TOREX XC9515 User Manual
XC9515 Series
ETR0706-012b
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
●Blue-ray Disk
●LCD TVs, LCD modules
●Multifunctional printers
●Photo printers
●Set top boxes
■TYPICAL APPLICATION CIRCUIT
VIN
NC
PVSS
1
NC
PVSS
2
NC
1
PVDD
PVDD2NC
NC
CIN1 CL1
CIN2
L1
LX1
EN1
EN2
VOUT
1
MR
AVSS
Cd
VOUT
LX2
2
NC
VDOUT
L2
RUP
VOUT1
EN1
EN2
MR
Cd
CL2
VDOUT
VOUT2
■FEATURES
DC/DC Block
Input Voltage Range : 2.5V～5.5V
Output Voltage
: V
=1.2V～4.0V
OUT1
V
=1.2V～4.0V
OUT2
(Accuracy ±2%)
Oscillation Frequency : 1MHz (Accuracy ±15%)
High Efficiency : 95% (VIN=5V, V
OUT
=3.3V)
Output Current : 800mA
Control : PWM control
Protection Circuits : Thermal Shutdown
: Integral Latch (Over Current Limit)
: Short Protection Circuit
Ceramic Capacitor Compatible
Voltage Detector (VD) Block
Detect Voltage Range : 2.0～5.5V（Accuracy ±2%）
Delay Time : 173 ms
(When Cd=0.1μF is connected)
Output Configuration : N-channel open drain
Operating Ambient Temperature :
-40℃ ～ +85℃
Package : QFN-20
Environmentally Friendly : EU RoHS Compliant, Pb Free
■ TYPICAL PERFORMANCE
CHARACTERISTICS
● Efficiency vs. Output Current
VIN=5V, f
100
90
80
70
60
50
40
Efficiency[%]
30
20
10
VOUT=3.3V
VOUT=1.8V
0
1 10 100 1000
=1MHz, L=4.7μH (CDRH4D28C)
OSC
L=4.7uH(CDRH4D28C),CIN=10uF(ceramic),CL=10uF(ceramic)
CIN=10μF (ceramic), CL=10μF (ceramic)
Output Current : IOUT [mA]
VIN=5V,FOSC=1MHz
VOUT=1.5V
1/21
XC9515 Series
■PIN CONFIGURATION
VDD1
NC
LX1
EN1
EN2
17
16
15
V
out1
MR
14
A
13
VSS
CD
12
V
11
out2
※1
QFN-20
(BOTTOM VIEW)
9
10
NC
DOUT
V
P
20
19
18
NC
1
P
2
VSS1
NC
3
P
4
VSS2
NC
5
6
7
8
NC
LX2
VDD2
P
■ PIN ASSIGNMENT
QFN-20
PIN
NUMBER
1 NC No Connection 11 V
2 P_V
PIN NAME FUNCTION
Power Ground 1 12 Cd Delay Capacitor Connection
SS1
PIN
NUMBER
PIN NAME FUNCTION
Output Voltage Sense 2
OUT2
3 NC No Connection 13 A_VSS Analog Ground
4 P_V
5 NC No Connection 15 V
6 P_V
Power Ground 2 14 MR Manual Reset
SS2
Output Voltage Sense1
OUT1
Power Supply 2 16 EN2 CH2 ON/OFF Control
DD2
7 NC No Connection 17 EN1 CH1 ON/OFF Control
8 LX2 Switching Output 2 18 LX1 Switching Output 1
9 NC No Connection 19 NC No Connection
10 V
*1 Back metal pad voltage ：VSS level
（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.）
Voltage Detector output 20 P_V
DOUT
Power Supply 1
DD1
2/21
■FUNCTION CHART
●EN1, EN2 and MR pins are internally pulled up. *2)
PIN LEVEL OPERATIONAL STATUS
EN1
EN2
MR
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. *
PIN LEVEL OPERATIONAL STATUS
EN1
EN2
MR
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)
XC9515①②③④⑤⑥-⑦
High , Open DC/DC_CH1 Operation
Low DC/DC_CH1 Stop
High , Open DC/DC_CH2 Operation
Low DC/DC_CH2 Stop
High , Open VD_OUT Detect RESET Signal Output
Low VD_OUT Force RESET Signal Output
2)
High DC/DC_CH1 Operation
Low DC/DC_CH1 Stop
High DC/DC_CH2 Operation
Low DC/DC_CH2 Stop
High VD_OUT Detect RESET Signal Output
Low VD_OUT Force RESET Signal Output
(*1)
XC9515
Series
DESIGNATOR ITEM SYMBOL DESCRIPTION
① Input Voltage & UVLO
② EN & MR logic control conditions
③④ Set Voltage Combinations 01～ Based on Torex Standard Product Number
⑤⑥-⑦ Package (Order Unit) ZR-G QFN-20 (1,000/Reel)
(*1)
The “-G” suffix denotes Halogen and Antimony free as well as being fully RoHS compliant.
