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ZXLD1937, ZXLD1937ET, ZXLD1937ET5

Table of contents:
Info of ZXLD1937
Info of ZXLD1937ET
Info of ZXLD1937ET5

ZXLD1937, ZXLD1937ET, ZXLD1937ET5 Selling Leads, Datasheet

MFG:N/A Package Cooled:N/A D/C:09+

ZXLD1937, ZXLD1937ET, ZXLD1937ET5 Picture

ZXLD1937, ZXLD1937ET, ZXLD1937ET5 Datasheet download

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Part Number: ZXLD1937

MFG: N/A

Package Cooled: N/A

D/C: 09+

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ZXLD1937 General Description

The ZXLD1937 is a PFM inductive boost converter designed for driving 2, 3 or 4 series connected white LEDs from a Li-Ion cell and up to 8 LEDs from a 5V supply. The device operates from an input supply of between 2.5V and 5.5V and provides an adjustable output current of up to 50mA.

The ZXLD1937 includes the output switch and peak current sense resistor, and can operate with a maximum output voltage of 28V.

Quiescent current is typically 60A and a shutdown function is provided to reduce this current to less than 500nA in the 'off' state.

Output current can be adjusted by applying a PWM control signal to the 'Enable' pin. Depending upon the control frequency, this will provide either a continuous or a 'chopped' output current. The PWM filter components are contained within the chip.

The device is assembled in the TSOT23-5 pin package with 1mm maximum height profile.

ZXLD1937 Maximum Ratings

PARAMETER	SYMBOL	LIMIT	UNIT
Input voltage LX output voltage	(V_IN) (V_LX)	7 30	V V
Switch output current Power dissipation	(I_LX) (P_D)	500 300	mA mW
Operating temperature Storage temperature Junction temperature	(T_OP) (T_ST) (T_{j MAX})	-40 to 85 -55 to 150 125

NOTES:
Operation above the absolute maximum may cause device failure. Operation at the absolute maximum ratings for extended periods may reduce device reliability.

ZXLD1937 Features

• 1mm height profile TSOT23-5 pin package
• Internal PWM filter for flicker free output
• High efficiency (80% typ)
• Wide input voltage range: 2.5V to 5.5V
• Up to 50mA output current
• Low quiescent current: (60A typ)
• 500nA maximum shutdown current
• Up to 1MHz switching frequency
• Low external component count
• Inherently matched LED currents

ZXLD1937 Typical Application

• Mobile phones
• Digital cameras
• PDAs
• LCD modules
• Portable internet appliances
• Palmtop computers

ZXLD1937 Connection Diagram

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