MOTOROLA MC33680FTB, MC33680FTBR2 Datasheet
MC33680
N
V
Dual DC-DC Regulator for
Electronic Organizer
The MC33680 is a dual DC–DC regulator designed for electronic
organizer applications. Both regulators apply
Pulse–Frequency–Modulation (PFM). The main step–up 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 built–in 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 hand–held
products. With the low start–up 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 Power–Good signal, and back–up 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
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
VAUXSW
VAUXEMR
LIBATIN
LIBATOUT
NC
MAINGND
VMAINSW
VMAIN
• Power–Good Signal with Programmable Delay
• Battery Low Detection
• Lithium Battery or Supercap Back–up
• 32–Pin LQFP Package
APPLICATIONS:
• Digital Organizer and Dictionary
• Dual Output Power Supply (For MPU, Logic, Memory, LCD)
• Handheld Battery Powered Device (1–2 AA/AAA cell)
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32–LEAD LQFP
FTB SUFFIX
CASE 873A
PIN CONNECTIONS &
DEVICE MARKING
NC
VAUXBASE
VAUXCHG
VAUXFBN
VAUXBDVNCVAUXFBP
MC33680
FTB
AWLYYWW
VDD
VBAT
VBAT
VMAINFB
(Top View)
VREF
AGND
PDELAY
VAUXEN
NC
DGND
LIBATCL
LIBATON
LOWBATB
PORB
DGND
LOWBATSE
IREF
Semiconductor Components Industries, LLC, 2000
May, 2000 – Rev. 3
ORDERING INFORMATION
Device Package Shipping
MC33680FTB LQFP 1250 Tray / Drypack
MC33680FTBR2 LQFP 1800 / Tape & Reel
1 Publication Order Number:
MC33680/D
MC33680
VBAT
RIref
480 k
300 k
RLBa
LOBAT–
SEN
900 k
RLBb
DGND
PORB
W
8
W
9
W
10
11
IREF7AGND
Power–On
Reset
x2
Figure 1. Detailed Application Block Diagram
+ +
CPOR
80 nF
VREF
6
5
CVDD
20 mF
PDELAY
+ve Edge Delay
for Max. ON Time
for Min. OFF Time
VDD
4
RSQ
1–SHOT
3
5
ZLC
Qb
VBAT2VBAT
V
DGND
VBAT
COMP3
DD
RSQ
ILIM
1
VMAINFB
M1
COMP2
CMAINb
100 pF
RMAINb
1000 k
senseFET
V
DD
DGND
VBAT
L1
33 mH
MBRA130LT1
W
31
VMAINSW
VMAIN
32
M2
CMAIN
100 mF
VMAINGND
30
LIBATOUT
28
LIBATIN
27
VBAT
+
LOWBATB
LIBATON
LIBATCL
DGND
12
13
14
15
VAUXEN
Voltage
Reference
Voltage Reference
Current Bias
& Supervisory
1.22 V
AGND
0.85 V,
1.1 V
Lithium
Battery
Backup
17
0.5 V
VAUXFBP
COMP1
Main Regulator
with Synchronous Rectifier
VCOMP
COMP1
18
20
VAUXFBN
200 k
W
RAUXa
VCOMP
+ve Edge Delay
for Max. ON Time
RSQ
1–SHOT
for Min. OFF Time
Auxiliary Regulator
2200 k
W
RAUXb
VAUXBDV
Qb
L2
AGND
senseBJT
Q1
ILIM
COMP2
AGND
21
VBAT
22
VAUXCHG
23
VAUXBASE
33 mH
MBRA140T3
25
VAUXSW
CAUX
30 mF
VAUXEMR
26
+
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TIMING DIAGRAMS
VBAT
VMAIN
PORB
VAUXEN
V
MAINreg
– 0.15 V
MC33680
Figure 2. Startup Timing
T
POR
t
PORC
+
V
MAINreg
1.22
ǒ
0.5
Ǔ
C
RIref
por
VBAT
LOWBATB
VMAIN
PORB
LOWBAT Threshold
Figure 3. Power Down Timing
V
MAINreg
– 0.5 V
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Pin
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ББББББ
ББББББ
ББББББ
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Á
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Á
Á
Á
Á
Á
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Á
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No.
