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| LTC3704 Datasheet, PDF (21/28 Pages) Linear Technology – Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller | |||
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LTC3704
APPLICATIO S I FOR ATIO
PD = IO(MAX) ⢠VF
Assuming a maximum junction temperature of 125°C and
a forward voltage of approximately 0.33V at 3A (the
maximum output current at VIN = 15V), this diode will
dissipate 1W at full load. The diode selected was the
MBRD835L from On Semiconductor, packaged in a
D-Pak.
C1
1nF
R2
68.1k 1%
RC
3k
CC1
4.7nF
D2
Q1
RSS1
750â¦
R1
154k
1%
1
RUN
2
ITH
10
SENSE
9
VIN
LTC3704
3
8
NFB
INTVCC
4
7
FREQ
GATE
5
6
MODE/SYNC GND
RT
80.6k
1%
RFB1
1.21k
1%
RFB2
3.65k
1%
7. The DC coupling capacitor must be capable of handling
an RMS current of:
ID(PEAK) = âIO(MAX) â¢
DMAX = 3A
1â DMAX
â¢
L1*
L2*
VIN
5V to 15V
VOUT
â5.0V
2A to 3A
(5A PEAK)
CDC
M1 47µF
X5R
CVCC
4.7µF
X5R
D1
CIN
47µF
X5R
COUT
100µF
X5R
(X2)
3704 F15
GND
RSS2
100â¦
CSS
10nF
CIN: TDK C5750X5R1C476M
CDC : TDK C5750X7R1C476M
COUT: TDK C5750X5R0J107M
CVCC: TAIYO YUDEN LMK316BJ475ML
D1: ON SEMICONDUCTOR MBRD835L
D2: CDMSH-3
L1, L2: BH ELECTRONICS BH510-1009
M1: SILICONICS/VISHAY Si4884
Q1: MMBT3904
Figure 15. 5V to 15V Input, â5V Output at 2A-3A(5A Peak)
Positive-to-Negative Converter with Soft-Start and Undervoltage Lockout.
100
90
VIN = 5V
80
VIN = 15V
70
VIN = 10V
60
50
40
30
20
0.001
FET = Si4884
L = BH510-1009
VO = â5V
FREQ = 300kHz
0.01
0.1
1
10
OUTPUT CURRENT (A)
3704 F16
Figure 16. Efficiency vs Output Current
6
5
4
3
2
1
0
5
10
15
INPUT VOLTAGE (V)
3704 F17
Figure 17. Maximum Output Current vs Input Voltage
sn3704 3704fs
21
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