XCM517
Series
600mA Synchronous Dual Output Step-Down DC/DC Converters
ETR2425-007
■GENERAL
DESCRIPTION
The XCM517 series is a multi combination module IC which comprises of two 600mA driver transistor built-in synchronous
step–down DC/DC converter. The XCM517 series is available in an ultra small package USP-12B01 suited for space
conscious applications.
The XCM517 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42ΩP-channel driver
transistor and 0.52ΩN-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs enable a high
efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected
externally. Operating voltage range is from 2.7V to 6.0V. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected
for suiting to your particular application. As for operation mode, the XCM517xA / XCM517xB series are PWM control, the
XCM517xC / XCM517xD series are automatic PWM/PFM switching control, allowing fast response, low ripple and high
efficiency over the full range of loads (from light load to heavy load).
The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce
current consumption to as low as 1.0μA or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal
P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower.
■APPLICATIONS
●Mobile
phones, Smart phones
●Bluetooth
equipment
●Personal
Device Assistances
●Portable
games
●Digital
still cameras, camcorders
■FEATURES
P-ch Driver Transistor Built-In
N-ch Driver Transistor Built-In
Input Voltage Range
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Soft-Start Circuit Built-In
Current Limiter Circuit Built-In
Ceramic Capacitor Compatible
Control Methods
: ON resistance 0.42Ω
: ON resistance 0.52Ω
: 2.7V ~ 6.0V
: 92% (TYP.)
: 600mA
: 1.2MHz, 3.0MHz (+15%)
: 100%
(Constant Current & Latching)
■TYPICAL
APPLICATION CIRCUIT
: PWM (XCM517xA / XCM517xB)
PWM/PFM Auto (XCM517xC / XCM517xD)
*Performance depends on external components and wiring on the PCB.
Combination of voltage
1 ch
2ch
XCM517xx01D
1.2V
1.8V
XCM517xx02D
1.2V
3.3V
XCM517xx03D
1.8V
3.3V
XCM517xx06D
1.5V
1.8V
XCM517xx07D
1.5V
3.3V
*The other combination of voltage is semi-custom.
* The dotted lines in the circuit indicates the connection using through-holes at the
backside of the PC board
VOUT1
AGND1
EN1
VIN2
PGND2
Lx2
1
VOUT
AGND
Lx
12
Lx1
PGND1
VIN1
EN2
AGND2
VOUT2
XC9235/XC9236
2
PGND
11
3
CE
VIN
10
4
VIN
CE
9
XC9235/XC9236
5
8
6
Lx
VOUT
7
(TOP VIEW)
1/28
XCM517
Series
■PIN
CONFIGURATIOIN
LX112
PGND1 11
VIN1 10
EN2 9
AGND2 8
VOUT2 7
*2
*1
1 VOUT1
2 AGND1
3 EN1
4 VIN2
5 PGND2
6 Lx2
USP-12B01
(BOTTOM VIEW)
■PIN
ASSIGNMENT
PIN NUMBER
USP-12B01
1
2
3
4
5
6
7
8
9
10
11
12
XCM517
V
OUT1
AGND1
EN1
V
IN2
PGND2
Lx2
V
OUT2
AGND2
EN2
V
IN1
PGND1
Lx1
PIN NAME
XC9235/XC9236
V
OUT
AGND
CE
―
―
―
―
―
―
V
IN
PGND
Lx
XC9235/XC9236
―
―
―
V
IN
PGND
Lx
V
OUT
AGND
CE
―
―
―
FUNCTIONS
DC/DC-1 Channel Block:
Output Voltage sense
DC/DC-1 Channel Block:
Analog Ground
DC/DC-1 Channel Block:
ON/OFF Control
DC/DC-2 Channel Block:
Power Input
DC/DC-2 Channel Block :
Power Ground
DC/DC-2 Channel Block :
Switching
DC/DC-2 Channel Block :
Output Voltage sense
DC/DC-2 Channel Block :
Analog Ground
DC/DC-2 Channel Block :
ON/OFF Control
DC/DC-1 Channel Block :
Power Input
DC/DC-1 Channel Block :
Power Ground
DC/DC-1 Channel Block :
Switching
NOTE:
* A dissipation pad on the reverse side of the package should be electrically isolated.
*1: Electrical potential of the DC/DC 1 channels’ dissipation pad should be V
SS
level.
*2: Electrical potential of the DC/DC 2 channels’ dissipation pad should be V
SS
level.
Care must be taken for an electrical potential of each dissipation pad so as to enhance mounting strength and heat release when the pad
needs to be connected to the circuit.
