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PDF XCM517 Data sheet ( Hoja de datos )
| Número de pieza | XCM517 | |
| Descripción | 600mA Synchronous Dual Output Step-Down DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
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XCM517 Series
600mA Synchronous Dual Output Step-Down DC/DC Converters
www.DataSheet4U.com
ETR2425-007
GENERAL DESCRIPTION
The XCM517 series is a multi combination module IC which comprises of two 600mA driver transistor built-in synchronous
step–down DC/DC converter. The XCM517 series is available in an ultra small package USP-12B01 suited for space
conscious applications.
The XCM517 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42 P-channel driver
transistor and 0.52 N-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs enable a high
efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two capacitors connected
externally. Operating voltage range is from 2.7V to 6.0V. With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected
for suiting to your particular application. As for operation mode, the XCM517xA / XCM517xB series are PWM control, the
XCM517xC / XCM517xD series are 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).
The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce
current consumption to as low as 1.0 A or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal
P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower.
APPLICATIONS
Mobile phones, Smart phones
Bluetooth equipment
Personal Device Assistances
Portable games
Digital still cameras, camcorders
TYPICAL APPLICATION CIRCUIT
FEATURES
P-ch Driver Transistor Built-In : ON resistance 0.42Ω
N-ch Driver Transistor Built-In : ON resistance 0.52Ω
Input Voltage Range
: 2.7V ~ 6.0V
High Efficiency
: 92% (TYP.)
Output Current
: 600mA
Oscillation Frequency
: 1.2MHz, 3.0MHz (+15%)
Maximum Duty Cycle
Soft-Start Circuit Built-In
Current Limiter Circuit Built-In
: 100%
(Constant Current & Latching)
Ceramic Capacitor Compatible
Control Methods
: PWM (XCM517xA / XCM517xB)
PWM/PFM Auto (XCM517xC / XCM517xD)
*Performance depends on external components and wiring on the PCB.
Combination of voltage
XCM517xx01D
1 ch
1.2V
2ch
1.8V
XCM517xx02D
XCM517xx03D
XCM517xx06D
1.2V
1.8V
1.5V
3.3V
3.3V
1.8V
XCM517xx07D
1.5V
3.3V
*The other combination of voltage is semi-custom.
VOUT1 1
AGND1 2
EN1 3
VIN2 4
PGND2 5
Lx2 6
VOUT
Lx
XC9235/XC9236
AGND
PGND
CE VIN
VIN CE
XC9235/XC9236
Lx VOUT
(TOP VIEW)
12 Lx1
11 PGND1
10 VIN1
9 EN2
8 AGND2
7 VOUT2
* The dotted lines in the circuit indicates the connection using through-holes at the
backside of the PC board
1/28
1 page  
XCM517
www.DataSheet4US.coemries
ELECTRICAL CHARACTERISTICS
XCM517Ax, 1ch Block /2ch Block VOUT=1.8V, fOSC=1.2MHz, Ta=25℃
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNITS CIRCUIT
Output Voltage
Operating Voltage Range
Maximum Output Current
VOUT
VIN
IOUTMAX
When connected to external components,
VIN=VEN=5.0V, IOUT1=30mA
When connected to external components,
VIN=VOUT(E)+2.0V, VEN=1.0V (*8)
1.764
2.7
600
1.800 1.836
- 6.0
--
V
V
mA
UVLO Voltage
VUVLO
VEN=VIN,VOUT=0V,
Voltage which Lx pin holding “L” level (*1, *10)
1.00 1.40 1.78
V
Supply Current
IDD
VIN=VEN=5.0V, VOUT=VOUT(E)×1.1V
(XCM517AA)
(XCM517AC)
-
-
22 50
15 33
A
Stand-by Current
ISTB VIN=5.0V, VEN=0V, VOUT=VOUT(E)×1.1V
- 0 1.0 A
Oscillation Frequency
fOSC
When connected to external components,
VIN=VOUT(E)+2.0V,VEN=1.0V, IOUT=100mA
1020 1200 1380 kHz
PFM Switching Current
Maximum IPFM Limit
IPFM
MAX IPFM
When connected to external components,
VIN=VOUT(E)+2.0V, VEN=VIN , IOUT=1mA (*11)
VEN=VIN=(C-1) IOUT=1mA (*11)
120 160 200 mA
200 %
Maximum Duty Ratio
MAXDTY
VIN=VEN5.0V, VOUT=VOUT (E)×0.9V
100 -
-%
Minimum Duty Ratio
MINDTY
Efficiency (*2)
EFFI
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leak Current (*5)
Lx SW "L" Leak Current (*5)
Current Limit (*9)
Output Voltage
Temperature
Characteristics
RL H
RL H
RL L
RL L
