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L6996 数据表(PDF) 4 Page - STMicroelectronics

部件名 L6996
功能描述  DINAMICALLY PROGRAMMABLE SYNCHRONOUS STEP DOWN CONTROLLER FOR MOBILE CPUs
PDF  26 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6996 数据表(HTML) 4 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS
(VCC = VDR = 5V; Tamb = 0°C to 70°C unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY SECTION
Vin
Input voltage range
Vout=1V Fsw=110Khz Iout=1A
1
28
V
Vcc, VDR
4.5
5.5
V
Vccoff
Turn-off voltage
4.1
4.3
V
VHYST
UVLO Hysteresys
60
90
100
mV
Iqcc
(VDR)
Quiescent current driver
VFB- > VFB+
20
µA
Iqcc
(Vcc)
Quiescent current
VFB- > VFB+
600
µA
SHUTDOWN SECTION
SHDN
SHDN Threshold
0.6
1.2
V
ISH
(VDR)
Driver quiescent current in
shutdown.
SHDN to GND
5
µA
ISH (Vcc) Shut down current
SHDN to GND
15
µA
SOFT START SECTION
ISS
SS charge current
4
6
µA
Soft-start active range
0.9
V
ON TIME
Ton
On time duration
Vprog=CS- =1.15 Osc=250mV
720
800
880
ns
Vprog=CS-=1.15 Osc=500mV
355
420
485
ns
Vprog=CS-=1.15 Osc=1V
210
250
290
ns
Vprog=CS-=1.15 Osc=2V
120
150
180
ns
OFF TIME
Minimum Off Time
580
ns
KOSC/TOFFMIN
OSC=250mV VPROG=CS-=1.15V
0.28
DAC
Vprog
Voltage Accuracy
VID0-4 see table 1
-1
+1
%
PWM COMPARATOR
Input voltage offset
VPROG=1.6V=VFB-
-2
+2
mV
IVFB-
Input bias current (VP)
VVFB- =1.6V
4
5
6
µA
CURRENT LIMIT AND ZERO CURRENT COMPARATOR
ILIM
ILIM input bias current
CS-=VPROG=1.6V
ILIM to GND = 120K
Ω
4.95
µA
KC
Positive and negative Current
Limit factor.
RILIM = 120 KΩ
0.18
0.3
0.24
µA
PHASE-
GND
Zero Crossing Comparator offset
-2
2
mV
GATE DRIVERS
High side rise time
VDR=5V; C=7nF
HGATE - PHASE from 2 to 4.5V
50
70
ns
High side fall time
50
70
ns
Low side rise time
50
70
ns
Low side fall time
50
70
ns
PROTECTIONS
OVP
Over voltage trip
CS- rising
117
120
123
%



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