L9300 datasheet(72/182 Pages) STMICROELECTRONICS

72 / 182 page

Charge pump

11.1

Charge pump functional description

The device uses a two-stage charge pump circuit with external capacitors to ensure external MOSFET pre–

drivers, valve drivers and VDD3/4 low drop performances are guaranteed during low battery cranking.

An internal control loop monitors the output voltage and controls the charge pump efficiency in order to reduce

charge pump activity at light loads to reduce emissions during normal activity; when the battery input is low the

charge pump is able to work at full power to guarantee relevant parameters.

The device provides an under voltage monitor on charge pump voltage. In case of fault the device behaves as

reported in the Functional table chapter and a dedicated SPI bit is set and latched. The diagnostic is not masked

during power-up phase.

Figure 41. Charge pump

Charge Pump

VC1

VC2 VC3

VC4

CTANK

VBATP

VCP

GADG1907171250PS

11.2

Charge pump electrical characteristics

5.5 V ≤ VBATP ≤ 19 V; -40 °C ≤ Tj ≤ 175 °C, unless otherwise noticed. All voltages refer to GND pin.

Table 44. Charge Pump electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit Pin

Charge pump

C1, C2

External capacitor

Application note

VCx

CTANK

Tank capacitor

Application note

220

VCP

VCP_freq

Charge pump frequency

fOSCINT[MG1] /34

kHz VCx

VCP_out

Target CP output

Design info, not tested

VBATP+9

VCP

VCP_out

Minimum charge pump output

voltage

Iload=10 mA VBATP

min=5.5 V

VBATP+7

VCP

Diagnostic

VCP_UV

VCP under voltage

VBATP+5 V

VBATP+6 V

VCP

VCP_UV_FLT

VCP digital under voltage filter

time

Guaranteed by scan

7.5

12.5

µs

VCP

L9300

Charge pump

DS12258 - Rev 4

page 72/182

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