XC9217A33C [TOREX]
500mA Synchronous Step-Down DC/DC Converters;
| 型号： | XC9217A33C |
| 厂家： | 
Torex Semiconductor |
| 描述： | 500mA Synchronous Step-Down DC/DC Converters |
| 文件： | 总21页 (文件大小：239K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
XC9215 / 9216 / 9217 Series
March 22, 2004 V4
500mA Synchronous Step-Down DC/DC Converters
* GO (Green Operation) Compatible
ꢀ Synchronous Step-down DC/DC Converter
ꢀ APPLICATIONS
ꢀ High Efficiency
92%
ꢁ Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)
ꢁ Bluetooth equipment
ꢀ Low Ripple Rejection
ꢀ Output Current
10mV
500mA
ꢁ PDA, Portable communication modem
(VIN=3.0V, VOUT=1.8V)* ꢁ Portable game
ꢀ Oscillation Frequency
ꢀ PWM fixed control
600kHz, 1.2MHz
(XC9215 series)
ꢁ Camera, Digital camera
ꢁ Cordless phone
ꢀ PWM / PFM automatic switching control (XC9216 series)
ꢁ Note book computer
ꢀ Manual selection of switching control
ꢀ Maximum Duty Ratio
(XC9217 series)
100%
ꢀ Ceramic Capacitor Compatible
ꢀ Ultra Small Packages
SOT-25, USP-6B
ꢀ GENERAL DESCRIPTION
ꢀ FEATURES
The XC9215/9216/9217 series is a group of synchronous-rectification type
DC/DC converters with a built-in 0.6 Ω P-channel driver transistor and
0.7Ω 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 500 mA to be configured using only a coil and two
capacitors connected externally.
P-ch Driver Tr. Built-in
N-ch Synchronous Driver Tr. Built-in
Input Voltage Range
: ON resistance 0.6Ω
: ON resistance 0.7Ω
: 2.0V ~ 6.0V
Output Voltage Range
High Efficiency
: 0.9V ~ 4.0V (100mV step)
: 92% (TYP.)
(VIN=3.0V, VOUT=1.8V,
IOUT=100mA )*
Minimum operating voltage is 2.0 V. Output voltage is internally
programmable in a range from 0.9 V to 4.0 V in increments of 0.1 V
(accuracy: ± 2.0%).
With the built-in oscillator, oscillation frequency is selectable from 600 kHz
and 1.2MHz to make available the frequency best suited to your particular
application.
As for operation mode, the XC9215 series is PWM control, the XC9216
series is automatic PWM/PFM switching control and the XC9217 series
can be manually switched between the PWM control mode and the
automatic PWM/PFM switching control mode, allowing fast response, low
ripple and high efficiency over the full range of load (from light load to high
output current conditions).
Output Current
: 500mA
(VIN=3.0V, VOUT=1.8V)*
: 600kHz, 1.2MHz
(Fixed frequency accuracy+15%)
Oscillation Frequency
Soft-start circuit built-in
Current limiter circuit built-in ( constant current + latching)
Low ESR ceramic capacitor compatible
* Performace depends on external components and wiring on the PCB.
The soft start and current control functions are internally optimized. During
standby, all circuits are shutdown to reduce current consumption to as low
as 1.0µA or less. With the built-in 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. Two types of package, 250 mW (SOT-
25) and 100 mW (USP-6B), are available.
ꢀ TYPICAL APPLICATION CIRCUIT
ꢀ TYPICAL PERFORMANCE CHARACTERISTICS
ꢂ
Efficiency vs. Output Current
XC9217A18C
L=3.3uH(CDRH3D16), CIN=4.7uF(ceramic), CL=10uF(ceramic), Topr=25O
C
100
90
80
70
60
50
40
30
20
10
0
VOUT
L
(400mA)
VIN
Lx
1
5
4
VIN
CIN
CL
(ceramic)
VSS
2
3
(ceramic)
CE/MODE
CE/
MODE
VOUT
VIN=5.0V
VIN=3.6V
VIN=2.7V
PWM/PFM Automatic Switching Control
PWM Control
0.1
1
10
Output Current:IOUT(mA)
100
1000
Semiconductor Ltd.
Data Sheet
1
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ PIN CONFIGURATION
Lx
5
VOUT
4
VIN 6
VSS 5
1 LX
2 VSS
3 VOUT
CE/MODE 4
3
1
2
VIN
VSS CE/MODE
SOT-25 (TOP VIEW)
USP-6B (BOTTOM VIEW)
* Please short the VSS pin (pin no. 2 and 5) before use.
Connection of the heat dissipation pad to any pin on the circuit
is not recommended. If the pad must be connected due to a
problem of heat dissipation or mounting intensity, connect to
the VSS pin (pin no. 5).
