AOZ1950DI

AOZ1950DI Datasheet

AOZ1950

Part	Datasheet
AOZ1950DI	AOZ1950DI (pdf)

PDF Datasheet Preview
AOZ1950 Boost Regulator White LED Driver The AOZ1950 is a high-efficiency boost regulator with internal 60V MOSFET and input protection switch. The part is designed to drive up to twelve white LEDs in series. The AOZ1950 supports two dimming control methods analog dimming and PWM dimming. In analog dimming mode, the LED current can be linearly adjusted for ±12% with a DC voltage on DIM pin. In PWM dimming mode, the LEDs can be turned on and off by toggling EN pin with a square wave, and the brightness is proportional to the duty cycle of the control signal. AOZ1950 is a fixed OFF pulse regulator with adaptive pulse width as a function of input and output voltage. Typical switching frequency is 800kHz. This allows the use of low-profile inductor and capacitors. The AOZ1950 works from a 2.7V to 5.5V input voltage range supporting a wide range of applications. Other features include cycle-by-cycle current limit, Input voltage short circuit protection switch, open-LED over-voltage protection, input under-voltage lockout, thermal shutdown and soft-start. The AOZ1950 is available in a tiny 3mm x 3mm 10-pin DFN package and is rated over a -40°C to +85°C operating temperature range. z 2.7V to 5.5V input voltage range z internal N-channel MOSFET z Drives up to 12 White LEDs z 800kHz typical switching frequency with adaptive pulse width control z 150ns nominal OFF pulse z 300mV feedback regulation z Analog dimming via DIM pin z PWM dimming via EN pin z Cycle-by-cycle current limit z Short circuit protection switch z Open LED over-voltage protection z Thermal shutdown protection z Internal soft-start z Small 3mm x 3mm DFN package z Portable DVD Players z GPS Systems z Smart Phones z Sub Notebook PC L1 22uH VIN 2.7V-5.5V R1 1.5kΩ C3 22nF C1 4.7uF IND VIN LX VOUT AOZ1950 PGND AGND EN COMP C4 1nF C2 0.47uF R2 15Ω Page 1 of 14 Ordering Information Part Number AOZ1950DI Ambient Temperature Range -40°C to +85°C Package 3 x 3 DFN-10 AOS Green Products use reduced levels of Halogens, and are also RoHS compliant. Please visit for additional information. AOZ1950 Environmental Green Product RoHS Compliant Pin Configuration PGND 1 IND 2 VIN 3 VOUT 4 FB 5 AOZ1950DI PAD1 LX PAD2 AGND 10 LX 9 EN 8 AGND 7 DIM 6 COMP 3x3 DFN-10 Top View Pin Description Number 1 2 3 4 5 Name PGND IND VIN VOUT FB COMP 10 PAD1 PAD2 AGND EN LX AGND Power Ground. Top load switch. Connect to inductor. Input voltage. Output voltage. LED Current Feedback Input. The FB voltage is regulated at 300mV in normal operation. The FB sense resistor sets the nominal LED current. Compensation pin. Typically connected to RC filter network. Analog Brightness Control Input. DIM controls the LED brightness by adjusting the LED current in proportion to DIM voltage. The input range of DIM is between 250mV to 750mV, for -12% and +12% adjustment respectively. When DIM voltage is connected to VIN, the LED current is 100% of the normal setting. Controller Ground. Enable Input. Pull EN high to enable the LED driver output and pull EN low to disable the LED driver output. The user can use EN pin for PWM dimming. The input frequency range of EN is between 200Hz and 1kHz. Boost Regulator Switching Node. Boost Regulator Switching Node. Controller Ground. Page 2 of 14 AOZ1950 Absolute Maximum Rating Exceeding the Absolute Maximum Ratings may damage the device Parameter Rating VIN to AGND -0.3V to +6V LX, VOUT to AGND -0.3V to +60V DIM, EN, FB, COMP, IND VIN +0.3V PGND to AGND -0.3V to +0.3V Storage Temperature TS ESD Rating 1 -65°C to +150°C 2kV

