SC4524SETRT Semtech, SC4524SETRT Datasheet - Page 13

• Manufacturer Part Number: SC4524SETRT
• Description: IC STEP-DWN SW REG 2A 30V 8-SOIC
• Manufacturer: Semtech
• Type: Step-Down (Buck)r

Specifications of SC4524SETRT

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Current - Output: 2A
• Frequency - Switching: 1.4MHz
• Voltage - Input: 2.8 ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Power - Output: -
• Other names: SC4524SETR

cycle is
If
the output capacitor will still be
due to base charge per cycle is
POWER MANAGEMENT
Applications Information
2006 Semtech Corp.
D
BST
is tied to the output, then the charge drawn from
I
SW
VIN
VIN
V
b
IN
T
ON
DBST
MAX V
for a power loss of
IN
IN
+ VZ -
DZ
SC4524
SC4524
BST
BST
BST
GND
GND
=
V
IN
MAX V
+
SW
SW
V
(a)
(c)
OUT
BST
I
I
SW
SW
Figure 7. Methods of Bootstrapping the SC4524.
=
b
T
V
2V
ON
OUT
b
D RECT
D
DI
IN
RECT
VS > VIN + 2.5V
. The energy loss
-
T
CBST
CBST
SW
V
b
ON
DBST
Z
V
VIN
IN
for a power
»
I
SW
VOUT
VOUT
b
V
DBST
OUT
IN
SC4524
.
13
(d)
BST
GND
MAX V
loss of
Since V
>2.5V) to maximize efficiency. In general efficiency
penalty increases as D decreases.
Figure 7 summarizes various ways of bootstrapping the
SC4524. A fast switching PN diode (such as 1N4148 or
SW
BST
VS > 2.5V
VIN
VIN
=
V
DI
OUT
S
SW
< V
b
V
D RECT
OUT
DBST
DBST
IN
IN
IN
, D
.
SC4524
SC4524
BST
GND
BST
BST
GND
MAX V
should always be tied to V
(b)
MAX V
(d)
SW
SW
VOUT
BST
=
BST
2V
=
IN
V
IN
D RECT
D
+ V
RECT
CBST
CBST
S
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SC4524
VOUT
VOUT
OUT
(if