ꢀ PIN ASSIGNMENT
PIN NUMBER
PIN NAME
FUNCTIONS
SOT-25
USP-6B
1
2
3
4
5
6
2, 5
4
VIN
VSS
Power Input
Ground
CE / MODE
VOUT
Lx
Chip Enable Mode Switch
Output Voltage Sense
Switching Output
3
1
ꢀ PRODUCT CLASSIFICATION
ꢁ Ordering Information
XC9215 1 2 3 4 5 6
XC9216 1 2 3 4 5 6
XC9217 1 2 3 4 5 6
PWM fixed control
PWM / PFM automatic switching control
PWM fixed control ꢀPWM / PFM Automatic Switching, Manual Switching
SYMBOL
DESCRIPTION
Transistor built-in, Output voltage internally set (VOUT product), Soft start Internally set, Current limit 700mA
A: CE input logic High Active, CE pin open
B: CE input logic Low Active, CE pin open
C: CE input logic High Active, Pull-down resistor built-in
D: CE input logic Low Active, Pull-up resistor built-in
Output voltage :
(Standard)
1
(Semi-custom)
(Semi-custom)
(Semi-custom)
2, 3
4
ex. ) 1.5V Output ꢁ 2 = 1, 3 = 5
Oscillation frequency :
6 : 600kHz
C : 1.2MHz
Package Types :
5
M : SOT-25
D : USP-6B
Device Orientation :
R : Embossed Tape : Standard Feed
L : Embossed Tape : Reverse Feed
6
Semiconductor Ltd.
Data Sheet
2
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ
PACKAGING INFORMATION
ꢂ SOT-25
ꢂ
USP-6B
2.0 + 0.15
(0.45) 0.5+0.1
(0.05)
O
1
'
A
O
A
5
4
1
2
3
6
5
4
O
5
4
(0.45) (0.45)
5O
4
5
O
4
1
0.7+0.03
3
2
1
4
5
6
* Pin no. 1 is thicker than other pins.
1
1
1
.
1.0+0.1
0.25+0.1
0.25+0.1
Semiconductor Ltd.
Data Sheet
3
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ
MARKING RULE
ꢂ
SOT-25
Mark 1 Represents product series and the type of DC/DC converter
5
4
SYMBOL
PRODUCT SERIES
E
XC9215AxxxMx
1 2 3 4
F
XC9216AxxxMx
XC9217AxxxMx
1
2
3
G
* Character inversion used.
SOT-25 (TOP VIEW)
Mark 2 Represents the integer of output voltage and oscillation frequency
SYMBOL
OUTPUT
VOLTAGE
FOSC=600kHz
FOSC=1.2MHz
(XC92xxA2x6Mx)
(XC92xxA2xCMx)
0. X
1. X
2. X
3. X
4. X
0
1
2
3
4
0
1
2
3
4
Mark 3 Represents the decimal point of output voltage and oscillation frequency
SYMBOL
OUTPUT
VOLTAGE
FOSC=600kHz
FOSC=1.2MHz
(XC92xxAx36Mx)
(XC92xxAx3CMx)
X. 0
X. 1
X. 2
X. 3
X. 4
X. 5
X. 6
X. 7
X. 8
X. 9
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
H
K
L
M
* Output voltage 0.9V ~ 4.0V (100mV steps) are standard products.
Please ask our sales contact for output voltages of 50mV steps (semi-custom products).
Mark 4 Represents production lot number
0 to 9, A to Z, or inverted characters of 0 to 9 and A to Z repeated (G,I,J,O,Q excepted)
Semiconductor Ltd.
Data Sheet
4
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ
MARKING RULE (Continued)
ꢂ
USP-6B
Mark 1 Represents product series and the type of DC/DC converter
1
2
3
6
5
4
SYMBOL
PRODUCT SERIES
F
XC9215AxxxDx
USP-6B (TOP VIEW)
B
E
XC9216AxxxDx
XC9217AxxxDx
* Character inversion used
Mark 2 Represents the type of DC/DC converter and current limit
SYMBOL
A
PRODUCT SERIES
XC92xxAxxxDx
CURRENT LIMIT
700mA
Mark 3 Represents the integer of output voltage
Mark 4 Represents the decimal point of output voltage
OUTPUT
OUTPUT
SYMBOL
SYMBOL
VOLTAGE
VOLTAGE
(XC92xxA3xxDx)
(XC92xxAx4xDx)
0
1
2
3
4
0
1
2
3
4
5
6
7
8
9
0. X
1. X
2. X
3. X
4. X
X.0
X.1
X.2
X.3
X.4
X.5
X.6
X.7
X.8
X.9
* Output voltage 0.9V ~ 4.0V (100mV steps) are standard products.
Please ask our sales contact for output voltages of 50mV steps (semi-custom products).
