Preliminary
May 20, 2003 Ver. 1
!
Synchronous, Bootstrap
Nch-Nch Drive
"
APPLICATIONS
!
Input Voltage Range
: 2.5V ~ 25.0V
#
PDAs
!
Switching Frequency
: 300kHz (15%)
#
Mobile Phones
!
PWM/PFM Manual Switching Control
#
Note book computers
!
Overcurrent Protection Circuit Built-In
#
Portable Audio Systems
!
High Efficiency
: 93% (TYP.)
#
Various Multi-function Power Supplies
!
TSSOP-16 Package
!
Ceramic Capacitor Compatible
"
GENERAL DESCRIPTION
"
FEATURES
Input Voltage Range
: 2.5V ~ 25.0V
Output Voltage Range
: 1.5V ~ 15.0V externally set
Reference voltage : 1.0V (1.5%)
Oscillation Frequency
: 300kHz (15%)
Output Current
: More than 5A (V
IN
=5.0V, V
OUT
=3.3V)
Control
: PWM/PFM manual-switching control.
Current Limiter, Protection
: Current limit operates at voltage
sense 150mV.
Shutdown time can be adjusted
by CPRO.
High Efficiency
: 93% (TYP., PWM mode @ VIN=5.0V,
VOUT = 3.3V, 1A)
Detect Voltage Function
: Detects 0.9V / Open-drain output
Stand-by Current
: ISTB = 3.0
A (MAX.)
Load Capacitor
: Low ESR (ceramic, etc.)
capacitor compatible
Package
: TSSOP-16
"
TYPICAL APPLICATION CIRCUIT
"
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Transistor Built-In
Synchronous Step-Down DC/DC Controller Ics
XC9213 Series
Input Voltage : 25V
VOUT
CIN
CL
CSS
CSS
CE
M ODE
VIN
VSENSE
VL
BST
EXT1
EXT2
PGND
AGND
CBST
SD1
CFB
RFB1
RFB2
L
CVL
SD2
RSENSE
N1
N2
VIN
XC9213
FB
Lx
CPRO
CPRO
VDout
VDi n
VDout
( )
VDi n
XC9213 series is Nch-Nch drive, synchronous, step-down DC/DC
controller ICs with a built-in bootstrap driver circuit. Output will be
stable no matter which load capacitors, including a low ESR
capacitor, are used.
Resistance (RSENSE) of about 100m
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
1.5%) of internal reference voltage by using
externally connected resistors (RFB1, 2). Synchronous rectification
PWM control can be switched to non-synchronous 30mV current
limit PFM/PWM automatic switchable control (= voltage between
RSENSE pins) by using the MODE pin.
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 3.0
A or less.
XC9213B103V (FOSC:300kHz,3.0V)
0
20
40
60
80
100
0.01
0.1
1
10
Output Current IOUT (A)
Efficiency EF
F
I
(
%
)
VIN : 5.0V, Tr1,Tr2: IRF7313,
L : 6.1uH (CDRH127-6H1), Cout : 150uF (OS)
PWM
Synchronous Rectification
PWM / PFM
Non Synchronous Rectification
1
Preliminary
"
PIN CONFIGURATION
"
PIN ASSIGNMENT
"
SELECTION GUIDE
#
ORDERING INFORMATION
XC9213B
1
2
3
4
5
Reference Voltage
Fixed
Oscillation Frequency :
300kHz
Package Types :
TSSOP-16
Device Orientation : Embossed Tape, Standard Feed
Device Orientation : Embossed Tape, Reverse Feed
1
,
2
SYMBOL
DESCRIPTION
V
R
L
4
5
3
PIN NUMBER
PIN NAME
XC9213 Series
Driver Transistor Built-In
Synchronous Step-Down DC/DC Controller Ics
FUNCTION
Input Voltage : 25V
1
VIN
2
VSENSE
MODE
3
VL
4
CE
10
FB
7
Local Power Supply
Chip Enable
Analog Ground
PWM / PFM Switch
5
AGND
6
8
CSS
9
VDIN
11
VDOUT
12
PGND
16
BST
High Side Nch Driver Transistor <Connect to Gate of High Side Nch MOSFET >
Bootstrap
Input Voltage
Current Detection
15
EXT1
13
EXT2
14
LX
Low Side Nch Driver Transistor <Connect to Gate of Low Side Nch MOSFET >
Coil Connection
10
3
PART NO.
