XC9213 Series
ETR0505_002a
Synchronous Step-Down DC/DC Controller IC - Input Voltage : 25V
■GENERAL DESCRIPTION
The XC9213 series is N-ch & N-ch drive, synchronous, step-down DC/DC controller IC with a built-in bootstrap driver circuit.
Output will be stable no matter which load capacitors, including low ESR capacitors, are used.
Resistance (RSENSE) of about several 10mΩ will be required as a current sense. The phase compensation is also run when
a low ESR capacitor is used. In addition, the circuit is double protected by the ways of limiting the current while detecting
overshoot current and making output shutdown at any given timing by a protection time setting capacitor (CPRO).
The output voltage can be set freely within a range of 1.5V~15.0V with 1.0V (accuracy±2%) of internal reference voltage by
using externally connected resistors (R
current limit PFM/PWM automatic switchable control (=voltage between R
The series has a built-in voltage detector for monitoring a selected voltage by external resistors.
During stand-by (CE pin = low) all circuits are shutdown to reduce current consumption to as low as 4.0μA or less.
■APPLICATIONS
●PDAs
●Mobile phones
●Note book computers
●Portable audio systems
●Various multi-function power supplies
■TYPICAL APPLICATION CIRCUIT
SD2
FB1, 2). Synchronous rectification PWM control can be switched to non-synchronous
SENSE pins) by using the MODE pin.
■FEATURES
Input Voltage Range : 4.0V ~ 25.0V
Output Voltage Range : 1.5V ~ 15.0V externally set
Reference voltage : 1.0V (±2%)
Oscillation Frequency : 300kHz (±15%)
Output Current : 5A (VIN=5.0V, VOUT=3.3V)
Control : PWM/PFM manual control
Current Limit Protection : Sense Voltage=170mV
High Efficiency : 93% (VIN=5.0V,VOUT=3.3V, IOUT=1A]
Detect Voltage Function : Detects 0.9V/Open-drain output
Stand-by Current : ISTB = 4.0μA (MAX.)
Load Capacitor
Shutdown Time
Built-in Bootsrap
Package : TSSOP-16
Environmentally friendly : EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
CHARACTERISTICS
☆GreenOperation Compatible
: Low ESR capacitor
: Adjustable by CPRO pin
: External Nch-Nch Drivers
VIN
CIN
CVL
VDIN
VDOUT
CSS
VIN VSENSE
VDIN
VDOUT
VL
CSS
CPRO
AGND
CPRO
RSENSE
XC9213
BST
EXT1
LX
FB
EXT2
PGND
CEMODE
CBST
Tr1
L
SD1
CFB
Tr2
VOUT
RFB1
CL
RFB2
1/34
XC9213 Series
■PIN CONFIGURATION
■PIN ASSIGNMENT
PIN NUMBER PIN NAME FUNCTION
1
2
3
4
5
6
V
IN
SENSE
V
V
CE
AGND
MODE
7 CPRO
8
9
10
11
12
13
14
15
16
■CE PIN & MODE PIN FUNCTION
CSS
VDIN
FB
VDOUT
PGND
EXT2
LX
EXT1
BST
CE PIN OPERATIONAL STATE
H
L Shut down
Input Voltage
Current Detection
Local Power Supply
L
Chip Enable
Analog Ground
PWM / Current Limit PFM Switch
Protection Time Setting Capacitor Connection
<Set shutdown time of VOUT when detecting overcurrent>
