TOREX XC9303 User Manual

XC9303 Series

ETR0602_004

High Efficiency, Synchronous Step-Up & Down DC / DC Controller ICs

■GENERAL DESCRIPTION

The XC9303 series is highly efficient, synchronous PWM, PWM/PFM switchable step-up & down DC/DC controller ICs.
A versatile, large output current and high efficiency, step-up/down DC/DC controller can be realized using only basic
external components - transistors, coil, diode, capacitors, and resistors for detecting voltages. High efficiency is obtained
through the use of a synchronous rectification topology. The operation of the XC9303 series can be switched between PWM
and PWM/PFM (auto switching) externally using the PWM pin. In PWM/PFM mode, the XC9303 automatically switches
from PWM to PFM during light loads and high efficiencies can be achieved over a wide range of output loads conditions.
Output noise can be easily reduced with PWM control since the frequency is fixed. Synchronous rectification control can be
switched to non-synchronous by using external signals (MODE pin). High efficiency can be regulated at heavy loads when
synchronous operation. The XC9303 has a 0.9V (±2.0%) internal voltage supply and using externally connected
components, output voltage can be set freely between 2.0V to 6.0V. With an internal 300kHz switching frequency smaller
external components can be used. Soft-start time is internally set to 10ms and offers protection against in-rush currents
when the power is switched on and prevents voltage overshoot.

■APPLICATIONS

●PDAs

●Palmtop computers

●Portable audios

●Various power supplies

■FEATURES

Input Voltage Range : 2.0V ~ 10V
Output Voltage Range : 2.0V ~ 6.0V

(set freely with VFB=0.9V)

Oscillation Frequency : 300kHz (±15%)
Output Current : 800mA(V
Stand-By Function : 3.0μA (MAX.)
Maximum Duty Cycle : 78% (TYP.)
High Efficiency : 84% (TYP.)
Soft-Start Time : 10ms (internally fixed)
Package : MSOP-8A

Environmentally Friendly: EU RoHS Compliant, Pb Free

■TYPICAL APPLICATION CIRCUIT

■TYPICAL PERFORMANCE

CHARACTERISTICS

●Efficiency vs. Output Current

<XC9303B093K OUTPUT= 3.3V>

Tr 1:Pch M OSF ET

:CPH 6315

PWM

CE

V IN :2.0V~10V

Tr 2:Nc h M OSFE T

:CPH 3409

CIN :47uF

EXT1

VDD

PWM

CE

EXT2

GND

CDRH127/LD

FB

NC

L:22uH

Tr 3:Nc h MO SFE T

:CPH 3409

SD:C MS02

CFB

:62pF

RFB

:200 kΩ

RFB

:75 kΩ

VOUT :3.3V

CL:

47uFX2

XC9303B093K (300kH z , V

L=2 2uH( CDRH127/LD), CL=94uF(Tantalum),SD:CMS02

100

PWM/PFM Switching Control

90

80

70

60

50

40

30

Efficiency EFFI (%)

20

10

0

0.1 1 10 100 1000 10000

☆Green Operation Compatible

IN = 4.2V, VOUT=3.3V)

=3.3V)

OUT

Tr1:CPH6315, Tr2:CPH3409, Tr3:CPH3409

VIN=2.7V

Output Current I

PW M Cont rol

OUT

4.2V

(mA )

1/20

XC9303 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

PIN NUMBER PIN NAME FUNCTIONS

■PRODUCT CLASSIFICATION

●Ordering Information

(*1)

1 EXT 1 / External Transistor Drive Pin <Connected to High Side of P-ch Power MOSFET Gate>

2 VDD Supply Voltage

3 PWM

4 CE

5 NC No Connection

6 FB

7 GND Ground

8 EXT2 External Transistor Drive Pin <Connected to Low side of N-ch Power MOSFET Gate>

XC9303①②③④⑤⑥-⑦

DESIGNATOR ITEM SYMBOL DESCRIPTION

① Type of DC/DC Controller B Standard type

②③ Output Voltage 09 FB Voltage: 0.9V

④ Oscillation Frequency 3 300kHz

⑤⑥-⑦

The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.

