LTC4220 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC4220

Negative Voltage Hot Swap Controllers

Linear Technology 

LTC4252-1/LTC4252-2

LTC4252A-1/LTC4252A-2

APPLICATIONS INFORMATION

UV/OV CLEARS VUVHI, CHECK OV CONDITION, GATE < VGATEL, SENSE < VCB
44


t
7OS AND TIMER < VTMRL

UV/OV OVERSHOOTS VOVHI AND TIMER ABORTS INITIAL TIMING CYCLE

UV/OV DROPS BELOW VOVLO AND TIMER RESTARTS INITIAL TIMING CYCLE

TIMER CLEARS VTMRL, CHECK GATE < VGATEL, SENSE < VCB
"/%
44


t
7OS

UV/OV

12

VOVHI

VUVHI

3

VOVLO

TIMER

5.8μA

10 12

4 5 67 8 9 11

VTMRH

VTMRL

˜"


t
*DRN

5.8μA

5.8μA

GATE

SS

SENSE

VGATEL

58μA


t
7ACL + VOS)


t
7CB + VOS)


t
7OS

58μA

VIN – VGATEH

VACL

VCB

DRAIN

VDRNCL

VDRNL

PWRGD

INITIAL TIMING

GATE

START-UP

425212 F12

Figure 12. Undervoltage Timing with an Overvoltage Glitch (All Waveforms Are Referenced to VEE)

OV OVERSHOOTS VOVHI. GATE AND SS ARE PULLED DOWN, PWRGD AND TIMER ARE UNAFFECTED

OV DROPS BELOW VOVLO, CHECK GATE < VGATEL, SENSE < VCB
"/%
44


t
7OS

1

2 34 5 67 8 9

OV

TIMER

VOVHI VOVLO

VTMRH

˜"


t
*DRN

5.8μA

5.8μA

GATE

SS

SENSE

VGATEL

58μA

58μA

VIN – VGATEH


t
7ACL + VOS)


t
7CB + VOS)


t
7OS

VACL

VCB

GATE

START-UP

425212 F13

Figure 13. Overvoltage Timing (All Waveforms Are Referenced to VEE)

425212fd

25

Share Link: