Rainbow Electronics MAX1688 User Manual
Page 11
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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)
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