MAX1959ETP-T Maxim Integrated Products, MAX1959ETP-T Datasheet - Page 20

• Manufacturer Part Number: MAX1959ETP-T
• Description: DC/DC Switching Converters WCDMA/NCDMA HBT PA Mgt IC
• Manufacturer: Maxim Integrated Products

Specifications of MAX1959ETP-T

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

W-CDMA/N-CDMA Cellular Phone HBT PA
Management ICs
Figure 3. Typical W-CDMA Power Amplifier Load Profile
SHDN2 may result in indeterminate logic levels, and
could adversely affect op-amp operation.
The MAX1958/MAX1959 op amp is unity-gain stable for
capacitive loads up to 470pF. Applications that require
a greater capacitive drive capability should use an iso-
lation resistor (R
capacitive load (Figure 5). Note that this alternative
results in a loss of gain accuracy because R
voltage-divider with R
Table 1. Recommended Inductors
Note: Efficiency may vary depending upon the inductor’s characteristics. Consult the inductor manufacturer for saturation current ratings.
20
800mA Application
Sumida
Toko
700mA Application
Sumida
Toko
400mA Application
Murata
Sumida
300mA Application
Murata
MANUFACTURER
______________________________________________________________________________________
3.4
3.0
1.0
0.4
0.0
0
30
ISO
972AS-4R7M = P5
LOAD
976AS-4R7 = P5
PA SUPPLY CURRENT (mA)
CDRH3D16-4R7
CDRH2D11-4R7
) between the output and the
LQH3C4R7M34
LQH1C4R7M04
CMD4D11-4R7
PART NO.
.
Driving Capacitive Loads
300
INDUCTANCE
ISO
(µH)
4.7
4.7
4.7
4.7
4.7
4.7
4.7
forms a
600
DC RESISTANCE
The power-supply voltage applied to V
amp and temperature sensor in the MAX1958/
MAX1959 circuit is filtered from INP. Connect V
INP through an RC network (R2 and C7 in Figure 4) to
ensure a quiet power supply.
The temperature sensor provides information about the
MAX1958/MAX1959 die temperature. The voltage at
TOUT (V
For stable operation, bypass TOUT to AGND with at
least a 0.01µF capacitor.
When the 800mA converter and the op amp are both
operated at heavy load while the temperature sensor is
enabled, the indicated temperature at TOUT deviates
several degrees from the actual ambient temperature
due to die self-heating effects. At light loads, when die
self-heating is low, TOUT tends to be a good approxi-
mation of the ambient temperature. At heavier loads,
the die self-heating is appreciable; TOUT gives a good
approximation of the die temperature, which can be
several degrees higher than the ambient temperature.
Temperature sensors like those found in the
MAX1958/MAX1959 that sense their own die tempera-
V
(mΩ)
220
166
320
200
170
650
Temperature Sensor Error Due to Die Self-Heating
TOUT
80
Sensing Circuit Board and Ambient Temperature
=
TOUT
(
-
4 10
×
) is related to die temperature as follows:
RATED DC MAX
-
6
CURRENT
×
T
(mA)
0.34
900
960
750
740
450
500
2
) ( .
+
-
1 13 10
Temperature Sensor
Power-Supply Bypass
×
-
2
DIMENSIONS
3.8 x 3.8 x 1.8
4.6 x 4.6 x 1.2
3.5 x 5.3 x 1.2
3.6 x 3.6 x 1.2
3.2 x 3.2 x 1.2
×
2.5 x 3.2 x 2
1.6 x 3.2 x 2
L x W x H
T
CC
)
(mm)
+
1 8708
for the op
.
CC
V
to