MAX1765EUE-T Maxim Integrated Products, MAX1765EUE-T Datasheet - Page 8

• Manufacturer Part Number: MAX1765EUE-T
• Description: DC/DC Switching Converters 800mA Step-Up w/500mA Linear Reg
• Manufacturer: Maxim Integrated Products

800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
(T
8
A
= +25°C, unless otherwise noted.)
-10
-20
-30
-40
-50
-60
-70
-80
_______________________________________________________________________________________
0
B
A
0.1
I = 0mA, V
A: V
B: V
IN
OUT
, 2V/div
LINE TRANSIENT RESPONSE
, 5mV/div, AC-COUPLED
LDO PSRR vs. FREQUENCY
IN
1
= +3V TO +5V, V
(100Hz TO 1MHz)
FREQUENCY (kHz)
(LINEAR)
A
B
C
10
A: 0NA, 5V/div
B: INPUT CURRENT, 100mA/div
C: V
OUT
OUT
= +3.3V
(R
, 1V/div
SOFT-START WAVEFORMS
100
SS
= 500kΩ, C
MAX1765 toc13
2.5ms/div
1000
SS
= 0.1µF)
16
14
12
10
Typical Operating Characteristics (continued)
6
8
4
2
0
B
A
MAX1765 toc15b
0.1
V
A: I
B: V
IN
V
V
IN
OUT
OUT
= +2.4V, V
OUT
= +2.4V
, 500mA/div
= +3.3V
LOAD TRANSIENT RESPONSE
,100mV/div
OUTPUT NOISE SPECTRUM
BOOST FOLLOWED BY LDO
OUT
FREQUENCY (MHz)
= +3.3V, I
50µs/div
1
OUT
= 0 TO 500mA
MAX1765 toc14
10
A
B
C
(I
A: LX, 5V/div
B: INDUCTOR CURRENT, 200mA/div
C: OUTPUT RIPPLE, 50mV/div, AC-COUPLED
HEAVY-LOAD SWITCHING WAVEFORMS
OUT
= 650mA, V
A
B
A
B
C
A: 0NA, 5V/div
B: V
C: INPUT CURRENT, 1A/div
A: V
B: V
OUT
IN
OUT
NO SOFT-START COMPONENTS
, 500mV/div
, 2V/div
LINE TRANSIENT RESPONSE
500ns/div
, 1mV/div, AC-COUPLED
IN
TURN-ON WAVEFORMS
= +2.4V, V
(DC-DC)
100µs/div
OUT
MAX1765 toc16
= 3.3V)
V
V
OUT
IN
MAX1765 toc15a
= +1.4V TO +2.4V
= +3.3V, I = 0mA
MAX1765 toc12