XCM519
Series
■GENERAL
DESCRIPTION
ETR2421-003
600mA Synchronous Step-Down DC/DC Converter + Low Voltage Input LDO
The XCM519 series is a multi combination module IC which comprises of a 600mA driver transistor built-in synchronous
step–down DC/DC converter and a low voltage input LDO regulator. The device is housed in small USP-12B01 package which
is ideally suited for space conscious applications. Battery operated portable products require high efficiency so that a dual
DC/DC converter is often used. The XCM519 can replace this dual DC/DC to eliminate one inductor and reduce output noise.
The DC/DC converter and the LDO regulator blocks are isolated in the package so that noise interference from the DC/DC to
the LDO regulator is minimal.
A low output voltage and low On-resistance LDO regulator is added in series to the DC/DC output so that one another low output
voltage is created with a high efficiency and low noise. With comparison to the dual DC/DC solution, one inductor can be
eliminated which results in parts reduction and board space saving.
■APPLICATIONS
●
Mobile phones, Smart phones
●
Bluetooth equipment
●
Portable communication modems
●Portable
game consoles
■FEATURES
<DC/DC Convertor Block>
Input Voltage Range
: 2.7V ~ 6.0V
Output Voltage Range : 0.8V ~ 4.0V
High Efficiency
: 92% (TYP.)
Output Current
: 600mA (MAX.)
Oscillation Frequency : 1.2MHz, 3.0MHz (+15%)
Maximum Duty Cycle : 100%
Soft-Start Circuit Built-In
Current Limiter Circuit (Constant Current & Latching)
Built-In
Control Methods
: PWM (XCM519A)
PWM/PFM Auto (XCM519B)
*Performance depends on external components and wiring on PCB wiring.
■
TYPICAL APPLICATION CIRCUIT
(TOP VIEW)
* The dashed lines denote the connection
through-holes at the backside of the PC board.
using
■TYPICAL
PERFORMANCE
CHARACTERISTICS
Dropout Voltage vs. Output Current
VR O UT= 1 .2 V
Dropout Voltage: Vdif(mV)
300
250
200
150
100
50
0
0
100
200
300
400
Output Current: IOUT(mA)
Ta=25℃
VBIAS=3.0V
VBIAS=3.3V
VBIAS=3.6V
VBIAS=4.2V
VBIAS=5.0V
<Regulator Block>
Maximum Output Current : 400mA (Limiter 550mA TYP.)
Dropout Voltage
: 35mV@I
OUT
=100mA (TYP.)
(at V
BIAS
- V
ROUT(E)
=2.4V)
Bias Voltage Range
: 2.5V ~ 6.0V (V
BIAS
- V
ROUT(E)
=0.9V)
Input Voltage Range
: 1.0V ~ 3.0V (V
IN2
≦V
BIAS
)
Output Voltage Range : 0.7V ~ 1.8V (0.05V increments)
High Output Accuracy : ±20mV
Supply Current
: I
BIAS
=25μA
,
I
IN2
=1.0μA (TYP.)
Stand-by Current
: I
BIAS
=0.01μA , I
IN2
=0.01μA (TYP.)
UVLO
: V
BIAS
=2.0V , V
IN2
=0.4V (TYP)
Thermal Shut Down
: Detect 150℃, Release 125℃ (TYP.)
Soft-start Time
: 240μs＠V
ROUT
=1.2V(TYP.)
C
L
High Speed Auto-Discharge
Low ESR Capacitor
Operating Temperature Range
Package
: Ceramic Capacitor Compatible
: -40℃ ~ +85℃
: USP-12B01
VR
1.2V
1.5V
1.2V
1.0V
1.0V
Standard Voltage Combinations : DC/DC
XCM519xx01Dx
1.8V
XCM519xx02Dx
1.8V
XCM519xx03Dx
1.5V
XCM519xx04Dx
1.8V
XCM519xx05Dx
1.5V
*Other combinations are available as semi-custom products.
1/49
XCM519
Series
■PIN
CONFIGURATIOIN
PIN No.
1
2
3
4
5
6
7
8
9
10
11
(TOP VIEW)
12
XCM519
DCOUT
AGND
EN1
V
IN2
V
SS2
VROUT
EN2
NC
V
BIAS
V
IN1
PGND
Lx
XC9235/XC9236
V
OUT
AGND
CE
―
―
―
―
―
―
V
IN
PGND
Lx
XC6601
―
―
―
V
IN
V
SS
V
OUT
CE
―
V
BIAS
―
―
―
(BOTTOM VIEW)
NOTE:
* A dissipation pad on the reverse side of the package should be electrically isolated.
*1: Electrical potential of the XC9235/XC9236’s dissipation pad should be V
SS
level.
*2: Electrical potential of the XC6601’s 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.
