L9908 datasheet(49/153 Pages) STMICROELECTRONICS

49 / 153 page

5.11.1

Pre-regulation stage

The pre-regulator stage has the purpose to generate an intermediate supply rail to be used as a reference level

for the Ext. FET ON driving. This function is carried out by a current-limited Single Stage 2-Phases Dickson

charge pump with external capacitance.

Charge Pump1 can be disabled by the dedicated SPI bit CP1_DIS within the SAFETY_RELEVANT3 register, as

follows:

Table 43. Charge pump 1 enable bit

CP1_DIS

Description

Charge Pump 1 Enabled (Default)

Charge Pump 1 Disabled

Table 44. Pre-regulation stage electrical characteristics

Symbol

Parameter

Test Condition

Min Typ Max Unit

Notes

CP1_iout1

Charge Pump1 external Load Current for

no VPRE_UV

5.5 V ≤ VBP < 8 V

CFLY1 = 1 μF

CPRE = 4.7 μF

mA -

CP1_iout2

Charge Pump1 external Load Current for

no VPRE_UV

8 V ≤ VBP

CFLY1 = 1 μF

CPRE = 4.7 μF

mA -

CP1_vout1

Charge Pump1 Output Voltage

4.5 V ≤ VB = < 5.5 V

Iload ≤24 mA

CFLY1 = 1 μF

CPRE = 4.7 μF

5.8

(1)

CP1_vout2

Charge Pump1 Output Voltage

5.5 V ≤ VBP < 11 V

Iload = 24 mA

CFLY1 = 1 μF

CPRE = 4.7 μF

(1)

CP1_vout3

Charge Pump1 Output Voltage

11 V ≤ VBP

Iload = 36 mA

CFLY1 = 1 μF

CPRE = 4.7 μF

(1)

CP1_freq

Charge Pump1 Frequency

180 200 220 kHz

Not subject to

production test

VPRE_boot_time

VPRE boot time at high battery (VBP &

VDH > 10 V)

Iload ≤ 0 mA

CFLY1 = 1 μF

CPRE = 4.7 μF

0 V ≤ VPRE ≤ 7 V

0.2

0.5

ms -

VPRE_boot_time

VPRE boot time at low battery (VBP &

VDH < 10 V)

Iload ≤ 0 mA

CFLY1 = 1 μF

CPRE = 4.7 μF

0 V ≤ VPRE ≤ 7 V

0.5

ms -

1. Iload is the total external current out sink form VPRE equivalent to a gate charge load: Iload = (# of switching FETs) * fPWM

* QgTOT.

L9908

Gate driver supply

DS13546 - Rev 3

page 49/153

L9908 数据表(PDF) 49 Page - STMicroelectronics

L9908 数据表(HTML) 49 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

L9908 数据表(PDF) 49 Page - STMicroelectronics

L9908 数据表(HTML) 49 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载