EV2104DJ-00A Просмотр технического описания (PDF) - Monolithic Power Systems
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EV2104DJ-00A Datasheet PDF : 10 Pages
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TM
MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin # Name Description
1
EN
Regulator Enable Control Input. Drive EN above 1.5V to turn on the MP2104. Drive EN below
0.3V to turn it off (shutdown current < 0.1µA).
2 GND Ground.
3 SW Power Switch Output. Inductor connection to drains of the internal PFET and NFET switches.
4
IN Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.
5
FB
Feedback Input (MP2104DJ). Connect FB to the center point of the external resistor divider. The
feedback threshold voltage is 0.6V.
5
OUT
Output Voltage Sense Input (MP2104DJ-1.5 and MP2104DJ-1.8). An internal resistor divider is
connected to this pin to set the proper output voltage.
OPERATION
The MP2104 is a constant frequency current
mode PWM step-down converter. The MP2104
is optimized for low voltage, Li-Ion battery
powered applications where high efficiency and
small size are critical. The MP2104 uses an
external resistor divider to set the output
voltage from 0.6V to 6V. The device integrates
both a main switch and a synchronous rectifier,
which provides high efficiency and eliminates
IN
an external Schottky diode. The MP2104 can
achieve 100% duty cycle. The duty cycle D of a
step-down converter is defined as:
D
=
TON
× fOSC
× 100%
≈
VOUT
VIN
× 100%
Where TON is the main switch on time, fOSC is
the oscillator frequency (1.7MHz), VOUT is the
output voltage and VIN is the input voltage.
BIAS
EN
&
VOLTAGE
REFERENCE
0.6V
ICS +
+
SLOPE COMP
PWM
+PWMCMP
FEEDBACK
ERROR EAMP
EAO
--
AMP
FB
--
+
IAMP
10X
CURRENT --
SENSE
AMP
DH
MAIN
SWITCH
(PCH)
CC
17pF
1.7MHz OSC
OSCILLATOR
PWM
CONTROL
LOGIC
SW
SYNCHRONOUS
RECTIFIER
(NCH)
DL
MP2104 Rev. 1.3
10/4/2005
Figure 1—Functional Block Diagram (MP2104)
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
GND
MP2104_BD01
6
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