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ManualsBrandsLinear Technology ManualsDC / DC Adjustable Switching RegulatorsDC/DC Converter Step-Up/Step-Down TSSOP-2.7 ... 40V
31323334353637383940
LTC3115-1
33
31151fb
For more information www.linear.com/LTC3115-1
Typical applicaTions
Wide Input Voltage Range (2.7V to 40V), High Efficiency 300kHz, Low Noise 5V Regulator
BST1 BST2
PV
IN
V
IN
RUN
PV
OUT
VC
FB
27pF
PV
CC
PWM/SYNC
V
CC
RT
SW1 SW2
GND PGND
LTC3115-1
L1
33µH
D1
C
BST1
0.1µF
C
BST2
0.1µF
2.7V TO
40V
C
FF
82pF
C1
4.7µF
5V
1A V
IN
> 3.6V
2A V
IN
≥ 6V
C
IN
10µF
C
O
330µF
R
TOP
1M
R
BOT
249k
C
IN
: MURATA GRM55DR61H106K
C
O
: POSCAP 6TPB330M (7.3mm × 4.3mm × 2.8mm)
D1: PANASONIC MA785
L1: COILCRAFT MSS1260
31151 TA02a
R
T
121k
R
FF
249k
R
FB
93.1k
C
FB
3300pF
+
PWM Mode Efficiency
vs Load Current
V
OUT
Transient for a 0A to 2A Load Step, V
IN
= 24VV
OUT
Transient for a 0A to 1A Load Step
LOAD CURRENT (A)
0.01
70
EFFICIENCY (%)
75
80
85
90
0.1 1
31151 TA02b
65
60
55
50
95
100
V
IN
= 5V
V
IN
= 3.6V
V
IN
= 2.7V
PWM Mode Efficiency
vs Load Current
LOAD CURRENT (A)
0.01
70
EFFICIENCY (%)
75
80
85
90
0.1 1
31151 TA02c
65
60
55
50
95
100
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
OUT
(200mV/DIV)
V
OUT
(200mV/DIV)
V
OUT
(200mV/DIV)
V
OUT
(200mV/DIV)
2ms/DIV
31151 TA02d
V
IN
= 36V
V
IN
= 12V
V
IN
= 5V
V
IN
= 3.6V
V
OUT
(200mV/DIV)
INDUCTOR CURRENT
(2A/DIV)
LOAD CURRENT
(2A/DIV)
2ms/DIV
31151 TA02e
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