Diodes AP7173 User Manual

1.5A LOW DROPOUT LINEAR REGULATOR WITH

Description

The AP7173 is a 1.5A low-dropout (LDO) linear regulator that features a user-programmable soft-start, an enable input and a power-good output.

The soft-start reduces inrush current of the load capacitors and minimizes stress on the input power source during startup. The enable input and power-good output allow users to configure power management solutions that can meet the sequencing requirements of FPGAs, DSPs, and other applications with different start-up and power-down requirements.

The AP7173 is stable with any type of output capacitor of

2.2µF or more. A precision reference and feedback control deliver 2% accuracy over load, line, and operating temperature ranges. The AP7173 is available in both DFN3030-10 and SO-8EP packages.

PROGRAMMABLE SOFT-START

Pin Assignments

1

IN IN

2 3

PG

VCC

4 5

EN

1

IN

PG

2

3

EN

4

( T op View )

DFN3030-10

(T op View)

SO-8EP

AP7173

10

OUT

9

OUT FB

8 7

SS

6

GND

OUT

8

7

FB

SSVCC

6

GND

5

Features

● Low V

● Bias voltage (V

● Low V

● Low dropout: 165mV typical at 1.5A, V

● 2% accuracy over line, load and temperature range

● Power-Good (PG) output for supply monitoring and for

sequencing of other supplies

and wide VIN range: 1.0V to 5.5V

IN

) range: 2.7V to 5.5V

VCC

range: 0.8V to 3.3V

OUT

VCC

= 5V

Applications

• PCs, Servers, Modems, and Set-Top-Boxes

• FPGA Applications

• DSP Core and I/O Voltages

• Post-Regulation Applications

• Applications With Sequencing Requirements

● Programmable soft-start provides linear voltage startup

● Bias supply permits low V

operation with good transient

IN

response

● Stable with any output capacitor ≥ 2.2µF

● DFN3030-10 and SO-8EP: available in “Green” molding

compound (No Br, Sb)

● Lead-free finish/ RoHS Compliant (Note 1)

Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

V

R3

V

IN

C1

V

VCC

PG

VCC

AP7173

OUT

FB SS

R1

R2

OUT

C2

C3

AP7173

Document number: DS31369 Rev. 9 - 2

EN

GND

C

SS

Figure 1. Typical Application Circuit (Adjustable Output)

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Typical Application Circuit (Continued)

Table 1. Resistor Values for Programming the Output Voltage (Note 2)

R1 (kΩ) R2 (kΩ) V

Short Open 0.8

0.619 4.99 0.9

1.13 4.53 1

1.37 4.42 1.05

1.87 4.99 1.1

2.49 4.99 1.2

4.12 4.75 1.5

3.57 2.87 1.8

3.57 1.69 2.5

3.57 1.15 3.3

Note: 2 VOUT = 0.8 x (1 + R1 / R2)

Table 2. Capacitor Values for Programming the Soft-Start Time(Note 3)

CSS SOFT-START TIME

Open 0.1ms 270pF 0.5ms 560pF 1ms

2.7nF 5ms

5.6nF 10ms

0.01μF 18ms

Note: 3. tSS(s) = 0.8 x CSS(F) / (4.4 x 10–7)

AP7173

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

(V)

OUT

AP7173

Document number: DS31369 Rev. 9 - 2

Figure 2. Turn-On Response

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Pin Descriptions

Pin Name

IN 1 1, 2 Power Input pin.

PG 2 3

VCC 3 4

EN 4 5

GND 5 6 Ground.

SS 6 7

FB 7 8

OUT 8 9, 10 Regulated Output pin.

Thermal Pad — —

SO-8EP DFN3030-10

Functional Block Diagram

PIN #

AP7173

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

Description

Power-Good pin, open-drain output. When the V PG threshold the PG pin is driven low; when the V threshold, the PG pin goes into a high-impedance state. To use the PG pin, use a 10kΩ to 1MΩ pull-up resistor to pull it up to a supply of up to

5.5V, which can be higher than the input voltage. Bias Input pin, provides input voltage for internal control circuitry. This voltage should be higher than the V Enable pin. This pin should be driven either high or low and must not be floating. Driving this pin high enables the regulator, while pulling it low puts the regulator into shutdown mode.

