Diodes AP8802 User Manual

AP8802

Description

The AP8802 is a step-down DC/DC converter designed to drive
LEDs with a constant current. The device can drive up to thirteen
LEDs, depending on the forward voltage of the LEDs, in series from
a voltage source of 8V to 48V. Series connection of the LEDs
provides identical LED currents resulting in uniform brightness and
eliminating the need for ballast resistors. The AP8802 switches at
frequencies up to 700kHz. This allows the use of small size
external components, hence minimizing the PCB area needed.

Maximum output current of AP8802 is set via an external resistor
connected between the V
achieved by applying either a DC voltage or a PWM signal at the
CTRL input pin. An input voltage of 0.2V or lower at CTRL shuts
down the output at SW and puts the device into a low-current
standby state.

and SET input pins. Dimming is

IN

Features

• LED driving current up to 1A

• High efficiency up to 92%

• Operating input voltage up to 48V

• High switching frequency up to 700kHz

• PWM/DC input for dimming control

• Built-in output open-circuit protection

• SO-8, SO-8EP and U-DFN3030-10 are available in “Green”

Molding Compound (No Br, Sb)

• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/ EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.

Typical Application Circuit

Pin Assignments

SET

GND

NC
V

IN

Applications

• Commercial & industrial lighting

• Small LCD panel backlight

• Appliances interior lighting

• Architecture Detail lighting

1A LED STEP-DOWN CONVERTER

(Top View)

2

AP8802

3
4

SO-8

SET

GND

NC
NC

V

IN

8
7
6
5

CTRL
GND

SET

GND
SW
SW

(Top View)

1
2

AP8802

3
4
5

U-DFN3030-10

NC

V

IN

(Top View)

2
3
4

10

CTRL
GND

9
8

NC

7

SW

6

SW

AP8802

SO-8EP

8
7
6
5

CTRL
GND

SW
SW

AP8802

Document number: DS31766 Rev. 9 - 2

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1A LED STEP-DOWN CONVERTER

Pin Descriptions

Name SO-8 SO-8EP U-DFN3030-10 Function

SW 6, 5 6, 5 7, 6

GND 2 2 2, 9 GND pin

SET 1 1 1 Set Nominal Output Current Pin. Configure the output current of the device.

CTRL 8 8 10

VIN

NC 3 3 3, 4, 8 No connection

EP - EP EP

4 4 5 Input Supply Pin. Must be locally bypassed.

Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin
to reduce EMI.

Dual function dimming control pin.

• Input voltage of 0.2V or lower forces the device into low current standby mode
and shuts off the output.

• A PWM signal (driven by an open-drain/collector source) allows the output
current to be adjusted over a wide range up to 100%.

• An analog voltage between 0.3V and 2.5V adjusts the output current between
25% and 200% of the current set by 0.2V/R

The input impedance is about 50kΩ, and if the pin is left open V

Exposed pad: Internally connected to IC substrate.
It should be connected to GND and as large as possible thermal mass for improved

thermal impedance and power dissipation capability.
However the exposed pad is not a Power GND return path. The dedicated GND pins must
be connected to 0V. See Land Pad diagrams.

.

S

CTRL

Functional Block Diagram

AP8802

= V

REF

AP8802

Document number: DS31766 Rev. 9 - 2

Figure. 1 Functional Block Diagram

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AP8802

Absolute Maximum Ratings (T

Symbol Parameter Rating Unit

VIN VIN pin voltage

VSW

V

CTRL

V

SENSE

TJ

T

LEAD

T

ST

Note: 4 All voltages unless otherwise stated are measured with respect to GND.

5. V

Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are
stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this
specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended
periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be
taken when handling and transporting these devices

SW voltage -0.3 to +50 V

CTRL Pin Input Voltage -0.3 to +6 V

SET Voltage (Note 5) +0.3 to -5 V
Junction Temperature 150
Lead Temperature Soldering 300
Storage Temperature Range -65 to +150

is measured with respect to VIN.

SENSE

Recommended Operating Conditions (T

Symbol Parameter Min Max Unit

VIN

V

CTRLDC

V

CTRL

f

OSC

TA

Duty Cycle Using inductor ≥ 100µH (Note 8) 0.10 0.95 —

Notes: 6. For 100% brightness either leave floating or connect to 1.25V relative to GND.

