R&E International
A Subsidiary of Microchip Technology Inc.
RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver
Product Specification
General Description
The RE46C107 is intended for use in 3V or 4.5V
battery or battery-backed applications. The circuit
features a DC-to-DC up-converter and driver circuit
suitable for driving a piezoelectric horn. A selectable
3.0V or 3.3V regulator is also provided for
microprocessor voltage regulation. An LED driver
and low battery detection and signaling are also
available.
Features
•
•
•
•
•
•
Low Quiescent Current
10V Up Converter
Low Horn Driver Ron
Voltage Regulation to 3.0V or 3.3V
Low Battery Detection
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging
Pin Configuration
Applications
Smoke detectors
CO Detectors
Personal Security Products
Electronic Toys
LBST
LBSET
VDD
LEDEN
LED
LX
VSS2
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LBOUT
FEED
HRNEN
HORNS
HORNB
VO
VREG
REGSEL
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage Range Except REGSEL & FEED
REGSEL Input Voltage Range
FEED Input Voltage Range
Input Current except FEED
Operating Temperature
Storage Temperature
Continuous Operating Current
(HornS, HornB, Vreg, VO)
SYMBOL
V
DD
V
OUT
V
in
V
inrs
V
infd
I
in
T
A
T
STG
I
O
VALUE
5
12
-.3 to V
reg
+.3
-.3 to V
dd
+.3
-10 to +22
10
0 to 50
-55 to 125
40
UNITS
V
V
V
V
V
mA
°C
°C
mA
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are
stress ratings only and operation at these conditions for extended periods may affect device reliability.
This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be used
when handling this product. Damage can occur when exposed to extremely high static electrical charge
© 2009 Microchip Technology Inc.
DS22160A-page 1
RE46C107
DC to DC Converter, Voltage Regulator and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
PIN DESCRIPTIONS
PIN#
1
PIN NAME
LBST
DESCRIPTION
Logic input used to activate low battery detection circuitry. This includes activating high
boost mode. Input is designed to interface with circuitry supplied by Vreg, so input voltage
levels will scale with the Vreg voltage. Input is disabled during brown-out.
Internally connected to the low battery comparator input used to sense the Vdd voltage
divider. The internal reference to which this node is compared is nominally 0.9V. Nominal
internal resistance to Vdd is 400kohm. Nominal resistance to Vss is 240kohm. The
resistance to Vss is changed to a nominal of 220kohm once a low battery condition is
detected. External resistances can be added in parallel to adjust the low battery threshold
voltage.
Connect to the positive supply voltage
Logic input used to enable the LED driver. Input is designed to interface with circuitry
supplied by Vreg, so input voltage levels will scale with the Vreg voltage. LED driver is
disabled during brown-out.
Open drain NMOS output used to drive a visible LED.
Open drain NMOS output used to drive the boost converter inductor. The inductor should
be connected from this pin to the positive supply through a low resistance path.
Internally connected to the source of the NMOS device used to drive the boost converter
inductor. Connect to the negative supply voltage through a low resistance path.
Connect to the negative supply voltage.
Logic input used to set the Vreg output voltage level. This input should always be tied to
either Vdd or Vss.
Regulated output voltage. Nominal output is 3.3V for REGSEL=Vdd and 3.0V for
REGSEL=Vss.
Boosted voltage produced by DC-DC converter, typically 4V or 10V.
This pin is connected to the metal electrode (B) of a piezoelectric transducer.
HS is a complementary output to HB and connects to the ceramic electrode (S) of the
piezoelectric transducer.
Logic input for horn enable designed to interface with circuitry supplied by Vreg. Input
voltage levels will scale with the Vreg voltage. Horn is disabled during brown-out.
Usually connected to the feedback electrode of the piezoelectric horn through a current
limiting resistor. If not used, this pin must be connected to Vss.
Logic output used to signal a low battery condition. Output pulls to Vreg when LBST is
high and a low battery condition is detected.
2
LBSET
3
4
VDD
LEDEN
5
6
7
8
9
10
11
12
13
14
15
16
LED
LX
VSS2
VSS
REGSEL
VREG
VO
HORNB
HORNS
HRNEN
FEED
LBOUT
© 2009 Microchip Technology Inc.
DS22160A-page 2
RE46C107
DC to DC Converter, Voltage Regulator and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Electrical Characteristics
Limits apply at Vdd=3V, Vss=Vss2=0V, Creg=10uF, Cvo=10uF, T
A
=0°C to 50°C, unless otherwise noted.
Typical values are at T
A
=27°C.
