ON Semiconductor NCP5612 Technical data

NCP5612

High Efficiency Ultra Small Thinnest White LED Driver

The NCP5612 product is a dual output LED driver dedicated to the

LCD display backlighting.

The built−in DC/DC converter is based on a high efficient charge pump structure with operating mode 1x and 1.5x. It provides a peak 87% efficiency together with a 0.2% LED to LED matching.

Features

• Support the Single Wire Serial Link Protocol

• Peak Efficiency 90% with 1x and 1.5x Mode

• Programmable Dimming ICON Function

• Built−in Short Circuit Protection

• Provides 16 steps Current Control

• Controlled Start−up Inrush Current

• Built−in Automatic Open Load Protection

• Tight 0.2% Matching Tolerance

• Accurate 1% Output Current Tolerance

• Smallest Available Package on the Market

• This is a Pb−Free Device

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MARKING DIAGRAM

LLGA12 (2x2 mm)

MU SUFFIX

CASE 513AA

YD = Specific Device Code M = Date Code G = Pb−Free Package

(Note: Microdot may be in either location)

YD M G

PIN CONNECTIONS

T ypical Applications

• Portable Back Light

• Digital Cellular Phone Camera Photo Flash

• LCD and Key Board Simultaneous Drive

1 mF/6.3 V 1 mF/6.3 V

GND

CC−cpu

I/O pin

MCU

GND

Figure 1. Typical Single Wire White LED Driver

10k

bat

220 nF/10 V

C1N

bat

CNTL I

REF

GND

C1P

NCP5612

5 4

220 nF/10 V

C2N

LED/ICON

8 C2P

out

LED1

1 mF/10 V

LWY87S

GND

LWY87S

GND C1N

bat

C1P C2N

C2P

OUT

LED1

2 12 11 3

LED2

REF

CNTL

(Top View)

ORDERING INFORMATION

Device Package Shipping†

NCP5612MUTBG LLGA12

(Pb−Free)

†For information on tape and reel specifications,

including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D.

3000/Tape & Ree

August, 2006 − Rev. 0

1 Publication Order Number:

NCP5612/D

NCP5612

1 mF/6.3 V

GND

CNTL

150 k

bat

DIGITAL CONTROL

bat

GND

220 nF 220 nF

12 10

CHARGE PUMP

DC/DC CONVERTER

bat

9 8

OVERVOLTAGE

LWY87S

1 mF/10 V

GND

out

LWY87S

GND

10 k

GND

ANALOG CONTROL

OVERTEMPERATURE

CURRENT MIRRORS

GND

Figure 2. Simplified Block Diagram

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NCP5612

PIN FUNCTION DESCRIPTION

Pin No. Symbol Function Description

1 GND POWER This pin is the GROUND signal for the power analog blocks and must be

2 LED1 INPUT, POWER This pin sinks to ground and monitors the current flowing into the first LED,

3 LED2 INPUT, POWER This pin sinks to ground and monitors the current flowing into the second LED,

4 I

REF

INPUT, ANALOG This pin provides the reference current, based on the internal band−gap

5 CNTL INPUT, DIGITAL This pin supports the flow of data between the external MCU and the

6 NC − No internal connection 7 V

OUT

OUTPUT, POWER This pin provides the output voltage supplied by the DC/DC converter. The

8 C2P POWER One side of the external charge pump capacitor (C

9 C2N POWER One side of the external charge pump capacitor (C

10 C1P POWER One side of the external charge pump capacitor (C

11 V

BAT

INPUT, POWER Input Battery voltage to supply the analog and digital blocks. The pin must be

12 C1N POWER One side of the external charge pump capacitor (C

1. Using low ESR ceramic capacitor, 50 mW maximum, is mandatory to optimize the Charge Pump ef ficiency.

2. Total DC/DC output current is limited to 60 mA.

connected to the system ground. This pin is the GROUND reference for the DC/DC converter and the output current control. The pin must be connected to the system ground, a ground plane being strongly recommended.

intended to be used in backlight application. The current is limited to 30 mA maximum (Note 2). The LED1 is deactivated when the ICON bit of the LED−REG register is High. The LED1 is automatically disconnected when an open load is sensed pin 2 during the operation.

intended to be used in backlight application. The current is limited to 30 mA maximum (Note 2). The LED2 fulfills the ICON function, LED1 being deactivated, when the ICON bit of the LED−REG register is High. The LED2 is automatically disconnected when an open load is sensed pin 3 during the operation.

voltage reference, to control the output current flowing in the LED. A 1% tolerance, or better, resistor shall be used to get the highest accuracy of the LED biases. An external current source can be used to bias this pin to dim the light coming out of the LED. In no case shall the voltage at pin 4 be forced either higher or lower than the 600 mV provided by the internal reference.

