XCM520
Series
■GENERAL
DESCRIPTION
ETR2427-002a
600mA Synchronous Step-Down DC/DC Converter + Dual LDO Regulator
The XCM520 series is a multi chip module which comprises of a 600mA driver transistor built-in synchronous step–down
DC/DC converter and a dual CMOS LDO regulator. The device is housed in small USP-12B01 package which is ideally
suited for space conscious applications.
The XCM520 can replace this dual DC/DC to eliminate one inductor and reduce output noise.
The DC/DC converter with a built-in 0.42ΩP-channel MOS and a 0.52ΩN-channel MOS provides a high efficiency, stable
power supply up to 600mA to using only a coil and two ceramic capacitors connected externally.
The highly accurate, low noise, dual CMOS LDO regulator includes a reference voltage source, error amplifiers, driver
transistors, current limiters and phase compensation circuits internally. The series is also fully compatible with low ESR
ceramic capacitors.
This high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response
performance and high PSRR achieved across a broad range of frequencies. The EN function allows the output of each
regulator to be turned off independently, resulting in greatly reduced power consumption.
■APPLICATIONS
●Mobile
phones, Smart phones
●Bluetooth
headsets
●WLAN
PC cards
●Portable
HDDs, SSDs
●PDAs,
PNDs, UMPCs
●MP3
players, Media players
●Portable
game consoles
●Cordless
phones, Radio communication equipment
■FEATURES
<DC/DC Convertor Block>
Driver Transistor
Switching Transistor
Input Voltage Range
High Efficiency
Output Current
Soft-Start
Control
: 0.42Ω P-channel MOS Built-in
: 0.52Ω N-channel MOS Built-in
: 2.7V
∼
6.0V
: 92% (TYP.) *
: 600mA
: Built-In Soft-Start
: Fixed PWM, Auto PWM/PFM
Output Voltage Range
: 0.8V
∼
4.0V
Oscillation Frequency
: 1.2MHz,3.0MHz (±15%)
Current Limiter Circuit
: Constant Current & Latching
*Performance depends on external components and wiring on PCB wiring.
<Dual LDO Regulator Block>
■TYPICAL
APPLICATION CIRCUIT
V
OUT1
1.8V
C
L2
1μF
C
IN1
1μF
V
IN
3.3V
C
IN2
4.7μF
1
2
3
V
OUT2
EN2
V
OUT1
12
V
SS
11
EN1
10
V
OUT2
1.2V
C
L1
1μF
V
IN1
V
IN2
PGND
L
x
4
EN3
9
AGND
8
V
OUT3
7
5
6
C
L3
10μF
V
OUT3
2.3V
L
1.5μH
* The dashed lines denote the connection using through-holes
at the backside of the PC board.
* The above circuit uses XCM520AA01 series.
* The DC/DC block V
OUT3
is connected to the dual LDO regulator
V
IN1
in this connection.
* Also, it is possible to operate two V
IN
independently.
: 150mA (Limiter 300mA TYP.)
: 100mV @ 100mA
: 1.5V~6.0V
: 0.8V~5.0V (0.05V increments)
: ±2% (V
OUT
>1.5V)
±30mV (V
OUT
≦1.5V)
Low Power Consumption
: 25μA (TYP.)
Stand-by Current
: Less than 0.1μA(TYP.)
High Ripple Rejection
: 70dB @1kHz
Low Output Noise
Operating Temperature Range
: -40℃~+85℃
Low ESR Capacitor
: Ceramic Capacitor Compatible
Package
: USP-12B01
Standard Voltage Combinations
: V
OUT1
V
OUT2
V
OUT3
XCM520xx01D
1.8V
1.2V
2.3V
XCM520xx02D
1.8V
1.3V
2.3V
XCM520xx03D
1.8V
1.2V
2.2V
XCM520xx04D
1.8V
1.2V
2.8V
XCM520xx05D
1.0V
1.2V
1.8V
XCM520xx06D
0.8V
1.5V
1.8V
Maximum Output Current
Dropout Voltage
Operating Voltage Range
Output Voltage Range
High Accuracy
*Other combinations are available as semi-custom products.
