BD9524MUV

Technical Note

3/20

www.rohm.com

2010.03 - Rev.C

© 2010 ROHM Co., Ltd. All rights reserved.

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Electrical characteristics - Continued

(unless otherwise noted, Ta=25℃ VIN=12V, CTL=5V, EN1=EN2=5V, REF1=2.5V, REF2=1.65V, FS1=FS2=0.582V)

Parameter

Symbol

Standard Value

Unit

Conditions

MIN.

TYP.

MAX.

[H

On Time 1

TON1

0.810

0.960

1.110

μs

REF=2.5V

On Time 2

TON2

0.520

0.670

0.820

μs

REF=1.65V

Maximum On Time

TONMAX

3.5

7

14

μs

Minimum Off Time

TOFFMIN

-

0.2

0.4

μs

FS1, FS2 bias current

IFS

-10

0

10

μA

[FET driver block]

HG higher side ON resistor

HGHON

-

3.0

6.0

Ω

HG lower side ON resistor

HGLON

-

2.0

4.0

Ω

LG higher side ON resistor

LGHON

-

2.0

4.0

Ω

LG lower side ON resistor

LGLON

-

0.5

1.0

Ω

[Over Voltage Protection block]

Latch Type OVP Threshold voltage

VLOVP

REF×2

×

1.15

REF×2

×

1.175

REF×2

×

1.20

V

Latch Type OVP delay time

TLOVP

50

150

300

μs

[Short circuit protection block]

SCP Threshold voltage

VSCP

REF×2×

0.66

REF×2

×

0.7

REF×2

×

0.74

V

Delay time

TSCP

0.5

1

2

ms

[Current limit protection block]

Maximum offset voltage

dVSMAX

50

65

80

mV

Is+1 bias current

IISP1

-

2.5

10

μA

Is+2 bias current

IISP2

-

2.5

10

μA

[Power good block]

Power good low threshold

VPGTHL

REF×2

×

0.87

REF×2

×

0.90

REF×2

×

0.93

V

Power good high threshold

VPGTHH

REF×2

×

1.07

REF×2

×

1.10

REF×2

×

1.13

V

Power good low voltage

VPGL

-

0.1

0.2

V

IPGOOD=1mA

Power good leakage current

ILEAKPG

-2

0

2

μA

VPGOOD=5V

[Soft Start block]

Charge current

ISS

1.8

2.5

3.2

μA

Standby voltage

VSS_STB

-

-

50

mV

[SLLM mode control block]

MCTL terminal voltage 1

VCONT

-0.3

-

0.3

V

Continuous mode

MCTL terminal voltage 2

VQLLM

1.5

-

3.0

V

QL

(Maximum LG off time : 50μs)

MCTL terminal voltage 3

VSLLM

4.5

-

REG1+0.3

V

SL

(Maximum LG off time : ∞)

MCTL float level

VMCTL

1.5

-

3.0

V

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Output condition table

Input

Output

CTL

EN1

EN2

REG1(5V)

REG2(3.3V)

DC/DC1

DC/DC2

Low

Low

Low

OFF

OFF

OFF

OFF

Low

Low

High

OFF

OFF

OFF

OFF

Low

High

Low

OFF

OFF

OFF

OFF

Low

High

High

OFF

OFF

OFF

OFF

High

Low

Low

ON

ON

OFF

OFF

High

Low

High

ON

ON

OFF

ON

High

High

Low

ON

ON

ON

OFF

High

High

High

ON

ON

ON

ON