Rainbow Electronics MAX1688 - Manual (Page 11)

MAX1687/MAX1688
Step-Up DC-DC Converters with
Precise, Adaptive Current Limit for GSM
______________________________________________________________________________________________________ 11
OUT
OUT IN
IN
0.1 µ F 47 µ F
V IN
2.7V TO 6V
R CHG
40.2k
10 µ H
2000 µ F
R2
187k
R1
61.9k
LX1
LX1
LX2
LX2
ON ON
OFF
REF
CHG FB
AGND
PGND
PGND
V OUT = 5V
2A AT 12%
DUTY CYCLE MAX1688
Figure 7. MAX1688 Typical Application Circuit (GSM Pulsed Load)
V OUT = 5V
350mA
OUT
OUT IN
IN
0.1 µ F 47 µ F
V IN
2.7V TO 6V
10 µ H
47 µ F
R2
187k
R1
61.9k
LX1
LX1
LX2
LX2
ON ON
OFF
LIM
REF* FB
AGND
PGND
PGND
*TSSOP PACKAGE ONLY
MAX1687
Figure 6b. MAX1687 Typical Application Circuit (Fixed Non-Pulsed Load)