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| LTC3526L_15 Datasheet, PDF (7/16 Pages) Linear Technology – 550mA 1MHz Synchronous Step-Up DC/DC Converters | |||
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LTC3526L/LTC3526LB
Block Diagram
VIN
0.8V
TO 5V
CIN
2.2µF
L1
4.7µH
VOUT
3
VIN
VBEST
VB
VSEL
1
SW
ANTI-RING
4 SHDN
4M
SHUTDOWN SHUTDOWN
VREF
UVLO
VREF
START-UP
1MHz
CLK
OSC
GATE DRIVERS
AND
ANTI-CROSS
CONDUCTION
LOGIC
IPK
COMP
IPK
IZERO
MODE
CONTROL
THERMAL
TSD
SHUTDOWN
WAKE
EXPOSED
PAD
GND
7
2
WELL
SWITCH
VOUT 6
â+
IZERO
COMP
SLOPE
COMP
FB
5
ERROR AMP
SLEEP COMP
VREF
CLAMP
CSS
3526l BD
VOUT
1.5V
TO 5.25V
R2
COUT
4.7µF
R1
Operation (Refer to Block Diagram)
The LTC3526L/LTC3526LB are 1MHz synchronous boost
converters housed in a 6-lead 2mm à 2mm DFN package.
With a guaranteed ability to start up and operate from inputs
less than 0.8V, this device features fixed frequency, current
mode PWM control for exceptional line and load regula-
tion. 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-chan-
nel MOSFET switch and P-channel MOSFET synchronous
rectifier, the LTC3526L 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/LTC3526LB 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
3526lfc
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