CAT4238 Datasheet by ON Semiconductor

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April, 2016 − Rev. 5 1Publication Order Number:

CAT4238/D

CAT4238

LED Driver, Boost, 10 LED,

series

Description

The CAT4238 is a DC/DC step−up converter that delivers an

accurate constant current ideal for driving LEDs. Operation at a fixed

switching frequency of 1 MHz allows the device to be used with small

value external ceramic capacitors and inductor. LEDs connected in

series are driven with a regulated current set by the external resistor

R1. LED currents up to 40 mA can be supported over a wide range of

input supply voltages up to 5.5 V, making the device ideal for battery

−powered applications. The CAT4238 high−voltage output stage is

perfect for driving mid−size and large panel displays containing up to

ten white LEDs in series.

LED dimming can be done by using a DC voltage, a logic signal, or

a pulse width modulation (PWM) signal. The shutdown input pin

allows the device to be placed in power−down mode with “zero”

quiescent current.

In addition to thermal protection and overload current limiting, the

device also enters a very low power operating mode during “Open

LED” fault conditions. The device is housed in a low profile (1 mm

max height) 5−lead thin SOT23 package for space critical

applications.

Features

•Drives High Voltage LED Strings (38 V)

•Up to 87% Efficiency

•Low Quiescent Ground Current 0.6 mA

•Adjustable Output Current

•1 MHz Fixed Frequency Low Noise Operation

•Soft Start “In−rush” Current Limiting

•Shutdown Current Less than 1 mA

•Open LED Overvoltage Protection

•Automatic Shutdown at 1.9 V (UVLO)

•Thermal Overload Protection

•Thin SOT23 5−lead (1 mm Max Height)

•These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS

Compliant

Applications

•GPS Navigation Systems

•Portable Media Players

•Handheld Devices, Digital Cameras

•Portable Game Machines

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TSOT−23

TD SUFFIX

CASE 419AE

PIN CONNECTIONS

MUYM

MARKING DIAGRAM

Device Package Shipping

ORDERING INFORMATION

CAT4238TD−GT3 TSOT−23

(Pb−Free)

Green*

3,000/

Tape & Reel

MU = Specific Device Code

Y = Production Year (Last Digit)

M = Production Month

(1−9 (Jan−Sep), O, N, D (Oct−Dec))

(Top View)

VIN

SHDN

GND

* Lead Finish NiPdAu

HHRHH HRH/R www.0nsemi.com

CAT4238

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Figure 1. Typical Application Circuit

L: Sumida CDC5D23B−470

D: Central CMDSH05−4

C2: Taiyo Yuden UMK212BJ224 (rated 50 V)

VIN

CAT4238

15 W

20 mA

4.7 mF0.22 mF

GND

47 mH

OFF VFB = 300 mV

SHDN

VOUT

VIN

Table 1. ABSOLUTE MAXIMUM RATINGS

Parameters Ratings Units

VIN, FB voltage −0.3 to +7 V

SHDN voltage −0.3 to +7 V

SW voltage (Note 1) up to 60 V

Storage Temperature Range −65 to +160 _C

Junction Temperature Range −40 to +150 _C

Lead Temperature 300 _C

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality

should not be assumed, damage may occur and reliability may be affected.

1. The SW pin voltage is rated up to 39 V for external continuous DC voltage.

Table 2. RECOMMENDED OPERATING CONDITIONS

Parameters Range Units

VIN up to 5.5 V

SW pin voltage 0 to 38 V

Ambient Temperature Range −40 to +85 _C

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond

the Recommended Operating Ranges limits may affect device reliability.

NOTE: Typical application circuit with external components is shown above.

