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MAX1958

W-CDMA/N-CDMA Cellular Phone HBT PA Management ICs

Maxim Integrated 

W-CDMA/N-CDMA Cellular Phone HBT PA

Management ICs

(TA = +25°C, unless otherwise noted.)

Typical Operating Characteristics (continued)

TEMPERATURE SENSOR

ERROR vs. TEMPERATURE

1.5

1.0

0.5

0

-0.5

-1.0

-1.5

-40 -25 -10 5 20 35 50 65 80 95

TEMPERATURE (°C)

TEMPERATURE SENSOR

SUPPLY CURRENT vs. INPUT VOLTAGE

20

18

16

14

12

10

8

6

4

2

0

0123456

INPUT VOLTAGE (V)

Pin Description

PIN

NAME

FUNCTION

1

AOUT Op-Amp Output. AOUT discharges to AGND during shutdown.

2

SHDN2

Shutdown Control Input for the Op Amp. Drive to AGND to shut down the op amp. Connect to VCC or

drive high for normal operation.

3

AGND

Analog Ground. Ground for op amp, temperature sensor, and the precision circuits in the DC-to-DC

regulator. Connect to pin 6.

4

TOUT Analog Voltage Output Representing the Die Temperature. Bypass to AGND with a 0.01µF capacitor.

5

REF

Internal 1.25V Reference. Bypass to AGND with a 0.1µF capacitor.

6

AGND Analog Ground. Connect to pin 3.

Compensation. Typically, connect a 22pF capacitor from COMP to AGND and a 9.1kΩ resistor and

7

COMP 560pF capacitor in series from COMP to AGND to stabilize the regulator (see the Compensation and

Stability section).

External Reference Input. Connect ADJ to the output of a D/A converter for dynamic adjustment of the

8

ADJ

regulator’s output voltage. OUT regulates at (1.76 x VADJ) for the MAX1958 and (2 x VADJ - 0.8V) for

the MAX1959.

9

SHDN3 Shutdown Control Input for the Temperature Sensor. Drive to AGND to shut down the temperature

sensor. Connect to VCC or drive high for normal operation.

10

OUT

Output Voltage Feedback. Connect OUT directly to the output. OUT is high impedance during

shutdown.

11

PGND Power Ground for the DC-to-DC Converter

12

LX

Inductor Connection to the Internal Power MOSFETs

13

IN

Low-Current Supply Voltage Input. Connect to INP at the IC.

14 ______________________________________________________________________________________

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