Mark 5 Represents oscillation frequency
PRODUCT SERIES
FREQUENCY
SYMBOL
XC92xxAxxCDx
XC92xxAxx6Dx
1.2 MHz
600 kHz
C
6
Mark 6 Represents production lot number
0 to 9, A to Z, or inverted character of 0 to 9 and A to Z repeated (G,I,J,O,Q excepted)
Semiconductor Ltd.
Data Sheet
5
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ
BLOCK DIAGRAM
Phase
VOUT
Compensation
P ch
PWM
Comparator
R1
R2
Driver
Tr.
Buffer
Driver
Logic
VIN
LX
Error Amp.
N ch
SW
Tr.
Current
Vref with
Soft Start,
CE
Limit & Feedback
PWM/PFM
Selector
Ramp Wave
Generator,
OSC
U.V.L.O Comp.
CE/MODE
U.V.L.O.
CE/MODE
VSS
Control Logic
Note:
The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside, and XC9215 series chooses only PWM control.
The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside, and XC9216 series chooses only
PWM/PFM automatic switching control.
ꢀ
ABSOLUTE MAXIMUM RATINGS
Ta=25OC
PARAMETER
VIN Pin Voltage
SYMBOL
VIN
RATINGS
UNIT
V
- 0.3 ~ 6.5
- 0.3 ~ VIN + 0.3
-0.3 ~ 6.5
Lx Pin Voltage
VLx
V
VOUT Pin Voltage
CE / MODE Pin Voltage
Lx Pin Current
VOUT
VCE
V
- 0.3 ~ VIN + 0.3
+1000
V
ILx
mA
SOT-25
USP-6B
250
100
Continuous Power Dissipation
Pd
mW
OC
OC
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
- 40 ~ 85
- 55 ~ 125
Semiconductor Ltd.
Data Sheet
6
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ
ELECTRICAL CHARACTERISTICS
XC9215A18Cxx, XC9216A18Cxx, XC9217A18Cxx
VOUT=1.8V, FOSC=1.2MHz, Ta=25OC
TEST
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
CIRCUIT
When connected to ext. components,
CE=VIN, IOUT=30mA
Output Voltage
VOUT
VIN
1.764
2.0
1.800
1.836
V
V
1
-
-
Operating Voltage Range
6.0
-
1
VIN=3.0V,
When connected to ext. components (*10)
Maximum Output Current
U.V.L.O. Voltage
IOUTMAX
VUVLO
500
1.0
mA
V
1
2
CE=VIN, VOUT=0V, Voltage which Lx pin
voltage holding "L" level (*1)
1.4
1.78
-
-
VIN=CE=3.6V, VOUT=fixed volage x 1.1V
µA
µA
Supply Current
IDD
Istb
70
0
115
1.0
3
3
VIN=3.6V, CE=0V,
VOUT=fixed voltage x 1.1V
Stand-by Current
When connected to ext. components,
IOUT=100mA
Oscillation Frequency
PFM Switch Current
FOSC
IPFM
1020
100
1200
140
1380
180
kHz
mA
1
1
When connected to ext. comonents, CE=VIN,
IOUT=1mA
-
-
-
0
-
Maximum Duty Ratio
Minimum Duty Ratio
MAXDTY CE=VIN, VOUT=0V
MINDTY CE=VOUT=VIN
100
-
%
%
4
4
When connected to ext. components,
Efficiency (*2)
EFFI
-
90
%
1
CE=VIN=3.0V, IOUT=100mA
-
LX SW "H" ON Resistance
LX SW "L" ON Resistance
LX SW "H" Leak Current
RLxH
RLxL
CE=0.5VIN, VOUT=0V, ILx=100mA (*3)
CE=0.5VIN, Ilx=100mA (*4)
0.6
0.7
1.2
1.4
1.0
Ω
Ω
5
-
-
-
-
µA
µA
mA
ILeakH
VIN=VOUT=5.0V, CE=0V, Lx=0V (*5)
0.01
6
LX SW "L" Leak Current
Current Limit
ILeakL
ILIM
VIN=VOUT=5.0V, CE=0V, Lx=5.0V
VIN=CE=5.0V, VOUT=0V
0.01
700
1.0
-
6
7
600
ꢂVOUT
Output Voltage
Temperature Characteristics
CE "H" Voltage
IOUT=30mA
-
+ 100
-
ppm/OC
1
VOUTꢃꢂtopr -40OC<Topr<85OC
VOUT=0V, When CE voltage is applied Lx
determine "H"
VCEH
VCEL
0.9
VSS
-
-
-
-
VIN
0.3
V
V
V
V
8
8
1
1
VOUT=0V, When CE voltage is applied Lx
determine "L"
CE "L" Voltage
When connected to ext. components,
IOUT=1mA (*6)
When connected to ext. components,
IOUT=1mA (*6)
PWM "H" Level Voltage
PWM "L" Level Voltage
VPWMH
VPWML
-
VIN - 1.0
-
VIN - 0.3
-
-
µA
µA
CE "H" Current
CE "L" Current
ICEH
ICEL
VIN=CE=5.5V, VOUT=0V
- 0.1
- 0.1
0.1
0.1
8
8
VIN=5.5V, CE=0V, VOUT=0V
When connected to ext. components,
CE=0V ꢁVIN, IOUT=1mA
Soft-Start Time
TSS
0.5
1.0
3.0
msec
1
When connected to ext. components,
VIN=CE=5.0V,
Latch Time
Tlat
1
-
20
msec
9
Short VOUT by 1Ω resistance (*7)
Test Conditions :
Unless otherwise stated, VIN=3.6V
(*1) Including hysteresis operating voltage range.