NCP5612 internal registers. The protocol makes profit of a Single Wire structure associated to a Serial 8 bits format data flow.

pin must be decoupled to ground by a 1 mF ceramic capacitor located as

out

close as possible to the pin. Cares must be observed to minimize the parasitic inductance at this pin. The circuit shall not operate without such bypass capacitor connected across the V

pin and ground.

out

The output voltage is internally clamped to 5.5 V maximum in the event of no load situation. On the other hand, the output current is limited to 40 mA (typical) in the event of a short circuit to ground.

) is connected to this

FLY

pin, associated with C2N (Note 1)

) is connected to this

FLY

pin, associated with C2P (Note 1)

) is connected to this

FLY

pin, associated with C1N (Note 1)

decoupled to ground by a 1.0 mF minimum ceramic capacitor.

) is connected to this

FLY

pin, associated with C1P (Note 1)

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NCP5612

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply V

BAT

Output Power Supply Vout 7.0 V Digital Input Voltage

CNTL −0.3 < V < V

Digital Input Current Human Body Model: R = 1500 W, C = 100 pF (Note 3)

ESD 2.0

Machine Model LLGA12 Package

Power Dissipation @ TA = +85°C (Note 4) Thermal Resistance, Junction−to−Case

Thermal Resistance, Junction−to−Air Operating Ambient Temperature Range T Operating Junction Temperature Range T Maximum Junction Temperature T Storage Temperature Range T

JA A J

Jmax

stg

Latch−up Current Maximum Rating per JEDEC Standard: JESD78 − "100 mA

Moisture Sensitivity (Note 5) − 1

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

3. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) "2.0 kV per JEDEC standard: JESD22−A114. Machine Model (MM) "200 V per JEDEC standard: JESD22−A115.

4. The maximum package power dissipation limit must not be exceeded.

5. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020A.

7.0 V

BAT

1.0

200

°C/W °C/W

−40 to +85 °C

−40 to +125 °C +150 °C

−65 to +150 °C

POWER SUPPLY SECTION (Typical values are referenced to T

temperature, operating conditions 2.85 V < V

< 5.5 V , unless otherwise noted.)

bat

= +25°C, Min & Max values are referenced −40°C to +85°C ambient

Rating Pin Symbol Min Typ Max Unit

Power Supply 11 V Continuous DC Current in the Load @ Vf = 3.8 V , 3.2 V < V

< 5.5 V , ICON = L

bat

7 I

(30 mA per LED)

Output ICON Current (ICON bit = H) @ 3.2 V < V

< 4.2 V , TA = +25°C 7 I

bat

Continuous Output Short Circuit Current 7 I Output Voltage Compliance (OVP) 7 V DC/DC Start Time (C

operation, @ V

Output Voltage T urn−off ( C

= 5%

out

Standby Current, 0°C < TA < +85°C

= 3.6 V , I

bat

out

Operating Current, @ I Output LED to LED Current Matching, V

= 10 mA, LED1 & LED2 are Identical −25°C < TA < 85°C

LED

Output Current Tolerance @ V

= 1.0 mF) from end of the CNTL T

out

= 3.6 V

bat

= 1 mF) From Last Low Level at CNTL pin to

out

= 0 mA, ICON = L

= 0 mA, ICON = H, V

out

bat

= 3.6 V , I

bat

delay to full load

dst

12 T

11 I

= 3.6 V 11 I

bat

= 3.6 V ,

= 10 mA −25°C < Ta < 85°C 2, 3 I

LED

2, 3 I

Charge Pump Operating Frequency − F Thermal Shutdown Protection − T Thermal Shutdown Protection Hysteresis − T Efficiency − LED1 = LED2 = 10 mA, Vf = 3.2 V , V

Efficiency − LED1 = LED2 = 30 mA, Vf = 3.75 V , V

= 3.8 V (Total = 20 mA)

bat

= 3.8 V (Total = 60 mA)

bat

−

bat

out

ICONTOL

sch

out

start

off

stdb

MAT

TOL

pwr

SDH

PWR

2.7 − 5.5 V mA

60 − −

− 450 550 mA

− 40 100 mA

4.8 − 5.7 V

− 150 − ms

− 500 − ms

− − 1.0 mA

− 600 − mA

− "0.2 "1.0 %

− "1.0 − %

− 1.0 − MHz

− 160 − °C

− 30 − °C

−

87 84

−

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