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LT3433 Datasheet(PDF) 5 Page - Linear Technology

Part # LT3433
Description  High Voltage Step-Up/Step-Down DC/DC Converter
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3433 Datasheet(HTML) 5 Page - Linear Technology

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5
LT3433
3433f
PI FU CTIO S
the switch transistor.This pin also supplies power to most
of the IC’s internal circuitry if the VBIAS pin is not driven
externally. This supply will be subject to high switching
transient currents so this pin requires a high quality bypass
capacitor that meets whatever application-specific input
ripple current requirements exist.
BURST_EN (Pin 5): Burst Mode Enable/Disable. When
this pin is below 0.3V, Burst Mode operation is enabled.
Pin input bias current < 1
µA when Burst Mode operation
is enabled. If Burst Mode operation is not desired, pulling
this pin above 2V will disable the burst function. When
Burst Mode operation is disabled, typical pin input current
= 35
µA. BURST_EN should not be pulled above 20V. This
pin is typically shorted to SGND for Burst Mode function,
or connected to either VBIAS or VOUT to disable Burst Mode
operation.
VC (Pin 6): Error Amplifier Output. The voltage on the VC
pin corresponds to the maximum switch current per oscil-
lator cycle. The error amplifier is typically configured as an
integrator circuit by connecting an RC network from this
pin to ground. This circuit typically creates the dominant
pole for the converter regulation feedback loop. Specific in-
tegrator characteristics can be configured to optimize tran-
sient response. See Applications Information.
SGND (Pins 1, 8, 9, 16): Low Noise Ground Reference.
VBST (Pin 2): Boosted Switch Supply. This “boosted” sup-
ply rail is referenced to the SW_H pin. Supply voltage is
maintained by a bootstrap capacitor tied from the VBST pin
to the SW_H pin. A 1
µF capacitor is generally adequate for
most applications.
The charge on the bootstrap capacitor is refreshed through
a diode, typically connected from the converter output
(VOUT), during the switch-off period. Minimum off-time
operation assures that the boost capacitor is refreshed each
switch cycle. The LT3433 supports operational VBST sup-
ply voltages up to 75V (absolute maximum) as referenced
to ground.
SW_H (Pin 3): Boosted Switch Output. This is the current
return for the boosted switch and corresponds to the emitter
of the switch transistor. The boosted switch shorts the
SW_H pin to the VIN supply when enabled. The drive cir-
cuitry for this switch is boosted above the VIN supply
through the VBST pin, allowing saturation of the switch for
maximum efficiency. The “ON” resistance of the boosted
switch is 0.8
Ω.
VIN (Pin 4): Input Power Supply. This pin supplies power
to the boosted switch and corresponds to the collector of
TYPICAL PERFOR A CE CHARACTERISTICS
VBST Supply Switch Drive Current
vs Temperature (ISW = 500mA)
Switch Resistance
vs Temperature (ISW = 500mA)
TEMPERATURE (
°C)
–50
0.8
0.9
1.1
25
75
3433 G12
0.7
0.6
–25
0
50
100
125
0.5
0.4
1.0
RSWH
RSWL
TEMPERATURE (
°C)
–50
–25
31
34
3433 G13
28
25
0
50
100
25
75
125
40
37
TEMPERATURE (
°C)
–50
31
34
3433 G14
28
25
0
50
100
–25
25
75
125
40
37
VOUT Supply Switch Drive Current
vs Temperature (ISW = 500mA)


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