Soft-start Capacitor Connection <Set soft-start time>
Voltage Detector Input (0.9V)
Output Voltage Setting Resistor Connection < Set output voltage freely by split resistors >
Voltage Detector Output (Open-Drain)
Power Ground
Low Side N-ch Driver Transistor <Connect to Gate of Low Side N-ch MOSFET >
Coil Connection
High Side N-ch Driver Transistor <Connect to Gate of High Side N-ch MOSFET >
Bootstrap
Operation
MODE PIN OPERATIONAL STATE
H
L
■PRODUCT CLASSIFICATION
●Ordering Information
XC9213B①②③④⑤-⑥
PWM / Current Limit PFM Automatic Switching Control
(*1)
Synchronous
PWM Control
Non-Synchronous
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
①②
③
④⑤-⑥
(*1)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
Reference Voltage 10 1.0V (Fixed)
Oscillation Frequency 3
Package
(Oder Unit)
VR
VR-G
TSSOP-16 (TOP VIEW)
300kHz
TSSOP-16 (3,000/Reel)
TSSOP-16 (3,000/Reel)
2/34
■ABSOLUTE MAXIMUM RATINGS
PAR AMETER SYMBOL RATINGS UNITS
VIN Pin Voltage VIN - 0.3 ~ 30.0 V
VSENSE Pin Voltage VSENSE - 0.3 ~ 30.0 V
VL Pin Voltage VL - 0.3 ~ 6.0 V
CE Pin Voltage (*) CE - 0.3 ~ 30.0 V
MODE Pin Voltage (*) MODE - 0.3 ~ 30.0 V
CPRO Pin Voltage CPRO - 0.3 ~ 6.0 V
CSS Pin Voltage CSS - 0.3 ~ 6.0 V
VDIN Pin Voltage VDIN - 0.3 ~ 6.0 V
FB Pin Voltage FB - 0.3 ~ 6.0 V
VDOUT Pin Voltage VDOUT - 0.3 ~ 30.0 V
EXT2 Pin Voltage EXT2 - 0.3 ~ 6.0 V
Lx Pin Voltage Lx - 0.3 ~ 30.0 V
EXT1 Pin Voltage EXT1 - 0.3 ~ 30.0 V
BST Pin Voltage BST - 0.3 ~ 30.0 V
EXT1 Pin Current IEXT1
EXT2 Pin Current IEXT2
Lx Pin Current ILx 100 mA
Power Dissipation Pd 350 mW
Operational Temperature Range Topr - 40 ~ + 85
Storage Temperature Range Tstg - 55 ~ + 125
(*) CE, MODE pin voltage
1) 1.4V≦High Level≦6V
The CE pin and the MODE pin can be connected directly
2) 6V < High Level < 30V
The CE pin and the MODE pin should be connected to
to the high level power supply.
±100
±100
over 1kΩ resistor when connecting
mA
mA
O
C
O
C
XC9213
Series
IC Inside
CE or
MODE
1.4V<High Level<6V 6V< Hig h Le vel<30V
IC Inside
R>1kΩ
CE or
MODE
3/34
XC9213 Series
■ELECTRICAL CHARACTERISTICS
XC9213B103 (FOSC = 300kHz) Ta =2 5OC
PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT
Input Voltage (*2) VIN 4.0 - 25.0 V -
Output Voltage
Setting Range
FB Control Voltage VFB 0.980 1.000 1.020 V 1
U.V.L.O. Voltage UVLO Voltage which EXT1 pin starts oscillation 1.0 1.5 2.0 V 2
Supply Current 1 IDD1 CE=VIN, FB=0.9V - 550 800 μA 3
Supply Current 2 IDD2 CE=VIN, FB=1.1V - 450 600 μA 3
Stand-by Current ISTB CE=FB=0V - - 4.0 μA 4
Oscillation Frequency FOSC CE=VIN, FB=0.9V 255 300 345 kHz 5
Maximum Duty Ratio 1 MAXDTY1 CE=VIN, FB=0.9V 91 95 - % 5
Maximum Duty Ratio 2 MAXDTY2 CE=VIN, FB=1.1V - 98 - % 5
PFM Duty Ratio PFMDTY
