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XC9509 Series
September 30, 2003 Ver. 1
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
! Input Voltage Range ! Output Voltage Range
2.4V ~ 6.0V DC/DC VR VD 0.9 ~ 4.0V (2%) 0.9 ~ 4.0V (2%) 0.9 ~ 5.0V (2%) 600mA 200mA
! Switching Frequency ! Output Current ! Ultra Small Packages ! Ceramic Capacitor Compatible
300kHz, 600kHz, 1.2MHz DC/DC VR
" APPLICATIONS # HDD # CD-R / RW, DVD # PDAs, portable communication modem # Cellular phones # Palmtop computers # Cameras, video recorders
MSOP-10, USP-10
" GENERAL DESCRIPTION
The XC9509 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the DC/DC converter's output. A voltage detector is also built-in. Since the input for the LDO voltage regulator block comes from the input power supply, it is suited for use with various applications. The DC/DC converter block incorporates a P-Channel driver transistor and a synchronous N-Channel switching transistor. With an external coil, diode and two capacitors, the XC9509 can deliver output currents up to 600mA at efficiencies over 90%. The XC9509 is designed for use with small ceramic capacitors. A choice of three switching frequencies are available, 300 kHz, 600 kHz, and 1.2 MHz. Output voltage settings for the DC/DC and VR are set-up internally in 0.1V steps within the range of 0.9V to 4.0V ( 2.0%). For the VD, the range is of 0.9V to 5.0V ( 2.0%). The soft start time of the series is internally set to 5ms. With the builtin U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower. The functions of the MODE pin can be selected via the external control pin to switch the DC/DC control mode and the disable pin to shut down either the DC/DC block or the regulator block.
" FEATURES
Input Voltage Range : Load Capacitors : 2.4V ~ 6.0V Ceramic Capacitors Compatible (Low ESR Capacitors) VD Function : Sense internally either VDD, DCOUT, or VROUT. Nch Open Drain Output

Output Voltage Range : Output Current : Controls : 0.9 ~ 4.0V (2%) 600mA PWM Control PWM, PWM / PFM Automatic Switching External 300kHz, 600kHz, 1.2MHz
Oscillation Frequency :

Output Voltage Range : Current Limit Dropout Voltage : High Ripple Rejection 0.9 ~ 4.0V (2%) 300mA 80mV @ IOUT=100mA (VOUT=2.8V) 60dB @1kHz (VOUT=2.8V)
" TYPICAL APPLICATION CIRCUIT
" TYPICAL PERFORMANCE CHARACTERISTICS
XC9509Hxxxx
SD
VIN=3.6V, Topr=25OC, L:4.7uH(CDRH4D28C) CIN:4.7uF(ceramic), CL1:10uF(ceramic), CL2: 1uF(ceramic)
L CL1 DCOUT
)
100 90 80
VROUT
(
1 2 3 4 CIN1 CIN2 5 CE
PGND
LX DCOUT VROUT MODE AGND
10 9 8 7 CL2 6
DC/DC Efficiency (DCOUT:2.2V, 1.2MHz)
PVDD AVDD VDOUT
Efficiency EFFI (%)
70 60 50 40 30 20 10 0 0.1 1 10 100 1000 PWM/PFM Switching Control PWM Control
MSOP-10 (TOP VIEW)
DC/DC Output Current IDOUT (mA)
Semiconductor Ltd.
Data Sheet
1
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" PIN CONFIGURATION
" PIN ASSIGNMENT
PIN NUMBER 1 2 3
PGND 1 CE 2 PVDD 3 AVDD 4 VDOUT 5
10 LX 9 DCOUT 8 VROUT 7 MODE 6 AGND
PIN NAME PGND CE PVDD AVDD VDOUT AGND MODE VROUT DCOUT LX
FUNCTION Power Ground Chip Enable Power Supply 1 Power Supply 2 VD Input Analog Ground Mode Switch VR Output DC/DC Output Switch
MSOP-10(TOP VIEW) PGND 1 CE 2 PVDD 3 AVDD4 VDOUT 5 10 LX 9 DCOUT 8 VROUT 7 MODE 6 AGND
4 5 6 7 8 9
USP-10 (TOP VIEW)
10
" SELECTION GUIDE
# Ordering Information XC9509
123456
SYMBOL
The input for the voltage regulator block comes from VDD. DESCRIPTION
DESIGNATOR
1 23 4
3 6 C A D R L
Control Methods, the MODE pin, the VD Sense pin (See the chart below) Setting voltage and specifications of each DC/DC, VR, and VD (Based on the internal standard) Oscillation Frequency of DC/DC : 300kHz 600kHz 1.2MHz Package Type : MSOP-10 USP-10 Device Orientation : Embossed Tape : Standard Feed Embossed Tape : Reverse Feed
5 6
% Control Methods, MODE Pins, and VD SENSE Pins
SERIES
1
A B C D E F H K L
DC/DC CONTROL METHODS
MODE PINS (H LEVEL) VR : OFF
MODE PINS (L LEVEL) VR : ON
VD SENSE VDD DCOUT VROUT VDD
PWM Control DC/DC : OFF DC/DC : ON
XC9509
DCOUT VROUT VDD
PWM, PFM/PWM Manual Switch
PFM/PWM Auto Switch
PWM Control
DCOUT VROUT
* The XC9509A to F series' MODE pin switches either the regulator block or DC/DC block to stand-by mode. When the CE mode is off, every function except for the VD function enters into stand-by mode. (The MODE pin does not operate independently.)
