NX2139ACMTR MICROSEMI [Microsemi Corporation], NX2139ACMTR Datasheet - Page 6

• Manufacturer Part Number: NX2139ACMTR
• Description: SINGLE CHANNEL MOBILE PWM AND LDO CONTROLLER
• Manufacturer: MICROSEMI [Microsemi Corporation]

BLOCK DIAGRAM
Rev. 2.3
03/19/09
GND(17 PAD)
VIN
ENLDO(14)
ENSW
/MODE(15)
LDOPG(5)
PGOOD(4)
VOUT
VCC(2)
TON(16)
FB(3)
VOUT
VCC
soft start
1M
LDO_EN
1M
VREF=0.75V
ON time
genearation
pulse
OCP_COMP
Bias
OVP
LDO_POR
start
LDOFBUVLO_latch
SELECTION
MODE
Figure 2 - Simplified block diagram of the NX2139A
LDOFBUVLO_latch
4.3/4.1
FBUVLO_latch
SS_finished
LDOSS_finished
POR
FBUVLO_latch
Disable
PFM_nonultrasonic
Mini offtime
400ns
1.25*Vref/0.7VREF
Sync
Thermal
shutdown
R
S
Disable_B
FB
Q
soft
start
0.9*Vref
0.9*Vref
start
0.7*Vref
OCP_COMP
HD
0.7*Vref
POR
Diode
emulation
ODB
HD_IN
FET Driver
start
FB
VOUT
HD
PGND
LDODRV(7)
SW(11)
OCSET(10)
LDRV(8)
LDOFB(6)
VOUT(1)
BST(13)
PVCC(9)
HDRV(12)
5V
NX2139A
1.5V@2A~5A
VIN
1.8V
6