MIC2182 Datasheet, PDF (9/28 Pages) Micrel Semiconductor – High-Efficiency Synchronous Buck Controller Final Information

MIC2182
Micrel
EN/UVLO
6
SS
1
PWM
2
Control
Logic
V_DD
Reference _VIN
Current
Limit
V_IN
C_IN
VDD
11
VIN
10
4.7µF
D2
VBST
14
HSD
C_BST
16
Q2
VSW
L1
R_CS
15
LSD
13
D1
Q1
PGND
12
V_OUT
C_OUT
PWM Mode
to Skip
Mode
0.024V
Skip-Mode
Current
Limit
0.07V
Low
Comp
–2%VBG
Hysteresis
Comp
PWM
RESET
CORRECTIVE
RAMP
SYNC
5
Oscillator
COMP
3
C_COMP
R_COMP
MIC2182-x.x
Current
Sense
Amp
Error
Amp
100k
A_V = 2
G_m = 0.2×10^-3
R1*
R2
50k
CSH
8
VOUT
9
SGND
4
VREF
7
* 82.5k for 3.3V Output
150k for 5V Output
Figure 2b. Fixed Output Voltage Versions
June 2000
9
MIC2182