MAX849 MAXIM [Maxim Integrated Products], MAX849 Datasheet - Page 7

• Manufacturer Part Number: MAX849
• Description: 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters
• Manufacturer: MAXIM [Maxim Integrated Products]

(T
A
= +25°C, unless otherwise noted.)
A
B
V
A = V
B = LOAD CURRENT, 100mA TO 1A, 0.5A/div,
IN
PULSE WIDTH = 577 s
= 3.6V, V
OUT
380
360
340
320
300
280
GSM LOAD-TRANSIENT RESPONSE
RIPPLE, 200mV/div, AC COUPLED
-40
OUT
_______________________________________________________________________________________
MAX849 INTERNAL OSCILLATOR
FREQUENCY vs. TEMPERATURE
= 5V, C
-20
Low-Noise, Step-Up DC-DC Converters
OUT
0
MAX849
TEMPERATURE (°C)
1ms/div
= 440 F
2.7
20
0
0.1k
V
OUT
40
V
= 3.3V
OUT
= 5V
60
MAX848/9 TOC-14
80
1k
Typical Operating Characteristics (continued)
(V
100
OUT
5V
0A
1-Cell to 3-Cell, High-Power,
= 3.3V, V
MAX849 NOISE SPECTRUM
FREQUENCY (Hz)
10k
IN
= 1.2V, R
LOAD
= 50 )
100k
A
B
V
A = V
B = LOAD CURRENT, 50mA TO 400mA, 0.2A/div,
IN
= 1.2V, V
PULSE WIDTH = 416 s
2.0
1.8
1.7
1.6
1.5
1.4
1.3
1.2
OUT
2.5
DECT LOAD-TRANSIENT RESPONSE
RIPPLE, 200mV/div, AC COUPLED
MAX849 PEAK INDUCTOR CURRENT
OUT
3.0
= 3.3V, C
1M
vs. OUTPUT VOLTAGE
OUTPUT VOLTAGE (V)
3.5
MAX849
OUT
2ms/div
= 440 F
4.0
4.5
MAX848/9 TOC-15
5.0
5.5
3.3V
0A
7