CAT4238

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Table 3. DC ELECTRICAL CHARACTERISTICS

(VIN = 3.6 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified))

Symbol Parameter Test Conditions Min Typ Max Units

IQOperating Current VFB = 0.2 V

VFB = 0.4 V (not switching) 0.6

0.1 1.5

0.6 mA

ISD Shutdown Current VSHDN = 0 V 0.1 1 mA

VFB FB Pin Voltage 10 LEDs with ILED = 20 mA 285 300 315 mV

IFB FB pin input leakage 1mA

ILED Programmed LED Current R1 = 10 W

R1 = 15 W

R1 = 20 W

28.5

14.25

31.5

15.75

VIH

VIL

SHDN Logic High

SHDN Logic Low Enable Threshold Level

Shutdown Threshold Level 0.4 0.8

0.7 1.5 V

FSW Switching Frequency 0.8 1.0 1.3 MHz

DC Maximum Duty Cycle VIN = 3 V 92 %

ILIM Switch Current Limit 350 450 600 mA

RSW Switch “On” Resistance ISW = 100 mA 1.0 2.0 W

ILEAK Switch Leakage Current Switch Off, VSW = 5 V 1 5 mA

Thermal Shutdown 150 °C

Thermal Hysteresis 20 °C

VUVLO Undervoltage Lockout (UVLO) Threshold 1.9 V

VOV-SW Overvoltage Detection Threshold 40 V

VOCL Output Voltage Clamp “Open LED” with VIN = 5 V 43 45 48 V

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.

Pin Description

VIN is the supply input for the internal logic. The device is

compatible with supply voltages down to 2.8 V and up to

5.5 V. It is recommended that a small bypass ceramic

capacitor (4.7 mF) be placed between the VIN and GND pins

near the device. If the supply voltage drops below 1.9 V, the

device stops switching.

SHDN is the shutdown logic input. When the pin is tied to

a voltage lower than 0.4 V, the device is in shutdown mode,

drawing nearly zero current. When the pin is connected to a

voltage higher than 1.5 V, the device is enabled.

GND is the ground reference pin. This pin should be

connected directly to the ground place on the PCB.

SW pin is connected to the drain of the internal CMOS

power switch of the boost converter. The inductor and the

Schottky diode anode should be connected to the SW pin.

Traces going to the SW pin should be as short as possible

with minimum loop area. An over-voltage detection circuit

is connected to the SW pin. When the voltage reaches 40 V,

the device enters a low power operating mode preventing the

SW voltage from exceeding the maximum rating.

FB feedback pin is regulated at 0.3 V. A resistor connected

between the FB pin and ground sets the LED current

according to the formula:

ILED +0.3 V

The lower LED cathode is connected to the FB pin.

Table 4. PIN DESCRIPTIONS

Pin # Name Function

1 SW Switch pin. This is the drain of the internal power switch.

2 GND Ground pin. Connect the pin to the ground plane.

3 FB Feedback pin. Connect to the last LED cathode.

4 SHDN Shutdown pin (Logic Low). Set high to enable the driver.

5 VIN Power Supply input.

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CAT4238

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Block Diagram

Enable

Current

Sense

300 mV

15 W

LED

Current

4.7 mF

Thermal

Shutdown

& UVLO

1 MHz

Oscillator Over Voltage

Protection

PWM &

Logic

Driver

0.22 mF

GND

47 mH

–

VIN

VIN VREF

SHDN

Figure 2. Block Diagram

Device Operation

The CAT4238 is a fixed frequency (1 MHz), low noise,

inductive boost converter that provides a constant current

with excellent line and load regulation. The device uses a

high-voltage CMOS power switch between the SW pin and

ground to energize the inductor. When the switch is turned

off, the stored energy in the inductor is released into the load

via the Schottky diode.

The on/off duty cycle of the power switch is internally

adjusted and controlled to maintain a constant regulated

voltage of 0.3 V across the feedback resistor connected to the

feedback pin (FB). The value of the resistor sets the LED

current accordingly (0.3 V/R1).

During the initial power-up stage, the duty cycle of the

internal power switch is limited to prevent excessive in-rush

currents and thereby provide a “soft-start” mode of

operation.

While operating from a Li−Ion battery, the device can

deliver 20 mA of load current into a string of up to 10 white

LEDs. For higher input voltages, the LED current can be

increased.