About ①②③④（Output Voltage, Detect Voltage）
XC9515①②③④ VOUT1 [V] VOUT2 [V] VDF（Detect Voltage） [V]
XC9515AB02 1.2 3.3 3.5
XC9515AB04 1.5 3.3 3.5
XC9515AB05 1.8 3.3 3.5
XC9515BA06 1.2 1.8 3.0
XC9515AA07 1.2 3.3 4.2
XC9515AA08 3.3 1.8 4.5
*This series are semi-custom products. For other combinations, output voltages, detect voltage and etc., please ask Torex sales contacts.
A Input Voltage Range 5V±10%, UVLO Voltage 2.7V (TYP.)
B Input Voltage Range 2.5V～5.5V, UVLO Voltage 1.8V (TYP.)
A EN1, EN2, MR pins are not pulled up internally
B
C
D
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
EN1, EN2 pins have built-in pull-up resistors,
MR pin are not pulled up internally
3/21
XC9515 Series
■BLOCK DIAGRAM
●EN1 Pin, EN2 Pin, MR Pin,
Pull-up Inside ●EN1 Pin, EN2 Pin, MR Pin, internally floating
V
OUT1
PVDD1
EN1
EN2
ON/OF
Control
Soft
Start
F
V
OUT2
Soft
Start
PVDD1
MR
Error Amp
Error Amp
Ramp
Wave
OSCVreｆ
Ramp
Wave
PWM
Comparator
PWM
Comparator
Rdelay
Current
Limit
Current
Feedback
Logic
Thermal
Shutdown
Current
Limit
Current
Feedback
Logic
Buffer
Drive
Buffer
Drive
P
LX1
P
P
LX2
P
VDD1
VSS1
VDD2
VSS2
V
DOUT
A
Vreｆ
VSS
Cd
■ABSOLUTE MAXIMUM RATINGS
P
LX1
P
P
LX2
P
VDD1
VSS1
VDD2
VSS2
V
DOUT
V
OUT1
Error Amp
EN1
EN2
V
OUT2
PVDD1
MR
ON/OF
Control
Soft
Start
F
Soft
Start
Error Amp
A
VSS
Comparator
Ramp
Wave
OSCVreｆ
Ramp
Wave
Comparator
Vreｆ
PWM
PWM
Cd
Rdelay
Current
Limit
Current
Feedback
Logic
Thermal
Shutdown
Current
Limit
Current
Feedback
Logic
Buffer
Drive
Buffer
Drive
Ta=25℃
4/21
PARAMETER SYMBOL RATINGS UNITS
P_V
DD1
V
OUT1・VOUT2
・P_V
Pin Voltage
DD2
Pin Voltage
P_V
V
DD1
OUT1
Cd Pin Voltage VCd
V
Pin Voltage V
DOUT
V
Pin Current I
DOUT
EN1・EN2・MR Pin Voltage
LX1・LX2 Pin Voltage
LX1・LX2 Pin Current
Power Dissipation QFN-20
V
EN1,VEN2,VMR
V
Lx1
I
Lx1
Pd (Free air) 300
Pd (PCB mounted) 1000
Operating Ambient Temperature Topr
Storage Temperature Tstg
* P_V
A_VSS=P_V
DD1・2
SS1
stands for P_V
=P_V
=0V
SS2
DD1
=P_V
DD2
, P_V
DD2
, V
OUT2
DOUT
10 mA
DOUT
, V
Lx2
, I
1500 mA
Lx2
A_V
A_V
A_V
SS
A_V
SS
-0.3～P_V
SS
A_V
SS
A_V
SS
-0.3～P_V
SS
-0.3～6.5
-0.3～6.5
DD1・2
-0.3～6.5
-0.3～6.5
DD1・2
+ 0.3
+0.3
V
V
V
V
V
V
mW
o
-40 ～ +85
-55 ～ +125
C
o
C
y
XC9515
■ELECTRICAL CHARACTERISTICS
