Datasheet XZ5121B005M, XZ5121B006M, XZ5121B007M, XZ5121B008M, XZ5121B009M Datasheet [ru]

STEP-UP DC/DC CONVERTER —BACKLIGHT DRIVER XZ5121 SERIES

■

DESCRIPTION

The XZ5121 Series is a fixed frequency, constant current step-up DC/DC converter ideal for driving
LEDs used in backlighting applications on cellular phones, PDAs and digital cameras etc. Output voltage
of up to 17.5V can be derived, and from a 3.2V input four white Led’s cab be driven in series or

alternatively, using a 2.5V input, a network of two parallel legs with three in each may be driven.

Luminance of the LED’s is controlled by changing the duty cycle of a PWM signal applied to the
CE pin.

In addition, an internal MOSFET with an Rds-on of 2Ω is used. Allow profile and small board area solution

can be achieved using a chip coil and an ultra small ceramic output capacitor (CL) of 0.22uF.

■

FEATURES

l

input voltage range : 2.5V—6V

l

Output voltage range : up to 17.5V externally set-up reference voltage 0.2V±5%

l Oscillation frequency : 1.0MHZ±20% :
l

l

Efficiency : 88%(When driving 3 white LEDs in series VIN=3.6V ILED=20mA)

l

Control : PWM control

l

Stand-by Current : ISTB=1.0uA(MAX)

l

Load capacitor : 0.22uF,ceramic

l

Lx limit Current :300mA

■ APPLICATIONS

On resistance :

2.0Ω

l

For White LED Drivers

l

Mobil phones, PHS

l

PDAs

l

Digital still cameras

■

PACKAGE

SOT23—6

■

BLOCK DIAGRAM

Figure 1

1

STEP-UP DC/DC CONVERTER —BACKLIGHT DRIVER XZ5121SERIES

■ ABSOLUTE MAXIMUM RATINGS

Item

Symbol

VIN Pin Voltage

OUT Pin Voltage

LX Pin Voltage
FB Pin Voltage
CE Pin Voltage

OVP Pin Voltage

LX Pin Current

Power Dissipation

PD

Operating Temperature range

Storage Temperature range

Caution The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded under any conditions.

■ Electrical Characteristics

Item Symbol

FB Control Voltage（*1）

Output Voltage range

Lx Operating Voltage

range

Operating Voltage

range

VFB

VOUT

VLX

VIN

(Ta=25°C,except specify)

Condtion

-

-

VIN

VOUT

VLX
Vfb
Vce

Vovp

ILX

SOT23-6 250

Topr
Tstg

Vfbt*0.95

Absolute maximum ratings
Vss-0.3～Vss+7
Vss-0.3～Vss+7
Vss-0.3～Vss+22
Vss-0.3～Vss+7
Vss-0.3～Vss+7
Vss-0.3～Vss+22
1000

-40～＋85

-55～＋125

Min.

VIN

-

2.5

Typ.

Vfbt Vfbt*1.05

-

-

-

20．0

Max.

