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LTC3704 Datasheet(PDF) 21 Page - Linear Technology

Part # LTC3704
Description  Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller
PDF  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3704 Datasheet(HTML) 21 Page - Linear Technology

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21
LTC3704
sn3704 3704fs
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.
7. The DC coupling capacitor must be capable of handling
an RMS current of:
II
D
D
A
D PEAK
O MAX
MAX
MAX
()
(
)
–•
–
==
1
3
Figure 15. 5V to 15V Input, –5V Output at 2A-3A(5A Peak)
Positive-to-Negative Converter with Soft-Start and Undervoltage Lockout.
Figure 16. Efficiency vs Output Current
Figure 17. Maximum Output Current vs Input Voltage
RUN
ITH
NFB
FREQ
MODE/SYNC
SENSE
VIN
INTVCC
GATE
GND
LTC3704
RT
80.6k
1%
R1
154k
1%
CVCC
4.7
µF
X5R
M1
CIN: TDK C5750X5R1C476M
CDC : TDK C5750X7R1C476M
COUT: TDK C5750X5R0J107M
CVCC: TAIYO YUDEN LMK316BJ475ML
D1
•
L1*
L2*
COUT
100
µF
X5R
(X2)
VIN
5V to 15V
VOUT
–5.0V
2A to 3A
(5A PEAK)
GND
D1: ON SEMICONDUCTOR MBRD835L
D2: CDMSH-3
L1, L2: BH ELECTRONICS BH510-1009
M1: SILICONICS/VISHAY Si4884
Q1: MMBT3904
RC
3k
CC1
4.7nF
CIN
47
µF
X5R
1
2
3
4
5
6
7
8
10
9
CDC
47
µF
X5R
3704 F15
R2
68.1k 1%
C1
1nF
RFB1
1.21k
1%
RFB2
3.65k
1%
Q1
D2
RSS2
100
Ω
CSS
10nF
RSS1
750
Ω
•
OUTPUT CURRENT (A)
0.001
0.1
10
100
90
80
70
60
50
40
30
20
3704 F16
0.01
1
VIN = 5V
VIN = 15V
VIN = 10V
FET = Si4884
L = BH510-1009
VO = –5V
FREQ = 300kHz
INPUT VOLTAGE (V)
510
6
5
4
3
2
1
0
3704 F17
15



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