ON Semiconductor NCP5010 Technical data

NCP5010

e

500 mW Boost Converter for
White LEDs

The NCP5010 is a fixed frequency PWM boost converter with
integrated rectification optimized for constant current applications
such as driving white LEDs. This device features small size, minimal
external components and high−efficiency for use in portable
applications and is capable of providing up to 500 mW output power
to 2−5 series connected white LEDs. A single resistor sets the LED
current and the CTRL pin can be pulse width modulated (PWM) to
reduce the LED Current.

The device includes True−Cutoff circuitry to disconnect the load
from the battery when the device is put into standby mode. To protect
the device, an output overvoltage protection, and short circuit
protection have been incorporated. The NCP5010 is housed in a low
profile, space efficient 1.7 x 1.7 mm Flip−Chip package. The device
has been optimized for use with small inductors and ceramic
capacitors.

Features

• 2.7 to 5.5 V Input Voltage Range

• Efficiency: 84% for 5 LED (V

4.2 V V

IN

• Low Noise 1 MHz PWM DC−DC Converter

• Open LED Protection and Short Circuit Protection

• Serial LEDs Architecture for Uniform Current Matching

• 1 mA Shutdown Current Facility with True−Cutoff

• Very Small 8−Pin Flip−Chip 1.7 x 1.7 mm Package

• This is a Pb−Free Device

T ypical Applications

• White LED Backlighting for Small Color LCD Displays

• Cellular Phones

• Digital Cameras

• MP3 Players

• High Efficiency Step−up Converter

= 3.5 V by LED) at 30 mA and

F

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

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MARKING
DIAGRAM

A1

8−Pin Flip−Chip

FC SUFFIX

1

See detailed ordering and shipping information in the packag
dimensions section on page 16 of this data sheet.

V

= 5 LED (18 V)

OUT

0

1 10 100

Figure 1. Efficiency vs. Output Current

CASE 499AJ

DAX = Specific Device Code
G = Pb−Free Package
A = Assembly Location
Y = Year
WW = Work Week

PIN CONNECTIONS

A1

A2 A3

AGND

CTRL NC

B1 B3

V

IN

C1 C2 C3

V

ORDERING INFORMATION

OUT

I

OUT

SW PGND

Top View

V

= 3 LED (11 V)

OUT

(mA)

DAXG

AYWW

FB

VIN = 4.2 V

© Semiconductor Components Industries, LLC, 2007

March, 2007 − Rev. 2

1 Publication Order Number:

NCP5010/D

V

bat

2.7 to 5.5 V

NCP5010

C

in

4.7 mF 0603

L1
22 mH

LED

X5R 6.3V

C2

IN

SW

ENABLE

A2

CTRL

A3

NC

NCP5010

V

AGND

A1 B1

V

PGND

C3

OUT

B3

FB

C1

C

out

1 mF 0805

X5R 25V

R
24

LED

fb

2 to 5 LEDs

Figure 2. Typical Application Circuit

PIN FUNCTION DESCRIPTION

PIN PIN NAME TYPE DESCRIPTION

A1 AGND POWER System ground for the analog circuitry . A high quality ground must be provided to avoid spikes and/

B1 V

C1 V

IN

OUT

POWER Power Supply Input. A ceramic capacitor with a minimum value of 1 mF/6.3 V (X5R or X7R) must be

POWER DC−DC converter output. This pin should be directly connected to the load and a low ESR

A2 CTRL INPUT An Active High logic level on this pin enables the device. A built−in pulldown resistor disables the

C2 SW POWER Power switch connection for inductor. T ypical application will use a coil from 10 mH to 22 mH and

A3 NC N/A Not Connected
B3 FB INPUT Feedback voltage input used to close the loop by means of a sense resistor connected between the

C3 PGND POWER Power ground. A high quality ground must be used to avoid spikes and/or uncontrolled operation.

or uncontrolled operations. This pin is to be connected to the PGND pin.

connected to this pin. This capacitor should be placed as close as possible to this pin. In addition,
one end of the external inductor is to be connected at this point.

(<30 mW) 1 mF (min) 25 V bypass capacitor. This capacitor is required to smooth the current flowing
into the load, thus limiting the noise created by the fast transients present in this circuit. Since this is
a current regulated output, this pin has over voltage protection to protect from open load conditions.
Care must be taken to avoid EMI through the PCB copper tracks connected to this pin.

device if the pin is left open. This pin can also be used to control the average current into the load
by applying a low frequency PWM signal. If a PWM signal is applied, the frequency should be high
enough to avoid optical flicker but be no greater than 1 kHz.

must be able to handle at least 350 mA. If the desired output power is above 300 mW, the inductor
should have a DCR < 1.4 W.

primary LED branch and the ground. The output current tolerance is depends upon the accuracy of
this resistor and a ±5% or better accuracy metal film resistor is recommended. An analog dimming
signal can be applied to this point to reduce the output current. Please refer to the application
section for additional details.