2/28
XCM517
Series
■PRODUCT
CLASSIFICATION
●Ordering
Information
XCM517①②③④⑤⑥
DESIGNATOR
①②
③④
⑤
⑥
DESCRIPTION
Control, Oscillation
Frequency and Options
Output Voltage
Package
Device Orientation
SYMBOL
-
-
D
R
: See the chart below
: Internally set sequential number relating to output voltage
(See the chart below)
: USP-12B01
: Embossed tape, standard feed
DESCRIPTION
DESIGNATOR
①②
①②
AA
AB
AC
AD
BA
BB
BC
BD
CONTROL
PWM Control
PWM Control
PWM/PFM Auto
PWM/PFM Auto
PWM Control
PWM Control
PWM/PFM Auto
PWM/PFM Auto
OCSILLATION
FREQUENCY
1.2M
3.0M
1.2M
3.0M
1.2M
3.0M
1.2M
3.0M
CL DISCHARGE
Not Available
Not Available
Not Available
Not Available
Available
Available
Available
Available
HIGH SPEED
SOFT-START
Not Available
Not Available
Not Available
Not Available
Available
Available
Available
Available
EN INPUT LOGIC
High Active
High Active
High Active
High Active
High Active
High Active
High Active
High Active
DESIGNATOR
③④
③④
01
02
03
06
07
V
OUT1
1.2
1.2
1.8
1.5
1.5
Output Voltage
V
OUT2
1.8
3.3
3.3
1.8
3.3
*This series are semi-custom products.
For other combinations, output voltages and etc., please ask Torex sales contacts.
3/28
XCM517
Series
■BLOCK
DIAGRAMS
XC9235A / XC9236A Series
XC9235A/XC9236A
XC9235B / XC9236B Series
XC9235B/XC9236B
Available with CL Discharge, High Speed Soft-Start
(CL放電機½有、 高速½フトスタート）
Phase
Compensation
V
OUT
R2
Error Amp.
PWM
Comparator
Current Feedback
Current Limit
Phase
Compensation
V
OUT
R2
Error Amp.
PWM
Comparator
Current Feedback
Current Limit
Logic
R1
Synch
Buffer
Drive
Lx
V
IN
Logic
R1
VSHORT
Synch
Buffer
Drive
Lx
V
IN
Vref with
Soft Start,
CE
VSHORT
PWM/PFM
Selector
Vref with
Soft Start,
CE
PWM/PFM
Selector
CE/
Ramp Wave
Generator
OSC
UVLO Cmp
UVLO
Ramp Wave
Generator
OSC
UVLO Cmp
UVLO
V
SS
R3
V
SS
CE/MODE
Control
Logic
R3
R4
CE
R4
CE/MODE
Control
Logic
CE
NOTE: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside,
and XC9235 series chooses only PWM control.
The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside,
and XC9236 series chooses only PWM/PFM automatic switching control.
Diodes inside the circuit are ESD protection diodes and parasitic diodes.
*Diodes inside the circuit are an ESD protection diode and a parasitic diode.
■MAXIMUM
ABSOLUTE RATINGS
PARAMETER
V
IN1
/ V
IN2
Voltage
L
x1
/ L
x2
Voltage
V
OUT1
/ V
OUT2
Voltage
EN1 / EN2 Voltage
L
x1
/ L
x2
Current
Power Dissipation (Ta=25℃)
USP-12B01
Junction Temperature
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
IN1
/ V
IN2
VL
x1
/ VL
x2
V
OUT1
/ V
OUT2
V
EN1
/ V
EN2
ILx
1
/ ILx
2
Pd
Tj
Topr
Tstg
RATINGS
- 0.3
∼
6.5
- 0.3
∼
V
IN1
+ 0.3 or 6.5
- 0.3
∼
6.5
- 0.3
∼
6.5
±1500
150
125
- 40
∼
+ 85
- 55
∼
+ 125
UNITS
V
V
V
V
mA
mW
℃
℃
℃
4/28
XCM517
Series
■ELECTRICAL
CHARACTERISTICS
●XCM517Ax,
1ch Block /2ch Block
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current
Stand-by Current
Oscillation Frequency
PFM Switching Current
Maximum I
PFM
Limit
Maximum Duty Ratio
Minimum Duty Ratio
Efficiency
(*2)
V
OUT
=1.8V, f
OSC
=1.2MHz, Ta=25℃
CONDITIONS
When connected to external components,
V
IN
=V
EN
=5.0V, I
OUT1
=30mA
When connected to external components,
(*8)
V
IN
=V
OUT(E)
+2.0V, V
EN
=1.0V
V
EN
=V
IN
,V
OUT
=0V,
(*1, *10)
Voltage which Lx pin holding “L” level
V
IN
=V
EN
=5.0V, V
OUT
=V
OUT(E)
×1.1V
V
IN
=5.0V, V
EN
=0V, V
OUT
=V
OUT(E)
×1.1V
When connected to external components,
V
IN
=V
OUT(E)
+2.0V,V
EN
=1.0V, I
OUT
=100mA
When connected to external components,
(*11)
V
IN
=V
OUT(E)
+2.0V, V
EN
=V
IN
, I
OUT
=1mA
V
EN
=V
IN
=(C-1) I
OUT
=1mA
(*11)
SYMBOL
V
OUT
V
IN
I
OUTMAX
V
UVLO
I
DD
I
STB
f
OSC
I
PFM
MAX I
PFM
MAXDTY
MINDTY
EFFI
MIN.
