LTC1960 Datasheet, PDF (10/24 Pages) Linear Technology – Dual Battery Charger/Selector with SPI Interface

LTC1960
BLOCK DIAGRA (LTC1960CG Pin Numbers Shown)
DCIN
CHARGE
PUMP
ON
GCH1 34
SCH1 33
GCH2 ₃₅
ON
SCH2 36
BAT1 3
BAT2 2
V_PLUS 1
V_CC 28
GND 16
DCIN 29
V_SET 13
V_CC
REGULATOR
BGATE
OSCILLATOR
LOW DROP
DETECT
T_ON
BOOST 31
TGATE 32
SW 30
V_CC
BGATE ₂₇
PGND 26
GB1I GB1O
98
GB2I GB2O
11 10
GDCI GDCO
76
SWB1
DRIVER
SWB2
DRIVER
SWDC
DRIVER
SHORT CIRCUIT
AC_PRESENT
100mV
5 SCP
100Ω
4 SCN
17 DCDIV
CSN
CHGMON
400k
SCN
0.86V
SELECTOR
CONTROLLER
1.19V
12 LOPWR
CHARGE
SPI
INTERFACE
11
11-BIT ∆Σ
VOLTAGE DAC
10-BIT ∆Σ
CURRENT DAC
0V
21 MOSI
20 MISO
19 SCK
18 SSB
15 I_SET
CSP-CSN
3kΩ
g_m = 1.4m
EA
0.8V ⁺
PWM
LOGIC
S
Q
R
CHARGE
3k
CA1
3k
g_m = 1.4m
CA2
0.8V
÷15 ^{BUFFERED ITH}
I_CMP
–+
23 CSP
22 CSN
I_REV
40mV
DCIN
CLP 24
100mV
+ ^{gm = 0.4m}
CL1
25
14
COMP1
I_TH
CLAMP
0.75V
CHGMON
1960 BD
TEST CIRCUIT A D TI I G DIAGRA
Test Circuit
V_REF
+
EA
–
V_SW
CHGMON
BAT1
BAT2
V_SET
I_TH
+
–
0.5V
1960 TC01
SSB
SCK
MOSI
MISO
SPI Timing Diagram
t_LD
t_CYC
t_SH
t_H
t_SL
t_su
BIT 7
t_A
t_V
SLAVE
BIT 7 OUT
BIT 0
t_HO
SLAVE
BIT 0 OUT
10
t_SSH
t_LG
t_dis
1960 TD01
1960fa