Care must be taken to avoid high−density current flow in a limited PCB copper track. This pin is to
be connected to the AGND pin.

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2

NCP5010

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage (Note 2) V
Over Voltage Protection V

IN

OUT

Human Body Model (HBM) ESD Rating (Note 3) ESD HBM 2000 V
Machine Model (MM) ESD Rating (Note 3) ESD MM 200 V
Digital Input Voltage

CTRL −0.3 < VIN < V

Digital Input Current
Power Dissipation @ TA = +85 °C P
Thermal Resistance Junction−to−Air

D

R

q

JA

8−Pin Flip−Chip Package
Operating Ambient Temperature Range T
Operating Junction Temperature Range T
Storage Temperature Range T

A

J

stg

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.

1. Maximum electrical ratings are defined as those values beyond which damage to the device may occur at TA = 25°C.

2. According to JEDEC standard JESD22−A108B.

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

4. Latchup Current Maximum Rating: ±100 mA per JEDEC standard: JESD78.

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

6. For the 8−Pin Flip−Chip CSP Package, the R
50 mm total area and also 135°C/W with 500 mm. All the bumps have the same thermal resistance and need to be connected thereby optimizing

is highly dependent on the PCB Heatsink area. For example R

q

JA

the power dissipation.

7.0 V
24 V

+0.3

bat

1.0

mA

150 mW

°C/W

(Note 6)

−40 to +85 °C

−40 to +125 °C

−65 to +150 °C

can be to 195°C/W with

q

JA

V

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3

NCP5010

ELECTRICAL CHARACTERISTICS (Limits apply for T

between −40°C to +85°C and VIN = 3.6 V , unless otherwise noted)

A

Pin Symbol Rating Min Typ Max Unit

B1 V
C2 I

IN

PEAK_MAX

NMOS R
F

OSC

M

DUTY

E

FF

C1 OVP
C1 OVP
C1 P

C1 I

B3 F

C1 F

OUT

OUT

BV

BVLR

DS(on)

ON
H

Supply Voltage 2.7 5.5 V
Switch Current Limit 280 420 560 mA
Internal Switch On Resistor 0.6 1.0 W
PWM Oscillator Frequency 0.8 1.0 1.2 MHz
Maximum Duty Cycle 91 95 %
Efficiency (Note 7) 84 %
Overvoltage Clamp Voltage 20 22 V
Overvoltage Clamp Hysteresis 1.0 V
Output power (Note 8)

VIN = 3.1 V
VIN < 3.1 V

Minimum Output Current Controlled No Skip Mode

500
300

1.0 mA

(Note 9)
Feedback Voltage Threshold in Steady State

Overtemperature range
At 25°C

475
490

500
500

525
510

Feedback Voltage Line Regulation (Notes 9 and 10)

From DC to 100 Hz 0.2 0.5

B1 U

B1 U
C1 I
B1 S

VLO

VLOH

OUTSC

CPT

B1C2ISTDB Stand by Current, I

I

Q

A2 V
A2 V
A2 R

IL
IH
CTRL

7. Efficiency is defined by 100 * (P
VIN = 4.2 V with L= Coilcraft DT1608C−223
I

= 30 mA, Load = 5 LEDs (VF = 3.5 V per LED) bypassed by 1 mF X5R

OUT

VIN Undervoltage Lockout measured at 25°C

Threshold to Enable the Converter
Threshold to Disable the Converter

2.2

2.0

2.4

2.2

2.6

2.4
Undervoltage Lockout Hysteresis 200 mV
Short Circuit Output Current 20 mA
Short Circuit Protection Threshold

Detected
Released

V

bat

= 4.2 V

= 0 mA, CTRL = Low

OUT

35
47

50
67

65
87

2.0 mA

Quiescent Current

Device Not Switching (BF = VIN)
Device Switching (RFB disconnected)

0.4

1.0
Voltage Input Logic Low 0.3 V
Voltage Input Logic High 1.2 V
CTRL Pin Pulldown Resistance 175 370 kW

/ Pin) at 25°C

out

8. Guaranteed by design and characterized with L = 22 mH, DCR = 0.7 W max.

9. Load = 4 LEDs (VF = 3.5 V by LED), C

10.VIN = 3.6 V , Ripple = 0.2 V P−P, I

OUT

= 1 mF X5R, L= Coilcraft DT1608C−223.