1.764
2.7
600
1.00
-
-
-
1020
120
TYP.
1.800
-
-
1.40
22
15
0
1200
160
200
MAX.
1.836
6.0
-
1.78
50
33
1.0
1380
200
UNITS CIRCUIT
V
V
mA
V
μA
μA
kHz
mA
%
①
①
①
③
②
②
①
①
①
②
②
①
④
④
-
-
⑤
⑤
⑥
①
③
③
⑤
(XCM517AA)
(XCM517AC)
V
IN
=V
EN
5.0V, V
OUT
=V
OUT (E)
×0.9V
V
IN
=V
EN
5.0V, V
OUT
=V
OUT (E)
×1.1V
When connected to external components,
(*7)
V
EN
=V
IN
＝V
OUT (E)
+1.2V , I
OUT
=100mA
(*3)
V
IN
=V
EN
=5.0V, V
OUT
=0V,IL
X
=100mA
(*3)
V
IN
=V
EN
=3.6V, V
OUT
=0V,IL
X
=100mA
(*4)
V
IN
=V
EN
=5.0V
(*4)
V
IN
=V
EN
=3.6V,
V
IN
=V
OUT
=5.0V, V
EN
=0V, L
X
=0V
V
IN
=V
OUT
=5.0V, V
EN
=0V, L
X
=5.0V
(*7)
V
IN
=V
EN
=5.0V, V
OUT
=V
OUT (E)
×0.9V
I
OUT
=30mA
-40℃≦Topr≦85℃
V
OUT
=0V, Applied voltage to V
EN,
(*10)
Voltage changes Lx to “H” level
V
OUT
=0V, Applied voltage to V
EN,
(*10)
Voltage changes Lx to “L” level
V
IN
=V
EN
=5.0V, V
OUT
=0V
100
-
-
-
-
-
-
-
-
900
-
0.65
V
SS
- 0.1
-
-
92
0.35
0.42
0.45
0.52
0.01
0.01
1050
±100
-
-
-
0
-
0.55
0.67
0.66
0.77
1.0
1.0
1350
-
6.0
0.25
0.
%
%
%
Ω
Ω
Ω
Ω
μA
μA
mA
ppm/
℃
V
V
μA
Lx SW "H" ON Resistance 1
R
L
½
H
Lx SW "H" ON Resistance 2
R
L
½
H
Lx SW "L" ON Resistance 1
R
L
½
L
Lx SW "L" ON Resistance 2
R
L
½
L
(*5)
Lx SW "H" Leak Current
ILeakH
(*5)
Lx SW "L" Leak Current
ILeakL
(*9)
Current Limit
ILIM
Output Voltage
△V
OUT
Temperature
V
OUT
・△topr
Characteristics
EN "H" Level Voltage
EN "L" Level Voltage
EN "H" Current
EN "L" Current
V
ENH
V
ENL
I
ENH
I
ENL
V
IN
=5.0V, V
EN
=0V, V
OUT
=0V
- 0.1
-
0.1
μA
⑤
When connected to external components,
0.5
1.0
2.5
ms
①
Soft Start Time
t
SS
V
EN
=0V
→
V
IN
, I
OUT
=1mA
V
IN
= V
EN
=5.0V, V
OUT
=0.8× V
OUT(E)
,
Latch Time
t
LAT
1.0
-
20.0
ms
⑦
(*6)
Short Lx at 1Ω resistance
Sweeping V
OUT
, V
IN
=V
EN
= 5.0V, Short Lx at
Short Protection
V
SHORT
1Ω resistance, V
OUT
voltage which Lx becomes “L”
0.675
0.900
1.125
V
⑦
Threshold Voltage
level within 1ms
Test conditions: Unless otherwise stated, V
IN
= 5.0V, V
OUT (E)
= Setting voltage
NOTE:
*1: Including hysteresis width of operating voltage.
*2: EFFI = { ( output voltage×output current )
/
( input voltage×input current) }×100
*3: ON resistance (Ω)= (V
IN
- Lx pin measurement voltage)
/
100mA
*4: Design value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: Time until it short-circuits DC
OUT
with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse
generating.
*7: When V
OUT(E)
+1.2V<2.7V, V
IN
=2.7V
*8: 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.
*9: Current limit denotes the level of detection at peak of coil current.
*10: "H"＝V
IN
∼V
IN
- 1.2V, "L"＝+ 0.1V
∼
- 0.1V
*11: XCM517xA / XCM517xB series exclude I
PFM
and MAXI
PFM
because those are only for the PFM control’s functions.
*12: The electrical characteristics shows 1 channel values when the other channel is stopped.
5/28
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