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DC-DC Converter (Control) ICs [Step down]
DC-DC Converter (Control) ICs [Step down]
LV5803M
LV5803M
■ Applications
DC-DC converter
■ Functions/Features
● 2A 1-channel step-down switching regulator
● Wide input dynamic range (4.5 to 18V)
● High effi ciency
: 90% I OUT =1A, V IN =12V, V O =5V
● Compact package : MFP8
● Standby mode
● Overcurrent protection
● Thermal shutdown
● Fixed frequency
: 330kHz
● Reference voltage : 0.8V
● Soft start function
Type
Input voltage Output voltage Channels
Programmable
Step down
4.5V to 18V
1ch
externally
Current sense
UVLO
R10=4.3kΩ
OSC
Error Amp
330kHz
R1=27kΩ
FB
R3=10kΩ
COMP
R2=10kΩ
C4=OPEN
C3=1500pF
Internal stable
supply
SS
C6=0.015μF
Internal
Vref
TSD
regulator
0.8V
EN
open or H: ON
L:OFF
13
unit: mm
5.0
8
5
1
4
(0.65)
1.27
0.35
0.15
SANYO: MFP8(225mil)
Power stages
Package
Built in
MFP8(225mil)
Block Diagram
BOOT(SW+Vreg.)
BOOT
C2=10μF/25V
Amp
Rb=39
Pre-drive
C1=0.022μF
1:N
L1=10μH
SW
PWM
comparator
C5=10μF/
D1=SBM30-03
10V X 3
GND
Short
BOOT
SW
protect
circuit
COMP
• C1, C8, C5 = Ceramic capacitor used.
V IN
Short
• L1 = CDRH105RNP-100NC (sumida made)
protect
circuit
Internal regulator
(5V)
DC-DC Converter (Control) ICs [Separately-excited step-down]
DC-DC Converter (Control) ICs [Separately-excited step-down]
TN8D41A/51A, TN5D41A/51A/61A
TN8D41A/51A, TN5D41A/51A/61A
■ Applications
Separately-excited step-down switching regulator
■ Functions/Features
● Large current : I O max 8A (TN8D41A/51A)
● High effi ciency : Vertical-type P-channel power MOSFET built-in
● High withstand voltage : V IN max 57V
● Five external parts
● Built-in reference oscillator (150kHz)
● Built-in current limiter
● Built-in thermal shutdown circuit
● Built-in soft start circuit
● ON/OFF function (shared with soft start pin)
Type
10V to 40V (TN8D41A/TN5D41A)
Step
20V to 48V (TN8D51A/TN5D51A)
down
30V to 48V (TN5D61A)
V IN =12V
C8=10μF/25V
V IN
V OUT =3.3V
+
GND
GND
unit: mm
: I O max 5A (TN5D41A/51A/61A)
Input voltage
Output voltage
5V/5A (TN5D41A),
5V/8A (TN8D41A),
12V/5A (TN5D51A), 12V/8A (TN8D51A),
24V/5A (TN5D61A)
V IN
1
Over
Under Voltage
Over Current
Temperature
Protect
Protect
Protect
OUTPUT
--
OSC
COMP
SS
5
SOFTSTART
+
Band Gap
+
AMP
--
2
10.0
4.5
3.2
2.8
2.4
0.9
0.5
1
2 3
5
4
1.27
0.7
2.54
3.81
2.75
1.27
2.54
SANYO: TO-220FI5H-HB
Channels Power stages
Package
Built in
1ch
TO-220FI5H-HB
(PMOS)
Block Diagram
SW OUT
3
V OUT
SENSE
Pch MOSFET
FB
4
+
GND
14
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