Low Input Voltage, High Efficiency, 2.5A Integrated
FET Synchronous Step down DC/DC Regulator
POWER MANAGEMENT
Description
The SC4620 is a highly integrated synchronous step-down
DC/DC regulator designed for low input voltage range of
2.3V to 5.5 Volts. It can deliver 2.5A continuous output
current with the output voltage as low as 0.5 Volts. The
internal low R
DS(ON)
synchronous power switches eliminate
the need for external Schottky diode while delivering
overall converter efficiency up to 95%.
A power good pin is available to monitor the output voltage
status. Operating frequency is adjustable from 200 kHz
to 2MHz with a single resistor and it can be synchronized
to an external clock.
The SC4620 offers adjustable current limit, soft start and
over temperature protection to safeguard the device under
extreme operating conditions. The soft start provides a
controlled output voltage ramp up at startup. When a
logic low is applied to the Enable pin, the SC4620 enters
the shutdown mode and it consumes less than 1µA of
current.
The SC4620 is available in 4x4 MLPQ-20 and it is rated
over -40°C to +85°C ambient temperature range.
SC4620
Features
VIN Range: 2.3 – 5.5V
2.5A Continuous Output Current
Adjustable Output Voltage 0.5V to Vin
Up to 95% Efficiency
Synchronizable and Programmable Frequency:
200kHz – 2MHz
Power Good Monitor
<1µA of Shutdown Current
Programmable Soft Start
Programmable Current Limit
Over Temperature protection
-40 to +85 °C Ambient Temperature Range
4X4mm MLPQ-20 packages- WEEE and RoHS
compliant
Applications
Low Voltage Distributed DC-DC Converters
Telecommunication Power Supplies
Portable Equipment
xDSL
Typical Application Circuit
5
4
3
2
1
R4
D
C11
L1
Vin
PVIN
R5
C9
R6
R2
C3
SYNC/EN
PGOOD
VCC
FB
PH
D
Vout
R7
R8
C8
C4
C
C
SC4620
SS
ISET
FS
R1
C2
R9
C1
B
B
COMP
AGND
C7
C5
R3 R11
A
PGND
A
5
4
3
2
1
Revision: July 10, 2008
1
www.semtech.com
SC4620
POWER MANAGEMENT
Pin Configuration
5
4
D
3
2
1
Ordering Information
D
Top View
Device
Top Mark
SC
4620
Package
MLPQ-20
PH
NC
NC
PH
PH
SC4620MLTRT
(1) (2)
SC4620EVB-MLPQ
PVIN
C
20
1
PVIN
ISET
16
15
Evaluation Board
PGND
SS
FS
T
5
6
11
10
PGND
FB
AGND
VCC
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices for MLPQ-20
C
package.
(2) Available in lead-free package only. Device is WEEE and RoHS compliant.
B
B
A
20Pin MLPQ
θ
JA
= 29°C/W;
θ
JC
= 2.5°C/W.
5
4
3
2
1
SYNC/EN
PGOOD
COMP
VCC
NC
A
2008 Semtech Corp.
2
www.semtech.com
SC4620
POWER MANAGEMENT
Absolute Maximum Ratings
Parameter
Supply Voltage
PVIN to VCC
FB, COMP, ISET, SYNC/EN, FS, SS, PGOOD to AGND
PGND to AGND
PHASE Voltage to PGND
PHASE Pulse Voltage to PGND Tpulse < 50ns
Storage Temperature Range
Junction Temperature
IR Reflow Temperature
ESD Protection Level
(1)
Note:
1) Tested in accordance to JEDEC standard JESD22-A114B.
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the
Electrical Characteristics section is not implied.
Symbol
PV
IN
, V
CC
Maximum
-0.3 to 6
+/- 0.3
-0.3 to VCC+ 0.3
+/- 0.3
Units
V
V
V
V
V
V
°C
°C
°C
kV
V
PHASE
V
PHASE
T
STG
T
J
T
P
V
ESD
-0.3 to PVIN+ 0.3
-3 to PVIN+ 2
-40 to 150
150
260
2
Recommended Operating Conditions
The Performance is not guarantied if exceeding the specifications below.
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Embedded System
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