(*2) EFFI = { ( Output Voltage x Output Current ) / ( Input Voltage x Input Current) } x 100
(*3) On resistance (Ω)= Lx pin measurement voltage / 100mA
(*4) R&D value
(*5) When temperature is high, a current of approximately 20µA (maximum) may leak.
(*6) The CE/MODE pin of the XC9217A series works also as an external PWM control and PWM/PFM control switching pin. When the IC is in
the operation, control is switched to the PWM mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3 V, and to
the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and equal to
or greater than VCEH.
(*7) Time until it short-circuits DCOUT with GND through 1Ω of resistance from a state of operation
and is set to DCOUT=0V from current limit pulse generating.
(*8) There is no PFM switch current for XC9215 series. The PFM switch current is only for XC9216/17 series.
(*9) There is no PWM "H" Level Voltage or PWM "L" Level Voltage for XC9215/16 series. The characteristics are only for XC9217 series.
(*10) 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.
Semiconductor Ltd.
Data Sheet
7
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ
ELECTRICAL CHARACTERISTICS (Continued)
XC9215A33Cxx, XC9216A33Cxx, XC9217A33Cxx
VOUT=3.3V, FOSC=1.2MHz, Ta=25OC
TEST
PARAMETER
SYMBOL
VOUT
VIN
CONDITIONS
MIN
TYP
MAX
UNIT
CIRCUIT
When connected to ext. components,
CE=VIN, IOUT=30mA
Output Voltage
3.234
3.300
3.366
V
1
-
-
Operating Voltage Range
2.0
6.0
-
V
1
1
VIN=4.5V,
500
mA
When connected to ext. components (*10)
CE=VIN, VOUT=0V, Voltage which Lx pin
voltage holding "L" level (*1)
Maximum Output Current
U.V.L.O. Voltage
IOUTMAX
VUVLO
1.0
1.40
1.78
V
2
-
-
VIN=CE=5.0V, VOUT=fixed volage x 1.1V
VIN=5.0V, CE=0V,
VOUT=fixed voltage x 1.1V
When connected to ext. components,
IOUT=100mA
µA
µA
Supply Current
IDD
Istb
75
0
120
1.0
3
3
Stand-by Current
Oscillation Frequency
PFM Switch Current
FOSC
IPFM
1020
100
1200
140
1380
180
kHz
mA
1
1
When connected to ext. comonents, CE=VIN,
IOUT=1mA
-
-
-
0
-
Maximum Duty Ratio
Minimum Duty Ratio
Efficiency (*2)
MAXDTY CE=VIN, VOUT=0V
MINDTY CE=VOUT=VIN
100
-
%
%
%
4
4
1
When connected to ext. components,
EFFI
-
92
CE=VIN=4.5V, IOUT=100mA
-
-
-
-
LX SW "H" ON Resistance
LX SW "L" ON Resistance
LX SW "H" Leak Current
LX SW "L" Leak Current
Current Limit
RLxH
RLxL
CE=0.5VIN, VOUT=0V, ILx=100mA (*3)
CE=0.5VIN, ILx=100mA (*4)
0.5
0.6
1.0
1.2
1.0
Ω
Ω
5
-
µA
µA
ILeakH
ILeakL
ILIM
VIN=VOUT=5.0V, CE=0V, Lx=0V (*5)
VIN=VOUT=5.0V, CE=0V, Lx=5.0V
VIN=CE=5.0V, VOUT=0V
0.01
0.01
700
6
6
7
1.0
-
600
-
mA
ꢂVOUT
Output Voltage
Temperature Characteristics
CE "H" Voltage
IOUT=30mA
+ 100
-
ppm/OC
1
VOUTꢃꢂtopr -40OC<Topr<85OC
VOUT=0V, When CE voltage is applied Lx
determine "H"
VOUT=0V, When CE voltage is applied Lx
determine "L"
When connected to ext. components,
IOUT=1mA (*6)
VCEH
VCEL
0.9
VSS
-
-
-
-
VIN
0.3
V
V
V
V
8
8
1
1
CE "L" Voltage
PWM "H" Level Voltage
PWM "L" Level Voltage
VPWMH
VPWML
-
VIN - 1.0
-
When connected to ext. components,
IOUT=1mA (*6)
VIN - 0.3
-
-
µA
µA
CE "H" Current
CE "L" Current
Soft-start Time
ICEH
ICEL
TSS
VIN=CE=5.5V, VOUT=0V
- 0.1
- 0.1
0.5
0.1
0.1
3.0
8
8
1
VIN=5.5V, CE=0V, VOUT=0V
When connected to ext. components,
CE=0V ꢁVIN, IOUT=1mA
1.0
msec
When connected to ext. components,
VIN=CE=5.0V,
Latch Time
Tlat
1
-
20
msec
9
Short VOUT by 1Ω resistance (*7)
Test Conditions :
Unless otherwise stated, VIN=5.0V
(*1) Including hysteresis operating voltage range.
