XCL211/XCL212
Series
2.0A Inductor Built-in Step-Down “micro DC/DC” Converters
ETR28006-001
☆GreenOperation
Compatible
■GENERAL
DESCRIPTION
The XCL211/XCL212series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in
one tiny package (3.1mm×4.7mm, h=1.3mm).
An internal coil simplifies the circuit and enables minimization of noise and other operational trouble due to the circuit wiring.
A wide operating voltage range of 2.7V to 6.0V enables support for applications that require an externally set output voltage can
be selected. The XCL211/XCL212 series uses synchronous rectification at an operating frequency of 2.4MHz. PWM control
(XCL211) or automatic PWM/PFM switching control (XCL212) can be selected. The XCL211 series has a fixed frequency,
enabling the suppression of output ripple. The XCL212 series achieves high efficiency while holding down output ripple across the
full range of loads, from light to heavy, enabling the extension of battery operation time.
The series have a high speed soft-start as fast as 1ms in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock
Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.4V or lower. It’s suitable for
large-current application due to limit current is configured 4.0A in typical. The integrated C
L
discharge function which enables the
electric charge at the output capacitor C
L
to be discharged via the internal discharge switch located between the LX and GND
pins. Due to C
L
discharge function, malfunction on LX is prevented when Stand-by mode.
■APPLICATIONS
●Note
PCs
●Printers
●Tablet
PCs
●PND(Portable
Navigation Device)
■FEATURES
Package Size
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Control Methods
Functions
: 3.1mm×4.7mm, h=1.3mm
: 2.7V½6.0V
: 0.9V½V
IN
(FB Voltage=0.8V±2%)
: 94% (V
IN
=5.0V, V
OUT
=3.3V)
: 2.0A
: 2.4MHz (±15%)
: 100%
: PWM (XCL211)
PWM/PFM (XCL212)
: Current Limit Circuit (automatic return)
Soft-Start Circuit Built-In
C
L
Discharge, UVLO
Output Capacitor
: Low ESR Ceramic Capacitor
Operating Ambient Temperature : -40℃½+85℃
Package
: USP-11B01
Environmental Friendly : EU RoHS Compliant, Pb Free
■TYPICAL
APPLICATION CIRCUIT
■
TYPICAL PERFORMANCE
CHARACTERISTICS
XCL211B082DR /XCL212B082DR
100
XCL212
80
Efficiency : EFFI (%)
XCL211
60
40
V
IN
=5.0V
V
OUT
=3.3V
20
0
0.1
1
10
100
1000
10000
Output Current : I
OUT
(mA)
1/16
XCL211/XCL212
series
■BLOCK
DIAGRAM
XCL211/XCL212 Series (USP-11B01)
Inductor
L2
UVLO Cmp
L1
UVLO
R1
Current Feedback
Current Limit
R2
AV
IN
PV
IN
Error
Amp.
FB
Vref with
Soft Start,
CE
CE
Control
Logic
Phase
Compensation
PWM
Comparator
Logic
Synch
Buffer
Drive
Lx
Ramp Wave
Generator
OSC
CE/B
CE
Thermal
Shutdoun
PWM/PFM
Selector
GND
* The XCL211 offers a fixed PWM control, a Control Logic of PWM/PFM Selector is fixed at “PWM” internally.
The XCL212 control scheme is a fixed PWM/PFM automatic switching, a Control Logic of PWM/PFM Selector is fixed at “PWM/PFM automatic
switching” internally.
Diodes inside the circuit are an ESD protection diode and a parasitic diode.
■PRODUCT
CLASSIFICATION
●
Ordering Information
XCL211①②③④⑤⑥
XCL212①②③④⑤⑥
DESIGNATOR
①
②③
④
⑤⑥
(*1)
(*1)
(*2)
Fixed PWM
PWM/PFM Auto Switching
ITEM
SYMBOL
Type
Reference Voltage
Oscillation Frequency
Package (Order Unit)
B
08
2
DR
DESCRIPTION
Refer to Selection Guide
Reference Voltage is fixed at 0.8V
2.4MHz
USP-11B01
(*2)
(1,000pcs/Reel)
Halogen free and EU RoHS compliant.
The USP-11B01 reels are shipped in a moisture-proof packing.
●
Selection Guide
SOFT-START
TYPE
TIME
B
Fixed
CHIP
ENABLE
Yes
CURRENT
LIMITER
Yes
THERMAL
SHUTDOWN
Yes
UVLO
Yes
C
L
AUTO-
DISCHARGE
Yes
2/16
XCL211/XCL212
Series
■PIN
CONFIGURATION
AV
IN
CE
FB
NC
GND
PV
IN
NC
Lx
Lx
USP-11B01
(BOTTOM VIEW)
* Please connect the AV
IN
pin (No.7) and the PV
IN
pin (No.9) when operating.