(*１)

1 EXT1

2 VDD

3 PWM FB 6

4 CE NC 5

EXT2 8

GND 7

MSOP-8A

(TOP VIEW)

PWM/PFM Switching Pin <PWM control when connected to V
switching when connected to Ground. >

Chip Enable Pin <Connected to Ground when output is stand-by mode. Connected to

DD when output is active. EXT/1 is high and EXT2/ is high when in stand-by mode. >

V

Output Voltage Monitor Feedback Pin <Threshold value: 0.9V. Output voltage can be set
freely by connecting split resistors between V

(*1)

Packages (Order Unit)

OUT and Ground. >

KR MSOP-8A (1,000/Reel)

KR-G MSOP-8A (1,000/Reel)

DD, PWM / PFM auto

2/20

■ BLOCK DIAGRAM

EX T1 /

■ ABSOLUTE MAXIMUM RATINGS

FB

Vref=0.9V

CE

with Soft-Start,

CE

PAR AMETER SYMBOL RATINGS UNITS

VDD Pin Voltage VDD - 0.3 ~ 12.0 V

FB Pin Voltage VFB - 0.3 ~ 12.0 V

CE Pin Voltage VEN - 0.3 ~ 12.0 V

PWM Pin Voltage VPWM - 0.3 ~ 12.0 V

Erro r Am p

+

-

CE to

inte rnal ci rcu it

EXT1, 2 Pin Voltage VEXT - 0.3 ~ VDD + 0.3 V

EXT1, 2 Pin Current IEXT ±100 mA

Power Dissipation Pd 150 mW

Operating Temperature Range Topr - 40 ~ + 85

Storage Temperature Range Tstg - 55 ~ +125

Synchronous

Blank Logic

PWM

Comparator

+

-

RampWave

Ge ne rator,

OSC

PWM/PFM

Control ler

XC9303

Series

EX T2

PWM

VIN

GND

Ta = 2 5 ℃

℃

℃

3/20

(

(

)

p

XC9303 Series

■ ELECTRICAL CHARACTERISTICS

XC9303B093

PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

Supply Voltage VDD 2.0 - 10.0 V

Maximum Input Voltage VIN 10.0 - - V

Output Voltage Range (*1) VOUTSET

IN≧2.0V, IOUT=1mA

V

V

OUT 2.0 - 6.0 V

Supply Current 1 IDD1 FB = 0V - 90 170

Supply Current 2 IDD2 FB = 1.0V - 55 110

Stand-by Current ISTB Same as IDD1, CE = 0V - - 3.0

Oscillation Frequency FOSC Same as IDD1 255 300 345 kHz

FB Voltage VFB VIN=3.0V, IOUT=10mA 0.882 0.900 0.918 V

Minimum Operation Voltage VINmin - - 2.0 V

Maximum Duty Ratio MAXDTY Same as IDD1 72 78 88 %

Minimum Duty Ratio MINDTY Same as IDD2 - - 0 %

PFM Duty Ratio PFMDTY No Load, VPWM=0V 22 30 38 %

Efficiency (*2) EFFI IOUT1=100mA (*3) - 84 - %

Soft-Start Time TSS

OUT×0.95V, CE=0V→0.65V

V

EXT1 "High" ON Resistance REXTBH1 CE = 0, EXT1= VDD - 0.4V - 26 37

EXT1 "Low" ON Resistance REXTBL1 FB = 0V, EXT1 = 0.4V - 19 30

EXT2 "High" ON Resistance REXTBH2 EXT2 = VDD - 0.4V - 23 31

EXT2 "Low" ON Resistance REXTBL2 CE = 0V, EXT2 = VDD - 0.4V - 19 30

PWM "High" Voltage VPWMH No Load 0.65 - - V

PWM "Low" Voltage VPWML No Load - - 0.20 V

CE "High" Voltage VCEH FB = 0V 0.65 - - V

CE "Low" Voltage VCEL FB = 0V - - 0.2 V

CE "High" Current ICEH - - 0.5

CE "Low" Current ICEL CE = 0V - - - 0.5

PWM "High" Current IPWMH - - 0.5

PWM "Low" Current IPWML PWM=0V - - - 0.5

FB "High" Current IFBH - - 0.50

FB "Low" Current IFBL FB = 1.0V - - - 0.50

NOTE *1: Please be careful not to exceed the breakdown voltage level of the external components.
*2: EFFI={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100
*3: Tr1: CPH6315 (SANYO)