Protection Time Setting Capacitor Connection
<Set shutdown time of VOUT when detecting overcurrent>
CPRO
Soft-start Capacitor Connection <Set soft-start time>
Voltage Detector Output (Open-Drain)
Power Ground
Output Voltage Setting Resistor Connection < Set output voltage freely by split resistors >
Voltage Detector Input (0.9V)
TSSOP-16
(TOP VIEW)
1
2
8
7
6
5
4
3
16
15
9
10
11
12
13
14
2
Preliminary
"
BLOCK DIAGRAM
"
ABSOLUTE MAXIMUM RATINGS
CPRO pin voltage
CPRO
- 0.3 ~ 6.0
V
Driver Transistor Built-In
Synchronous Step-Down DC/DC Controller Ics
Input Voltage : 25V
XC9213 Series
PARAMETER
SYMBOL
RATINGS
UNITS
V
IN
pin voltage
VDOUT pin voltage
EXT2 pin voltage
V
IN
VDOUT
EXT2
- 0.3 ~ 30.0
- 0.3 ~ 30.0
- 0.3 ~ 6.0
Lx pin voltage
VSENSE pin voltage
VL pin voltage
CE pin voltage
MODE pin voltage
CSS pin voltage
VDIN pin voltage
FB pin voltage
EXT1
BST
Topr
EXT1 pin voltage
BST pin voltage
Operational Ambient Temperature
Power Dissipation
Lx
VSENSE
VL
CE
MODE
CSS
VDIN
FB
- 0.3 ~ 30.0
- 0.3 ~ 30.0
- 0.3 ~ 6.0
- 0.3 ~ 30.0
- 0.3 ~ 30.0
- 0.3 ~ 6.0
- 0.3 ~ 6.0
- 0.3 ~ 6.0
- 0.3 ~ 30.0
- 0.3 ~ 30.0
350
O
C
- 40 ~ + 85
V
V
V
V
V
V
V
V
V
V
V
V
V
Storage Temperature
Pd
mW
Tstg
O
C
- 55 ~ + 125
Buffer
Driver
Current
Limit
&
Current
Feedback
+
-
+
Ramp
Generator
PWM
Comparator
Phase
Compensation
Latch
Protection
Circuit
+
-
+
-
UVLO
UVLO Comparator
Vref with
Soft Start
Voltage
Detector
+
-
Error Amp.
Voltage Regulator
Short Protection
Circuit
Mode
Control
Logic
CE
Control
Logic
CE
CPRO
CSS
VDIN
VDOUT
FB
VL
MODE
AGND
PGND
EXT2
LX
EXT1
BST
VSENSE
VIN
Internal Blocks
3
Preliminary
"
ELECTRICAL CHARACTERISTICS
XC9213B103
(FOSC = 300kHz)
Ta=25
O
C
$
Regulator
$
Detector
Test conditions :
Unless otherwise stated, VOUT = 3.0V, VIN = 5.0V, CE = 5.0V, MODE = 5.0V
Test circuits :
Tr 1 :
2SK2857 (NEC)
CFB :
68pF
Tr 2 :
2SK2857 (NEC)
RSENSE : 0
CL :
22
F (OS-CON)
CPRO :
0F
CIN :
22
F (OS-CON)
CSS :
100pF
SD 1 :
CRS02 (Schottky barrier diode)
CVL :
1
F
RFB 1 :
200k
CBST :
0.1
F
RFB 2 :
110k
V
Output Voltage Setting Range
Input Voltage : 25V
Input Voltage
XC9213 Series
Driver Transistor Built-In
Synchronous Step-Down DC/DC Controller Ics
PARAMETER
UNIT
V
FB Control Voltage
V
V
Supply Current 1
A
UVLO Voltage
A
Stand-by Current
A
Supply Current 2
ISTB
No external components, CE=VIN, FB=1.1V
No external components, CE=FB=0V
550
kHz
Max. Duty Ratio 1
%
Oscillation Frequency
FOSC
MAXDTY1
Same as IDD1
Same as IDD1
-
95
%
PFM Duty Ratio
S
Max. Duty Ratio 2
MAXDTY2
PFMDTY
Same as IDD2
MODE=0V, IOUT=1mA, No RSENSE
-
2
mV
CPRO time
S
SENSE Voltage
VSENSE
TPRO
CPRO=100pF
-
100
S
Efficiency
%
Soft-Start Time
TSS
EFFI
CSS=100pF, VOUT x 0.95, CE=0V
!
