XR76205EL-Q Datasheet, PDF (12/25 Pages) Exar Corporation – Power Management

Power Conversion (Continued)
Step-Up Regulators
Step-up regulators, also known as boost regulators, are used to step up an
input voltage to the desired higher output level. They are typically used in
portable equipment where the power supply is provided by a battery.
Applications
■■ _{Handheld and portable equipment}
■■ _{Bias supplies}
Part
Number
SP6641A
SP6660
SP6661
SP6648
SP6641B
SP34063
Output
Current
100mA
200mA
200mA
Operating
Voltage (V)
Min Max
0.9
4.5
1.5
4.25
1.5
5.3
2.5
5.3
Startup
Voltage Output
(V) Voltage
Output Voltage
Range (V)
Min Max
Quiescent
Current
(μA)
Efficiency
(%)
Fixed
3.3
0.85
Fixed
5
10
87
Inverter -4.25 -1.5
94
n/a
400
Doubler
3
8
96
Inverter
-5
-1.5
89
n/a
3mA
Doubler
5
10
94
400mA 0.7
4.5
0.85
Adj.
2.5
5.5
13
94
Fixed
3.3
500mA 0.9
4.5
0.85
Fixed
5
10
87
Adj. <1.5A 3
36
n/a
Adj.
1
27
4mA
80
Package Features
SOT23-5
SOIC-8
SOIC-8
MSOP-8
MSOP-10
SOT23-5
NSOIC-8
■■ _{Non synchronous}
■■ _{Enable pin}
■■ _{Current limiting}
■■ _{Charge pump topology}
■■ _{Selectable oscillator}
■■ _{External oscillator input}
■■ _{Charge pump topology}
■■ _{Selectable oscillator}
■■ _{External oscillator input}
■■ _Synchronous
■■ _{Enable pin}
■■ _{Programmable low battery detection}
■■ _{Undervoltage lockout protection}
■■ _{Non synchronous}
■■ _{Enable pin}
■■ _{Current limiting}
■■ _{Can be implemented in buck,}
boost or inverting topologies
Advanced DrMOS
This family of integrated power stages contains a synchronous buck gate
driver packaged with both half bridge MOSFETs. Also known as DrMOS
(Driver plus MOSFETs), this package design provides very low thermal
impedance and minimizes parasitic inductances resulting in excellent
EMI performance.
Applications
■■ _Servers
■■ _{Networking equipment}
■■ _{Industrial PC}
Part
Number
XR78021
V_IN
MIN
Iout (A) (V)
20A
4.5
V_IN V_OUT Minimum Switching
Efficiency (%)
Junction
MAX MAX On-Time Frequency [V_IN=12V, V_OUT = 1V, Temp Range
(V) (V)
(ns)
(kHz)
full load, 600kHz]
(°C)
Package Features
17
3.3
30
1500
84
-40 to 125
QFN
■■ _{UVLO, TMON, IMON}
12V
VR13
Controller
TSENSEx
PWMx
ISENSEx
REF
TOUT/FLT
SW
PWM
IOUT
XR78021
20A DrMOS
CS+
CS−
REFIN
PGND
5V
Vsense−
Vsense+
XR78021 Typical Application
12