XC9235A146DR [TOREX]

Analog Circuit;


型号：	XC9235A146DR
厂家：	Torex Semiconductor
描述：	Analog Circuit
文件：	总7页 (文件大小：237K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

☆GO-Compatible

Preliminary

◆Synchronous Step-Down DC/DC Converters

■APPLICATIONS

◆High Efficiency

◆Low Ripple

: 92%

●Mobile phones (PDC, GSM, CDMA, IMT2000 etc.)

●Bluetooth equipment

: 10mV

◆Output Current

◆Oscillation Frequency

: 600mA

: 600kHz,

1.2MHz, 3.0MHz

●PDAs, Portable communication modem

●Portable games

●Cameras, Digital cameras

●Cordless phones

●Notebook computers

◆PWM Fixed Control

(XC9235 series)

(XC9236 series)

(XC9237 series)

◆

PWM/PFM Automatic Switching Control

Manual Selection of Switching Control

◆Maximum Duty Ratio

: 100%

◆Ceramic Capacitor Compatible

◆Ultra Small Packages

: SOT-25, USP-6C

■GENERAL DESCRIPTION

■FEATURES

The

XC9235/9236/9237

series

group

P-Ch Driver Tr. Built-In

N-Ch Synchronous Driver

Tr. built-in

: ON resistance 0.42Ω

: ON resistance 0.52Ω

synchronous-rectification type DC/DC converters with a

built-in 0.42 Ω P-channel driver transistor and 0.52 Ω

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 1.8V to 6.0V.

Output voltage is internally programmable in a range from

0.8V to 4.0V in increments of 50mV <accuracy: ±1.5%(±

2.0%)>. With the built-in oscillator, oscillation frequency is

selectable from 600kHz, 1.2MHz, and 3.0MHz to make

available the frequency best suited to your particular

application. As for operation mode, the XC9235 series is

PWM control, the XC9236 series is automatic PWM/PFM

switching control and the XC9237 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).

Input Voltage Range

Output Voltage Range

: 1.8V~6.0V

: 0.8V~4.0V

(50mV increments)

: 92% (TYP.)

High Efficiency

Output Current

: 600mA

Oscillation Frequency

: 600kHz, 1.2MHz, 3.0MHz

(Fixed frequency accuracy ±15%)

: SOT-25 (SOT-23-5), USP-6C

Packages

Soft-Start Circuit Built-In

Current Limiter Circuit Built-In (Constant Current & Latching)

Low ESR Ceramic Capacitor Compatible

* Performance 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 1.4V or lower.

Two types of

package, SOT-25 (250mW) and USP-6C (100mW), are

available.

■TYPICAL PERFORMANCE

CHARACTERISTICS

●Efficiency vs. Output Current

■TYPICAL APPLICATION CIRCUIT

(VIN=4.2V, VOUT=1.8V)

100

PWM/PFM Automatic Switching Control

3.0MHz

L: 1.5uH (NR3015)

CL: 10uF (ceramic)

CIN: 4.7uF (ceramic)

3.0MHz

PWM Control

3.0MHz

1.2MHz

L: 4.7uH (NR3015)

CL: 10uF (ceramic)

CIN: 4.7uF (ceramic)

3MHz PFM

1.2MHz PFM

3MHz PWM

1.2MHz PWM

0.1

100

1000

Output Current:IOUT(mA)

1/7

XC9235_36_37 ETR_0514_001

XC9235/9236/9237 Series

■PIN CONFIGURATION

VOUT

VIN 6

1 Lx

VSS 5

2 VSS

3 VOUT

CE/MODE 4

VIN

VSS CE/MODE

USP-6C

SOT-25 (TOP VIEW)

(BOTTOM VIEW)

* Please short the VSS pin (pin no. 2 and 5).

* The dissipation pad for the USP-6C package should

be solder-plated in recommended mount pattern and

metal masking so as to enhance mounting strength

and heat release. If the pad needs to be connected

to other pins, it should be connected to the VSS pin.

(pin no. 5).

■PIN ASSIGNMENT

PIN NUMBER

PIN NAME

FUNCTION

SOT-25

USP-6B

2, 5

VIN

VSS

CE / MODE

VOUT

Power Input

Ground

Chip Enable Mode Switch

Output Voltage Sense

Switching Output

■PRODUCT CLASSIFICATION

●Ordering Information

XC9235①②③④⑤⑥

XC9236①②③④⑤⑥

XC9237①②③④⑤⑥

PWM fixed control

PWM / PFM automatic switching control

PWM fixed controlQPWM / PFM automatic switching, manual switching

DESIGNATOR

DESCRIPTION

SYMBOL

DESCRIPTION

Transistor built-in,

Output voltage internally

set (VOUT product),

①

②

③

: CE input logic High Active

Soft-start internally set

Current limit: 900mA

: Integer number of output voltage

Output Voltage

0~4

e.g. VOUT=2.8V→②=2

: Decimal number of output voltage

50mV increments: 05=A, 15=B, 25=C, 35=D, 45=E, 55=F, 65=H, 75=K,

0~9,

A~M

Output Voltage

85=L, 95=M

e.g. VOUT=2.8V→②=2, ③=8

VOUT=2.85V→②=2, ③=L

600kHz

④

Oscillation Frequency

1.2MHz

3.0MHz

SOT-25 (SOT-23-5)

