XC9210 Series
ETR0504_001
Synchronous Step-Down DC / DC Controller ICs
■GENERAL DESCRIPTION
The XC9210 is a synchronous PWM, PWM/PFM controller designed for low voltage step-down DC/DC converter applications.
High efficiency is obtained through the use of a synchronous rectification topology. Efficiencies are maximized by using the low
RDSon N-Channel MOSFET switch which replaces the catch diode used in standard buck circuits.
The operation of the XC9210 series can be switched between PWM and PWM/PFM externally using the MODE pin. In
PWM/PFM mode the XC9210 automatically switches from PWM to PFM during light loads and high efficiencies can be
achieved over a wide range of load conditions.
Output noise is reduced in PWM operation as the frequency is fixed.
The XC9210 has an 0.9V (±2.0%) internal voltage, and using externally connected components, the output voltage can be set freely
between 0.9V to 6.0V. With an internal switching frequency of 300kHz and 180kHz (custom) smaller, low cost external
components can also be used.
Soft-start time is internally set to 10msec offering protection against in-rush currents during start-up and preventing voltage overshoot.
■APPLICATIONS
●PDAs
●Palmtop computers
●Portable audios
●Various power supplies
■TYPICAL APPLICATION CIRCUIT
<XC9210B093K OUTPUT=3.3V>
■FEATURES
Input Voltage Range : 2.0V ~ 10V
Output Voltage Range : 0.9V ~ 6.0V
Oscillation Frequency : 300kHz ±15%
Output Current : More than 2A
Stand-By Function : 3.0μA (MAX. )
Soft-start internally set-up : 10 ms (internally set-up)
Synchronous Step-Down DC/DC Controllers
Maximum Duty Cycle : 100% (TYP.)
PWM and PWM/PFM Externally Selectable
Synchronous Rectification Control
High Efficiency : 95% (TYP.)
Package : MSOP-8A
■TYPICAL PERFORMANCE
CHARACERISTICS
Efficiency vs. Output Current
☆GO-Compatible
Can be set freely with 0.9V
(±2.0%) of reference
(180kHz as custom)
(VIN = 5.0V, VOUT=3.3V)
Tr1:Pch MOSFET
:CPH3308
C
IN
:47μF
EXT1
VDD
PWM
CE MODE
V
IN
:3.3V~10V
PWM
CE
EXT2
GND
FB
MODE
L:22μH
CDRH125
Tr2:Nch MOSFET
:CPH3408
CFB
:62pF
RFB1
:200kΩ
RFB
:75kΩ
CL:
47μFX2
OUT
:3.3V
V
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XC9210 Series
■PIN CONFIGURATION
■PIN ASSIGNMENT
PIN NUMBER PIN NAME FUNCTIONS
1 EXT 1 /
2 VDD Supply Voltage
3 PWM
4 CE
5 MODE
6 FB
External Transistor Drive Pin
<Connected to High Side of P-ch Power MOSFET Gate>
PWM/PFM Switching Pin
<PWM control when connected to VDD, PWM / PFM auto switching when connected to
Ground. >
Chip Enable Pin
<Connected to Ground when output is stand-by mode. Connected to VDD when output is
active. EXT/1 is high and EXT2/ is low when in stand-by mode. >
Synchronous/Non-Synchronous Rectification Switching Pin
<Synchronous operation when MODE pin and PWM pin are connected to V
Non-Synchronous operation when MODE pin and PWM pin are connected to Ground.