Tr2: CPH3409 (SANYO)

Tr3: CPH3409 (SANYO)
SD: CMS02 (TOSHIBA)

L: 22μH (CDRH127/LD, SUMIDA)
C
C

RFB1: 200kΩ
R
C

L: 16V, 47μF x 2 (Tantalum MCE Series, NICHICEMI)
IN: 16V, 47μF

FB2: 75kΩ
FB: 62

F

Tantalum MCE Series, NICHICEMI

FOSC = 300kHz) Ta =2 5 ℃

μA ②

μA ②

μA ②

5.0 10.0 20.0 ms

Ω ⑤

Ω ⑤

Ω ⑤

Ω ⑤

μA ②

μA ②

μA ②

μA ②

μA ②

μA ②

CIRCUIT

①

①

①

②

③

①

②

②

④

④

④

④

④

②

②

4/20

XC9303

Series

■ OPERATIONAL EXPLANATION

The XC9303 series are synchronous step-up & down DC/DC converter controller ICs with built-in high speed, low ON
resistance drivers.

<Error Amp.>
The error amplifier is designed to monitor the output voltage and it compares the feedback voltage (FB) with the reference
voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the error amp.
decreases.

<OSC Generator>
This circuit generates the oscillation frequency, which in turn generates the source clock.

<Ramp Wave Generator>
The ramp wave generator generates a saw-tooth waveform based on outputs from the phase shift generator.

<PWM Comparator>
The PWM Comparator compares outputs from the error amp. and saw-tooth waveform. When the voltage from the error
amp's output is low, the external switch will be set to ON.

<PWM/PFM Controller>
This circuit generates PFM pulses. Control can be switched between PWM control and PWM/PFM automatic switching
control using external signals. The PWM/PFM automatic switching mode is selected when the voltage of the PWM pin is less
than 0.2V, and the control switches between PWM and PFM automatically depending on the load. As the PFM circuit
generates pulses based on outputs from the PWM comparator, shifting between modes occurs smoothly. PWM control mode
is selected when the voltage of the PWM pin is more than 0.65V. Noise is easily reduced with PWM control since the switching
frequency is fixed. Control suited to the application can easily be selected which is useful in audio applications, for example,
where traditionally, efficiencies have been sacrificed during stand-by as a result of using PWM control (due to the noise
problems associated with the PFM mode in stand-by).

<Synchronous, blank logic>
The synchronous, blank logic circuit is to prevent penetration of the transistor connected to EXT1 and EXT2.

<Vref with Soft Start>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please
refer to next page). To protect against inrush current, when the power is switched on, and also to protect against voltage
overshoot, soft-start time is set internally to 10ms. It should be noted, however, that this circuit does not protect the load
capacitor (C
maintains a balance between the two inputs of the error amps and controls the EXT pin's ON time so that it doesn't increase
more than is necessary.

<Chip Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the CE pin is 0.2V or less, the mode will be
chip disable, the channel's operations will stop. The EXT1 pin will be kept at a high level (the external P-ch MOSFET will be
OFF) and the EXT2 pin will be kept at a high level (the external N-ch MOSFET will be ON). When CE pin is in a state of chip
disable, current consumption will be no more than 3.0μA. When the CE pin's voltage is 0.65V 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 10ms (TYP.)
from the moment of chip enable.

<Output Voltage Setting>
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on
the values of R

The value of CFB1(CFB2), speed-up capacitor for phase compensation, should be fzfb= 1 / (2

to 12kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and value of load
capacity (C

L) from inrush current. With the Vref voltage limited and depending upon the input to the error amps, the operation

FB11 (RFB21) and RFB12 (RFB22). The sum of RFB11 (RFB21) and RFB12 (RFB22) should normally be 1 MΩor less.

OUT = 0.9

V

L).