In the event of an “Open LED” fault condition, where the

feedback control loop becomes open, the output voltage will

continue to increase. Once this voltage exceeds 40 V, an

internal protection circuit will become active and place the

device into a very low power safe operating mode where

only a small amount of power is transferred to the output.

This is achieved by pulsing the switch once every 6 ms and

keeping it on for about 1 ms.

Thermal overload protection circuitry has been included

to prevent the device from operating at unsafe junction

temperatures above 150°C. In the event of a thermal

overload condition the device will automatically shutdown

and wait till the junction temperatures cools to 130°C before

normal operation is resumed.

Light Load Operation

Under light load condition (under 2 mA) and with input

voltage above 5.0 V, the CAT4238 driving 10 LEDs, the

driver starts pulse skipping. Although the LED current

remains well regulated, some lower frequency ripple may

appear.

Figure 3. Switching Waveform VIN = 5.0 V,

ILED = 1.5 mA

um; www.0nsemi.com

CAT4238

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TYPICAL CHARACTERISTICS

(VIN = 3.6 V, CIN = 4.7 mF, COUT = 0.22 mF, L = 47 mH with 10 LEDs at 20 mA, TAMB = 25°C, unless otherwise specified.)

Figure 4. Quiescent Current vs. VIN

(Not Switching) Figure 5. Quiescent Current vs. VIN

(Switching)

INPUT VOLTAGE (V) INPUT VOLTAGE (V)

5.55.04.54.03.53.0

100

125

150

5.04.54.03.53.0

0.5

1.0

1.5

2.0

Figure 6. FB Pin Voltage vs. Temperature Figure 7. FB Pin Voltage vs. Output Current

TEMPERATURE (°C) OUTPUT CURRENT (mA)

150100500−50

297

298

299

300

301

302

303

252015105

290

295

300

305

310

Figure 8. Switching Frequency vs. Supply

Voltage Figure 9. Switching Waveforms

INPUT VOLTAGE (V)

500 ns/div

5.04.5 5.54.03.53.0

0.8

0.9

1.0

1.1

1.2

QUIESCENT CURRENT (

QUIESCENT CURRENT (mA)

FB PIN VOLTAGE (mV)

SWITCHING FREQUENCY (MHz)

VFB = 0.4 V

20V/div

Inductor

Current

100mA/div

VOUT

AC coupled

500mV/div

10 LEDs

10 LEDs @15mA va:3.e\/\ SHDN SVIdW VOUT ZDVIdiV Input Current 1 DDmA/dwv 100us/div

CAT4238

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TYPICAL CHARACTERISTICS

(VIN = 3.6 V, CIN = 4.7 mF, COUT = 0.22 mF, L = 47 mH with 10 LEDs at 20 mA, TAMB = 25°C, unless otherwise specified.)

Figure 10. LED Current vs. Input Voltage Figure 11. LED Current Regulation (10 mA)

INPUT VOLTAGE (V) INPUT VOLTAGE (V)

5.04.54.03.53.0

5.55.04.54.03.53.0

−1.0

−0.5

0.5

1.0

Figure 12. Efficiency vs. Load Current

(10 LEDs) Figure 13. Efficiency vs. Input Voltage

(10 LEDs)

LED CURRENT (mA) INPUT VOLTAGE (V)

30252015105

100

5.54.54.03.53.0

100

Figure 14. Power−up with 10 LEDs at 20 mA Figure 15. Switch ON Resistance vs. Input

Voltage

INPUT VOLTAGE (V)

5.55.04.54.03.53.0

0.5

1.0

1.5

2.0

LED CURRENT (mA)

LED CURRENT VARIATION (%)

EFFICIENCY (%)

SWITCH RESISTANCE (W)

R1 = 20 W

VOUT = 32.5 V

VIN = 5 V

VIN = 3.6 V

10 LEDs @ 10 mA

5.5

R1 = 15 W

VOUT = 33 V

R1 = 10 W

VOUT = 33.8 V

5.0

VOUT = 32.5 V

10 LEDs @ 15 mA

VOUT = 33 V

10 LEDs @ 20 mA

725° 5)

CAT4238

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TYPICAL CHARACTERISTICS

(VIN = 3.6 V, CIN = 4.7 mF, COUT = 0.22 mF, L = 47 mH with 10 LEDs at 20 mA, TAMB = 25°C, unless otherwise specified.)