XC9515AB04xx
● DC/DC CH1, CH2 (V
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT
Input Voltage VIN 4.5 5.0 5.5 V
Output Voltage 1 VOUT1
Output Voltage 2 VOUT2
Maximum Output Current 1・2
Current Limit 1・2
Oscillation Frequency f
Maximum Duty Cycle D
Minimum Duty Cycle D
Efficiency 1
Efficiency 2
LX1・2 "H" ON Resistance
LX1・2 "L" ON Resistance
Integral Latch Time 1・2
Soft-Start Time 1・2
EN1・2 "H" Level Voltage
EN1・2 "L" Level Voltage
EN1・2 "H" Level Current
EN1・2 "L" Level Current
LX1・2 "H" Leakage Current
LX1・2 "L" Leakage Current
Test Conditions：
* P_V
DD1・2
**Unless otherwise stated, P_V
*** A_VSS=P_V
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
*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 Low level from
current limit pulse generating.
*6：”H” is judged as “H”>VIN-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.
：Lead current which LX1 and LX2 are measured separatel
*9
(*2)
EFFI1
(*2)
EFFI2
stands for P_V
=P_V
SS1
OUT1
=1.5V, V
OUT2
=3.3V, f
OSC
Connected to the external components,
P_V
DD1・2=VEN1=VEN2
Connected to the external components,
P_V
DD1・2=VEN2=VEN1
IOUTMAX1
(*1)
IOUTMAX2
LIM1,
I
I
LIM 2
Connected to the external components, I
OSC
V
MAX
V
MIN
Connected to the external components,
P_V
Connected to the external components,
P_V
LX1H
・RLX2H
R
R
LX1L
・RLX2L
V
OUT1=VOUT2
LX1 and LX2 are pulled down by a resistor of 200Ω
, t
LAT1
t
SS1
LAT2
Time until EN1, EN2 or both pins changes from 0V to
, t
SS2
V
and voltage becomes V
IN
V
V
OUT2
t
VEN1H,
V
EN2H
Voltage which LX1 or LX2 becomes ”H”
VEN1L,
V
EN2L
IEN1H, IEN2H
IEN1L, IEN2L
ILEAK1H,
(*7)
LEAK2H
I
ILEAK1L,
I
LEAK2L
=P_V
DD1
DD2
=5V, V
DD1・2
=0V
SS2
- Lx pin measurement voltage) / 100mA
IN
Voltage which LX1 or LX2 becomes ”L”
P_V
P_V
DD1・2=VLX1=VLX2
P_V
DD1・2
= P_V
EN1=VEN2
=1MHz, EN1・2 Pull-up inside) Ta =25 oC
=0V, I
=0V, I
OUT1=VOUT2
OUT1=VOUT2=VIN
DD1・2=VEN1
=1.5V, I
V
OUT1
DD1・2=VEN2
=3.3V, I
V
OUT2
=0V 100
=5.0V, V
1=200mA
OUT
=5.0V, V
=200mA
OUT2
=0V, ILx1=ILx2=100mA
=Setting Voltage×0.9,
OUT1
= Setting Voltage ×0.9
×0.95, I
OUT1・2
V
OUT1=VOUT2
V
OUT1=VOUT2
P_V
DD1・2=VEN1=VEN2
=5.5V, V
DD1・2
=0V
=0V
EN1=VEN2
=5.5V, V
=5.5V, V
DD1・2
LX1=VLX2=VEN1=VEN2
.