×

( RFB11 + RFB12 ) / RFB12

×π×

CFB1×RFB11) which is equal

5/20

V

V

(

)

)

XC9303 Series

■ OPERATIONAL EXPLANATION (Continued)

<Output Voltage Setting (Continued)>

[Example of Calculation: When RFB11 = 200kΩand RFB12 = 75kΩ,

[Typical Example]

[External Components]

■EXTERNAL COMPONENTS

VOUT

(V)

RFB11

(kΩ)

RFB12

(kΩ)

2.0 330 270 39 3.3 200 75 62

2.2 390 270 33 5.0 82 18 160

2.5 390 220 33

2.7 360 180 33

3.0 560 240 24

Tr1: CPH6315 (P-ch MOSFET: SANYO), IRLMS6702 (P-ch MOSFET: IR)
Tr2: CPH3409 (N-ch MOSFET: SANYO), IRLMS1902 (N-ch MOSFET: IR)
Tr3: CPH3409 (N-ch MOSFET: SANYO), IRLMS1902 (N-ch MOSFET: IR)
Note: Vgs Breakdown Voltage of CHPH6315 and CPH3409 is 10V so please be

careful with the power supply voltage.
For the power supply voltage more than 8V, CPH3308 (P-ch MOSFET: SANYO)
or CPH3408 (N-ch MOSFET: SANYO) which breakdown voltage is 20V are
recommended.

L :

22μH

(CDRH127/LD, SUMIDA)

SD : CMS02 (Schottky Barrier Diode, TOSHIBA)

CIN :

16V, 47μF

(Tantalum MCE Series, NICHICEMI)

●COIL
PART NUMBER MANUFACTURER L VALUE (μH)

SERIAL

RESISTANCE (Ω)

CDRH127/LD-220 SUMIDA 22 36.4m 4.7 12.3 x 12.3 8

●INPUT / OUTPUT CAPACITANCE
PART NUMBER MANUFACTURER VOLTAGE (V) CAPACITANCE (μF) W x L (mm) H (mm)

16MCE476MD2 NICHICHEMI 16.0 47 4.6 x 5.8 3.2±0.2

●SCHOTTKY BARRIER DIODE

PART NUMBER MANUFACTURER

REVERSE

CURRENT

FORWARD

CURRENT

CMS02 TOSHIBA 30 3 0.4 (IF=3A) 0.5m (VR=30V) 2.4 x 4.7 0.98±0.1

●TRANSISTOR

P-ch MOSFET

ABSOLUTE MAX.

PART NUMBER MANUFACTURER

RATINGS

Rds(ON) MAX.(mΩ) Ciss TYP. (pF) VGS (off) (V) PKG.

VDSS (V) VGSS (V) ID (A)
CPH6315 SANYO - 20 ±10 - 3 150 (VGS= -4.0V) 410 (VGS= -10V) -1.4 (MAX.) CPH6
CPH3308 SANYO - 30 ±20 - 4 140 (VGS= -4.0V) 560 (VGS= -10V) -2.4 (MAX.) CPH3

IRLMS6702 IR - 20 ±12 - 2.3 200 (VGS= -4.5V) 210 (VGS= -15V) -0.7 (MAX.) Micro6

●TRANSISTOR (N-ch MOSFET
PART NUMBER MANUFACTURER VDSS (V) VGSS (V) ID (A) Rds(ON) MAX.(mΩ) Ciss TYP. (pF) VGS (off) (V) PKG.

CPH3409 SANYO 30 +10 5.0 42@VGS=4.0V 630@VGS=10V 1.3 (MAX.) CPH3

CPH3408 SANYO 30 +20 5.0 68@VGS=4.0V 480@VGS=10V 2.4 (MAX.) CPH3

IRLMS1902 IR 20 +12 3.2 100@VGS=4.5V 300@VGS=15V 0.7 (MIN.) Micro6

IRLML2502 IR 20 +12 4.2 45@VGS=4.5V 740@VGS=15V 1.2 (MAX.) Micro3

OUT1 = 0.9

CFB1

(pF)

×

( 200k + 75k ) / 75k = 3.3

VOUT

(V)

RFB11

(kΩ)

RATED CURRENT

(A)

RFB12

(kΩ)

W x L (mm)

.]

CFB1

(pF)

VFmax (V) IRmax (A) W x L (mm) H (mm)

H (mm)

6/20