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LTC3528EDDB#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC3528/LTC3528B
4
3528fd
LOAD CURRENT (mA)
0.01
80
90
100
100
3528 G03
70
60
0.1 1 10 1000
50
40
30
100
1000
10
1
0.1
EFFICIENCY (%)
POWER LOSS (mW)
V
IN
= 1.2V
V
IN
= 2.4V
V
IN
= 3.6V
V
IN
= 4.2V
EFFICIENCY
POWER
LOSS
No-Load Input Current vs V
IN
(LTC3528)
Maximum Output Current vs V
IN
Minimum Load Resistance During
Start-Up vs V
IN
Start-Up Delay Time vs V
IN
Burst Mode Threshold Current
vs V
IN
Efficiency vs Load Current and V
IN
for V
OUT
= 5V (LTC3528)
Efficiency vs Load Current and V
IN
for V
OUT
= 3.3V (LTC3528)
LOAD CURRENT (mA)
0.01
80
90
100
100
3528 G02
70
60
0.1 1 10 1000
50
40
30
100
1000
10
1
0.1
0.01
EFFICIENCY (%)
POWER LOSS (mW)
V
IN
= 1.2V
V
IN
= 1.8V
V
IN
= 2.4V
V
IN
= 3V
EFFICIENCY
POWER
LOSS
V
IN
(V)
1
10
I
IN
(µA)
30
50
70
90
110
130
2 3 4 5
3528 G04
V
OUT
= 1.8V
V
OUT
= 3V
V
OUT
= 3.3V
V
OUT
= 5V
V
IN
(V)
1
I
OUT
(mA)
700
2.5
3528 G05
400
200
1.5 2 3
100
0
800
600
500
300
3.5 4 4.5
V
OUT
= 1.8V
V
OUT
= 3.3V
V
OUT
= 5V
V
IN
(V)
0.7
10
R
LOAD
(Ω)
1000
100
10000
0.8 0.9 1
3528 G06
V
IN
(V)
1
DELAY (µs)
120
2.5
3528 G07
90
70
1.5 2 3
60
50
130
110
100
80
3.5 4 4.5
V
IN
(V)
1
I
OUT
(mA)
20
30
1.4
3528 G08
10
0
1.1
1.2
1.3
1.5
40
V
OUT
= 1.8V
ENTER BURST
EXIT BURST
V
IN
(V)
1
I
OUT
(mA)
20
30
3528 G09
10
0
1.5
V
OUT
= 3V
2
2.5
50
40
ENTER BURST
EXIT BURST
V
IN
(V)
1
0
I
OUT
(mA)
20
40
60
1.5 2
3528 G10
2.5 3
V
OUT
= 3.3V
ENTER BURST
EXIT BURST
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Burst Mode Threshold Current
vs V
IN
Burst Mode Threshold Current
vs V
IN
LTC3528/LTC3528B
5
3528fd
TEMPERATURE (°C)
–50 –25
600
START-UP VOLTAGE (mV)
700
850
0
50
75
3528 G17
650
800
750
25
100
125
V
OUT
(V)
1
10.5
CURRENT (µA)
11.5
12.5
13.5
2 3
3528 G18
4 5
V
IN
= 1.2V
Oscillator Frequency Change
vs V
OUT
R
DS(ON)
vs V
OUT
Oscillator Frequency Change
vs Temperature
R
DS(ON)
Change vs Temperature
V
FB
vs Temperature
Start-Up Voltage vs Temperature
Fixed Frequency V
OUT
Ripple and
Inductor Current Waveforms
Burst Mode Quiescent Current vs
V
OUT
(LTC3528)
V
IN
(V)
1
0
I
OUT
(mA)
20
40
60
2 3
3528 G11
4
V
OUT
= 5V
ENTER BURST
EXIT BURST
V
OUT
(V)
1.5
FREQUENCY CHANGE (%)
–1.50
0
0.25
0.50
2.5
3.5
4
3528 G12
–2.00
–0.50
–1.00
–1.75
–0.25
–2.25
–0.75
–1.25
2
3
4.5
5
NORMALIZED TO V
OUT
= 3V
V
OUT
(V)
1.5
300
350
450
3 4
3528 G13
250
200
2 2.5
3.5 4.5 5
150
100
400
R
DS(ON)
(mΩ)
PMOS
NMOS
TEMPERATURE (˚C)
–50
FREQUENCY CHANGE (%)
0
1
2
25 75
3528 G14
–1
–2
–25 0
50 100 125
–3
–4
TEMPERATURE (˚C)
–50
CHANGE (%)
20
30
40
25 75
3528 G15
10
0
–25 0
50 100 125
–10
–20
TEMPERATURE (°C)
–50
1.196
V
FB
(V)
1.197
1.198
1.199
1.200
–25 0 25 50
3528 G16
75 100 125
V
OUT
20mV/DIV
2µs/DIV
3528 G19
V
IN
= 1.2V
V
OUT
= 3.3V
C
OUT
= 22µF
C
FF
= 33pF
I
OUT
= 100mA
I
L
200mA/DIV
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Burst Mode Threshold Current
vs V
IN
LTC3528/LTC3528B
6
3528fd
PIN FUNCTIONS
Load Step Response (Fixed
Frequency, 1.2V to 3.3V)
Load Step Response (Burst Mode
Operation, 1.2V to 3.3V, LTC3528)
SHDN (Pin 1): Logic Controlled Shutdown Input. There is
an internal 4MΩ pull-down resistor on this pin.