=30mA
OUT1
=30mA
OUT2
=10mA 0.85 1.00 1.15 MHz
OUT
=0V,
EN2
=0V,
EN1
(*3)
(*5)
=10mA
OUT1・2
(*6)
(*6)
=5.5V －
=0V －
=0V － －
EN1=VEN2
=0V
1.470 1.500 1.530 V
3.234 3.300 3.366 V
800
1000
－ －
－ －
－ －
－ －
89
－
94
－
0.35
－
0.35
－
6
－
1.3
－
1.2
AVSS
－
－
-6
(*9)
-3.0
－ － μA ④
0 %
－
－
(*4)
－ Ω ③
(*4)
－ Ω －
－
－
V
V
IN
0.4 V
(*8)
0.1
(*8)
－ μA ④
(*9)
1.0
mA
mA
%
%
%
ms
ms
μA ④
μA ④
Series
－
①
①
①
②
①
②
②
①
①
⑦
①
④
④
5/21
XC9515 Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9515AB04xx
●Voltage Detector (VD) (MR pin Pull-up Inside) Block
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT
Detect Voltage V
Hysteresis Width V
VD Output Current I
Delay Resistance R
MR "H" Level Voltage V
MR "L" Level Voltage V
MR "H" Level Current I
MR "L" Level Current I
Test Conditions：
* P_V
**Unless otherwise stated, P_V
*** A_VSS=P_V
NOTE :
：V
*1
：V
*2
*3
：”H” is judged as “H”>V
stands for P_V
DD1・2
=P_V
SS1
=Detect Voltage
DF(E)
=Release Voltage
DR(E)
(*1)
DF(E)
V
HYS
DOUT
DLY
V
MRH
V
MRL
MRH
MRL
=P_V
DD1
DD2
=5V, V
DD1・2
=0V
SS2
-0.1V, ”L” is judged as “L”<0.1V
IN
P_V
EN1=VEN2
=(V
HYS
DR(E)
DD1・2=VDF
DOUT
DOUT
P_V
P_V
= P_V
(*3)
- V
) / V
DF(E)
-0.01V, Apply 0.5V to V
=”H” Level Voltage
=”L” Level Voltage
DD1・2=VMR
DD1・2
DD1・2
=5.5V － －
=5.5V, VMR=0V －
×100
DF(E)
DOUT
(*3)
1.2 － VIN V
(*3)
AVSS
V
DF(T)
DF(T)
×0.98
V
－
5.0 6.6 8.0 mA
－
-6.0
5.0
2.5
－
V
DF(T)
(*2)
×1.02
－
－ MΩ －
0.4 V
0.1
－ μA ④
XC9515AB04xx
●Whole Circuit (V
OUT1
=1.5V, V
OUT2
=3.3V, f
=1MHz, EN1・2 Pull-up Inside)
OSC
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT
Supply Current 1 IDD1 V
Supply Current 2 IDD2
V
OUT1=VOUT2
OUT1=VOUT2
=Setting Voltage x 1.1 （Oscillation stops） －
Stand-by Current ISTB V
UVLO Detect Voltage VUVLOF VIN voltage which V
UVLO Release Voltage VUVLOR VIN voltage which V
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis Width
Test Conditions：
* P_V
**Unless otherwise stated, P_V
*** A_VSS=P_V
NOTE :
*1：”H” is judged “H”>V
stands for P_V
DD1・2
SS1
=P_V
TSD
T
HYS
T
=P_V
DD1
=0V
SS2
-0.1V, ”L” is judged “L”<0.1V
IN
DD1・2
DD2
=5V, V
EN1=VEN2
= P_V
=Setting Voltage x 0.9
EN1=VEN2
OUT1
OUT1
DD1・2
=0V
=0V and LX pin becomes ”L”
=0V and LX pin becomes ”H”
950 1500
－
75 145
18 33
－
(*1)
2.4 2.7 3.0 V
(*1)
－ －
150
－
20
－
3.5 V
－
－
Ta =2 5oC
V
%
μA ④
⑤
－
④
④
④
Ta =2 5oC
μA ⑥
μA ⑥
μA ⑥
②
②
o
C
o
C
－
－
6/21
■ELECTRICAL CHARACTERISTICS (Continued)
XC9515BA06xx
●DC/DC CH1, CH2 (V
=1.5V, V
OUT1
OUT2
=3.3V, f
=1MHz, EN1 and EN2 pins are internally floating)
OSC
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT
Input Voltage VIN 2.5
5.5 V
－
Connected to the external components,
Output Voltage1 VOUT1
P_V
DD1・2=VEN1
=30mA
I
OUT1
, V
EN2
=0V
1.470 1.500 1.530 V
Connected to the external components,
Output Voltage2 VOUT2
IOUTMAX1
Maximum Output Current 1・2
Current Limit 1・2
Oscillation Frequency f
Maximum Duty Cycle D
Minimum Duty Cycle D
Efficiency 1
Efficiency 2
LX1・2 "H" ON Resistance
LX1・2 "L" ON Resistance
Integral Latch Time 1・2
Soft-Start Time 1・2
EN1・2 "H" Voltage
EN1・2 "L" Voltage
EN1・2 "H" Current
EN1・2 "L" Current
LX1・2 "H" Leak Current
LX1・2 "L" Leak Current
Test Conditions：
* P_V
**Unless otherwise stated, P_V
*** A_VSS=P_V
NOTE :
*1
：When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
*2：EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100
*3
：On resistance (Ω)= (V
*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 Low level
*6：”H” is judged as “H”>VIN-0.1V, ”L” is judged as ”L”<0.1V.
