LM3432BSQ National Semiconductor, LM3432BSQ Datasheet - Page 6

• Manufacturer Part Number: LM3432BSQ
• Description: LM3432/LM3432B 6-Channel Current Regulator for LED Backlight Application; Package: LLP; No of Pins: 24; Qty per Container: 1000; Container: Reel
• Manufacturer: National Semiconductor

www.national.com
Switching Characteristics
Output Current
Fault Detection
t
Thermal Protection
V
V
t
V
D_SHORTFAULT
V
I
I
D_OPENFAULT
I
OUT20_match
OUT40_match
DROP_IOUT20
DROP_IOUT40
LEAK_FAULT
OTM
SHORTFAULT
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. The Recommended Operating Limits define the conditions within
which the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, T
and the ambient temperature, T
the maximum allowable power dissipation will cause excessive die temperature.
Note 4: All limits are guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate
Average Outgoing Quality Level (AOQL). Typical values represent the most likely parametric norm at T
Note 5: I
Note 6: Rating limits apply to both the LM3432 and LM3432B.
Note 7: Dropout voltage is defined as the IOUT pin to GND voltage at which the output current sink drops 10% from the nominal value.
Symbol
I
FAULT_LOW
I
T
OUT_OFF
OUT_max
I
I
V
OTM
SDHYST
t
OUT20
OUT40
T
pd_H
IREF
T
SD
r
HYST
OUT_match
Parameter
IOUT Rising Edge Phase Delay
IOUT Rise Time
IREF pin Voltage
Constant Current Sink of 20mA
Constant Current Sink of 40mA
Output Current Matching of I
Output Current Matching of I
Maximum Output Current, IREF shorted to
GND.
Dropout Voltage of I
Dropout Voltage of I
Output Current when EN is LOW
V
Short Fault Delay
Open Fault Delay (LM3432 only)
FAULTb and OTMb LOW
FAULTb and OTMb Open Leakage
Over Temperature Monitor Threshold
Over Temperature Monitor Hysteresis
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
IOUT
is the greatest percentage delta between output string currents with respect to the median.
Short Fault Threshold
A
. The maximum allowable power dissipation at any ambient temperature is calculated using: P
OUT20
OUT40
(Note 7)
(Note 7)
OUT20
OUT40
(Note 5)
(Note 5)
Conditions
MODE = GND, Pulsing PWM 10µs
MODE = GND, rising edge from 10%
to 90% of IOUT
6V
R
R
6V
6V
V
R
R
EN = 0, V
FAULTb goes LOW during V
rising, other V
V
other V
V
5mA into FAULTb
V
IREF
IOUT
IOUTX
FAULTb
IREF
IREF
IREF
IREF
6
≤
≤
≤
V
V
V
= 0V, V
= 54.7k, V
= 27.5k, V
= 54.7k
= 27.5k
set to 10V, FAULTb goes LOW,
IN
IN
IN
set open, FAULTb goes LOW
IOUT
= V
≤
≤
≤
OUT
s
40V
40V
40V
OTMb
= 1.0V
IOUT
= 80V
IOUT
IOUT1-6
IOUT1-6
= 5V
= 4.5V
s
= 1.0V
J
J_MAX
= 25°C and are provided for reference purposes only.
= 1.1V
= 1.6V
, the junction-to-ambient thermal resistance, θ
IOUT
D_MAX
1.215 1.245
18.85
18.5
37.9
37.3
Min
7.3
50
= (T
J_MAX
0.025
0.005
Typ
500
150
125
165
0.3
0.6
7.9
25
20
40
80
50
20
20
- T
A
)/θ
21.05
41.55
42.15
0.525
1.125
Max
1.27
21.4
2.25
110
JA
8.8
0.7
2
3
1
. Exceeding
Units
mA
mA
mA
JA
µA
µA
ns
ns
µs
µs
°C
°C
°C
°C
%
%
V
V
V
V
V