MP2905- 3V to 28V INPUT, HYSTERETIC SYNCHRONOUS STEP-DOWN CONTROLLER

MP2905 Rev. 0.91

www.monolithicpower.com

3

4/18/2011

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2011. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

Parameter

Condition

Min

Typ

Max

Unit

IN Supply Voltage

3

(5)

28

V

REF output Voltage

4.75

5.0

5.25

V

REF maximum output

current

20

mA

BST output voltage

5.0

V

BST maximum output

current

20

mA

REF

Undervoltage

lockout (UVLO)

Rising

2.6

2.8

3

V

Falling

2.25

2.45

2.65

V

Hysteresis

350

mV

Supply Current

No

switching,

0.6

2

mA

0.7

2

0.6

2

Output

regulation

accuracy

0.593

0.6

0.607

V

Output

regulation

hysteresis

22

mV

FB Propagation Delay

FB falling to LG falling

50

ns

FB rising to HG falling

70

ns

Overvoltage-

Protection(OVP)

Threshold

0.7

0.75

0.8

V

High-Side

Current

–

Sense Program Current

60

uA

42.5

50

57.5

uA

Soft-Start

internal

Resistance

60

80

100

K

Fault Hiccup Internal SS

Pulldown Current

230

nA

HG Driver Resistance

Sourcing Resistance

2.1

Ω

Sinking Resistance

1.6

LG Driver Resistance

Sourcing Resistance

2.2

Ω

Sinking Resistance

1.1

Dead time

HG low to LG high and LG low to HG

high(adaptive)

40

ns

HG Minimum On-Time

100

200

ns

LG Minimum On-Time

Normal operation

100

200

ns

Current fault

475

ns

Thermal Shutdown

Rising temperature, hysteresis=20(typ)

140

(6)

Notes:

5)

If IN Supply Voltage is lower than 5V, circuit can keep work but the efficiency will be lower.

6) Guaranteed by design