Soft-Start pin. Connect a capacitor between this pin and the ground to set the soft-start ramp time of the output voltage. If no capacitor is connected, the soft-start time is typically 100µS. Feedback pin. Connect this pin to an external voltage divider to set the output voltage.

Solder this pad to large ground plane for increased thermal performance.

.

IN

is below the

OUT

exceeds the

OUT

IN

EN

VCC

PG

AP7173

Document number: DS31369 Rev. 9 - 2

Gate

Driver

Current Limit and

Thermal Shutdown

+

-

+

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0.8V

0.72V

OUT

SS

FB

GND

April 2011

AP7173

r

Absolute Maximum Ratings (Note 4)

Symbol Paramete

ESD HBM Human Body Model ESD Protection 4000 V

ESD MM Machine Model ESD Protection 350 V

VIN, V

Notes: 4. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

5. Ratings apply to ambient temperature at 25°C . The JEDEC High-K board design used to derive this data was a 2 inch x 2 inch multilayer board with 1-ounce internal power and ground planes and 2-ounce copper traces on the top and bottom of the board.

Recommended Operating Conditions

Symbol Parameter Min Max Unit

Note: 6. At VIN =1V, the maximum load currents may be lower than 1.5A.

Input Voltage Range -0.3 to +6 V

VCC

VEN Enable Voltage Range -0.3 to +6 V

VPG Power-Good Voltage Range -0.3 to +6 V

VSS Soft-Start Voltage Range -0.3 to +6 V VFB Feedback Voltage Range -0.3 to +6 V

V

Output Voltage Range -0.3 to VIN +0.3 V

OUT

I

Maximum Output Current Internally Limited

OUT

PD

TJ Junction Temperature Range -40 to +150 ºC

TST Storage Junction Temperature Range -65 to +150 ºC

V

IN

V

VCC

I

OUT

T

A

Continuous Total Power Dissipation (Note 5)

Input Voltage (Note 6) 1.0 5.5 V Bias Voltage 2.7 5.5 V Output Current 0 1.5 A Operating Ambient Temperature -40 85 ºC

DFN3030-10 3690 SO-8EP 5650

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

Ratings Unit

mW

AP7173

Document number: DS31369 Rev. 9 - 2

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AP7173

)

Electrical Characteristics

At VEN = 1.1V, VIN = V unless otherwise noted. Typical values are at T

Symbol Parameter Test Conditions Min Typ. Max Unit

VIN Input Voltage Range V

V

VCC

V

REF

V

OUT

ΔV

/ΔVIN /

OUT

V

OUT

ΔV

/V

OUT

/ΔI

VDO

ICL Current Limit V

I

Short-Circuit Current V

SHORT

I

Bias Pin Current 1 2 mA

VCC

I

SHDN

IFB Feedback Pin Current –1 0.1 1 µA

PSRR

TST Startup Time R

ISS

V

Enable Input High Level 1.1 5.5 V

EN, HI

V

Enable Input Low Level 0 0.4 V

EN, LO

V

Enable Pin Hysteresis 50 mV

EN, HYS

IEN Enable Pin Current VEN= 5V 0.1 1 µA

V

PG Trip Threshold V

PG, TH

V

PG Trip Hysteresis 3 %V

PG, HYS

V

PG Output Low Voltage IPG= 1mA (sinking), V

PG, LO

I

PG Leakage Current VPG= 5.25V, V

PG, LKG

TSD

θ

JA

θ

JC

Notes: 7. V

8. Tested at 0.8V; resistor tolerance is not taken into account.

9. Dropout is defined as the voltage from V

10. Test condition for DFN3030-10: Device mounted on FR-4 substrate (2s2p), 2"*2" PCB, with 2oz copper trace thickness and large pad pattern.

