LM3429MH/NOPB National Semiconductor, LM3429MH/NOPB Datasheet - Page 2

• Manufacturer Part Number: LM3429MH/NOPB
• Description: IC LED DRVR HP CONS CURR 14TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: High Power, Constant Currentr

Specifications of LM3429MH/NOPB

• Constant Current: Yes
• Topology: PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Automotive
• Type - Secondary: High Brightness LED (HBLED)
• Frequency: 2MHz
• Voltage - Supply: 4.5 V ~ 75 V
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP Exposed Pad, 14-eTSSOP 14-HTSSOP
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): No
• Efficiency: 95%
• For Use With: LM3429BSTEVAL - BOARD EVAL FOR BOOST LM3429LM3429BKBSTEVAL - BOARD EVAL FOR BUCK-BOOST LM3429
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: LM3429MH

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LM3429Q1MHX
Order Number
LM3429Q1MH
DAP
Connection Diagram
Ordering Information
*Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies.
Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified
with the letter Q. For more information go to http://www.national.com/automotive.
Pin Descriptions
LM3429MHX
(15)
Pin
LM3429MH
10
11
12
13
14
1
2
3
4
5
6
7
8
9
COMP
AGND
PGND
Name
GATE
nDIM
CSH
OVP
HSN
RCT
HSP
DAP
V
NC
V
IS
CC
IN
NOPB
NOPB
NOPB
NOPB
Spec.
LED Current Sense Negative
Thermal pad on bottom of IC
LED Current Sense Positive
Main Switch Current Sense
Resistor Capacitor Timing
Internal Regulator Output
Over-Voltage Protection
Current Sense High
Gate Drive Output
Analog Ground
No Connection
Compensation
Power Ground
Not DIM input
Input Voltage
Description
Package Type
TSSOP-14 EP
TSSOP-14 EP
TSSOP-14 EP
TSSOP-14 EP
NSC Package
Bypass with 100 nF capacitor to AGND as close to the device as possible in
the circuit board layout.
Connect a capacitor to AGND to set compensation.
Connect a resistor to AGND to set signal current. For analog dimming, connect
current source or potentiometer to AGND (see Analog Dimming section).
Connect a resistor from the switch node and a capacitor to AGND to set the
switching frequency.
Connect to PGND through the DAP copper circuit board pad to provide proper
ground return for CSH, COMP, and RCT.
Connect to a resistor divider from V
(OVLO). Turn-off threshold is 1.24V and hysteresis for turn-on is provided by
20 µA current source.
Connect a PWM signal for dimming as detailed in the PWM Dimming section
and/or a resistor divider from V
(UVLO). Turn-on threshold is 1.24V and hysteresis for turn-off is provided by
20 µA current source.
Leave open.
Connect to AGND through DAP copper pad to provide ground return for GATE.
Connect to the gate of the external NFET.
Bypass with a 2.2 µF–3.3 µF, ceramic capacitor to PGND.
Connect to the drain of the main N-channel MosFET switch for R
or to a sense resistor installed in the source of the same device.
Connect through a series resistor to LED current sense resistor (positive).
Connect through a series resistor to LED current sense resistor (negative).
Connect to AGND and PGND. For thermal considerations see
14-Lead TSSOP EP
Drawing
MXA14A
MXA14A
MXA14A
MXA14A
2
94 Units, Rail
2500 Units, Tape and Reel
94 Units, Rail
2500 Units, Tape and Reel
Application Information
30094404
Supplied As
IN
to program input under-voltage lockout
O
to program output over-voltage lockout
AEC-Q100 Grade 1
qualified. Automotive
Grade Production Flow*
Features
(Note
DS-ON
2).
sensing