VIN2
U6
VIN1
1
FREQ
CLKSYN
R11
0.022R
LDO
LFB
27
28
EN1
EN2
LCMP
1.5k
6.8nF
C34
10nF
/RESET
RT
BOOT
2
VBD
VBST
SW
SW
6
7
13
C40 R18
4.7nF 2.2R
VBD
12
C15
100nF
R4
10k
1
14
BOOT
L1
4.7uH
R10
300k
2
C10
+
100uF
C17
470pF
R9
300R
R12
R8
39k
C14
10nF
R19
510R
1
VOUT
29
C7 33nF
30
VIN2
C3
C37
10uF
+
C39
1.0uF
VIN2
VIN2
17
LCMP
VCC5V
VIN
1
+
C36
1.0uF
1
2
RLF7030-3R3M4R1
100uF
L2
1
10uH
SLF6025T
C33
10uF/16V
PGND
PGND
CLKSEL
ADDR
GND
GND
GND
GND
VDDI
VOUT
3
INV
2
31
26
23
C18
1.0uF
8
9
24
25
MC34701
10
11
C2
10uF
L3
3.3uH
4
5
R17
C35
18
19
R13
4.7k
C23
10uF
CS
20
CS
LDRV
32
15
16
SDA
SCL
21
LDRV
Q1
IRL2703S or MTD20N03HDL
R1
10k
1
1
1
1
22
C16
1.0uF
CLKSY N
SDA
SCL
GND
NOTES:
1. R11 can be adjusted according to the required LDO current limit.
2. R12 = 16K for Vout = 2.5V
R12 = 27K for Vout = 1.8V.
R12 = 36K for Vout = 1.5V.
3. L1 = 4.7uH, DO3316P-472HC from Coilcraft
or CDRH104R-4R7 from Sumida.
4. L2 = 10uH, SLF6025T-100M1R3 from TDK
or 1812PS-103M from Coilcraft.
5. L3 = 3.3uH, RLF7030-3R3M4R1 from TDK
6. C2 = 10uF/10V, ceramic capacitor .
7. C3, C10 = 100uF/6.3V, 10THB100ML POSCAP capacitor from Sanyo.
BOOT
Analog Integrated Circuit Device Data
Freescale Semiconductor
3.3V
R2
1
VLDO
5 x 2.2 uF
R15
1.5k
5.1k
1
RESET
C37, L3
Optional
C40, R18
Optional
D2
LL4148
Figure 34. 34701 Typical Application Circuit
Signal ground
Power ground
TYPICAL APPLICATION
34701
33