11. Test condition for SOP-8L-EP: Device mounted on FR-4 substrate (2s2p), 2"*2" PCB, with 2oz copper trace thickness and large pad pattern.

should be higher or equal to VIN in this chip.

VCC

+ 0.5V, C

OUT

Bias Pin Voltage Range (Note 7) Internal Reference (Adj.) Output Voltage Range V

Accuracy (Note 8)

Line Regulation V

= 0.1uF, CIN = C

VCC

2.7 5.5 V TA = +25 ºC 0.792 0.8 0.808 V

= 5V, I

IN

2.97V≤V 50mA≤I

OUT (NOM)

A

Load Regulation 50mA≤I

= 1.5A,V

Dropout Voltage (Note 9)

Shutdown Supply Current (I

GND

)

I

OUT

I

= 1.5A, VIN = V

OUT

= 80% x V

OUT

< 0.2V 0.6 1 A

OUT

≤0.4V 1 50 µA

V

EN

1KHz, I

= 1.8V, V

Power-Supply Rejection (V

IN

to V

OUT

)

V

IN

300KHz, I V

= 1.8V, V

IN

1KHz, I

= 1.8V, V

Power-SupplyRejection (V

VCC

to V

OUT

)

Soft-Start Charging Current

Thermal Shutdown Temperature

Thermal Resistance Junction-to-Ambient

Thermal Resistance Junction-to-Case

VI

N

300KHz, I V

= 1.8V, V

IN

LOAD

VSS= 0.4V 440 nA

decreasing 85 90 94 %V

OUT

Shutdown, temperature increasing +150 Reset, temperature decreasing +130 DFN3030-10 (Note 10)

SO-8EP (Note 11) 23 DFN3030-10 (Note 10) 4.9 SO-8EP (Note 11) 1.8

to V

IN

OUT

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

= 10uF, I

OUT

= +25°C.

= 1.5A 0.8 3.3 V

OUT

≤5.5V,

VCC

≤1.5A

OUT

+ 0.5≤VIN, 5.5V 0.03 %/V

≤1.5A 0.09 %/A

OUT

VCC–VOUT(NOM)

VCC

OUT (NOM

= 1A,

OUT

for I

when V

= 1.5V

OUT

=1A,

OUT

=1.5V

OUT

= 1A,

=1.5V

OUT

= 1A,

OUT

=1.5V

OUT

= 1.0A, CSS = open 100 µS

OUT

OUT>VPG, TH

is 3% below nominal.

OUT

= 50mA, V

OUT

= 5.0V, and TA = –40°C to +85°C,

VCC

+ VDO 5.5 V

OUT

–2 ±0.5 2 %

≥3.25V 165 270 mV

1.5 1.7 V 2 3 4 A

60

dB

30 50

dB

30

OUT<VPG, TH

0.3 V

0.1 1 µA ºC

35

o

C/W

o

C/W

OUT OUT

AP7173

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V

Typical Characteristics

AP7173

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

At TA = +25℃, VIN = V

0.20

0.15

0.10

0.05

0.00

-0.05

change in Vout(%)

-0.10

-0.15

-0.20

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Figure. 3 VIN Line Regulation

Figure. 5 Load Regulation

240 220 200 180 160 140 120 100

80

VDropout(Vin-Vout)(V)

60 40 20

0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5

Figure. 7 VIN Dropout Voltage vs.

I

+ 0.3V, V

OUT(TYP)

25oC 125oC

-40oC

Vin-Vout(V)

VCC

= 5V, I

25oC

125oC

Iout(mA)

and Temperature (TA)

OUT

= 50mA, VEN = VIN, CIN = 1µF, C

OUT

Vout(V)

VDropout(Vin-Vout)(mV)

-40oC

= 4.7µF, and C

VCC

0.5

0.4

0.3

0.2

0.1

0.0

-0.1

-0.2

-0.3

-0.4

-0.5

0.51.01.52.02.53.03.54.0

25oC

Figure. 4 V

= 10µF, unless otherwise noted.