OUT

= 15 mA.

mW

mV

%/V

V

% of V

mA

IN

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4

NCP5010

)

TYPICAL OPERATING CHARACTERISTICS

0

0

0

Condition: Efficiency = 100 x (Number of LED stacked x V

90

80

70

EFFICIENCY (%)

60

50

010203040506070

VIN = 2.7 V

I

OUT

VIN = 3.3 V

VIN = 4.2 V

(mA)

Figure 3. Efficiency vs. Current @ 3 LEDS (10.5 V)

L = Coilcraft DT1608C−223

90

80

x I

LED

90

80

70

EFFICIENCY (%)

60

50

0 1020304050607

)/P

LED

IN

VIN = 2.7 V

I

(mA)

OUT

VIN = 3.3 V

VIN = 4.2 V

Figure 4. Efficiency vs. Current @ 3 LEDS (10.5 V)

L = TDK VLF4012AT−220

90

80

VIN = 2.7 V

70

EFFICIENCY (%)

60

50

0 10203040506070

VIN = 3.3 V

I

(mA)

OUT

VIN = 4.2 V

Figure 5. Efficiency vs. Current @ 4 LEDS (14 V)

L = Coilcraft DT1608C−223

90

80

VIN = 2.7 V

70

EFFICIENCY (%)

60

VIN = 3.3 V

VIN = 4.2 V

70

EFFICIENCY (%)

60

50

0 1020304050607

VIN = 2.7 V

VIN = 3.3 V

I

(mA)

OUT

VIN = 4.2 V

Figure 6. Efficiency vs. Current @ 4 LEDS (14 V)

L = TDK VLF4012AT−220

90

80

70

EFFICIENCY (%)

60

VIN = 2.7 V

VIN = 3.3 V

VIN = 4.2 V

50

0 10203040506070

I

(mA)

OUT

Figure 7. Efficiency vs. Current @ 5 LEDS (17.5 V)

L = Coilcraft DT1608C−223

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50

0 1020304050607

I

(mA)

OUT

Figure 8. Efficiency vs. Current @ 5 LEDS (17.5 V

L = TDK VLF4012AT−220

5

NCP5010

0

TYPICAL OPERATING CHARACTERISTICS

.5

00

Condition: Efficiency = 100 x (Number of LED stacked x V

90

I

= 33 mA

OUT

80

I

= 10 mA

70

I

OUT

= 23 mA

OUT

60

50

EFFICIENCY (%)

40

I

OUT

= 1 mA

30

20

2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)

Figure 9. Efficiency vs. VIN @ 3 LEDS (10.5 V)

L = Coilcraft DT1608C−223

90

80

70

I

OUT

= 28 mA

I

OUT

= 23 mA

I

OUT

= 10 mA

x I

LED

)/P

IN

LED

90

I

= 33 mA

OUT

80

70

I

OUT

= 23 mA

I

OUT

60

50

EFFICIENCY (%)

40

I

OUT

30

20

2.5 3.0 3.5 4.0 4.5 5.0 5
VIN (V)

Figure 10. Efficiency vs. VIN @ 4 LEDS (14 V)

L = Coilcraft DT1608C−223

510

505

VIN = 3.6 V

= 10 mA

= 1 mA

60

I

50

EFFICIENCY (%)

40

OUT

= 1 mA

30

20

2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)

Figure 11. Efficiency vs. V

@ 5 LEDS (17.5 V)

IN

L = Coilcraft DT1608C−223

1.04

VIN = 3.6 V

1.02

1.00

FREQUENCY (MHz)

0.98
VIN = 2.7 V

VIN = 5.5 V

VIN = 5.5 V

500

VIN = 2.7 V

495

FEEDBACK VOLTAGE (mV)

490

−40 −20 0 20 40 60 80 10
TEMPERATURE (°C)

Figure 12. Feedback Voltage vs. Temperature

900

800

700

(mW)

DS(on)

600

500

NMOS R

400

VIN = 3.6 V

VIN = 2.7 V

VIN = 5.5 V

0.96

−40 −20 0 20 40 60 80 100

300

−40 −20 0 20 40 60 80 1

TEMPERATURE (°C)

Figure 13. Oscillator Frequency vs. Temperature Figure 14. NMOS R

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TEMPERATURE (°C)

vs. Temperature

DS(on)