Regardless of MODE pin, Non-Synchronous operation when PWM pin is connected to
Ground. >
Output Voltage Monitor Feedback Pin
<Threshold value: 0.9V. Output voltage can be set freely by connecting split resistors
between V
OUT and Ground.>
1 EXT1
2 VDD
3 PWM FB 6
4 CE MODE 8
MSOP-8A
(TOP VIEW)
EXT2 8
GND 7
DD,
7 GND Ground
8 EXT 2
■PRODUCT CLASSIFICATION
●Ordering Information
XC9210①②③④⑤⑥
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
① Type of DC/DC Controller B : Standard type
② ③ Output Voltage 09 : FB Voltage: 0.9V
④ Oscillation Frequency
⑤ Package K : MSOP-8A
⑥ Devise Orientation
External Transistor Drive Pin
<Connected to Low side of N-ch Power MOSFET Gate>
2 : 180kHz (custom)
3 : 300kHz
R : Embossed tape, standard feed
L : Embossed tape, reverse feed
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X
■ BLOCK DIAGRAM
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL RATINGS UNITS
VDD Pin Voltage VDD - 0.3 ~ 12.0 V
FB Pin Voltage VFB - 0.3 ~ 12.0 V
CE Pin Voltage VCE - 0.3 ~ 12.0 V
PWM Pin Voltage VPWM - 0.3 ~ 12.0 V
MODE Pin Voltage VMODE - 0.3 ~ 12.0 V
EXT1, 2 Pin Voltage VEXT - 0.3 ~ VDD + 0.3 V
EXT1, 2 Pin Current IEXT ±100 mA
Power Dissipation Pd 150 mW
Operating Temperature Range Topr - 40 ~ + 85 ℃
Storage Temperature Range Tstg - 55 ~ +125 ℃
C9210
Series
Ta = 2 5 ℃
3/12
(
(
)
C
62p
XC9210 Series
■ ELECTRICAL CHARACTERISTICS
XC9210B093
FOSC = 300kHz) Ta =2 5 ℃
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
CIRCUIT
Supply Voltage VDD MODE = 0V 2.0 - 10.0 V ①
Maximum Input Voltage VIN MODE = 0V 10.0 - - V ①
Output Voltage Range
( *1)
VOUTSET
VIN≧2.0V, MODE = 0V,
I
OUT=1mA
OUT 0.9 - VIN V ①
V
Supply Current 1 IDD1 FB = 0V - 65 120 μA ②
Supply Current 2 IDD2 FB = 1.0V - 65 120 μA ②
Stand-by Current ISTB Same as IDD1, CE = 0V - - 3.0 μA ②
Oscillation Frequency FOSC Same as IDD1 255 300 345 kHz ②
FB Voltage VFB VIN=3.0V, IOUT=10mA 0.882 0.900 0.918 V ③
Minimum Operation Voltage VINmin - - 2.0 V ①
Maximum Duty Ratio MAXDTY Same as IDD1 100 - - % ②
Minimum Duty Ratio MINDTY Same as IDD2 - - 0 % ②
PFM Duty Ratio PFMDTY No Load, VPWM=0V 22 30 38 % ④
Efficiency1
(*2)
EFFI IOUT1=300mA
(*3)
- 96 - % ④
Soft-Start Time TSS VOUT1×0.95V, CE=0V→0.65V 5.0 10.0 20.0 ms ④
EXT1 "High" ON Resistance REXTBH1 CE1 = 0, EXT1= VDD - 0.4V - 26 37 Ω ⑤
EXT1 "Low" ON Resistance REXTBL1 FB = 0V, EXT1 = 0.4V - 19 30 Ω ⑤
EXT2 "High" ON Resistance REXTBH2 EXT2 = VDD - 0.4V - 23 31 Ω ⑤
EXT2 "Low" ON Resistance REXTBL2 CE = 0V, EXT2 = VDD - 0.4V - 19 30 Ω ⑤
PWM "High" Voltage VPWMH No Load 0.65 - - V ④
PWM "Low" Voltage VPWML No Load - - 0.20 V ④
MODE "High" Voltage VMODEH No Load 0.65 - - V ④
MODE "Low" Voltage VMOD EL No Load - - 0.20 V ④
CE "High" Voltage VCEH FB = 0V 0.65 - - V ②
CE "Low" Voltage VCEL FB = 0V - - 0.2 V ②
PWM "High" Current IPWMH - - 0.5 μA ②
PWM "Low" Current IPWML PWM=0V - - - 0.5 μA ②
MODE "High" Current IMODEH - - 0.5 μA ②
MODE "Low" Current IMODEL MODE = 0V - - - 0.5 μA ②
CE "High" Current ICEH - - 0.5 μA ②
CE "Low" Current ICEL CE = 0V - - - 0.5 μA ②
FB "High" Current IFBH - - 0.50 μA ②
FB "Low" Current IFBL FB = 1.0V - - - 0.50 μA ②
Unless otherwise stated, VDD = 3.0V, CE = 3.0V, PWM = 3.0V, FB = 3.0V, EXT1, 2=OPEN, MODE = 3.0V, VIN=4.2V
NOTE: *1： Please be careful not to exceed the breakdown voltage level of the peripheral parts.
*2： EFFI={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100
*3： Tr1: CPH3308 (SANYO)
Tr2: CPH3408 (SANYO)
L: 22μH
CL: 16V, 47μF x 2 (Tantalum MCE Series, NICHICEMI)
C
R
R
IN: 16V, 47μF (Tantalum MCE Series, NICHICEMI)
FB1: 200kΩ
FB2: 75kΩ
FB:
F
CDRH125, SUMIDA
4/12
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