(*2) EFFI = { ( Output Voltage x Output Current ) / ( Input Voltage x Input Current) } x 100
(*3) On resistance (Ω)= Lx pin measurement voltage / 100mA
(*4) R&D value
(*5) When temperature is high, a current of approximately 20µA (maximum) may leak.
(*6) The CE/MODE pin of the XC9217A series works also as an external PWM control and PWM/PFM control switching pin. When the IC is in
the operation, control is switched to the PWM mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3 V, and to
the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and equal to
or greater than VCEH.
(*7) Time until it short-circuits DCOUT with GND through 1Ω of resistance from a state of operation
and is set to DCOUT=0V from current limit pulse generating.
(*8) There is no PFM switch current for XC9215 series. The PFM switch current is only for XC9216/17 series.
(*9) There is no PWM "H" Level Voltage or PWM "L" Level Voltage for XC9215/16 series. The characteristics are only for XC9217 series.
(*10) 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.
Semiconductor Ltd.
Data Sheet
8
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ TYPICAL APPLICATION CIRCUIT
FOSC=1.2MHz
VOUT
L
(400mA)
VIN
L :
3.3µH (CDRH3D16 SUMIDA)
Lx
1
5
4
VIN
CIN :
CL :
4.7µF
10µF
(Ceramic)
(Ceramic)
CIN
CL
(ceramic)
VSS
2
3
(ceramic)
CE/MODE
FOSC=600kHz
CE/
MODE
VOUT
L :
6.8µH (CDRH4D18C SUMIDA)
CIN :
CL :
4.7µF
10µF
(Ceramic)
(Ceramic)
ꢀ NOTES ON USE
ꢂ
Application Information
1 The XC9215/16/17 series is designed for use with ceramic output capacitors. If, however, the potential difference between dropout voltage or
output current is too large, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output.
If the input-output potential difference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance.
2 Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by external component
selection, such as the coil inductance, capacitance values, and board layout of external components. Once the design has been completed,
verification with actual components should be done.
3 Depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage may increase.
4 When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the possibility that
some cycles may be skipped completely.
5 When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and there is the
possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.
6 With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when dropout voltage or load
current is high, current limit starts operating, and this can lead to instability. When peak current becomes high, please adjust the coil
inductance value and fully check the circuit operation. In addition, please calculate the peak current according to the following formula:
Ipk = (VIN-VOUT) * OnDuty / (2 x L x FOSC) + IOUT
L
: Coil Inductance Value
FOSC : Oscillation Frequency
7 When the peak current which exceeds limit current flows within the specified time, the built-in Pch driver transistor is turned off. During the time
until it detects limit current and before the built-in transistor can be turned off, the current for limit current flows; therefore, care must be taken
when selecting the rating for the coil or the schottky diode.
8
When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
9 Care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. 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 capacitors are placed as close to the chip as possible.
10 Use of the IC at voltages below the recommended voltage range may lead to instability.
11 This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device.
12 When the IC is used in high temperature, output voltage may increase upto input voltage level at no load because of the leak current of the
driver transistor.
Semiconductor Ltd.
Data Sheet
9
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ NOTES ON USE (Continued)
ꢂ
Application Information (Continued)
13 When the inductance value of the coil is large and under the condition of large dropout voltage in continuous mode, operation may become
unstable. A coil with an inductance value from 3.3µH to 6.8µH should be used. Please verify with actual parts.
ex.)
VOUT=0.9V
FOSC=1.2MHz
VIN=6.0V
IOUT=70mA
CH1:Lx 2V / div
L : 10µH (CDRH4D18C)
CIN : 4.7µF (Ceramic)
CL : 10µF (Ceramic)
CH2:VOUT 20mV / div
5µsec/div
14 The ripple voltage may increase when PFM/PWM automatic switching control changes to PFM control in continuous mode. Please adjust the
inductance value and verify with actual parts.
ex.)
VOUT=1.8V
FOSC=1.2MHz
VIN=2.39V
IOUT=70mA
CH1:Lx 2V / div
L : 3.3µH (CDRH3D16)
CIN : 4.7µF (Ceramic)
CL : 10µF (Ceramic)
CH2:VOUT 20mV / div
100µsec/div
Semiconductor Ltd.
Data Sheet
10
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ NOTES ON USE (Continued)
ꢂ
Application Information (Continued)
ꢁ
Instructions on Pattern Layout
1. In order to stabilize VIN's voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as possible to the VIN & VSS pins.
2. Please mount each external component as close to the IC as possible.
3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit impedance.
4. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high ground currents at the time of
switching may result in instability of the IC.
ꢁ
Recommended Pattern Layout
SOT-25
Ceramic_Cap
Inductor
L
VIN
VOUT
CL
CIN
IC
VSS
VSS
CE
* Please use an electric wire for VIN, VOUT, VSS, and CE.
USP-6B
L
Ceramic_Cap
Inductor
CIN
IC
VOUT
VIN
CE
VSS
VSS
* Please use an electric wire for VIN, VOUT, VSS, and CE.
Semiconductor Ltd.
Data Sheet
11
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ OPERATIONAL EXPLANATION
The XC9215/9216/9217 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 transitor for the 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, 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 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, 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 XC9215 / 9216 / 9217 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 a few msec 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/MODE 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 XC9215 / 9216 / 9217 series can be set at 700mA.
Limit< #mS
Limit> #mS
CurrentLimitLEVEL
IOUT
0mA
VSS
VOUT
LX
CE/MODE
Restart
VIN
< 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.
Semiconductor Ltd.
Data Sheet
12
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ OPERATIONAL EXPLANATION (Continued)
< CE / MODE Pin Function >
The operation of the XC9215A / 9216A / 9217A series will enter into the shut down mode when a low level signal is input to the CE/MODE pin. During
the shut down mode, the current consumption occurs only in the detector and is 0 µA (TYP.), with a state of high impedance at the Lx pin and VOUT pin.
The IC starts its operation by inputting a high level signal to the CE/MODE pin. The input to the CE/MODE pin is a CMOS input and the sink current is 0
µA (TYP.).
ꢁ
XC9215A / 9216A series - Examples of how to use CE/MODE pin
(A)
SW_CE
STATUS
Stand-by
Operation
ON
VIN
VIN
VDD
VDD
OFF
R1
SW_CE
CE/MODE
CE/MODE
(B)
SW_CE
STATUS
Stand-by
Operation
SW_CE
R2
ON
OFF
(A)
(B)
ꢁ
XC9217A series - Examples of how to use CE/MODE pin
(A)
SW_CE SW_PMW/PFM
STATUS
PWM/PFM Automatic Switching Control
PWM Control
ON
OFF
OFF
*
VIN
VIN
VDD
VDD
ON
OFF
RM1
RM2
CE/MODE
Stand-by
SW_PWM/PFM
RM1
SW_CE
CE/MODE
(B)
SW_CE SW_PMW/PFM
STATUS
Stand-by
SW_PWM/PFM
SW_CE
RM2
ON
OFF
OFF
*
(A)
(B)
ON
OFF
PWM Control
PWM/PFM Automatic Switching Control
Intermediate voltage can be generated by RM1 and RM2. Please set the value of each R1, R2, RM1, RM2 at around 100kΩ.
For switches, CPU open-drain I/O port and transistor can be used.
ꢀ FUNCTIONS
CE/MODE
OPERATION
VOLTAGE LEVEL
XC9215A Series
XC9216A Series
XC9217A Series
Synchronous
H Level * 1
M Level * 2
L Level * 3
Synchronous
Synchronous
PWM/PFM Automatic Switching Control
Synchronous
PWM Fixed Control
PWM/PFM Automatic Switching Control
PWM Fixed Control
Stand-by
Stand-by
Stand-by
* CE/MODE pin voltage level range
1. H Level : VIN-0.3V < H Level < VIN
2. M Level :
3. L Level :
0.9V < M Level < VIN-1.0V
0V < L Level < 0.3V
Semiconductor Ltd.