OUT

125oC

-40oC

Vvcc-Vout(V)

Line Regulation

CC

1.0

0.8

0.6

0.4

0.2

0.0

-0.2

Change Vout(%)

-0.4

-0.6

-0.8

-1.0

125oC

50 200 350 500 650 800 950 1100 1250 1400

25oC

-40oC

Iout(mA)

Figure .6 Load Regulation

300 280 260 240 220 200 180 160 140 120 100

80 60 40 20

0

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

125oC

25oC

-40oC

Iout=1.5A

Vvcc-Vout(V)

Figure. 8 VIN Dropout Voltage vs.

(V

VCC-VOUT

) and Temperature (TA)

1500

AP7173

Document number: DS31369 Rev. 9 - 2

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AP7173

V

Typical Characteristics (Continued)

At TA = +25°C, VIN = V

200

180

160

140

120

100

80

60

VDropout(Vin-Vout)(mV)

40

20

0

-40oC

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

Figure. 9 VIN Dropout Voltage vs. (V

CC-VOUT

90

80

70

60

50

40

30

20

Power Supply Rejection Ratio(dB)

10

Vin=1.8V Vout=1.2V Vvcc=5V Css=1nF

0

10 100 1000 10000 100000

Figure. 11 V

90

80

Vout=1.2V Iout=1.5A

70

Css=1nF

60

50

40

30

20

Power Supply Rejection Ratio(dB)

10

0

0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50

Figure. 13 VIN PSRR vs. (VIN-V

AP7173

Document number: DS31369 Rev. 9 - 2

+ 0.3V, V

OUT(TYP)

Iout=0.5A

25oC

Vvcc-Vout

) and Temperature (TA)

Io=0.1A

Io=1.5A

Frequency(Hz)

PSRR vs. Frequency

IN

Vin-Vout(V)

VCC

= 5V, I

125oC

= 50mA, VEN = VIN, CIN = 1µF, C

OUT

1KHz

10KHz

100KHz

500KHz

OUT

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

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= 4.7µF, and C

VCC

2000

1800

1600

1400

1200

1000

VDropout(Vvcc-Vout)(mV)

800

600

0.00 0.25 0.50 0.75 1.00 1.25 1.50

-40oC

Figure. 10 V

I

OUT

90

80

70

60

50

40

Vin=1.8V Vout=1.2V Vvcc=5V Css=1nF

0

10 100 1000 10000 100000 1000000 1E7

Power Supply Rejection Ratio(dB)

30

20

10

Figure. 12 V

0.8

0.7

0.6

0.5

0.4

0.3

0.2

VoL Low-Level PG Voltage(V)

0.1

0.0 024681012

Figure. 14 Low-Level PG Voltage vs Current

= 10µF, unless otherwise noted.

OUT

125oC

Iout(A)

Dropout Voltage vs.

VCC

and Temperature (TA)

Frequency(Hz)

PSRR vs. Frequency

VCC

PG Current(mA)

25oC

Io=0.1A

Io=1.5A

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V

Typical Characteristics (Continued)

At TA = +25°C, VIN = V

OUT(TYP)

+ 0.3V, V

VCC

= 5V, I

OUT

1.5A LOW DROPOUT LINEAR REGULATOR WITH

= 50mA, VEN = VIN, CIN = 1µF, C

AP7173

PROGRAMMABLE SOFT-START

= 4.7µF, and C

VCC

= 10µF, unless otherwise noted.