7. AP8802 will operate at higher frequencies but accuracy will be affected due to propagation delays and also increased power dissipation will occur
due to increased switching losses.

8. For most applications the LED current will be within 8% over the duty cycle range specified. Duty cycle accuracy is also dependent on propagation
delay. Smaller size inductors can be used but LED current accuracy may be greater than 8% at extremes of duty cycle. This is most noticeable at
low duty cycles (less than 0.1) or when the input voltage is high and only one LED is being driven.

Operating input voltage relative to GND 8.0 48.0 V
Voltage range for 24% to 200% DC dimming relative to GND (Note 6) 0.3 2.5 V
Voltage low for PWM dimming relative to GND 0 0.2 V
Maximum switching frequency (Note 7) — 625 kHz
Ambient temperature range -40 +105 °C

AP8802

Document number: DS31766 Rev. 9 - 2

= +25°C) (Note 4)

A

= +25°C)

A

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-0.3 to +50 V

1A LED STEP-DOWN CONVERTER

o

C

o

C

o

C

May 2012

© Diodes Incorporated

AP8802

Electrical Characteristics (T

Symbol Parameter Conditions Min Typ. Max Unit

I

OUT

IQ

V

THD

V

SENSEHYS

SET SET pin input current
V

REF

R

DS(ON)

I

SW_LEAKAGE

θ

θ

Notes: 9. Refer to figure 8 for the device derating curve.

10. Test condition for SO-8, SO-8EP and U-DFN3030-10: Device mounted on FR-4 PCB, 2”x2”, 2oz copper, minimum recommended pad layout on top
layer and thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.

Continuous switch current (Note 9) — — 1 A
Quiescent Current — 75 120 μA
Internal Threshold Voltage 184 200 216 mV
Sense threshold hysteresis — 15 — %

Internal Reference Voltage — 1.25 — V
On Resistance of MOSFET
Switch leakage current — — 8 μA

Thermal Resistance Junction-to-

JA

Ambient

Thermal Resistance Junction-to-Case

JC

= +25°C, VIN = 12V; unless otherwise specified.)

A

V

= V

IN

= 0.8A

-0.2

SET

I

SW

SO-8 (Note 10) — 82 — °C/W
SO-8EP (Note 10) — 45 — °C/W
U-DFN3030-10 (Note 10) — 38 — °C/W
SO-8 (Note 10) — 52 — °C/W
SO-8EP (Note 10) — 7 — °C/W
U-DFN3030-10 (Note 10) — 24 — °C/W

1A LED STEP-DOWN CONVERTER

— 5 — μA

— 0.65 1.10 Ω

AP8802

Document number: DS31766 Rev. 9 - 2

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2

R

CUR

RENT

CUR

REN

T

Typical Characteristics

0.9



0.8

0.7

AP8802

1A LED STEP-DOWN CONVERTER

1.256

1.254

0.6

0.5

0.4

0.3

0.2

0.1

NON-SWITCHING SUPPLYCURRENT (mA)

0

0484448121620242832 4036

Figure. 2 Supply Current (not switching) vs. Input Voltage

1.

1.0

0.8

Ω

()

0.6

DS(ON)

0.4

0.2

0

-40 -25 -10 5 20 35 50 65 80 95 110 125

Figure. 4 R vs. Ambient Temperature

1200

1000

(mA )

800

INPUT VOLTAGE (V)

AMBIENT TEMPERATURE (°C)

DS(ON)

R = 0.2

Ω

SET

R = 0.3

SET

Ω

1.252

1.250

1.248

CTRL VOLTAGE (V)

1.246

1.244

-40 125-25 110-10520355065 9580
AMBIENT TEMPERATURE (°C)

1000

(mA)

LED

Figure. 3 V vs. Ambient Temperature

900
800
700
600

500
400
300
200
100

0

0 0.5 1.0 1.5 2.0 2.5

800
700

600

500

CTRL

R RESISTANCE ( )

SET

Figure. 5 LED Current vs. R

Ω

SET

600

400

LED

200

0

0 0.5 1 1.5 2 2.5

CTRL VOLTAGE (V)

Figure. 6 LED Current vs. V

AP8802

Document number: DS31766 Rev. 9 - 2

R = 0.68

SET

CTRL

Ω

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400

300

200

SWITCHING FREQUENCY (kHz)

100

0

02.50.5 1 1.5 2

Figure. 7 Switching Frequency vs. V

CTRL VOLTAGE (V)

CTRL

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TCHINGFREQ

U

k

H

UTYCY

C

Typical Characteristics (T

1A LED STEP-DOWN CONVERTER

= +25°C, VIN = 40V, L = 68µH; unless otherwise stated.)