Semiconductor Ltd.
Data Sheet
2
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" PACKAGING INFORMATION
% MSOP-10
0.15+0.01 0.53+0.10 -
% USP-10
2.6+0.06
2.7+0.05
3.00+0.10 -
4.90+0.10 -
MAX 0.6
0.30 0.15
0.86+0.05 -
(1.50)
0~ 5
(0.1)
2.30 (0.5) 0.2+0.05
3.00+0.10 -
O
0.25+0.0 6
(0.2)
(0.5 )
" BLOCK DIAGRAM
DCOUT
Phase Compensation
0.075+0.025 -
* Soldering fillet surface is not formed because the sides of the pins are not plated.
PVDD
+ + Logic Buffer, Driver
Vref with soft start
PWM/PFM Controller
Current Limit & Feedback R amp Wave Generator, OSC
LX
CE
ON/OFF, CONTROL
eac h circuit
PGND
eac h circuit MODE CONTROL
MODE
AVDD VROUT
U.V.L.O + Current Li mi t +
VDOUT
+ Vref SENSE (VDD or DCOUT or VROUT)
Vref
AGND
* Diodes shown in the above circuits are protective diodes.
" ABSOLUTE MAXIMUM RATINGS
PARAMETER AVDD Pin Voltage PVDD Pin Voltage DCOUT Pin Voltage VROUT Pin Voltage VDOUT Pin Voltage LX Pin Voltage CE Pin Voltage MODE Pin Voltage Continuous Power Dissipation (*1) Operating Temperature Range Storage Temperature Range (*1) IOUT = Pd / (VIN - VOUT) when PC board mounting. (*2) Package power dissipation
Semiconductor Ltd.
SYMBOL AVDD PVDD DCOUT VROUT VDOUT LX CE MODE MSOP-10 USP-10 Topr Tstg Pd
RATINGS - 0.3 ~ 6.5 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 350 120 (*2) - 40 ~ + 85 - 55 ~ + 125
Ta=25OC UNITS V V V V V V V V mW
O O
C C
Data Sheet
3
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" ELECTRICAL CHARACTERISTICS
XC9509HxxCAx
% Common Characteristics PARAMETER Supply Current 1 Supply Current 2 Stand-by Current (note 1) Input Voltage Range U.V.L.O. Voltage (note 2) CE 'H' Level Voltage CE 'L' Level Voltage CE 'H' Level Current CE 'L' Level Current MODE 'H' Level Voltage MODE 'L' Level Voltage MODE 'H' Level Current MODE 'L' Level Current % DC/DC Converter (2.2V product) PARAMETER Output Voltage Oscillation Frequency Maximum Duty Ratio Manimum Duty Ratio PFM Duty Ratio LX SW 'High' On Resistance (note 3) LX SW 'Low' On Resistance Maximum Output Current Current Limit Efficiency (note 4) Output Voltage Temperature Characteristics Soft Start Time Latch Time (note 5) SYMBOL DCOUT FOSC MAXDUTY MINDUTY PFMDUTY RLXH RLXL IMAX1 ILIM1 EFFI ! VOUT Connected to the external components, IDOUT=100mA CONDITIONS Connected to the external components, IDOUT=30mA Connected to the external components, IDOUT=10mA DCOUT=0V DCOUT=VIN Connected to the external components, No Load DCOUT=0V, LX=VIN-0.05V MIN. 2.156 1.02 100 21 600 TYP. 2.200 1.20 30 0.5 0.5 1.2 90 MAX. 2.244 1.38 0 38 UNITS V MHz % % % mA A % ppm /OC mS mS Ta=25OC SYMBOL IDD1 IDD2 ISTB VIN VUVLO VCEH VCEL ICEH ICEL VMH VML IMH IML CONDITIONS VIN=CE=DCOUT=5.0V VIN=CE=5.0V, DCOUT=0V VIN=6.5V, CE=0V MIN. 2.4 1.00 0.6 VSS - 0.1 - 0.1 0.6 VSS - 0.1 - 0.1 TYP. 300 240 0.6 1.40 MAX. 2.5 6.0 1.78 VDD 0.25 0.1 0.1 VDD 0.25 0.1 0.1 UNITS V V V V V V
TEST CIRCUIT
1 1 1 3 3 3 1 1 3 3 1 1
Ta=25OC
TEST CIRCUIT
3 3 4 4 3 5
3 6 3 3 3 3
Ta=25OC
IDOUT=30mA -40OC-
100
5 8
-