：When temperature is high, a current of approximately 20μA (maximum) may leak.
*7
*8
：Current which EN1 and EN2 are measured separately.
*9
：Lead current which LX1 and LX2 are measured separately.
stands for P_V
DD1・2
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
from current limit pulse generating.
(*1)
IOUTMAX2
LIM1, ILIM 2 1000
I
Connected to the external components, I
OSC
V
MAX
V
MIN
(*2)
EFFI1
(*2)
EFFI2
RLX1H, RLX2H V
RLX1L, RLX2L
LAT1, tLAT 2
t
SS1, tSS2
t
EN１H, VEN2H
V
EN1L, VEN2L
V
, I
, I
, I
, I
DD1・2
EN2H
EN2L
leak2H
leak2L
DD2
=5V, V
SS1
=P_V
I
EN1H
I
EN1L
(*7)
I
leak1H
I
leak1L
=P_V
DD1
=0V
SS2
- Lx pin measurement voltage) / 100mA
IN
LX1 and LX2 are pulled down by a resistor of 200Ω
V
= Setting Voltage×0.9, V
OUT1
Time until EN1, EN2 or both pins changes from 0V to V
and voltage becomes V
Voltage which LX1 or LX2 becomes ”H”
Voltage which LX1 or LX2 becomes ”L”
EN1=VEN2
P_V
DD1・2=VEN2
OUT1=VOUT2
OUT1=VOUT2=VIN
Connected to the external components,
P_V
DD1・2=VEN1
=1.5V, I
V
OUT1
Connected to the external components,
P_V
DD1・2=VEN2
=3.3V, I
V
OUT2
OUT1=VOUT2
V
OUT1=VOUT2
V
OUT1=VOUT2
P_V
DD1・2=VEN1=VEN2
P_V
DD1・2
P_V
DD1・2=VLX1=VLX2
P_V
DD1・2
= P_V
=5.5V, V
DD1・2
, V
EN1
=30mA
I
OUT2
=0V 100
=5.0V, V
=200mA
OUT1
=5.0V, V
=200mA
OUT2
=0V, I
=100mA
Lx1=ILx2
= Setting Voltage×0.9
OUT2
×0.95, I
OUT1・2
=0V
=0V
=5.5V － －
=5.5V, V
EN1=VEN2
=5.5V, V
LX1=VLX2=VEN1=VEN2
=0V
=10mA 0.85 1.00 1.15 MHz
OUT
=0V
EN2
=0V
EN1
(*3)
=10mA
OUT1・2
(*6)
(*6)
=0V
=0V － －
EN1=VEN2
=0V
3.234 3.300 3.366 V
800
－ －
－ －
－ －
－ －
89
－
94
－
0.35
－
0.35
－
－
(*5)
IN
AVSS
-0.1
-3.0
6
－
1.3
－
1.2
－
(*8)
－ － μA ④
(*9)
－ － μA ④
0 %
－
－
(*4)
－ Ω ③
(*4)
－ Ω
－
－
V
V
IN
0.4 V
(*8)
0.1
(*9)
1.0
mA
mA
%
%
%
ms
ms
μA ④
μA ④
XC9515
Series
Ta =2 5 oC
①
①
①
②
①
②
②
①
①
-
⑦
①
④
④
7/21
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