* Please connect the L
X
pins (No.2 and No.3).
■PIN
ASSIGNMENT
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
PIN NAME
NC
Lx
Lx
NC
FB
CE
AV
IN
GND
PV
IN
L1
L2
FUNCTIONS
No Connection
Switching Output
Switching Output
No Connection
Output Voltage Monitor
Chip Enable
Analog Input
Ground
Power Input
Inductor Electrodes
Inductor Electrodes
■CE
PIN FUNCTION
PIN NAME
CE
SIGNAL
Low
High
STATUS
Stand-by
Active
* Please do not leave the CE pin open.
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
PVIN Pin Voltage
AVIN Pin Voltage
CE Pin Voltage
FB Pin Voltage
Lx Pin Voltage
Lx Pin Current
Power Dissipation
USP-11B01
Operating Ambient Temperature
Storage Temperature
(*1)
(*2)
(*3)
SYMBOL
V
PVIN
V
AVIN
V
CE
V
FB
V
Lx
I
Lx
Pd
Topr
T
stg
RATINGS
-0.3 ~ +7.0
(*1)
-0.3 ~ +7.0
-0.3 ~ +7.0
-0.3 ~ +7.0 or V
PVIN
+0.3
(*2)
±6.0
(*3)
1000
-40 ~ +85
-55 ~ +125
UNIT
V
V
V
V
A
mW
℃
℃
All voltages are described based on the ground voltage of GND.
Please connect PV
IN
pin (No.9) and AV
IN
pin (No.7) for use.
The maximum value should be either +7.0 or V
PVIN
+0.3 in the lowest.
It is measured when the two Lx pins (No.2 and 3) are tied up to each other.
3/16
XCL211/XCL212
series
■
ELECTRICAL CHARACTERISTICS
XCL211B082DR/XCL212B082DR,
PARAMETER
FB Voltage
Operating Voltage Range
Maximum Output Current
UVLO Voltage
Quiescent Current
Stand-by Current
Oscillation Frequency
PFM Switch Current
(*4)
PFM Duty Limit
(*4)
Maximum Duty Cycle
Minimum Duty Cycle
LXSW”H”ON Resistance
LXSW”L”ON Resistance
LXSW”H” Leakage Current
Current Limit
Output Voltage
Temperature
Characteristics
CE ”H” Voltage
CE ”L” Voltage
CE ”H” Current
CE ”L” Current
FB ”H” Current
FB ”L” Current
Soft-Start Time
Thermal Shutdown Temperature
Hysteresis Width
C
L
Discharge Resistance
Inductance
Inductor Rated Current
SYMBOL
V
FB
V
IN
I
OUTMAX
V
UVLO
Iq
I
STB
f
OSC
I
PFM
DTY
LIMIT_PFM
D
MAX
D
MIN
R
LXH
R
LXL
I
LeakH
I
LIM
∆V
OUT
/
(∆topr・V
OUT
)
V
CEH
V
CEL
I
CEH
I
CEL
I
FBH
I
FBL
t
SS
T
TSD
T
HYS
R
DCHG
L
I
DC
V
IN
=5.0V, V
CE
=0V, V
FB
=0.72V, V
Lx
=1.0V
Test Freq.=1.0MHz
∆T=+40℃
V
IN
=5.0V, V
CE
=0V, V
FB
=0.88V, V
Lx
=0V
V
IN
=V
CE
=5.0V, V
FB
=0.72V
(*9)
I
OUT
=100mA
-40℃≦Topr≦85℃
When connected to external components
V
IN
=5.0V, V
FB
=0.72V Applied voltage to V
CE
Voltage changes Lx to “H” level
V
IN
=5.0V, V
FB
=0.72V Applied voltage to V
CE
Voltage changes Lx to “L” level
V
IN
=5.0V, V
CE
=5.0V, V
FB
=0V
V
IN
=5.0V, V
CE
=0V, V
FB
=0V
V
IN
=5.0V, V
CE
=0V, V
FB
=5.0V
V
IN
=5.0V, V
CE
=0V, V
FB
=0V
V
IN
=5.0V, V
CE
=0V
→
5.0V, I
OUT
=1mA
When connected to external components
1.2
GND
-0.1
-0.1
-0.1
-0.1
0.3
-
-
80
-
-
-
-
-
-
-
-
1.0
150
20
130
1.5
2.3
V
IN
0.4
0.1
0.1
0.1
0.1
2.0
-
-
160
-
-
V
V
μA
μA
μA
μA
ms
℃
℃
Ω
μH
A
③
③
⑤
⑤
⑤
⑤
①
-
-
⑥
-
-
-
±100
-
ppm/℃
①
CONDITIONS
V
IN
=5.0V, V
CE
=5.0V
Voltage to start oscillation while
V
FB
=0.72V
→
0.88V
When connected to external components
V
IN
=V
CE
=5.0V
(*1,*2)
Ta=25℃
MIN.
