Datasheet

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POWER CONDITIONING - SMT
11
HMC1060LP3E
v00.1211
QUAD LOW NOISE HIGH PSRR
LINEAR VOLTAGE REGULATOR
HMC1060LP3E’s PTAT (Proportional to Absolute Temperature) Feature
The performance of most electronic circuits varies with temperature. The effect on performance is usually most
prevalent at high temperatures, where the electronic circuits slow down due to changes in transistor characteristics.
The HMC1060LP3E PTAT Mode is designed to counterbalance the effect of temperature changes on devices supplied
by the HMC1060LP3E. When PTAT Mode is enabled, the HMC1060LP3E scales output voltage proportionally with
temperature, resulting in higher supply voltage at high temperatures and lower supply voltage at lower temperatures,
as shown in Figure 6 and Figure 8.
Higher supply voltage has the opposite effect as that of temperature increase. It increases supply current and speeds
up electronic circuits, thereby improving performance and offsetting the negative effect of high temperature on device
performance.
HMC1060LP3E PTAT mode is enabled by grounding HMC1060LP3E’s PTATB pin. It is disabled by leaving the PTATB
pin of the HMC1060LP3E oating.
The rate at which HMC1060LP3E’s PTAT mode scales supply voltage with temperature is optimized to work with
Hittite’s Wideband PLLs with Integrated VCOs, such as the HMC830LP6GE. However, this feature is also benecial
for other products as well. Most electronic circuits slow down at higher temperatures. Higher supply voltage at higher
temperatures has the opposite effect of speeding up the circuitry by providing more current and thereby improving
performance.
Output Voltage Conguration
All of the outputs of the HMC1060LP3E can be congured to supply anywhere from 1.8 V to 5.2 V. The output voltage
is congured using external resistors. PTAT mode can be enabled/disabled for all output options.
Default Conguration
Three outputs (VR1, VR2, and VR3) supply 3.3 V by default, and one output (VR4) defaults to 5 V. The Default
conguration of the HMC1060LP3E is shown in the Application Schematic section of this document.
Supply Voltage Less Than Default Conguration
The outputs of the HMC1060LP3E are congured to supply voltages less than the default values, down to 1.8 V
minimum, by connecting a resistance (Ry in Figure 13) between pins VRx and RDx (where x = 1,2,3,4). Figure 13
shows an example of conguring VR1 output. Other outputs are congured in exactly the same way (ie. Ry is added
between VR2 & RD2, VR3 & RD3 and between VR4 & RD4).
1
2
3
4
5
6
10
4
10
5
10
6
10
7
PTAT Disabled
PTAT Enabled
OUTPUT VOLTAGE (V)
Ry RESISTANCE VALUE (Ohms)
Outputs
VR1, VR2, & VR3
Output VR4
Figure 13. Recommended HMC1060LP3E conguration
for supplying output voltage values less than default.
[1]
Figure 14. HMC1060LP3E output voltage as a function of
resistance Ry for each output at 27°C.
[2]
Resistance, Ry, required to congure the HMC1060LP3E to the desired output voltage level for each output of the
HMC1060LP3E is shown in Figure 14. The exact value of Ry can be calculated using (EQ 1), where internal resistances
[1] Example shows the conguration of only VR1 output of the HMC1060LP3E. Other outputs are congured in exactly the same way. .
[2] This curve is accurate only in cases where output voltage less than default is required. Minimum level is 1.8 V.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
Phone: [phone] • Order online at www.analog.com
Application Support: Phone: 1-800-ANALOG-D
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