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

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.