Figure 4-2 shows the LMR60430, LMR60430-Q1,
LMR60440, and LMR60440-Q1 pin diagram for the RBM
package. For a detailed description of the device pins, see the Pin Configuration
and Functions section in the LMR60430, LMR60430-Q1,
LMR60440, and LMR60440-Q1 datasheet.
Figure 4-2 Pin Diagram (RBM Package)
Table 4-6 Pin FMA for Device Pins
Short-Circuited to Ground
Pin Name
Pin No.
Description of Potential Failure Effects
Failure Effect Class
VIN
1
VOUT = 0V.
B
SW
2
Damage to high-side FET.
A
BOOT
3
VOUT = 0V. High-side FET does
not turn on.
B
NC
4
No effect.
D
PG
5
When not in use, this pin can be left
grounded (PG is not a valid signal and VOUT is normal).
D
FB
6
When in adjustable output mode,
VOUT approaches VIN. When in fixed output mode,
VOUT = 0V.
B
PGND
7
VOUT is normal.
D
MODE/SYNC
8
Device switches in AUTO mode.
VOUT is normal.
D
RT
9
Device stops switching until short to
GND is removed.
B
EN
10
VOUT = 0V. Enable is below
the VEN-TH and functionality is halted.
D
NC
11
No effect.
D
Table 4-7 Pin FMA for Device Pins
Open-Circuited
Pin Name
Pin No.
Description of Potential Failure Effects
Failure Effect Class
VIN
1
VOUT = 0V.
B
SW
2
VOUT = 0V.
B
BOOT
3
VOUT = 0V. High-side FET does
not turn on.
B
NC
4
No effect.
D
PG
5
When not in use, this pin can be left
open (PGOOD is not a valid signal and VOUT is
normal).
D
FB
6
VOUT approaches VIN.
C
PGND
7
VOUT can be abnormal.
C
MODE/SYNC
8
Mode of operation can toggle between
AUTO and FPWM.
C
RT
9
Internal clock does not operate properly
and the part does not switch.
B
EN
10
Pin cannot be left floating. Device
potentially does not enable.
B
NC
11
No effect.
D
Table 4-8 Pin FMA for Device Pins
Short-Circuited to Adjacent Pin
Pin Name
Pin No.
Shorted to
Description of Potential Failure Effects
Failure Effect Class
VIN
1
SW
Damage to low-side FET.
A
SW
2
BOOT
VOUT = 0V, high-side FET does
not turn on and there is not CBOOT.
B
BOOT
3
NC
No effect.
D
NC
4
PG
No effect.
D
PG
5
FB
In fixed output mode, VOUT =
0V. In adjustable mode, if a short happens before soft state is
complete, output voltage approaches input voltage supply.
B
FB
6
PGND
In fixed output mode, VOUT =
0V. In adjustable output mode, output voltage approaches the input
voltage supply.
B
PGND
7
MODE/SYNC
Device switches in AUTO mode.
VOUT is normal.
D
MODE/SYNC
8
RT
Device switches in FPWM mode.
VOUT is normal.
D
RT
9
EN
Internal clock does not switch at the
correct frequency.
C
EN
10
NC
No effect.
D
NC
11
VIN
No effect.
D
Table 4-9 Pin FMA for Device Pins
Short-Circuited to
Supply
Pin Name
Pin No.
Description of Potential Failure Effects
Failure Effect Class
VIN
1
VOUT is normal.
D
SW
2
Damage to low-side FET.
A
BOOT
3
Damage occurs to BOOT ESD.
A
NC
4
No effect.
D
PG
5
If supply voltage is greater than 20V,
damage occurs to PGOOD pin.
A
FB
6
If supply voltage is greater than 16V,
damage occurs.
A
PGND
7
VOUT = 0V.
B
MODE/SYNC
8
Device switches in FPWM mode.
VOUT is normal.
D
RT
9
Internal clock does not switch at the
correct frequency.