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XR2201D
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1.2MHZ，14V Step-up DC/DC Converter
GENERAL DESCRIPTION
The XR2201D is a high frequency, high
efficiency DC to DC converter with an
integrated 4A, 0.1Ω power switch capable
of providing an output voltage up to 14V.
The fixed 1.2MHz allows the use of small
external inductions and capacitors and
provides fast transient response. It
integrates Soft start, Comp,. only need few
components outside.
FEATURES
z 2.3V to 6V input voltage Rangel
z Efficiency up to 96%
z 14V Boost converter with 4A switch
current
z 1.2Mhz fixed Switching Frequency
z Integrated soft-start
z Thermal Shutdown
z Under voltage Lockout
z ESD 8KV Pass( HBM )
z 8-Pin MSOP Package
APPLICATIONS
• Handheld Devices
• GPS Receiver
• Digital Still Camera
• Portable Applications
• DSL Modem
• PCMCIA Card
• TFT LCD Bias Supply
Figure 1. Typical Application Circuit1
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XR2201D
A
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Figure 2. Typical Application Circuit2
ORDERING INFORMATION
PART
NUMBER
XR2201D -40°C to 85°C 1.2MHZ
TEMP RANGE
SWICHING
FREQUENCY
PIN CONFIGURATION
PIN DESCRIPTION
PIN
NUMBER
1 NC Not use
2 FB Feedback pin
PIN
NAME
OUTPUT
VOLTAGE (V)
DJ 4 MSOP 8
Figure 3. PIN Configuration
PIN DESCRIPTION
ILIM (A) PACKAGE PINS
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3 EN Shutdown control input., Connect this pin to logic high level to enable the device
4 PGND Power ground
5 SW Switch pin
6 IN Input power supply pin
7 NC Not use
8 NC Not use
ABSOLUTE MAXIMUM RATINGS
(Note: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating
conditions for long periods may affect device reliability.)
PARAMETER VALUE UNIT
Supply Voltage VIN -0.3 to 6.5 V
FB, EN Voltage -0.3 to VIN+0.3 V
SW Voltage Vin+0.3 to 15V V
Operating Ambient Temperature
Maximum Junction Temperature 150 °C
Storage Temperature -55 to 150 °C
Lead Temperature (Soldering, 10 sec) 300 °C
-40 to 85 °C
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, TA= 25°C unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Input Voltage Range V
Boost output voltage range Vout 14 V
Operating Supply Current
I
SUPPLY
Shutdown Supply Current
Regulated Feedback Voltage V
Peak Inductor Current I
Oscillator Frequency F
PEAK
OSC
Rds(ON) of N-channel FET ISW =-100mA 0.1 0.2 Ohm
Enable Threshold VIN = 2.3V to 5.5V 0.3 1 1.5 V
2.3 6.0 V
IN
=1.5V，EN=Vin, I
V
FB
Load
=0
75 135
µA
VEN =0V, VIN =4.2V 0.1 1
1.21 1.24 1.27 V
FB
4.0 A
0.9 1.2 1.5 MHz
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Enable Leakage Current -0.1 0.1 µA
SW Leakage Current
VEN = 0V, VSW = 0V or 5V, VIN = 5V
1 uA
Figure 4. Functional Block Diagram
FUNCTIONAL DESCRIPTION
NORMAL OPERATION
The boost converter is designed for output
voltage up to 14V with a switch peak current limit of
4.0 A. The device, which operates in a current
mode scheme with quasi-constant frequency, is
externally 1.2MHZ and the minimum input voltage is
2.3 V. To control the inrush current at start-up a softstart pin is available.
During the on-time, the voltage across the
inductor causes the current in it to rise. When the
current reaches a threshold value set by the internal
GM amplifier, the power transistor is turned off, the
energy stored into the inductor is then released and
the current flows through the Schottky diode
towards the output of the boost converter. The off-
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time is fixed for a certain Vin and Vs, and therefore
maintains the same frequency when varying these
parameters.
However, for different output loads, the
frequency may slightly change due to the voltage
drop across the Rdson of the power transistor
which will have an effect on the voltage across the
inductor and thus on
Some slight frequency changes might also appear
with a fixed output load due to the fact that the
output voltage Vs is not sensed directly but via the
SW Pin, which affects accuracy.
Because of the quasi-constant frequency
behavior of the device , the XR2201D eliminates
the need for an internal oscillator and slope
T (
on
T remains fixed).
off
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compensation, which provides better stability for the
system over a wide of input and output voltages
range, and more stable and accurate current
limiting operation compared to boost converters
operating with a conventional PWM scheme .The
XR2201D topology has also the benefits of
providing very good load and line regulations, and
excellent load transient response.