PDF Datasheet Preview

AOZ1950

Boost Regulator White LED Driver

The AOZ1950 is a high-efficiency boost regulator with internal 60V MOSFET and input protection switch. The part is designed to drive up to twelve white LEDs in series. The AOZ1950 supports two dimming control methods analog dimming and PWM dimming. In analog dimming mode, the LED current can be linearly adjusted for ±12% with a DC voltage on DIM pin. In PWM dimming mode, the LEDs can be turned on and off by toggling EN pin with a square wave, and the brightness is proportional to the duty cycle of the control signal. AOZ1950 is a fixed OFF pulse regulator with adaptive pulse width as a function of input and output voltage. Typical switching frequency is 800kHz. This allows the use of low-profile inductor and capacitors. The AOZ1950 works from a 2.7V to 5.5V input voltage range supporting a wide range of applications. Other features include cycle-by-cycle current limit, Input voltage short circuit protection switch, open-LED over-voltage protection, input under-voltage lockout, thermal shutdown and soft-start.

The AOZ1950 is available in a tiny 3mm x 3mm 10-pin DFN package and is rated over a -40°C to +85°C operating temperature range.
z 2.7V to 5.5V input voltage range z internal N-channel MOSFET z Drives up to 12 White LEDs z 800kHz typical switching frequency with adaptive
pulse width control z 150ns nominal OFF pulse z 300mV feedback regulation z Analog dimming via DIM pin z PWM dimming via EN pin z Cycle-by-cycle current limit z Short circuit protection switch z Open LED over-voltage protection z Thermal shutdown protection z Internal soft-start z Small 3mm x 3mm DFN package
z Portable DVD Players z GPS Systems z Smart Phones z Sub Notebook PC

L1 22uH

VIN 2.7V-5.5V

R1 1.5kΩ

C3 22nF

C1 4.7uF

IND VIN

LX VOUT

AOZ1950

PGND

AGND EN

COMP

C4 1nF

C2 0.47uF

R2 15Ω

Page 1 of 14
Ordering Information

Part Number AOZ1950DI

Ambient Temperature Range -40°C to +85°C

Package 3 x 3 DFN-10

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

AOZ1950

Environmental Green Product RoHS Compliant

Pin Configuration

PGND 1 IND 2 VIN 3

VOUT 4 FB 5

AOZ1950DI

PAD1 LX

PAD2 AGND
10 LX 9 EN 8 AGND 7 DIM 6 COMP
3x3 DFN-10

Top View

Pin Description

Number 1 2 3 4 5

Name PGND

IND VIN VOUT FB

COMP
10 PAD1 PAD2

AGND EN

LX AGND

Power Ground. Top load switch. Connect to inductor. Input voltage. Output voltage. LED Current Feedback Input. The FB voltage is regulated at 300mV in normal operation. The FB sense resistor sets the nominal LED current. Compensation pin. Typically connected to RC filter network. Analog Brightness Control Input. DIM controls the LED brightness by adjusting the LED current in proportion to DIM voltage. The input range of DIM is between 250mV to 750mV, for -12% and +12% adjustment respectively. When DIM voltage is connected to VIN, the LED current is 100% of the normal setting. Controller Ground. Enable Input. Pull EN high to enable the LED driver output and pull EN low to disable the LED driver output. The user can use EN pin for PWM dimming. The input frequency range of EN is between 200Hz and 1kHz. Boost Regulator Switching Node. Boost Regulator Switching Node. Controller Ground.

Page 2 of 14

AOZ1950

Absolute Maximum Rating

Exceeding the Absolute Maximum Ratings may damage the device

Parameter

Rating

VIN to AGND
-0.3V to +6V

LX, VOUT to AGND
-0.3V to +60V

DIM, EN, FB, COMP, IND

VIN +0.3V

PGND to AGND
-0.3V to +0.3V

Storage Temperature TS ESD Rating 1
-65°C to +150°C 2kV

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Datasheet ID: AOZ1950DI 516321