MAX849 MAXIM [Maxim Integrated Products], MAX849 Datasheet - Page 5

• 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
1.252
1.251
1.250
1.249
1.248
= +25°C, unless otherwise noted.)
100
90
80
70
60
50
40
14
12
10
8
6
4
2
0
-40
0.1
0
T
V
A
IN
EFFICIENCY vs. LOAD CURRENT
-20
= -40°C
NO-LOAD BATTERY CURRENT
= 2.4V
1
REFERENCE VOLTAGE
V
1
IN
vs. TEMPERATURE
vs. INPUT VOLTAGE
V
T
0
IN
LOAD CURRENT (mA)
A
TEMPERATURE (°C)
= 0.9V
T
INPUT VOLTAGE (V)
A
2
= +85°C
(V
= 1.2V
= +25°C
_______________________________________________________________________________________
OUT
MAX849
20
10
3
= 3.3V)
40
Low-Noise, Step-Up DC-DC Converters
4
60
PFM
PWM
100
5
80
100
1000
6
1.252
1.250
1.248
1.246
1.244
1.242
1.240
1.238
100
90
80
70
60
50
40
30
18
16
14
12
10
8
6
4
2
0
0.1
0
0
V
1-Cell to 3-Cell, High-Power,
IN
INCLUDES ALL EXTERNAL
COMPONENT LEAKAGES.
CAPACITOR LEAKAGE
DOMINATES AT
T
EFFICIENCY vs. LOAD CURRENT
A
10
= 2.4V
= +85°C
1
vs. REFERENCE CURRENT
1
REFERENCE VOLTAGE
20
REFERENCE CURRENT ( A)
SHUTDOWN CURRENT
T
V
V
vs. INPUT VOLTAGE
A
IN
IN
LOAD CURRENT (mA)
= +85°C
INPUT VOLTAGE (V)
= 1.2V
= 3.6V
2
30
(V
MAX849
OUT
10
T
40
A
3
Typical Operating Characteristics
= 5V)
= +25°C
50
4
PFM
PWM
100
60
T
A
= -40°C
5
70
1000
80
6
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
-0.05
-0.15
-0.25
100
0.25
0.15
0.05
90
80
70
60
0.01
0.1
START-UP VOLTAGE vs. LOAD CURRENT
0.1875
EFFICIENCY vs. LOAD CURRENT
vs. FULL-SCALE INPUT VOLTAGE
T
A
(V
0.1
V
= -40°C
AIN1
FULL-SCALE INPUT VOLTAGE (V)
IN
OUT
AIN2
ADC LINEARITY ERROR
V
= 2.4V
1
IN
LOAD CURRENT (mA)
LOAD CURRENT (mA)
= 0.9V
= 3.3V, PWM MODE)
(V
V
0.4375
1
OUT
T
MAX848
IN
A
= 1.2V
= +25°C
10
= 3.3V)
10
0.6875
PFM
PWM
T
A
100
= +85°C
100
0.9375
1000
1000
5