% Regulator (1.8V product) PARAMETER Output Voltage Maximum Output Current Load Regulation Dropout Voltage 1 (note 6) Dropout Voltage 2 Line Regulation Current Limit Short-Circuit Current Ripple Rejection Rate Output Voltage Temperature Characteristics SYMBOL VROUT(E) IMAX2 ! VROUT Vdif 1 Vdif 2 ! VOUT ! VIN # VOUT ILIM2 ISHORT PSRR ! VOUT ! Topr # VOUT 1mATEST CIRCUIT
2 2 2 2 2 2 7 7 2 2
Semiconductor Ltd.
Data Sheet
4
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" ELECTRICAL CHARACTERISTICS (Continued)
% Detector (2.7V product) PARAMETER Detect Voltage Hysteresis Range VD Output Current Output Voltage Temperature Characteristics Test Conditions : SYMBOL VDF VHYS IVD ! VDF ! Topr # VDF VDOUT=0.5V -40OCTEST CIRCUIT
8 9 8
-
100
-
Unless otherwise stated; VD : VIN=6.0V
DC/DC : VIN=3.6V [@ DCOUT:2.2V] VR : VIN = VROUT(T) + 1.0 (V) [When VROUT(T) <1.4V, VIN =2.4V] note 1 : VD operates when in stand-by mode. note 2 : Including hysteresis operating voltage range. note 3 : On resistance = 0.05V / ILX note 4 : EFFI = { ( Output Voltage x Output Current ) / ( Input Voltage x Input Current) } x 100 note 5 : Time until it short-circuits DCOUT with GND through 1 of resistance from a state of operation and is set to DCOUT=0V from current limit pulse generating. note 6 : Vdif = (VIN1 (note 7) - VROUT1 (note 8 ) ) note 7 : VIN 1 = The input voltage when VROUT1 appears as input voltage is gradually decreased. note 8 : VROUT1 = A voltage equal to 98% of the output voltage whenever an amply stabilized IOUT {VROUT(T) + 1.0V} is input.
Semiconductor Ltd.
Data Sheet
5
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" TEST CIRCUITS
Circuit
1
Supply Current, Stand-by Current, CE Current, MODE Current
1 2 3 PGND CE PVDD AVDD VDOUT LX DCOUT VROUT MODE AGND 10 DCOUT : VIN or GND 9 8 7 6
Circuit
2
Output Voltage (VR), Load Stability, Dropout Voltage, CE Current (MODE Current)
1 CE : VIN or GND 2 3 4 CE PVDD AVDD VDOUT DCOUT VROUT MODE AGND 9 8 7 6 MODE: VIN or GND PGND LX 10
A
A
4 5
A
V
5
V
IROUT
CIN:1.0uF (ceramic)
CIN : 4.7uF (ceramic)
CL:1.0uF(ceramic, 2.2uF(ceramic,
VROUT>1.5V) VROUT<1.5V)
Circuit
3 Output Voltage (DC/DC) Oscillation Frequency,
U.V.L.O. Voltage, Soft start Time, Latch Time, CE Voltage, (PFM Duty Cycle), (MODE Voltage)
L 1 2 3 4 CE PVDD AVDD VDOUT PGND LX DCOUT VROUT MODE AGND 10 9 8 7 6 CL : 10uF (ceramic) MODE: VIN or GND
Circuit
4
Minimum Duty Cycle, Maximum Duty Cycle
1 CE : VIN 2 3
PGND CE PVDD AVDD VDOUT
LX DCOUT VROUT MODE AGND
10 9 8 7 6 200
V
IDOUT
4
V
5
V
5
CIN : 4.7uF (ceramic)
FOSC 300kHz 600kHz 1.2MHz
L 22uH 10uH 4.7uH
CIN : 1.0uF (ceramic)
Circuit
5
Lx ON Resistance
Circuit
6
Current Limit 1 (DC/DC)
L
1 CE : VIN 2 3 4 CE
PGND
LX DCOUT VROUT MODE AGND
10 9 8 7 6
A
CE : VIN
1 2 3 4 5 CE
PGND
LX DCOUT VROUT MODE AGND
10 9 8 7 6 MODE: VIN or GND IDOUT
PVDD AVDD VDOUT
PVDD AVDD VDOUT
V
5
CIN : 1.0uF (ceramic)
CIN : 4.7uF (ceramic)
Circuit
7
Current Limit 2 (VR), Short Protection (VR)
Circuit
8
Detect Voltage, Release Voltage
1 CE : VIN 2 3 4 CE
PGND
LX DCOUT VROUT MODE AGND
10 9 8 7 6
M ODE : VIN or GND
VD_SENSE (DCOUT or VROUT)
1 CE : VSS 2 CE
PGND
LX DCOUT VROUT MODE AGND
10 9 8 7 6
PVDD AVDD VDOUT
A
3 4
PVDD AVDD VDOUT
V
5
V
V
CIN:1uF 200k
5
V
CIN : 4.7uF (ceramic)
CL:1.0uF(ceramic)
Circuit
9
Detect Voltage, Release Voltage
1 CE : VSS 2 3 4 CE PVDD AVDD VDOUT DCOUT VROUT MODE AGND 9 8 7 6 PGND LX 10
VD_SENSE (DCOUT or VROUT)
V
CIN:1uF
A
5
Semiconductor Ltd.
Data Sheet
6
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" TYPICAL APPLICATION CIRCUIT
)
SD
FOSC
L CL1 DCOUT
L 4.7H (CDRH4D28C, SUMIDA) 10H (CDRH4D28C, SUMIDA) 22H (CDRH4D28C, SUMIDA)
1 2 3 4 CIN1 CIN2 5 CE
PGND
LX DCOUT VROUT MODE AGND
10 9 8 7 CL2 6
1.2MHz 600kHz
(
PVDD AVDD VDOUT
VROUT
300kHz
CIN CL1
: 4.7F (ceramic, TAIYO-YUDEN) : 10F (ceramic, TAIYO-YUDEN) : 1F (ceramic, TAIYO-YUDEN), VROUT>1.5V
MSOP-10 (TOP VIEW)
CL2
: 2.2F (ceramic, TAIYO-YUDEN), VROUT<1.5V
" OPERATIONAL EXPLANATION
The XC9509 series consists of a synchronous step-down DC/DC converter, a high speed LDO voltage regulator, and a voltage detector.
% DC/DC Converter
The series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, output voltage adjustment resistors, driver transistor, synchronous switch, current limiter circuit, U.V.L.O. circuit and others. The series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the VOUT pin through split resistors. Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage. < Reference Voltage Source > The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter. < Ramp Wave Circuit > The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 300kHz, 600 kHz and 1.2 MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits. < Error Amplifier > The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback voltage divided by the internal split resistors. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer. < PWM/PFM > The PWM mode of the XC9509A to F series are controlled on a specified frequency from light loads through the heavy loads. Since the frequency is specified, the composition of a noise filter etc. becomes easy. However, the efficiency at the time of the light load may become low. The XC9509H to L series can switch in any timing between PWM control and PWM/PFM automatic switching control. The series can not control only PFM mode. If needed, the operation can be set on a specified frequency; therefore, the control of the noise etc. is possible and the high efficiency at the time of the light load during PFM control mode is possible. With the automatic PWM/PFM switching control function, the series ICs are automatically switched from PWM control to PFM control mode under light load conditions. If during light load conditions the coil current becomes discontinuous and on-time rate falls lower than 30%, the PFM circuit operates to output a pulse with 30% of a fixed on-time rate from the Lx pin. During PFM operation with this fixed on-time rate, pulses are generated at different frequencies according to conditions of the moment. This causes a reduction in the number of switching operations per unit of time, resulting in efficiency improvement under light load conditions. However, since pulse output frequency is not constant, consideration should be given if a noise filter or the like is needed. Necessary conditions for switching to PFM operation depend on input voltage, load current, coil value and other factors.
Semiconductor Ltd.
