A7335MP8VR_技术文档

A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

DESCRIPTION

FEATURES

A7335 is a wide input voltage, high efficiency

Synchronous CC/CV step-down DC/DC converter

that operates in either CV (Constant Output Voltage)

mode or CC (Constant Output Current) mode. A7335

provides up to 3.5A output current at EMI friendly

133kHz switching frequency. For >3.0A loading

current, it is advised to add an optional external

power Schottky Diode D1 to relieve partial heat

dissipation as drawn in application diagram. A7335

eliminates the expensive, high accuracy current

sensing resistor, making it an ideal CC charger for

battery charging applications and adaptors with

accurate current limit. The A7335 achieves higher

efficiency than traditional constant current switching

regulators by eliminating its associated power loss on

the additional current sensing resistor.



Up to 30V Input Surge Voltage

Continuous Operating Input Voltage up to 28V

Up to 3.5A Output Current

133kHz Switching Frequency

Up to 93% Efficiency

Stable with Low-ESR Ceramic Capacitors to

Allow Low-Profile Designs



Constant Current Control Without Additional

Current Sensing Resistor Improves Efficiency

and Lowers Cost



Resistor Programmable Current Limit from 1.5A

to 3.5A

Up to 0.5 V Excellent Cable Voltage Drop

Compensation



±7.5% CC Accuracy

±2% Feedback Voltage Accuracy

Advanced Feature Set

Protection features include cycle-by-cycle current

limit, thermal shutdown, and short circuit recovery.

Integrated Soft-Start of

Thermal Shutdown

The A7335 is available in PSOP8 package.

Cycle-by-Cycle Current Limit protection

Available in PSOP8 Package



ORDERING INFORMATION

APPLICATION

Package Type

Part Number

A7335MP8R

A7335MP8VR



Car Charger/ Adaptor

PSOP8

MP8

Rechargeable Portable Devices

General-Purpose CC/CV Supply

USB Power Output Ports

SPQ: 4,000pcs/Reel

V: Halogen free Package

R: Tape & Reel

Note

AiT provides all RoHS products

TYPICAL APPLICATION

Simplified Application Circuit

17 W CC/CV Typical Application Circuit

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

PIN DESCRIPTION

Top View

Pin #

1

Symbol

BS

Function

High Side Bias Pin. This provides power to the internal high-side MOSFET

gate driver.

Connect a 100nF capacitor from BS pin to SW pin.

Power Supply Input. Bypass this pin with a minimum 4.7μF ceramic

capacitor to GND, placed as close to the IC as possible.

Power Switching Output to External Inductor.

2

3

IN

SW

Ground. Connect this pin to a large PCB copper area for best heat

dissipation. Return FB, COMP, and ISET to this GND, and connect this

GND to power GND at a single point for best noise immunity.

Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to

the resistor divider between output and GND to set the output voltage.

Error Amplifier Output. This pin is used to compensate the converter.

Enable Input. EN is pulled up to 5V with a 2MΩ resistance, and contains a

precise 1.95V logic threshold. Drive this pin to a logic-high or leave

unconnected to enable the IC.

4

GND

5

6

FB

COMP

7

EN

Drive to a logic-low to disable the IC and enter shutdown mode.

Output Current Setting Pin. Connect a resistor from ISET to GND to

program the output current.

8

9

ISET

Heat Dissipation Pad. Connect this exposed pad to large ground copper

area with copper and vias.

Exposed Pad

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

ABSOLUTE MAXIMUM RATINGS

Input Supply Voltage

SW Voltage

-0.3V ~ 30V

Boost Voltage

-0.3V ~ (V_SW+ 5.5V)

-0.3V ~ 6V

EN Pin

FB COMP ISET Pin

Junction Temperature

Storage Temperature

Lead Temperature (Soldering 10 sec.)

Class 2 Ratings per ESDA/JEDEC JS-001-2014

Human Body Mode

Operating Ratings

-0.3V ~5.5V

Internally Limited

-55°C ~ +150℃

260℃

±4kV

Input Supply Voltage

Operating Temperature

Max Junction Temperature

Package Thermal Resistance

θ_JA

6V ~ 28V

-40°C ~ +85°C

-40°C ~ 125°C

50℃/W

15℃/W

θ_JC

Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and

operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not

implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

ELECTRICAL CHARACTERISTICS

V_IN= 12V, T_A= +25℃, unless otherwise noted.