A

AP8802

10

8
6

4
2
0

-2

-4

-6

OUTPUT CURRENT DEVIATION (%)

-8

-10
61218 4824 30 36 42

Figure. 8 LED Current vs. Input Voltage

500

T = +25°C

A

450

R = 0.2

z)

ENCY (

SWI

SET

L = 68µH

400
350
300

250
200

1 LED

150
100

50

0

61218 4824 30 36 42

Figure. 10 Switching Frequency vs. Input Voltage

INPUT VOLTAGE (V)

Ω

3 LEDs

5 LEDs

INPUT VOLTAGE (V)

7 LEDs

61218 4824 30 36 42

100

LE (%)

D

Figure 9. Efficiency vs. Input Voltage

90
80
70

60
50
40
30
20
10

0

61218 4824 30 36 42

Figure. 11 Duty Cycle vs. Input Voltage

INPUT VOLTAGE (V )

SUPPLY VOLTAGE (V)

Fig. 12 Steady State Waveforms

AP8802

Document number: DS31766 Rev. 9 - 2

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Fig.13 Start-Up Showing LED Current Soft Start

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May 2012

Application Information

LED Current Control

The LED current is controlled by the resistor R
LED(s) with the CTRL pin open circuit is defined as:

V
R

THD
SET

I = where V

LED

SET

is the voltage between the VIN and SET pins and is nominally 200mV.

THD

AP8802

1A LED STEP-DOWN CONVERTER

in Figure 14 connected between VIN and SET. The nominal average output current in the

Figure. 14 Typical Application Circuit for I

LED

= 1A

Inductor Selection

This section highlights how to select the inductor suitable for the application requirements in terms of switching frequency, LED current
accuracy and temperature.

The inductor influences the LED current accuracy that the system is able to provide. The following section highlights how to select the
inductor in relation to the device packages and the LED current, while maintaining the chip temperature below 70°C.

500

450

400

350

300

250

200

FREQUENCY (kHz)

150

100

50

0

0 50 100 150 200 250 300 350 400 450 500

68

100

47

68

47

68

Figure. 15 Switching Frequency vs. Inductor Value

100

100

150

150

150

INDUCTOR VA LUE (µH)

Switching Frequency @ I = 700mA

220

220

220

LED

12V - 3 LEDs
24V - 5 LEDs
48V - 10 LEDs

470

470

470

AP8802

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Application Information (cont.)

AP8802 U-DFN3030-10 Minimum Recommended Inductor - LED Current 1A

12
11
10

9
8
7
6
5

NUMBER of LEDs

4
3
2
1

0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0

Figure. 16 U-DFN3030-10 Recommended Inductor with 1A LED Current



AP8802

1A LED STEP-DOWN CONVERTER

8% Accuracy, <70°C Case Temperature

Supply Voltage (V)

AP8802 SO-8EP Minimum Recommended Inductor

8% Accuracy, <70°C Case Temperature, 1A Target Current

12
11
10

9
8
7
6
5

NUMBER of LEDs

4
3
2
1

0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0

AP8802

Document number: DS31766 Rev. 9 - 2

Figure. 17 SO-8EP Recommended Inductor with 1A LED Current

SUPPLY VOLTAGE (V)

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Application Information (cont.)

12
11
10

9
8
7
6
5

NUMBER of LEDs

4
3
2
1

AP8802

1A LED STEP-DOWN CONVERTER

AP8802 S O -8 Minimum Recommended Inductor

8% Accuracy, <70°C Case Temperature

0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0

Figure. 18 SO-8 Recommended Inductor with 700mA LED Current

Supply Voltage (V)

Capacitor Selection

The small size of ceramic capacitors makes them ideal for AP8802 applications. X5R and X7R types are recommended because they retain
their capacitance over wider voltage and temperature ranges than other types such as Z5U. A 2.2μF input capacitor is sufficient for most
intended applications of AP8802.
A 4.7μF input capacitor is suggested for application with an input voltage equal or higher than 40V.

Diode Selection

Schottky diodes, e.g. B2100 or B1100, with their low forward voltage drop and fast reverse recovery, are the ideal choice for AP8802
applications.

AP8802

Document number: DS31766 Rev. 9 - 2

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AP8802

Application Information (cont.)

LED Current Adjustment/Dimming

The LED current for the AP8802 can be adjusted by driving the CTRL with a digital signal (PWM dimming) or by driving the CTRL with a DC
voltage between 0.3V and 2.5V (dc dimming).

If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:

V

I ×=

LED

V

1200

0.39

1000

800

0.2

0.47

0.56

CTRL

REF

V

THD

R

SET

where V

1A LED STEP-DOWN CONVERTER

is nominally 1.25V

REF

LED Current @
V = 1.25V

CTRL

LED Current @
V = 2.5V

CTRL

LED Current @
V = 0.625V

CTRL

0.39

0.47

0.47

0.56

0.68

0.68

0.68

0.82

0.82

0.82

1

1.2

1.5

1

1.2

1.2

1.5

1.5

1

2

2

2

3

3

3

600

LED CURRENT (mA)

400

0.33

0.2

0.33

200

0

0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0

R VALUE ()

SET

Figure. 19 LED Current Setting vs. R and V

Ω

SET CTRL

Figure 19 shows that reducing the CTRL voltage by a factor of 2 also reduces the LED curr ent by a factor of 2. The AP8802 has the ability
vary the LED current by a factor of 2 above the default value set by R

down to a factor of 0.24 of the nominal LED current. This provides

SET

an 8.33:1 dynamic range of the dc dimming.
A low pass filter on the CTRL pin of the AP8802 automatically provides some soft-start function of the LED current on initial start-up (this

phenomenon can be seen in figure 7); the built in soft-start period can be increased by the addition of an external capacitor onto the CTRL
pin.

The AP8802’s dimming range can be increased above this DC dimming factor by applying a PWM signal to the CTRL pin using this method
dimming dynamic ranges above 100 can be achieved.

AP8802

Document number: DS31766 Rev. 9 - 2

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AP8802

Application Information (cont.)

PWM Dimming of LED Current

When a low frequency PWM signal with voltages between 2.5V and a low level of zero is applied to the CTRL pin the output current will be
switched on and off at the PWM frequency. The resultant LED current I

A Pulse Width Modulated (PWM) signal with a max resolution of 8-bit, can be applied to the CTRL pin to change the output current to a value
above or below the nominal average value set by resistor R

To achieve this resolution the PWM frequency has to be lower than 500Hz. The ultimate resolution will be determined by the number of
switching cycles required to get back to nominal LED current once the PWM voltage is high relative to PWM frequency. Lower switching
frequencies and higher PWM frequencies will result in lower PWM dimming dynamic ranges.

SET

.

will be proportional to the PWM duty cycle. See Figure 20.

LEDavg

1A LED STEP-DOWN CONVERTER

Figure 20. Low Frequency PWM Operating Waveforms

There are different ways of accomplishing PWM dimming of the AP8802 LED current:

Directly Driving CTRL Input

A Pulse Width Modulated (PWM) signal with duty cycle DPWM can be applied to the CTRL pin to adjust the output current to a value above or
below the nominal average value set by resistor R
drive voltage of 2.5V (where extra brightness is required) or 1.25V if a maximum of 100% brightness is required.

A way of avoiding over-driving the CTRL pin is use an open collector/drain driver to drive the CTRL pin.

. When driving the CTRL with a voltage waveform care should be taken not to exceed a

SET

Driving the CTRL Input via Open Collector Transistor

The recommended method of driving the CTRL pin and controlling the amplitude of the PWM waveform is to use a small NPN s witching
transistor. This uses the internal pull-up resistor between the CTRL pin and the internal voltage reference to pull-up CTRL pin when the
external transistor is turned off.

Driving the CTRL Input From a Microcontroller

If the CTRL pin is driven by a MOSFET (either discrete or open-drain output of a micro-controller) then Schottky diode maybe be re quired due
to high Gate / Drain capacitance, which could inject a negative spike into CTRL input of the AP8802 and cause erratic operation but the
addition of a Schottky clamp diode (eg Diodes Inc. SD103CWS) to ground and inclusion of a series resistor (3.3k) will prevent this.

AP8802

Document number: DS31766 Rev. 9 - 2

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AP8802

d

OFT-STAR

T

T

P

OWER

P

T

O

Application Information (cont.)

