MAX1686 Datasheet, PDF (4/12 Pages) Maxim Integrated Products – Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM

Step-Up DC-DC Converters with Precise,
Adaptive Current Limit for GSM
_____________________________Typical Operating Characteristics (continued)
(V_IN = +3.3V, V_OUT = 5V, V_LIM = 1V, Figures 6b and 7, T_A = +25°C, unless otherwise noted.)
MAX1688 PEAK BATTERY CURRENT
vs. R_CHG (1A GSM LOAD)
800
700
600
500
400
300
200
100
0
15
20
25
30
35
40
R_CHG (kΩ)
NO-LOAD BATTERY INPUT CURRENT vs.
TEMPERATURE (V_OUT = 5V, V_LIM = 1V )
4.5
4.0
V_IN = 6V
3.5
3.0
2.5
2.0
1.5
-40 -20
V_IN = 5V
V_IN = 3.3V
V_IN = 2.7V
0 20 40 60 80 100
TEMPERATURE (°C)
REFERENCE VOLTAGE vs. REFERENCE
CURRENT (V_IN = 3.3V, V_OUT = 5V)
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
1
10
100
1000
I_REF (µA)
REFERENCE VOLTAGE vs. TEMPERATURE
(V_IN = 3.3V, V_OUT = 5V)
1.253
SWITCHING FREQUENCY vs. INDUCTANCE
(V_IN = 3.3V, V_OUT = 5V,
I_LOAD = 100mA, V_LIM = 1V)
1200
1000
1.251
800
1.249
600
400
1.247
200
1.245
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
0
1
10
100
INDUCTANCE (µH)
800
750
700
650
600
550
500
450
400
350
300
100
MAX1688
I_PEAK vs. V_OUT DROOP
R_CHG = 40.2k
150 200 250 300 350 400
V_OUT DROOP (mV)
MAX1688 PEAK INDUCTOR CURRENT
vs. R_CHG (1A GSM LOAD)
800
700
600
500
400
300
200
100
0
15
20
25
30
35
40
R_CHG (kΩ)
4 _______________________________________________________________________________________