Parameter

Input Supply Voltage

Symbol

Conditions

Min.

6

Typ.

-

Max.

28

Unit

V

Input Voltage

Input UVLO

UVLO Threshold

Hysteresis

V_UVLO

V_INRising

V_INFalling

4.3

-

4.65

240

5

-

V

V_UVLOHYS

mV

Input Supply Current

Operation Current

Quiescent Current

Shutdown Supply Current

ENABLE

I_VIN

I_Q

I_OUT= 0mA

V_FB= 1V

V_EN= 0V

-

3.8

2.5

6.5

-

mA

μA

I_SHDN

10

Enable Threshold (High)

Enable Hysteresis

Enable Internal Pull Up

Cable Compensation

I_SETVoltage

V_{EN_HIGH}

V_{EN_HYS}

I_EN

1.8

-

1.95

0.2

6

2.1

-

V

3

10

μA

V_ISET

G_ISET

0.98

-

1.005

1.02

-

V

I_SETto I_OUTDC Current Gain

Error Amplifier

R

_ISET=7.5kΩ

30,000

A/A

Output Sink Current

Output Source Current

Open Loop Gain

Output Voltage

I_SINK

I_SOURCE

G_VO

V_FB=0.7V

V_FB=0.9V

-

150

50

-

μA

4,000

V/V

Feedback Voltage

Feedback Current

Frequency

V_FB

I_FB

792

-

808

0.1

824

50

mV

nA

Switching Frequency

Hiccup Waiting Time

Maximum Duty Cycle

f_{SW_0.8V}

t_{SW_0V}

D_MAX

V_FB= 0.8V

V_FB= 0V

112

113

65

154

kHz

ms

%

-

f_SW= 133kHz

95

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

MOSFET

High Side MOSFET On Resistance^NOTE1

Low Side MOSFET On Resistance ^NOTE1

High Side MOSFET Leakage Current

Low Side MOSFET Leakage Current

Current Limit

R_{DS(ON_H)}

R_{DS(ON_L)}

I_{LEAK_HS}

I_{LEAK_LS}

-

95

75

-

mΩ

μA

V_SW= 0V

V_SW= V_IN

1

-

μA

High Side MOSFET Current Limit

I_{LIM_HS}

R

_ISET=6.8kΩ

-

5

2

-

A

Soft-start

Soft-start Time^NOTE1

t_SS

ms

Thermal Shutdown

Thermal Shutdown Threshold^NOTE1

T_SDN

-

175

25

-

°C

Thermal Shutdown Hysteresis

T_{SDN_HYS}

NOTE1: Guaranteed by design.

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

TYPICAL PERFORMANCE CHARACTERISTICS

All curves taken at V_IN= 12V with configuration in 17W CC/CV typical application circuit for V_OUT= 5.0V shown

in this datasheet. T_A= 25°C, unless otherwise specified.

1.

Efficiency, V_OUT= 3.3V

2.

Efficiency, V_OUT= 5.0V

3.

Load Transient

4.

Load Transient

V_IN=12V, V_OUT=5V, I_OUT=0.5 to 3.0A

V_IN=12 V, V_OUT=9 V, I_OUT=0.5 to 1.5 A

5.

Start up from V_IN

6.

Shutdown form V_IN

V_IN=12V, V_OUT=5V, I_OUT= 3A

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

7.

Start up with Enable Pin

8.

Shutdown with Enable Pin

V_IN=12V, V_OUT=5V, I_OUT= 3A

9.

Short Circuit Protection I_OUT= 0A

10. Short Circuit Protection I_OUT= 3A

11. Output Ripple (CCM)

12. Output Ripple (DCM)

V_IN=12V, V_OUT=5V, I_OUT= 3A

V_IN=12V, V_OUT=5V, I_OUT= 0.1A

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

13. V_FBvs. Temperature

14. V_ISETvs. Temperature

15. Operation Frequency vs. Temperature

16. High side Current limit vs. V_IN

17. EN Threshold Voltage vs. V_IN

18. Quiescent Supply Current vs. V_IN

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

BLOCK DIAGRAM

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

DETAILED INFORMATION

Functional Description

CV/CC Loop Regulation

As seen in Functional Block Diagram, the A7335 is a peak current mode pulse width modulation (PWM)

converter with CC and CV control. The converter operates as follows:

A switching cycle starts when the rising edge of the Oscillator clock output causes the High-Side Power

Switch to turn on and the Low-Side Power Switch to turn off. With the SW side of the inductor now connected

to IN, the inductor current ramps up to store energy in the magnetic field. The inductor current level is

measured by the Current Sense Amplifier and added to the Oscillator ramp signal. If the resulting summation

is higher than the COMP voltage, the output of the PWM Comparator goes high. When this happens or when

Oscillator clock output goes low, the High-Side Power Switch turns off. At this point, the SW side of the

inductor swings to ground through the internal Low Side Power Switch, causing the inductor current to

decrease and magnetic energy to be transferred to output. This state continues until the cycle starts again.

The High-Side Power Switch is driven by logic using BS as the positive rail. This pin is charged to V_SW+ 5V

when the Low-Side Power Switch turns on. The COMP voltage is the integration of the error between FB input

and the internal 0.808V reference. If FB is lower than the reference voltage, COMP tends to go higher to

increase current to the output. Output current will increase until it reaches the CC limit set by the ISET resistor.

At this point, the device will be transition from regulating output voltage to regulating output current, and the

output voltage will drop with increasing load.

The Oscillator normally switches at 133kHz. However, if FB voltage is lower than 0.25V, A7335 will go into

short circuit of auto-restart mode with very low power.

Enable Pin

The A7335 has an enable input EN for turning the IC on or off. The EN pin contains a precision 1.95V

comparator with 200mV hysteresis and a 2MΩ pull-up resistance. The comparator can be used with a resistor

divider from V_INto program a startup voltage higher than the normal UVLO value. It can be used with a

resistor divider from VOUT to disable charging of a deeply discharged battery, or it can be used with a resistor

divider containing a thermistor to provide a temperature-dependent shutoff protection for over temperature

battery. The thermistor should be thermally coupled to the battery pack for this usage.

If left floating, the EN pin will be pulled up to roughly 5V by the internal 2MΩ pull-up resistance. It can be

driven from standard logic signals greater than 1.95V, or driven with open-drain logic to provide digital on/off

control.

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

Thermal Shutdown

The A7335 disables switching when its junction temperature exceeds 175°C and resumes when the

temperature has dropped by 25°C.

APPLICATIONS INFORMATION

Output Voltage Setting

Figure 1. Output Voltage Setting

Figure 1 shows the connections for setting the output voltage. Select the proper ratio of the two feedback

resistors R_FB1and R_FB2based on the output voltage. Adding a capacitor in parallel with R_FB1helps the system

stability. Typically, use R_FB2≈20kΩ and determine R_FB1from the following equation:

V

OUT

R_FB1= R_FB2

(

-1)

0.808V

CC Current Setting

A7335 constant current value is set by a resistor connected between the ISET pin and GND. The CC output

current is approximating linearly proportional to the current flowing out of the ISET pin. The voltage at ISET is

roughly 1V and the current gain from ISET to output is roughly 30,000 (30mA/1μA). To determine the proper

resistor for a desired current, please refer to Figure 2 below.

Figure 2. Curve for Programming Output CC Current

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

Figure 3. CC/CV Curve R4=7.5kΩ, R2=19.6kΩ, R1=105kΩ）

Inductor Selection

The inductor maintains a continuous current to the output load. This inductor current has a ripple that is

dependent on the inductance value:

Higher inductance reduces the peak-to-peak ripple current. The trade off for high inductance value is the

increase in inductor core size and series resistance, and the reduction in current handling capability. In

general, select an inductance value L based on ripple current requirement:

V

IN

^OUTx (V^IN− V^OUT)

L =

V

f

SW

I

LOADMAX RIPPLE

K

Where V_INis the input voltage, V_OUTis the output voltage, f_SWis the switching frequency, IL_OADMAXis the

maximum load current, and K_RIPPLEis the ripple factor. Typically, choose K_RIPPLE= 30% to correspond to the

peak-to-peak ripple current being 30% of the maximum load current.

