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LTC3422 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC3422
Description  1.5A, 3MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3422 Datasheet(HTML) 7 Page - Linear Technology

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LTC3422
7
3422fa
BLOCK DIAGRA
Σ
+
BULK
CONTROL
SIGNALS
CURRENT
SENSE
ANTIRING
OPTIONAL
L1
4.7
µH
CURRENT
SENSE
IZERO
COMP
BURST
COMP
AWAKEN
COMP
gm ERROR
AMPLIFIER
PWM
COMP
PWM
LOGIC
AND
DRIVERS
BURST SLEEP
BURST
MODE
CONTROL
VIN
SW
1
RT
8
SYNC
RT
28k
9
BURST
3422 BD
3
SS
4
FB
6
VC
7
VOUT
VIN
10
EXPOSED
PAD
11
2
SHDN
CIN
10
µF
5
SHUTDOWN
AND
VBIAS
SHDN
0.88V
–
+
1.216V
1.5A
+
+
START-UP
CURRENT
RAMP
–2%
REFERENCE
THERMAL
SHUTDOWN
START-UP
SOFT-START
AND
THERMAL
REG
1.216V
0.88V
SLOPE
COMPENSATION
OSCILLATOR
IMAX
COMP
RB
301k
CB
2.2nF
CSS
0.1
µF
R1
COUT
22
µF
R2
RZ
15k
CC1
1nF
CC2
22pF
VOUT
2.25V TO 5.25
VIN
1V TO 4.5V
OPERATIO
LOW VOLTAGE START-UP
The LTC3422 includes an independent start-up oscillator
designed to start up at input voltages of 0.88V typical.
During start-up, the peak current limit is gradually
increased in conjunction with the soft-start ramp. Switch-
ing frequency is also internally controlled during start-up.
The device can start up under some load (see graph of
Start-Up Voltage versus Output Current). Soft-start and



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