Soft-Start

An external capacitor from the CTRL pin to ground will provide a soft-start delay, by increasing the time taken for the voltage on this pin to
rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator. Adding capacitance
increases this delay by approximately 200µs/nF. The graph below shows the variation of soft-start time for different values of capacitor.

16
14

12
10

IME (ms)

8
6
4

S

2
0

-2
020406080100120

Figure. 21 Soft-Start Time vs. Capacitance

from ADJ Pin to Groun

Thermal Considerations

The graph below in Figure 22, gives details for power derating. This assumes the device to be mounted on a 25x25mm PCB with 1oz copper
standing in still air.

AP8802

Document number: DS31766 Rev. 9 - 2

2.6

2.4

2.2

2.0

1.8

N (W)
I

1.6

A

1.4

1.2

DISSI

1.0

0.8

0.6

0.4

0.2

0.0
0255075100125

SO-8EP

SO-8

AMBIENT TEMPERATURE ( C)

Maximum Power Dissipation

Figure. 22 A 8802 De rating CurvesP

www.diodes.com

CAPACITANCE (nF)

U-DFN3030-10

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1A LED STEP-DOWN CONVERTER

°

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AP8802

Application Information (cont.)

Package Selection

The device comes with a wide selection of packages. The suggested package is able to provide a case temperature below 70°C (with an
ambient temperature of +25°C) for the combination of input voltage and load requested.

1A LED STEP-DOWN CONVERTER

12 LEDs
11 LEDs

10 LEDs

9 LEDs
8 LEDs

7 LEDs
6 LEDs
5 LEDs

4 LEDs

8 10121416182022242628303234363840424446

V

Figure. 22 Suggested Package @ I = 1A and 100µH Inductor

IN

LED

3 LEDs

2 LEDs

1 LED

48

12 LEDs
11 LEDs

10 LEDs

9 LEDs
8 LEDs

7 LEDs
6 LEDs

5 LEDs

4 LEDs

3 LEDs

8 10121416182022242628303234363840424446

Figure. 23 Suggested Package @ I = 700mA and 100µH Inductor

AP8802

Document number: DS31766 Rev. 9 - 2

V

IN

LED

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2 LEDs

1 LED

48

© Diodes Incorporated

May 2012

AP8802

Applications Information (cont.)

Fault Condition Operation

The AP8802 has by default open LED protection. If the LEDs should become open circuit the AP8802 will stop oscillating; the SET pin will
rise to V

If the LEDs should become shorted together the AP8802 will continue to switch however the duty cycle at which it will operate will change
dramatically and the switching frequency will most likely decrease. The on-time of the internal power MOSFET switch will be significantly
reduced because almost all of the input voltage is now developed across the inductor. The off-time will be significantly increased because the
reverse voltage across the inductor is now just the Schottky diode voltage (See Figure 20) causing a much slower decay in inductor c urrent.
During this condition the inductor current will remain within its controlled levels and so no excessive heat will be generated within the
AP8802.

and the SW pin will then fall to GND. No excessive voltages will be seen by the AP8802.

IN

1A LED STEP-DOWN CONVERTER

Figure. 24 Switching Characteristics (normal open to short LED chain)

AP8802

Document number: DS31766 Rev. 9 - 2

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X

Ordering Information





AP8802

1A LED STEP-DOWN CONVERTER

AP 8802 XX G -

Package PackingGreen

S : SO-8
SP : SO-8EP
FN : U-DFN3030-10

Device Package Code

AP8802SG-13 S SO-8 2500/Tape & Reel -13

AP8802SPG-13 SP SO-8EP 2500/Tape & Reel -13

AP8802FNG-7 FN U-DFN3030-10 3000/Tape & Reel -7

Notes: 11. 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.

Packaging

(Note 11)

Quantity Part Number Suffix

7/ 13 : Tape & ReelG : Green

7”/13” Tape and Reel

Marking Information

(1) SO-8

( Top View )

5

G : Green

YY

: Year : 08, 09,10~

X

41

WW : Week : 01~52; 52
represents 52 and 53 week

X

: Internal Code

(2) SO-8EP

Logo

Part Number

8

AP8802

WW X

YY

( Top View )

Logo

Part No.