With a selected inductor value the peak-to-peak inductor current is estimated as:

V^OUTx (V^IN- V^OUT)

I^{LPK - PK}=

L x V^INx f^SW

The peak inductor current is estimated as:

1

2

I_LPK= I_LOADMAX

+

I_LPK-PK

The selected inductor should not saturate at I_LPK

.

The maximum output current is calculated as:

1

2

I_OUTMAX= I_LIM

-

I_LPK-PK

I_LIMis the internal current limit, which is typically 5A, as shown in Electrical Characteristics Table.

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

External High Voltage Bias Diode

It is recommended that an external High Voltage Bias diode be added when the system has a 5V fixed input

or the power supply generates a 5V output. This helps improve the efficiency of the regulator. The high

voltage bias Diode can be a low cost one such as IN4148 or BAT54.

Figure 4. External High Voltage Bias Diode

This diode is also recommended for high duty cycle operation and high output voltage applications.

Input Capacitor

The input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the

converter. A low ESR capacitor is highly recommended. Since large current flows in and out of this capacitor

during switching, its ESR also affects efficiency.

The input capacitance needs to be higher than 4.7μF. Low ESR tantalum or electrolytic types may also be

used provided that the RMS ripple current rating is higher than 50 % of the output current. The input capacitor

should be placed close to the IN and GND pins of the IC, with the shortest traces possible. In the case of

tantalum or electrolytic types, they can be further away if a small parallel 4.7μF ceramic capacitor is placed

right next to the IC.

Output Capacitor

The output capacitor also needs to have low ESR to keep low output voltage ripple. The output ripple voltage

is:

V^IN

V_RIPPLE= I_OUTMAXx K_RIPPLER_ESR+

2

8 x f^SWLC OUT

Where I_OUTMAXis the maximum output current, K_RIPPLEis the ripple factor, R_ESRis the ESR of the output

capacitor, f_SWis the switching frequency, L is the inductor value, and C_OUTis the output capacitance. In the

case of ceramic output capacitors, R_ESRis very small and does not contribute to the ripple. Therefore, a lower

capacitance value can be used for ceramic type. In the case of tantalum or electrolytic capacitors, the ripple is

dominated by RESR multiplied by the ripple current. In that case, the output capacitor is chosen to have

sufficiently low ESR.

For ceramic output capacitor, typically choose a capacitance of about 4.7μF. For tantalum or electrolytic

capacitors, choose a capacitor with less than 50mΩ ESR.

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

STABILITY COMPENSATION

Figure 5. Stability Compensation

C_COMP2is needed only for high ESR output capacitor.

The feedback loop of the IC is stabilized by the components at the COMP pin, as shown in Figure 5.

The DC loop gain of the system is determined by the following equation:

0.808V

A_VDC

=

A_VEAG_COMP

I

OUT

The dominant pole P1 is due to C_COMP

:

G

EA

f_P1

=

2πAVEA

C

COMP

The second pole P2 is the output pole:

I

OUT

f_P2

=

2πVOUT

C

OUT

The first zero Z1 is due to R_COMPand C_COMP

:

1

f_Z1

=

2πRCOMP

CCOMP

And finally, the third pole is due to R_COMPand C_COMP2(if C_COMP2is used):

1

f_P3

=

2πRCOMPCCOMP2

The following steps should be used to compensate the IC:

STEP 1. Set the cross over frequency at 1/10 of the switching frequency via R_COMP

V^OUTC^OUTf^SW

:

2π

R_COMP

=

(Ω)

10GEAGCOMP x 0.808V

STEP 2. Set the zero fZ1 at 1/4 of the cross over frequency. The equation for C_COMPis:

4

C_COPM

=

(F)

2

π

f

SWR

COMP

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

STEP 3. If the output capacitor’s ESR is high enough to cause a zero at lower than 4 times the cross over

frequency, an additional compensation capacitor C_COMP2is required. The condition for using C_COMP2is:

2

R_ESRCOUT

≥

(Ω)

2πfSWCOUT

And the proper value for C_COMP2is:

C

OUT

R

COMP

ESRCOUT

C_COMP2

=

R

Though C_COMP2is unnecessary when the output capacitor has sufficiently low ESR, a small value C_COMP2such

as 100pF may improve stability against PCB layout parasitic effects.

