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LT1307CS8 Datasheet(PDF) 15 Page - Linear Technology

Part # LT1307CS8
Description  Single Cell Micropower 600kHz PWM DC/DC Converters
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1307CS8 Datasheet(HTML) 15 Page - Linear Technology

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15
LT1307/LT1307B
TYPICAL APPLICATIONS N
Externally Controlled Burst Mode Operation
This circuit overcomes the limitation of load-based
transitioning between Burst Mode operation and constant
switching mode by adding external control. If M1’s gate is
grounded by an external open-drain signal, the converter
functions normally in constant switching mode, delivering
3.3V. Output noise is low, however efficiency at loads less
than 1mA is poor due to the 1mA supply current of the
LT1307B. If M1’s gate is allowed to float, the low-battery
detector now drives the VC pin. R3 and R2 set the output
to 3V by allowing M1’s gate to go to VOUT until the output
voltage drops below 3V. R1 adds hysteresis, resulting in
low-frequency Burst Mode operation ripple voltage at the
output. By pulling the VC pin below a VBE, quiescent
current of the LT1307B drops to 60
µA, resulting in accept-
able efficiency at loads in the 100
µA range.
VIN
VC
SW
FB
LBO
LBI
LT1307B
L1
10
µH
MBR0520
100k
2
CELLS
1nF
1
µF
CERAMIC
1307 F19
GND
SHDN
C2*
10
µF
CERAMIC
R3
698k
R4
1M
R2
499k
R5
590k
R1
10M
+
C1
100
µF
VOUT
3.3V
200mA
300k
VOUT
M1
2N7002
GROUND = HIGH POWER/LOW NOISE
FLOAT = Burst Mode OPERATION
SHUTDOWN
3.0V IN LOW-POWER
Burst Mode OPERATION
C1 =AVX TPSC107K006R0150
L1 = COILCRAFT DO1608-103
SUMIDA CD43-100
C2 OPTIONAL: REDUCES OUTPUT
RIPPLE CAUSED BY C1'S ESR
*
0.2s/DIV
1307 F20
This photo details output voltage as the circuit is switched
between the two modes. Load current is 100
µA in Burst
Mode operation; 10mA in constant switching mode.
This photo shows transient response in constant switch-
ing mode with a 10mA to 100mA stepped load. Output
ripple at the switching frequency can be reduced consid-
erably by adding a 10
µF ceramic capacitor in parallel with
the 100
µF tantalum.
10mA
100
µA
IL
VOUT
500mV/DIV
2ms/DIV
1307 F21
VOUT
100mV/DIV
100mA
10mA
IL



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