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LT1934IS6-1 Datasheet

  • LT1934IS6-1

  • Micropower Step-Down Switching Regulators in ThinSOT

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LT1934/LT1934-1
Micropower Step-Down
Switching Regulators
in ThinSOT
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Wide Input Voltage Range: 3.2V to 34V
Micropower Operation: I
Q
= 12碌A(chǔ)
5V at 250mA from 6.5V to 34V Input (LT1934)
5V at 60mA from 6.5V to 34V Input (LT1934-1)
3.3V at 250mA from 4.5V to 34V Input (LT1934)
3.3V at 60mA from 4.5V to 34V Input (LT1934-1)
Low Shutdown Current: <1碌A(chǔ)
Low V
CESAT
Switch: 200mV at 300mA
Low Profile (1mm) SOT-23 (ThinSOT
TM
) Package
APPLICATIO S
s
s
s
s
s
The LT
廬
1934 is a micropower step-down DC/DC con-
verter with internal 400mA power switch, packaged in a
low profile (1mm) ThinSOT. With its wide input range of
3.2V to 34V, the LT1934 can regulate a wide variety of
power sources, from 4-cell alkaline batteries and 5V logic
rails to unregulated wall transformers and lead-acid bat-
teries. Quiescent current is just 12碌A(chǔ) and a zero current
shutdown mode disconnects the load from the input
source, simplifying power management in battery-pow-
ered systems. Burst Mode
廬
operation and the low drop
internal power switch result in high efficiency over a broad
range of load current.
The LT1934 provides up to 300mA of output current. The
LT1934-1 has a lower current limit, allowing optimum
choice of external components when the required output
current is less than 60mA. Fast current limiting protects
the LT1934 and external components against shorted
outputs, even at 34V input.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Wall Transformer Regulation
Automotive Battery Regulation
Standby Power for Portable Products
Distributed Supply Regulation
Industrial Control Supplies
TYPICAL APPLICATIO
3.3V Step-Down Converter
D2
100
LT1934
V
IN
= 12V
BOOST
V
IN
4.5V TO 34V
V
IN
LT1934
SHDN
GND
FB
SW
0.22碌F
EFFICIENCY (%)
L1
47碌H
90
C2
2.2碌F
D1
10pF
1M
V
OUT
3.3V
250mA
80
V
OUT
= 3.3V
70
+
ON OFF
C1
100碌F
604k
60
C1: SANYO 4TPB100M
C2: TAIYO YUDEN GMK325BJ225MN
D1: ON SEMICONDUCTOR MBR0540
D2: CENTRAL CMDSH-3
L1: SUMIDA CDRH4D28-470
1934 TA01
50
0.1
U
Efficiency
V
OUT
= 5V
1
10
100
LOAD CURRENT (mA)
1934 TA02
U
U
1934f
1

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