•SHDN = High: Normal operation
•SHDN = Low: Shutdown, quiescent current < 1µA
FB (Pin 2): Feedback Input. Connect resistor divider tap
to this pin. The output voltage can be adjusted from 1.6V
to 5.25V by:
V
OUT
= 1.20V • 1+
R2
R1
PGOOD (Pin 3): Power Good Comparator Output. This
open-drain output is low when V
FB
< 10% from its regu-
lation voltage.
V
OUT
(Pin 4): Output Voltage Sense and Drain Connection
of the Internal Synchronous Rectifier. PCB trace length
from V
OUT
to the output filter capacitor (4.7µF minimum)
should be as short and wide as possible.
SW (Pin 5): Switch Pin. Connect inductor between SW
and V
IN
. Keep PCB trace lengths as short and wide as
possible to reduce EMI. If the inductor current falls to
zero, or SHDN is low, an internal anti-ringing switch is
connected from SW to V
IN
to minimize EMI.
PGND (Pin 6): Power Ground. Provide a short direct PCB
path between PGND and the (–) side of the input and
output capacitors.
Load Step Response (Fixed
Frequency, 3.6V to 5V)
Load Step Response (Burst Mode
Operation, 3.6V to 5V, LTC3528)
V
OUT
and I
IN
During Soft-Start
Burst Mode Waveforms
5µs/DIV
3528 G20
V
IN
= 3.6V
V
OUT
= 5V
C
OUT
= 22µF
C
FF
= 33pF
I
LOAD
= 30mA
V
OUT
20mV/DIV
INDUCTOR
CURRENT
100mA/DIV
V
OUT
1V/DIV
SHDN PIN
200µs/DIV
3528 G21
V
IN
= 1.2V
V
OUT
= 3.3V
C
OUT
= 10µF
L = 4.7µH
I
IN
200mA/DIV
V
OUT
100mV/DIV
20µs/DIV
3528 G22
V
IN
= 3.6V
V
OUT
= 5V
C
OUT
= 10µF
L = 4.7µH
LOAD
CURRENT
200mA/DIV
V
OUT
100mV/DIV
50µs/DIV
3528 G23
V
IN
= 3.6V
V
OUT
= 5V
C
OUT
= 10µF
L = 4.7µH
LOAD
CURRENT
200mA/DIV
V
OUT
100mV/DIV
50µs/DIV
3528 G24
V
IN
= 1.2V
V
OUT
= 3.3V
C
OUT
= 10µF
L = 4.7µH
LOAD
CURRENT
100mA/DIV
V
OUT
100mV/DIV
50µs/DIV
3528 G25
V
IN
= 1.2V
V
OUT
= 3.3V
C
OUT
= 10µF
L = 4.7µH
LOAD
CURRENT
100mA/DIV
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC3528EDDB#TRMPBF

Mfr. #:
Buy LTC3528EDDB#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1A, 1MHz Synch Boost converter w/ Output Disconnect in DFN
Lifecycle:
New from this manufacturer.
Delivery:
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