LTC3704EMS Linear Technology, LTC3704EMS Datasheet - Page 21

• Manufacturer Part Number: LTC3704EMS
• Description: IC INV SYNC 5.2V 50MA 10MSOP
• Manufacturer: Linear Technology
• Type: Invertingr

Specifications of LTC3704EMS

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -5.2V
• Current - Output: 50mA
• Frequency - Switching: 50kHz ~ 1MHz
• Voltage - Input: 2.5 ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

APPLICATIO S I FOR ATIO
Assuming a maximum junction temperature of 125°C and
a forward voltage of approximately 0.33V at 3A (the
maximum output current at V
dissipate 1W at full load. The diode selected was the
MBRD835L from On Semiconductor, packaged in a
D-Pak.
P
D
= I
O(MAX)
100
90
80
70
60
50
40
30
20
0.001
Figure 16. Efficiency vs Output Current
• V
4.7nF
C
D2
C1
68.1k 1%
F
R
U
3k
R
750Ω
1nF
0.01
C1
C
R2
SS1
OUTPUT CURRENT (A)
Q1
V
IN
V
U
= 10V
IN
Figure 15. 5V to 15V Input, –5V Output at 2A-3A(5A Peak)
Positive-to-Negative Converter with Soft-Start and Undervoltage Lockout.
= 5V
0.1
V
IN
154k
IN
1%
R1
= 15V
100Ω
R
FET = Si4884
L = BH510-1009
V
FREQ = 300kHz
SS2
O
= 15V), this diode will
= –5V
R
80.6k
1%
W
1.21k
T
R
1
FB1
1%
1
2
3
4
5
3704 F16
RUN
I
NFB
FREQ
MODE/SYNC
TH
10nF
C
SS
10
LTC3704
3.65k
R
1%
FB2
U
INTV
SENSE
GATE
GND
V
CC
IN
C
C
C
C
IN
DC
OUT
VCC
10
: TDK C5750X5R1C476M
6
8
7
9
: TDK C5750X7R1C476M
: TDK C5750X5R0J107M
: TAIYO YUDEN LMK316BJ475ML
7. The DC coupling capacitor must be capable of handling
an RMS current of:
C
4.7μF
X5R
VCC
I
D PEAK
(
Figure 17. Maximum Output Current vs Input Voltage
C
47μF
X5R
L1*
M1
IN
)
6
5
4
3
2
1
0
=
•
5
–
47μF
C
X5R
I
D1
DC
O MAX
(
D1: ON SEMICONDUCTOR MBRD835L
D2: CDMSH-3
L1, L2: BH ELECTRONICS BH510-1009
M1: SILICONICS/VISHAY Si4884
Q1: MMBT3904
•
L2*
INPUT VOLTAGE (V)
)
•
3704 F15
1
10
–
D
D
MAX
C
100μF
X5R
(X2)
V
5V to 15V
MAX
V
–5.0V
2A to 3A
(5A PEAK)
GND
OUT
IN
OUT
=
3
3704 F17
A
LTC3704
15
21
3704fb