MAX1536 Datasheet, PDF (6/19 Pages) Maxim Integrated Products – 3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control

3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-
Down Regulator with Dynamic Output Voltage Control
Typical Operating Characteristics (continued)
(MAX1536 Circuit of Figure 1, T_A = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE vs. OUTPUT CURRENT
(V_IN = 3.3V, L = 1.2μH)
1.806
R_TOFF = 75kΩ
1.804
1.802
1.800
1.798
IDLE MODE
PWM MODE
1.796
1.794
0.001
0.01
0.1
1
10
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
(V_OUT = 1.8V, f_SW = 300kHz)
100
90
80
70
60
V_IN = 3.3V
L = 2.2μH
50
R_TOFF = 147kΩ
40
30
20
10
0
0.001
V_IN = 5V
L = 3.3μH
R_TOFF = 221kΩ
PWM MODE
IDLE MODE
0.01
0.1
1
10
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
(V_IN = 3.3V, V_OUT = 1.8V)
100
90
80
70
60
50
40
30
20
10
0
0.001
L = 3.3μH
R_TOFF = 178kΩ
f_SW ≈ 250kHz
L = 1.5μH
R_TOFF = 85kΩ
f_SW ≈ 500kHz
L = 0.8μH
R_TOFF = 41.2kΩ
f_SW ≈ 1000kHz
PWM MODE
IDLE MODE
0.01
0.1
1
10
OUTPUT CURRENT (A)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (PWM MODE)
25
1.0 ^{MAX1536 toc08}
I_IN
20
V_OUT = 1.8V
0.8
15
0.6
10
0.4
I_CC
5
0.2
0
0
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
SWITCHING FREQUENCY vs. OUTPUT CURRENT
1000
900
V_IN = 5.0V
V_OUT = 1.8V
800
700
600
500
400
V_IN = 3.3V
300
200
100
0
0
PWM MODE
IDLE MODE
1
2
3
4
5
OUTPUT CURRENT (A)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (IDLE MODE)
1.05
350 ^{MAX1536 toc09}
1.04
V_OUT = 1.8V ₃₄₅
1.03
340
1.02
335
1.01
330
1.00
I_IN
0.99
0.98
325
320
I_CC
315
0.97
310
0.96
305
0.95
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
300
5.0
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