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H&M Semiconductor

HM3800S Datasheet Preview

HM3800S Datasheet

BOOST CONVERT CONTROLLER

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HM3800S
BOOST CONVERT CONTROL IC
GENERAL DESCRIPTION
The HM3800 is a boost topology switching regulator control IC for battery-used applications
field. The HM3800 includes a totem-pole single output stage for driving NPN transistor or
N-MOS, high precision reference (0.5V) for comparing output voltage with feedback amplifier,
an internal dead-time control for controlling the minimum duty cycle, programmable soft start
with short circuit protection function and logic level control for operating mode or standby
mode.
FEATURES
˙Wide supply voltage operating range: 1.8 to 15V
˙Reference voltage precision: 4%
˙Low current consumption: Operation Mode 5.5mA
Standby-by Mode 1μA
˙High speed oscillator frequency: 1MHz max.
˙Programmable Soft Start function (SS)
˙Short Circuit Protection function(SCP)
˙Totem-pole output with adjustable on/off current
(for NPN transistors or n-channel MOSFET)
˙Logic level control stand-by mode function
˙Package: SOP8/TSSOP8/MSOP8/SOP8(EP)
SOP8
TSSOP 8
TYPICAL APPLICATION
˙Digital Camera
˙PDA
˙Portable Equipment
MS OP 8
1




H&M Semiconductor

HM3800S Datasheet Preview

HM3800S Datasheet

BOOST CONVERT CONTROLLER

No Preview Available !

FUNCTIONAL BLOCK DIAGRAM
3
7
HM3800S
Reference
voltage supply
1.25V
0.8V
0.1V
Sawtooth wave
oscillator
0.1V
PWM
1
36kΩ
+
Error Amp.
Comp.
+
+
+
Output drive
control circuit
0.5V
500KΩ
DTC 0.6V
0.22V
8
Soft start &
SCP circuit
6
2
4
5
30kΩ
MARK VIEW
1
2
3
4
PIN DESCRIPTION
Name No. I/O
Description
FB 1 I Error amplifier inverting input pin
8
SCP 2
I
Connected a capacitor
Soft start and SCP function pin
7
VCC 3 P IC power supply
BR/CTL 4 I Output current setting and control pin
6
OUT 5 O Totem-pole output
5
GND 6
OSC 7
P IC ground
I
Capacitor and resistor connected for
the frequency of oscillation
COMP 8 O Error amplifier compensation output
2


Part Number HM3800S
Description BOOST CONVERT CONTROLLER
Maker H&M Semiconductor
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HM3800S Datasheet PDF






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