Sense Voltage VSENSE Voltage which EXT1 pin stops oscillation 145 170 200 mV 7
CPRO time TPRO
Soft-Start Time TSS
Short Protection Circuit
Operating Voltage
Efficiency EFFI
CE "H" Voltage VCEH Voltage which EXT1 pin starts oscillation 1.4 - - V 11
CE "L" Voltage VCEL
MODE "H" Voltage VMODEH Voltage which EXT2 pin starts oscillation 1.4 - - V 12
MODE "L" Voltage VMODEL
EXT1 "H"
ON Resistance
EXT1 "L"
ON Resistance
EXT2 "H"
ON Resistance
EXT2 "L"
ON Resistance
Dead Time 1 TDT1
Dead Time 2 TDT2
CE "H" Current ICEH CE=5.0V - - 0.1 μA 17
CE "L" Current ICEL CE=0V -0.1 - - μA 17
MODE "H" Current IMODEH MODE=5.0V - - 0.1 μA 18
MODE "L" Current IMODEL MODE=0V -0.1 - - μA 18
CSS Current ICSS CSS=0V -4.0 -2.0 - μA 19
FB "H" Current IFBH FB=5.0V - - 0.1 μA 20
FB "L" Current IFBL FB=0V -0.1 - - μA 20
V
OUTSET 1.5 - 15.0 V -
With external components,
VOUT=3V, MODE=0V, IOUT=1mA,
No R
SENSE
CPRO=4700pF, V
Time until V
SENSE=0V0.5V,
DOUT inverts H to L
2.5 3.0 3.9 μs 6
2.3 4.7 9.4 ms 8
With external components,
CSS=4700pF, CE=0V3V,
V
SHORT
Time until voltage becomes V
V
IN-VSENSE: 0.3V fixed, FB: SWEEP.
Voltage which V
DOUT inverts H to L
With external components, I
V
OUT=3.0V
OUT x 0.95
OUT=1A,
Voltage which EXT1 pin voltage holding
"L" level
Voltage which EXT2 pin voltage holding
"L" level
R
EXT1H FB=0.9V, EXT1=3.6V - 18 23 Ω 13
R
EXT1L FB=1.1V, EXT1=0.4V - 11 18 Ω 14
R
EXT2H FB=1.1V, EXT1=3.6V - 18 23 Ω 15
R
EXT2L FB=0.9V, EXT2=0.4V - 4 8 Ω 16
With external components,
EXT1: HL, EXT2: LH
With external components,
EXT2: HL, EXT1: LH
4 8 21 ms 9
0.15 0.40 0.72 V 25
- 93 - % 10
- - 0.4 V 11
- - 0.4 V 12
- 100 - ns 10
- 60 - ns 10
4/34
XC9213
■ELECTRICAL CHARACTERISTICS (Continued)
XC9213B103 (Continued)
●Voltage Regulator (*3)
PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX.
Output Voltage VLOUT FB=1.1V, ILOUT=10mA 3.86 4.00 4.14 V 21
Load Regulation VLOUT
Input Regulation
●Voltage Detector
VLOUT
VIN・VLOUT
FB=1.1V, 1mA≦I
LOUT≦30mA
FB=1.1V, ILOUT=10mA,
VLOUT+1V≦VIN≦25V
- 45 90 mV 21
- 0.05 0.1 %/V 21
PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX.
Detect Voltage VDF
Release Voltage (*4) VDR
FB=1.1V,
Voltage which V
FB=1.1V,
Voltage which V
DOUT inverters H to L
DOUT inverters L to H
0.855 0.900 0.925 V 22
0.915 0.954 0.980 V 22
Hysteresis Range HYS FB=1.1V 2.9 6.0 7.5 % 22
Output Current VDIOUT FB=1.1V, VDIN=VDF-0.4V, VDOUT=0.5V
Delay Time TDLY
DR→VDOUT inversion
V
VDIN Current IVDIN VDIN=5.0V
NOTE:
*1: Unless otherwise stated, V
*2: The operation may not be stable at no load, if the step-down ratio (V
*3: The regulator block is used only for bootstrap. Please do not use as a local power supply.
*4: Release voltage: (VDR) = VDF + HYS x VDF
IN=5.0V, CE=5.0V, MODE=5.0V, FB=0.9V
OUT/VIN x 100) becomes lower than 12%.
