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LTC1911-15 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC1911-15
Description  Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1911-15 Datasheet(HTML) 4 Page - Linear Technology

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4
LTC1911-1.5/LTC1911-1.8
sn1911 1911is
TYPICAL PERFOR A CE CHARACTERISTICS
Start-Up Time
vs Soft-Start Capacitor
Output Ripple
vs Output Load Current
Output Current Transient Response
Line Transient Response
SOFT-START CAPACITOR (nF)
0.1
0.1
1
10
100
110
1911 G10
100
TA = –40°C
TA = 25°C
TA = 85°C
VIN = 3.6V
4V
3V
VIN
500mV/DIV
VOUT
20mV/DIV
IOUT = 225mA
20
µs/DIV
1911 G14
250mA
25mA
IOUT
VOUT
20mV/DIV
VIN = 3.6V
10
µs/DIV
1911 G13
VIN (Pin 1): Input Supply Voltage. VIN may be between
2.7V and 5.5V. Suggested bypass for VIN is a 10µF (1µF
min) ceramic low ESR capacitor.
C2+ (Pin 2): Flying Capacitor Two Positive Terminal.
C2 (Pin 3): Flying Capacitor Two Negative Terminal.
GND (Pin 4): Ground. Connect to a ground plane for best
performance.
C1(Pin 5): Flying Capacitor One Negative Terminal.
VOUT (Pin 6): Regulated Output Voltage. VOUT is discon-
nected from VIN during shutdown. Bypass VOUT with a
≥10µF ceramic low ESR capacitor (4µF min, ESR < 0.1Ω
max).
C1+ (Pin 7): Flying Capacitor One Positive Terminal.
PI FU CTIO S
SS/SHDN (Pin 8): Soft-Start/Shutdown Control Pin. This
pin is designed to be driven with an external open-drain
output. Holding the SS/SHDN pin below 0.3V will force
the LTC1911-X into shutdown mode. An internal pull-up
current of 2
µA will force the SS/SHDN voltage to climb to
VIN once the device driving the pin is forced into a Hi-Z
state. To limit inrush current on start-up, connect a
capacitor between the SS/SHDN pin and GND. Capaci-
tance on the SS/SHDN pin will limit the dV/dt of the pin
during turn on which, in turn, will limit the dV/dt of VOUT.
By selecting an appropriate soft-start capacitor, the user
can control the inrush current for a known output capaci-
tor during turn-on (see Application Information). If nei-
ther of the two functions are desired, the pin may be left
floating or tied to VIN.
LTC1911-1.8 Output Voltage Ripple
VOUT
50mV/DIV
2-TO-1 MODE
VIN = 5V
IOUT = 250mA
100ns/DIV
1911 G12
ALL WAVEFORMS AC COUPLED
OUTPUT LOAD CURRENT (mA)
0
0
5
10
15
20
30
50
100
150
200
1911 G11
250
300
25
TA = 4.7µF
TA = 10µF
TA = 22µF
VOUT
50mV/DIV
3-TO-2 MODE
VIN = 3.6V
VOUT
50mV/DIV
1-TO-1 MODE
VIN = 2.7V
VIN (V)
2.5
1.40
1.45
1.50
1.55
1.60
3.0
3.5
4.0
4.5
1911 G15
5.0
5.5
TA = –40°C
TA = 25°C
TA = 85°C
Oscillator Frequency
vs Supply Voltage


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