sc171mltr Semtech Corporation, sc171mltr Datasheet - Page 8

• Manufacturer Part Number: sc171mltr
• Description: 1a Ecospeedtm Synchronous Step-down Regulator With Optional Ultrasonic Power Save
• Manufacturer: Semtech Corporation

Typical Characteristics
© 2010 Semtech Corporation
95.0
90.0
85.0
80.0
75.0
70.0
65.0
60.0
55.0
50.0
95.0
90.0
85.0
80.0
75.0
70.0
65.0
60.0
55.0
50.0
100.0
95.0
90.0
85.0
80.0
75.0
70.0
65.0
0
0
0
Efficiency vs Output Current
Efficiency vs Output Current
Vin=5V, Vo=1.2V,
L
C
R
Red: PSAVE Mode
Blue: Forced Continuous PWM Mode
Efficiency vs Output Current
OUT
OUT
TON
0.25
0.25
: DS86C-B992AS-2R0N
Vin=5V, Vo=3.3V,
L
C
R
Red: PSAVE Mode
Blue: Forced Continuous PWM Mode
=22 m F+0.1 m F
= 24.9kOhm
OUT
OUT
TON
0.25
Output Current (A)
Output Current (A)
Vo=1.2V, R
L
C
Forced Continuous Mode
Red:Vin = 3.5V
Green: Vin = 4.0V
Blue: Vin = 5.0V
OUT
OUT
Output Current (A)
: DS86C-B992AS-2R0N,
=22 m Fx2
= 90.9kOhm
: DS86C-B992AS-2R0N
:22 m F+0.1 m F
0.5
0.5
0.5
TON
= 24.9kOhm
0.75
0.75
0.75
1
1
1
3.362
3.356
3.350
3.344
3.338
3.332
3.326
3.320
1.224
1.223
1.222
1.221
1.220
1.219
1.218
1.217
1.216
1.225
1.223
1.220
1.218
1.215
1.213
1.210
0
0
0
Output Voltage vs Output Current
Output Voltage vs Output Current
Output Voltage vs Output Current
Blue: Forced Continuous PWM Mode
Red: PSAVE Mode
Black: Vin = 3.5V
Red: Vin = 4V
Blue: Vin = 5.0V
0.25
0.25
0.25
Vin=5V, Vo=1.21V,
L
C
R
Red: PSAVE Mode
Blue: Forced Continuous PWM
Mode
Output Current (A)
Output Current (A)
Output Current (A)
OUT
OUT
TON
Vo=1.21V, R
C
L
Forced Continuous Mode
Black: Vin = 3.5V
OUT
OUT
: DS86C-B992AS-2R0N
=22 m F+0.1 m F
= 24.9kOhm
Vin=5V, Vo=3.3V,
L
C
R
: DS86C-B992AS-2R0N,
:22 m F+0.1 m F
OUT
OUT
TON
0.5
0.5
: DS86C-B992AS-2R0N
=22 m Fx2
0.5
= 90.9kOhm
TON
=24.9kOhm
0.75
0.75
0.75
1
1
1
SC171
8