OUT

Figure. 15 VIN Line Transient Figure. 16 V

Figure. 17 Output Load Transient Figure. 18 Turn-On Respon se

2.0

1.8

1.6

1.4

1.2

1.0

Ivcc(mA)

0.8

0.6

0.4

0.2

0.0

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

Figure. 19 V

25oC

-40oC

Pin Current vs. I

CC

Iout(A)

125oC

and Temperature

OUT

Line Transient

CC

2.0

1.8

1.6

1.4

1.2

1.0

Ivcc(mA)

0.8

0.6

0.4

0.2

0.0

2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6

25oC

-40oC

Vvcc(V)

Figure. 20 VCC Pin Current vs. V

125oC

and Temperature

CC

AP7173

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pg

Typical Characteristics (Continued)

At TA = +25°C, VIN = V

1.25

1.20

1.15

1.10

1.05

1.00

0.95

0.90

0.85

Quiescent Current(IGND) (mA)

0.80

0.75

0.00 0.25 0.50 0.75 1.00 1.25 1.50

Figure. 21 Quiescent Current vs. I

1.50

1.25

1.00

Quiescent Current(mA)

0.75

0.50

-50-250 255075100125

Figure. 23 Quiescent Current vs. Temperature

500

OUT(TYP)

Vout=1.2V

Vvcc=3.3V

+ 0.3V, V

= 5V, I

VCC

Vin=2.5V

Iout(A)

Vvcc=5V

Temperature(oC)

OUT

Vin=1.8V

Vin=1.8V Vout=1.2V

1.5A LOW DROPOUT LINEAR REGULATOR WITH

= 50mA, VEN = VIN, CIN = 1µF, C

1.50

1.25

1.00

Quiescent Current(mA)

0.75

0.50

OUT

3.0

2.9

2.8

2.7

2.6

2.5

2.4

Current limit(A)

2.3

2.2

2.1

2.0

Figure. 24 Current Limit vs. (V

AP7173

PROGRAMMABLE SOFT-START

= 4.7µF, and C

VCC

Vin=1.8V Vout=1.2V

2.50 2.75 3.00 3.25 3.50

Figure 22. Quiescent Current vs. V

25oC

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

= 10µF, unless otherwise noted.

OUT

Io=0A

Io=1.5A

Io=0.5A

Vvcc(V)

-40oC

125oC

Vvcc-Vout(V)

VCC-VOUT

VCC

)

475

450

425

400

Iss(nA)

375

350

325

300

-50-250 255075100125

Temperature(oC)

Figure. 25 Soft-Start Charging Current (ISS) vs.

Temperature

AP7173

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Figure. 26 Power-Up/Power-Down

April 2011

1.5A LOW DROPOUT LINEAR REGULATOR WITH

Application Notes

BIAS VOLTAGE V

The AP7173 is a low VIN, low dropout regulator that uses an NMOS pass FET. The VCC pin must be connected to a DC bias supply V the gate drive of the pass FET to function properly and to obtain low dropout. The V higher than the V 27 illustrates the typical application circuit for the AP7173.

VCC

for the internal control circuitry and

VCC

needs to be equal to or

and in the range of 2.7V-5.5V. Figure

IN

VCC

AP7173

PROGRAMMABLE SOFT-START

Using high quality, low ESR capacitors and placing them close to the OUT and GND pins can improve perfomance.

DROPOUT VOLTAGE

The very low dropout makes the AP7173 well suited for high-current, low V

/low V

IN

specified low-dropout performance for such applications, the VCC pin should be connected to a separate supply of at least 3.25V higher than V application circuit where V

applications. To achieve the

OUT

. Figure 28 shows an

OUT

is 5V and V

VCC

is 1.2V.

OUT

Figure 27. Typical Application Circuit for AP7173

ADJUSTABLE OUTPUT VOLTAGE

With an external voltage divider, the AP7173 can provide output voltage from 0.8V to 3.3V. R1 and R2 can be calculated for any output voltage using the following equation, where V

=0.8 is the AP7173’s internal

REF

reference voltage. Refer to Table 1 for resistor combinations for commonly used output voltages. For maximum voltage accuracy, R2 should be ≤ 5kΩ.

V

= V

OUT

x (1 + R1/R2)

REF

INPUT VIN AND BIAS V

CAPACITORS

VCC

It is important to keep the IN and VCC pins clear of large

Figure. 28 Typical Application Circuit for AP7173

Using Separate VCC and IN Rails

For applications where low dropout is not required or a separate V

supply is not available, the IN and VCC pins

VCC

can be tied together. In this situation, a voltage difference of at least 1.7V between the V maintained for the V

to provide enough gate drive to

VCC

the pass FET. Therefore, the V more below V

, as shown in Figure 29.

