Datasheet

TPS65720
TPS65721
SLVS979 –OCTOBER 2009 www.ti.com
PIN FUNCTIONS for QFN VERSION (RSN package) (continued)
PIN
I/O DESCRIPTION
NAME NO.
RESET 14 O Open drain output of the reset generator; This output goes active LOW when the input voltage at
pin THRESHOLD falls below the threshold voltage.
THRESHOLD 3 I Input voltage to the reset comparator. When the input voltage falls below the threshold, the RESET
output is actively pulled LOW.
GPIO0 7 I/O General purpose I/O
GPIO1 6 I/O General purpose I/O
GPIO2 5 I/O General purpose I/O or 5mA current source
GPIO3 4 I/O General purpose I/O or 5mA current source
MODE 11 I Pull HIGH to force the DCDC1 converter to PWM mode.
GND 29 – Connect to AGND and PGND
PowerPad – Connect to GND
PARAMETER MEASUREMENT INFORMATION
Setup
The graphs have been generated on the TPS65720YFF EVM with the inductors as mentioned in the
graphs. See the TPS65720 EVM users guide (SLVU324) for details on the layout.
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
FIGURE
TPS65720: Efficiency DCDC1 vs Load current / PWM mode Vo = 2.05V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 1
200mA; L= Murata LQM21P 3.3 μH
TPS65720: Efficiency DCDC1 vs Load current / PFM mode Vo = 2.05V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 2
200mA; L= Murata LQM21P 3.3 μH
TPS65720: Efficiency DCDC1 vs Load current / PWM mode Vo = 2.05V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 3
200mA; L= FDK MIPSA2520 2.2 μH
TPS65720: Efficiency DCDC1 vs Load current / PFM mode Vo = 2.05V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 4
200mA; L= FDK MIPSA2520 2.2 μH
TPS65721: Efficiency DCDC1 vs Load current / PWM mode; L= Vo = 3.3V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 5
FDK MIPSA2520 2.2 μH
TPS65721: Efficiency DCDC1 vs Load current / PFM mode Vo = 3.3V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 6
500mA; L= FDK MIPSA2520 2.2 μH
TPS65721: Efficiency DCDC1 vs Load current / PWM mode; L= Vo = 1.8V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 7
FDK MIPSA2520 2.2 μH
TPS65721: Efficiency DCDC1 vs Load current / PFM mode Vo = 1.8V; Vi = 3.0V, 3.6V, 4.2V, 5.0V Figure 8
500mA; L= FDK MIPSA2520 2.2 μH
Load transient response DCDC1; Scope plot Figure 9
L= FDK MIPSA2520 2.2 μH, PFM mode Io = 20mA to 180mA; Vo = 2.05V; Vi =
3.6V
Load transient response DCDC1; Scope plot Figure 10
L =FDK MIPSA2520 2.2 μH, PWM mode Io = 50 μA to 60mA; Vo = 2.05V; Vi =
3.6V
Load transient response DCDC1; Scope plot Figure 11
L= FDK MIPSA2520 2.2 μH, PWM mode Io = 40mA to 360mA; Vo = 3.3V; Vi =
3.6V
Line transient response DCDC1; Scope plot; Vo = 2.05V Figure 12
L= FDK MIPSA2520 2.2 μH, PWM mode Vi = 3.6V to 5V to 3.6V; Io = 60mA
Output voltage ripple in PFM mode; DCDC1 Scope plot: Vi = 3.6V Figure 13
Vo = 2.05V;
Io = 50μA (PFM); Io = 60mA (PWM)
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