A8740EEETR-T Allegro Microsystems Inc, A8740EEETR-T Datasheet - Page 4

• Manufacturer Part Number: A8740EEETR-T
• Description: Photoflash Capacitor Charger
• Manufacturer: Allegro Microsystems Inc
• Series: -r

Specifications of A8740EEETR-T

• Constant Current: -
• Constant Voltage: -
• Topology: Flyback
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Flash/Torch
• Type - Secondary: -
• Frequency: -
• Voltage - Supply: 1.5 V ~ 5.5 V
• Voltage - Output: -
• Mounting Type: *
• Package / Case: *
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

A8740
ELECTRICAL CHARACTERISTICS
guaranteed from −40°C to 85°C ambient, unless otherwise noted
VBAT Voltage Range
VIN_DRV Voltage Range
UVLO Enable Threshold
UVLO Hysteresis
V
VBAT Pin Supply Current
Current Limit
Primary-Side Current Limit
Switch On-Resistance
Switch Leakage Current
CHARGE Pull-down Resistance
CHARGE Input Voltage
CHARGE On/Off Delay
Switch-Off Timeout
Switch-On Timeout
Output Comparator Trip Voltage
Output Comparator Voltage Overdrive
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ Output Leakage Current
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ Output Low Voltage
dV/dt Threshold for ZVS Comparator
IGBT Driver
TRIG Input Voltage
TRIG Pull-Down Resistor
GATE Resistance to VIN_DRV
GATE Resistance to GND
Propagation Delay (Rising)
Propagation Delay (Falling)
Output Rise Time
Output Fall Time
GATE Pull-Down Resistor
1
2
3
4
5
Specifications throughout the range T
Current limit guaranteed by design and correlation to static test.
Specifications throughout the range T
Guaranteed by design and characterization.
See IGBT Drive Timing Definition diagram for further information.
IN
Supply Current
Characteristics
4,5
4,5
1
1
1
1
1
2
4,5
1
4,5
3
1
A
A
= –40°C to 85°C guaranteed by design and characterization.
= –20°C to 85°C guaranteed by design and characterization.
Typical values are valid at V
R
R
V
R
V
V
Ultra Small Mobile Phone Xenon Photoflash
Symbol
V
R
R
I
V
V
V
t
t
SnkDS(on)
INUV(hys)
I
SWDS(on)
DONELK
SrcDS(on)
R
OUTTRIP
V
CHARGE
off(max)
on(max)
I
dV/dt
SWLIM
TRIG(H)
TRIGPD
V
CHGPD
OUTOV
TRIG(L)
SWLK
DONEL
I
V
t
GTPD
INUV
BAT
t
I
t
CH
BAT
IN
Dr
Df
t
t
IN
r
f
V
Shutdown (CHARGE = 0 V, TRIG = 0 V)
Charging complete
Charging (CHARGE = V
Shutdown (CHARGE = 0 V, TRIG = 0 V)
Charging done (CHARGE = V
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ = 0 V)
Charging (CHARGE = V
V
V
High, over input supply range
Low, over input supply range
Time between CHARGE = 1 and charging
enabled
Measured as V
Pulse width = 200 ns (90% to 90%)
32 μA into ¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ pin
Measured at SW pin
Input = logic high, over input supply range
Input = logic low, over input supply range
V
V
Measurement taken at ¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ pin,
C
IN
IN_DRV
SW
GATE
GATE
L
= 6500 pF
rising
Capacitor Charger with IGBT Driver
= 5.5, over full temperature range
= 1.8 V
= 1.8 V
= 3.6 V, I
IN
= V
SW
D
BAT
Test Conditions
– V
= 600 mA, T
BAT
= 3.6 V; T
IN
IN
, TRIG = 0 V)
, TRIG = 0 V)
IN
A
,
= 25°C
A
= 25°C, except
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
indicates specifications
Min.
1.35
31.0
1.5
2.3
1.3
1.3
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Typ.
2.05
0.02
0.01
31.5
150
130
200
130
700
1.5
0.4
6.6
50
20
18
18
20
50
25
60
80
20
–
–
2
–
–
–
–
–
–
–
–
–
Max.
1.65
32.0
100
400
100
5.5
5.5
2.2
0.5
0.5
0.5
50
–
1
5
–
2
–
–
–
–
–
1
–
–
–
–
–
–
–
–
–
–
–
V/μs
Unit
mV
mA
mV
mV
kΩ
kΩ
μA
μA
μA
μA
μA
μA
μA
us
μs
μs
kΩ
ns
ns
ns
ns
V
V
V
Ω
V
V
V
V
Ω
Ω
A
V
4