Document
XCL201/XCL202 Series
ETR28002-009
Inductor Built-in Step-Down “micro DC/DC” Converters
☆Green Operation Compatible
■GENERAL DESCRIPTION
The XCL201/XCL201 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.5mm×2.0mm, h=1.0mm). A stable power supply with an output current of 400mA is configured using only two capacitors connected externally.
Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of 0.05V. The device is operated by 1.2MHz, and includes 0.42Ω P-channel driver transistor and 0.52Ω N-channel switching transistor. As for operation mode, the XCL201 series is PWM control, the XCL202 series is 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). During stand-by, the device is 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 driver transistor is forced OFF when input voltage becomes 1.4V or lower.
The series provide short-time turn-on by the soft start function internally set in 0.25ms. The series integrate CL auto discharge function which enables the electric charge stored at the output capacitor CL to be discharged via the internal autodischarge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function.
■APPLICATIONS
●Mobile phones, Smart phones ●Bluetooth Headsets ●WiMAX PDAs, MIDs, UMPCs ●Portable game consoles ●Digital cameras, Camcorders ●SSD(Solid State Drive) ●PND(Portable Navigation Device)
■FEATURES
Ultra Small
: 2.5mm×2.0mm, h=1.0mm
Input Voltage
: 2.0V ~ 6.0V
Output Voltage
: 0.8V ~ 4.0V (±2.0%)
High Efficiency
: 92% (VIN=4.2V,VOUT=3.3V)
Output Current
: 400mA
Oscillation Frequency
: 1.2MHz (±15%)
Maximum Duty Cycle
: 100%
Output Capacitor
: Low ESR Ceramic
Function
: Current Limiter Circuit
(Constant Current & Latching)
Soft-Start Circuit Built-In
CL Discharge
Control Methods
: PWM (XCL201)
PWM/PFM Auto (XCL202)
Operating Ambient Temperature : -40℃ ~ 85℃
Environmentally Friendly : EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT
CL 10μF
400mA
L1
LX
VIN
Vss
Vss
VOUT
CE
L2
CIN 4.7μF
(TOP VIEW) * “L1 and LX”, and “L2 and VOUT” is connected by wiring.
Efficency:EFFI(%)
■ TYPICAL PERFORMANCE CHARACTERISTICS
XCL201B331BR/XCL202B331BR
100
XCL202(PWM/PFM)
80
60
VIN= 5.5V
40
5.0V
XCL201(PWM)
20
4.2V
0
0.01
0.1
1
VOUT=3.3V
10
100 1000
Output Current:IOUT (mA)
1/22
XCL201/XCL202 Series
■BLOCK DIAGRAM
L2 VOUT
VIN VSS
Inductor
Phase Compensation
R1 CFB FB
Error Amp.
R2 VSHORT
Current Feedback Current Limit
PWM Comparator
Logic
Synch Buffer Drive
Vref with Soft Start,
CE
PWM/PFM Selector
UVLO Cmp R3 UVLO
Ramp Wave
Generator OSC
CE/
CE
R4
Control
Logic
L1
Lx VSS CE
NOTE: The XCL201 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to "L" level inside. The XCL202 control scheme is PWM/PFM automatic switching, a signal from CE Control Logic to PWM/PFM Selector is fixed to "H" level inside. The diodes placed inside are ESD protection diodes and parasitic diodes.
■PRODUCT CLASSIFICATION
●Ordering Information
XCL201①②③④⑤⑥-⑦(*1) Fixed PWM control XCL202①②③④⑤⑥-⑦(*1) PWM / PFM automatic switching control
DESIGNATOR
ITEM
SYMBOL
DESCRIPTION
①
Functions selection
B
CL auto discharge, High speed soft-start
②③
Output Voltage
08 ~ 40
Output voltage options e.g. 1.2V → ②=1, ③=2
1.25V → ②=1, ③=C 0.05V increments :
0.05=A, 0.15=B, 0.25=C, 0.35=D, 0.45=E, 0.55=F, 0.65=H, 0.75=K, 0.85=L, 0.95=M
④ ⑤⑥-⑦
Oscillation Frequency
Package (Order Unit)
1 BR-G(*2) ER-G(*3)
1.2MHz CL-2025 (3,000pcs/Reel) CL-2025-02 (3,000pcs/Reel)
(*1) The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant. (*2) BR-G is storage temperature range "-40℃ ~ 105℃”.
(*3) ER-G is storage temperature range "-40℃ ~ 125℃".
2/22
■PIN CONFIGURATION
XCL201/XCL202
Series
VIN 6 Vss 5 CE 4
L1 7
1 Lx
2 Vss 3 VOUT
8 L2
(BOTTOM VIEW)
* It should be connected the VSS pin (No. 2 and 5) to the GND pin. * If the dissipation pad needs to be connected to other pins, it should be connected to the GND pin. * Please refer to pattern layout page for the connecting to PCB.
■PIN ASSIGNMENT
PIN NUMBER
1 2,5 3 4 6 7 8
PIN NAME
Lx VSS VOUT CE VIN L1 L2
FUNCTIONS
Switching Output Ground
Output Voltage Chip Enable Power Input
Inductor Electrodes
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
VIN Pin Voltage LX Pin Voltage
VOUT Pin Voltage CE Pin Voltage
LX Pin Current Power Dissipation (Ta = 25℃)
Operating Ambient Temperature
Storage Temperature (*.