■PIN
ASSIGNMENT
PIN No
1
2
3
4
5
6
7
8
9
10
11
12
XCM519
DCOUT
AGND
EN1
V
IN2
V
SS2
VROUT
EN2
NC
V
BIAS
V
IN1
PGND
Lx
FUNCTIONS
DC/DC Block: Output Voltage
DC/DC Block: Analog Ground
DC/DC Block: Chip Enable
Voltage Regulator Block: Power Input
Voltage Regulator Block: Ground
Voltage Regulator Block: Output
Voltage Regulator Block: Enable
No Connection
Voltage Regulator Block: Power Input
DC/DC Block: Power Input
DC/DC Block: Power Ground
DC/DC Block: Switching
2/49
XCM519
Series
■PRODUCT
CLASSIFICATION
●Ordering
Information
XCM519A①②③④⑤
XCM519B①②③④⑤
DESIGNATOR
①
② ③
④
⑤
DC/DC BLOCK：PWM fixed control
DC/DC BLOCK：PWM/PFM automatic switching control
DESCRIPTION
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
Oscillation Frequency and Options
Output Voltage
Package
Device Orientation
●DESIGNATOR①
DC/DC BLOCK
①
A
B
C
D
OSCILLATION
FREQUENCY
1.2M
3.0M
1.2M
3.0M
C
L
AUTO
DISCHARGE
Not Available
Not Available
Available
Available
SOFT START
Standard
Standard
High Speed
High Speed
Voltage Regulator BLOCK
Pull-down
Not Available
Not Available
Not Available
Not Available
●DESIGNATOR②③
②③
01
02
03
04
05
DCOUT
1.8V
1.8V
1.5V
1.8V
1.5V
VROUT
1.2V
1.5V
1.2V
1.0V
1.0V
*When the DCOUT pin is connected to V
IN2
, DCOUT pin output voltage can be fixed in the range of 1.0V∼3.0V.
*This series are semi-custom products.
For other combinations of output voltages please consult with your Torex sales contact.
3/49
XCM519
Series
■BLOCK
DIAGRAMS
XC9235A/XC9236A
Phase
Compensation
XC9235B/XC9236B
(CL放電機½有、 高速½フトスタート）
Available with C
L
Discharge, High Speed Soft-Start
Phase
Compensation
V
OUT
R2
Current Feedback
Current Limit
V
OUT
R2
Current Feedback
Current Limit
Error Amp.
PWM
Comparator
Logic
Synch
Buffer
Drive
Error Amp.
PWM
Comparator
Logic
Synch
Buffer
Drive
R1
Lx
V
IN
R1
VSHORT
Lx
V
IN
VSHORT
Vref with
Soft Start,
CE
PWM/PFM
Selector
Vref with
Soft Start,
CE
PWM/PFM
Selector
CE/
UVLO Cmp
Ramp Wave
Generator
OSC
UVLO Cmp
V
SS
UVLO
R3
Ramp Wave
Generator
OSC
V
SS
CE
UVLO
R3
R4
CE/MODE
Control
Logic
R4
CE/MODE
Control
Logic
XC6601B (Without Pull-down)
* 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”.
*Diodes inside the circuit are an ESD protection diode and a parasitic diode.
■MAXIMUM
ABSOLUTE RATINGS
PARAMETER
V
IN1
Voltage
Lx Voltage
DCOUT Voltage
EN1 Voltage
Lx Current
V
BIAS
Voltage
V
IN2
Voltage
VROUT Current
VROUT Voltage
EN2 Voltage
Power Dissipation
(Ta=25℃)
USP-12B01
SYMBOL
V
IN1
V
Lx
V
DCOUT
V
EN1
I
Lx
V
BIAS
V
IN2
I
VROUT
V
ROUT
V
EN2
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
V
SS
- 0.3
∼
7.0
V
SS
- 0.3
∼
7.0
700
(*1)
Ta=25℃
UNITS
V
V
V
V
mA
V
V
mA
V
V
mW
℃
℃
℃
V
SS
- 0.3∼V
BIAS
+ 0.3
V
SS
- 0.3∼V
IN2
+ 0.3
V
SS
- 0.3
∼
6.5
150
125
-40∼+85
-55∼+125
Junction Temperature
Operating Temperature Range
Storage Temperature Range
(*1)
I
VROUT
=Less than Pd / (V
IN2
-V
ROUT
)
4/49
XCM519
Series
■ELECTRICAL
CHARACTERISTICS
●XCM519xA
(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
DCOUT
=1.8V, f
OSC
=1.2MHz, Ta=25℃
CONDITIONS
When connected to external components,
V
IN1
= V
EN1
=5.0V, I
OUT1
=30mA
When connected to external components,
(*8)
V
IN1
=DCOUT(E)+2.0V, V
EN1
=1.0V
V
EN1
=V
IN1,
DCOUT=0V,
(*1, *10)
Voltage which Lx pin holding “L” level
V
IN1
=V
EN1
=5.0V, DCOUT=DCOUT(E)×1.1V
(XCM519AA)
(XCM519BA)
MIN.
