AOZ1935QI

AOZ1935QI Datasheet

AOZ1934/1935

Part	Datasheet
AOZ1935QI	AOZ1935QI (pdf)

PDF Datasheet Preview
AOZ1934/1935 High Efficiency Boost 20-, 30- LED Driver The AOZ1934/5 is an ideal power solution for white LED backlighting for medium to small size LCD panels. It is a highly integrated step up DC-DC converter with input voltage range from 2.7V to 25V, accommodating 1-, 2-, 3-, or 4-cell lithium ion batteries or 3.3V, 5V, 12V or 20V regulated supplies. The AOZ1934/5 integrates a 40V power MOSFET as well as compensation and soft start circuitry, which results in a simpler and smaller solution with much fewer external components. A high switching frequency 800kHz allows the use of a smaller inductor and capacitor to further reduce the solution size. Each of the regulated current sinks in the AOZ1934/5 provides 20mA factory programmed current. With a maximum of 40V at the output of the step-up converter, each string can connect up to ten LEDs in series, for a total of 20 LEDs for AOZ1934 and 30 LEDs for AOZ1935. The AOZ1934/5 is equipped with fast PWM dimming control for wide dimming range and has an enable pin for IC ON/OFF control. Various protection features are built into the AOZ1934/5, including cycle-by-cycle input current limit protection, output over-voltage protection, LED fault open or short protection and thermal shutdown protection. The leakage current in shutdown mode is 0.1µA. The AOZ1934/5 is available in a 16-lead 3 x 3 x 0.75mm thin QFN package. Wide input range 2.7V to 25V Drive up to 30 LEDs AOZ1934 up to 20 LEDs 10s2p AOZ1935 up to 30 LEDs 10s3p Up to 92% efficiency High frequency step-up converter 800kHz Highly integrated solution Integrated 40V Power MOSFET Internal compensation and soft start Integrated current sinks AOZ1934 2 channels, AOZ1935 3 channels ±2% Typ. current accuracy Typ. current matching PWM dimming with <1µs delay time Low operating quiescent current 500µA LED open/short protection Both internal fixed and external adjustable Over-voltage protection Cycle-by-cycle inductor current limit 2.5A 0.1µA shutdown current Green Package 3 x 3 QFN-16 -40°C to +85°C temperature range Netbook Tablet PCs GPS Portable media players 1-, 2-, 3-, 4-cell Li Ion LED applications Page 1 of 15 Typical Application Circuit LED Power Input Voltage Range 3V to 25V C IN 10µF L = 4.7µH IC Supply 2.7V to 5.5V Enable PWM Dimming Control AOZ1935 AVCC C AVCC 1µF EN PWM GND VOUT S1 S2 S3 PGND C OUT 1µF AOZ1935 White LEDs Up to 10 in series Ordering Information Ambient Temperature Range AOZ1934QI* AOZ1935QI -40°C to +85°C -40°C to +85°C Contact manufacturer for product availability Package 3x3 QFN-16 3x3 QFN-16 AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information. Environmental Green Product Green Product Page 2 of 15 Pin Configuration VIN AVCC PGND OV 12 VOUT 11 S1 10 3 PWM S3 GND EN NC 3x3 QFN-16 Bottom View AOZ1935 Pin Description Pin Number 1, 2 3 4, 5 6 7 8 9 10 11 12 Pin Name LX PWM NC EN GND S3* S2 S1 VOUT 13 14 15, 16 PAD VIN AVCC PGND S3 is only for the AOZ1935. Pin Function Switching node of the step-up converter Pulse width controlled dimming input. Connect this pin to AVCC when not used Not internally connected IC enable Analog Ground pin Regulated output current sink #3 Regulated output current sink #2 Regulated output current sink #1 Output voltage sense pin Over voltage feedback sense pin. Programmable with a resistor divider, this pin has an internal 1.2V threshold Boost converter power supply’s input voltage sense pin Input supply pin for the IC Power Ground pin Exposed Backside Paddle. Connect to ground for electrical and thermal usage. PAD is internally connected to Analog Ground pin. Page 3 of 15 AOZ1935 Functional Block Diagram LED Power Input 3V to 25V PGND VOUT Converter Control Over Voltage Control Backlight Unit

