MAX8855ETJ datasheet(4/20 Pages) MAXIM

Part #	MAX8855ETJ

Description	Dual, 5A, 2MHz Step-Down Regulators Integrated Boost Diodes

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual, 5A, 2MHz Step-Down Regulators

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN_ = VVDD = VVDL = 3.3V, VFB_ = 0.5V, VSS_ = VREFIN = 600mV, PGND_ = GND, RFSYNC = 10kΩ, L = 0.47µH, CBST_ = 0.1µF,

CSS_ = 0.022µF, PWRGD_ not connected; TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.) (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

EN1, EN2

EN_ Logic-Low

0.7

V

EN_ Logic-High

1.7

V

TA = +25

°C-1

+1

EN_ Input Current

VEN_ = 0 or 3.6V,

VVDD = 3.6V

TA = +85

°C

0.01

µA

SS1, SS2

SS_ Charging Current

VSS_ = 300mV

5

8

11

µA

REFIN, SS2

Discharge Resistance

In shutdown or a fault condition

335

Ω

THERMAL SHUTDOWN

Thermal-Shutdown Threshold

(Independent Channels)

+165

°C

Thermal-Shutdown Hysteresis

20

°C

Note 2: All devices 100% production tested at TA = +25°C. Limits over temperature are guaranteed by design.

Note 3: VVDD must equal VVDL and be equal to or greater than VIN_.

EFFICIENCY

vs. LOAD CURRENT WITH 3.3V INPUT

LOAD CURRENT (mA)

1000

10

20

30

40

50

60

70

80

90

100

0

100

10,000

VOUT_ = 2.5V

VOUT_ = 1.2V

VOUT_ = 1.8V

EFFICIENCY

vs. LOAD CURRENT WITH 2.5V INPUT

LOAD CURRENT (mA)

1000

10

20

30

40

50

60

70

80

90

100

0

100

10,000

VOUT_ = 1.2V

VOUT_ = 1.8V

SWITCHING FREQUENCY vs. RFSYNC

RFSYNC (k

Ω)

12

600

800

1000

1200

1400

1600

1800

2000

2200

2400

400

36

9

15

18

21

Typical Operating Characteristics

(VIN1 = VIN2 = 3.3V, MAX8855/MAX8855A, circuit of Figure 6, TA = +25°C, unless otherwise noted.)

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