Figure 9.3-16. Pmle4427A/ Pmle4427B Regulators Schematic - Motorola XTS 2500 Service Manual

UHF2 Schematics, Board Overlays, and Parts Lists
R524
0
SW_B+
RESET_OUT
R521
0
NP
C513
10uF
VSW1
6816985H01-F
D510
NP
*U500*
LP2989
4 5
INPUT OUTPUT
8 7
SHUTDOWN ERROR
6
SENSE
330K
1 2
BYPASS NC NC R520
C514
10uF
C510
0.1uF
C521
.01uF
C511
0.1uF
PLACE L500 and C509 CLOSE TO CONTROLLER
100uH
L502
Remove L502 and place R521 to
drive ABACUS regulator from 5V supply
D511
C525 C540
330pF 270pF
D512
R528
0
U501
LP3985
3
VEN
1 5
VIN VOUT
4
BYPASS
C522 C516
.01uF 1uF
R527
0
NP
C518 C506 C512
10uF 1uF 0.1uF
C526 C541
330pF 270pF
D513
U502
LP3985
3
VEN
1 5
VIN VOUT
4
BYPASS
C523
.01uF
C517 C527
1uF 330pF

Figure 9.3-16. PMLE4427A/ PMLE4427B Regulators Schematic

9.3-17
POR
ANA_5V
ANA_3V
ABACUS_3V
February 14, 2012