MIC38300_10 Datasheet, PDF (3/12 Pages) Micrel Semiconductor – HELDO 3A High Efficiency Low Dropout Regulator

Micrel, Inc.
Pin Configuration
SWO 1
28 SW
SWO 2
27 SW
SWO 3
26 SW
SWO 4
25 SW
SWO ⁵
SW 6
24 _SW
23 SW
ePAD 7
22 ePAD
AVIN 8
21 PGND
LPF ⁹
20 PGND
AGND 10
FB ¹¹
19 PGND
18 EN
12 13 14 15 16 17
MIC38300
28-Pin 4mm x 6mm MLF^® (ML)
(Top View)
Pin Description
Pin Number
MIC38300HYHL
1, 2, 3, 4, 5
6, 23, 24, 25,
26, 27, 28
7, 22
8
9
10
11
12, 13
14, 15
16, 17
18
19, 20, 21
Pin Name
SWO
SW
ePAD
AVIN
LPF
AGND
FB
LDOOUT
LDOIN
PVIN
EN
PGND
Pin Name
Switch (Output): This is the output of the PFM Switcher.
Switch Node: Attach external resistor from LPF to increase hysteretic
frequency.
Exposed heat-sink pad. Connect externally to PGND.
Analog Supply Voltage: Supply for the analog control circuitry. Requires
bypass capacitor to ground. Nominal bypass capacitor is 1µF.
Low Pass Filter: Attach external resistor from SW to increase hysteretic
frequency.
Analog Ground.
Feedback: Input to the error amplifier. Connect to the external resistor
divider network to set the output voltage.
LDO Output: Output of voltage regulator. Place capacitor to ground to
bypass the output voltage. Nominal bypass capacitor is 10µF.
LDO Input: Connect to SW output. Requires a bypass capacitor to ground.
Nominal bypass capacitor is 10µF.
Input Supply Voltage (Input): Requires bypass capacitor to GND. Nominal
bypass capacitor is 10µF.
Enable (Input): Logic low will shut down the device, reducing the quiescent
current to less than 50µA. This pin can also be used as an under-voltage
lockout function by connecting a resistor divider from EN/UVLO pin to VIN
and GND. It should be not left open.
Power Ground.
June 2010
3
M9999-061010-D