PDF Datasheet Preview

AOZ1934/1935

High Efficiency Boost 20-, 30- LED Driver

The AOZ1934/5 is an ideal power solution for white LED backlighting for medium to small size LCD panels. It is a highly integrated step up DC-DC converter with input voltage range from 2.7V to 25V, accommodating 1-, 2-, 3-, or 4-cell lithium ion batteries or 3.3V, 5V, 12V or 20V regulated supplies. The AOZ1934/5 integrates a 40V power MOSFET as well as compensation and soft start circuitry, which results in a simpler and smaller solution with much fewer external components. A high switching frequency 800kHz allows the use of a smaller inductor and capacitor to further reduce the solution size.

Each of the regulated current sinks in the AOZ1934/5 provides 20mA factory programmed current. With a maximum of 40V at the output of the step-up converter, each string can connect up to ten LEDs in series, for a total of 20 LEDs for AOZ1934 and 30 LEDs for AOZ1935.

The AOZ1934/5 is equipped with fast PWM dimming control for wide dimming range and has an enable pin for IC ON/OFF control. Various protection features are built into the AOZ1934/5, including cycle-by-cycle input current limit protection, output over-voltage protection, LED fault open or short protection and thermal shutdown protection. The leakage current in shutdown mode is 0.1µA.

The AOZ1934/5 is available in a 16-lead 3 x 3 x 0.75mm thin QFN package.

Wide input range 2.7V to 25V Drive up to 30 LEDs

AOZ1934 up to 20 LEDs 10s2p AOZ1935 up to 30 LEDs 10s3p Up to 92% efficiency High frequency step-up converter 800kHz Highly integrated solution Integrated 40V Power MOSFET Internal compensation and soft start Integrated current sinks AOZ1934 2 channels, AOZ1935 3 channels ±2% Typ. current accuracy Typ. current matching PWM dimming with <1µs delay time Low operating quiescent current 500µA LED open/short protection Both internal fixed and external adjustable Over-voltage protection Cycle-by-cycle inductor current limit 2.5A 0.1µA shutdown current Green Package 3 x 3 QFN-16 -40°C to +85°C temperature range

Netbook Tablet PCs GPS Portable media players 1-, 2-, 3-, 4-cell Li Ion LED applications

Page 1 of 15

Typical Application Circuit

LED Power Input Voltage Range 3V to 25V

C IN 10µF

L = 4.7µH

IC Supply 2.7V to 5.5V

Enable PWM Dimming Control

AOZ1935

AVCC

C AVCC 1µF

EN PWM GND

VOUT S1 S2 S3

PGND

C OUT 1µF

AOZ1935

White LEDs Up to 10 in series
Ordering Information

Ambient Temperature Range

AOZ1934QI* AOZ1935QI
-40°C to +85°C -40°C to +85°C
*Contact manufacturer for product availability

Package 3x3 QFN-16 3x3 QFN-16

AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information.

Environmental Green Product Green Product

Page 2 of 15

Pin Configuration

VIN AVCC PGND

OV 12

VOUT 11

S1 10
3 PWM

S3* GND EN NC
3x3 QFN-16

Bottom View

AOZ1935

Pin Description

Pin Number
1, 2 3
4, 5 6 7 8 9 10 11 12

Pin Name

LX PWM NC

EN GND S3* S2

S1 VOUT
13 14 15, 16 PAD

VIN AVCC PGND
*S3 is only for the AOZ1935.

Pin Function

Switching node of the step-up converter Pulse width controlled dimming input. Connect this pin to AVCC when not used Not internally connected IC enable Analog Ground pin Regulated output current sink #3* Regulated output current sink #2 Regulated output current sink #1 Output voltage sense pin Over voltage feedback sense pin. Programmable with a resistor divider, this pin has an internal 1.2V threshold Boost converter power supply’s input voltage sense pin Input supply pin for the IC Power Ground pin Exposed Backside Paddle. Connect to ground for electrical and thermal usage. PAD is internally connected to Analog Ground pin.

Page 3 of 15

AOZ1935

Functional Block Diagram

LED Power Input 3V to 25V

PGND

VOUT

Converter Control

Over Voltage Control

Backlight Unit

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AOZ1935QI Datasheet file may be downloaded here without warranties.

Datasheet ID: AOZ1935QI 516320