0.784
2.7
2.0
2.00
-
-
2040
-
-
100
-
-
-
-
-
TYP.
0.800
-
-
-
53
0.01
2400
680
180
-
-
0.11
0.12
0.01
4.0
MAX.
0.816
6.0
-
2.68
92
1.00
2760
-
250
-
0
0.21
0.30
(*7)
1.00
(*8)
-
UNIT
V
V
A
V
μA
μA
kHz
mA
%
%
%
Ω
Ω
μA
A
CIRCUIT
③
①
①
③
②
②
①
①
①
③
③
④
-
⑤
④
When connected to external components
V
CE
=5.0V, V
FB
=0.72V
Voltage which Lx pin holding “L” level
(*3)
V
IN
=V
CE
=5.0V, V
FB
=0.88V
V
IN
=5.0V, V
CE
=0V, V
FB
=0.88V
V
IN
=V
CE
=5.0V, I
OUT
=300mA
When connected to external components
V
IN
=V
CE
=6.0V, I
OUT
=1mA
When connected to external components
V
IN
=V
CE
=2.7V, I
OUT
=1mA
When connected to external components
V
IN
=V
CE
=5.0V, V
FB
=0.72V
V
IN
=V
CE
=5.0V, V
FB
=0.88V
V
IN
=V
CE
=4.0V, V
FB
=0.72V
(*6)
External Components: C
IN1
=20μF(ceramic), C
IN2
=1μF(ceramic), C
L
=20μF(ceramic), R1=15kΩ, R2=30kΩ, C
FB
=1000pF
Condition: Unless otherwise stated,”H”= V
IN
~ V
IN
- 1.2V, “L”= + 0.1V ~ -0.1V
(*1)
Mount conditions affect heat dissipation. Maximum output current is not guaranteed when T
TSD
starts to operate earlier.
(*2)
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.
(*3)
These values include UVLO detect voltage, UVLO release voltage and hysteresis operating voltage range.
UVLO release voltage is defined as the V
IN
voltage which makes Lx pin “H”.
(*4)
XCL211 series exclude I
PFM
and DTY
LIMIT_PFM
because those are only for the PFM control’s functions.
(*5)
On resistance = (V
IN
– Lx pin measurement voltage) / 0.1A
(*6)
Design value
(*7)
When temperature is high, a current of approximately 20μA (maximum) may leak.
(*8)
Current limit denotes the level of detection at peak of coil current.
4/16
XCL211/XCL212
Series
■TEST
CIRCUITS
< Circuit No.① >
L2
PVIN
L1
LX
Wave Form Measure Point
L
C
FB
A
V
IN
C
IN1
C
IN2
CE
GND
AVIN
FB
R1
C
L
A
V
I
OUT
R2
※External Components
C
IN1
：20μF（ceramic）
C
IN2
：1μF（ceramic）
C
L
：20μF（ceramic）
R1 ：15kΩ
R2 ：30kΩ
C
FB
：1000pF（ceramic）
L
：1.5μH(Selected goods)
V
CE
< Circuit No.② >
< Circuit No.③ >
L2
PVIN
L1
LX
FB
L2
PVIN
AVIN
L1
LX
FB
GND
Wave Form Measure Point
A
V
IN
1μF
AVIN
CE
200Ω
V
FB
V
IN
GND
1μF
CE
V
FB
V
CE
V
CE
< Circuit No.④ >
< Circuit No.⑤ >
L2
PVIN
AVIN
L1
LX
Wave Form Measure Point
L2
PVIN
L1
LX
FB
GND
I
LeakH
A
I
FB H
A
FB
GND
IL½
V
IN
V
FB
1μF
I
CEH
V
CE
AVIN
A
I
FB L
V
FB
V
IN
1μF
CE
A
I
CEL
CE
V
CE
< Circuit No.⑥ >
L2
PVIN
AVIN
L1
IL½
LX
FB
GND
A
V
V
FB
V
Lx
V
IN
1μF
CE
V
CE
5/16
京公网安备 11010802033920号
EEWORLD