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2
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6
7
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ÁÁ
11
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MC33680
PIN FUNCTION DESCRIPTION
Function Type/Direction Description
VMAINFB
VBAT
VBAT
VDD
PDELAY
VREF
AGND
IREF
LOWBATSEN
DGND
ÁÁÁÁ
PORB
ÁÁÁÁ
LOWBATB
LIBATON
LIBATCL
ÁÁÁÁ
DGND
NC
VAUXEN
VAUXFBP
NC
VAUXFBN
VAUXBDV
VAUXCHG
VAUXBASE
ÁÁÁÁ
NC
VAUXSW
VAUXEMR
LIBATIN
LIBATOUT
NC
VMAINGND
VMAINSW
VMAIN
Analog / Input
Power
Power
Analog / Output
Analog / Input
Analog / Output
Analog Ground
Analog / Input
Analog / Input
Digital Ground
БББББ
CMOS / Output
БББББ
CMOS / Output
CMOS / Input
CMOS / Input
БББББ
Digital Ground
CMOS / Input
Analog / Input
Analog / Input
Power
Analog / Output
Analog / Output
БББББ
Analog / Output
Analog / Output
Analog / Input
Analog / Output
Power Ground
Analog / Input
Analog / Output
Feedback pin for VMAIN
Main battery supply
Main battery supply
Connect to decoupling capacitor for internal logic supply
Capacitor connection for defining Power–On signal delay
Bandgap Reference output voltage. Nominal voltage is 1.25V
Resistor connection for defining internal current bias and PDELAY current
Resistive network connection for defining low battery detect threshold
БББББББББББББББББ
Active LOW Power–On reset signal
БББББББББББББББББ
Active LOW low battery detect output
microprocessor control signal for Lithium battery backup switch, the switch is
ON when LIBATON=HIGH and LIBATCL=HIGH
microprocessor control signal for Lithium battery backup switch, if it is HIGH,
БББББББББББББББББ
the switch is controlled by LIBATON, otherwise, controlled by internal logic
no connection
VAUX enable, Active high
Feedback pin for VAUX
no connection
Feedback pin for VAUX
VAUX BJT base drive circuit power supply
test pin
test pin
БББББББББББББББББ
no connection
Collector output of the VAUX power BJT
Emitter output of the VAUX power BJT
Lithium battery input for backup purposes
Lithium battery output
no connection
Ground for VMAIN low side switch
VMAIN inductor connection
VMAIN output
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MC33680
ABSOLUTE MAXIMUM RATINGS (T
Parameter
Power Supply Voltage
Digital Pin Voltage V
General Analog Pin Voltage V
Pin VAUXSW to Pin VAUXEMR Voltage (Continuous) V
Pin VMAINSW to Pin VMAIN Voltage (Continuous)
Operating Junction Temperature
Ambient Operating Temperature
Storage Temperature
STATIC ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, VP = 1.8V, I
= 25°C, unless otherwise noted.)
A
Symbol Min Max Unit
V
BAT
digital
analog
AUXCE
V
syn
Tj
(max)
T
a
T
stg
load
–0.3
7.0
–0.3 7.0 Vdc
–0.3 7.0 Vdc
–0.3 30 Vdc
0.3
150
0
–50
70
150
= 0 mA, TA = 0 to 70°C unless
Vdc
Vdc
°C
°C
°C
otherwise noted.)
Rating
Operating Supply Voltage
1
VMAIN output voltage V
VMAIN output voltage range
VMAIN output current
VMAIN maximum switching frequency
2
3
4
VMAIN peak coil static current limit I
Symbol Min Typ Max Unit
V
BAT
main
V
main_range
I
3.3_1.8
Freq
max_VM
LIM_VM
1.0 V
3.1 3.3 3.5 V
2.7 5.0 V
200 mA
100 kHz
0.85 1.0 1.15 A
VAUX output voltage range VAUX_range 5.0 25 V
VAUX maximum switching frequency Freq
VAUX peak coil static current limit I
Quiescent Supply Current at Standby Mode
5
Reference Voltage @ no load Vref
Battery Low Detect lower hysteresis threshold
6
Battery Low Detect upper hysteresis threshold V
PDELAY Pin output charging current Ichg
PDELAY Pin voltage threshold Vth
NOTE: 1. Output current capability is reduced with supply voltage due to decreased energy transfer. The supply voltage must not be higher than
NOTE: 2. Output voltage can be adjusted by external resistor to the VMAINFB pin.
NOTE: 3. At VBAT = 1.8V, output current capability increases with VBAT .
NOTE: 4. Only when current limit is not reached.
NOTE: 5. This is average current consumed by the IC from VDD, which is low–pass filtered from VMAIN, when only VMAIN is enabled and at no loading.
NOTE: 6. This is the minimum of ”LOWBATB” threshold for battery voltage, the threshold can be increased by external resistor divider from ”VBA T” to
VMAIN+0.6V to ensure boost operation. Max Start–up loading is typically 1V at 400 µA, 1.8V at 4.4 mA, and 2.2V at 88 mA.
”LOWBATSEN”.
max_VL
LIM_VL
Iq
standby
no_load
V
LOBAT_L
LOBAT_H
PDELAY
PDELAY
1.0 A
35 60 µA
1.16 1.22 1.28 V
0.8 0.85 0.9 V
1.05 1.1 1.15 V
0.8 1.0 1.2 µA
1.16 1.22 1.28 V
120 kHz
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