Figure 16. Maximum Output Current vs. Input

Voltage Figure 17. Shutdown Voltage vs. Input Voltage

INPUT VOLTAGE (V) INPUT VOLTAGE (V)

5.55.04.03.53.0

5.04.54.03.53.0

0.2

0.4

0.6

0.8

1.0

OUTPUT CURRENT (mA)

SHUTDOWN VOLTAGE (V)

VOUT = 35 V

−25°C

−40°C

85°C

125°C

4.5

Application Information

External Component Selection

Capacitors

The CAT4238 only requires small ceramic capacitors of

4.7 mF on the input and 0.22 mF on the output. Under normal

condition, a 4.7 mF input capacitor is sufficient. For

applications with higher output power, a larger input

capacitor of 10 mF may be appropriate. X5R and X7R

capacitor types are ideal due to their stability across

temperature range.

Inductor

A 47 mH inductor is recommended for most of the

CAT4238 applications. In cases where the efficiency is

critical, inductances with lower series resistance are

preferred. Inductors with current rating of 300 mA or higher

are recommended for most applications. Sumida

CDC5D23B−470 47 mH inductor has a rated current of

490 mA and a series resistance (D.C.R.) of 420 mW typical.

Schottky Diode

The current rating of the Schottky diode must exceed the

peak current flowing through it. The Schottky diode

performance is rated in terms of its forward voltage at a

given current. In order to achieve the best efficiency, this

forward voltage should be as low as possible. The response

time is also critical since the driver is operating at 1 MHz.

Central Semiconductor Schottky diode CMDSH05−4

(500 mA rated) is recommended for most applications.

LED Current Setting

The LED current is set by the external resistor R1

connected between the feedback pin (FB) and ground. The

formula below gives the relationship between the resistor

and the current:

R1+0.3 V

LED current

Table 5. RESISTOR R1 AND LED CURRENT

LED Current (mA) R1 (W)

5 60

10 30

15 20

20 15

25 12

30 10

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CAT4238

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Open LED Protection

In the event of an “Open LED” fault condition, the

CAT4238 will continue to boost the output voltage with

maximum power until the output voltage reaches

approximately 40 V. Once the output exceeds this level, the

internal circuitry immediately places the device into a very

low power mode where the total input power is limited to

about 6 mW (about 1.6 mA input current with a 3.6 V

supply). The SW pin clamps at a voltage below its maximum

rating of 60 V. There is no need to use an external zener diode

between Vout and the FB pin. A 50 V rated C2 capacitor is

required to prevent any overvoltage damage in the open

LED condition.

Figure 18. Open LED Protection without Zener

VIN

CAT4238

Schottky 100 V

(Central CMSH1−100)

15 W

4.7 mF0.22 mF

GND

OFF ON

47 mH

VIN

VOUT

SHDN VFB = 300 mV

Figure 19. Open LED Switching Waveforms without

Zener

2 ms/div

SW 10 V/div

Figure 20. Open LED Supply Current vs. VIN without

Zener

INPUT VOLTAGE (V)

5.04.54.03.53.0

2.0

1.0

4.0

5.0

SUPPLY CURRENT (mA)

5.5

3.0

Figure 21. Open LED Output Voltage vs. VIN without

Zener

INPUT VOLTAGE (V)

5.04.54.03.53.0

OUTPUT VOLTAGE (V)

5.5

.II— ,1 7 m 3.1 ks? S? i FT Figure 23. Circuit for Finered FWM Signal \ SHDN 5V/div VOUT 1 UV/div LED current 20mAldiv 200usec/div

CAT4238

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Dimming Control

There are several methods available to control the LED

brightness.