UNDERVOLTAGE LOCKOUT (UVLO)
To avoid mis-operation of the device at low input
voltages an under voltage lockout is included that
disables the device, if the input voltage falls below
2.2V
THERMAL SHUTDOWN
A thermal shutdown is implemented to prevent
damages due to excessive heat and power
dissipation. Typically the thermal shutdown
threshold is 150℃ .When the thermal shutdown is
triggered the device stops switching until the
temperature falls below typically 136℃ .Then the
device starts switching again.
APPLICATION INFORMATION
INDUCTOR SELECTION
In normal operation, the inductor maintains continuous current to the output. The inductor current has
a ripple that is dependent on the inductance value. The high inductance reduces the ripple current.
Selected inductor by actual application:
Manufa
cturer
Murata
TDK
Part Number Inductance
(uH)
LQH44PN
LQH5BP
SPM6530T
VLP6045
LT
2.2 0.049
3.3 0.065
4.7 0.08
10 0.16
2.2 0.030
3.3 0.044
4.7 0.058
10 0.106
2.2 0017
3.3 0.027
4.7 0.036
2.2 0.020
3.3 0.025
4.7 0.029
DRC max
(Ohms)
Dimensions
L*W*H(mm3)
4*4*1.7
5*5*2
7.1*6.5*3
6*6*4.5
10 0.055
744373
H
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24022
744777004 4.7 0.025 7.3*7.3*4.5
2.2 0.061
Table 1. Recommend Surface Mount Inductors
4.4*4.05 WURT
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If output voltage is 5V ，you can use 2.2uH~ 4.7uH, If output voltage is 12V, 4.7uH~ 10uH is OK，
Normal application: Input 3.3V (3.6V or 4.2V) to Output 5V 9V 12V ；
Input 5V to Output 9V 12V
Notes：Please select inductor according to I in. The IL need to be 1.5~2*I in. For getting higher efficiency, need to
use low DRC inductors.
INPUT CAPACITOR SELECTION
The input capacitor reduces input voltage ripple to the converter, low ESR ceramic capacitor is highly
recommended. For most applications, A 22uF or two 10uF ceramic capacitor is used. The input capacitor
should be placed as close as possible to VIN and GND. If use typical application circuit 2 for 5Vout，suggest to
add one 1uF between Pin-IN and GND and make sure this capacitor close to Pin-IN。 Such as Murata
GRM21BR60J226\ GRM21BR60J106 or TDK C3216X5R1A226M\ C3216X5R1A106M
OUTPUT CAPACITOR SELECTION
A low ESR output capacitor is required in order to maintain low output voltage ripple. In the case of ceramic
output capacitors, capacitor ESR is very small and does not contribute to the ripple, so a lower capacitance
value is acceptable when ceramic capacitors are used. A 22uF or two 22uF、two 10uF ceramic output capacitor
is suitable for most applications. Such as GRM21BR60J226 or TDK C3216X5R1A226M
OUTPUT VOLTAGE PROGRAMMING
In the adjustable version, the output voltage is set by a resistive divider according to the following equation:
Typically choose R2=10K and determine R1 from the following equation:
DIODE SELECTION
According to max Iout and max Vout, you can select suitable diode. Normally we select diode
If=(1.5~2)*Ioutmax and VR=(1.5~2)*Voutmax. For high efficiency，suggest that you select low Vf Schottky
diode.
For example, 3.3V~4.2Vin 5V 1Aout, you can select MBRA210LT3 or SS34. Using MBRA210LT3, you can
get higher efficiency.
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TYPICAL PERFORMANCE CHARACTERISTICS
(L=2.2uH-SPM6530T2R2, CIN=22uF, COUT=22uF, D=MBRA210LT3 Vin=3.6V Vout=5V if not mentioned)
5VOUT (TYPICAL APPLICATION CIRCUIT1)
5VOUT (TYPICAL APPLICATION CIRCUIT2)
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9VOUT (TYPICAL APPLICATION CIRCUIT1)
12VOUT (TYPICAL APPLICATION CIRCUIT1)
NOTES:
The efficiency is tested under normal temperature, the actual current driver capability is 70%
~90% of the max current in sheet consider of high temperature surrounding status
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PWM SWITCHING CONTINUOUS PWM SWITCHING DISCONTINUOUS
CONDUCTION MODE CONDUCTION MODE
LOAD TRANSIENT WAVE(5VOUT 0A~1A) LOAD TRANSIENT WAVE(5VOUT 0.2A~1A)
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PACKAGE OUTLINE
MSOP8 PACKAGE OUTLINE AND DIMENSIONS
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PROUCT CHANGE NOTICE LIST
NO Updated date Version update Update content
1 2012-8-2 Rev 0.1 Create datasheet
2 2012-8-14 Rev 0.2 Update efficiency data
3 2012-10-24 Rev 0.3 Update capacity selection
4 2012-11-30 Rev 0.4 Update Electrical Characteristics
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