5 15 20 mA 23
- - 10 μs 22
- - 0.1 μA 24
UNITS
UNITS
Series
CIRCUIT
CIRCUIT
5/34
XC9213 Series
■TEST CIRCUITS
Circuit 1 Circuit 2
OCS
OCS
Circuit 3 Circuit 4
Circuit 5 Circuit 6
VIN
VSE NSE
VL
10uF 1uF
+
-
+-+
-
Circuit 7
CE
AGND
MODE
CPRO
CSS
100p F
BST
EXT1
EXT2
PGND
VDOUT
VDIN
OCS
OCS
LX
OCS
OCS
FB
100k
100k
+
-
Tr1: 2SK2857 (NEC)
+
-
10uF 1uF
VIN
+
VSENSE
VL
CE
AGND
+-+
-
100pF
MODE
CPRO
CSS VDIN
100pF
BST
EXT1
EXT2
PGND
VDOUT
OSC
OSC
100k
100k
LX
SBD1: CRS02 (TOSHIBA)
L: 22μH CDRH6D28 (SUMIDA)
CL: 100μF (OS-CON, NIPPON CHEMI-CON)
C
Tr2: 2SK2857 (NEC)
FB
+
-
IN1: 22μF (OS-CON, SANYO)
RFB1: 220kΩ
R
FB2: 110kΩ
C
FB: 68pF
SBD1
VIN
VSENSE
VL
CE
1uF
+
+
-
+
-
100pF
AGND
MODE
CPRO
CSS
VDOUT
BST
EXT1
EXT2
PGND
VDIN
OSC
OSC
CIN
1uF
Tr1
LX
FB
L
Tr2
RFB1
CFB
CL
RFB2
6/34
■TEST CIRCUITS (Continued)
Circuit 8 Circuit 9
VIN
+
VSENSE
VL
1uF10uF
+
-
+-+
-
4700pF
CE
AGND
MODE
CPR
CSS
100pF
BST
EXT1
EXT2
PGND
VDOUT
VDIN
OSC
OSC
LX
FB
100k 100k
+
-
ceramic
1uF
XB01SB04A2BR (TOREX)
VIN
VSE NSE
VL
CE
AGND
MODE
CPRO
CSS
ceramic
4700pF
BST
EXT1
EXT2
PGND
VDOUT
VDIN
XC9213
Series
VIN
RSENSE: 33 m
ceramic
10uF+10uF
ceramic
1uF
LX
CMS02
(TOSHI BA)
VIN
100k
FB
100k
VL
IRF7313
ceramic
47pF
200k
100k
(IR)
7.4uH(SUMIDA)
25PS100JM12 100uF
GND
VOUT
(NIPPON CHE MI-CON)
Circuit 10 Circuit 11
VIN
XB01SB04A2BR(TOREX)
VIN
VSENSE
VL
ceramic
1uF
ceramic
4700pF
Circuit 12 Circuit 13
+
-
CE
AGND
MODE
CPRO
CSS
ceramic
4700pF
1uF10uF
+
-
100pF
BST
ceramic
EXT1
EXT2
PGND
VDOUT
VDIN
VIN
VSENSE
VL
CE
AGND
MODE
CPRO
CSS V DIN
1uF
LX
CMS02
(TOSHIBA)
100k
FB
100k
VIN
VL
BST
EXT1
LX
EXT2
PGND
VDOUT
FB
ceramic
10uF+10uF
RSENSE: 33 m
IRF7313
(IR)
7.4uH(SUMIDA )
ceramic
47pF
200k
100k
100k 100k
OSC
O
SC
+
-
+
-
25PS 100 JM12 100u F
(NIPPO N CHEMI-CO N)
GND
+
-
VIN
VSE NSE
VL
CE
1uF10u F
+
-
100pF
1uF10uF
+
-
AGND
MODE
CPRO
CSS VDIN
VIN
VSENSE
VL
CE
AGND
MODE
CPRO
CSS VDIN
100pF
BST
EXT1
EXT2
PGND
VDOUT
EXT1
EXT2
PGND
VDOUT
BST
LX
FB
LX
FB
OSC
OSC
100k 100k
+
-
OSC
OSC
50k
+
+
-
-
10uF
7/34
XC9213 Series
■TEST CIRCUITS (Continued)
Circuit 14 Circuit 15
BST
EXT1
EXT2
