LTC3422 Просмотр технического описания (PDF) - Linear Technology
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LTC3422 Datasheet PDF : 16 Pages
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BLOCK DIAGRA
VIN
1V TO 4.5V +
CIN
10µF
5
SHDN
2
VIN
SHUTDOWN
AND
VBIAS
SHDN
L1
4.7µH
ANTIRING
PWM
LOGIC
AND
DRIVERS
OPTIONAL
1
SW
BULK
VIN CONTROL
CURRENT
SIGNALS
SENSE
CURRENT
SENSE
IZERO
COMP
LTC3422
VOUT
10
VOUT
2.25V TO 5.25
BURST SLEEP
BURST
COMP
PWM
– CO+MP –
BURST
MODE
CONTROL
AWAKEN
COMP
0.88V
REFERENCE
THERMAL
SHUTDOWN
1.216V
0.88V
gm ERROR
–2%
AMPLIFIER
FB
6
+
Σ
+
SLOPE
COMPENSATION
IMAX
COMP
EXPOSED
PAD
11
OSCILLATOR
RT
8
RT
28k
SYNC
9
1.5A
START-UP
CURRENT
RAMP
1.216V
VC
7
START-UP
SOFT-START
AND
THERMAL
REG
BURST
3
RB
301k
CB
2.2nF
SS
4
CSS
0.1µF
3422 BD
R1
COUT
22µF
R2
CC1
1nF
RZ
15k
CC2
22pF
U
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
3422fa
7
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