MAX1637 Datasheet, PDF (5/20 Pages) Maxim Integrated Products – Miniature, Low-Voltage, Precision Step-Down Controller

Miniature, Low-Voltage,
Precision Step-Down Controller
____________________________________Typical Operating Characteristics (continued)
(V_OUT = 3.3V, T_A = +25°C, unless otherwise noted.)
LOAD REGULATION
vs. LOAD CURRENT
10
8
6
4
2
0
-2
-4
-6
-8
REF LOAD-REGULATION ERROR
vs. REF LOAD CURRENT
0.6
0.5
0.4
0.3
0.2
0.1
DROPOUT VOLTAGE
vs. LOAD CURRENT
900
800
V_OUT FORCED TO 3.27V
SYNC = V_CC
700
600
500
400
300
200
100
-10
0
0
0.01
0.1
1
10
0 10 20 30 40 50 60 70 80 90 100
0.01
0.1
1
10
LOAD CURRENT (A)
REF LOAD CURRENT (µA)
LOAD CURRENT (A)
LOAD-TRANSIENT RESPONSE
(3.3V/3A, PWM MODE)
MAX1637 TOC11
LOAD-TRANSIENT RESPONSE
(1.8V, PWM MODE)
MAX1637 TOC12
V_OUT
50mV/div
V_OUT
50mV/div
4A
LOAD
2A ^CURRENT
0A
10A
5A LOAD CURRENT
0A
100µs/div
SWITCHING WAVEFORMS
(PWM MODE)
MAX1637-13
V_OUT
20mV/div
SWITCHING WAVEFORMS
(PFM MODE)
MAX1637-14
V_OUT = 1.7V
V_OUT
50mV/div
100µs/div
SWITCHING WAVEFORMS
DROPOUT OPERATION
MAX1637-15
SYNC = V_CC
V_OUT
10mV/div
1µs/div
5V
V_LX
0V
1A _INDUCTOR
0A ^CURRENT
20µs/div
5V
V_LX
0V
1A _INDUCTOR
0A ^CURRENT
V_OUT FORCED TO 3.27V
1µs/div
V_LX
2V/div
1A
INDUCTOR
0A ^CURRENT
_______________________________________________________________________________________ 5