IN

and V

VCC

needs to be 1.7V or

OUT

ripples, glitches and other noises by connecting capacitors to the IN and VCC pins. The required capacitance on thes e pins is strongly dependent on source and wiring impedance of the supplies. To provide good decoupling for the input power supply V

,

IN

it is recommended that a ceramic capacitor with capacitance of at least 1μF is connected between the IN and GND pins at a location as close to them as possible. High quality, low ESR capacitors should be used for better performance. It is critical to provide good decoupling to the VCC pin for the AP7173’s internal control circuitry to function properly. The minimum recommended capacitance for the V 1μF when the V and V

are connected to the same supply, the

VCC

recommended minimum capacitance for V

and VIN are separate supplies. If the VIN

VCC

is 4.7μF.

VCC

Again good quality, low ESR capacitors should be used for optimum performance.

OUTPUT CAPACITOR

The output capacitor affects the stability and transient response of the LDO. The AP7173 is designed to be stable for all types of output capacitors ≥ 2.2μF, single or multiple

VCC

is

Figure. 29 Typical Application Circuit for AP7173

Without an Auxiliary VCC Rail

PROGRAMMABLE SOFT-START

The AP7173 features a voltage-controlled soft-start that is programmable with an external capacitor (C AP7173 achieves a monotonic soft-start by tracking the voltage ramp of the external soft-start capacitor until the ramp voltage reaches the internal reference voltage.

in parallel.

AP7173

Document number: DS31369 Rev. 9 - 2

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has to be

OUT

). The

SS

April 2011

1.5A LOW DROPOUT LINEAR REGULATOR WITH

Application Notes (Continued)

PROGRAMMABLE SOFT-START (cont.)

The relationship between the soft-start time and the softstart charging current (I and the internal reference voltage (V

t

SS

Refer to Table 2 for suggested soft-start capacitor values

ENABLE/SHUTDOWN

The EN pin can be used with standard digital signals or relatively slow-ramping analog signals. Pulling the V below 0.4V turns the regulator off, while driving the V above 1.1V turns the regulator on. Figure 30 shows an example where an RC circuit is used to delay start the AP7173. If not used, the EN pin can be connected to the VCC or IN pin when the V decoupling measures are taken for the EN pin.

is greater than 1.1V, as long as good

IN

), soft-start capacitance (CSS),

SS

) is

REF

= (V

x CSS) / I

REF

SS

EN EN

AP7173

PROGRAMMABLE SOFT-START

over-current protection circuitry to protect the device against overload conditions. It limits the device current to a typical value of 3A and reduces the V tries to pull more current.

For more effective protection against short-circuit failure, the AP7173 also includes a short-circuit foldback mechanism that lowers the current limit to a typical value of 1.0A when the VFB drops to below 0.2V.

THERMAL PROTECTION

Thermal shutdown limits the AP7173 junction temperature and protects the device from damage as a result of overheating. Thermal protection turns off the V

OUT

junction temperature rises to approximately +150°C, allowing it to cool down. When the junction temperature drops to approximately +130°C, the output is re-enabled. Therefore, the thermal protection circuit may cycle on and off at a rate dependent on the power dissipation, thermal resistance, and ambient temperature.

when the load

OUT

when the AP7173’s

Figure 30. Delayed Start Using an RC Circuit to Enable AP7173

POWER-GOOD

The power-good (PG) pin is an open-drain output and can be pulled up through a resistor of 10kΩ to1MΩ to V or any other rail that is 5.5V or lower. When the V V

PG,TH+VPG,HYS

V

drops to below V

OUT

, the PG output is high-impedance; if the

, V

PG,TH

≤ 1.9V or the device i s

VCC

, V

IN

OUT

≥

OUT

disabled, the PG pin is pulled to low by an internal MOSFET.