17.5

6

Unit

V

Unit

V

V
V

mA
mW

℃

Circuits

1

Stand-by Current

Supply Current 1

Supply Current 2

Oscillation Frequency

Maximum Duty Cycle

Efficiency

ISTB

IDD1

IDD2

FOSC

MAXDTY

EFFI VIN=3.6V;RLED=20Ω

VCE=0V、VLX=5V

VIN=VLX、VFB=0.4V

VCONT=0.4V

－

－

0.8

86

－

2

550

65

1.0

92

88

1.2

98

－

1

⌡

⌡

MHz

%

％

A

A

3

2

3

2

2

1

STEP-UP DC/DC CONVERTER —BACKLIGHT DRIVER XZ5121 SERIES

Current Limit

LX Overvoltage Limit

LX On Resistance

LX Leak Current

CE ‘H’ Voltage

CE ‘L’ Voltage

CE ‘H’ Current

CE ‘L’ Current

FB ’H’ Current

ILIM

LXOVL

ILXL

VCEH

VCEL

ICEH

ICEL

ICEH

VIN=3.6

VIN=3.6V、VLX=0.4V

18.0

0.65

VIN=VLX、VFB=0.4V

VIN=VLX、VFB=0.4V

VIN=VLX、VFB=0.4V

300

19.0

2.0

0

0.2

0.1

-0.1

0.1

1

mA

Ω

⌡

⌡

⌡

⌡

4

V

A

V

V

A

A

A

2

2

3

2

2

3

3

3

FB ’L’ Current

ICEL

VIN=VLX、VFB=0.4V

-0.1

⌡

A

(*1) Vfbt may take between 0.01V-1.49V certain value, now a major center value

0.01V,

0.2V,0.23V,0.25V;

■ TEST CIRCUITS

Figure 2

Figure 3

3

3

STEP-UP DC/DC CONVERTER —BACKLIGHT DRIVER XZ5121SERIES

Figure 4

Figure 5

Caution the value of the resistance named RLED: RLED=VFB/ILED;VFB is the voltage 0f the FB

pin; ILED is the current of LED and equal to 20mA usually;

■ TYPICAL APPLICATION CIRCUIT

图 6

Caution the value of the resistance named RLED: RLED=VFB/ILED;VFB is the voltage 0f the FB

pin; ILED is the current of LED and equal to 20mA usually;

4

STEP-UP DC/DC CONVERTER —BACKLIGHT DRIVER XZ5121SERIES

■ TYPICAL PERFORMANCE CHARACTERISTICS

■ Pin Configuration

5

STEP-UP DC/DC CONVERTER —BACKLIGHT DRIVER XZ5121 SERIES

■ Pin Assignment

Pin Number Pin Name Function
1 LX SWITCH
2 VSS Ground
3 FB Voltage Feedback
4 CE Chip Enable
5 OVP Over voltage protect
6 VIN Power Input

■ ORDERING INFORMATION

XZ5121○

Item

1

○

○2○3○

1○2○3○4○5○6

4

Symbol

B

010-149

Function

Denotes Lx Overvoltage Limit: Yes
Denotes Oscillation Frequency:1MHZ

Denotes FB Voltage

eg：○2 =0 ○3 =2 ○4 =0 0.20V

2

○

=1 ○3 =2 ○4 =3 1.23V

5

○

6

○

■ MARKING

1

○

Represents the product name

Symbol
Z

Represents the type of regulator

2

○

Symbol Vfb(V)
S 0.050-0.195
L 0.20-0.49
H 1.20-1.49

Part Number
XZ5121****M*

M

Embossed Tape :Standard Feed

R

Embossed Tape :Reverse Feed

L

Part Number
XZ5121B***M*
XZ5121B***M*
XZ5121B***M*

6

Denotes Package Type : SOT23-6

STEP-UP DC/DC CONVERTER —BACKLIGHT DRIVER XZ5121 SERIES

3

○

Represents the voltage of FB pin

Symbol
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E

4 Represents the assembly lot no.

○

0.20

0.21

0.22

0.23

0.24

0.25

0.26

0.27

0.28

0.29

0.30

0.31

0.32

0.33

0.34

Vfb(V)

0.050

0.055

0.060

0.065

0.070

0.075

0.080

0.085

0.090

0.095

0.100

0.105

0.110

0.115

0.120

1.20

1.21

1.22

1.23

1.24

1.25

1.26

1.27

1.28

1.29

1.30

1.31

1.32

1.33

1.34

Symbol
F
H
K
L
M
N
P
R
S
T
U
V
X
Y
Z

0.35

0.36

0.37

0.38

0.39

0.40

0.41

0.42

0.43

0.44

0.45

0.46

0.47

0.48

0.49

Vfb(V)

0.125

0.130

0.135

0.140

0.145

0.150

0.155

0.160

0.165

0.170

0.175

0.180

0.185

0.190

0.195

1.35

1.36

1.37

1.38

1.39

1.40

1.41

1.42

1.43

1.44

1.45

1.46

1.47

1.48

1.49

0～9，A～Z ,Reverts 0～9，A～Z repeated (G,I,J,O,Q,W expected)

■ PACKAGING INFORMATION

7