Environmentally Friendly
: EU RoHS Compliant, Pb Free
1/43
XCM520
Series
■PIN
CONFIGURATIOIN
PIN No
VOUT2
EN2
VIN1
VIN2
PGND
Lx
1
XCM520
V
OUT2
EN2
V
IN1
V
IN2
PGND
Lx
V
OUT3
AGND
EN3
EN1
V
SS
V
OUT1
XC6401
V
OUT2
EN2
V
IN
―
―
―
―
―
―
EN1
V
SS
V
OUT1
XC9235/XC9236
―
―
―
V
IN
PGND
Lx
V
OUT
AGND
CE
―
―
―
VOUT2
VOUT1
12
VOUT1
VSS
EN1
EN3
AGND
VOUT3
1
2
3
4
5
6
7
8
9
10
11
12
XC6401
2
EN2
VSS
11
3
VIN
EN1
10
4
VIN
EN/MODE
9
XC9235/9236
5
PGND
AGND
8
6
Lx
VOUT3
7
(TOP VIEW)
VOUT1
12
VSS
11
EN1
10
EN3/MODE
9
1
VOUT2
*1
2
EN2
3
VIN1
4
VIN2
5
VSSD
NOTE:
* The two heat-sink pads on the back side are electrically isolated in the package.
*1: The pad of the regulator should be V
SS
level.
*2: The pad of the DC/DC should be V
SS
level.
* The DC/DC ground pin (No. 5 and 8) should be connected for use.
* The two pads are recommended to open on the board, but care must be taken for
voltage level of each heat-sink pad when they are electrically connected.
VSSA
8
VOUT3
7
*2
6
Lx
(TOP VIEW)
■PIN
ASSIGNMENT
PIN No
1
2
3
4
5
6
7
8
9
10
11
12
XCM520
V
OUT2
EN2
V
IN1
V
IN2
PGND
Lx
V
OUT3
AGND
EN3
EN1
V
SS
V
OUT1
FUNCTIONS
Voltage Regulator Output2
Voltage Regulator ON/OFF Control 2
Voltage Regulator Power Input
DC/DC Power Input
DC/DC Power Ground
DC/DC Inductor Pin
DC/DC Output Voltage
DC/DC Analog Ground
DC/DC ON/OFF Control
Voltage Regulator ON/OFF Control 1
Voltage Regulator Ground
Voltage Regulator Output Voltage 1
2/43
XCM520
Series
■PRODUCT
CLASSIFICATION
●Ordering
Information
(*1)
XCM520①②③④⑤⑥-⑦
DESIGNATOR
①②
③④
⑤⑥-⑦
(*1)
(*2)
DESCRIPTION
Options
Output Voltage combination
Packages
Taping Type
(*2)
SYMBOL
−
−
DR-G
See the chart below
See the chart below
USP-12B01
DESCRIPTION
The XCM520 series is Halogen and Antimony free as well as being fully RoHS compliant.
The device orientation is fixed in its embossed tape pocket.
●DESIGNATOR①②（Combination
of XC6401 series and XC9235/XC9236 series）
①②
AA
AB
AC
AD
AE
AF
AG
AH
COMBINATION OF EACH IC
XC6401FF**＋XC9235A**D
XC6401FF**＋XC9235A**C
XC6401FF**＋XC9236A**D
XC6401FF**＋XC9236A**C
XC6401FF**＋XC9235B**D
XC6401FF**＋XC9235B**C
XC6401FF**＋XC9236B**D
XC6401FF**＋XC9236B**C
DESCRIPTION
F i x e d P W M , f
OSC
=3.0MHz
F i x e d P W M , f
OSC
=1.2MHz
Auto PWM/PFM, f
OSC
=3.0MHz
Auto PWM/PFM, f
OSC
=1.2MHz
F i x e d P W M , f
OSC
=3.0MHz, V
OUT3
C
L
Discharge
F i x e d P W M , f
OSC
=1.2MHz, V
OUT3
C
L
Discharge
Auto PWM/PFM, f
OSC
=3.0MHz, V
OUT3
C
L
Discharge
Auto PWM/PFM, f
OSC
=1.2MHz, V
OUT3
C
L
Discharge
●DESIGNATOR③④（Output
Voltage）
③④
01
02
03
04
05
06
V
OUT1
(VR_1ch)
1.8
1.8
1.8
1.8
1.0
0.8
V
OUT2
(VR_2ch)
1.2
1.3
1.2
1.2
1.2
1.5
V
OUT3
(DC/DC)
2.3
2.3
2.2
2.8
1.8
1.8
*This series are semi-custom products.
