APXH003A0X-SRZ_0910 Datasheet, PDF (16/23 Pages) Lineage Power Corporation – Pico TLynxTM 3A: Non-Isolated DC-DC Power Modules

Data Sheet
October 8, 2009
Pico TLynx^TM 3A: Non-isolated DC-DC Power Modules
2.4 – 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 3A output current
Recommended values of R_TUNE and C_TUNE for different
output capacitor combinations are given in Tables 2, 3,
4 and 5. Tables 2 and 4 show the recommended
values of R_TUNE and C_TUNE for different values of
ceramic output capacitors up to 470uF that might be
needed for an application to meet output ripple and
noise requirements for 5Vin and 3.3Vin respectively.
Selecting R_TUNE and C_TUNE according to Table 2 will
ensure stable operation of the module.
In applications with tight output voltage limits in the
presence of dynamic current loading, additional output
capacitance will be required. Tables 3 and 5 list
recommended values of R_TUNE and C_TUNE in order to
meet 2% output voltage deviation limits for some
common output voltages in the presence of a 1.5A to
3A step change (50% of full load), with an input
voltage of 5Vin and 3.3Vin respectively
Please contact your Lineage Power technical
representative to obtain more details of this feature as
well as for guidelines on how to select the right value
of external R-C to tune the module for best transient
performance and stable operation for other output
capacitance values or input voltages other than 3.3 or
5V.
Table 2. General recommended values of of R_TUNE
and C_TUNE for Vin=5V and various external ceramic
capacitor combinations.
Co 1x47μF 2x47μF 4x47μF 6x47μF 10x47μF
R_TUNE
33
33
33
33
33
C_TUNE 6800pF 15nF 33nF 47nF 56nF
Table 3. Recommended values of R_TUNE and C_TUNE
to obtain transient deviation of ≤2% of Vout for a
1.5A step load with Vin=5V.
Vo 3.3V 2.5V
Co
1x
47μF
2x
47μF
R_TUNE
33
C_TUNE 6800pF
ΔV 59mV
33
15nF
35mV
1.8V
2x
47μF
33
15nF
35mV
1.2V
4x
47μF
33
33nF
21mV
0.6V
2 x 47μF
+330μF
Polymer
33
82nF
12mV
Table 4. General recommended values of of R_TUNE
and C_TUNE for Vin=3.3V and various external
ceramic capacitor combinations.
Co 1x47μF 2x47μF 4x47μF 6x47μF 10x47μF
R_TUNE
C_TUNE
33
15nF
33
27nF
33
47nF
33
56nF
33
68nF
Table 5. Recommended values of R_TUNE and C_TUNE
to obtain transient deviation of ≤2% of Vout for a
1.5A step load with Vin=3.3V.
Vo 2.5V
1.8V
1.2V
Co 2 x 47μF 2 x 47μF 4 x 47μF
R_TUNE
C_TUNE
ΔV
33
22nF
46mV
33
27nF
32mV
33
47nF
24mV
0.6V
4 x 47μF
+330μF
Polymer
33
150nF
12mV
LINEAGE POWER
16