RE46C107
DC to DC Converter, Voltage Regulator and R&E International
Piezoelectric Horn Driver
A Subsidiary of Microchip Technology Inc.
Product Specification
© 2009 Microchip Technology Inc. DS22160A-page 4
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.
Limits
Parameter Symbol
Test
Pin Test Conditions
Min Typ Max
Units
Voeff1
Iload= 10mA, Vdd=3V;
HRNEN=0V
85 %
VO Efficiency
Voeff2
Iload=100uA; Vdd=3V;
HRNEN=0V
75 %
Low Battery
Threshold
Vlbat 3 LBST=Vreg 2.3 2.4 2.55 V
LBST to LBOUT
Propagation Delay
Tplhlb 16 Vdd=2.1; LBSET Cload=5pF 10 20 us
Vreg1 10
Iout<20mA; REGSEL=Vdd
3.2 3.3 3.4 V
VREG Voltage
Vreg2 10
Iout<20mA; REGSEL=Vss
2.9 3.0 3.1 V
Vregld1 10
Iout=0 to 20mA; HRNEN=Vreg
30 50 mV
VREG Load
Regulation
Vregld2 10
Iout=0 to 20mA; HRNEN=0V
30 50 mV
Brownout
Threshold
Vobvt 11 Falling edge of VO 3.2 3.6 4.0 V
VO-to-Brownout
Margin
Vobvtm 11 Vv02 -Vobvt 100 400 mV
Brownout Pull
down
Ibt 10 VO=3.0V; Vreg=2.0V 20 40 mA
Vcl1 10 REGSEL=Vdd 3.75 4 4.25 V
VREG over voltage
clamp
Vcl2 10 REGSEL=0V 3.35 3.6 3.85 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.