Data Sheet
7
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" OPERATIONAL EXPLANATION (Continued)
< Synchronous / Non-synchronous > The XC9509 series automatically switches synchronous / non synchronous according to the state of the DC/DC converter. In the series, highly efficient operation using the synchronous mode while the coil current is in a continuation state. The series enters non-synchronous operation when the built-in Nch switching transistor for synchronous operation is shutdown which happens when the load current becomes low and the operation changes to a discontinuous state. The IC can operate without an external schottky diode because the parasitic diode in the Nch switching transistor provides the circuit's stepdown operation. However, since Vf of the parasitic diode is high 0.6V, the efficiency level during non-synchronous operation shows a slight decrease. Please use an external schottky diode if high efficiency is required during light load current.
% Continuous Mode : Synchronous
ILmax
% Discontinuous Mode : Non-Synchronous
Coil Current ILmin Coil Current 0mA
ILmax
0mA
LX W ave Form
LX W ave Form
< Current Limit > The current limiter circuit of the XC9509 series monitors the current flowing through the P-channel MOS driver transistor connected to the Lx pin, and features a combination of the constant-current type current limit mode and the operation suspension mode. 1 When the driver current is greater than a specific level, the constant-current type current limit function operates to turn off the pulses from the Lx pin at any given timing. 2 When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state. 3 At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over current state. 4 When the over current state is eliminated, the IC resumes its normal operation. The IC waits for the over current state to end by repeating the steps 1 through 3 . If an over current state continues for 8msec and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the driver transistor, and goes into operation suspension mode. Once the IC is in suspension mode, operations can be resumed by either turning the IC off via the CE pin, or by restoring power to the VIN pin. The suspension mode does not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. The constant-current type current limit of the XC9509 series can be set at 1.2A.
Limit<8mS
*
Limit>8mS
*
Current Limit LEVEL IDOUT 0mA DCOUT VSS LX
CE
Restart
VIN *1.2MHz, Typical
Semiconductor Ltd.
Data Sheet
8
XC9509 Series
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector
" OPERATIONAL EXPLANATION (Continued)
< U.V.L.O. Circuit> When the VIN pin voltage becomes 1.4 V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8 V or higher, switching operation takes place. By releasing the U.V.L.O. function, the IC performs the soft start function to initiate output startup operation. The soft start function operates even when the VIN pin voltage falls momentarily below the U.V.L.O. operating voltage. The U.V.L.O. circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal circuitry remains in operation.
% High Speed LDO Voltage Regulator
The voltage regulator block of the XC9509 series consists of a reference voltage source, error amplifier, and current limiter circuit. The voltage divided by split resistors is compared with the internal reference voltage by the error amplifier. The P-Channel MOSFET, which is connected to the VROUT pin, is then driven by the subsequent output signal. The output voltage at the VROUT pin is controlled and stabilized by a system of negative feedback. A stable output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit is built-in. < Reference Voltage Source > The reference voltage source provides the reference voltage to ensure stable output voltage of the regulator. < Error Amplifier > The error amplifier compares the reference voltage with the signal from VROUT, and the amplifier controls the output of the Pch driver transistor. The voltage regulator block includes a combination of a constant current limiter circuit and a foldback circuit. The voltage regulator senses output current of the built-in P channel output driver transistor inside. When the load current reaches the current limit level, the current limiter circuit operates and the output voltage of the voltage regulator block drops. As a result of this drop in output voltage, the foldback circuit operates, output voltage drops further and the load current decreases. When the VROUT and GND pin are shorted, the load current of about 30mA flows.
% Voltage Detector
The detector block of the XC9509 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally. (N channel Open Drain Type)
The operation of the XC9509 series' DC/DC converter block and voltage regulator block will enter into the shut down mode when a low level signal is input to the CE pin. During the shut down mode, the current consumption occurs only in the detector and is 0.6 A (TYP.), with a state of high impedance at the Lx pin and the DCOUT pin. The IC starts its operation by inputting a high level signal to the CE pin. The input to the CE pin is a CMOS input and the sink current is 0 A (TYP.).
The operation of the XC9509A series' voltage detector block will enter into stand-by mode when a high level signal is input to the MODE pin. When a low level signal is input, the voltage regulator block will enter into stand-by mode. However, if the IC enters into stand-by mode via the CE pin, the voltage regulator block also shuts down. Likewise, if the XC9509B series enters into stand-by mode via the CE pin, the DC/DC converter block can also shut down. With the XC9509C series control can be PWM control when the MODE pin is 'H' level and PWM/PFM automatic switching control when the MODE pin is 'L' level.
Semiconductor Ltd.
Data Sheet
9

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