USP-6C

⑤

⑥

Package

Embossed tape, standard feed

Embossed tape, reverse feed

Device Orientation

2/7

XC9235/9236/9237

Series

■PACKAGING INFORMATION

●SOT-25 (SOT-23-5)

●USP-6C

3/7

XC9235/9236/9237 Series

■BLOCK DIAGRAM

Phase

Compensation

Current Feedback

Current Limit

VOUT

PWM

Comparator

Error Amp.

Synch.

Buffer

Drive

Logic

VIN

Vrefw ith

PWM/PFM

Selector

Soft Start,

Ramp Wave

Generator

OSC

U.V.L.O. Cmp

U.V.L.O.

VSS

CE/MODE

Control Logic

CE/MODE

NOTE: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside,

and XC9235 series chooses only PWM control.

The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside,

and XC9236 series chooses only PWM/PFM automatic switching control.

■ABSOLUTE MAXIMUM RATINGS

Ta=25℃

UNITS

PARAMETER

VIN Pin Voltage

SYMBOL

VIN

RATINGS

- 0.3 ~ 6.5

- 0.3 ~ VIN + 0.3 or 6.5V

- 0.3 ~ 6.5

Lx Pin Voltage

VLx

VOUT Pin Voltage

CE / MODE Pin Voltage

Lx Pin Current

VOUT

VCE

ILx

- 0.3 ~ 6.5

±1200

SOT-25

USP-6C

600 *

1100 *

Power Dissipation

Operating Temperature Range

Storage Temperature Range

* When mounted on the PC board.

Topr

Tstg

- 40 ~ + 85

- 55 ~ +125

℃

4/7

XC9235/9236/9237

Series

■ELECTRICAL CHARACTERISTICS

XC9237A18Cxx

VOUT=1.8V, FOSC=1.2MHz, Ta=25℃

PARAMETER

SYMBOL

VOUT

CONDITIONS

MIN.

TYP.

MAX.

UNIT CIRCUIT

When connected to external components,

CE=VIN, IOUT=30mA

Output Voltage

1.764 1.800 1.836

Operating Voltage Range

Maximum Output Current

VIN

1.8

6.0

VIN=VOUT + 1.5V,

IOUTMAX

600

When connected to external components

CE=VIN, VOUT=0V, Voltage which Lx pin

voltage holding "L" level

VIN=CE=3.6V, VOUT=set voltage×1.1V

VIN=3.6V, CE=0V,

U.V.L.O. Voltage

Supply Current

Stand-by Current

VUVLO

IDD

1.00

1.40

1.78

μA

Istb

1.0

VOUT=set voltage×1.1V

When connected to external components,

IOUT=100mA

When connected to external components,

CE=VIN, IOUT=1mA

Oscillation Frequency

FOSC

1020

1200

160

1380

kHz

PFM Switch Current

Maximum IPFM Limit

IPFM

MAXIPFM

100

200

Maximum Duty Ratio MAXDTY CE=VIN, VOUT=0V

Minimum Duty Ratio

MINDTY CE=VOUT=VIN

When connected to external components,

CE=VIN=3.0V, IOUT=100mA

Efficiency

EFFI

Lx SW “H” ON Resistance

Lx SW “L” ON Resistance

Lx SW “H” Leak Current

Lx SW “L” Leak Current

Current Limit

RLxH

RLxL

ILeakH

ILeakL

ILIM

CE=0.5VIN, VOUT=0V, ILx=100mA

CE=0.5VIN, ILx=100mA

VIN=VOUT=5.0V, CE=0V, Lx=0V

VIN=VOUT=5.0V, CE=0V, Lx=5.0V

VIN=CE=5.0V, VOUT=setting voltage x 0.9V

0.42

0.52

0.01

900

1.0

μA

Output Voltage

Temperature Characteristics

△

OUT

IOUT=30mA, -40℃≦Topr≦85℃

±100

ppm/ ℃

VOUT・△topr

VOUT=0V, When CE voltage is applied Lx

determine "H"

VOUT=0V, When CE voltage is applied Lx

determine "L"

CE “H” Voltage

CE “L” Voltage

VCEH

VCEL

0.65

VSS

VIN

0.25

PWM “H” Level Voltage

PWM “L” Level Voltage

CE “H” Current

VPWMH

VPWML

ICEH

VIN - 1.0

0.1

μA

VIN - 0.3

- 0.1

CE “L” Current

ICEL

0.1

When connected to external components,

CE=0V → VIN, IOUT=1mA

VIN=CE=5.0V, VOUT=Setting Voltage x

0.9V, Short Lx by 1Ω resistance

Soft-Start Time

Latch Time

TSS

Tlat

1.0

msec

1.0

20.0

The ratio to the output voltage becomes a

VSHORT threshold voltage

ex.) When VOUT=1.8V, VSHORT=0.9V (TYP.)