ILeakH
ILeakL
ILIM
VOUT
VOUT topr
EN "H" Level Voltage
VENH
EN "L" Level Voltage
VENL
VIN=VEN5.0V, VOUT=VOUT (E)×1.1V
When connected to external components,
VEN=VIN VOUT (E)+1.2V (*7), IOUT =100mA
VIN=VEN=5.0V, VOUT=0V,ILX =100mA (*3)
VIN=VEN=3.6V, VOUT=0V,ILX =100mA (*3)
VIN=VEN=5.0V (*4)
VIN=VEN=3.6V, (*4)
VIN=VOUT =5.0V, VEN=0V, LX=0V
VIN=VOUT =5.0V, VEN=0V, LX=5.0V
VIN=VEN=5.0V, VOUT=VOUT (E) 0.9V (*7)
IOUT=30mA
-40 Topr 85
VOUT =0V, Applied voltage to VEN,
Voltage changes Lx to “H” level (*10)
VOUT =0V, Applied voltage to VEN,
Voltage changes Lx to “L” level (*10)
- - 0%
- 92 - %
- 0.35 0.55
- 0.42 0.67
- 0.45 0.66
- 0.52 0.77
- 0.01 1.0
A
- 0.01 1.0
A
900 1050 1350 mA
- 100 - ppm/
0.65 -
6.0 V
VSS - 0.25 V
-
-
EN "H" Current
IENH VIN=VEN=5.0V, VOUT=0V
- 0.1
0. A
EN "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
IENL
tSS
tLAT
VSHORT
VIN=5.0V, VEN=0V, VOUT=0V
When connected to external components,
VEN=0V → VIN , IOUT=1mA
VIN= VEN=5.0V, VOUT=0.8× VOUT(E),
Short Lx at 1Ω resistance (*6)
Sweeping VOUT , VIN=VEN= 5.0V, Short Lx at
1Ω resistance, VOUT voltage which Lx becomes “L”
level within 1ms
- 0.1
0.5
-
1.0
0.1
2.5
1.0 - 20.0
0.675 0.900 1.125
A
ms
ms
V
Test conditions: Unless otherwise stated, VIN = 5.0V, VOUT (E) = Setting voltage
NOTE:
*1: Including hysteresis width of operating voltage.
*2: EFFI = { ( output voltage output current ) ( input voltage input current) } 100
*3: ON resistance ( )= (VIN - Lx pin measurement voltage) 100mA
*4: Design value
*5: When temperature is high, a current of approximately 10 A (maximum) may leak.
*6: Time until it short-circuits DCOUT with GND via 1 of resistor from an operational state and is set to Lx=0V from current limit pulse
generating.
*7: When VOUT(E)+1.2V<2.7V, VIN=2.7V
*8: 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.
*9: Current limit denotes the level of detection at peak of coil current.
*10: "H" VIN VIN - 1.2V, "L" + 0.1V - 0.1V
*11: XCM517xA / XCM517xB series exclude IPFM and MAXIPFM because those are only for the PFM control’s functions.
*12: The electrical characteristics shows 1 channel values when the other channel is stopped.
5/28
5 Page 
OPERATIONAL DESCRIPTION
XCM517
www.DataSheet4US.coemries
The XCM517 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase
compensation circuit, output voltage adjustment resistors, P-channel MOSFET driver transistor, N-channel MOSFET switching
transistor for the synchronous switch, current limiter circuit, UVLO circuit and others. (See the block diagram above.) 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, R1 and R2. 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 1.2MHz or
3.0MHz. 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, R1 and R2. 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.
<Current Limit>
The current limiter circuit of the XCM517 series monitors the current flowing through the P-channel MOS driver transistor
connected to the Lx pin, and features a combination of the current limit mode and the operation suspension mode.
When the driver current is greater than a specific level, the current limit function operates to turn off the pulses from the Lx
pin at any given timing.
When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
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.
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 through . If an over current state continues for a
few ms 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 EN 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 current limit of the XCM517 series can be set at 1050mA at typical. Depending on the state of the PC
Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the board
should be laid out so that input capacitors are placed as close to the IC as possible.
VEN
11/28
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| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet XCM517.PDF ] | |
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