Data Sheet
13
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ TEST CIRCUITS
Circuit 1
Circuit 2
Wave Form Measure Point
L
IOUT
VIN
Lx
A
VIN
Lx
CIN
1µF
Rpulldown
1kΩ
CL
RL
V
CE/
MODE
CE/
MODE
V
VOUT
VOUT
VSS
VSS
1.2MHz
600kHz
4.7µF (Ceramic)
10µF (Ceramic)
4.7µF (Ceramic)
10µF (Ceramic)
CIN
CL
L
3.3µH (CDRH3D16 SUMIDA)
6.8µH (CDRH4D18C SUMIDA)
Circuit 3
Circuit 4
Oscillation Check Point
A
VIN
Lx
VIN
Lx
1µF
1µF
Rpulldown
200Ω
CE/
MODE
V
CE/
MODE
VOUT
VOUT
VSS
VSS
Circuit 5
Circuit 6
ILeakH
A
VIN
L x
VIN
CE/
Lx
1µ F
ILeakL
1µF
100mA
V
CE/
MODE
VOUT
VOUT
VSS
MODE
VSS
ON resistance=(VIN-VLx)/100mA
Semiconductor Ltd.
Data Sheet
14
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
ꢀ TEST CIRCUITS (Continued)
Circuit 7
Circuit 8
Oscillation Check Point
ILIM
VIN
Lx
VIN
L x
1µF
1µF
ICEH
Rpulldown
1kΩ
V
V
CE/
MODE
CE/
MODE
A
VOUT
VOUT
VSS
VSS
ICEL
Circuit 9
Wave Form Measure Point
L
A
VIN
CE/
L x
Ilat
CIN
CL
1Ω
V
VOUT
MODE
VSS
1.2MHz
600kHz
4.7µF (Ceramic)
10µF (Ceramic)
4.7µF (Ceramic)
10µF (Ceramic)
CIN
CL
L
3.3µH (CDRH3D16 SUMIDA)
6.8µH (CDRH4D18C SUMIDA)
Semiconductor Ltd.
Data Sheet
15
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
! TYPICAL PERFORMANCE CHARACTERISTICS
(1) Efficiency vs. Output Current
XC9217A186
XC9217A18C
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
L=6.8uH(CDRH4D18C),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
100
100
90
80
70
90
80
70
60
VIN=5.0V
60
VIN=5.0V
VIN=3.6V
50
50
40
VIN=3.6V
40
VIN=2.7V
30
VIN=2.7V
30
20
10
0
20
PWM/PFM Automatic Switching Control
PWM Control
PWM/PFM Automatic Switching Control
PWM Control
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current:IOUT(mA)
Output Current:IOUT(mA)
XC9217A33C
XC9217A336
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
L=6.8uH(CDRH4D18C),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
100
100
90
80
70
60
90
80
70
60
50
50
40
30
20
10
0
VIN=5.0V
VIN=5.0V
VIN=4.0V
40
30
VIN=4.0V
20
PWM/PFM Automatic Switching Control
PWM Control
10
PWM/PFM Automatic Switching Control
PWM Control
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current:IOUT(mA)
Output Current:IOUT(mA)
(2) Output Voltage vs. Output Current
XC9217A18C
XC9217A186
L=6.8uH(CDRH4D18C),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
2.0
2.0
PWM/PFM Automatic
Switching Control
PWM/PFM Automatic
Switching Control
1.9
1.8
1.7
1.6
1.9
1.8
1.7
1.6
VIN=5.0V,3.6V,2.7V
VIN=5.0V,3.6V,2.7V
VIN=5.0V,3.6V,2.7V
PWM Control
PWM Control
VIN=5.0V,3.6V,2.7V
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current:IOUT(mA)
Output Current:IOUT(mA)
Semiconductor Ltd.
Data Sheet
16
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
! TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(3) Ripple Voltage vs. Output Current
XC9217A336
XC9217A33C
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
L=6.8uH(CDRH4D18C),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
3.6
3.6
3.5
3.5
PWM/PFM Automatic
PWM/PFM Automatic
VIN=5.0V,3.6V,2.7V
Switching Control
Switching Control
VIN=5.0V,3.6V,2.7V
3.4
3.3
3.4
3.3
3.2
3.1
3.0
PWM Control
3.2
PWM Control
VIN=5.0V,3.6V,2.7V
VIN=5.0V,3.6V,2.7V
3.1
3.0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current:IOUT(mA)
Output Current:IOUT(mA)
XC9217A186
XC9217A18C
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
L=6.8uH(CDRH4D18C),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
50
50
PWM/PFM Automatic
PWM/PFM Automatic
Switching Control
Switching Control
40
40
VIN=2.7V
PWM Control
VIN=2.7V
30
PWM Control
VIN=3.6V
30
20
10
0
VIN=3.6V
VIN=5.0V
VIN=5.0V
VIN=5.0V VIN=5.0V
20
VIN=3.6V,2.7V
VIN=3.6V,2.7V
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current:IOUT(mA)
Output Current:IOUT(mA)
XC9217A33C
XC9217A336
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
L=6.8uH(CDRH4D18C),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
50
50
PWM/PFM Automatic
PWM/PFM Automatic
Switching Control
40
40
30
20
10
0
Switching Control
VIN=4.0V
VIN=5.0V
PWM Control
30
20
10
0
VIN=4.0V
VIN=5.0V
PWM Control
VIN=5.0V,4.0V
VIN=5.0V,4.0V
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current:IOUT(mA)
Output Current:IOUT(mA)
Semiconductor Ltd.
