LM5642MH NSC [National Semiconductor], LM5642MH Datasheet - Page 5

• Manufacturer Part Number: LM5642MH
• Description: High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
• Manufacturer: NSC [National Semiconductor]

V
S
Gate Drive
I
I
I
I
R
R
Oscillator and Sync Controls
F
Don_max
T
SS
V
V
Error Amplifier
I
I
I
I
I
gm1, gm2
GI
GI
Voltage References and Linear Voltage Regulators
UVLO
CBOOT
SC_DRV
sk_HDRV
sk_LDRV
FB1
comp1_SC
comp2_SC
comp1_SK
comp2_SK
osc
on_min
OVP
wx_R
HS
LS
HDRV
LDRV
SNS1
SNS2
Symbol
OT_delta
, I
FB2
,
,
,
V
Shutdown Latch Threshold
SW1, SW2 ON-Resistance V
CBOOTx Leakage Current V
HDRVx and LDRVx Source
Current
HDRVx Sink Current
LDRVx Sink Current
HDRV1 & 2 Source On-
Resistance
HDRV1 & 2 Sink On-
Resistance
LDRV1 & 2 Source On-
Resistance
LDRV1 & 2 Sink On-
Resistance
Oscillator Frequency
Maximum On-Duty Cycle
Minimum On-Time
HDRV1 and HDRV2 Delta
On Time
SYNC Pin Min High Input
SYNC Pin Max Low Input
Feedback Input Bias
Current
COMP Output Source
Current
COMP Output Sink Current V
Transconductance
Current Sense Amplifier
(1&2) Gain
VLIN5 Under-voltage
Lockout
Threshold Rising
OUT
Overvoltage
Parameter
As a percentage measured at V
V
HDRVx=LDRVx=2.5V
V
= 2.5V
V
= 2.5V
V
V
V
V
V
5.5
5.5
V
HDRV1 and HDRV2
ON/SS1 = ON/SS2 = 2V
V
V
V
-20°C to 85°C
V
-20°C to 85°C
V
ON/SS1, ON/SS2 transition
from low to high
SW1
CBOOT1
CBOOT1
CBOOTx
CBOOTx
CBOOT1
SW1
CBOOT1
SW1
DD1
FB1
FB1_FIX
FB1_FIX
COMP1
FB1_FIX
COMP1
COMPx
≤
≤
= V
= V
= V
= V
= V
V
V
IN
IN
= V
= V
= 1.25V
FB2
= 1.5V, V
= V
= V
= VDDx = 5V, V
= VDDx = 5V, V
= V
= V
= V
= V
DD1
SW2
SW2
SW2
≤
≤
COMP2
COMP2
36V, LM5642
36V, LM5642X
FB2_FIX
FB2_FIX
CBOOT2
CBOOT2
CBOOT2
CBOOT2
= 1V, Measured at pins
= 5V
= 0.4V
= 0V
= 0V
Conditions
FB2_FIX
= 1V
= 0.5V
= 1V,
= 1.5V and
= 7V
= 5V, VSWx=0V,
= 5V,
= 5V,
5
SWx
SWx
= 1.5V
= 0V, HDRVX
= 0V, LDRVX
FB1
, V
FB2
Min
107
420
166
311
4.2
3.6
96
18
18
2
6
6
98.9
1.52
1.44
Typ
114
487
200
375
166
127
118
720
0.5
0.8
1.1
3.1
1.5
3.1
1.1
5.2
4.0
10
20
80
±200
Max
122
560
226
424
250
0.8
7.5
4.4
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Units
µmho
kHz
nA
nA
µA
µA
ns
ns
%
%
Ω
Ω
Ω
Ω
Ω
A
A
A
V
V
V