Datasheet

LT1934/LT1934-1
17
1934fe
TYPICAL APPLICATIONS
1.8V Step-Down Converter
BOOST
V
IN
LT1934
SHDN
1934 TA06
C2
2.2μF
0.1μF
C1: SANYO 2R5TPB100M
C2: TAIYO YUDEN EMK316BJ225ML
D1: ZETEX ZHCS400 OR ON SEMI MBR0540
D2: CENTRAL CMPD914
L1: SUMIDA CR43-330
V
OUT
1.8V
250mA
D2
332k
147k
L1
33μH
D1
V
IN
3.6V TO 16V
ON OFF
SW
FB
GND
C1
100μF
+
BOOST
V
IN
LT1934-1
SHDN
1934 TA08
1μF
D4
10V
C1
10pF
D1: ON SEMICONDUCTOR MBR0540
D2, D3: BAT54
D4: CENTRAL CMPZ5240B
L1: COILTRONICS CTX50-1
ZENER DIODE D4 PROVIDES AN UNDERVOLTAGE LOCKOUT,
REDUCING THE INPUT CURRENT REQUIRED AT START-UP
V
OUT
3V
9mA
ISOLATED
OUT
3V
3mA
D2
D3
715k
390k
1M
L1A
50μH
L1B
50μH
D1
V
IN
14V TO 32V
<3.6mA
SW
FB
GND
33μF
+
10μF
+
Loop Powered 3.3V Supply with Additional Isolated Output