1.764
2.7
600
1.00
-
-
-
1020
120
-
100
-
-
-
-
-
-
-
-
900
-
0.65
V
SS
- 0.1
TYP.
1.800
-
-
1.40
22
15
0
1200
160
200
-
-
92
0.35
0.42
0.45
0.52
0.01
0.01
1050
±100
-
-
-
MAX.
1.836
6.0
-
1.78
50
33
1.0
1380
200
-
-
0
-
0.55
0.67
0.66
0.77
1.0
1.0
1350
-
6.0
0.25
0.1
UNITS CIRCUIT
V
V
mA
V
②
μA
kHz
mA
%
%
%
%
Ω
Ω
Ω
Ω
μA
μA
mA
ppm/
℃
V
V
μA
①
①
①
③
−
②
①
①
①
②
②
①
④
④
−
−
⑤
⑤
⑥
①
③
③
⑤
SYMBOL
V
DCOUT
V
IN1
I
OUT1MAX
V
UVLO
I
DD
I
STB
f
OSC
I
PFM
D
LIMIT_PFM
D
MAX
D
MIN
EFFI
R
LXH
R
LXH
R
LXL
R
LXL
I
LEAKH
I
LEAKL
I
LIM
△DCOUT
/
(DCOUT・△topr)
V
EN1H
V
EN1L
I
EN1H
I
EN1L
V
IN1
=5.0V, V
EN1
=0V, DCOUT=DCOUT(E)×1.1V
When connected to external components,
(*11)
V
IN1
=DCOUT(E)+2.0V,V
EN1
=1.0V, I
OUT1
=100mA
When connected to external components,
(*11)
V
IN1
=V
DCOUT(E)
+2.0V, V
EN1
=V
IN1
, I
OUT1
=1mA
V
EN1
=V
IN1
=(C-1), I
OUT1
=1mA
(*11)
V
IN1
= V
EN1
=5.0V, DCOUT=DCOUT(E)×0.9V
V
IN1
= V
EN1
=5.0V, DCOUT=DCOUT(E)×1.1V
When connected to external components,
(*7)
V
EN1
=V
IN1
＝DCOUT(E)+1.2V
, I
OUT1
=100mA
(*3)
V
IN1
= V
EN1
=5.0V, DCOUT=0V,I
LX
=100mA
V
IN1
= V
EN1
=3.6V, DCOUT=0V,I
LX
=100mA
V
IN1
= V
EN1
=5.0V
V
IN1
= V
EN1
=3.6V
(*4)
(*4)
(*3)
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leak Current
Lx SW "L" Leak Current
Current Limit
Output Voltage
Temperature
Characteristics
(*9)
(*5)
(*5)
V
IN1
= DCOUT=5.0V, V
EN1
=0V, V
LX
=0V
V
IN1
= DCOUT=5.0V, V
EN1
=0V, V
LX
=5.0V
V
IN1
=V
EN1
=5.0V, DCOUT=DCOUT(E)×0.9V
I
OUT1
=30mA
-40℃≦Topr≦85℃
DCOUT=0V, Applied voltage to V
EN,
(*10)
Voltage changes Lx to “H” level
DCOUT=0V, Applied voltage to V
EN,
(*10)
Voltage changes Lx to “L” level
V
IN1
=V
EN1
=5.0V, DCOUT=0V
EN1 "H" Level Voltage
EN1 "L" Level Voltage
EN1 "H" Current
EN1 "L" Current
⑤
V
IN1
=5.0V, V
EN1
=0V, DCOUT=0V
- 0.1
-
0.1
μA
When connected to external components,
①
0.5
1.0
2.5
ms
Soft Start Time
t
SS
V
EN1
=0V
→
V
IN1
, I
OUT1
=1mA
V
IN
= V
EN
=5.0V, DCOUT=0.8× DCOUT(E)
⑦
Latch Time
t
LAT
1.0
-
20.0
ms
(*6)
Short Lx at 1Ω resistance
Sweeping DCOUT, V
IN1
=V
EN1
= 5.0V, Short Lx at
Short Protection
⑦
V
SHORT
0.675
0.900
1.125
V
1Ω resistance, DCOUT voltage which Lx becomes
Threshold Voltage
“L” level within 1ms
Test conditions: Unless otherwise stated, V
IN
= 5.0V, V
DCOUT(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 DCOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse
generating.
*7: V
DCOUT (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: XCM519A series exclude I
PFM
and MAXI
PFM
because those are only for the PFM control’s functions.
* The electrical characteristics above are when the other channel is in stop mode.
5/49