PGND
VDOUT
VDIN
LX
FB
EXT1
EXT2
PGND
VDOUT
VDIN
BST
LX
+
FB
+
-
V
+
-
V
-
+
-
VIN
VSENSE
VL
1uF10uF
+
-
+
-
Circuit 16 Circuit 17
1uF10uF
+
-
+
-
100pF
CE
AGND
MODE
CPRO
CSS
100pF
VIN
VSENSE
VL
CE
AGND
MODE
CPRO
CSS
VIN
VSENSE
VL
CE
1uF10uF
+
-
1uF10uF
A
+
-
100pF
AGND
MODE
CPRO
CSS VDIN
100pF
VIN
VSENSE
VL
CE
AGND
MODE
CPRO
CSS VDIN
BST
EXT1
EXT2
PGND
VDOUT
PGND
VDOUT
LX
FB
EXT1
EXT2
BST
OSC
OSC
50
10uF
+
+
-
-
LX
FB
100k100k
Circuit 18 Circuit 19
VIN
VSENSE
VL
CE
1uF10uF
+
-
A
+
100pF
AGND
MODE
CPRO
CSS
EXT1
EXT2
PGND
VDOUT
VDIN
BST
LX
FB
100k100k
+
-
8/34
VIN
VSENSE
VL
CE
1uF10uF
+-+
-
AGND
MODE
CPRO
CSS VDIN
A
BST
EXT1
EXT2
PGND
VDOUT
LX
FB
100k100k
■TEST CIRCUITS (Continued)
Circuit 20 Circuit 21
XC9213
Series
VIN
VSENSE
VL
1uF10uF
+
-
100pF
Circuit 22 Circuit 23
1uF10uF
+
-
+
-
CE
AGND
MODE
CPRO
CSS VDIN
VIN
VSENSE
VL
CE
AGND
MODE
CPRO
CSS VDIN
100pF
BST
EXT1
EXT2
PGND
VDOUT
LX
FB
BST
EXT1
EXT2
PGND
VDOUT
100k100k
+
-
A
+
-
100k
LX
+
-
FB
V
+
+
-
-
EXT1
EXT2
PGND
VDOUT
VDIN
BST
LX
FB
BST
EXT1
EXT2
PGND
VDOUT
LX
FB
+
-
100k100k
+
-
A
+
+
-
-
VIN
VSENSE
VL
IL
1uF10uF
↓
1uF10uF
V
+-+
-
100pF
+
-
100pF
CE
AGND
MODE
CPRO
CSS VDIN
VIN
VSENSE
VL
CE
AGND
MODE
CPRO
CSS
Circuit 24 Circuit 25
VIN
VSENS E
VL
CE
1uF10uF
+
-
AGND
MODE
CPRO
CSS VDIN
100pF
EXT1
EXT2
PGND
VDOUT
BST
LX
FB
100k
A
+
-
+
-
VIN
+
-
VSENSE
VL
CE
1uF10uF
+-+
-
AGND
MODE
CPRO
CSS VDIN
100pF
BST
EXT1
EXT2
PGND
VDOUT
OSC
OSC
LX
FB
100k100k
+
-
9/34
XC9213 Series
■BLOCK DIAGRAM
■OPERATIONAL EXPLANATION
< Error Amplifier >
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback
voltage. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increases.
<Ramp Wave Generator>
The Ramp Wave Generator is organized by the circuits generates a saw-tooth waveform based on the oscillator circuit which
sets an oscillation frequency and a signal from the oscillator circuit.
< PWM Comparator >
The PWM Comparator compares outputs from the error amp. and saw-tooth waveform. When the voltage from the error
amp's output voltage is low, the external switch will be set to OFF.
< U.V.L.O. Comparator >
When the V
< Voltage Regulator >
The voltage regulator block generates 4.0V voltage for the bootstrap circuit. The regulator block is also the power supply for
the internal circuit. Please do not use the regulator block as a local power supply.
<Vref with Soft Start>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming. The soft-start circuit protects
against inrush current, when the power is switched on, and also to protect against voltage overshoot. It should be noted,
however, that this circuit does not protect the load capacitor (C
depending upon the input to the error amps, the operation maintains a balance between the two inputs of the error amps and
controls the EXT1 pin's ON time so that it doesn't increase more than is necessary.
<CE Control Logic >
This function controls the operation and shutdown of the IC. When the voltage of the CE pin is 0.4V or less, the mode will
be chip disable, the channel's operations will stop. The EXT1/2 pins will be kept at a low level (the external N-ch MOSFET
will be OFF). When the CE pin is in a state of chip disable, current consumption will be no more than 4.0μA. When the
CE pin's voltage is 1.4V or more, the mode will be chip enable and operations will recommence. With soft-start, 95% of the
set output voltage will be reached within 8mS (C
< Voltage Detector >
The voltage detector of the XC9213 series is FB type. The reference voltage is 0.9V (TYP.) and the detect voltage can be
set by external resistors. The output is N-ch Open Drain type. The detector is switched on / off with DC/DC by the CE pin.
IN pin voltage is lower than 1.5V (TYP.), the circuit sets EXT/2 to "L" and the external transistor is forced OFF.
L) from inrush current. With the Vref voltage limited and
SS: 4700pF (TYP.)) from the moment of chip enable.
10/34
XC9213
■OPERATIONAL EXPLANATION (Continued)
< Protection Circuit Operation (Current Limit, Latch Protection Circuit, and Short Protection Circuit) >
Shown above is a timing chart for protection circuit operations. When the output current changes from normal to an
overcurrent condition, the current-limiting circuit detects the overcurrent condition as a voltage drop occurring, by virtue of the
current-sensing resistor, at the VSENSE pin. Upon detection, the current-limiting circuit limits the peak current passed
through the high-side N-ch MOSFET at every clock pulse (state ①). It is possible to regulate the value of limited current by
varying the resistance value of the current-sensing resistor. A protection circuit (protective latch circuit), which is designed
to stop the clock, functions if the overcurrent condition continues for a predetermined time (state ②). Time delay before the
protective latch circuit functions is adjustable by the capacitance connected to the CPRO pin (typically 4.7 ms if CPRO has
4,700 pF). The protective latch circuit is reset by turning off and on, or by a disable action followed by an enable action
using the CE pin. If, furthermore, the output is short-circuited (state ③) and V
short-circuit protection circuit detects the condition by means of the FB pin and stops the clock with no time delay. The
short-circuit protection circuit is reset by turning off and on or by a disable action followed by an enable action using the CE
pin, as with the protective latch circuit.
< Mode Control Logic >
A timing chart for automatic switching of current-limiting PFM/PWM is shown above. High-level of the MODE pin allows
PWM operations to occur for synchronous rectification (state ①). When the MODE pin shifts to low-level, current-limiting
PFM/PWM automatic switching occurs with synchronous rectification stopped. Consequently, the low-side N-ch MOSFET
is constantly off under this condition. In addition, a comparison is made for the purposes of automatic switching, between
the ON time of the high-side N-ch MOSFET determined by the internal error amp. and the time required for the current
passed at every clock pulse through the high-side N-ch MOSFET to reach a preset amount of current. The longer one is
selected and becomes on duty (state ② or ③). If the time determined by the error amp. is longer than the other, PWM
operation occurs. Current-limiting PFM operation occurs if the time taken by the current passing at every clock pulse to
reach a preset amount of current is longer. Thus the automatic switching mechanism achieves high efficiency under light to
heavy load conditions.
OUT decreases to a value close to 0 V, the
Series
11/34
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