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MAX1541

Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

Maxim Integrated 

Dual Step-Down Controllers with Saturation

Protection, Dynamic Output, and Linear Regulator

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, VCC = VDD = ON1 = ON2 = 5V, SKIP = GND, LDOIN (MAX1541) = V+, TA = -40°C to +85°C, unless otherwise noted.)

(Note 4)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX UNITS

Four-Level Input Logic Levels

TON, OVP/UVP, LSAT, SKIP,

FBLANK

High

Open

REF

Low

VCC -

0.4V

3.15

1.65

3.85

V

2.35

0.5

Note 1: For the MAX1540A, the gate-driver input supply (VDD) is internally connected to the fixed 5V linear-regulator output

(LDOOUT),

and the linear-regulator input supply (LDOIN) is internally connected to the battery voltage input (V+).

Note 2: When the inductor is in continuous conduction, the output voltage has a DC regulation level higher than the error-comparator

threshold by 50% of the ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage has a DC regulation

level higher than the trip level by approximately 1.5% due to slope compensation.

Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the DH_ pin with LX_ = GND, VBST_ = 5V,

and a 250pF capacitor connected from DH_ to LX_. Actual in-circuit times may differ due to MOSFET switching speeds.

Note 4: Specifications to -40°C are guaranteed by design, not production tested.

Typical Operating Characteristics

(MAX1541 circuit of Figure 12, VIN = 12V, VDD = VCC = 5V, SKIP = GND, TON = REF, TA = +25°C, unless otherwise noted.)

OUT2 EFFICIENCY vs. LOAD CURRENT

(VOUT2 = 2.5V)

100

95

90

85

80

75

70

65

60

55

50

0.01

VIN = 7V

VIN = 12V

VIN = 20V

SKIP = GND

SKIP = VCC

0.1

1

10

LOAD CURRENT (A)

2.5V OUTPUT VOLTAGE (OUT2)

vs. LOAD CURRENT

2.55

2.54

2.53

2.52

2.51

2.50

2.49

2.48

0

SKIP = GND

SKIP = VCC

1

2

3

4

5

LOAD CURRENT (A)

OUT1 EFFICIENCY vs. LOAD CURRENT

(VOUT1 = 1.0V)

100

95

SKIP = GND

SKIP = VCC

90

85

80

75

70

65

VIN = 7V

60

VIN = 12V

55

VIN = 20V

50

0.01

0.1

1

10

LOAD CURRENT (A)

10 ______________________________________________________________________________________

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