For other combinations of output voltages please consult with your Torex sales contact.
3/43
XCM520
Series
■BLOCK
DIAGRAMS
XC9235A/XC9236A
XC9235B/XC9236B
Available with C
L
Discharge, High Speed Soft-Start
* XC9235 control scheme is a fixed PWM because that the “CE/MODE Control Logic” outputs a low level signal to the “PWM/PFM Selector”.
* XC9236 control scheme is an auto PWM/PFM switching because the “CE/MODE Control Logic” outputs a high level signal to the “PWM/PFM Selector”.
XC6401FF
*Diodes inside the circuit are an ESD protection diode and a parasitic diode.
■MAXIMUM
ABSOLUTE RATINGS
PARAMETER
V
IN1
Voltage
V
OUT
Current
V
OUT
Voltage
EN1,EN2 Voltage
V
IN2
Voltage
Lx Voltage
V
OUT3
Voltage
EN3 Voltage
Lx Current
Power Dissipation
USP12-B01
USP12-B01
*3
(PCB mounted)
SYMBOL
V
IN1
I
OUT1
+I
OUT2
*
V
EN1
/ V
EN2
V
IN2
V
LX
V
OUT3
V
EN3
I
LX
Pd
Topr
Tstg
1
RATINGS
6.5
700
*2
UNITS
V
mA
V
V
V
V
V
V
mA
V
OUT1
/ V
OUT2
V
SS
-0.3½V
IN1
+0.3
V
SS
-0.3½6.5
-0.3½6.5
-0.3½V
IN2
+0.3≦6.5
-0.3½6.5
-0.3½6.5
±1500
150
800 (1ch operate)
600 (both 2ch operate)
-40½+85
-55½+125
mW
℃
℃
Operating Temperature Range
Storage Temperature Range
*2. Pd > { (V
IN1
- V
OUT1
)×I
OUT1
+(V
IN1
- V
OUT2
)×I
OUT2
}
*3. The power dissipation figure shown is PCB mounted.
for each channel.
*1. Rating is defined as a total of VR1 and VR2 in the VR bloc.
Please refer to page 41 for details.
Also, the power dissipation value above is
4/43
XCM520
Series
■ELECTRICAL
CHARACTERISTICS
●XCM520AB,
AD (DC/DC BLOCK)
PARAMETER
Output Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Supply Current
Stand-by Current
Oscillation Frequency
PFM Switching Current
PFM Duty Limit
Maximum Duty Ratio
Minimum Duty Ratio
Efficiency
(*2)
V
OUT3
= 1.8V, f
OSC
=1.2MHz, Ta = 25℃
CONDITIONS
When connected to external components,
V
IN2
= V
EN3
=5.0V, I
OUT3
=30mA
When connected to external components,
V
IN2
=V
OUT(E)
+2.0V, V
EN3
=1.0V
(*8)
SYMBOL
V
OUT3
V
IN2
I
OUT3MAX
V
UVLO
I
DD
I
STB
f
OSC
I
PFM
DTY
LIMIT_PFM
D
MAX
D
MIN
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
300
-
0
-
0.55
0.67
0.66
0.77
1.0
1.0
1350
-
UNITS CIRCUIT
V
V
mA
V
μA
μA
kHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μA
μA
mA
ppm/
℃
①
①
①
③
②
②
①
①
①
③
③
①
④
④
−
−
⑤
⑤
⑥
①
V
EN3
=V
IN2
, V
OUT3
=0V,
(*1, *10)
Voltage which Lx pin holding “L” level
XCM520AB
V
IN2
=V
EN3
=5.0V,
V
OUT3
=V
OUT3(E)
×1.1V
XCM520AD
V
IN2
= 5.0V, V
EN3
= 0V, V
OUT3
= V
OUT3(E)
×
1.1V
When connected to external components,
V
IN2
= V
OUT3(E)
+ 2.0V, V
EN3
= 1.0V, I
OUT3
= 100mA
When connected to external components,
(*11)
V
IN2
= V
OUT3(E)
+ 2.0V, V
EN3
= V
IN2
, I
OUT3
= 1mA
(*11)
V
EN3
= V
IN2
= (C-1) I
OUT3
= 1mA
V
IN2
= V
EN3
= 5.0V, V
OUT3
= V
OUT3 (E)
×
0.9V
V
IN2
= V
EN3
= 5.0V, V
OUT3
= V
OUT3 (E)
×
1.1V
When connected to external components,
V
EN3
=V
IN2
=V
OUT3(E)
+1.2V,I
OUT3
= 100mA
(*7)
100
-
-
(*3)
-
-
92
0.35
0.42
0.45
0.52
0.01
0.01
1050
±100
R
L
½
H
Lx SW "H" ON Resistance 1
R
L
½
H
Lx SW "H" ON Resistance 2
R
L
½
L
Lx SW "L" ON Resistance 1
R
L
½
L
Lx SW "L" ON Resistance 2
(*5)
Lx SW "H" Leak Current
I
LEAKH
(*5)
Lx SW "L" Leak Current
I
LEAKL
(*9)
Current Limit
I
LIM
Output Voltage
△V
OUT3
/
Temperature
(V
OUT3
・△topr)
Characteristics
CE "H" Level Voltage
V
EN3H
V
IN2
= V
EN3
= 5.0V, V
OUT3
= 0V, I
LX
= 100mA
(*3)
V
IN2
= V
EN3
= 3.6V, V
OUT3
= 0V, I
LX
= 100mA
(*4)
V
IN2
= V
EN3
= 0V
(*4)
V
IN2
= V
EN3
= 3.6V
V
IN2
= V
OUT3
= 5.0V, V
EN3
= 0V, L
X
= 0V
V
IN2
= V
OUT3
= 5.0V, V
EN3
= 0V, L
X
= 5.0V
V
IN2
= V
EN3
= 5.0V, V
OUT3
= V
OUT3 (E)
×
0.9V
V
OUT3
= 30mA
-40℃
≦
Topr
≦
85℃
V
OUT3
= 0V,
-
-
-
-
-
-
900
-
Applied voltage to V
EN3,
0.65
-
6.0
V
③
(*10)
Voltage changes Lx to “H” level
V
OUT3
=30V,
Applied voltage to V
EN3,
③
CE "L" Level Voltage
V
EN3L
V
SS
-
0.25
V
(*10)
Voltage changes Lx to “L” level
CE "H" Current
I
EN3H
V
IN2
= V
EN3
= 5.0V, V
OUT3
= 0V
- 0.1
0.1
μA
⑤
CE "L" Current
I
EN3L
V
IN2
= 5.0V, V
EN3
= 0V, V
OUT3
= 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
EN3
= 0V
→
V
IN2
, V
OUT3
= 1mA
V
IN2
= V
EN3
= 5.0V, V
OUT3
= 0.8
×
V
OUT3
(E)
Integral Latch Time
t
LAT
1.0
-
20.0
ms
⑦
(*6)
Short Lx at 1Ω resistance
Sweeping V
OUT3
, V
IN2
= V
EN3
= 5.0V, Short Lx at
Short Protection
0.900
1.125
V
⑦
V
SHORT
1Ω resistance, V
OUT3
voltage which Lx becomes “L” 0.675
Threshold Voltage
level within 1ms
Test conditions: Unless otherwise stated, V
IN2
= 5.0V, V
OUT3 (E)
= Nominal 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
IN2
- 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 V
OUT3
with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse
generating.
*7: V
OUT3(E)
+1.2V<2.7V, V
IN2
=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
IN2
∼V
IN2
- 1.2V, "L"＝+ 0.1V
∼
- 0.1V
*11: XCM520A/B series exclude I
PFM
and DTY
LIMIT_PFM
because those are only for the PFM control’s functions.
*The electrical characteristics above are when the voltage regulator block is in stop.
5/43
Analog electronics
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