MIC2182 Datasheet, PDF (8/28 Pages) Micrel Semiconductor – High-Efficiency Synchronous Buck Controller Final Information

MIC2182
Block Diagrams
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 [adj.]
Error
Amp
100k
Current
Sense
Amp
A_V = 2
G_m = 0.2×10^-3
CSH
8
VOUT
9
R1
FB
7
R2
SGND
4
V_OUT = 1.245V ^{}1+ _RR21^{}
V_OUT(max) = 6.0V
Figure 2a. Adjustable Output Voltage Version
MIC2182
8
June 2000