X
KTD2041
March 2022 – Revision 04b Page 1 of 20 Kinetic Technologies Confidential
9-Channel IR LED Driver with Buck Regulator and I
2
C Interface
Features
• 2.7V to 5.5V Input Voltage Operating Range
• Nine High-Precision Current Sinks
LED Current Up to 32mA per Channel
±1% Typical Current Matching
±2% Typical Current Accuracy at 32mA
6-bit Current Dimming Control with I
2
C
Independent On/Off Control
Supports both Independent and Global Dimming
• High Efficiency Buck Regulator
Integrated 200mΩ / 100mΩ High / Low-Side FET
Adaptive On-Time Control with default 1MHz
Switching Frequency, with factory programmable
1.5MHz, 2MHz, and 2.5MHz options.
Adaptive VOUT Control Based on the Headroom
Voltages of the LED Current Sinks.
Selectable Auto-Skip Mode or Forced-PWM mode
at Light Loads
• 140μA Typical No-Load Supply Current
• Open-Drain FAULT
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Signal Output and Fault Reset
• Extensive Fault Diagnostics
• -40°C - 85°C Operating Ambient Temperature Range
Small UQFN-20 (3mm x 3mm) Package
Applications
• IR LED Drivers
• Video Door Bells
• Security Cameras
• IRIS Recognition Cameras
Brief Description
The KTD2041 is an ideal power solution for IR LED
driver with an integrated buck regulator. It has 9 high-
precision current sinks that can be independently
controlled via I
2
C interface.
The buck regulator has an input voltage operating range
from 2.7V to 5.5V to accommodate 1-cell lithium- ion
batteries or 5V voltage rail. It has adaptive output
voltage control based on the headroom voltages of the
LED current sinks to minimize the power consumption.
It has integrated high-side and low-side power FET. The
buck regulator features advanced adaptive On- Time
control with 1MHz switching frequency, which minimizes
external component counts and allows the use of a very
small inductor and capacitor.
The KTD2041 has 9 built-in current sinks, which features
independent On/Off control and 6-bit independent
current dimming via I
2
C interface. The KTD2041 has
extensive built-in protection features including cycle-by-
cycle current limit, input undervoltage Lockout (UVLO),
output over-voltage protection, LED fault (open or short)
protection and thermal shutdown protection.
The KTD2041 is available in a RoHS and Green
compliant 3mm x 3mm UQFN package.
Typical Application
GND
VOUT
L1
4.7µH
LED9
LED8
LED7
LED6
LED5
LED4
LED3
LED2
LED1
LX
VOUT
PGND
SDA
SCL
FAULT
RESET
MODE
EN
VIN
C
IN
10µF
VIN
2.7V to 5.5V
KTD2041
C
OUT
22µF
X
KTD2041
March 2022 – Revision 04b Page 2 of 20 Kinetic Technologies Confidential
Pin Descriptions
Pin #
Name
Function
1
MODE
Mode selection logic input pin. Low for Forced-PWM mode, High for Auto-Skip mode at light loads.
2
SDA
I
2
C Serial Interface Data.
3
SCL
I
2
C Serial Interface Clock.
4
FAULT
Fault signal open-drain output. Logic low output indicates fault conditions, logic high indicates no fault.
5
RESET
Fault Reset pin, connected to GND if not used.
6
LED9
LED9 current sink.
7
LED8
LED8 current sink.
8
LED7
LED7 current sink.
9
LED6
LED6 current sink.
10
GND
Analog Ground.
11
LED5
LED5 current sink.
12
LED4
LED4 current sink.
13
LED3
LED3 current sink.
14
LED2
LED2 current sink.
15
LED1
LED1 current sink.
16
VOUT
Buck regulator output voltage sense input.
17
PGND
Power Ground.
18
LX
Inductor connection for buck regulator.
19
VIN
Voltage Input for buck regulator and IC power.
20
EN
Chip enable logic input.
--
EP
Exposed Paddle -- connect to PCB ground plane using multiple vias directly under the IC.
Pinout Diagram
UQFN33-20
XXYYZ
TOP VIEW TOP VIEW
LED1
LED5
11
12
13
14
151
2
3
4
5
1617181920
109876
LED4
LED3
LED2
LED1
RESET
FAULT
SCL
SDA
MODE
EN
VIN
LX
PGND
VOUT
LED9
LED8
LED7
LED6
GND
Exposed
Pad
20-Pin 3mm x 3mm x 055mm
UQFN Package, 0.4mm pitch
Top Mark
XX = Device ID Code, YWZ = Date and Assembly Code