MAX77271 datasheet(4/20 Pages) MAXIM

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MAX77271

Multimode PA Step-Down Converter

with Linear Bypass Mode

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Typical Operating Characteristics

(Typical Operating Circuit, VIN1 = VIN2 = 4V, COUT = 10µF, L = 2.2µH, Taiyo Yuden MAKK201610 series, TA = +25°C, unless otherwise noted.)

Electrical Characteristics (continued)

(VIN1 = VIN2 = VMODE = 4V, VEN = 1.3V, VREFIN = 0.72V, TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise

noted.) (Note 3)

Note 3: The device is 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.

Note 4: Not tested in production, guaranteed by design and characterization.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

REFIN to Output Voltage Comparator

(tDEB_VC_OUTHI)

Fast slew down enabled

µs

POWER-UP TIMING (Figure 2)

Time Delay from EN Until LX Starts

Switching (tEN_BUCK)

µs

REFIN Transient (to 95% of Target)

(Note 4)

VOUT transition from 0.7V to 3.4V,

COUT = 14.1µF, L = 2.2µH, 5Ω load

µs

VOUT transition from 3.4V to 0.7V,

COUT = 14.1µF, L = 2.2µH, 20Ω

12.3

Time from EN High to VOUT Within 95%

of Regulation (Note 4)

µs

Output Noise (Note 4)

650MHz to 2.2GHz,

30kHz resolution

bandwidth,

COUT = 15µF,

L = 2.2µH,

TA = +25°C

2G mode; VIN = 4.3V,

3.8V; VOUT = 3.4V;

IOUT = 1.2A, 1.5A, 2.2A

-147

-95

dBm/Hz

3G mode; VIN = 4.3V,

3.4V; VOUT = 3.4V;

IOUT = 400mA, 500mA,

600mA

-148

-105

DROPOUT RESISTANCE

vs. LOAD CURRENT

LOAD CURRENT (mA)

2000

1500

1000

500

2500

VIN = 3.4V

VREFIN = 1.6V

500

1000

1500

2000

2500

3000

SWITCHING FREQUENCY

vs. REFIN VOLTAGE

REFIN VOLTAGE (V)

3500

1.2

0.8

0.4

1.6

2G AND 3G MODE

4Ω LOAD

VIN = 4V

500

1000

1500

2000

2500

3000

SWITCHING FREQUENCY

vs. REFIN VOLTAGE

REFIN VOLTAGE (V)

3500

1.2

0.8

0.4

1.6

2G AND 3G MODE

10Ω LOAD

VIN = 4V

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