3V
IOUT=1A
-
93
V
CE "L" Voltage
V
CE "H" Voltage
VCEH
VCEL
No external components,
FB=0V, Voltage which EXT pin starts oscillation
No external components,
FB=0V, Voltage which EXT pin voltage holding "L" level
-
V
MODE "L" Voltage
V
MODE "H" Voltage
VPWMH
VPWML
No load
No load
-
-
EXT1 "L" ON Resistance
EXT1 "H" Resistance
REXT1H
REXT1L
FB=0.9V, EXT1=3.6V
FB=1.1V, EXT2=0.4V
-
10
EXT2 "L" ON Resistance
EXT2 "H" ON Resistance
REXT2H
REXT2L
FB=1.1V, EXT1=3.6V
FB=0.9V, EXT2=0.4V
-
3
A
CE "L" Current
A
CE "H" Current
ICEH
ICEL
CE=5.0V
CE=0V
-
-
A
MODE "L" Current
A
MODE "H" Current
IMODEH
MODE=5.0V
MODE=0V
IMODEL
-
-
A
CSS "L" Current
A
CSS "H" Current
CSS=3.8V
CSS=0V
ICSSH
ICSSL
-
-2.0
A
FB "L" Current
A
FB "H" Current
IFBL
IFBH
FB=5.0V
FB=1.1V
-
-
V
Load Stability
mV
Output Voltage
-
4.0
-
IVDOUTH
VDOUT=0.5V
IVDINL
VDIN=5.0V
VDIN=0V
VDOUT=5.0V
Detect Voltage
V
VDIOUT
IVDINH
VDIN "H" Current
A
Delay Time
%
VD Input Current
mV
Hysteresis Range
A
PARAMETER
UNIT
VDOUT " L" Current
IVDOUTL
A
VDOUT " H" Current
A
VDIN "L" Current
mS
UNIT
Input Stability
"
VOUT
"
VIN x VOUT
SYMBOL
PARAMETER
VOUTVL + 1.0V
VIN
25.0V
CONDITIONS
VDR
!
VOUT inversion
Voltage which EXT1 pin starts oscillation
No external components, CE=VIN, FB=0.9V
MAX.
TYP.
MIN.
-
1.5
-
-
SYMBOL
VIN
VOUTSET
CONDITIONS
VFB
UVLO
IDD1
IDD2
SYMBOL
VLOUT
"
VOUT
tDLY
VDF
VHYS
CONDITIONS
IOUT=10mA
1mA
IOUT
30mA
IOUT=10mA
VDOUT=0V
2.5
-
25.0
1.5
-
15.0
-
1.0
-
-
-
450
-
-
-
3.0
255
300
345
-
-
98
-
-
-
150
-
-
-
300
-
-
1.4
-
-
0.5
1.4
-
-
0.5
-
18
-
-
-
18
-
-
-
-
0.1
-0.1
-
-
0.1
-0.1
-
-0.7
-
-
-
-
0.1
-0.1
MIN.
TYP.
MAX.
%/V
-
100
-
MIN.
TYP.
MAX.
-
0.9
-
-
6
-
-
15
-
-
-0.1
-
-
0.1
-
-
0.1
-
-
-0.1
0.2
-
-
-
-
-0.1
-
4
Preliminary
"
EXTERNAL COMPONENTS
<Setting of Output Voltage>
VOUT = RFB1 / RFB2 + 1
[ Example of Equation ]
VOUT = 3.0V
RFB1 = 200k
, RFB2 = 110k
, CFB = 68pF
VOUT = 220k / 110k + 1 =3.0V
fzfb = 1 / (2 x
x 68p x 220k ) = 10.64kHz
<External Components>
Tr 1, Tr 2
$
IOUT = 2 ~ 3A
IRF7313 (Nch x 2) (IR, SO-8)
$
IOUT
= ~10A
SUP70N03-09
(Vishay, TO-220AB)
SUB70N03-09
(Vishay, TO-263)
L:
6.8
F
(CDH127-6H1, SUMIDA)
SD 1 :
CMS02
(Schottky barrier diode, TOSHIBA)
SD 2 :
CRS02
(Schottky barrier diode, TOSHIBA)
* Please select SD2 with low reverse current.
RSENSE : Current Limit Value = 150mV / RSENSE
ex.) When RSENSE = 30m
,
Current Limit = 150mV / 30m
= about 5A
CPRO :
TPRO = CPRO x 1e6
ex.) When CPRO = 100pF
TPRO = 100e -12 x 1e6 =100
S
CSS=
TSS = CSS x 3e6
ex.)When CSS = 3300pF,
TPRO = 3300e - 12 x 3e6 = 9.9mS
CBST :
0.1
F ~ 1
F
* Please adjust according to
reverse current characteristics of SD2.
CVL :
1
F
CIN :
22
F
(OS-CON, SANYO)
CL :
150
F
(OS-CON, SANYO)
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on the
values of RFB1 and RFB2. The sum of RFB1 and RFB2 should normally be 2 M
or less.
The value of CFB1, speed-up capacitor for phase compensation, should be fzfb= 1 / (2
CFB
RFB1) which is equal to 10kHz.
Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and value of load capacity
(CL).
XC9213 Series
Driver Transistor Built-In
Synchronous Step-Down DC/DC Controller Ics
Input Voltage : 25V
5
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