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IZ1937 Schematic ( PDF Datasheet ) - Integral

Teilenummer IZ1937
Beschreibung White LED Step-Up Converter
Hersteller Integral
Logo Integral Logo 




Gesamt 7 Seiten
IZ1937 Datasheet, Funktion
IZ1937
White LED Step-Up Converter
(Functional equvalent of LT1937 Linear Technology Corporation)
Description
The IZ1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a
constant current. The device can drive two, three or four LEDs in series from a Li-Ion bat-
tery. Series connection of the LEDs provides identical LED currents resulting in uniform
brightness and eliminating the need for ballast resistors. The IZ1937 operates at 1.2MHz,
allowing the use of tiny external components. The output capacitor can be as small as
0.22uF, saving space and cost versus alternative solutions.
A low 95mV feedback voltage minimizes power loss in the current setting resistor for better
efficiency.
The device can used in mobile phones, PDAs, Handheld Computers, calculators, digital
cameras, MP3-players, GPS-receivers.
Features
Internally determined LED current
High Efficiency: 84% Typical
Drives Up to 4 LEDs from a 3.2V Supply
Drives Up to 6 LEDs from a 5V Supply
36V rugged bipolar switch
Fast 1.2MHz switching frequency
Uses tiny 1mm Tall Inductors
Requires only 0.22uF output capacitor
ICs are available for shipment in chip form on unsawn wafers
Tab 1. Contact Pad Description
Contact pad number
Symbol
Description
01 SW Switch pad (Pin)
02
GND
Common pad (pin)
03 VIN Input supply pad (pin)
04
SHDN
Shutdown pad (pin)
05
GND
Common pad (pin)
06 FB Feedback pad (pin)
1 Ver.1.0/9.02.2008
IZ1937-TSe.doc






IZ1937 Datasheet, Funktion
IZ1937
VIN
3 to 5 V
OFF ON
L1
22uHn
VD1
C1
1мк
VIN
SW
IZ1937
SHDN
FB
GND
VD2
C2
0,22uF
VD3
15 mA
VD4
R1
6,34Ohm
VD1 – Shottki diode;
VD2 – VD4 - diodes
Fig. 3 – Typical application diagramm (3 white LED driver supplied by Li-ion
battery)
6 Ver.1.0/9.02.2008
IZ1937-TSe.doc

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