33730_12 Datasheet, PDF (21/28 Pages) Freescale Semiconductor, Inc – Switch Mode Power Supply with Multiple Linear Regulators

TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
OPERATIONAL MODES
Optional
Protection FET
Battery
3.3uH
VBAT
10nF
1.0uF
100uF
VBAT
KA_VBAT
1.0uF
10nF
1.0 V
VKAM
10nF
4.7uF _CP
PFD
REGON
5. 1k
VIGN
IGN_ON
5.0 V
1.5R
1.0uF
5.0 V
1. 5R
1.0uF
4 x 5.1k
VREF1
VREF2
P1
P2
P3
RSTKAM
RSTH
RST3
RSTL
UVLO
/OVLO
Feed
Forward
Ramp
Generator
VKAM
15 mA,ILim,
TLim
Protection
FET
Drive
CP
Charge
Pump
Osc illat or
CP
Buck
Control Logic
HS Drive,
Level
Shif ter
SW
SW
FREQ
BOOT
22uH
SS26
SR ^RFreq
V@_@DD2V2_H00D0=0D005_Hm.0A=AV(5t_1o.10t_)aVl
100uF
VBG
Feedback Compensation Network
1₂0₀.4_k k _INV
1. 5nF
15.90k8 k
20-60 k₂⁽₀¹_k²⁾
2.2nF
56pF
VCOMP 2.2-4.7 nF⁽¹²⁾
430R
Enable
5.0 V,
ILim=150 mA
26.5V,-1V,TLim
T-lim
Standby
Control
5.0 V,
ILim=150 mA
26.5V,-1V,TLim
Band-Gap
Reference
VBG
Ref. Voltage
Programming
Block
VKAM, VDDL, VDD3,
VDD3_SBY
Ref. Voltage
VKAM
Reset Detect
VDDH
Reset Detect
VDD3
Reset Detect
VDDL
Reset Detect
VDD3
ILim,TLim
VDD3_SBY
ILim,TLim
VDDL
I _Lim
VDDH
10nF
VDD3_B
100nF
Q2
VDD3
3.3 V
4.7uF 10nF
VDDL_B
VDDL
Q1
1.5 V
10uF 10nF
HR Timer
HRT
RHRT
GND
Recommended Q1, Q2:
BCP68T1 (SOT-223)
NJD2873T4 (DPAK)
MJB44H11 (D2PAK)
Notes
12. The V_DDH total current includes the sum of all output currents of the IC.
13. Higher resistance (60 k) and higher capacitance (4.7nF) in the compensation network will reduce the V_DDH overshoot.
Compensation network values should be optimized for specific circuit applications.
Figure 8. 33730 Typical Application Circuit
Table 9. Programming Output Voltage (BOLD denotes selected combinations)
P1
High
P2
High
P3
High
V_DD3
3.3 V
V_DDL
2.6 V
V_KAM
2.6 V
High
High
Low
3.3 V
3.3 V
3.3 V
High
Low
High
3.3 V
1.5 V
1.0 V
High
Low
Low
3.3 V
3.3 V
1.0 V
Low
High
High
3.3 V Standby
3.3 V
1.0 V
Low
High
Low
2.0 V
3.15 V
5.0 V
Low
Low
High
2.6 V Standby
3.3 V
1.0 V
Low
Low
Low
2.6 V Standby
3.3 V
1.5 V
Analog Integrated Circuit Device Data
Freescale Semiconductor
33730
21