33702 Datasheet, PDF (22/24 Pages) Motorola, Inc – 3.0 A Switch-Mode Power Supply with Linear Regulator

Freescale Semiconductor, Inc.
APPLICATION INFORMATION
+3.3VV
S_Su_up_pp_pl_ly_y
V_Vo_olt_la_tag_ge_e
V_VIINN11
C_IN
1010µuFF
V_VBSTT
C_BST
10¹⁰µ^uF^F
1100uµHH
L_BST VV_BB_DD
+3.3V
+3.3_oV_r or
V^VV_LL_LDD_DOO_O
EN1
5.1k
RREeSsEeTt
EN2
RESET
totoMMCUCU
RR_{t t}
100k
RT
CC_tt
100nF
ADDR
R_pd
10k
SDA
SCL
VVI_IN_N
8.0V
VVB_BS_ST_T
Power
Enable
Vref
V^VDDDDII
Boost
Control
Vref ^Bandgap
Voltage
Vref
Reference
V_VDDI
Internal
Supply
VVD_DD_DI_I
VB_BSS_TT
V^VDDDDI
V_VDDDDII
Linear
Regulator
Control
Vref
I_L-l_Ii_Mm
Reset
Control
POR
Timer
II²²C
Control
Reset
SysCon
INV
LFB
Thermal
Limit
Power
Sequencing
V^VL^LD^DO^O P_Po_Ww_R. S_See_qq_..
Power
Down _UVLO
Voltage Margining
WWat-cdhodgogTimTimerer
V^VOOUT
V^VBST
Current
Limit
II²²C
Control
V^VDDDDI
Buck
HS
SysCon
SoftSt
Buck
Control
Logic
&
LS
Driver
V^VDDDDII
1.0 uF
LDRV
CS
LDO
Q_LDO
R_S
0.068 ΩR
VV_LDDOO == 22.5VV
@ 1.0AA
LFB
?k
?k
Q4 ^{LCMP 1.5k}
100pF
VVBBSSTT
6.8nF
C_LDO
5₅ x_x2₂.2_.2u_µF_F
BOOT
V_VIINN22
(2)
Q1
C_IN
2² x^{x 1}1⁰0^uµ^FF
SW
(2)
Q2
VVBBSSTT
++33..3VV
SSuupppplly
V^Vol^tt^aa^gg^ee
D_B
C_B 00.1.1uFµF
L1
4⁴.^.7⁷ µ^uH^H
II²²C
Interface
Switcher
Oscillator
300kHz
Slope
Comp.
PWM
Comp.
+
-
PGND
Error
Amp.
To Reset
+ ^{0.8V Control}
-
(2)
INV
V^VOOUUT
PW^PoR^wS^. eq.
Seq.
Q3 ^VVOOUUTT
?k
?k Rb
?k
?
?pF
VV_OOUUTT==11..88VV
@_@33.0.0AA
C_O
5⁵⁰0 ^uµ^FF
CLKSEL
CLKSYN
FREQ
R_F
(Optional)
(4)
GND
Figure 20. Simplified Block Diagram and Typical Application
33702
22
For More Information O^Mn^OTT^Oh^Ri^Os^LP^Ar^Ao^Nd^Au^LOc^Gt,^{INTEGRATED CIRCUIT DEVICE DATA}
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