the thermal shutdown circuit operates and the driver transistor will be set to OFF. As the chip

temperature drops to 130℃ by stopping current flow, the soft-start function operates to turn the output on.

<Short-Circuit Protection>

The short-circuit protection circuit monitors the FB voltage. If the output is shorted incorrectly with the ground, the

short-circuit protection circuit operates and turns the driver transistor off to latch when the FB voltage becomes less than half

of the setting voltage. Both two DC/DC blocks stop operations when either CH1 or CH2 of protection circuit is activated. At

this time, both Lx1 and Lx2 become high impedance. Once the IC is in latch mode, operations can be resumed by either

turning the IC off after letting both ends of EN1 and EN2 pins down to low level, or by restoring power. (The P_V_DD1and

P_V_DD2voltages should be less than the low level of the EN1 and EN2 pins when restoring power.)

The soft-start circuit protects against inrush current, when the power is switched on, and also to protect against voltage

overshoot. It should be noted, however, that this circuit does not protect the load capacitor (CL) from inrush current. With

the Vref voltage limited and depending upon the input to the error amps, the operation maintains a balance between the two

inputs of the error amps and controls the EXT1 pin's ON time so that it doesn't increase more than is necessary.

When the VIN pin voltage becomes1.8V (TYP.) or lower (for XC9515A, 2.7V or lower), the P-channel output driver transistor is

forced OFF to prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage

becomes 1.9V (TYP.) or higher (for XC9515A, 3.0V or lower), switching operation takes place. By releasing the UVLO

function, the IC performs the soft-start function to initiate output startup operation.

The series' detector function monitors the voltage divided by resistors connected to the P_VDD1 pin, as well as monitoring the

voltage of the internal reference voltage source via the comparator. Because of hysteresis at the detector function, output at

the V_DOUTpin will invert when the sense pin voltage of the detector block (P_VDD1) increases above the release voltage (105%

of the detect voltage). The output configuration of the V_DOUTpin is N-channel open drain, therefore, a pull-up resistor is

required. The voltage detector block has a manual reset (MR) pin. By setting the MR pin at low level, the V_DOUTpin is forced

to be at low level.

By connecting a capacitor (Cd) to the Cd pin, the XC9515 series can set a delay time to VDOUT pin’s output signal when

releasing voltage. The delay time can be calculated from the internal resistance, Rdelay (2.5MΩ fixed TYP.) and the

value of Cd as per the following equation. As selecting the capacitor (Cd), the delay time can be set freely.

t

_DR(Delay time) ＝Cd x Rdelay x 0.69

●Release Delay

Delay Capacity Cd [μF]

Ta=25 ^oC

Release Delay t_DR(TYP.) [ms]

Release Delay t_DR(MIN.～MAX.) [ms]

0.01

0.022

0.047

0.1

0.22

0.47

1

17

38

81

173

380

811

1725

10～24

23～53

49～113

103～242

228～532

487～1135

1035～2415

11/21

XC9515 Series

■NOTES ON USE

1. Please use this IC within the stated maximum ratings. The IC is liable to malfunction should the ratings be exceeded.

2. Please apply the same electrical potential to the P_V_DD1and P_V_DD2pins. Even where either CH1 or CH2 is used, both

P_V_DD1and P_V_DD2pins should have the same electrical potential. Applying the electrical potential to only one side

causes malfunction. Also the same electrical potential should be applied to the P_V_SS1, P_V_SS2and A_V_SSpins.

3. The XC9515 series is designed for use with ceramic output capacitors. If, however, the potential difference between

dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high switching energy and

the output could be unstable. If the input-output potential difference is large, use a larger output capacitor to compensate for

insufficient capacitance.

4. When the peak current, which exceeds limit current flows within the specified time, the built-in driver transistor is turned off

(the integral latch circuit). During the time until it detects limit current and before the built-in transistor can be turned off, the

current for limit current flows; therefore, care must be taken when selecting the rating for the coil.

5. When the input voltage is low, limit current may not be reached because of voltage falls caused by ON resistance or serial

resistance of the coil.

