LM3434QX/NOPB National Semiconductor, LM3434QX/NOPB Datasheet - Page 3

• Manufacturer Part Number: LM3434QX/NOPB
• Description: IC LED DRIVER DIMM 24-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: High Power, Constant Currentr

Specifications of LM3434QX/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Automotive
• Type - Secondary: High Brightness LED (HBLED)
• Frequency: 1MHz
• Voltage - Supply: 3 V ~ 5.8 V
• Mounting Type: Surface Mount
• Package / Case: 24-LLP
• Operating Temperature: -40°C ~ 125°C
• Internal Switch(s): No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Current - Output / Channel: -
• Efficiency: -
• Other names: LM3434QX

Block Diagram
Pin
EP
15
16
17
18
19
20
21
22
23
24
Name
DIMO
DIMR
BST2
CSN
BST
CSP
V
V
HO
HS
NC
CC
EE
Low side FET gate drive power bypass connection and boost diode anode connection. Tie a
2.2µF capacitor between V
High side "synchronous" FET drive bootstrap rail.
High side "synchronous" FET gate drive output. Pulled to HS in shutdown.
Switching node and high side "synchronous" FET gate drive return.
LED dimming FET gate drive return. Tie to LED cathode. If PWM dimming is not used this pin
may be left open.
LED dimming FET gate drive output. DIMO is a driver that switches between DIMR and BST2.
If PWM dimming is not used this pin may be left open.
DIMO high side drive supply pin. Tie a 0.1µF between BST2 and CGND.
No internal connection. Tie to V
Current sense amplifier inverting input. Connect to current sense resistor negative terminal.
Current sense amplifier non-inverting input. Connect to current sense resistor positive terminal.
Exposed Pad on the underside of the device. Connect this pad to a PC board plane connected
to V
EE
.
CC
3
and V
EE
or leave open.
EE
.
Function
30098903
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