CC Loop Stability

The constant-current control loop is internally compensated over the 1,500mA-3,500mA output range. No

additional external compensation is required to stabilize the CC current.

Output Cable Voltage-Drop Compensation

To compensate for resistive voltage drop across the charger's output cable, the A7335 integrates a simple,

user-programmable cable voltage drop compensation using the impedance at the FB pin. Use the curve in

Figure 6 to choose the proper feedback resistance values for cable compensation. R_FB1is the high side

resistor of voltage divider.

In the case of high R_FB1used, the frequency compensation needs to be adjusted correspondingly. As show in

Figure 7, adding a capacitor in paralleled with R_FB1or increasing the compensation capacitance at COMP pin

helps the system stability.

Figure 6. Cable Voltage-Drop Compensation at

Various Resistor Divider Values

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

Figure 7. Frequency Compensation for High R_FB1

PC Board Layout Guidance

Figure 8 showed the example of components placement and PCB layout. When laying out the printed circuit

board, the following checklist should be used to ensure proper operation of the IC.

1） Arrange the power components to reduce the AC loop size， consisting of input ceramic capacitor C1, IN

pin, SW pin .

2） Place input decoupling ceramic capacitor C1 as close to IN pin as possible. C1 is connected power GND

with vias or short and wide path.

3） Return FB, COMP and ISET to signal GND pin, and connect the signal GND to power GND at a single

point for best noise immunity. Connect exposed pad to power ground copper area with copper and vias.

4） Use copper plane for power GND for best heat dissipation and noise immunity.

5） Place feedback resistor close to FB pin.

6） Use short trace connecting BS-C3-SW loop.

Figure 8. Example of PCB Layout

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

PACKAGE INFORMATION

Dimension in PSOP8 Package (Unit: mm)

Millimeters

Inches

Max

Symbol

Min

Max

Min

A

A1

A2

b

1.400

0.050

1.350

0.330

0.170

4.700

3.202

3.800

5.800

2.313

1.700

0.150

1.550

0.510

0.250

5.100

3.402

4.000

6.200

2.513

0.055

0.002

0.053

0.013

0.007

0.185

0.126

0.150

0.228

0.091

0.067

0.006

0.061

0.020

0.010

0.200

0.134

0.157

0.244

0.099

c

D

D1

E

E1

E2

e

1.270BSC

1.04 REF

0.050BSC

0.041 REF

L

0.400

1.270

0.016

0.050

L1

L1-L1’

θ

-

0.12

8°

-

0.005

8°

0°

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A7335

DC-DC CONVERTER BUCK (STEP-DOWN)

30V, 3.5A SYNCHRONOUS CV/CC

AiT Semiconductor Inc.

www.ait-ic.com

IMPORTANT NOTICE

AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to

discontinue any integrated circuit product or service without notice, and advises its customers to obtain the

latest version of relevant information to verify, before placing orders, that the information being relied on is

current.

AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to

be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT

products in such applications is understood to be fully at the risk of the customer. As used herein may involve

potential risks of death, personal injury, or server property, or environmental damage. In order to minimize

risks associated with the customer's applications, the customer should provide adequate design and

operating safeguards.

AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT

warrants the performance of its products of the specifications applicable at the time of sale.

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型号：	A7335MP8VR
厂家：	AiT Semiconductor
描述：	DC-DC CONVERTER BUCK SYNCHRONOUS CV/CC DC-DC转换器
文件：	总18页 (文件大小：888K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

A7335MP8VR [AITSEMI]

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