LTC3829EFE#PBF Linear Technology, LTC3829EFE#PBF Datasheet - Page 26

• Manufacturer Part Number: LTC3829EFE#PBF
• Description: IC BUCK SYNC ADJ 38TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC3829EFE#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.6 ~ 5 V
• Frequency - Switching: 250kHz ~ 770kHz
• Voltage - Input: 4.5 ~ 38 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP Exposed Pad, 38-eTSSOP, 38-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

LTC3829
applicaTions inForMaTion
The final load slope is defined by the inductor current
sense resistors and the two external resistors mentioned
above.
In summary, the load slope is:
The recommended value for R
maximum output voltage at AVP is 2.5V. Therefore, for
output higher than 2.5V, AVP function is not supported.
The DIFFP pin, however, should always be connected to the
output even when AVP or diffamp functions are not used.
Programmable Shed Mode
When the MODE pin is tied to INTV
shed mode. It means that the second and third channel will
stop switching when I
threshold. The threshold voltage on I
goes into shed mode, is programmed according to the
following formula:
The valid range of V
is the voltage on the ISET pin. There is a precision 7.5µA
flowing out of the ISET pin. Connecting a resistor to SGND
sets the V
will be at INTV
case will be 0.5V. There is a 50mV hysteresis for the shed
mode threshold comparator.

V

 
SHED
R
SENSE
= 0.5 + (5/3) • (0.5 – V
ISET
•
R
CC
voltage. When left floating, V
PRE-AVP
R
. The shed mode threshold voltage in this
AVP
ISET
TH

 
is between 0V to 0.5V and V
V A
is below a certain programmed
/
AVP
ISET
CC
is 90Ω to 100Ω. The
)
, the LTC3829 enters
TH
when LTC3829
ISET
voltage
ISET
Programmable Burst Mode Operation
When the MODE pin is floating, the LTC3829 enters Burst
Mode operation. This means that all channels will stop
switching when I
The Burst Mode clamp, which sets the current limit when
bursting, can be programmed through V
the following equation:
The valid range of V
is the voltage on the ISET pin. There is a precision 7.5µA
flowing out of ISET. Connecting a resistor to SGND sets
the V
will be at INTV
case will be 0.7V. There is a 50mV hysteresis for the Burst
Mode comparator.
Nonlinear Control Loop
The LTC3829 features a unique control loop that can speed
up transient response dramatically. This feature is enabled
and programmed through the IFAST pin. When IFAST is
tied to INTV
is the voltage that can be programmed on the IFAST pin.
There is a precision 10µA flowing out of the ISET pin. Con-
necting a resistor to SGND sets the V
V
sets the threshold voltage that triggers nonlinear control.
IFAST
V
CLAMP
ISET
is set below 0.5V, the difference of 0.5V and V
voltage. When left floating, the V
= 0.7 + 0.62 (0.5 – V
CC
, the nonlinear control loop is disabled. V
CC
TH
. The Burst Mode clamp voltage in this
ISET
is below a certain threshold.
is between 0.3V to 0.5V and V
ISET
)
IFAST
ISET
voltage. When
according to
ISET
voltage
IFAST
IFAST
ISET
3829f