Parameter
Supply Voltage
Standby Supply
Current
Quiescent Supply
Current
Quiescent Ivo
Symbol
Vdd
Iddstby
Iddq
Ivoq
Iil
Test
Pin
3
Test Conditions
Operating
Inputs low; LBSET open; No
loads; DC-DC Running
Inputs low; LBSET open; No
loads;
VO=5V; Vlx=0.5V
Same conditions as above for
Iddq
LBST, LEDEN, HRNEN Inputs
Vin= VSS
REGSEL Input
Vin= Vss
FEED=-10V; VO=10V
LBST, LEDEN, HRNEN Inputs
Vin=Vreg
REGSEL Input
Vin=Vdd
FEED=+22V; VO=10V
LBST, LEDEN, HRNEN Inputs
REGSEL Input
FEED Input; VO=10V
LBST, LEDEN, HRNEN Inputs
REGSEL Input
FEED Input; VO=10V
HORNB or HORNS; Iout=16mA;
Vdd=3V; VO=10V
LED; Iout=10mA; VO=4V
LBOUT; Iout=100uA; Vdd=3V
HORNB or HORNS; VO=10V;
Iout=-16mA; HRNEN=Vreg
LBOUT; Iout=100uA; Vdd=2.1V
Vdd=3V; HRNEN=Vreg;
Iout=10mA
Vdd=3V; HRNEN=0V;
Iout=10mA
Min
2.0
Limits
Typ
14
7
4
Max
5.0
Units
V
uA
3
10
1, 4, 14
9
15
1, 4, 14
9
15
1, 4, 14
9
15
1, 4, 14
9
15
12,13
5
16
12,13
16
11
11
10.5
7.5
-100
-100
uA
uA
nA
nA
uA
nA
nA
uA
V
V
V
V
V
V
Input Leakage Low
Iilrs
Iilf
Iih
Input Leakage High
Iihrs
Iihf
Vil
Input Voltage Low
Vilrs
Vilf
Vih
Input Voltage High
Vihrs
Vihf
Output Low
Voltage
Output High
Voltage
Vol1
Vol2
Vol3
Voh1
Voh3
Vvo1
VO Output Voltage
Vvo2
-15
-50
100
100
20
50
1
1
3
Vreg-.7
2.3
7
.3
.3
.3
9.5
Vreg-.5
.5
.5
.5
V
V
V
V
V
9.7
Vreg-.3
8.5
3.5
10
4
11
4.4
V
V
© 2009 Microchip Technology Inc.
DS22160A-page 3
RE46C107
DC to DC Converter, Voltage Regulator and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Electrical Characteristics (continued)
Limits apply at Vdd=3V, Vss=Vss2=0V, Creg=10uF, Cvo=10uF, T
A
=0°C to 50°C, unless otherwise noted.
Typical values are at T
A
=27°C.
Parameter
VO Efficiency
Symbol
Voeff1
Voeff2
Test
Pin
Test Conditions
Iload= 10mA, Vdd=3V;
HRNEN=0V
Iload=100uA; Vdd=3V;
HRNEN=0V
Min
Limits
Typ
85
75
Max
Units
%
%
Low Battery
Threshold
LBST to LBOUT
Propagation Delay
VREG Voltage
Vlbat
Tplhlb
Vreg1
Vreg2
3
16
10
10
10
10
11
11
10
10
10
LBST=Vreg
Vdd=2.1; LBSET Cload=5pF
Iout<20mA; REGSEL=Vdd
Iout<20mA; REGSEL=Vss
Iout=0 to 20mA; HRNEN=Vreg
Iout=0 to 20mA; HRNEN=0V
Falling edge of VO
Vv02 -Vobvt
VO=3.0V; Vreg=2.0V
REGSEL=Vdd
REGSEL=0V
2.3
2.4
10
2.55
20
3.4
3.1
50
50
4.0
V
us
V
V
mV
mV
V
mV
mA
3.2
2.9
3.3
3.0
30
30
VREG Load
Regulation
Brownout
Threshold
VO-to-Brownout
Margin
Brownout Pull
down
VREG over voltage
clamp
Vregld1
Vregld2
Vobvt
Vobvtm
Ibt
Vcl1
Vcl2
3.2
100
20
3.75
3.35
3.6
400
40
4
3.6
4.25
3.85
V
V
Notes on Electrical Characteristics:
1/ DC-DC converter in high boost mode (nominal VO=10V) can draw current pulses of greater than 1 Amp and is therefore very sensitive to
series resistance. Critical components of this resistance are the inductor DC resistance, the internal resistance of the battery and the
resistance in the connections from the inductor to the battery, from the inductor to the LX pin and from the Vss2 pin to the battery. In order to
function properly under full load at Vdd=2V, the total of the inductor and interconnect resistances should not exceed 0.3 ohm. The internal
battery resistance should be no more than 0.5 ohm and a low ESR capacitor of 10uF or more should be connected in parallel with the battery
to average current draw over the boost converter cycle.
2/ In the Electrical Characteristics Table, wherever a specific VO value is listed under test conditions, the VO is forced externally with the
inductor disconnected and the DC-DC converter is NOT running.
3/ The brown-out threshold voltage is the VO voltage at which the regulator and horn will be disabled. At VO voltages below the brown-out
threshold Vreg will be pulled to Vss.
4/ In normal operation, the regulator will provide high-side current of up to 20mA, but current sinking capability is typically under 1uA. The
overvoltage clamp is intended to limit the voltage at Vreg when it is pulled up by an external source.
5/ The limits shown are 100% tested at 25C only. Test limits are guard-banded based on temperature characterization to guarantee
compliance at temperature extremes.
© 2009 Microchip Technology Inc.
DS22160A-page 4
RE46C107
DC to DC Converter, Voltage Regulator and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Truth Table - Horn/Boost Logic
Status
Low Battery
Disabled;
Horn
Disabled
Low Battery
Enabled;
Horn
Disabled
Horn Enabled
Horn Enabled
LBST
0
HRNEN
0
FEED
X
HORNB
0
HORNS
0
VO (Typ.)
Vvo2 (4V)
1
X
X
0
1
1
X
0
1
0
1
0
0
0
1
Vvo1 (10V)
Vvo1 (10V)
Vvo1 (10V)
© 2009 Microchip Technology Inc.
DS22160A-page 5
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