Data Sheet
17
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
! TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(4) Oscillation Frequency vs. Ambient Temperature
XC9217A18C
XC9217A186
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
L=6.8uH(CDRH4D18C),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
1.5
900
1.4
VIN=3.6V
800
VIN=3.6V
1.3
1.2
1.1
1
700
600
500
400
300
0.9
0.8
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
100
100
Ambient Temperature : Ta (OC)
Ambient Temperature : Ta (OC)
(5) Supply Current vs. Ambient Temperature
XC9217A18C
XC9217A186
140
140
120
100
80
VIN=6.0V
VIN=3.6V
VIN=2.4V
120
100
80
60
40
20
0
VIN=6.0V
VIN=3.6V
VIN=2.4V
60
40
20
0
-50
-25
0
25
50
75
-50
-25
0
25
50
75
100
Ambient Temperature : Ta (OC)
Ambient Temperature : Ta (OC)
(6) Output Voltage vs. Ambient Temperature
(7) U.V.L.O. Voltage vs. Ambient Temperature
XC9217A18C
XC9217A18C
2.1
1.8
CE=VIN
VIN=3.6V
2
1.5
1.2
0.9
0.6
0.3
0
1.9
1.8
1.7
1.6
1.5
-50
-25
0
25
50
75
-50
-25
0
25
50
75
100
Ambient Temperature : Ta (OC)
Ambient Temperature : Ta (OC)
Semiconductor Ltd.
Data Sheet
18
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
! TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(8) CE "H" "L" Voltage vs. Ambient Temperature
XC9217A18C
XC9217A18C
Low Voltage
High Voltage
1
0.8
0.6
0.4
0.2
0
1
VIN=6.0V
VIN=6.0V
0.8
0.6
VIN=3.6V
VIN=2.4V
VIN=3.6V
0.4
VIN=2.4V
0.2
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ambient Temperature : Ta (OC)
Ambient Temperature : Ta (OC)
(9) Soft-start Time vs. Ambient Temperature
XC9217A18C
XC9217A186
5
5
4
3
2
1
0
VIN=3.6V
4
VIN=3.6V
3
2
1
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ambient Temperature : Ta (OC)
Ambient Temperature : Ta (OC)
(10) "P-ch/N-ch" Driver ON Resistance vs. Ambient Temperature
XC9217A18C
1
0.9
N-ch ON Resistance
0.8
0.7
0.6
0.5
0.4
P-ch ON Resistance
0.3
0.2
0.1
0
0
1
2
3
4
5
6
Input Voltage : VIN (V)
Semiconductor Ltd.
Data Sheet
19
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
! TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(11) Load Transient Response
XC9217A18C
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
VIN=3.6V, CE=VIN (PWM/PFM Automatic Switching Control)
IOUT=0.1mA ! 100mA
IOUT=0.1mA ! 300mA
1ch : IOUT
1ch : IOUT
2ch
VOUT:50mV/div
2ch
VOUT:50mV/div
20µsec/div
20µsec/div
IOUT=100mA ! 0.1mA
IOUT=300mA ! 0.1mA
1ch : IOUT
1ch : IOUT
2ch
VOUT:50mV/div
2ch
VOUT:50mV/div
200µsec/div
200µsec/div
Semiconductor Ltd.
Data Sheet
20
XC9215 / 9216 / 9217 Series
500mA Synchronous Step-Down DC/DC Converters
! TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(11) Load Transient Response (Continued)
XC9217A18C
L=3.3uH(CDRH3D16),CIN=4.7uF(ceramic),CL=10uF(ceramic),Topr=25OC
VIN=3.6V, CE=0.5 x VIN (PWM Control)
IOUT=0.1mA ! 100mA
IOUT=0.1mA ! 300mA
1ch : IOUT
1ch : IOUT
2ch
2ch
VOUT:50mV/div
VOUT:50mV/div
20µsec/div
20µsec/div
IOUT=0.1mA ! 100mA
IOUT=0.1mA ! 300mA
1ch : IOUT
1ch : IOUT
2ch
2ch
VOUT:50mV/div
VOUT:50mV/div
200µsec/div
200µsec/div
Semiconductor Ltd.
Data Sheet
21
相关型号：
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Switching Controller, Voltage-mode, 3A, 345kHz Switching Freq-Max, PDSO6, ANTIMONY AND HALOGEN FREE, ROHS COMPLIANT, USP-6
TOREX
XC9220A093MR-G
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