PWM Signal on the SHDN Pin

LED brightness dimming can be done by applying a PWM

signal to the SHDN input. The LED current is repetitively

turned on and off, so that the average current is proportional

to the duty cycle. A 100% duty cycle, with SHDN always

high, corresponds to the LEDs at nominal current. Figure 22

shows a 1 kHz signal with a 50% duty cycle applied to the

SHDN pin. The recommended PWM frequency range is

from 100 Hz to 2 kHz.

Figure 22. Switching Waveform with 1 kHz PWM on

SHDN

Filtered PWM Signal

A filtered PWM signal used as a variable DC voltage can

control the LED current. Figure 23 shows the PWM control

circuitry connected to the CAT4238 FB pin. The PWM

signal has a voltage swing of 0 V to 2.5 V. The LED current

can be dimmed within a range from 0 mA to 20 mA. The

PWM signal frequency can vary from very low frequency up

to 100 kHz.

Figure 23. Circuit for Filtered PWM Signal

1 kW

3.1 kW

0 V

2.5 V

0.22 mF

C1 i

VIN

CAT4238

GND

PWM

Signal LED

Current

3.73 kW

SHDN

15 W

VFB = 300 mV

A PWM signal at 0 V DC, or a 0% duty cycle, results in

a max LED current of about 22 mA. A PWM signal with a

93% duty cycle or more, results in an LED current of 0 mA.

Figure 24. Filtered PWM Dimming (0 V to 2.5 V)

LED CURRENT (mA)

00 10 20 30 40 50 60 70 80 90 100

PWM DUTY CYCLE (%)

VIN CAT4238 xxxxxxzxxz

CAT4238

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Board Layout

The CAT4238 is a high−frequency switching regulator.

The traces that carry the high−frequency switching current

have to be carefully layout on the board in order to minimize

EMI, ripple and noise in general. The thicker lines on

Figure 25 show the switching current path. All these traces

have to be short and wide enough to minimize the parasitic

inductance and resistance. The loop shown on Figure 25

corresponds to the current path when the CAT4238 internal

switch is closed. On Figure 26 is shown the current loop,

when the CAT4238 switch is open. Both loop areas should

be as small as possible.

Capacitor C1 has to be placed as close as possible to the

VIN pin and GND. The capacitor C2 has to be connected

separately to the top LED anode. A ground plane under the

CAT4238 allows for direct connection of the capacitors to

ground. The resistor R1 must be connected directly to the

GND pin of the CAT4238 and not shared with the switching

current loops and any other components.

Figure 25. Closed−switch Current Loop Figure 26. Open−switch Current Loop

Figure 27. Recommended PCB Layout

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CAT4238

Example of Ordering Information (Note 4)

Prefix Device # Suffix

Company ID

CAT 4238

Product Number

4238

T: Tape & Reel

3: 3,000 / Reel

Tape & Reel (Note 6)

(Optional)

Package

TD: Thin SOT−23 (Lead−free, Halogen−free)

− G

G: NiPdAu

Lead Finish

2. All packages are RoHS−compliant (Lead−free, Halogen−free).

3. The standard lead finish is NiPdAu.

4. The device used in the above example is a CAT4238TD−GT3 (TSOT−23, NiPdAu, Tape & Reel, 3,000/Reel).

5. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.

6. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

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TSOT−23, 5 LEAD

CASE 419AE−01

ISSUE O

DATE 19 DEC 2008

E1 E

TOP VIEW

SIDE VIEW END VIEW

LL2

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC MO-193.

SYMBOL

MIN NOM MAX

0º 8º

0.01

0.80

0.30

0.12

0.30

0.05

0.87

0.15

2.90 BSC

2.80 BSC

1.60 BSC

0.95 TYP

0.40

0.60 REF

0.25 BSC

1.00

0.10

0.90

0.45

0.20

0.50

MECHANICAL CASE OUTLINE

PACKAGE DIMENSIONS

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TSOT−23, 5 LEAD

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