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LM2621 Datasheet(PDF) 3 Page - Texas Instruments

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Part No. LM2621
Description  LM2621 Low Input Voltage, Step-Up DC-DC Converter
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM2621 Datasheet(HTML) 3 Page - Texas Instruments

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LM2621
www.ti.com
SNVS033C – MAY 2004 – REVISED MARCH 2005
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range of
−40°C to +85°C. Unless otherwise specified: VDD= VOUT= 3.3V.
Symbol
Parameter
Condition
Typ
Min
Max
Units
VIN_ST
Minimum Start-Up Supply Voltage(1)
ILOAD = 0mA
1.1
1.2
V
VIN_OP
Minimum Operating Supply Voltage
ILOAD = 0mA
0.65
V
(once started)
VFB
FB Pin Voltage
1.24
1.2028
1.2772
V
VOUT_M
Maximum Output Voltage
14
V
AX
VHYST
Hysteresis Voltage(2)
30
45
mV
η
Efficiency
VIN = 3.6V; VOUT = 5V; ILOAD = 500mA
87
%
VIN = 2.5V; VOUT = 3.3V; ILOAD = 200mA
87
D
Switch Duty Cycle
70
60
80
%
IDD
Operating Quiescent Current(3)
FB Pin > 1.3V; EN Pin at VDD
80
110
µA
ISD
Shutdown Quiescent Current(2)
VDD, BOOT and SW Pins at 5.0V;
0.01
2.5
µA
EN Pin <200mV
ICL
Switch Peak Current Limit
2.85
A
RDS_ON
MOSFET Switch On Resistance
0.17
Ω
Enable Section
VEN_LO
EN Pin Voltage Low(4)
0.15VDD
V
VEN_HI
EN Pin Voltage High(4)
0.7VDD
V
(1)
Output in regulation, VOUT = VOUT (NOMINAL) ± 5%
(2)
This is the total current into pins VDD, BOOT, SW and FREQ.
(3)
This is the current into the VDD pin.
(4)
When the EN pin is below VEN_LO, the regulator is shut down; when it is above VEN_HI, the regulator is operating.
PIN DESCRIPTION
Pin
Name
Function
1
PGND
Power Ground
2
EN
Active-Low Shutdown Input
3
FREQ
Frequency Adjust. An external resistor connected between this pin and Pin 6 (VDD) sets the switching
frequency of the LM2621.
4
FB
Output Voltage Feedback
5
SGND
Signal Ground
6
VDD
Power Supply for Internal Circuitry
7
BOOT
Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch
8
SW
Drain of the Internal MOSFET Power Switch
Copyright © 2004–2005, Texas Instruments Incorporated
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