Datasheet

LTC3226
6
3226f
TYPICAL PERFORMANCE CHARACTERISTICS
Charge Profile When Top
Capacitor = Bottom Capacitor
Charge Profile When Top
Capacitor < Bottom Capacitor
Charge Profile When Top
Capacitor > Bottom Capacitor
Normal-to-Back-Up Mode
Switching Transient Waveform
Leakage Balancer Source and
Sink Capability
VMID Shunt Regulator Voltage
vs Current and Temperature
Ideal Diode Gate Current
vs (V
IN
-V
OUT
)
VMID VOLTAGE (V)
0
VMID CURRENT (mA)
4
8
12
4
3226 G10
0
–4
2
6
10
–2
–6
–8
10.5
21.5
3 3.5 4.5
2.5
5
VMID
SOURCING
CURRENT
VMID
SINKING
CURRENT
90°C
25°C
–45°C
V
IN
= 3.3V, V
CPO
= 5V
VMID SHUNT REG OFF
VMID CURRENT (mA)
2.50
VMID VOLTAGE (V)
2.60
2.70
2.45
2.55
2.65
0.1 10 100 1000
3226 G11
2.40
1
90°C
25°C
–45°C
V
IN
= 3.3V
V
CPO
= 5V
ONLY LEAKAGE
BALANCER
ACTIVE
SHUNT
REGULATOR
ACTIVE
V
IN
– V
OUT
(mV)
–100
–5
I
GATE
(µA)
–4
–2
–1
0
5
2
–50
0
3226 G12
–3
3
4
1
50
100
FAST
OFF
FAST
ON
LINEAR
REGION
FORWARD
VOLTAGE
VOLTAGE (V)
3226 G13
TIME (5 SECONDS/DIV)
CPO
V
IN
V
MID
1x
MODE
2x
MODE
R
PROG
= 33.2k
C
SC
= 1.2F
6
5
4
3
2
1
–1
0
VOLTAGE (V)
3226 G14
TIME (5 SECONDS/DIV)
6
5
4
3
2
1
0
–1
V
IN
V
MID
1x
MODE
2x
MODE
R
PROG
= 33.2k, C
SC
= 1.2F
EXTRA 1.5F BETWEEN CPO
AND V
MID
CPO
V
MID
CLAMPED
(SHUNT ACTIVE)
VOLTAGE (V)
3226 G16
0 100 200 300 400 500
TIME (µs)
4
3
2
1
0
V
IN
V
OUT
PFO
(1V/DIV)
C
SC
= 1.2F
C
OUT
= 47µF
I
LOAD
= 2A
T
A
= 25°C, unless otherwise noted.
VOLTAGE (V)
3226 G15
TIME (5 SECONDS/DIV)
6
5
4
3
2
1
0
–1
V
IN
V
MID
1x
MODE
2x
MODE
R
PROG
= 33.2k,
C
SC
= 1.2F, EXTRA
1.5F BETWEEN
V
MID
AND GND
CPO
TOP CAP
CLAMPED