6. Since the potential difference for input voltage has occurred to the both ends of a coil, the time changing rate of the coil

current is large when the P-channel driver transistor is ON. On the other hand, since the V_OUTpin short-circuits to the GND

when the N-channel transistor is ON and there is almost no potential difference of the coil both ends, the time changing rate

of the coil current becomes very small.

This operation is repeated and the delay time of the circuit also influences, therefore, the coil current is converged on the

current value beyond the amount of current which should be restricted essentially.

The short-circuit protection does not operate during the soft-start time. As soon as the soft-start time finishes, the

short-circuit protection starts to operate and the circuit becomes disable.

The delay time of the circuit also influences when step-down ratio is large, as the result, a current more than over current

limit may flow. Please do not exceed the absolute maximum ratings of the coil.

①

②

A current flows to the driver transistor up to the current limit (I_LIM).

For the delay time of the circuit, a current more than the I_LIMflows after the I_LIMdecide until the P channel driver

transistor turns off.

③

Time changing rate of the coil current becomes very small because there is no potential difference between both ends

of the coil.

④

⑤

The Lx pin oscillates a narrow pulse during the soft-start time because of the current limit.

The circuit is latched since the short-circuit protection operates and the P-channel driver transistor is turned off.

# ms

12/21

XC9515

Series

■NOTES ON USE (Continued)

7. Driving current below the minimum operating voltage may lead malfunction to the UVLO circuit because of the noise.

8. Depending on the PC board condition, the latch function may be released from limit current detection state and the latch

time may extend or fail to reach the latch operation. Please locate the input capacitance as close to the IC as possible.

9. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by

external component selection, such as the coil inductance, capacitance values, and board layout of external components.

Once the design has been completed, verification with actual components should be done.

10. With the DC/DC converter block of the IC, the peak current of the coil is controlled by the current limit circuit. Since the

peak current increases when dropout voltage or load current is high, current limit starts operating, and this can lead to

instability. When peak current becomes high, please adjust the coil inductance value and fully check the circuit operation.

In addition, please calculate the peak current according to the following formula:

Peak current: Ipk = (VIN - V_OUT) x OnDuty / (2 x L x fosc) + I_OUT

L: Coil Inductance Value, f_OSC: Oscillation Frequency

11. When the load current is light in PWM control, very narrow pulses will be outputted, and there is the possibility that some

cycles may be skipped completely.

12. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and

there is the possibility that some cycles may be skipped completely.

13. If the power input pin voltage is assumed to decrease rapidly (ex. from 6.0V to 0V) at the release of the operation

although delay capacitance (Cd) pin is connected, please connect an Shottky barrier diode between the power input

(P_V_DD1) pin and the delay capacitance (Cd) pin.

14. Please connect a pull-up resistor with 100 to 200kΩ to the output pin of the voltage detector block (V_DOUT).

15. The delay time of the voltage detector block in heavy load may extend because of the noise of the DC/DC block.

Precipitous and large voltage fluctuation at the power input pin may cause malfunction of the IC.

16. Use of the IC at voltages below the minimum operating voltage may lead the output voltage drop before achieving over

current limit.

17. When P_VDD1 and P_VDD2 power supply pins and EN1 and EN2 enable pins are in undefined states, the latch

protection circuit may not be reset so that the IC operation does not start correctly. Power supply and enable pins

（EN1,EN2） should be grounded before starting the IC operation.

【Undefined state conditions for each pin】

P_V_DD1=P_V_DD2=0.1V ~ 1.2V

V_EN1=V_NE2= 0.4V ~ 1.2V

18. UVLO function works even if when V_INinput voltage falls below the UVLO voltage in very short time period like a few ten

nanoseconds.

●Instruction on Pattern Layout

1. In order to stabilize VIN's voltage level, we recommend that a by-pass capacitor (CIN1 and CIN2) be connected as close

as possible to the P_V_DD1・P_V_DD2pins and P_V_SS1・P_V_SS2pins.

2. Please mount each external component as close to the IC as possible.

3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit

impedance.

4. Make sure that the V_SStraces are as thick as possible, as variations in the VSS potential caused by high VSS currents

at the time of switching may result in instability of the DC/DC converter.