OVER-CURRENT AND SHORT-CIRCUIT PROTECTION

The AP7173 features a factory-trimmed, temperature and supply voltage compensated internal current limit and an

POWER DISSIPATION

Thermal shutdown is intented to protect the AP7173 against abnormal overheating. For normal operation, excessive power dissipation should be avoided and good heatsinking should be provided. Power dissipation in the device is the product of the device dropout voltage and the load current,

P

= (V

- V

D

IN

As can be seen, power dissipation can be minimized by using the lowest input voltage necessary to achieve the required output voltage regulation. To ensure that the device junction temperature does not exceed the specified limit of 125°C, an application should provide heat conduction paths that have junction-toambient thermal resistance lower than the calculated value here:

= (125°C –T

R

θJA

For the DFN package with exposed pad, the primary conduction path for heat is through the exposed pad to the printed circuit board (PCB). The pad should be attached to an appropriate amount of copper PCB area to ensure that the device does not overheat.

) x I

OUT

) / P

A

D

AP7173

Document number: DS31369 Rev. 9 - 2

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XX

X

P

Ordering Information



AP 7173 -

AP7173

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

G -

Package Green

FN : DFN 3030-10

SO-8E

SP :

Device

AP7173-FNG-7 FN DFN3030-10 3000/Tape & Reel -7

AP7173-SPG-13 SP SO-8EP 2500/Tape & Reel -13

Note: 12. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.

Package

Code

Packaging

(Note 12)

G : Green

Quantity Part Number Suffix

Packing

7/13 : Tape & Reel

7”/13” Tape and Reel

Marking Information

(1) DFN3030-10

( Top View )

XX : Identification Code

Y

: Year : 0~9 : Week : A~Z : 1~26 week;

W

Y

W X

XX

a~z : 27~52 week; z represents

52 and 53 week

: A~Z : Green

X

Part Number Package Identification Code

AP7173 DFN3030-10 BA

(2) SO-8EP

AP7173

Document number: DS31369 Rev. 8 - 2



Logo

Part No.

( Top View )

8

5

AP7173

YY

WW X

X

41

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E

G : Green

YY

: Year : 08, 09,10~

WW

: Week : 01~52; 52

represents 5 2 and 53 week

X

: Internal Code

SO-8EP

April 2011

1.5A LOW DROPOUT LINEAR REGULATOR WITH

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: DFN3030-10

AP7173

PROGRAMMABLE SOFT-START

(2) Package Type: SO-8EP

1

7°~9°

1.27typ

1

8x-0.60

6x-1.27

8x-1.55

Land Pattem Recommendation

0.3/0.5

4.85/4.95

(Unit:mm)

3.85/3.95

1.30/1.50

Exposed pad

5.4

7°~9°

5.90/6.10

1.75max.

Detail "A"

45°

0.35max.

0.15/0.25

0/0.13

Detail "A"

3.70/4.10

0.62/0.82

3.3Ref.

Bottom View

0.254

Gauge Plane Seating Plane

Exposed pad

2.4Ref.

1

AP7173

Document number: DS31369 Rev. 8 - 2

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Tape Orientation

For DFN3030-10

AP7173

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

Notes: 13. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf

AP7173

Document number: DS31369 Rev. 8 - 2

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AP7173

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY A ND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporat ed does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. A ny Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harml ess ag ai nst all damages.

Diodes Incorporated does not warrant or acc ept any liability whatsoever in respec t of any products purchas ed through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless agai nst all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death ass ociated with such unintended or unauthorized application.

Products described herein may be covered by one or more United Stat es, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herei n:

A. Life support devices or systems are devices or systems which:

1. are intended to impl ant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructi ons for us e provided in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any c omponent in a life support device or system whose failure to perform can be reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness .

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives agai nst any damages arising out of the use of Diodes Incorporated products in such safety-critic al, l ife support devic es or syst ems .

www.diodes.com

1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START

IMPORTANT NOTICE

LIFE SUPPORT

AP7173

Document number: DS31369 Rev. 8 - 2

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Diodes AP7173 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual