 English |
|
|
|
|
|
|
|
| LTC3526L-2_15 Datasheet, PDF (7/16 Pages) Linear Technology – 550mA 2MHz Synchronous Step-Up DC/DC Converters | |||
| |||
| ◁ |
LTC3526L-2/LTC3526LB-2
Block Diagram
VIN
0.8V
TO 5V
CIN
2.2µF
4 SHDN
4M
L1
2.2µH
VOUT
3
VIN
1
SW
VBEST
VB
VSEL
WELL
SWITCH
ANTI-RING
VOUT 6
SHUTDOWN SHUTDOWN
VREF
UVLO
VREF
START-UP
2MHz
CLK
OSC
GATE DRIVERS
AND
ANTI-CROSS
CONDUCTION
IPK
COMP
IPK
â+
IZERO
3
COMP
SLOPE
COMP
LOGIC
IZERO
MODE
CONTROL
ERROR AMP
SLEEP COMP
VREF
FB
5
CLAMP
THERMAL
TSD
WAKE
SHUTDOWN
CSS
EXPOSED
PAD
GND
7
2
3526lb2 BD
VOUT
1.5V
TO 5.25V
R2
COUT
4.7µF
R1
Operation (Refer to Block Diagram)
The LTC3526L-2/LTC3526LB-2 are 2MHz synchronous
boost converters housed in a 6-lead 2mm à 2mm DFN
package. With a guaranteed ability to start up and oper-
ate from inputs less than 0.8V, this device features fixed
frequency, current mode PWM control for exceptional line
and load regulation. The current mode architecture with
adaptive slope compensation provides excellent transient
load response, requiring minimal output filtering. Internal
soft-start and internal loop compensation simplifies the
design process while minimizing the number of external
components.
With its low RDS(ON) and low gate charge internal N-channel
MOSFET switch and P-channel MOSFET synchronous recti-
fier, the LTC3526L-2 achieves high efficiency over a wide
range of load currents. Burst Mode operation maintains
high efficiency at very light loads, reducing the quiescent
current to just 9µA. Operation can be best understood by
referring to the Block Diagram.
Low Voltage Start-Up
The LTC3526L-2/LTC3526LB-2 include an independent
start-up oscillator designed to start up at an input voltage
of 0.68V (typical). Soft-start and inrush current limiting
are provided during start-up, as well as normal mode.
When either VIN or VOUT exceeds 1.3V typical, the IC
enters normal operating mode. When the output voltage
3526lb2fa
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese