HM3800S
BOOST CONVERT CONTROL IC
GENERAL DESCRIPTION
The HM3800 is a boost topology switching regulator control IC for ...
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
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
8
L
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 funct...
