TB62737FUG
TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic
TB62737FUG
Step Up Type DC/DC Converter for White LED
Features
The TB62737FUG is a high efficient Step-Up Type DC/DC Converter specially
designed for constant current driving of White LED.
This IC can drive 2-6 white LEDs connected series using a Li-ion battery.
This IC contains N-ch MOS-FET Transistor for Coil-Switching, and LED Current
(I
F
) is set with an external resistor.
This IC is especially for driving back light white LEDs in LCD of PDA, Cellular
Phone, or Handy Terminal Equipment.
Characteristics
•
Brightness Control Function with changing drive current :
LED Current I
F
= 25% to 100% (Analog Input to SHDN terminal)
For the control in range of 25% or less, refer 7-page.
•
•
•
•
•
•
•
Maximum output voltage : V
o
= 24 V
Can drive 2-6 white LEDs connected series (Typ. 4LEDs)
Variable LED Current I
F
is set with a external resistor :
20 mA (Typ.) @RSENS = 16
Ω
Output Power : Available for 480mW LED loading
High Efficiency : 87% @Maximum (Using recommended external parts: Typ. 4LEDs)
Output Over Voltage Shutdown Function :
Switching Operation is shut downed when OVD terminal Voltage is over 19 V (typ.).
IC Package : SOT23-6
Switching Frequency : 1.1 MHz (Typ.)
Weight: 0.016 g (Typ.)
Pin Assignment
(Top view)
SHDN
FB
Ｎ
OVD
GND
VIN
SW
Caution 1:
This IC could be destroyed in some case if amounted in 180° inverse direction.
Please be careful about IC direction in mounting.
Company Headquarters
3 Northway Lane North
Latham,
New York
12110
Toll Free: 800.984.5337
Fax:
518.785.4725
Web: www.marktechopto.com | Email: info@marktechopto.com
California Sales Office:
950 South Coast Drive, Suite 225
Costa Mesa, California 92626
Toll Free: 800.984.5337
Fax: 714.850.9314
TB62737FUG
Block Diagram
4
3
VIN
Over Volt.
Detection
Reference
Mono Multi
TSD
Level
Detect
Error
AMP.
1
SHDN
GND
CTL
AMP.
5
6
FB
Off Time
Control
Mono Multi
CTL
AMP.
SW
2
OVD
Pin Function
Pin No.
Symbol
SHDN
1
Function Description
Voltage-Input Terminal for IC-Enable / Setting LED-I
F
.
0V to 0.5V : Shutdown (PS) Mode, IC operation is disabled.
1.0V to 2.5V : I
F
= 25% to 100%
Over 2.5V : I
F
= 100%
I
F
adjustment with PWM input signal is also available.
Over Voltage Detection Terminal.
2
3
4
5
6
OVD
VIN
SW
GND
FB
IC Switching Operation is disabled with detection over voltage.
If the voltage returns to detection level or less, Operation is enabled again.
Supply Voltage Input Terminal. ( 2.8V to 5.5V)
Switch Terminal for DC/DC Converter. Nch MOSFET Built-In.
Ground Terminal.
LED I
F
Setting Resister Connecting Terminal.
1
2005-04-14
TB62737FUG
Absolute Maximum Ratings (Topr = 25°C if without notice)
Characteristics
Power Supply Voltage
Input Voltage
Switching Terminal Voltage
Switching Terminal Current
Power Dissipation
Symbol
V
IN
V
SHDN
V
o
(SW)
I
o
(SW)
P
D
R
th (j-a)
T
opr
T
stg
T
j
Ratings
−0.3
to
+6.0
−0.3
to
+V
IN
+
0.3
-0.3 to 24
380
0.41 (Device)
0.47 (on PCB) Caution 2
300 (Device)
260 (on PCB)
−40
to
+85
−55
to
+150
150
Unit
V
V
V
mA
W
Thermal Resistance
Operation Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Caution 2:
°C/W
°C
°C
°C
Power Dissipation must be calculated with subtraction of 3.8 mW/°C from Maximum Rating
with every 1°C if T
opr
is upper 25°C. (on PCB)
Recommended Operating Condition
(Ta
=
-40°C to 85°C if without notice)
Characteristics
Power Supply Voltage
SHDN terminal
'H' level input voltage
SHDN terminal 'L' level input
voltage
SHDN terminal
input Pulse Width
LED Current
(Average Value)
Symbol
V
IN
V
SHDNH
V
SHDNL
t
pw
I
o1
Test
Circuit
-
-
-
-
-
ON duty width
OFF duty width
V
IN
=
3.6 V, R
SENS
=16Ω
4LEDs, T
opr
= 25
°
C
Test Condition
Min
2.8
2.5
0
33
-
Typ
-
-
-
-
20
Max
5.5
V
IN
0.5
-
-
Unit
V
V
V
µs
mA
2
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TB62737FUG
Electrical Characteristics
Characteristics
Input Voltage Range
Operating Consumption Current
Quiescent Consumption Current
SHDN Terminal Current
Integrated MOS-Tr
Switching Frequency
SW Terminal
Protection Voltage
Switching Terminal Current
Switching Terminal
Leakage Current
FB Terminal Feedback Voltage
(VFB)
FB Terminal Line Regulation
OVD Terminal Voltage
OVD Terminal Leakage Current
(Ta
=
-40°C to 85°C if without notice)
Symbol
V
IN
I
IN
(On)
I
IN
(Off)
I
SHDN
f
OSC
V
o
(SW)
I
oZ
(SW)
I
oz
(SW)
V
FB
∆V
FB
V
OVD
I
OVDZ
VIN=3.6V, RSENS=16Ω
VIN=3.6V,V
SHDN
=0V
VIN=3.6V,V
SHDN
=3.6V
VIN=3.6V,V
SHDN
=3.6V
-
-
-
V
IN
=3.6V, RSENS=16Ω
T
opr
=25
°
C, L=6.8µH
V
IN
=3.6V center
V
IN
=3.0 to 5.0V
-
V
OVD
=16V
Test Condition
Min
2.8
-
-
-10
0.77
-
-
-
308
-5
19
-
Typ
-
0.9
0.5
0
1.1
25
400
0.5
325
-
22
0.5
Max
5.5
1.5
1.0
10
1.43
-
-
1
342
5
23.5
1
Unit
V
mA
µA
µA
MHz
V
mA
µA
mV
%
V
µA
3
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TB62737FUG
Application Note
VIN
4.7-10µH
4
3
VIN
Over Volt.
Detection
Reference
Mono Multi
TSD
2.2µF
Level
Detect
1.0-2.5V
Analog
1
PWM
SHDN
GND
CTL
AMP.
5
Error
AMP.
6
FB
16Ω
@20mA
Off Time
Control
Mono Multi
CTL
AMP.
1µF
SW
2
OVD
Protection in LED opened condition
The operation with OVD terminal is available for the protection in case LED Circuit opened.
Please see the example of application circuit.
If load of LED is detached, Nch MOS switching operation is disabled with detection of boost circuit voltage.
4
2005-04-14
传感器
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