AP8802

Document number: DS31766 Rev. 9 - 2

8

AP8802

WW X

YY

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5

E

X

41

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G : Green

: Year : 08, 09,10~

YY

: Week : 01~52; 52

WW

represents 52 and 53 week

: Internal Code

X
SOP-8L-EP

May 2012

© Diodes Incorporated

Marking Information (cont.)

(3) U-DFN3030-10

( Top View )

XX : Identification Code

Y

X X

XY

W

Part Number Package Identification Code

AP8802FNG-7 U-DFN3030-10 A5

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SO-8

E1

E

A1

Detail ‘A’

h

°

45

A2

A3

A

e

b

D

AP8802

Document number: DS31766 Rev. 9 - 2

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

W

a~z : 27~52 week; z represents

52 and 53 week

X

: A~Z : Green

0.254

Gaug e Plan e
Seating Plane

L

7°~9

°

Detail ‘A’

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AP8802

1A LED STEP-DOWN CONVERTER

Dim Min Max

SO-8

A - 1.75
A1 0.10 0.20
A2 1.30 1.50
A3 0.15 0.25

b 0.3 0.5
D 4.85 4.95
E 5.90 6.10

E1 3.85 3.95

e 1.27 Typ

h - 0.35

L 0.62 0.82

0° 8°

θ

All Dimensions in mm

© Diodes Incorporated

May 2012

1A LED STEP-DOWN CONVERTER

Package Outline Dimensions (cont.) (All Dimensions in mm)

(2) Package Type: SO-8EP

85

E1

14

F

Exposed Pad

H

9° (All si de s)

e

D

A1

b

4° ± 3°

A

7

°

Bottom View

N

E

45

°

E0

Q

C

L

Gauge Plane
Seating Plane

(3) Package Type: U-DFN3030-10

A

A1

Pin#1 ID

E

E2

e

z

AP8802

Document number: DS31766 Rev. 9 - 2

D2

D

b

A3

SEATING PLANE

L

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www.diodes.com

SO-8EP (SOP-8L-EP)

Dim Min Max Typ

A 1.40 1.50 1.45

A1 0.00 0.13 -

b 0.30 0.50 0.40
C 0.15 0.25 0.20
D 4.85 4.95 4.90

E 3.80 3.90 3.85
E0 3.85 3.95 3.90
E1 5.90 6.10 6.00

e - - 1.27

F 2.75 3.35 3.05

H 2.11 2.71 2.41

L 0.62 0.82 0.72

N - - 0.35

Q 0.60 0.70 0.65

All Dimensions in mm

U-DFN3030-10

Dim Min Max Typ

A 0.57 0.63 0.60

A1 0 0.05 0.02
A3

⎯ ⎯

0.15

b 0.20 0.30 0.25

D 2.90 3.10 3.00

D2 2.30 2.50 2.40

e

⎯ ⎯

0.50

E 2.90 3.10 3.00

E2 1.50 1.70 1.60

L 0.25 0.55 0.40
z

⎯ ⎯

0.375

All Dimensions in mm

AP8802

May 2012

© Diodes Incorporated

1A LED STEP-DOWN CONVERTER

Suggested Pad Layout

(1) Package Type: SO-8

X

Dimensions Value (in mm)

X 0.60

Y 1.55
C1 5.4
C2 1.27

C1

C2

Y

(2) Package Type: SO-8EP

X

2

Y

2

Y

1

X

1

Y

C

X

Dimensions

C 1.270

X 0.802
X1 3.502
X2 4.612

Y 1.505
Y1 2.613
Y2 6.500

(3) Package Type: U-DFN3030-10

AP8802

Document number: DS31766 Rev. 9 - 2

Y

C

X1

G

X

G

Dimensions Value (in mm)

Z 2.60
G 0.15
X 1.80

X1 0.60

Y 0.30
C 0.50

Z

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www.diodes.com

Value

(in mm)

AP8802

May 2012

© Diodes Incorporated

AP8802

IMPORTANT NOTICE

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 AND 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 Incorporated 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. Any 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, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased 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 against all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, 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.

LIFE SUPPORT

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

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

1. are intended to implant into the body, or

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

B. A critical component is any component in a life support devic e 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 against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.

Copyright © 2012, Diodes Incorporated

www.diodes.com

1A LED STEP-DOWN CONVERTER

AP8802

Document number: DS31766 Rev. 9 - 2

19 of 19

www.diodes.com

May 2012

© Diodes Incorporated