Document
Advanced Power
Electronics Corp.
APE8951
1.5A ULTRA LOW DROPOUT LINEAR REGULATOR
FEATURES
Ultra Low Dropout Voltage 250mV at 1.5A Output Current Low ESR Output Capacitor (MLCC) Applicable 0.8V Reference Voltage Fast Transient Response Current Limit and Thermal Shutdown Protection Adjustable Output Voltage by External Resistors Power-on-Reset Monitoring on Both VCNTL and VIN Pins Under Voltage Protection Power OK Output with a Delay Time Internal Soft-Start SOP-8 with Exposed Pad Package RoHS Compliant & Halogen Free
DESCRIPTION
The APE8951 is a 1.5A ultra low dropout linear regulator. The product is specifically designed to provide well supply voltage for front side bus termination on motherboard and NB applications. The IC needs two supply voltages, a voltage for the circuitry and a main supply voltage for power conversion, to reduce power dissipation and provide extremely low dropout. The APE8951 integrates many functions. A Power-on-Reset(POR) circuit monitors both supply voltage to prevent wrong operations. A thermal shutdown and current limit functions protect the device against thermal and current over-load. A POK indicates the output status with time delay which is set internally. It can control other converter for power sequence. The APE8951 can be enabled by other power system. Pulling and holding the EN pin below 0.4V shuts off the output.
The APE8951 is available in ESOP-8 package which features small size as SO-8 and exposed pad to reduce the junction-to-case resistance, being applicable in 2~3W applications.
TYPICAL APPLICATION
VCNTL=5V
C1 1uF
R3 1K
6 VCNTL
5 V IN
7 POK
8 EN
4 VOUT
APE8951
3 VOUT
1 G ND
2 FB
VIN=1.5V
C4 220uF
C3 0.1uF
R1 1K C6
12~48nF
R2 2K
V O UT=1 .2 V /1 .5 A
C4 220uF
C5 0.1uF
VCNTL=5V
C1 1uF
R3 1K
6 VCNTL
5 VIN
7 POK
8 EN
4 V O UT
APE8951
3 V O UT
1 GND
2 FB
VOUT=VFB x (1+R1/R2) VFB=0.8V
C2 22uF
V IN= 1 .5 V
R1 39K
R2 78K
V O UT=1 .2 V /1 .5 A
C4 56pF
C3 22uF
Figure 1. Output Capacitor with ESR > 20mΩ
Figure 2. Output Capacitor is MLCC
ORDERING INFORMATION
APE8951X - HF
Package Type MP : ESOP-8
Halogen Free
Data and specifications subject to change without notice
1 20100107D
Advanced Power Electronics Corp.
ABSOLUTE MAXIMUM RATINGS
VCNTL Supply Voltage(VCNTL) --------------------------- -0.3 to 7 V VIN Supply Voltage(VIN) ----------------------------------- -0.3 to 3.3 V EN and FB Pin Voltage ------------------------------------ -0.3 to VCNTL + 0.3V Power Good Voltage(VPOK) ------------------------------- -0.3 to 7 V Power Dissipation(PD) -------------------------------------- 3 W Storage Temperature Range(TST) ---------------------- -65°C To 150°C Junction Temperature Range(TJ) ----------------------- -25°C To 150°C Operating Temperature Range(TOP) ------------------- -20°C To + 85°C Thermal Resistance from Junction to Case(Rth JC) - 15°C/W Thermal Resistance from Junction to Ambient(RthJA) 40°C/W
APE8951
Note. Rth JA is measured with the PCB copper area(need connect to Exposed pad) of approx. 1.5 in 2 (multi-layers)
RECOMMENDED OPERATING CONDITIONS
VCNTL Supply Voltage(VCNTL) --------------------------- +3.1 to 6 V
VIN Supply Voltage(VIN) ----------------------------------- +1.1 to 3.3 V
Output Voltage(VOUT)
VCNTL=3.3V +0.8 to 1.2 V
VCNTL=5V
+0.8 to VIN-0.2 V
Output Current(IOUT) ---------------------------------------- +0 to 1.5 A
Junction Temperature Range(TJ) ----------------------- -25°C To 125°C
PACKAGE INFORMATION
ELECTRICAL SPECIFICATIONS
( VCNTL=5V, VIN=1.5V, VOUT=1.2V, TA=25oC, unless otherwise specified)
Parameter VCNTL POR Threshold VCNTL POR Hysteresis VIN POR Threshold VIN POR Hysteresis VCNTL Nominal Supply Current VCNTL Shutdown Current Feedback Voltage Load Regulation
Dropout Voltage
SYM
TEST CONDITION
MIN
VCNTL(PORTH)
2.7
VCNTL(hys)
-
VIN(PORTH) VIN(hys)
0.8 -
ICNTL
EN=VCNTL
0.4
ISD EN=0V
-
VFB VCNTL=3.3 ~ 5V
0.784
VDROP
IOUT = 0A ~ 1.5A IOUT = 1.5A, VCNTL=5V, TJ=25oC IOUT = 1.5A, VCNTL=5V, TJ=25~125oC
-
TYP 2.9 0.4 0.9 0.5 1 18 0.8 0.06 0.23
-
MAX UNITS 3.1 V
-V 1.0 V
-V 2 mA 30 uA 0.816 V 0.25 % 0.3 V 0.3 V
2
Advanced Power Electronics Corp.
ELECTRICAL SPECIFICATIONS(Cont.)
Soft Start Time EN Pin Logic High Threshold Voltage EN Hysteresis EN Pin Pull-Up Current Current Limit
Under Voltage Threshold POK Threshold Voltage for Power OK POK Threshold Voltage for Power Not OK POK Low Voltage POK Delay Time Thermal Thutdown Temp Thermal Thutdown Hysteresis
TSS VENH
Enable
IEN ILIM
VPOK VPNOK TDELAY
TSD
EN=GND VCNTL=3.3 ~ 5V, TJ=25oC VCNTL=3.3 ~ 5V, TJ=-25~125oC VFB Falling
VFB Rising
VFB Falling POK Sinks 5mA
PIN DESCRIPTIONS
PIN SYMBOL GND FB
PIN DESCRIPTION GND Pin Feedback Pin
VOUT
IC Power Supply Pin
EN H : Normal Operation ; L : Shutdown
POK
Power OK Output Pin
VCNTL
CNTL Pin Input Voltage
VIN Input Voltage
APE8951
-20.4 0.8 1.2
ms V
- 30 - 10 2 34 2-- 0.4 -
mV uA A A V
89% 92% 95% VFB
78% -
0.8 -
-
81% 0.25
2 150 50
84% 0.4 10
-
-
VFB V ms ºC ºC
BL.