Manual

MAX5090A/B/C
2A, 76V, High-Efficiency MAXPower Step-Down
DC-DC Converters
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
IN
= 12V, V
ON/OFF
=12V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the Typical
Operating Circuit, if applicable.)
MAX5090 toc19
LOAD-TRANSIENT RESPONSE
(MAX5090AATE)
V
OUT
= 3.3V
A: V
OUT
, 200mV/div, AC-COUPLED
B: I
OUT
, 500mA/div, 0.1A TO 1A
400µs/div
A
B
LX WAVEFORMS
(MAX5090AATE)
MAX5090 toc20
V
OUT
= 3.3V
A
B
A: SWITCH VOLTAGE (LX PIN), 20mV/div (V
IN
= 48V)
B: INDUCTOR CURRENT, 2A/div (I
0
= 2A)
4µs/div
0
MAX5090 toc21
LX WAVEFORMS
(MAX5090AATE)
V
OUT
= 3.3V
A: SWITCH VOLTAGE, 20V/div (V
IN
= 48V)
B: INDUCTOR CURRENT, 200mA/div (I
0
= 75mA)
4µs/div
A
B
MAX5090 toc22
LX WAVEFORM
(MAX5090AATE)
V
OUT
= 3.3V
A: SWITCH VOLTAGE, 20V/div (V
IN
= 48V)
B: INDUCTOR CURRENT, 200mA/div (I
OUT
= 0)
4µs/div
A
B
MAX5090 toc23
STARTUP WAVEFORM
(I
OUT
= 0)
A: V
ON/OFF
, 2V/div
B: V
OUT
, 1V/div
4ms/div
A
B
C
SS
= 0.047µF
MAX5090 toc24
STARTUP WAVEFORM
(I
OUT
= 2A)
A: V
ON/OFF
, 2V/div
B: V
OUT
, 1V/div
4ms/div
A
B
C
SS
= 0.047µF
1.0
3.0
2.0
5.0
4.0
6.0
7.0
6.5 36 4616 26 56 66 76
PEAK SWITCH CURRENT
vs. INPUT VOLTAGE
MAX5090 toc25
INPUT VOLTAGE (V)
PEAK SWITCH CURRENT (A)
MAX5090AATE
V
OUT
= 3.3V
5% DROP IN V
OUT
PULSED OUTPUT LOAD
MAX5090 toc26
SYNCHRONIZATION
f
SYNC
= 119kHz
SYNC
2V/div
LX
10V/div
2µs/div
MAX5090 toc27
f
SYNC
= 200kHz
SYNCHRONIZATION
1µs/div
SYNC
2V/div
LX
10V/div