13/21

XC9515 Series

■TEST CIRCUITS

Wave Form Measurement Point

< Test Circuit No.1 >

A

L

LX1

EN1

EN2

PVDD1

CL

CIN

PVSS1

PVSS2

VOUT1

MR

AVSS

CD

VOUT2

VDOUT

CIN

PVDD2

LX2

L

V

A

V

Wave Form Measurement Point

※ꢀExternal Components

L

: 4.7μH(CDRH4D28C : SUMIDA)

CIN : 10μF (ceramic)

CL : 10μF (ceramic)

Wave Form Measurement Point

< Test Circuit No.2 >

A

LX1

PVDD1

EN1

EN2

A

PVSS1

PVSS2

VOUT1

MR

1μF

AVSS

CD

VOUT2

VDOUT

V

PVDD2

LX2

A

V

Wave Form Measurement Point

< Test Circuit No.3 >

100ｍA

A

LX1

EN1

EN2

V

PVDD1

PVSS1

PVSS2

VOUT1

MR

AVSS

CD

VOUT2

VDOUT

1μF

PVDD2

LX2

100ｍA

A

14/21

XC9515

Series

■TEST CIRCUITS (Continued)

Wave Form Measurement Point

15/21

XC9515 Series

■TYPICAL PERFORMANCE CHARACTERISTICS

(1) Efficiency vs. Output Current

VIN=5V,FOSC=1MHz

L=4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

100

90

80

70

60

50

40

30

20

10

0

VOUT=3.3V

VOUT=1.5V

VOUT=1.8V

1

10

100

Output Current: I_OUT(mA)

1000

Output Current : IOUT [mA]

(2) Output Voltage vs. Output Current

VOUT=1.5V

L:4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

VOUT=1.8V

VIN=5. 0V

L:4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

VIN=5.0V

1.60

1.90

1.85

1.80

1.75

1.70

1.55

1.50

1.45

1.40

1

10

100

Output Current: I_OUT(mA)

1000

1

10

100

1000

Output Current : IOUT[mA]

Output Current: I_OUT(mA)

VOUT=3.3V

VIN=5.0V

L:4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

3.40

3.35

3.30

3.25

3.20

1

10

100

Output Current: I_OUT(mA)

1000

Output Current : IOUT[mA]

16/21

XC9515

Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(3) Output Voltage vs. Ambient Temperature

V_OUT=1.2V

V_OUT=1.5V

Vout=1.2V

Vout=1.5V

VIN=2.5V,3.0V,4.0V,5.0V,5.5V

L:4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

1.30

1.25

1.20

1.15

1.10

1.05

1.00

1.60

1.55

1.50

1.45

1.40

1.35

1.30

VIN=2.5V,3.0V,4.0V,5.0V,5.5V

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

℃

]

Ambient Temperature:Ta[

]

Ambient Temperature:Ta[

V_OUT=1.8V

Vout=1.8V

L:4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

V

=3.3V

Vo^Ou^Ut=^T3.3V

L:4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

VIN=2.5V,3.0V,4.0V,5.0V,5.5V

VIN=4.0V,5.0V,5.5V

3.40

3.35

3.30

3.25

3.20

3.15

3.10

1.90

1.85

1.80

1.75

1.70

1.65

1.60

VIN=2.5V,3.0V,4.0V,5.0V,5.5V

VIN=4.0V,5.0V,5.5V

-50

-25

0

25

50

75

100

-50

-25

0

25

50

75

100

Ambient Temperature:Ta[

]

℃

Ambient Temperature:Ta[

]

(4) Oscillation Frequency vs. Ambient Temperature

f_OSC=1MHz

FOSC=1MHz

VIN=2.5V,3.0V,4.0V,5.0V,5.5V

L:4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)

1.2

1.1

1.0

0.9

0.8

0.7

VIN=2.5V,3.0V,4.0V,5.0V,5.5V

-50

-25

0

25

50

75

100

℃

Ambient Temperature:Ta[

]