Short Protection

Threshold Voltage

5/7

XC9235/9236/9237 Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9237A 18Dxx

VOUT=1.8V, FOSC=3.0MHz, Ta=25℃

MIN. TYP. MAX. UNIT CIRCUIT

PARAMETER

SYMBOL

VOUT

CONDITIONS

When connected to external components,

CE=VIN, IOUT=30mA

Output Voltage

1.764 1.800 1.836

①

Operating Voltage Range

Maximum Output Current

VIN

1.8

6.0

VIN=VOUT+1.5V, when connected to external

components

IOUTMAX

600

CE=VIN, VOUT=0V, Voltage which Lx

Pin voltage holding "L" level

VIN=CE=3.6V, VOUT=set voltagex1.1V

VIN=3.6V, CE=0V,

U.V.L.O. Voltage

Supply Current

Stand-by Current

VUVLO

IDD

1.00

1.40

1.78

②

③

μA

Istb

1.0

VOUT=set voltage×1.1V

When connected to external components,

IOUT=100mA

When connected to external components,

CE=VIN, IOUT=1mA

Oscillation Frequency

PFM Switch Current

FOSC

IPFM

2550

3000

220

3450

kHz

①

Maximum IPFM Current MAXIPFM

Maximum Duty Ratio MAXDTY CE=VIN, VOUT=0V

100

200

①

④

Minimum Duty Ratio

MINDTY CE=VOUT=VIN

When connected to external components,

Efficiency (*2)

EFFI

①

CE=VIN=3.0V, IOUT=100mA

CE=0.5VIN, VOUT=0V, ILx=100mA

CE=0.5VIN, ILx=100mA

VIN=VOUT=5.0V, CE=0V, Lx=0V

VIN=VOUT=5.0V, CE=0V, Lx=5.0V

VIN=CE=5.0V, VOUT=setting voltage x 0.9V

IOUT=30mA,

Lx SW “H” ON Resistance

Lx SW “L” ON Resistance

Lx SW “H” Leak Current

Lx SW “L” Leak Current

Current Limit

RLxH

RLxL

ILeakH

ILeakL

ILIM

0.5

0.01

900

⑤

⑥

⑦

1.0

μA

Output Voltage

△VOUT

+100

ppm/ ℃

①

⑧

Temperature Characteristics VOUT・△topr -40℃≦Topr≦85℃

VOUT=0V, When CE voltage is applied Lx

determine "H"

VOUT=0V, When CE voltage is applied Lx

determine "L"

CE “H” Voltage

CE “L” Voltage

VCEH

VCEL

0.65

VSS

VIN

0.25

PWM “H” Level Voltage

PWM “L” Level Voltage

CE “H” Current

VPWMH

VPWML

ICEH

VIN-1.0

0.1

μA

①

⑧

VIN-0.3

- 0.1

CE “L” Current

ICEL

0.1

When connected to external components,

CE=0V→VIN, IOUT=1mA

VIN=CE=5.0V, VOUT=Setting Voltage x 0.9V,

Short Lx by 1Ω resistance

Soft-Start Time

Latch Time

TSS

Tlat

1.0

msec

①

⑨

1.0

20.0

The ratio to the output voltage becomes

VSHORT a threshold voltage

ex.) When VOUT=1.8V, VSHORT=0.9V (TYP.)

Short Protection

Threshold Voltage

⑨

6/7

XC9235/9236/9237

Series

1. The products and product specifications contained herein are subject to change without

notice to improve performance characteristics. Consult us, or our representatives

before use, to confirm that the information in this catalog is up to date.

2. We assume no responsibility for any infringement of patents, patent rights, or other

rights arising from the use of any information and circuitry in this catalog.

3. Please ensure suitable shipping controls (including fail-safe designs and aging

protection) are in force for equipment employing products listed in this catalog.

4. The products in this catalog are not developed, designed, or approved for use with such

equipment whose failure of malfunction can be reasonably expected to directly

endanger the life of, or cause significant injury to, the user.

(e.g. Atomic energy; aerospace; transport; combustion and associated safety

equipment thereof.)

5. Please use the products listed in this catalog within the specified ranges.

Should you wish to use the products under conditions exceeding the specifications,

please consult us or our representatives.

6. We assume no responsibility for damage or loss due to abnormal use.

prior permission of Torex Semiconductor Ltd.

7/7

XC9235A146DR [TOREX]

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