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  ON Semiconductor Electronic Components Datasheet  

MC33680 Datasheet

Dual DC-DC Regulator

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MC33680 pdf
MC33680
Dual DC−DC Regulator for
Electronic Organizer
The MC33680 is a dual DCDC regulator designed for electronic
organizer applications. Both regulators apply
PulseFrequencyModulation (PFM). The main stepup regulator
output can be externally adjusted from 2.7V to 5V. An internal
synchronous rectifier is used to ensure high efficiency (achieve 87%).
The auxiliary regulator with a builtin power transistor can be
configured to produce a wide range of positive voltage (can be used
for LCD contrast voltage). This voltage can be adjusted from +5V to
+25V by an external potentiometer.
The MC33680 has been designed for battery powered handheld
products. With the low startup voltage from 1V and the low quiescent
current (typical 35 μA); the MC33680 is best suited to operate from 1
to 2 AA/ AAA cell. Moreover, supervisory functions such as low
battery detection, CPU PowerGood signal, and backup battery
control, for lithium battery or supercap are also included in the chip.
FEATURES:
Low Input Voltage, 1V up
Low Quiescent Current in Standby Mode: 35μA typical
PFM and Synchronous Rectification to ensure high efficiency
(87% @60mA Load)
Adjustable Main Output: +2.7V to +5V
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nominal 3.3V @ 100mA max, with 1.8V input
Auxiliary Output Voltage: +5V to +25V
+5V @ 25mA max, with 1.8V input
+25V @ 15mA max, with 1.8V input
Current Limit Protection
PowerGood Signal with Programmable Delay
Battery Low Detection
Lithium Battery or Supercap Backup
32Pin LQFP Package
APPLICATIONS:
Digital Organizer and Dictionary
Dual Output Power Supply (For MPU, Logic, Memory, LCD)
Handheld Battery Powered Device (12 AA/AAA cell)
http://onsemi.com
32 1
32LEAD LQFP
FTB SUFFIX
CASE 873A
PIN CONNECTIONS &
DEVICE MARKING
VAUXSW
VAUXEMR
LIBATIN
LIBATOUT
NC
VMAINGND
VMAINSW
VMAIN
MC33680
FTB
AWLYYWW
NC
DGND
LIBATCL
LIBATON
LOWBATB
PORB
DGND
LOWBATSEN
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
MC33680FTB
LQFP 1250 Tray / Drypack
MC33680FTBR2 LQFP 1800 / Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 4
1
Publication Order Number:
MC33680/D


  ON Semiconductor Electronic Components Datasheet  

MC33680 Datasheet

Dual DC-DC Regulator

No Preview Available !

MC33680 pdf
MC33680
VBAT
VBAT
CMAINb
100 pF
L1
33 mH
RIref
480 kW
CPOR +
80 nF
CVDD +
20 mF
RMAINb
MBRA130LT1
8 IREF 7 AGND 6 VREF 5 PDELAY 4 VDD 3 VBAT 2 VBAT 1 VMAINFB 1000 kW
VBAT
5
300 kW
RLBa
LOBAT−
SEN
9
900 kW
RLBb
DGND
10
PORB
11
Power−On
Reset
x2
ZLC
COMP3
+ve Edge Delay
for Max. ON Time
RQ
VDD
senseFET
M2
M1
S Qb
DGND
1−SHOT
for Min. OFF Time
VDD
RQ
S ILIM
DGND
COMP2
31
VMAINSW
32 VMAIN
CMAIN +
100 mF
VMAINGND
30
LIBATOUT
28
LIBATIN
27
VBAT
Voltage 1.22 V
Reference
0.5 V
COMP1
VCOMP
Main Regulator
with Synchronous Rectifier
LOWBATB
12
LIBATON
13
LIBATCL
14
DGND
15
AGND
0.85 V,
1.1 V
Lithium
Battery
Backup
Voltage Reference
Current Bias
& Supervisory
+ve Edge Delay
for Max. ON Time
VCOMP
COMP1
RQ
S Qb
1−SHOT
for Min. OFF Time
Auxiliary Regulator
AGND
senseBJT
Q1
ILIM
COMP2
AGND
L2
33 mH
MBRA140T3
25
VAUXSW
+
CAUX
30 mF
VAUXEMR
26
17
VAUXEN
18
VAUXFBP
20
VAUXFBN
2200 kW
RAUXb
21
VAUXBDV
VBAT
22
VAUXCHG
23
VAUXBASE
200 kW
RAUXa
Figure 1. Detailed Application Block Diagram
http://onsemi.com
2


Part Number MC33680
Description Dual DC-DC Regulator
Maker ON Semiconductor
Total Page 14 Pages
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