17/21

XC9515 Series

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

(5) Load Transient Response

V_IN=5V, V_OUT1=1.5V, V_OUT2=3.3V, f_OSC=1MHz

VIN=5V,VOUT1=1.5V,VOUT2=3.3V,FOSC=1MHz,

VOUT1=200mV/div

VOUT2=200mV/div

IOUT1=200mA

IOUT1=1mA

50μs/div

200μs/div

V_IN=5V, V_OUT1=1.5V, V_OUT2=3.3V, f_OSC=1MHz

VIN=5V,VOUT1=1.5V,VOUT2=3.3V,FOSC=1MHz,

VOUT1=200mV/div

VOUT2=200mV/div

IOUT1=800mA

IOUT1=200mA

IOUT1=800mA

IOUT1=200mA

50μs/div

200μs/div

V =5V, V

=1.5V, V

=3.3V, f =1MHz

VIN=5V,VOUT1=1.5V,VOUT2=3.3V,FOSC=1MHz,

IN

OUT1

OUT2 OSC

VOUT1=200mV/div

VOUT2=200mV/div

IOUT2=200mA

IOUT2=1mA

50μs/div

200μs/div

50μs/div

V_IN=5V, V_OUT1=1.5V, V_OUT2=3.3V, f_OSC=1MHz

VIN=5V,VOUT1=1.5V,VOUT2=3.3V,FOSC=1MHz,

VOUT1=200mV/div

VOUT2=200mV/div

IOUT2=800mA

IOUT2=200mA

IOUT2=800mA

IOUT2=200mA

200μs/div

50μs/div

200μs/div

18/21

XC9515

Series

■PACKAGING INFORMATION

●QFN-20

Unit: mm

(0.2)

1 PIN INDENT

+0.03

-0.02

0.02

4.00±0.10

0.75±0.05

0.40±0.05

2.70±0.05

6

7

9

10

8

11

12

13

14

15

5

4

3

2

1

*The solder filet may not be formed because of no plating at side.

20 19

18 17 16

●QFN-20 Reference Pattern Layout

●QFN-20 Reference Metal Mask Design

4.6

3.2

4.5

3.3

0.3

0.5

1.1

0.5

2.7

0.3

Thickness of solder paste：120μm (reference)

19/21

XC9515 Series

■MARKING RULE

●Standard Product

●QFN-20

①②③Represent product series

MARK

PRODUCT SERIES

XC9515******

①

②

③

1pin

5

1

5

①②③④⑤⑥

⑦⑧⑨

④⑤⑥⑦Represents integer number of setting voltage

MARK

PRODUCT SERIES

④

⑤

⑥

⑦

0

1

XC95150001**

QFN-20

⑧⑨Represents production lot number

Order of 01, …09, 10, 11, …99, 0A, …0Z, 1A, …9Z, A0, …Z9, AA, …ZZ.

(G, I, J, O, Q, W excepted)

(TOP VIEW)

*No character inversion used.

20/21

XC9515

Series

1. The products and product specifications contained herein are subject to change without

notice to improve performance characteristics. Consult us, or our representatives

before use, to confirm that the information in this datasheet is up to date.

2. We assume no responsibility for any infringement of patents, patent rights, or other

rights arising from the use of any information and circuitry in this datasheet.

3. Please ensure suitable shipping controls (including fail-safe designs and aging

protection) are in force for equipment employing products listed in this datasheet.

4. The products in this datasheet are not developed, designed, or approved for use with

such equipment whose failure of malfunction can be reasonably expected to directly

endanger the life of, or cause significant injury to, the user.

(e.g. Atomic energy; aerospace; transport; combustion and associated safety

equipment thereof.)

5. Please use the products listed in this datasheet within the specified ranges.

Should you wish to use the products under conditions exceeding the specifications,

please consult us or our representatives.

6. We assume no responsibility for damage or loss due to abnormal use.

prior permission of TOREX SEMICONDUCTOR LTD.

21/21


型号：	XC9515AB01ZL
厂家：	Torex Semiconductor
描述：	2 channel Synchronous Step-Down DC/DC Converter with Manual Reset 2通道同步降压型DC / DC转换器，带有手动复位转换器
文件：	总21页 (文件大小：361K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

XC9515AB01ZL [TOREX]

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