Datasheet

0.00001 0.0001 0.001 0.01 0.1 1
I -OutputCurrent- A
O
V =2.3V
I
0
10
20
30
40
50
60
70
80
90
100
Efficiency-%
V =2.7V
I
V =3.3V
I
V =3.6V
I
V =4.2V
I
V =5V,
I =max
O
LIM
V =5.5V
I
V =6V
I
0.00001 0.0001 0.001 0.01 0.1 1
I -OutputCurrent- A
O
0
10
20
30
40
50
60
70
80
90
100
Efficiency-%
V =5V,
I =max
O
LIM
TPS61251
www.ti.com SLVSAF7 –SEPTEMBER 2010
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
DESCRIPTION FIGURE
Efficiency vs Output current (V
OUT
= 5.5 V, I
LIM
= 1.5 A, R1 = 2320 kΩ and R2 = 649 kΩ) Figure 1
vs Output current in 100% Duty-Cycle Mode (V
OUT
= 5.5V, I
LIM
= 1.5 A, R1 = 2320 kΩ
Figure 2
and R2 = 649 kΩ)
vs Input voltage (V
OUT
= 5.5V, I
LOAD
= {0.01;0.1; 1.0; 10; 100; 500 mA}, R1 = 2320 kΩ
Figure 3
and R2 = 649 kΩ)
vs Input voltage (V
OUT
= 5.5 V, I
LIM
= {100; 200; 500; 1000; 1500 mA}, R1 = 1000 kΩ
Maximum output current Figure 4
and R2 = 280 kΩ)
Output voltage vs Output current (V
OUT
= 5.5 V, I
LIM
= 1.5 A, R1 = 1000 kΩ and R2 = 280 kΩ) Figure 5
Load transient response (Tantal Capacitor 2.3mF with >60 mΩ ESR, V
OUT
= 5.5V, V
IN
Figure 6
= 3.6V, I
LIM
= 1000mA, Load change from 50 mA to 550 mA)
Load transient response (6 x 330uF Polymer Tantal <5 mΩ ESR in total, V
OUT
= 5.5V,
Figure 7
Waveforms
V
IN
= 3.6V, I
LIM
= 1000mA, Load change from 500 mA to 1500 mA)
Startup after enable (V
OUT
= 5.5V, V
IN
= 3.6V, I
LIM
= 1000mA) Figure 8
Startup after enable (V
OUT
= 5.5V, V
IN
= 3.6V, I
LIM
= 500mA) Figure 9
EFFICIENCY
EFFICIENCY vs
vs OUTPUT CURRENT IN 100%
OUTPUT CURRENT DUTY-CYCLE MODE
Figure 1. Figure 2.
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