Datasheet

MAX1761
Small, Dual, High-Efficiency
Buck Controller for Notebooks
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
0
0.1
0.3
0.2
0.5
0.6
0.4
0.7
4.5 8.5 10.56.5 12.5 14.5 16.5 18.5 20.5
SUPPLY CURRENT vs. INPUT VOLTAGE
(SKIP MODE)
MAX1761 toc10
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
ON1 = VL, ON2 = VL
NO LOAD
C
B
A
20 µs/div
LOAD-TRANSIENT RESPONSE
(2.5A COMPONENTS, V
OUT
= 1.8V)
MAX1761 toc14
A: V
OUT
, AC-COUPLED, 5mV/div
B: INDUCTOR CURRENT, 1A/div
C: DL1, 5V/div
C
B
OUTPUT OVERLOAD WAVEFORMS
(I
OUT
= 4V, V
OUT
= 2.5V)
MAX1761 toc15
A: V
OUT
, 1V/div
B: INDUCTOR CURRENT, 2A/div
C: DL1, 2V/div
A
100 µs/div
C
B
A
STARTUP AND SHUTDOWN WAVEFORMS
(V
OUT
= 2.5V)
MAX1761 toc17
A: V
OUT
, 2V/div
B: INDUCTOR CURRENT, 2A/div
C: DL1, 5V/div
500 µs/div
C
B
A
20 µs/div
LOAD-TRANSIENT RESPONSE
(2.5A COMPONENTS, V
OUT
= 2.5V)
MAX1761 toc13
A: V
OUT
, AC-COUPLED, 10mV/div
B: INDUCTOR CURRENT, 1A/div
C: DL1, 5V/div
C
B
A
STARTUP AND SHUTDOWN WAVEFORMS
(V
OUT
= 1.8V)
MAX1761 toc16
A: V
OUT
, 2V/div
B: INDUCTOR CURRENT, 2A/div
C: DL1, 5V/div
500 µs/div
0
5
10
15
20
25
30
4.5 8.56.5 10.5 12.5 14.5 16.5 18.5 20.5
SUPPLY CURRENT vs. INPUT VOLTAGE
(PWM MODE)
MAX1761 toc11
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
ON1 = VL, ON2 = FLOAT
NO LOAD
0
2
1
4
3
5
6
7
8
4.5 8.5 10.56.5 12.5 14.5 16.5 18.5 20.5
NO-LOAD SUPPLY CURRENT vs.
INPUT VOLTAGE (SHUTDOWN)
MAX1761 toc12
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
ON1 = GND, 0N2 = VL